Application Of Refractory Materials In Aluminum Industry

In the world of non-ferrous metal production, the annual output of aluminum has been ranked first, far more than other non-ferrous metals. Aluminum industry per year consumption of refractory materials than copper, lead, zinc smelting consumes more than the total amount of refractories. According to the process of aluminum smelting industry, the company used its refractories are divided into two categories, namely, electrolytic aluminum refractories, aluminum smelting furnace refractories. Aluminum smelting furnace is based on the aluminum smelting process and the development of a new type of energy efficient melting aluminum furnace, it can well meet the aluminum smelting process, the alloy composition requirements, production is not continuous, single furnace capacity and other requirements, Reduce consumption, reduce burns, improve product quality, reduce labor intensity, improve working conditions and improve production efficiency.Refractory Materials

In the course of its work, because the aluminum melt at 750 ℃ viscosity and 20 ℃ when the water viscosity is quite close, so that it easily penetrate into the lining and the occurrence of chemical reactions; in the aluminum liquid contact with the refractory, refractory Materials such as SiO2, TiO2, FeO and other oxides are easily reduced by aluminum, so that the surface of the lining of the tumor, drums and sedimentation debris; furnace operation process, the furnace metal liquid kept churning and stirring, the lining of the continuous erosion and Wear, by the aluminum liquid impregnated part of the emergence of penetration, the risk of cracking, shutdown will cause peeling. Therefore, the lining material in contact with the aluminum liquid must have a high thermal stability and as little as possible the amount of impregnation, and also requires a high mechanical strength and hardness.Refractory Materials

Modern electrolytic aluminum production using cryolite - alumina melting salt electrolysis method. Molten cryolite is a solvent, alumina as a solute, the carbon body as an anode, aluminum liquid as a cathode, into a strong DC, at 900 ℃ -1000 ℃, in the electrolysis of the two electrodes on the electrochemical reaction, So that the electrolyte and aluminum to maintain the molten state, from time to time from the tank to release aluminum liquid, and to the tank by adding a certain amount of alumina and cryolite. As the electrolysis process by adding cryolite and other electrolytes can not be fully electrolyzed, the excess part and the melt above the gas phase will cause serious erosion of refractories.Refractory Materials