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The production technology and application field of magnesia-chrome brick factory
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Author:佚名
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Published time: 2021-04-16
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Magnesia-chrome brick is mainly used in metallurgical industry, such as building open hearth furnace top, electric furnace top, furnace outside refining furnace and all kinds of non-ferrous metal smelting furnace. The high-temperature part of the furnace wall of the ultra-high power electric furnace is made of molten magnesia-chrome brick; the high-erosion area of the refining furnace outside the furnace is made of molten magnesia-chrome brick and the high-erosion area of the non-ferrous flash melting furnace is made of molten magnesia-chrome brick and the magnesia-chrome brick made of the synthetic material. In addition, magnesia-chrome bricks are also used in the sintering zone of cement rotary kiln and the regenerative chamber of glass kiln.
The production process
The production technology of magnesia-chrome brick is similar to that of magnesia-chrome brick. In order to eliminate bricks in the firing process due to MgO and Cr2O3, Al2O3 or
The loosening effect caused by the expansion of the reaction of iron oxides to spinel can also be used to make magnesia-chrome bricks with synthetic co-sintered materials. In addition, there are non-burned magnesia-chrome bricks, for example, non-burned magnesia-chrome bricks bonded with an inorganic magnesium salt solution. The production process is simple, the cost is low, the thermal stability is good, but the high temperature strength is far less than the fired brick. In the late 1950s, a so-called "direct bonded" magnesia-chrome brick was developed. The characteristic of this kind of brick is raw material pure, burn high temperature, direct union between the high temperature phase such as square magnesite, spinel, etc., the low melt phase such as silicate is isolated island shape distribution, therefore, significantly raised the high temperature strength of brick and slag resistance.
It is an effective measure to eliminate the loosening effect to make bricks by combining the fine powder produced by calcination of chromate-magnesite co-grinding compacted blank with coarse magnesite particles. Compared with the common magnesia-chrome brick, the magnesia-chrome brick made by this method has lower porosity, higher compressive strength, higher softening temperature under load and higher flexural strength. The slag resistance and high temperature strength of magnesia-chrome brick made from chrome-magnesite powder compaction and synthetic magnesia-chrome sand calcined at high temperature are better than other magnesia-chrome brick.
In addition, there are also molten magnesia-chrome brick directly cast by melting magnesia-chrome material in electric furnace (see figure for microstructure, see color picture), fused magnesia-chrome brick produced by electric melting magnesia-chrome material according to the brick making process and combined with magnesia-chrome brick, etc.
The production process
The production technology of magnesia-chrome brick is similar to that of magnesia-chrome brick. In order to eliminate bricks in the firing process due to MgO and Cr2O3, Al2O3 or
The loosening effect caused by the expansion of the reaction of iron oxides to spinel can also be used to make magnesia-chrome bricks with synthetic co-sintered materials. In addition, there are non-burned magnesia-chrome bricks, for example, non-burned magnesia-chrome bricks bonded with an inorganic magnesium salt solution. The production process is simple, the cost is low, the thermal stability is good, but the high temperature strength is far less than the fired brick. In the late 1950s, a so-called "direct bonded" magnesia-chrome brick was developed. The characteristic of this kind of brick is raw material pure, burn high temperature, direct union between the high temperature phase such as square magnesite, spinel, etc., the low melt phase such as silicate is isolated island shape distribution, therefore, significantly raised the high temperature strength of brick and slag resistance.
It is an effective measure to eliminate the loosening effect to make bricks by combining the fine powder produced by calcination of chromate-magnesite co-grinding compacted blank with coarse magnesite particles. Compared with the common magnesia-chrome brick, the magnesia-chrome brick made by this method has lower porosity, higher compressive strength, higher softening temperature under load and higher flexural strength. The slag resistance and high temperature strength of magnesia-chrome brick made from chrome-magnesite powder compaction and synthetic magnesia-chrome sand calcined at high temperature are better than other magnesia-chrome brick.
In addition, there are also molten magnesia-chrome brick directly cast by melting magnesia-chrome material in electric furnace (see figure for microstructure, see color picture), fused magnesia-chrome brick produced by electric melting magnesia-chrome material according to the brick making process and combined with magnesia-chrome brick, etc.
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