High Alumina Brick Production Technology

Production technology of high alumina refractory brick and clinker clay bricks are similar, the difference is that the ingredients in the clinker ratio is higher, can be as high as 90 ~ 95%, before breaking the clinker grading sorting and screening in addition to iron, firing temperature is higher, such as Ⅰ, Ⅱ high alumina brick with tunnel kiln firing when the general is 1500 ~ 1600 ℃.

According to different resource conditions and product requirements, the following types of raw materials can be used: high-alumina bauxite consisting mainly of water-bearing aluminum-oxygen minerals (monohydrate, sanshui bauxite, etc.); Silicalite group minerals (including blue SPAR, andalusite, silicalite, etc.); Artificial synthetic raw materials, such as industrial alumina, synthetic mullite, fused alumina and so on. China's high aluminum-vanadium soil is rich in resources, good quality, the origin is mainly distributed in Shanxi, Henan, Hebei, Guizhou, Shandong and other places. The high aluminium-vanadium soil produced is mainly a mixture of two minerals, monohydrate (-Al2O3·H2O) and kaolinite.

The fireproof degree of high alumina brick is higher than that of clay brick and semisilicite brick, up to 1750~1790℃, which belongs to senior refractory material. Because Al2O3 is high in high aluminum products, less hybrid mass and less vitreous, the softening temperature of load is higher than that of clay bricks. However, the softening temperature of load is still lower than that of silicon bricks due to the lack of mesh structure formed by mullite crystallization. Al2O3 is more in this series of refractory bricks, which is close to neutral refractory material and can resist the corrosion of acid slag and alkaline slag. Due to the SiO2 contained in the refractory bricks, the ability of alkali slag is weaker than acid slag.

High alumina refractory brick is mainly used for lining of blast furnace, hot air furnace, electric furnace top, blast furnace, reverberatory furnace and rotary kiln. In addition, high alumina brick is widely used as open hearth grate brick, plug head used in pouring system and water mouth brick. However, the price of high-alumina brick is higher than that of clay brick, so it is unnecessary to use high-alumina firebrick where the clay brick can meet the requirements.

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