DEPHOSPHORIZATION OF SILICO-MANGANESE ALLOYS UNDER REDUCING ATMOSPHERE WITH METALLIC CALCIUM

Dephosphorization of silico-manganese ferroalloy with metallic Calcium was investigated under sealed and open conditions. Effects of the ini tial Si content in silico-manganese melts, the adding amount of Ca chi ps and flux CaF2, the time of dephosphorization and the initial C cont ent in silico-manganese melts upon dephosphorization efficiency were a scertained by experiment. The dephosphorization product was identified as Ca3P2 upon stoichiometric composition. Experimental results show t hat dephosphorization efficiency, rather high, from 95 % to 99 % could be obtained by adding Ca under sealed conditions and a high Ca utiliz ation ratio was obtained.