Application of refractory aggregate and powder in castable.

The unshaped refractory castable, refractory aggregate amount is generally 63%~73%, acting as a framework, can significantly affect the performance. Refractory powder dosage is 17%~37%, filling aggregate porosity and improve the construction resistance and so on. Some refractory powder, such as clay and ultra – fine powder, or a good bond. The ideal particle gradation is the gap caused by the coarse aggregate is just fine aggregate void filling, between the two has been refractory powder filled, no no surplus, to achieve the greatest packing density, in order to get the best performance.

Refractory aggregate divided into coarse and fine aggregate. Average particle size greater than 5mm is referred to as the coarse aggregate; 5mm and 5mm to 0.09mm is referred to as the fine aggregate. Habit will 5~0.15mm particles known as fine aggregate. Aggregate critical particle size depends on the thickness of the lining of the body, as shown in the following table. At present, the refractory critical particle size is reduced tendency, generally use 8mm or 5mm, pump feeding with 3mm. It should be noted that, in the preparation of unshaped refractory materials, the refractory aggregate gradation shall request the composite table technology.

In the production of unshaped refractory materials used as refractory materials, refractory aggregate and powder: bauxite, clay material, semi silica raw material, silicon material, magnesium material, kyanite group mineral raw materials, mullite, alumina, corundum, spinel raw material, silicon carbide, silicon nitride, chromium iron, zircon etc..

After the destruction of these refractory raw material, crushing, unshaped refractory materials to prepare the composite requirements of raw materials, to ensure the quality of the product, before use must be tested raw materials.

Commonly used ladle castable varieties

1. Clay brick, clay brick and A12O3 content in ordinary during 30%-50%, low price. It is important for ladle backing layer and ladle bottom.
2. High alumina brick. The content of A12O3 brick during 50%-80%, it is important for the working layer of ladle.
3. Wax brick. The brick is characteristic of high content of SiO2. In general more than 80%, than the corrosion resistance and the mass of clay bricks, and without residue. Used in ladle wall and the bottom of the bag.
4. Zircon brick. The brick mainly for ladle slag line. The content of ZrO2 in ordinary brick during 60%-65%.
5. Magnesia carbon brick. The brick for ladle slag line, special apply to multiple ladle continuous casting sessions. The content of MgO in ordinary brick in 76% and, in the meantime the carbon content of 15%-20%. Its characteristic is to slag corrosion, corrosion resistance, good peeling property.
6. Alumina magnesia castable. The castable for ladle body, its characteristic is the utility in molten steel, casting material of MgO and A12O3 and Al ovate spinel, improved the lining slag resistance and thermal shock resistance.
7. Alumina magnesia carbon brick. This brick is on aluminum magnesium casting material basically developed ladle lining, has a long service life.
8. Unfired brick. Now the ladle for fire brick materials, almost all can be made compared to unburned brick. Its characteristic is compared with the producer process simple, low unit price. The brick itself has certain machine intensity and corrosion resistance, easy construction and masonry

If ladle for refining itself, you can also choose the MgO-Cr2O3-A12O3 series and MgO-CaO-C series refractory castable, important: magnesia chrome brick, magnesia chrome brick, aluminum dolomite brick. As in the brick of ladle lining containing graphite material, preferably coated with a layer of chemical synthetic coating at the surface, the dike in siopao, lining surface compound loose, affect the using life.

Henan refractories enterprises should pay attention to the future bauxite resource allocation policy

Held in Henan Provincial Department of land and resources of the “province of important mineral resources integration and resource allocation policy advice suggestions forum”, to the government proposal mentioned: in the past, “bauxite to alumina key enterprise configuration, do not take account of the long-term, accounts for the refractories industry, the country’s first production, higher value-added for mine future demand”, “keeping coal, bauxite as our strategic resources”, “provincial development and Reform Commission approved the allocation of bauxite alumina enterprises and general enterprises, large enterprises (refractory alumina silica refractory material products with annual sales of X billion Yuan)”.

This information is for the refractory industry excited. Future bauxite resource allocation policy, although the government is not clear, but how to make good use of limited resources, good use in the steel blade, improve the added value of raw materials, to create greater value for society, this is the current production enterprises and Industry Refractory Materials Science and technology workers, should first consider the question,and in future should bear the obligation and responsibility.

Refractory material is the basic material of all industrial furnace lining will use, plays an important role in the industry of green production, technological progress, energy-saving emission reduction, etc.. Henan refractory material industry has developed into a regional advantage industry, advanced technology, complete varieties complete; refractory accounted for 48% of the total output, and made important contributions to the economic development of Henan. In the Zhengzhou area of Xinmi, Gongyi, Dengfeng has become the local pillar industry. Henan refractory material industry is also an urgent hope that the government gives priority to the allocation of resources in the future bauxite.

Where have better refractory brick

Either online or in real life, if want to buy Bricks, people always ask to refractory brick where do good, want to buy it, sure to buy good quality, reliable manufacturers, after all, refractory brick is directly related to the safety problem of an enterprise’s normal operation production and people, so important, how can people do not attach importance to. So we must find a refractory brick manufacturers do well, which can let people use at ease comfortable. So today I will introduce a manufacturing fire brick is particularly good manufacturers to you, it is Luoyang Yilong refractory Co. Ltd, the company production of refractory brick that people can buy  with nothing to fear.

Why dare to say so, because the refractory material of our nation’s most famous in the country only a few places, but Henan Luoyang is one of them, so that the only good refractory raw materials to produce the refractory brick have good quality, If you want to buy refractory brick, especially welcome to our company to purchase, we will provide the high quality service and product to make you satisfied. If any quality problems appeared in the process of using, we can be solved in time for you.

Customer demand is our goal to struggle, we believe that the quality of the raw materials for the production of quality products, excellent staff to provide quality services. With “integrity, pragmatic, efficient, innovation” for the purpose of the us to the best quality products, the best quality service, warmly welcome new and old customers at home and abroad to visit our company.

Refractory material for sliding gate

Refractory pouring steel used, 60 years ago using socket plug, 60 time development of the slide gate, from ladle to tundish and from the tundish to note the steel crystallizer for continuous casting, is a great change of refractory material. As the control flow of liquid steel puts forward the earliest sliding gate scheme in 1885 1964, American patent, Germany in 1968 and Japan respectively started using sliding gate, promote the use of start of 70 years in China

Sliding gate system (including upper and lower nozzle, upper and lower sliding) as ladle and tundish molten steel flow control system, with good controllability, can improve the productivity and rapid development.

Sliding nozzle system is superior to the traditional plug nozzle control system, it promotes the development of continuous casting technology, process and refining ladle at the same time, along with the steel output rise and steel quality, at the same time development of continuous casting technology of multi furnace must be sliding nozzle system to increase the service life, reduce operating costs.

Therefore, sliding structure and sliding gate refractories are improving. Due to the development of continuous casting ratio increases and the furnace refining technology to promote the continuous promotion of sliding gate technology. At present, the slab and large slab continuous casting using sliding gate, billet continuous casting are also part of the sliding gate. Traditional outlet, plug technology used in cast stainless steel in tundish is extremely special occasions.

Because the slide (Sliding Plate) direct control of molten steel flow, it is considered to be the most important sliding gate part in the system, in order to obtain a longer service life and stable operation, slide brick as refractory sliding gate system and mechanical components are required to have excellent performance.

The submerged nozzle of different materials

In order to solve the problem of submerged entry nozzle slag line part is serious erosion, and prevent the alumina adhesion caused by nozzle clogging, a series of novel submerged nozzle was developed based on aluminum carbon.

1. Al2O3-C/ZrO2-C composite nozzle

With the development of continuous casting technology, steel increased, pulling speed increase, requirements to further improve the slag line part corrosion resistance, in the slag line with zirconium carbon refractory materials as composite layer. Because ZrO2 has excellent chemical stability to be CaO-Al2O3-SiO2 slag erosion, high temperature melt into the residue of ZrO2 increases the viscosity of slag, but not by ZrO2 particle melting and increase the apparent viscosity of the slag, thereby reducing the erosion of slag on ZrO2-C layer, to improve the durability of the nozzle. The higher content of ZrO2 anti erosion ability.

2. (MgO-C) – (Al2O3-C) – (ZrO2-C) composite nozzle

In order to improve the durability of the submerged entry nozzle, the molten steel flow part adopts MgO-C to control quality, prolong the service life and improve casting speed, the slag line part uses ZrO2 or BN to improve corrosion resistance. Body parts using Al2O3-C.

3. ZrB2-C protective sleeve

Sen slag line part of the protective sleeve, requirements of material has good resistance to spalling resistance. Poor high temperature stability of ZrC, ZrN, and Zr boride. Adopt ZrB-C material, add appropriate amount of metal Al to improve the corrosion resistance, the critical size reduction of ZrB2, prevent spalling resistance drop.

4. The submerged entry nozzle add AZT, AZTS material

Using Al2O3-ZrO2-TiO2 sintering and electric melting method (AZT) and Al2O3-ZrO2-TiO2-SiO2 (AZTS) materials, has low expansion coefficient, corrosion resistance, good stability characteristics under reducing atmosphere. Using two kinds of raw materials of AZT and AZTS, fused silica amount according to certain proportion of particles (FS), using resin as binder, submerged entry nozzle, the isostatic pressing of excellent performance, high mechanical strength, corrosion resistance and good thermal shock resistance characteristics, to meet the needs of multiple ladle continuous casting. Accession to the AZT and AZTS products, the nozzle has good thermal shock resistance, with the accession to the AZTS of the submerged entry nozzle thermal shock resistance optimal.

5. Long time multi furnace continuous casting of the submerged entry nozzle

Green resistance difficult clogging and oxidation resistant coating produced in solving the nozzle cavity, developed the insulation type argon blowing immersion nozzle, because of the reduced temperature, prevent the crack due to the stress, different degree of reduced cavity with slag.

6. Thin-walled aluminum carbon submerged nozzle

The submerged entry nozzle wall consists of an upper and lower section of zirconium aluminum carbon composite, thin-walled nozzle made of wall thickness of only 12.5mm. Its good thermal shock resistance, strong corrosion resistance, in use are not falling, no crack, erosion is slight, can increase the number of continuous cast, reduce material consumption, improve the quality of casting billet.

Refractory material for torpedo car liner

Refractories for torpedo car liner, countries basically the same. In the complex structure and damageable parts, such as receiving iron mouth and nozzle etc., some with unshaped refractory materials instead of special-shaped brick, the use of more successful. America by phosphoric acid high alumina castable produced by iron mouth and spout lining, simple construction, no residue, long life. Japan, Germany, Britain and other countries of the torpedo car receiving iron mouth parts damaged,

the fire-resistant paint spray repair, also obtained better technical and economic results.

Foreign hot metal pretreatment with refractory materials generally use Al2O3 - SiO2 castables, the content of Al2O3 is 70% to 80%. If add SiC, C or Cr2O in the spray material, can effectively improve the anti slag corrosion, adding steel fiber will improve the spalling resistance. Recently developed zircon castable, the effect is relatively good. When the torpedo car using Al2O3 - SiC refractory brick, masonry should also be the same material of Al2O3 - SiC - C fire clay.

With the increasingly wide application of torpedo car, also put forward higher requirements on the selection of refractory lining, in addition to excellent, also should consider reasonable use question, in order to further extend the torpedo car life, and reduce the cost of.