Compared with anti-stripping high alumina bricks, the process ratio and raw materials of high alumina firebricks are both made of bauxite with high aluminum content as the main raw material, but anti-stripping bricks use high alumina bauxite and add zircon, so the product has higher strength, chemical corrosion resistance, low thermal expansion coefficient and thermal conductivity. High aluminum bricks only use high alumina as raw material, and their chemical corrosion resistance is not as good as anti-stripping bricks, mainly because anti-stripping bricks have better thermal shock stability than high alumina refractory bricks.
Anti-stripping bricks have strong anti-stripping ability, and also have the properties of resistance to potassium, sodium, sulfur, chlorine and alkaline salts, low thermal conductivity, etc. They are the selected products for cement kiln transition zone and decomposition zone. The biggest feature is good thermal shock resistance and strong ability to adapt to various atmosphere environments. Used in the preheating zone or decomposition furnace of rotary kiln and grate cooler.
There is also a difference in the firing temperature between high-alumina bricks and anti-stripping high alumina bricks. The high-temperature firing temperature of anti-stripping bricks is 30°C higher than that of high-alumina bricks. The thermal conductivity of anti-stripping bricks is lower than that of high-alumina bricks, and the load softening temperature is higher. The reason why high-alumina bricks cannot enter large-scale cement rotary dry kilns is that they have a low service life, and frequent repairs and kiln shutdowns cause a lot of energy loss and economic losses. More importantly, it cannot resist the inherent disadvantages of being used in harsh parts.
The refractoriness of high-alumina bricks is mainly affected by the aluminum content, and the refractoriness increases with the increase of aluminum content. High-alumina bricks are neutral materials, and their ability to resist alkaline slag is much weaker than that of anti-stripping high alumina bricks. High-alumina bricks are mainly used in blast furnaces, hot blast furnaces, electric furnace tops, blast furnaces, reverberatory furnaces, and calcium carbide furnace linings. In addition, high-alumina bricks can also be used to produce checker bricks, plugs, nozzle bricks, etc.
High-alumina bricks have more uses than anti-stripping bricks, with large usage and many differences in price. In fact, the selection of these two types of bricks depends on the erosion of the furnace lining and the temperature, and each has its own performance and use effect.
