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Knowledge of aluminum magnesia carbon brick Baidu

Date:2018-01-13 Author: Click:

Aluminum magnesia carbon brick is a kind of lining fire product which is made of super bauxite or corundum sand, magnesia and flaky graphite. It is characterized by high residual linear expansion rate due to the formation of spinel when heated in use, besides the advantages of high corrosion resistance and easy peeling of carbon at high temperature, and thus becomes a new developed high-quality lining brick. Al2O360% ~ 69%, MgO7% ~ 14%, C5% ~ 12%. It has good slag corrosion resistance and thermal shock resistance, micro-re-fired expanded alumina-magnesia-carbon brick has the advantages of corrosion resistance, peeling resistance, balanced corrosion, safe use, less slag staining, easy disassembly and inclusion. It is mainly used for the use of harsh steel lining. Aluminum magnesia carbon brick is used as the lining material in the molten pool and bottom of continuous casting large tundish and refining ladle. Iron and steel industry is the foundation of national economy and an important pillar of social development. The development of refractory industry in iron and steel industry depends on the progress of technology. Especially in recent years, the progress of new heat insulation refractory and ceramic fiber technology provides a strong guarantee for the application of new metallurgical technology. Ceramic fibers cover industrial kilns, heating equipment and heat pipes from 950 to 1600 degrees C, and become the application of high efficiency and energy-saving materials.

Application of ceramic fibers in metallurgical industry in external environment

6 years into a row, as we all know, China is the world's largest iron and steel country. However, in terms of longevity, there are differences between China and foreign countries, the key to shorten the gap is to save energy and reduce consumption. Therefore, in the metallurgical industry, the State Economic and Trade Commission has entered the development stage of "total control, restructuring, improving the competitiveness and efficiency of enterprises". In the aspect of structure adjustment, it is further clarified that the core magnesia-carbon brick of the guiding ideology of "energy saving, compact structure, low cost and environmental improvement" is made up of high melting point alkaline oxide magnesia (melting point 2800 C) and high melting point alumina-magnesia-carbon brick material which is difficult to be attacked by slag. Non oxide additives. Non carbonaceous composite refractories made from carbon binder. Magnesium-carbon brick is mainly used in the lining of converter, AC arc furnace, DC arc furnace and slag line of ladle.

As a kind of composite refractory, magnesia-alumina-carbon brick effectively utilizes the strong slag corrosion resistance of magnesia, the high thermal conductivity and low expansion of carbon, and compensates the biggest disadvantage of poor spalling resistance of magnesia.

Aluminum magnesia carbon brick has four main characteristics: good high temperature resistance; slag resistance; good thermal shock resistance; low high temperature creep.


Effect of raw materials on properties of magnesia carbon bricks

The quality of magnesia has a very important influence on the performance of magnesia-carbon brick. How to select magnesia reasonably is the key to produce magnesia-carbon-alumina-magnesia-carbon brick. Magnesia magnesia magnesia magnesia magnesia sand magnesia magnesia and sintered magnesia, they have different characteristics.

Fused magnesia: grain size is large, impurities are few, silicate phase is small, grain direct bonding degree is high, grain boundaries are few.

Sintered magnesia: grain is fine, impurity is more than silicate phase, and the degree of direct bonding is poor.

As for magnesia raw material, besides chemical composition and microstructure, it also requires high density and large crystallization. Therefore, magnesia is used as the quality index of magnesia raw material for producing magnesia-carbon brick.