EFFECT OF CaO/CaF_2 ADDITION ON MAGNESIUM PRODUCTION FROM DOLOMITE ORE BY THE SILICOTHERMIC REDUCTION PROCESS

摘要

Reduction of magnesium oxide, present in dolomite ore, was carried out under an inert atmosphere by using ferrosilicon as reductant (silicothermic process). The effect of additions of both calcium oxide and calcium fluoride on the reduction of magnesium oxide was studied. The presence of these additives in certain ratios increased the recovery of magnesium from 43 percent to 95 percent at 1300 deg C. the role of these additives, the mechanism and the kinetics of the silicothermic process have been discussed.