Nippon Steel Corporation

De Nora Permelec Ltd

Chlorine Engineers Corp., Ltd.

Masahiro Ohara

Katsuhiro Minamida

Akiyoshi Manabe

Shigeru Nishibayashi

Teruki Hayashida

Atsushi Sugihashi

Terumi Matsuoka

Hiroki Domon

Rokuro Kohno

Tadatsugu Yoshida

Yoshinori Nishiki

Tatsuo Yokoi

Masaaki Kato

Takamichi Kishi

Takaaki Nakamura

Katsuhiro Maeda

Akira Kunimatsu

Seiji Arizumi

Yoshitsugu Shinomiya

Tsuneo Tokumori

Shinji Matsuo

Masakazu Abe

Hiroki Kato

Keiji One

Izumi Kawamura

Kouichi Tsuchihashi

To provide a method and an apparatus for producing a sodium hypochlorite solution on-site at a high efficiency and at the initial cost and suppressing operating cost without any problems about impurities derived from raw material water and raw salt. A method of producing a sodium hypochlorite solution on-site in the vicinity of a physical plant where a sodium hypochlorite solution is used. In production of a sodium hypochlorite solution by feeding secondary salt water, in an electrolyzer comparted into an anode chamber and a cathode chamber with an ion-exchange membrane, to the anode chamber and allowing components in the anode chamber and the cathode chamber after electrolysis to react in a reaction tank, there are included respective steps of treating raw material water A with a cation-exchange resin B to generate purified water, dissolving raw salt D in the purified water to generate primary salt water E, performing an examination for confirming the presence or absence of a precipitate or suspended solid in the primary salt water, and directly performing chelating in the case of no precipitate or suspended solid contained in the primary salt water, or performing chelating after addition of an acid component for dissolution of the precipitate or suspended solid in the case of the precipitate or suspended solid contained therein, to generate secondary salt water

Method and device for manufacturing sodium hypochlorite solution

Provided is an electrolytic apparatus capable of pressurizing hydrogen gas produced by the electrolytic apparatus and removing impurities in the produced hydrogen gas. In the electrolytic apparatus, gas compression meansincluding an ejector, a storage tankstoring a circulation liquid, a circulation pipecirculating a fluid mixture of hydrogen gas and the circulation liquid to the ejector, and a circulation pumpis provided in a discharge linefor hydrogen gas produced by electrolysis, a hydrogen gas discharge pipeand a first valve Vare provided in the storage tank, impurities in the hydrogen gas are transferred to the circulation liquid to remove the impurities from the hydrogen gas, and a pressure of the hydrogen gas stored in the storage tankis raised by controlling a flow rate of the circulation liquid circulated from the storage tankto the ejectorand opening and closing of the first valve V

Electrolytic device

To provide an electrolytic apparatus and an electrolytic method which can remove a risk of reaching an explosion limit of hydrogen by gradual accumulation of a very small amount of gas in a circulation line of an electrolytic solution in an electrolytic process generating hydrogen. The electrolytic apparatusis characterized by including an anode gas feeding lineconnecting a gas phase regionto an anode side gas-liquid separation means in order to dilute the concentration of the hydrogen gas by feeding anode gas into the gas phase regionin which hydrogen gas can exist as a gas phase. By feeding at least a part of the anode gas to the gas phase regionwith the anode gas feeding line, the hydrogen gas in the gas phase regionis diluted with the anode gas so that the concentration of the hydrogen gas is surely less than a lower limit value of explosion limit.

Electrolysis apparatus and electrolysis method

The present invention relates to a method for treating tritium water-containing raw water, the method including supplying a part of raw water containing tritium water and alkali water to a circulation tank, mixing the raw water with alkali water in the circulation tank to obtain an electrolyte adjusted so as to have a desired alkali concentration, and continuously electrolyzing the electrolyte while circulating the electrolyte, thereby subjecting the raw water stored in the storage tank to alkali water electrolysis and thus gasifying the raw water. According to the invention, by gasifying tritium water-containing raw water by alkali water electrolysis, the tritium concentration in a tritium-containing hydrogen gas is diluted to 1/1,244 and the tritium water-containing raw water can be reduced in volume.

Method for treating tritium-water-containing raw water

A three-dimensional electrode with higher strength and higher toughness is provided. The three-dimensional electrode is fabricated by bending a plurality of snicks which are formed in a plate-like electrode substrate toward the same direction. The stabilization of the positional relation among the elements generated by the three-dimensional electrode neither mechanically damages the membrane nor causes the insufficient current supply. The three-dimensional electrode is preferably used for brine electrolysis and white liquor electrolysis.

Three-dimensional electrode for electrolysis, ion exchange membrane electrolytic cell and method of electrolysis using three-dimensional electrode

The present invention provides a high strength hot rolled steel sheet raised in Si content, wherein a conversion coating can be formed homogeneously over the entire surface of the steel sheet, no new step is added in the production of the steel sheet, and quality control is also facilitated, comprising, by mass %, C: 0.03 to 0.15%, Si: 0.8 to 3.0%, Mn: 0.5 to 3.0%, P: 0.07% or less, S: 0.01% or less, Al: 0.015 to 0.1%, N: 0.001 to 0.008%, and, if necessary, having Ti, Nb, etc. added, the oxides on the steel sheet surface having an Si concentration of 3.5% or less and an Mn concentration of 3.5% or less. Preferably, the average roughness Ra is 3.0 &#x3bc;m or less and the pitting due to pickling is an average of 5 or less in 10 &#x3bc;n side squares. The scale after the hot rolling is washed off by dipping the sheet in a solution having an HCl concentration of 7 to 15% and an Fe ion concentration of 4 to 12% at a solution temperature of 80 to 98&#xb0; C. for 40 sec or more.

Hot rolled steel sheet excellent in chemical convertibility and method of production of the same

The present invention provides high burring, high strength steel sheet excellent in softening resistance of the weld heat affected zone and a method of production of the same, that is, high burring, high strength steel sheet excellent in softening resistance of the weld heat affected zone containing, by wt %, C: 0.01 to 0.1%, Si: 0.01 to 2%, Mn: 0.05 to 3%, P&#x2266;0.1%, S&#x2266;0.03%, Al: 0.005 to 1%, N: 0.0005 to 0.005%, and Ti: 0.05 to 0.5% and further containing C, S, N, Ti, Cr, and Mo in ranges satisfying 0%&#x3c;C&#x2212;(12/48Ti&#x2212;12/14N&#x2212;12/32S)&#x2266;0.05%, Mo+Cr&#x2267;0.2%, Cr&#x2266;0.5%, and Mo&#x2266;0.5%, the balance being Fe and unavoidable impurities, wherein the microstructure comprises ferrite or ferrite and bainite.

High burring, high strength steel sheet excellent in softening resistance of weld heat affected zone and method of production of same

In removal of sulfate groups and chlorate groups from brine used for electrolysis, concentrated brine used in an electrolysis process or dilute brine whose concentration is decreased by electrolysis is fed to an anode chamber divided by a cation exchange membrane in a brine treating electrolyzer, where the concentrated or dilute brine is electrolyzed to recover chloride ions therein. The concentrated brine is electrolyzed at a rate of decomposition of salt higher than that in the ion exchange membrane electrolysis process of brine. Thereafter, the concentrated or dilute brine is discharged out of the electrolysis process.

Method for removal of sulfate groups and chlorate groups from brine

Continuous hot rolling method

Sheet bars are effectively joined while they are traveling and subjected to continuous hot rolling without causing defects in quality and without requiring large expensive apparatus such as a swing roller etc. The present invention is to provide a continuous hot rolling method and apparatus in which the tail of a preceding sheet bar is butted to the top of a succeeding sheet bar between the rough and finishing mills on a continuous hot rolling line, and the butted portion is welded from the upper surface of the sheet bars by means of laser beam or plasma arc while the sheet bars are traveling. According to the present invention, it is possible to join sheet bars from the upper surface in a short period of time without stopping the sheet bars and without causing splashes and burrs, before the sheet bars are subjected to continuous finish rolling. Since the welded apparatus does not interfere with the sheet bar conveyance table, hot strips of high quality can be effectively manufactured by the economical apparatus.

Method of continuous hot rolling and apparatus for welding steel bars

Apparatus for welding steel bars in a continuous hot rolling process

In a brine treatment method of removing sulfate ions from sulfate-ion contained brine, sulfate-ion contained brine is brought into dispersive contact with granular ion exchange resin carrying zirconium hydrous oxide thereon in a fluid state under an acidic condition to thereby cause the sulfate ions to be adsorbed by the ion exchange resin and removed from the brine, then the granular ion exchange resin is washed with aqueous solution whose pH value is equal to or lower than a pH value in the adsorbing step, thereby removing chloride ions from the granular ion exchange resin, then in a fluid state, the granular ion exchange resin adsorbing the sulfate ions is brought into dispersive contact with aqueous solution of pH value higher than the pH value in the adsorbing step, thereby desorbing the adsorbed sulfate ions from the granular ion exchange resin, and then the granular ion exchange resin is washed with water.

Brine treatment method

Growing community of inventors

Tamano, Japan

Masahiro Ohara