In the non-ferrous industry, the production of aluminum ranks first in the world, and it is also the largest consumption of refractory materials. Aluminum production requires the extraction of industrial alumina from bauxite, which is then used as a raw material to produce aluminum metal. The process of aluminum electrolysis production is by the method of molten salt electrolysis using cryolite alumina. Molten cryolite is the solvent, alumina as the solute, carbonaceous body as the anode, aluminum liquid as the cathode, pass into a strong direct current, at 950 ° C - 970 ° C, in the electrolytic tank on the two poles to carry out the electrochemical reaction, that is, electrolysis.
The main thermal equipment for smelting aluminum is forging rotary kiln, carbon roaster, electrolysis tank, molten aluminum furnace and so on. The refractories required for different hot work equipment are also different, and the common products are: clay bricks, lightweight insulation bricks, high alumina bricks, phosphate high alumina bricks, mullite bricks, corundum bricks, mullite constables, non-stick aluminum castables and so on.
The main mechanism of refractory damage in aluminum melting furnace is as follows:
Solution:
By adjusting the particle size of ultrafine powder, the particle size distribution and type of bee species, and adopting methods such as layering and dense stacking, the porosity of the castables can be reduced to less than 10%, while the required cut hole distribution is only 0.5 microns, and the average pore distribution is 22 microns when conventional phosphoric acid or aluminum phosphate is used as a binding agent; in general, it is very difficult for aluminum to penetrate the holes of less than 0.5 microns, so low-cemented castables will replace the conventional phosphates refractories as binding agent;
