Kawasaki Steel Corporation

Kawasaki Steel Corporaton

Kawasaki Limited

Shigeru Ogura

Naoki Kikuchi

Masayuki Onishi

Shuji Takeuchi

Mototatsu Sugizawa

Yuji Miki

Toshikazu Sakuraya

Hideo Kuguminato

Saburo Moriwaki

Masuto Shimizu

Masaru Washio

Noboru Yasukawa

Hidenari Kitaoka

Kazuhisa Hamagami

Yoshiro Tomiyama

Yuki Nabeshima

Motoyasu Yaji

Masaaki Tsukamoto

Hitoshi Ohsugi

Mitsuru Sakurai

Tadashi Morimoto

Takao Suzuki

Nobuhiko Morioka

Yozo Tanino

Tsukasa Terashima

Masaru Shibata

Akiharu Takao

Desulfurization is carried out by blowing CaO into molten iron, and a gas mixture of an inert gas and a hydrocarbon gas is used as a carrier. The ratio of the hydrocarbon gas to the desulfurizing agent is maintained in the range of from about 2.0 to about 50 Nl/kg. This desulfurizing method improves the desulfurization efficiency of the desulfurizing agent, increases the productivity of the desulfurizing process, and reduces the amount of slag generated in the desulfurizing process. Alternatively, a desulfurizing flux is blown into the molten iron together with a carrier gas comprising a gas mixture of an inert gas and a hydrocarbon gas or an inert gas alone at the start of desulfurization. The hydrocarbon gas in the carrier gas is increased, is added, or the unit gas is replaced by the hydrocarbon gas at adequate timing, whereby the desulfurization efficiency is improved.

Method of desulfurizing molten iron

A process for desulfurizing a molten iron alloy in which a desulfurizing agent is applied to the molten iron alloy under agitation. Concurrently, a gas containing a hydrocarbon gas is blown onto the bath surface of the molten iron alloy, or a substance generating a hydrocarbon gas is added to the bath surface.

Method of desulfurizing molten iron alloy

System for removing non-metallic foreign matter in molten metal

Process for detecting outflow of slag

A process for fusing a steel slab in a longitudinal direction thereof is disclosed, wherein when the steel slab is fused in the longitudinal direction at more than 500.degree. C. and at a speed of more than 300 mm/min., a surface portion of the slab including at least a lower portion of a longitudinally fused surface portion thereof is mechanically removed by cutting or grinding.

Process for fusing steel slabs in longitudinal direction thereof

A method of repairing a refractory lining of a vessel lined with refractory by flame gunning process, in which a patching material consisting of refractory particles and carbonaceous fuel powder is flame-gunned together with an oxygen containing gas to fuse or semi-fuse the refractory particles in a region surrounded by high-temperature flame and struck against the surface of the refractory lining to produce a deposit layer of the refractory particles, is disclosed. In this method, a patching material having a higher mixing ratio of the fuel powder or only the fuel powder is flame-gunned at an initial stage of the repairing and subsequently patching materials, in which the mixing ratio of the fuel powder is lowered stepwise, are flame-gunned in order with the progress of the repairing, during which a blow rate of the oxygen containing gas is controlled in accordance with the change of the mixing ratio of the fuel powder in the patching material.

Flame gunning of refractory linings

Growing community of inventors

Chiba, Japan

Shigeru Ogura