Behavior of Carbothermal Dephosphorization of Phosphorus-Containing Converter Slag and Its Resource Utilization

Phosphorus-containing converter slag is a common waste in the iron and steel industry, has characteristics of high generation low secondary-utilization values; however, high-phosphorus content limits its ability to be recycled during steelmaking process. In this study, dephosphorization behavior by carbothermal reduction was studied through experiments thermodynamic calculations. The results showed that gas product produced mainly P2, part P2 entered phase generate phosphate compounds. With increase Fe content, amount also increased, which may provide suitable new direction for production ferrophosphorus. Based on theory, “circulating process gasification” proposed applied Chengde Iron Steel Group Co., Ltd. (Chengde, China). industrial practice did not affect effect next furnace, average iron, steel, slagging-material consumption per furnace reduced 4.74 kg 608 kg, respectively. CO2 emissions were 4.86 thus achieving goals energy saving, environmental protection, efficient dephosphorization.