2016年12月12日星期一

Effect of High Alumina Cement on Refractory Castables

In order to obtain early high mechanical strength, ordinary refractory castable tend to have a higher proportion of cement content (10% to 15%, weight ratio), but this also resulted in a series of refractory castable performance decline, the reason is:
1, in order to complete the hydration of cement, mixing excess water (10% ~ 15%) caused by ceramic refractory castable porosity was high, the density decreased.
2, Calcium aluminate hydrate has strong dehydration and recrystallization effect in the middle temperature stage, destroying the structure of the hard spots in the castable, so that the strength of the castable refractory material in the middle temperature phase drops sharply.
3, cementitious binder will be more into the castable, leading to ceramicized refractory castable load softening temperature decreases, thermal shock stability performance deterioration. In view of the poor performance of ordinary refractory castable, the low cement insulating castable is effective to avoid the high temperature performance. The so-called low-cement refractory castables, the cement content of less than 8%, while less than 4% is called ultra-low cement refractory castable. In contrast, the ordinary refractory castable above mentioned shortcomings, are converted into low-cement castable materials advantage. Its structure is dense. Low porosity, high refractoriness, load softening temperature is high, high temperature strength, thermal shock stability. However, due to its low content of cement, resulting in a long condensation time, low early strength in winter and low temperature conditions, especially in the construction of negative. Therefore, in the masonry, to give full attention

Magnesia Alumina/Alumina Magnesia Carbon Brick---Refractory Brick---Refractory Material---Changxing Refractory

Magnesia Alumina/Alumina Magnesia Carbon Brick---Refractory Brick---Refractory Material---Changxing Refractory
Alumina Magnesia Carbon Bricks are used in Ladle Sidewall and Bottom impact areas.
Magnesia Alumina Carbon Brick, Alumina Magnesia Carbon Brick

Introduction:
Alumina Magnesia Carbon Bricks is made from high quality bauxite, corundum and fused magnesia. It is formulated with very high purity alumina and magnesia.

Advantages:
It has low thermal conductivity, good isolation ability, and appropriate residual expansion

Application:
Alumina Magnesia Carbon Bricks are used in Ladle Sidewall and Bottom impact areas.

Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.

Content source:
http://www.yilongrefractory.com/AllProductOneServlet?id1=1&id=4
E-mail:sales8@chinaelong.com

2016年12月9日星期五

Magnesia aluminum refractories is Basic Refractories

Magnesia alumina brick refractories of basic refractories:
Ladle steel industry is an important and indispensable equipment, as refractory ladle lining, several major changes. Used to be traditional by sintering of clay bricks and third class alumina brick, the refractory material shows poor chipping resistance and corrosion resistance during use, low life, an average of only 10 times, dried treatment can only reach about 20 times. With the development of steelmaking technology, refining the molten steel to improve the outer retaining ladle lining refractories requirements in the early years of the 20th century that is, once the application as a whole

Cast Mg-Al quality ladle lining material. This lining integrity, and significantly improve the service life, but there are baked ladle long time, there are more serious dregs phenomenon for medium and small mills no special equipment most circumstances, unpacking difficult. To compensate for this deficiency, then the successful application of aluminum-magnesia unfired brick. The lining brick building is easy to assemble, baking time is short and easy unpacking, but still easy to kill slag and chipping resistance is poor. On this basis, in order to overcome the problem of aluminum-magnesia unfired brick ladle lining easy cat slag around the corner late he has not developed the aluminum-magnesia carbon brick, replacing the aluminum-magnesia unfired brick. The material combines the properties of aluminum-magnesia material and carbonaceous material. The main advantages of aluminum-magnesia carbon brick does not have: no cracks between the blocks melt loss, has good resistance to thermal shock resistance and slag ability to overcome the structural steel and slag penetration flaking, significantly improved service life and so on. Because the article is not burning or low-temperature firing, save energy, reduce costs, economic efficiency is very obvious, it attracted people's attention.


China advised in the 20th century, it began with bauxite and magnesite (or light burned MgO) magnesia aluminate spinel raw materials research. In recent years, also carried out a series of studies preparation of magnesia spinel products combine technology, achieved a lot, but the performance has been excellent in high purity products suffer from a high degree of firing is very limited. Domestic activity spinel powder was used. The ultra-high temperature firing process overseas (1 850c) down to 1 660C. But for the average coal-fired furnace refractory general terms, it is still difficult to achieve. To this end, the domestic refractory experts and scholars made active magnesia aluminum gum as a binding agent, was studied with the active Mg-Al gum as binding agent and high-purity magnesia brick magnesia brick spinel combination of performance, the use of magnesia aluminum adhesive activity, both make excellent performance products fired at 1 550 ℃, such as the advanced products in firing ordinary refractory kiln plant in Shanghai possible.


Through active lime kiln back to actual production, research and development of magnesia aluminate spinel unfired brick. Use show, developed spinel unburned brick in the active lime kiln firing service life of more than one year. For a long time, directly from the dry combination of magnesia-chrome brick with excellent slag resistance and corrosion resistance, it is used in large alkaline rotary kiln Pu left. Currently the most widely used range of the steel industry, most of the largest refractory Mg - Al system is unshaped refractory, accounting for about 85% of the unshaped refractories of total production, it is widely used in the converter, ladle, iron package, furnace and blast, virtually all metallurgical thermal equipment.


Spinel has a high melting point, small thermal expansion, low thermal stress, thermal vibration stability, and it has a more stable chemical properties of alkaline slag has a strong resistance, aluminum-magnesia do not burn brick core point to be used, is one of the key substances to improve life. Due to the gradual maturity in recent years, synthetic spinel technology, the use of synthetic spinel materials directly produce good ladle brick as possible, so that it can significantly improve the properties.


Quality spinel is one of the key issues related to the inter-spinel bricks can achieve the proper effect. By introducing the screening laboratory tests and related information, the magnesia-rich spinel 20% to 30% of its corrosion resistance, structural spalling resistance and thermal shock properties are better. But ladle conditions are more factors in the production operation, the amount of added spinel requirements should be 30% to 40% is more reasonable. Therefore, in brick-making process, in addition to producing a good artificial spinel added, we must also note the addition of fused magnesia powder and alumina powder, so that the secondary spinel regenerated during use. Thereby improving bricks tomb of quality performance parts for the control of harmful impurities in particular low-melting material was Na20 and K2O content, the choice of raw materials need special attention exhausted.


Spinel (also known as spinel) has the formula MgO-Al2O3, containing Mg0 was 28.3%, Al2O3 71.7%. Spinel is only Mg0-Al2O3 binary system phase diagram of an intermediate compound, melting at 2 135 C.

Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.

2016年11月23日星期三

Changxing Refractory,Refractory Brick,Castable,Ladle Nozzle,Calcium Silicate,Silicon Carbide: Magnesia Carbon Brick--Refractory Brick---Changxin...

Changxing Refractory,Refractory Brick,Castable,Ladle Nozzle,Calcium Silicate,Silicon Carbide: Magnesia Carbon Brick--Refractory Brick---Changxin...: Magnesia Carbon Brick is widely used in Electric Arc Furnace sidewalls, converters, hotspots and coldspots, and ladle furnace slag lines. ...

Magnesia Carbon Brick--Refractory Brick---Changxing Refractory material

Magnesia Carbon Brick--Refractory Brick---Changxing Refractory material
Magnesia Carbon Brick is widely used in Electric Arc Furnace sidewalls, converters, hotspots and coldspots, and ladle furnace slag lines.Magnesia Carbon Brick is mainly used for electric furnace lining, which enjoys advantages including high temperature resistance strength, corrosion and spalling resistance. 
Magnesia Carbon Brick

Introduction:
Magnesia carbon brick series used for the electric furnace are made by adoption of fused magnetite, high-purity magnesium sand and graphite as principal raw material, through high-pressure molding and low-temperature treatment. This product is mainly used for electric furnace lining, which enjoys advantages including high temperature resistance strength, corrosion and spalling resistance. According to the smelting conditions and the kind of smelting steel, different brands magnesia carbon bricks are available. Magnesia-carbon bricks are resin bonded bricks containing high-purity fused and or sintered magnesia and flake graphite as their main ingredients.

Advantages:
It has excellent corrosion resistance together with good thermal shock properties. It offers good oxidation resistance due to use of high purity flake graphite.

Application:
It is widely used in Electric Arc Furnace sidewalls, converters, hotspots and coldspots, and ladle furnace slag lines.

Content source:
http://www.yilongrefractory.com/ProductServletOne?id1=1&id=1
E-mail:sales8@chinaelong.com

2016年11月18日星期五

Monoblock Stopper---used for purifying liquid steel---Changxing Refractory material

Monoblock Stopper---Changxing Refractory material
Monoblock Stopper---Changxing Refractory material
Monoblock Stopper

Introduction:
Changxing's stopper rods are made from alumina-carbon in isostatic presses with zirconia inserts and/or magnesia tips as necessary for optimum performance. Argon channels are likewise available to suit a particular operation. Stopper rods are all X-rayed before shipment to eliminate flaws and cracks. Stopper rods can be supplied bare or with mounting hardware as required.

Advantages:
1. Stopper is used to control the flow of steel through the Tundish Nozzle. It is made of Magnesia Carbon or Alumina Carbon quality with special compositions at the tip and slag zone to suit customer requirements. Cross pin or screw fastening or gas purging facilities are provided as and when required. 2. For high performance applications, a range of special mixes are available for the stopper head or the slag line, each composition is custom formulated for the particular steel composition or casting conditions

Application:
This product enjoys performances of purifying liquid steel, prevent liquid steel oxidation, with good liquid steel washing resistance and erosion resistance.

Content source:
http://www.yilongrefractory.com/ProductServletOne?id1=4&id=57
E-mail:sales8@chinaelong.com

2016年11月8日星期二

Tundish Slag Dam---Changxing Refractory Material

Tundish Slag Dam---Changxing Refractory Material
Tundish Slag Dam

Introduction:
The products are characterized by their high strength, good resistance to carrion and thermal shock and long service life. It can be effectively stabilization molten steel enter to mould, promote non-metallic inclusions in molten steel float, and improve the quality of steel.

Advantages:
slag weir are characterized by their high strength, good resistance to corrosion and erosion; they can effectively stabilize molten steel, promote non-metallic inclusions separation, and improve the steel quality.

Application:
It has good corrosion resistance,anti-erosion properties and long service life.

Content source:
http://www.yilongrefractory.com/ProductServletOne?id1=4&id=55
E-mail:sales8@chinaelong.com

2016年11月7日星期一

Refractory bricks - High alumina bricks - Basic information

high insulating brick refractory than clay brick and semi-silica brick refractoriness should be high, up to 1750 ~ 1790 ℃, is a senior refractory
Al2O3 content of more than 90%, known as corundum brick. Because of different resources, national standards alumina brick are not entirely consistent. For example, European countries for high alumina refractory material Al2O3 content of the provisions of the lower limit of 42%. In China, according to alumina content in the high alumina brick is usually divided into three classes: Ⅰ and so on ─ ─ Al2O3 content> 75%; Ⅱ ─ ─ Al2O3 content of 60 ~ 75%; Ⅲ ─ ─ Al2O3 content of 48 ~ 60%.
Al2O3 in high alumina brick is close to neutral refractory and can resist the erosion of acid slag and alkaline slag. Because of containing SiO2, the ability of resisting alkali slag is weaker than that of acid resistant slag.
Alumina content of 48% or more of a neutral refractories material. From bauxite or other alumina content of the higher raw materials formed and calcined. High thermal stability, refractoriness above 1770 ℃. Slag resistance is good for masonry electric furnace, glass melting furnace, cement rotary furnace lining.
Mainly used for masonry blast furnace, hot stove, furnace top, blast furnace, reverberatory furnace, rotary kiln lining. In addition, high alumina brick is also widely used as open hearth lattice regenerative grid bricks, gating system with plug head, outlet brick. But the price of high-alumina brick clay brick than high, so with clay brick to meet the requirements of the place do not have to use high-alumina brick.

refractory company Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.

2016年11月1日星期二

Electric Furnace Prefabricated Part---Changxing Refractory material

Electric Furnace Prefabricated Part---Changxing Refractory material
Electric Furnace Prefabricated Part---Changxing Refractory material
Electric Furnace Prefabricated Part

Introduction and Advantages:

The essential thing with all prefab units is that their quality must be the same as the rest of the refractory structure. This demands innovative moulding techniques and strictly controlled use of monoliths, modern processing equipment and quality management and control. In their own two tunnel kilns and two batch kilns Gouda Refractories is also able to dry and fire the Prefab department's products at up to 1,680 degrees, so that a ceramic bond is created while baking.

Application:

In principle Prefab can satisfy any wish for refractory quality, shape, size, dimensional accuracy and finish.

Content source:
http://www.yilongrefractory.com/ProductServletOne?id1=4&id=52

2016年10月26日星期三

Submerged Entry Nozzle---Refractory Nozzle

Submerged Entry Nozzle
Submerged entry nozzle enjoys performances of purifying liquid steel, prevent liquid steel oxidation, with good liquid steel washing resistance and erosion resistance.
Submerged Entry Nozzle

Introduction

Changxing Refractory's submerged entry nozzle is isostatically pressed from alumina-graphite with zirconia inserts and magnesia seats as required. Argon channels are also available. These pieces are 100% X-ray tested for flaws and cracks prior to shipment. These submerged entry nozzles are engineered to provide maximum life at minimal cost.
Advantages

1. The Submerged Entry Nozzle (SEN) and Submerged Entry Shroud (SES) protect the steel flow from the Tundish to the mould.
2. Submerged Entry Nozzle is fixed inside the Tundish and also functions as a Tundish Nozzle. Submerged Entry Shroud on the other hand is fitted from the outside on the Tundish Nozzle.
3. The body is made of Alumina Carbon quality while the seat and slag zone are made of different qualities as per customer requirements including Zirconiz-Carbon and Magnesia Carbon quality.
4. The SEN and the SES are protected from the outside with a ceramic paper lining.
5. Submerged entry nozzle is served to protect and control the molten steel stream between the tundish and the mould during casting.
Application

Submerged entry nozzle enjoys performances of purifying liquid steel, prevent liquid steel oxidation, with good liquid steel washing resistance and erosion resistance.

Content source:
http://www.yilongrefractory.com/ProductServletOne?id1=3&id=51

2016年10月25日星期二

Performance and requirements of refractory materials for ladle

Ladle is to undertake the molten steel, continuous casting of the necessary equipment. Because many steel grades need to be refined in the ladle, including blast argon tempering, fine-grained alloy composition, powder refining and vacuum treatment, Ladle Permeable Brick lining working conditions worse and worse, the working environment is:

(1) The temperature of the molten steel is higher than that of the molded ladle.
(2) The residence time of the molten steel in the ladle is prolonged.
(3) Ladle liner itself volatilizes under high temperature vacuum and undergoes the stirring action of molten steel.
(4) lining to undertake the impact of the role of steel received.
(5) slag erosion of the lining.

Therefore, the requirements for ladle refractory are:
(1) high temperature, can withstand high temperature molten steel for a long time without melting softening.
(2) heat shock, can be repeated to withstand the installation of molten steel, without cracking peeling.
(3) resistance to slag erosion, can withstand slag and slag basicity changes on the erosion of the lining.
(4) has sufficient high temperature mechanical strength, can withstand the stirring and erosion of molten steel.
(5) lining has a certain expansion of the role of high-temperature molten steel, so close contact between the liner into a whole.

Refractory company Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.

2016年10月17日星期一

Refractory plastics for heating furnaces

Checker Brick
Furnace is used to bloom blanks, continuous casting billet, small steel ingot, slab heating to the required temperature of the thermal equipment.
The furnace body components of the furnace mainly include furnace top, furnace wall, furnace bottom, discharge end and feeding end, slope slipping, front wall brackets, slippery and curved slide rails, , The bottom of the water pipes, chute pipes, flues and chimneys, stove and steel structure and so on, in addition to a combustion device, air supply systems, heat exchangers, push steel and so on.

Furnace temperature is generally below 1400 ° C, for continuous and ring furnace, it can be divided into low temperature, medium temperature, high temperature, or preheating, heating and soaking section, the use of temperature Respectively, 800-900 ° C / 1150-1400 ° C / 1200-1300 ° C.

Refractory plastic is a longer time in a high plasticity was hard mud paste-like unshaped refractory material, it is a certain level of the refractory aggregate, fine powder, the right amount of binder, plasticizer, save Agent and water.
In recent years, China's large and medium-sized steel enterprises in the rolling mill furnace top, wall lining work on the overall use or part of the use of refractory plastic can provide the service life of the furnace, and achieved good economic returns.

Refractory company Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brickrefractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.

2016年10月12日星期三

The reasons of ladle upper nozzle damage and its reventive measures

Ladle nozzle is widely used in steel plant.
Ladle nozzle is widely used in steel plant.
1. The reasons of ladle upper nozzle damage
1) Under the scouring and erosion of liquid steel and steel slag, the slag erosion will occur under wrong operation process.
2) Mechanical damage during installation process.
2. To prevent the damages of sliding gate nozzle system, measures should be taken as below:
1) Use better raw material with high corrosion and erosion resistantance to make the upper nozzle, such as
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Article source:

2016年10月9日星期日

Analysis on Performance Requirement of Refractory material in Heat Treatment Furnace

Anchor Brick for Heating Furnace
The qualified of anchor brick is similar to the material of furnace lining castables and formed by preeing and being fired at high temperature. Characterized by good thermal shock resistance and high strength, it is used for several heating furnace and has good effect.
Refractory: Any material capable of resisting high temperatures and capable of withstanding high temperature physical and chemical effects.
Heat treatment furnace refractory material performance requirements:
1 has sufficient refractoriness. Refers to the refractory material after heating to a certain degree of softening temperature, but not its melting point.
According to the level of refractoriness, ladle refractory can be divided into ordinary refractories (refractory degree of 1580 ~ 1700 ℃), advanced refractories (refractory degree of 1770 ~ 2000 ℃) and special refractories (refractoriness greater than 2000 ℃).
2 has a certain high temperature structural strength. The structural strength at high temperature is evaluated by the softening point of the load, and the softening point of the load is the pattern
(The size of φ36 * 50mm) under a certain pressure (0.2MPa) conditions, a certain heating rate of heating, measured the sample began to deformation (deformation of the original sample 0.6%) temperature, the temperature is called refractory castable Of the load softening point starting point.
3 high temperature chemical stability.
4 has good resistance to abrupt heat.
5 volume stability at high temperatures.

2016年10月8日星期六

What are the general requirements for refractories material in electric arc furnaces

Henan Xinmi Changxing Refractory Material Co., Ltd.
General requirements of the refractory arc furnace:
① high refractoriness: arc temperature above 4000 ℃, steelmaking temperature often 1500 ~ 1750 ℃, sometimes as high as 2000 ℃, therefore, require refractories must have high refractoriness.
② high load softening temperature: EAF steelmaking process is under high temperature load conditions, and the furnace to withstand the erosion of molten steel, so the refractory material must have a high load softening temperature.
③ good thermal stability: EAF steel from the steel to the charge within a few minutes of rapid temperature changes, the temperature dropped from the original 1600 ℃ suddenly dropped to below 900 ℃, and therefore requires good thermal stability of refractories.
④ slag resistance is good: in the steelmaking process, slag, furnace gas, molten steel on the refractory company material has a strong chemical erosion effect, so the refractory should have good slag resistance.
⑤ high compressive strength: electric furnace lining in charge by the impact of the charge, the molten steel by the static pressure, tapping the steel by the scour when operating by mechanical vibration, so the refractory brick for sale must have a high pressure strength.
⑥ low thermal conductivity: In order to reduce the electric furnace heat loss, reduce power consumption, requiring the thermal conductivity of refractories to be poor, that is, the thermal conductivity is small.

2016年9月27日星期二

Measures to extend the life of the ladle refractory material

ladle refractory
In the normal production of steel, there are situations occur when the ladle gellan steel.Use good thermal conductivity refractory when lining-up may aggravate this phenomenon, combined with molten steel due to the temperature drop, which will create sticky residue lining the surface of serious problems within the ladle . Here Henan refractories plant was introduced to prolong the life of ladle magnesia carbon brick measures.
1. refractory brick for sale and masonry improve the way
In order to ensure that the masonry and flaking masonry lining less firmly connected properly changing the shape of the brick lining, made of shaped bricks to increase thermal stresses can be compensated by the number of vertical joints and bricks made of arc-shaped surface.Package wall spiral style method masonry, bricks can reduce consumption by more than 15%.
To prevent cracks between the blocks in LF ladle bottom lining erosion, Kobe Steel improved masonry structure. Concentric masonry package by the end of mullite corundum products, the central area (steel flow impact zone) with high alumina castable precast masonry block.This approach allows the masonry thinner than the central region surrounding the bottom half of the pack, lining life increased from 30 times 40 times, repair times reduced by two times 1 times.
Existing interface between the bricks can prevent crack propagation, interaction between the liner and the slag generated.Or between the safety liner and add a layer of tar dolomite working lining tar dolomite ramming material, or in use can be carbonized material.
2. Drying
(1) microwave heating
Microwave heating is a new thermal technology, compared with conventional heating, microwave heating without an external heat source, but the material is heated inside the microwave electromagnetic radiation, promote their movable particle motion, collide with each other so that friction heat. Monolithic refractories for ladle body construction using microwave heating, which greatly speeds up the reaction process, since the temperature difference between the surface and the interior of the small settlement burst release and tissue degradation phenomenon, the entire liner can be quickly heated and uniformly dense tissue . Heating time (conventional heating formerly required 24h) reduced to 8h.
(2) Quick baking apparatus
Anyang Iron and Steel Company second steel mill 25t ladle quick energy-saving baking apparatus using oxygen combustion, so that combustion gas can improve the thermal efficiency of over 50%.The practical production shows that it has a short baking time, adaptable, bake evenly, easy to operate, safe and reliable.Ladle down time from the past 40h 16h.Not only solves the gas pressure is low due to the impact Ladle problems, and effectively improve the baking quality of the ladle, to avoid the containment wall bricks crack phenomenon in the past due to the uneven baking caused.
(3) baking coal oxygen apparatus
Arm spin move or horizontal coal oxygen baking, preheat temperature in 1h refined package can reach 1000 - 1200 ℃. Effectively prevent slag line MgO-C, due to acute heat stress caused by thermal quench. Electric furnace refining temperature and time were decreased and shortened. Improve productivity and ladle life, reduce production costs and coordinate production order also plays a significant role.
3. Maintenance repair
Uneven ladle refractory lining is damaged, it is necessary to take repair, gunning and other measures to shore up weak links, to improve job ladle refractory consumption rate decreased, making the fullest use of the lining, to achieve the purpose of the high life.
Website:
http://www.yilongrefractory.com/AllProductServlet?id=1&number=20
E-mail:sales8@chinaelong.com

2016年9月20日星期二

Technical Innovation of Carbon Brick for Blast Furnace Hearths

Carbon Brick for Blast Furnace Hearths
Carbon Brick for Blast Furnace Hearths
Possessing with the excellent corrosion resistance and high thermal conductivity which can lead to easily form a protective layer for blast furnace hearth, refractory brick carbon bricks have been used as refractory material for hearths for more than half century.

To further improve its performance, the refractory experts have carried out many investigations recently. Finally, they find out some main reasons which caused the damage. They are including as below:
1) The penetration of molten iron into pores.
2) Erosion due to direct contact with molten iron (dis-solution by carburizing).
3) Embrittlement of the material on hot side (loss of cooling capacity).

In order to enhance its corrosion resistance, the experts have developed new technology to get new magnesia carbon brick through numerous experiments.
1) Add the aluminum oxide which has a good resistance to molten steel.
2) Reduce the pore diameter to prevent the penetration of molten steel and other impurity items.
3) Enhance the high thermal conductivity to reduce the surface temperature.
4) Add the TiC to improve the corrosion against molten steel, increase its viscosity and slow down the flow which could effectively reduce the damage on the MgO-C bricks.

Article sources:

http://www.yilongrefractory.com/news/Technical%20Innovation%20of%20Carbon%20Brick%20for%20Blast%20Furnace%20Hearths.html

2016年9月19日星期一

Generality High Alumina Brick &Clay Brick

Generality High Alumina Brick &Clay Brick

Generality High Alumina Brick &Clay Brick

Generality High Alumina Brick &Clay Brick

Introduction

Changxing Refractory's High Alumina Bricks and Fireclay range is available in different varieties/shapes as per the specifications given by the clients. We provide High Alumina Bricks that are highly resistant and durable without causing any environmental hazards maintaining High standards are made from a variety of raw materials having different properties. Shapes of the High Alumina Bricks are made as per the drawings and measurements provided by the clients and only high grade fireclay and raw materials are used in their manufacturing.
Advantages

It is used in lining furnace kilns, fireboxes and fireplaces. Its primary purpose is to withstand high temperature and also to retain the heat for greater energy efficiency. We offer wide range of low, medium & high alumina refractory firebricks. High alumina brick have very good ability of anti-acidity, anti-metal fluid corrode and anti-oxidation.
Application

High alumina brick have very good ability of anti-acidity, anti-metal fluid corrode and anti-oxidation.

Content Sources:
http://www.yilongrefractory.com/ProductServletOne?id1=1&id=13
E-mail:sales8@chinaelong.com

2016年9月6日星期二

The influences of raw material on magnesia carbon brick performance

http://www.yilongrefractory.com/ProductServletOne?id1=1&id=1
Magnesia carbon brick series used for the electric furnace are made by adoption of fused magnetite, high-purity magnesium sand and graphite as principal raw material, through high-pressure molding and low-temperature treatment. 
 magnesia carbon brick refractory alkaline oxide is magnesium oxide (melting point 2800 ℃) and difficult to infiltrate a high melting point slag carbon material as a raw material, adding a variety of non-oxide additives. Made in conjunction with carbonaceous binding agent is not charcoal refractory composites. MgO-C is mainly used for the converter, AC arc furnace, DC arc furnace lining, ladle slag lines and other parts.

MgO-C brick composite as a refractory material, the effective use of high thermal conductivity and strong resistance to slag erosion ability of magnesia and carbon and low expansion, the biggest drawback is compensated magnesia poor chipping resistance.

Its main features are:
1, has good high temperature performance
2, strong resistance to slag
3, good thermal shock resistance
4, low temperature creep

MgO-C material impact on performance

The main raw material for the production of magnesia carbon bricks properties, magnesia quality will have a crucial impact on the performance of MgO-C, magnesia how reasonable choice is the key to the production of MgO-C. There magnesia and fused magnesia sinter magnesia, which have different characteristics. Fused magnesia: grains, less impurities, less silicate phase, a high degree of direct bonding grain, less grain boundaries.

Sintered magnesia: fine grain impurities silicate phase relative called more directly the degree of integration is poor.

For magnesia raw materials, in addition to the chemical composition, in terms of organizational structure, also called high density and large crystal, therefore, as magnesia magnesia carbon bricks manufacturers
 produced raw material quality indicators used, the following should be investigated:

1, magnesium oxide content (purity)
2, the type of impurity, particularly .C / S and B2O3 content
3, magnesia density, pore size, pore morphology (sinterability).

Purity magnesia has a major influence on slag resistance of MgO-C. Magnesium oxide content is higher, relatively fewer impurities and reduce the degree of segmentation silicate phase, periclase directly bonded to improve the degree of melting loss resistance to slag penetration and slag increased. Magnesia in the juice mainly calcium oxide, silica, iron oxide, if the impurity content is high, especially compounds of boron oxide, magnesia refractoriness and high temperature will adversely affect the performance.

Magnesia of impurities separated at mainly affect several aspects of a periclase reduce the degree of direct bonding at a high temperature of magnesium oxide 2 forming a low-melting material 3 iron, silica and other impurities in the 1500-1800 ℃, the first magnesium oxide react with carbon, leaving pores so that slag resistance of the article deteriorates.

For magnesia raw materials, in addition to the total amount of impurities, the type of impurity and magnesia performance relative content team also have a significant impact. Which affect the CaO / SiO2 ratio and B2O3 content in the most obvious, the general magnesia refractories usually require CaO / SiO2≥2 MgO-C in order to improve the high temperature stability
Preparation of MgO-C materials mainly carbon flake graphite

2016年9月5日星期一

Recommendations active national green inorganic thermal insulation materials

Ceramic Fiber---insulation material
According to the shape can be divided into: a fibrous facing, slag wool, rock wool, glass wool, aluminum silicate wool, ceramic fiber, microporous pile diatomaceous earth, calcium silicate, perlite, expanded vermiculite, aerated concrete, foam glass bubble-like, volcanic ash glass, clay foam, foam concrete, the paste-like powder particles of polystyrene insulation slurry and the like.
 Refractories used in various fields of steel, nonferrous metals, glass, cement, ceramics, petrochemical, machinery, boilers, light industry, power, military and other national economy, is to ensure that these industries and technological development, production and operation of essential basic materials, It plays an irreplaceable role in the development of high-temperature industrial production.

YT insulation material is non-combustible Class A, is one for use in a variety of climates safe environment protection and energy class A fire insulation products. It is based on a natural high temperature lightweight materials as aggregate, stepless modified materials and nano-scale ultra-low thermal conductivity (0.013W / (mk)) material, a flexible material and gradual blending of principle, the use of advanced international It promises bonding and cracking technology, through factory production configuration, to provide a high-quality one-component finished; it becomes insulation, thermal insulation, fire, light, sound, water resistant, anti-cracking, hollowing anti-shedding and other properties as one of the environmentally friendly energy-saving wall insulation energy-saving products, winter can raise the indoor temperature 5-8 degrees in summer can reduce the indoor temperature 4-7 degrees, to meet national energy requirements.

Summarized in the following six performance advantages:

1, insulation energy saving effect - the fusion of ultra-low thermal conductivity of the material for the products to provide a guarantee of energy-saving;

2, security, fire protection, long life --A level non-combustible material. Products are of high quality inorganic polymeric material having the same properties and building the wall can be achieved with the construction body with life;

3, the construction is simple and quick: - shorten the construction period by more than half since the product is one component inorganic product, you need only product on the wall and water, stirring to operate without excessive technical requirements on construction, you can usually plasterers operation and does not require high technical requirements and plate type construction complex process, so the duration shorten the time;

4, resistant to water, acid, strong adaptability. Products and wall seamless connectivity, high stability, weather resistance; can avoid building air conditioning panels, window sills, floors and other parts along the leakage, easy to form hollowing cracking problem; while its strong adhesion and acid adding an alkaline material, make the body to keep building more complete surface layer will not appear moldy walls, chalking phenomenon;

5, good environmental performance and comfortable - with a certain permeability. Component products are able to remain active, flexible component, which itself has cool breathability, so the use of the product will not be room tightness, able to create a body feel relaxed and comfortable environment.

6, cost-effective superior - Construction products easy to operate, and its construction without primary treatment, also without mesh, rivets, cracking mortar and leveling putty and other processes, greatly reducing labor costs and material costs; and its Wall body with the characteristics of life, but also to avoid a repeat engineering insulation waste.

Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.

2016年9月1日星期四

Clay insulating bricks,refractory fiber board,ceramic fiber felt all are insulation material

clay insulating bricks
This brick with high strenght and thermal conductivity, which can be widely applied for different kiln as insulating layer.Size can be made according to requirements
Advantages of clay insulating brick
1,High strength at high temperature
2,Corrosion and spalling resistance
3,can be used both as building brick and insulating brick
4,According to smelting condition and the kind of smelting steel, different brands and shapes refractory bricks are available
2.refractory fiber board

Refractory Fiber Board
Application of refractory ceramic fiber board
1.Ceramic industry (kiln linings, kiln car insulation)
2.Glass industry (Glass tank wall, side, end wall and port neck insulation)
3.Heat insulation for back lining of high temperature industrial furnace
4.Hot surfaces of industrial furnaces, electric furnaces, porcelain furnace, heat treatment furnace, mechanical and metallurgical heat furnace
Back up in steel ladle and torpedo cars
5.Backup insulation to dense refractories
6.Expansion joint material
7.Flue and chimney linings
8.High temperature reaction, heating device-wall lining and back linings

3.ceramic fiber felt
Refractory Fiber Felt
Ceramic fiber blanket, also known as aluminum silicate fiber blanket, because one of its main composition is alumina, and aluminum oxide is the main ingredient of porcelain, so called ceramic fiber blanket. Ceramic fiber blanket consists of spray type and jilt silk rug type, ceramic fiber jilt silk rug has longer fiber length, its thermal conductivity is smaller and thermal insulation performance is better than spray ceramic fiber blanket. So, Most of the thermal insulation pipeline construction used jilt silk rug ceramic fiber blanket.

2016年8月29日星期一

The structure of light burning magnesium ball

There are between light burning magnesium powder crystal molecule and a molecule force there, this force is called intermolecular forces. Intermolecular forces and the polarity of the molecules related to the whole molecule is electrically neutral. Because the molecular positive charge and negative charge of electricity power is equal.

Both internal charge distribution situation, the molecule can be divided into polar molecules and non-polar molecules categories.

Each charge, there is a "charge centers", such as positive and negative charge relative position of the center of the "+" or "one" is represented, the positive and negative charges coincide with the center of the molecule is called the non-polar molecules, the molecules do not coincide called a polar molecule.

As q, the distance l, called the product of the two dipole moment p - P.

Forming a refractory material light burning magnesium ball intensity light burning magnesium ball size depends on the structural strength of the internal structure of the organization's role in the size of the force. Theoretically, the process of forming a refractory company light burning magnesium ball strength, mainly two physical and chemical processes.

After extrusion. Light burning magnesium powder diameter of about 0.074mm, molecules or crystal structure was physics.

According to a large number of experimental and theoretical results show that there is interaction between the charge and the charge, the same charge repel each other, dissimilar charges attract each other. Show that the interaction force between two point charges, whose size is proportional to the product of two charges of electricity.

It is inversely proportional to the square of the distance from the charge. Light burning magnesium powder crystal unit there are also an equal amount of positive and negative charges.

In a moment there will always be a dipole exists, this is called an instantaneous dipole-dipole. Intermolecular forces and the polarity of the molecules related to the whole molecule is electrically neutral. Because the molecular positive charge and negative charge of electricity power is equal.

2016年8月23日星期二

Application and advantages of acid proof brick

Acid Proof Brick
Acid proof brick and plate are widely applied in petroleum, chemical industry, medicine-making, food, paper-making, chemical fertilizer, agriculture, pesticide, chemical fibre, textile industry, smelting, and power-generating plants etc., 
 Acid proof brick use quartz, feldspar and clay as main raw material. It is anti corrosion and acid proof material sinterred through high temperature kiln. It possesses features of high acid resistance, low water absorption rate, not easily be oxidized under room temperature, not easily be contaminated by media. The main component of acid proof brick is silica which is kind of Mullite formed by sintering under high temperature, which is a material with high acid resistance. Because its intensive structure, low water absorption rate, it can be resistant against any alkaline medium with any concentration, but it is not resistant to high temperature molten alkali. Refractory material acid brick containing 70% or more silicon dioxide. It is mainly used in chemical industries, such as ditch puzzle acid, acid wells, acid storage library and impacted ground that bears huge acid.

Article source:
http://www.yilongrefractory.com/news/Application%20and%20advantages%20of%20acid%20proof%20brick.html


2016年8月18日星期四

On the light burning magnesium ball structure

Refractory Balls Used for HBS Regenerator
Application of regenerator in gas burning industrial furnace combustion system
There are between light burning magnesium powder crystal molecule and a molecule force there, this force is called intermolecular forces. Intermolecular forces and the polarity of the molecules magnesia carbon brick related to the whole molecule is electrically neutral. Because the molecular positive charge and negative charge of electricity power is equal. But molecules

Both internal charge distribution situation, the molecule can be divided into polar molecules and non-polar molecules categories.

Each charge, there is a "charge centers", such as positive and negative charge relative position of the center of refractory brick the "+" or "one" is represented, the positive and negative charges coincide with the center of the molecule is called the non-polar molecules, the molecules do not coincide called a polar molecule. CKS molecules, the negative charge carried by the central power

As q, the distance l, called the product of the two dipole moment p - P.

Forming a light refractory material burning magnesium ball intensity light burning magnesium ball size depends on the structural strength of the internal structure of the organization's role in the size of the force. Theoretically, the process of forming a light burning magnesium ball castable refractory material strength, mainly two physical and chemical processes. Physical process of light magnesium burning ball burning magnesium powder and water are mixed by the light

After extrusion. Light burning magnesium powder diameter of about 0.074mm, molecules or crystal structure was physics.

According to a large number of experimental and theoretical results show that there is interaction between the charge and the charge, the same charge repel each other, dissimilar charges attract each other. Show that the interaction force between two point charges, whose size is proportional to the product of two charges of electricity, with two

It is inversely proportional to the square of the distance from the charge. Light burning magnesium powder crystal unit there are also an equal amount of positive and negative charges.

In a moment there will always be a dipole exists, this is called an instantaneous dipole-dipole. Intermolecular forces and the polarity of the molecules related to the whole refractory company molecule is electrically neutral. Because the molecular positive charge and negative charge of electricity power is equal.

Other refractory material article:

http://www.yilongrefractory.com/industry_news.jsp

2016年8月17日星期三

Ladle slide gate damage theory and meaning of conjunction

Ladle slide gate plate mainly contains two types, alumina carbon and alumina zirconium carbon. With steel production increasing and steel quality improving, calcium treatment process is applied, therefore, calcium content in the melton steel increased. Using alumina carbon and alumina zirconium carbon slide gate plate when casting steel, SiO2 and Al2O3 in the slide gate plate would mixed with [Ca], [CaO] in the melton steel or slag and get into low-melting point materials and feldspar, which would cause damage of slide gate plate. This type low-melting point materials would be easy to crushed down by erosion, new low-melting point material would re-appear. This progress would cause the erosion heavier, in which way the slide gate plate would be damaged gradually.
Conjunction of slide gate plate can reduce the number of turnover ladle, low down ladle serves and turnover pressure. In addition, slide gate plate conjunction can low down labor working, improve ladle lining temperature, thus low down casting temperature and bring a number of benefit for production and reducing cost.
From Year 2008, our refractory material factory succeed to develop double conjunction and from Year 2010, triple conjunction is developed. With the triple slide got into the normal production, on-site production, reduce labor intensity, the effect of reducing the cost of generation is very obvious.

Article source:

2016年8月10日星期三

insulating castable,Clay, High Alumina insulating bricks is heat insulation material used for steel plants Heating Furnace

Clay, High Alumina Insulating Bricks
The use of the bricks can reduce the heat capacity of kiln walls and promote the heat efficiency of kilns. The product is applicable for constructing industrial kilns and inner lining of kilns.
 Clay, High Alumina Insulating Bricks Introduction:

Produced with unique advanced technology, the clay and high alumina heat insulating bricks possess the characteristics of high intensity for pressure and good thermal shock stability. The use of the bricks can reduce the heat capacity of kiln walls and promote the heat efficiency of kilns. The product is applicable for constructing industrial kilns and inner lining of kilns.



Light-weight Insulating Castables for Heating Furnace Introduction:

Our company manufactures and supplies superior quality range of Insulating Castable that is a light weight refractory concrete. We provide pre-cast and fired castable at industry leading prices and these are widely used as castable for walls, roof and bottom of steel rolling heating furnace.



If you want to know more refractory/insulation material, please click our website:

http://www.yilongrefractory.com/AllProductServlet?id=1&number=20

2016年8月8日星期一

The notes for using slide gate plate




1.Hot mechanical damage, hot chemical erosion and misoperation are the main three reasons for the damage of slide gate plate;
2.Use alumina zirconium carbon slide gate plate, ensure slide gate plate has good erosion resistance and thermal shock resistance; use slide gate and mechanism with reasonable design and even stress distribution, the service life of slide gate plate can be effectively improved;

3.Follow the standard operation procedure during the tapping of molten steel; right and good maintenance of refractory materialslide gate plate can also improve the service life of slide gate plate.

Article source:
http://www.yilongrefractory.com/news/The%20notes%20for%20using%20slide%20gate%20plate.html

2016年8月4日星期四

Some knowledge about Magnesia Carbon Brick in changxing refractory

Magnesia Carbon Brick
Magnesia Carbon Brick is widely used in Electric Arc Furnace sidewalls, converters, hotspots and coldspots, and ladle furnace slag lines.
Magnesia carbon brick is a compound refractory material. It takes use of slag resistance ability of magnesite sand, high thermal conductivity and low thermal expansion of carbon to compensate the poor spalling resistance of magnesite sand which is the biggest drawback.
Magnesia carbon bricks are mainly used in the lining of converter furnace, AC arc furnace, DC arc furnace and slag zone of ladle. The quality of magnesite sand which is the main refractory raw material of magnesia carbon bricks effects much on the performance of magnesia carbon bricks. The higher the content of Magnesium Oxide, the less impurity, the stronger resistance to slag penetration and slag melting loss.

Article source:

Solutions to improve service life of ladle slide gate plate

slide gate plate Slide gate plate  is the most important part among the slide gate nozzle system, which directly control the flow of the...