METALLOTHERMIC PROCESS FOR MAGNESIUM PRODUCTION AND VACUUM-INDUCTION FURNACE THERETO

摘要

METALLOTHERMIC PROCESS FOR MAGNESIUM PRODUCTION is based on heating the batch mixture of calcined dolomite and ferrosilicon up to temperature of about 1200<°>C under residual pressure less than 670 Pa and condensing the magnesium vapor. To increase magnesium extraction, a batch mixture of fine­-dispersed at least partially calcined dolomite consisted of particles of no more than 0.1 mm and low-silicon ferrosilicon is loaded into VACUUM-INDUCTION FURNACE having electroconductive crucible equipped with at least one additional electroconductive heater within heating area and cooling condenser on upper end. Each loaded batch mixture is calcined in good time at temperature of about 900<°>C under atmospheric pressure, then said furnace is closed and, after vacuuming, heated at temperature sufficient for beginning the metallothermic process, which is carried out on conditions that heat is supplied into volume of said charge.