METHOD FOR DEPHOSPHORIZING MOLTEN IRON IN CONVERTER BY REUSING DEPHOSPHORIZED SLAG

摘要

PROBLEM TO BE SOLVED: To provide a dephosphorizing method of molten iron in a converter with which lime contained in dephosphorized slag can effectively be utilized, a quantity of auxiliary raw material can be reduced and a discharged quantity of slag can be reduced by recycling the slag. SOLUTION: In the converter having a top-bottom blowing facility, refining condition is adjusted by reutilizing the dephosphorized slag in the cold state and/or the hot state, and the dephosphorized slag in which phosphoric acid concentration in the converter slag is =20% is reutilized at one or more times.