Why is Garnet a Good Abrasive?
With the continuous development of the industry, the production of tabular alumina has been domestically produced. Due to its high refractoriness, excellent thermal shock resistance, creep resistance and wear resistance, the application of tabular alumina in the refractory industry is also increasing.
Sliding Nozzle
Good thermal shock stability and wear resistance are the first choice for refractory raw materials for sliding nozzles. And sintered refractory tabular alumina can just meet its requirements. At present, the aluminum-carbon sliding nozzle with a proper amount of graphite (or carbon black) and antioxidant added to sintered refractory tabular alumina as the basic material, or the aluminum-zirconium-carbon sliding nozzle with a proper amount of zirconium oxide, graphite (or carbon black) and antioxidant added to sintered refractory tabular alumina as the basic material is still the main body of domestic sliding nozzle materials.
Ladle Castable
With the continuous development of off-furnace refining technology, the use environment of refractory materials in ladles is becoming increasingly harsh. Molten steel now needs to remain in the ladle for extended periods for stirring, heating, and enduring erosion by various steel slags. As a result, the single-material linings (such as magnesium or aluminum) have been replaced by composite materials. The aluminum-spinel system castable, which incorporates wholesale tabular alumina and spinel as the primary materials, is now commonly used for the bottom or walls of the ladle. Additionally, magnesia carbon bricks are employed for the slag line. This combination represents the standard approach for using refractory materials in large and medium-sized ladles.
Prefabricated Parts
Prefabricated parts such as air-permeable bricks, seat bricks, spray guns, impact plates, etc. are not only part of the refractory lining of the ladle, but also play a very important role in the steelmaking process itself. The composite use of sintered refractory tabular alumina, spinel and other refractory raw materials can more effectively improve the thermodynamic properties of refractory materials, that is, improve wear resistance and erosion resistance.
Fused corundum is generally used for refractory materials such as white corundum, sub-white corundum, and brown corundum. It is mainly made of alumina or bauxite as raw materials. The main differences between sintered refractory tabular alumina and fused corundum are as follows:
Sintered refractory tabular alumina has low impurity content and is evenly distributed, while fused corundum has high impurity content and is unevenly distributed. Sintered refractory 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. Iron and carbon need to be added as additives during the production of fused corundum, and the impurity content of iron, carbon, silicon, sodium, etc. is much higher than that of sintered refractory 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 selection, while sintered refractory tabular alumina does not need to be selected.
The production process of sintered refractory tabular alumina is far more energy-saving and environmentally friendly than fused corundum. Fused corundum production is a well-known high energy consumer, with each ton of fused corundum consuming 2300-3300 degrees of electricity, while the comprehensive energy consumption of sintered tabular corundum is only one-seventh to one-tenth of that of fused corundum. A large amount of waste gas and waste residue is emitted during the production of fused corundum, while the production of sintered tabular corundum uses natural gas as a heat source, and except for the carbon dioxide emissions in natural gas, there is no other waste gas and waste residue emissions.
