With the development of technology, there are many new products of furnace lining materials. Below, learn about it with Xiaobian!

    1. Acid lining

    The acid furnace lining is mainly quartz sand, which is cheap, widely distributed, good insulation, low construction requirements, fewer defects in use, and relatively stable production, but the quartz sand has low refractariness, which can not meet the requirements for casting large medium frequency furnaces. In addition, there are secondary phase changes in the heating process, poor standard stability, chemical stability is not ambitious, and simple reaction with slag to form corrosion. In order to prevent these defects can be selected fused quartz, its high content, silica content is greater than 99%, the refractoriness is significantly advanced, close to the melting point, and there is no secondary phase change when heating, there is no temperature standard change, thermal shock stability is also greatly advanced.

    2, neutral lining

    The choice of fused corundum as the intermediate frequency furnace lining, because the melting point of white corundum is as high as 2050℃, the hardness is as high as 8, wear resistance, high temperature resistance, chemical stability is also better than quartz. Suitable for high temperature cast steel or large furnace lining. It is characterized by the same defects of phase transformation and large coefficient of thermal expansion, and in practice, the participation of spinel micropowder can significantly advance corrosion resistance and standard stability.

    3, basic lining

    Traditional basic furnace lining selection of magnesia dry ramming molding, the advantages are high refractoriness, close to 2800℃, the defect is large expansion coefficient, easy to crack, magnesia lining corrosion resistance, long life, low price, very widely used, when used to participate in the white corundum powder or spinel powder significantly forward the service life.

    4. Spinel lining

    Spinel lining is a new kind of lining material, it uses alumina and magnesium oxide molding, high temperature sintering or electric melting pre-formed spinel, and then produces various particle standards as required, used as medium frequency lining, the binder still uses borax or boric acid, and has the advantages of white corundum lining and magnesia lining, and prevents its defects, is the development direction of large medium frequency lining and high temperature lining. Many imported lining materials belong to this type.

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