Tabular alumina is pure, completely sintered corundum without any additives. The refractory or castable produced by tabular alumina has good thermal shock stability and bending strength after high temperature treatment. Fused corundum is generally white aluminum oxide and brown aluminum oxide for refractory materials. It is mainly made of alumina or bauxite. Do you know the difference between sintered tabular alumina and fused corundum?
1. Sintered tabular alumina has low impurity content and is evenly distributed, while fused corundum has high impurity content and is unevenly distributed. Sintered tabular alumina uses high-purity industrial alumina as raw material, and no additives are added during the production process. Except for a small amount of mechanical iron entering during crushing (which can be removed by a magnetic separator), other impurities such as iron, silicon, and sodium are trace amounts.
During the production process of fused corundum, iron and carbon need to be added as additives, and the impurity content of iron, carbon, silicon, sodium, etc. is much higher than that of sintered tabular alumina. At the same time, due to the different cooling speeds of different parts during the cooling of the fused corundum molten block, the impurity content of different parts is different. Therefore, fused corundum emphasizes strict sorting, while sintered tabular alumina does not require sorting.
2. Sintered tabular alumina has better thermal shock and spalling resistance than fused corundum. Sintered tabular alumina has better thermal shock and spalling resistance because it has a certain number of blocked pores. Spherical blocked pores can effectively resist thermal shock and prevent the spread of cracks.
However, fused corundum has more open pores and fewer blocked pores, and it forms larger single crystals during a slower cooling process. These single crystals produce microcracks during the crushing process, thereby reducing the thermal shock and spalling resistance.
3. The consumption process of sintered tabular alumina is far more energy-efficient and environmentally friendly than that of fused corundum. Fused corundum consumption is a well-known high-energy consumer. Each ton of fused corundum consumes 2300-3300 degrees of electricity, while the comprehensive energy consumption of sintered tabular alumina is only one-seventh to one-tenth of that of fused corundum.
A large amount of waste gas and waste slag is emitted during the production process of fused corundum, while the consumption of sintered tabular alumina uses natural gas as the heat source. In addition to the emission of carbon dioxide in natural gas, there is no other waste gas and waste slag emission.
