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

The influences of raw material on magnesia carbon brick performance

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

Recommendations active national green inorganic thermal insulation materials

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.

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

1.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

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

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.