Nippon Steel Corporation

Matsushita Electric Works, Ltd.

Kawaso Electric Industrial Co., Ltd.

Yozo Takemura

Tamio Noda

Hiroyuki Nakashima

Yoshikatsu Ikari

Masao Yashiro

Tadashi Morita

Toshihiko Shibata

Osamu Takamori

Eisuke Akiyoshi

Kenji Watanabe

Taizo Kawamoto

Yasuhiro Akita

Norio Mikami

Atsushi Mori

Kaoru Kato

Hiroshi Matsukubo

Kaname Ohno

Yoshitsugu Sakagami

Kengo Senco

Isao Kobayashi

Kouich Hirayama

Masaru Meguro

Futoshi Matsuo

Yoshiyuki Kikuci

Method and apparatus for treating effluent containing organic chlorine

Composition having strong air cleaning ability and method of preparing

A component for deodorizing air or gas having a coexist compound as a deodorizing element, said coexist compound comprising a metal and a reaction product of the metal and an acid, wherein the metal is selected from at least one of Fe, Mn, Cr, Ni, Zn, Al and Cu, and the acid is selected from at least one of ascorbic acid, gluconic acid, citric acid, tartaric acid, tannic acid, gallic acid, EDTA and malic acid, wherein clean air or gas is passed through the deodorizing element to restore its deodorizing effect after a period of time sufficient for the deodorizing element to lose its deodorizing power.

Component for deodorizing air and other gases

Composition for gas purification and method of preparing same

In bottom blown oxygen steel making or in top and bottom blown combined oxygen steel making, a tip end of a tuyer immersed in molten steel is seriously damaged or melted away due to very high temperatures due to the vigorous combustion of carbon, manganese and so on by the oxygen blown into a furnace. In order to prevent such damage, hydrocarbon gas has been blown through space between an outer pipe and an inner pipe of a dual pipe tuyere or tuyeres, but such hydrocarbon gas rather excessively lowers the temperature of the molten metal adjacent to the tip end of the tuyere and often blocks the opening of the tuyere. Now, instead of blowing in hydrocarbon gas, particulate material such as limestone magnesite, dolomite and the mixture thereof are proposed to be blown into the molten metal in the decarburization steel making vessel carried by an innert gas, combustion gas, blast furnace gas, LD process gas and oxygen or a mixture of these gases. Particulate material mentioned above, when blown into the molten metal, increases the momentum of the gas flow, enhances a shielding effect, against high radiation heat by fire point, or further forms either a kind of protective layer or deposit of refractory mineral material at the tip of the tuyere thereby effectively preventing damage of the tuyere and lengthens the service life of the refining vessel. Addition of particulate material in continuously linearly or in stepwise manner has been proved to be effective for accomplishing the above-mentioned cooling and protecting effect of the particulate material.

Method of preventing damage of an immersed tuyere of a decarburization

An apparatus for determining carbon contents in molten metal comprising an entrance chamber with an entry port in a side wall, a sampling chamber, a ring-shaped disk to be set between both chambers and a temperature sensing means which is protected from the flowing sample metal by a protective thermal insulation member, protruding through the entrance chamber to the sampling chamber. The molten metal flowing from the entry port is cooled by contacting with the protective thermal insulation member. The insulation member will turn to be a riser when the sample metal starts solidifying in the sampling chamber. Thus enabling precise rapid carbon determination and simultaneously offering appropriate specimen for spectrographic analysis.

Apparatus for determining carbon contents in molten metal

A method for changing a steel slab width during continuous casting of the steel slab, which comprises moving at least one side member of a mold at a speed not higher than 2.0 mm/second during the continuous casting.

Method for changing width of cast slabs during continuous casting

An improved measuring lance to be inserted into a bath of molten metal, for example, molten steel, is disclosed having thermocouples on its tip end and in its receptacle chamber, respectively. The lance is provided with means to discharge air from inside a cover for a thermocouple in a receptacle chamber. A deoxidation chamber made of steel may be provided in the lance. Means to spray gas from around the connector of the lance may also be provided. These means assure accurate measuring of the temperature, composition, etc. of the bath.

Measuring lance for molten metal such as steel

Growing community of inventors

Tokyo, Japan

Yozo Takemura