Research on Carbothermic Reduction for Dephosphorization from Converter Slag by Microwave Heating

The carbothermic reduction experiments of converter slag were carried out by microwave heating under nitrogen atmosphere. The effects of reduction temperature,carbon equivalent,granularity and reduction time on the phosphorus distribution in slag,iron and gas phase were studied.Results show that pyknotic Fe-C-Mn-P iron bead can be obtained by carbothermic reduction of converter slag by microwave heating. With the increase of reduction temperature,carbon equivalent and the extension of reduction time,the phosphorus into iron and gas phase increases,and the phosphorus in residue decreases. With the decrease in particle size of the steel slag,the phosphorus into iron increases,and the phosphorus in residue and gas phase is decreased. XRD and SEM/EDS analysis of the residue evidences that there is no phosphorus in the residue. This research can lay the basis for the efficient utilization of converter slag.