Title: Treating agent for desulfurizing molten steels and method for treating molten steels
Application Number: 86102210 Application Date: 1986.03.03
Publication Number: 1006098 Publication Date: 1986.12.24
Approval Pub. Date: 1989.06.21 Granted Pub. Date: 1989.06.21
International Classifi-cation: C21C7/064
Applicant(s) Name: Nippon Steel Corp. Address:
Inventor(s) Name: Hideo Yaoi;Kouichi Endou;Seiji Asao
Attorney & Agent: DUAN CHENGEN XU RUXUN
Abstract:
    A treating agent of molten steel according to the present invention is used for desulfurization molten steel for desulfurizing it in a reaction vessel which is lined with a basic refractory containing MgO, and consists of CaO, CaF2 and MgO and unavoidable impurities contains from 10 to 60% by weight of MgO, and has a weight ratio of {(CaF2)/((CaO) (CaF2))}*100(%) of from 20 to 80%. Said agent is injected with the aid of inert carrier gas into the molten steel and floats toward a portion of the molten steel bath essentially free of slag. Another treating agent essentially consisting of CaO and CaF2 may be also injected prior and/or subsequent to injection of said agent, so as to decrease inclusions. The inert gas may also be injected after injection of said agent(s).
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