METHOD FOR DEPHOSPHORIZING MOLTEN IRON BY BLOWING SLAG FORMING AGENT INTO MOLTEN IRON BATH

摘要

PURPOSE:To dephosphorize effectively molten iron by blowing only a slag forming agent for dephosphorization into the molten iron at a specified depth from the surface of the molten iron bath through a lance with an inert gas and by adding an oxidizing agent to the surface of the bath at the same time. CONSTITUTION:A slag forming agent 7 for dephosphorization is blown into molten iron 2 in a molten iron ladle 1 at =500mm. depth from the surface of the molten iron bath through a lance 4 with an inert gas 6 as a carrier gas. At the same time, an auxiliary slag forming agent 9 and an oxidizing agent 8 are added to the surface of the bath. The granules of the blown slag forming agent 7 diffuse in the molten iron 2 and rise to the surface of the bath while being heated. The granules become an active state and react efficiently with P2O5 formed by the reaction of the oxidizing agent 8 with phosphorus in the molten iron 2. The P2O5 is fixed in slag 3.