METHOD FOR DEPHOSPHORIZATION TREATMENT IN EAF LIQUID STEEL

摘要

PURPOSE: A method of treating post-phosphorus in a blast electric furnace is provided to activate the slag forming and to lower the density of a phosphorus in end of the line as promoting the assistant material ashed along with securing the heat source of an electric furnace by injecting a slag of high temperature, generated in a deoxidized steel, into an electric furnace. CONSTITUTION: A method of treating post-phosphorus in a blast electric furnace comprises : a step of first charging ; a step of first smelting to add quicklime into a first smelting tool ; a step of adding a slag of high temperature generated in an aluminum post-oxygen steel ; a step of second harging ; a step of second smelting to add quicklime and dolomite into a second smelting tool ; a step of refining. And a basicity(CaO/SiO2) of liquefied slag is four or more, the sum of CaO and Al2O3 is more than 70%, and the density of SiO2 is less than 10%.