Kawasaki Steel Corporation

Denka Consultant and Engineering Co., Ltd.

Hitoshi Morishita

Fumio Sudo

Hajime Bada

Sumio Yamada

Shuzo Fujii

Hideo Miwa

Yoshiro Tomiyama

Mikio Kodaka

Masaaki Yamanashi

Disclosed herein is a flow change-over valve for the blowing of fluids into a molten metal vessel, which includes a housing provided with at least three inlet ports for different fluids and an outlet port, a valve body with a main passage communicating selectively between one of the inlet ports and the outlet port and rotatably supported in the housing to perform the changing-over of inlet passages. Among these inlet ports, an inlet port for purging fluid is opened in the housing, and a shroud-like gap surrounding the valve body is formed between the inner periphery of the housing and the outer periphery of the valve body in such a manner that it communicates with the inlet port for the purging fluid disposed in the housing and is always to be communicated with an opening of an inlet port of the main passage during the changing-over through the rotation of the valve body.

Flow change-over valve for the blowing of fluids into molten metal vessel

Injection-desulfurization of a molten iron is carried out in a low cost by using powdery CaCO.sub.3 obtained by pulverizing limestone as a desulfurizing agent. This injection-desulfurization also can be attained by using a powdery mixture in which a main ingredient is said powdery calcium carbonate and not more than 30% by weight of powdery quicklime is added thereto, a powdery mixture in which a main ingredient is said powdery calcium carbonate and 5.about.20% by weight of a carbonaceous material and 2.about.15% by weight of at least one of halides of alkali and alkaline earth metals are added thereto, or a powdery mixture in which a main ingredient is said calcium carbonate and 5.about.20% by weight of a carbonaceous material, 2.about.15% by weight of at least one of halides of alkali and alkaline earth metals and not more than 30% by weight of powdery quicklime are added thereto, as the desulfurizing agent.

Method for desulfurizing a molten iron by injection

Method of recovering CO-rich exhaust gas in refining of metal

A method of dephosphorizing molten pig iron, wherein molten pig iron is charged into a refining vessel provided at its bottom with tuyeres for blowing gas and, if necessary, at its top with a gas injecting member, and a powdery refining agent together with the blowing gas is blown into molten pig iron through the tuyeres, while a flux for the refining agent is charged into the refining vessel to perform desiliconization and subsequent dephosphorization of molten pig iron, is disclosed. This method comprises

Method of dephosphorizing molten pig iron

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Chiba, Japan

Hitoshi Morishita