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2011-Sustainable Industrial Processing Summit
|Flogen Star OUTREACH
|2291-1227 (Metals and Materials Processing in a Clean Environment Series)
In spite of the various benefit of fluorspar use in BOF operation such as increasing refining capacity of slag and powerful fluxing ability, environmental problem of fluorine has enforced steelmaking companies to develop its substituting materials. In the present study, it is proposed to utilize slag from ferroalloy production as fluorspar substituting material and results of plant trial are introduced. Significant quantities of slag from ferroalloy production are generated and so far they are considered as waste material though they usually contain considerable quantities of valuable metals and materials. The physical and chemical characteristics of several kinds of slag from ferro-manganese production are investigated. Considering all aspects when being used as substitutes of fluorspar, FeMn refining slag which is generated from the production of low or medium carbon grade ferro-manganese was chosen as a fluorspar substituting material. It has a low melting point less than 1250℃, high MnO content up to 35% and low P and S content. It is applied to converter operation so that 3 to 7 kg FeMn refining slag per ton of liquid steel was added into 100 ton capacity of converter several times during blowing. From the result of plant trial, more than 70% of fluorspar consumption was decreased and additionally 0.03~0.08% of manganese content in molten steel increased.