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Common sense of magnesia carbon brick manufacturers

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Common sense of magnesia carbon brick manufacturers

Date:2018-05-03 Author: Click:

Magnesia aluminum carbon brick PN series aluminum magnesia carbon brick with special bauxite or corundum as aggregate, and emphasis on strengthening matrix, phenolic resin as binder, press molding, has the characteristics of corrosion resistance, anti peeling and high strength. It is suitable for the bottom of steel bag and wall and other parts.

Magnesia carbon brick manufacturers

PN series magnesia al carbon brick is based on the aluminum magnesia carbon brick to adjust the technology and technology, enhance the corrosion resistance and anti peeling property of the material. It is suitable for the bottom of the steel package and the wall and other parts, and can obviously improve the service life of the ladle. The application of carbon in refractory materials has been widely used in the current metallurgical industry. In the past, many new products have been developed to adapt to the new metallurgical technology and the development of refractory technology. Refractory experts have long known that different forms of carbon exhibit excellent properties in refractories. In the refractory oxide, carbon can reduce the wettability of slag, molten steel and refractory material, increase its thermal conductivity and reduce its expansion, so that the refractory has excellent thermal shock resistance. In addition, carbon has high thermal stability and its sublimation temperature is about 4000 C. Under the pressure of 110~140bar, the three-phase point (solid / liquid / gas) of carbon in the phase diagram is close to 4020 degrees centigrade, so when the pressure is lower than 110bar, carbon sublimation does not melt. Because carbon is oxidized at high temperatures, the above results can only be applied under certain conditions.

At present, the most important applications of carbon containing refractories are:

1. converter, electric furnace and ladle lining

2. melting metal crucible

3. key parts for continuous casting

Refractories for 4. blast furnace ironmaking

5. by adding carbon, a variety of refractory bricks, especially magnesia carbon high-grade basic refractories, can be produced.

There are many ways to add carbon to refractory materials:

1. tar pitch or synthetic resin impregnated magnesia al carbon brick

The porosity of sintered oxide refractories is about 12%, and most of these pores can be filled with tar pitch or resin. Due to volatilization and relatively low density of volatiles, the residual carbon rate of these products is about 2%~3%. The aluminum magnesia carbon brick made by special grade bauxite clinker, electric fused magnesia, phenolic resin and high pure graphite, which is developed with various additives, has been applied to the 80 ton converter steel ladle in Xuansteel steelmaking plant. It meets the requirements of the production. The.1 wet filling is a mixture of refractory aggregate, binder, additive and water to make a certain consistency. A method of spraying mud onto the gunning surface by means of gunning machine and compressed air magnesia alumina carbon brick. Its characteristics are simple operation, high adhesion rate and quick sintering. But because of the large water content and fine grain, the shrinkage is also large. At the same time, because the spray coating is thinner, the durability is not good.

The 2 semi dry spout is a mixture of refractory aggregate, binder and additive, mixed with water through the water ring hole of the spray gun and a method of ejecting from compressed air to the spray surface. The amount of water can be adjusted at any time according to the filling situation, which usually fluctuates between 10 and 20%, which is lower than the moisture content of the wet method. It's much more. Therefore, the volume density of the spray filling layer is large, the shrinkage is smaller, the thicker spout layer can be obtained, and the durability is better, but the rebound amount is slightly higher than the wet method, and the spray filling method is more common.

The 3 flame spray is the mixture of refractory aggregate, fluxing agent or heating agent to the nozzle with compressed oxygen, and it is burned with high calorific value fuel and mixed with the fuel. At the moment, the surface of the magnesia, aluminum and carbon brick fire aggregate is heated to the melting or semi melting state, and then the repair method adhered to the lining of the furnace is sprayed. The structure is dense, high strength, corrosion resistance, strong scouring resistance, solid and durable. But the flame gunning device has high cost, complex technology and high energy consumption.