METHOD OF DECREASING FLUORINE ELUTION FROM STAINLESS DIFFERENTIATION SLAG

摘要

A method of decreasing fluorine elution from the slag by adding ammonium chloride to slag generated in a powder phase in the refining process of the stainless steelmaking process and reacting a mixture of the ammonium chloride and the slag with carbon dioxide gas, thereby forming a calcium carbonate coating layer on a surface of the slag is provided. A method of decreasing fluorine elution from pulverized stainless steel slag comprises adding an aqueous ammonium chloride(NH3Cl) solution to slag and reacting a mixture of the aqueous ammonium chloride solution and the slag with carbon dioxide to form a calcium carbonate(CaCO3) coating layer on a surface of the slag. The aqueous ammonium chloride solution has a concentration of 5 to 10%. The aqueous ammonium chloride solution has a water content of 5 to 20% relative to the slag. The method comprises reacting the slag with the carbon dioxide for at least 120 minutes.