Analysis on Product Characteristics and Classification of Mullite Insulating Bricks

Mullite insulation brick is mullite (3Al2O3 · 2SiO2) as the main phase of the high-alumina refractories. General alumina content of 65% to 75%. Mineral composition In addition to mullite, which contains the lower alumina also contains a small amount of glass phase and cristobalite; containing higher alumina also contains a small amount of corundum. Mullite insulation brick can be directly used for high temperature furnace lining, has been widely used in shuttle kiln, roller kiln, glass and petrochemical furnace lining.

First, the mullite insulation brick product features:
1, low thermal conductivity, with good insulation effect;
2, mullite insulation brick low melting, due to low thermal conductivity, mullite series of lightweight insulation brick accumulation of little heat energy, intermittent operation in the energy-saving effect is obvious; 3, impurity content is very low, Metal and other oxide content, therefore, high refractoriness; higher aluminum content in the reducing atmosphere to maintain good performance;
4, mullite thermal insulation brick high pressure strength;
5, the appearance of accurate size, speed up the masonry speed, reducing the use of refractory material mud to ensure the strength and stability of masonry, lining to extend the life;
6, mullite insulation brick can be processed into a special shape. To reduce the number of brickwork and joints.
Second, the mullite insulation brick classification: mullite insulation brick according to the density of different light and heavy mullite bricks, according to the use of different temperature is divided into: 1350 mullite insulation brick, 1450 mullah Stone insulation brick, 1550 mullite bricks and so on. Mullite insulation brick performance and its application: high refractoriness, up to 1790 ℃ or more. The softening start temperature of the load is 1600 to 1700 ° C. Room temperature compressive strength of 70 ~ 260MPa. Thermal shock resistance is good. There are sintered mullite bricks and fused mullite bricks. Sintered mullite brick to bauxite clinker as the main raw material, adding a small amount of clay or bauxite as binder, by molding, firing and made. Fused mullite bricks to high bauxite, industrial alumina and fireclay refractories as raw materials, by adding charcoal or coke fine particles as a reducing agent, forming after the use of reduced melting method to manufacture. The fused mullite is more crystalline than the sintered mullite and has better thermal shock resistance than the sintered product. Their high temperature properties depend mainly on the alumina content and the homogeneity of the mullite phase with the glass distribution. Mainly used for hot stove top, blast furnace and the bottom of the furnace, glass furnace regenerator, ceramic sintering kiln, oil cracking system, such as dead angle lining.

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.

Submerged Entry Nozzle---Refractory 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

Refractory plastics for heating furnaces

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 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.

Analysis on Performance Requirement of Refractory material in Heat Treatment 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.

Measures to extend the life of the ladle refractory material

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

Technical Innovation of 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

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

Application and advantages of 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

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

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

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

The application and working principle of Sliding Nozzle

Nowadays refractory material sliding nozzle systerm is becoming more and more important in the process of melting and be an necessary part for melting. It is the control device of molten steel in casting process, which can precisely adjust the water flow from ladle to tundish, to make the flowing and flowing out of the molten steel can reach a balance, so that the continuous casting operation is easier to control.Because of its good controllability, the sliding gate system can improve the efficiency of steel making and has been developed rapidly. At present, the sliding gate system is widely used in ladle and tundish..............

Article sourse:
http://www.yilongrefractory.com/news/The%20application%20and%20working%20principle%20of%20Sliding%20Nozzle.html

The reasons that the damage of ladle upper nozzle and its reventive measures

Ladle nozzle is widely used in steel plant.

1. The reasons that the damage of ladle upper nozzle
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 refractory material sliding gate nozzle system, measures should be taken as below:

.......................

Article source:
http://www.yilongrefractory.com/news/The%20reasons%20that%20the%20damage%20of%20ladle%20upper%20nozzle%20and%20its%20reventive%20measures.html

The reasons that the damage of ladle upper nozzle and its reventive measures

Ladle Nozzle is made from corundum, bauxite, flake graphite, antioxidant and phenolic resin formed on heavy duty presses in harden steel or carbide die by using white fused alumina. To obtain maximum packing density, nozzles are fired at extremely high temperature in order to increase corrosion resistance to metal and slag the fired nozzles are further processed.

1. The reasons that the damage of ladle upper nozzle
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 refractory material 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 the corundum quality upper nozzle.
2) Choose to use products with high mechanical strength.
3) Note the operations of ladle casting process, to avoid the discharge of slag.

Article sourse:

http://www.yilongrefractory.com/news/The%20reasons%20that%20the%20damage%20of%20ladle%20upper%20nozzle%20and%20its%20reventive%20measures.html

Fused Cast Refractories And Float Glass Furnaces

Fused cast alumina block includes alpha alumina block, beta alumina block and alpha-beta alumina block. Alpha-beta alumina block mainly consists of intertwined crystals of alpha alumina and beta alumina with just a small amount of glass phase. It has excellent corrosion resistance to glass liquid under 1350℃ and produces almost no pollution to the glass liquid, so it is widely used in working tank, feeder channels, superstructures and lipstone of the high quality glass and special glass furnaces. Beta alumina block has a higher resistance to alkali vapor, thus it has excellent thermal shock resistance and does not form molten droplets. It is the best material for molter crown, port crown,feeder channel,ect.. After the oxygen-fuel technology is applied in the glass furnaces, beta alumina block replace the silica brick to be used in the crown.

Fused cast AZS block is the most widely used fused cast refractories used in the float glass furnace due to its good corrosion resistance to glass liquid and good high temperature performance. According to the content of ZrO2, fused cast AZS block can be divided into AZS 33#, 36# and 41#. According to the casting method, fused cast AZS can be categorized into PT AZS, QX AZS, ZWS AZS and WS AZS.

The crystal structure of AZS mainly consists of the eutectic crystal of Al2O3 and ZrO2, scattered baddeleyite crystal and a small amount of glass phase and pores. Its micro-structure determines its performance, while its micro-structure is up to the chemical composition, melting method and annealing method.
AZS 33# is generally used in the sidewall, the bottom paving block and the superstructure. In order to eliminate the horizontal mortar joints, large sidewall block made of QX AZS 33# is used. Due to its higher ZrO2 content and better corrosion resistance, AZS 41#, especially WS AZS 41#, is always used in the demanding areas such as the feeder corner, throat, etc..

Fused cast refractory is a special type of refractory made by melting the raw materials in the electric arc furnace, pouring the melt into a mold and cooling the melt to solidify. It features dense structure, good corrosion resistance, low pollution to glass and long service life. Its quality and development has great influence on the service life of the float glass furnace.
Fused cast high zirconia block is specially designed refractory for glass furnace application. It is made of artificial synthesis high purity raw materials through special casting process. The crystalline texture consists of baddeleyite and with the characteristics of excellent high temperature and corrosion resistance, low blister and stoning potential. These advantages can prevent liquid glass from pollution effectively. It is used in sidewall, throat cover, throat support, electrode block, and dam block parts.

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.

Development of Ladle Lining Refractory Materials

20th Century 50--70 years, China's steel plants mainly used aluminosilicate refractory materials, including clay, alumina brick and so on. Since the 1980s, China has successively developed the aluminum-magnesium carbon, coal quality calcium and magnesium and other several series of new steel package refractories. Wherein the aluminum-magnesium carbon refractory materials are of varieties, all specifications, is China's major ladlerefractories.
..................
Article source:
http://www.yilongrefractory.com/news/Development%20of%20ladle%20lining%20refractory%20materials.html

Application of monolithic refractories on industrial furnaces

Unshaped refractory material is a supporting material for building furnace, which can be divided into two categories: ramming material and casting material. They are widely applied on industrial furnace, mainly used in the furnace bottom portion, inconvenient construction part and masonry part of cooling element.   ..............................

read more:
http://www.yilongrefractory.com/news/Application%20of%20monolithic%20refractories%20on%20industrial%20furnaces.html

Influence of LF Refining Slag Adjustment on Ladle Refractories and Refining Effect

In order to take with the problem of serious erosion of ladle lining during the desulfrization of LF refining, LFrefining slag was adjusted and calcium aluminate system substituted fluorine free refining slag with fluorine. After the adjustment of the slag, the erosion conditions on ladle were improved greatly and refining number, refining ratio and remaining lining thickness after demolishing all increased substantially. 
........................
http://www.yilongrefractory.com/news/Influence%20of%20LF%20refining%20slag%20adjustment%20on%20ladle%20refractories%20and%20refining%20effect.html

How to Choose Refractory Bricks Used for Different Parts of Blast Furnace

1. Good corrosion/erosion resistance 2. High temperature performance 3. Longer service life 4. Stable structure 5. Thermal shock resistance

How to choose refractory brick used for different parts of blast furnace?

When choosing refractory brick used for different lining parts of blast furnace, we should follow some principles. The refractory lining of every part should fit the parts thermal current intensity, so that the lining can maintain previous vertebral shape and stability under the impact of strong heat flux. 

Here are some methods of selectingrefractory brick for sale for every part of furnace lining.
(1) Furnace throat. It mainly needs to withstand impact and abrasion of burden, so generally we use steel brick or water cooling steel brick for the furnace throat.

(2) The upper shaft. Plus the burden descent and ascending gas flow of scour and wear. Therefore, we should choose resistance to chemical erosion and abrasion resistance of refractory material, the most appropriate is high relative density brick, high density, high aluminum brick or phosphoric acid impregnated clay brick.

(3) The middle and lower part of nozzle refractory furnace and furnace bosh. The main mechanism of damage is thermal shock, high temperature gas scouring, and impact of alkali metals, zinc and carbon deposition, as well as chemical erosion of the initial slag. For those three parts, we should choose refractory materials with properties of thermal shock resistance, slag erosion resistance and erosion prevention. For blast furnace whose volume is smaller than 1000m3, we can use aluminum carbon brick. 

(4) Furnace bosh. Hot gas erosion and iron slag erosion are the main reasons for furnace bosh damage, this part of the heat flux intensity, refractory material refractory fiber felt life not long (as long as 1 to 2 months, as short as 2 to 3 weeks), generally used in refractory degree is high, load softening temperature is high and the volume density of refractory material, such as the high aluminum brick, alumina carbon brick. 

(5) Hearth tuber. This site is only in blast furnace of oxidation reaction area, high temperature from 1900 to 2400 DEG C, lining by damage caused by high temperature thermal stress. Composite brick masonry hearth tuyere zone is adopted by the modern blast furnace, material for high alumina, corundum Mo mullite; corundum and silicon nitride combined silicon carbide, useful also hot pressed carbon block. 

(6) The lower part and bottom of hearth. For those two parts, we use hot pressing small carbon brick, micro porous carbon brick, and hot semi graphite carbon brick with high thermal conductivity, good resistance to penetration, good resistance to chemical erosion, low porosity and micro aperture, as well as brown corundum or gray corundum brick used for ceramic cup.

A Big Change -- Yilong Refractory, renamed as Changxing Refractory

    

    A big change has taken place in August 18, 2014, Yilong Refractory is officially renamed as Changxing Refractory due to the largest investment from Changxing Refractory. And also, the full name changes from Luoyang Yilong Refractory Co., Ltd. to Xinmi Changxing Refractory Co., Ltd. In the meantime, Yilong Refractory, exchanges the place with Changxing Refractory, being one of the three subsidiary corporations. 
    The name has changed while what will remain unchanged are our product quality and service. Changxing Refractory will take the responsibility of Yilong Refractory to provide customers with excellent services. 
    Thanks for your longtime support and welcome to cooperate with Changxing Refractory. Changxing Refractory will not disappoint you.