The bauxite, as a kind of refractory, could stand for over 2000oC, so we must use electric arc melting to fuse it, by applying low voltage and strong current. The fusing voltage should range from 85V to 130V and the temperature should be over 2200oC. Then the melt mineral liquid forms spherical particles, through the blow of high-pressure air. The pressure of air should be 0.4MPa – 0.5MPa. In the cooling process of forming spherical particles, to avoid cooling pressure, we use slowing cooling and change the structure of the nozzle, so we could get expected size distribution.
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