BLOWING LANCE FOR REFINING, BLOWING LANCE APPARATUS FOR REFINING, METHOD OF DESILICONIZING OF MOLTEN IRON, AND METHOD OF PRETREATMENT OF MOLTEN IRON

WIPO Patent Application WO/2007/100113

A1

A gas blowing lance (1) for blowing oxygen gas into a molten metal. It has a double-tube structure comprising an inner tube (2) and an outer tube (3). Oxygen gas is blown through the inner tube, and a hydrocarbon gas is blown through the space between the inner tube and the outer tube. An Al2O3-MgO monolithic refractory having an MgO content of 5-30 mass% is used as a refractory coating layer for at least a blowing end part of the outer periphery of the outer tube. The lance hence has high durability and can be used more times than conventional ones. It contributes to a reduction in production cost. Also provided is a method of the desiliconizing of molten iron which uses the blowing lance.

KIKUCHI NAOKI (JP)
HINO YUTA (JP)
NABESHIMA SEIJI (JP)
TAMIYA KENICHIRO (JP)
YAMAUCHI TAKASHI (JP)
OKADA KOJI (JP)
TANAKA YOSHIYUKI (JP)
SHIMIZU HIROSHI (JP)

PCT/JP2007/054109

September 07, 2007

February 26, 2007

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JFE STEEL CORP (JP)
KIKUCHI NAOKI (JP)
HINO YUTA (JP)
NABESHIMA SEIJI (JP)
TAMIYA KENICHIRO (JP)
YAMAUCHI TAKASHI (JP)
OKADA KOJI (JP)
TANAKA YOSHIYUKI (JP)
SHIMIZU HIROSHI (JP)

C21C7/072; C04B35/66; C21C1/04

JPH1112637A	1999-01-19
JPH07242926A	1995-09-19
JPH07223874A	1995-08-22
JPH11171656A	1999-06-29
JPH0499115A	1992-03-31
JPH10140224A	1998-05-26
JPH08209220A	1996-08-13

OCHIAI, Kenichiro (JFE TECHNO-RESEARCH CORPORATION 7th Floor Yanagiya Building, 1-10, Nihonbashi 2-chom, Chuo-ku Tokyo 27, JP)

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