Kawasaki Steel Corporation

Hitachi, Ltd.

Amsted Industries Inc.

Osaka Sanso Kogyo Ltd.

Kawasaki Steel Company

Tetsuya Fujii

Nagayasu Bessho

Toshikazu Sakuraya

Kenichi Sorimachi

Tsutomu Nozaki

Yoshiei Kato

Yasuhiro Habu

Hirokazu Tozawa

Shuji Takeuchi

Yukio Oguchi

Saburo Moriwaki

Seiji Itoyama

Toshihiko Emi

Noboru Yasukawa

Hideo Nakamura

Tomoaki Kimura

Yuji Miki

Fumio Sudo

Hakaru Nakato

Seiji Taguchi

Seiko Nara

Toshio Fujimura

Arata Ueda

Akira Idogawa

Norio Sumida

Nobuo Harada

Naomichi Nakamura

Shigeki Hayashi

Nozomu Tamura

Yoshiaki Hara

Sumio Yamada

Yasuhiko Sakaguchi

Makoto Aratani

Hiroshi Itaya

Akihiko Nanba

Hidenari Kitaoka

Hiroyuki Baba

Takuo Imai

Noriyoshi Yuge

Tadasu Kirihara

Mitsuo Saito

Motoyasu Yaji

Kazuhiro Hanazawa

Yoshiro Tomiyama

Takeshi Shiraishi

Seiji Watanabe

Masamichi Abe

Hisao Yamazaki

Mitsuru Sakurai

Michio Suzuki

Kenichi Orito

Kanji Emoto

Shigeo Matsui

Tsuyoshi Nakamoto

Hisao Yamasaki

Shigeru Omiya

Masahito Suito

Seikou Nara

Shoji Miyagawa

Isamu Goto

Norio Sumita

Masaaki Kuga

Method for producing highly purified silicon for use in solar cells by a single solidification purification, pouring silicon into a mold and gradually fractionally solidifying it while solidifying the liquid surface, followed by purifying the solidified silicon by zone melting or continuous casting using an electromagnetic mold, or by zone melting in combination with continuous casting, and optionally causing directional solidification to concentrate impurities, leaching and recycling.

Method for producing silicon for use in solar cells

Method and apparatus for collecting valuable products, particularly zinc, from a zinc-containing substance such as electric furnace dust. A shaft type smelting reduction furnace has a packed bed of a carbonaceous solid reducing agent and has upper and lower tuyeres, and a zinc-containing substance is injected through tuyeres to reduce and vaporize zinc, which is directly contacted by a liquid coolant thereby forming a slurry, and the zinc product is collected from the slurry.

Method of treating zinc-containing substance

Method of continuously casting steels

Process of continuously casting steel using electromagnetic field

One or more streams of molten metal poured into a continuous casting mold are acted on magnetically by static magnetic fields, covering substantially the entire width of the casting mold, thereby reducing the speed of the molten metal streams from the immersion nozzle, unifying the flow profile of the molten metal in the mold, preventing trapping and accumulating of mold powders and inclusions into the cast products. Magnetic poles are provided which are at least as wide as or wider than the minimum width of the cast products and the iron core is arranged on the same face of the casting mold with mutually opposite polarities in the drawing direction. Even if casting conditions change from time to time, defects in final products made of the cast metal are substantially reduced.

Apparatus and method for continuous casting

An apparatus and method for continuous casting steel. A vertical continuous-casting mold consists of a pair of long side frames and a pair of short side frames formed of a metal having low electrical conductivity. An immersion nozzle supplies molten steel to the mold. An induction heating coil surrounded by a backup frame surrounds the vertical continuous-casting mold. The induction heating coil induction-heats the surface of the molten steel and neighboring portions thereof. The apparatus meets the following conditions;

Apparatus and method for continuous casting of steel

Disclosed is a method of refining of a high purity steel capable of effectively lowering impurities in molten steel into respective ultra-low ranges. In secondary refining for molten steel after a molten iron prerefining process and a converting process, a reducing agent and a flux are added on the bath surface within a ladle containing the molten steel decarburized in a converter so that the composition of slag on the bath surface is adjusted in such a manner that the total concentration of FeO and MnO becomes 5 wt % or less, and subsequently, impurities in the molten steel are effectively lowered into respective ultra-low ranges using a RH vacuum degassing unit.

Method of refining of high purity steel

In a continuous casting of steel slab, a molten steel is provided having an oxygen concentration of not more than 35 ppm and is supplied from a tundish into a continuous casting mold through a straight immersion nozzle having an open end at the forward end thereof, the mold consisting of a combination of a pair of narrow face mold walls and a pair of wide face mold walls. A traveling magnetic field generating device is disposed on a central area of the outer surface of the wide face mold walls. While the open forward end of the nozzle is positioned in the magnetic field region of the traveling magnetic field generating device, a traveling magnetic field which is perpendicular to the wide face mold walls and which is traveling upward is applied to a flow of the molten steel discharged from the nozzle, thereby controlling the flow. Preferably, an upper or lower static magnetic field generating device or both of them may be also used.

Continuous casting method of steel slab

A method of removing non-metallic inclusions from a molten metal by allowing the molten metal to pass through at least first and second vessels which are intermediate between a ladle and a mold. The molten metal is made to stay in the vessel for a period not shorter than 40 seconds while a horizontal rotation is imparted to the molten metal in the first vessel. The molten metal is then transferred from the first vessel to the second vessel. The molten metal in the second vessel is then heated. This method is suitably carried out by an apparatus comprising a first vessel having a discharge opening at its bottom and surrounded by a rotational magnetic field generating device for centrifugation of the molten metal in the first vessel, and a second vessel for receiving the molten metal discharged from the first vessel and provided with a heating device for heating the molten metal received therein.

Method of and apparatus for removing non-metallic inclusions in molten

Spray coating is performed utilizing a mixture of refractory material and a combustionable metal powder. The size of the particle of the metal in the mixture is selected so that the particle size is large enough to be treated safely and is small enough to be transported by means of a gas flow. As a carrier gas for carrying the mixture, a non-combustionable gas or fuel gas is used. A fuel gas and a combustion-assisting gas are discharged toward the section to be treated on the surface for directing a combustioning frame. The refractor material with the carrier gas is discharged into the frame established by the fuel gas and the combustion-assisting gas. The average size of the metal particle to be used in the spray coating is limited to be greater than 50 .mu.m. By enlarging the particle size of the metal, combustion of the metal particle becomes difficult. Combustion of such large particle size metal can be assisted by discharging the combustion-assisting gas together with the fuel gas. This compensates combustion efficiency to be dropped by utilizing the larger particle size metal.

Method and apparatus for spray coating of refractory material to

A method of oscillating a mold of a vertical continuous caster of the type having a pair of longer side frames and a pair of shorter side frames. The mold is oscillated vertically during the casting. A pair of mold walls, e.g., the longer side frames, are moved towards and away from the cast metal in synchronization with a vertical oscillation of the mold, so as to control the condition for supplying a mold powder into the gap between the mold walls and the cast metal.

Method of oscillation of mold of vertical continuous caster

In order to securely hold a moving belt of a continuous casting device against selective movable side walls, a first group of rotatable control rods which are disposed in a first supply header and an adjacent exhaust header are arranged to produce narrow high pressure zones in the film defined between the cooling pad in which the header are formed and the moving belt. These zones can be selectively moved to juxtapose the side walls when the gap between the walls is adjusted. A second group of rotatable control rods which are disposed in second and third supply headers selectively heat the side edges of the belt which are relatively cool as compared with the center section which is exposed to molten metal. As the side walls are moved apart the width of the edge sections which are exposed to pre-heated coolant can be reduced and the amount of normal temperature coolant applied thereto also increased.

Cooling pad arrangement for belt caster type continuous casting device

A method and apparatus for continuous casting of an elongated thin metal strip achieves substantially high yield without allowing break-out or sticking. The method for casting a continuous elongated metal strip includes a step of driving endless belts at a varying speed so as to apply jerks to the slightly and half-solidified metal that release the metal from the surfaces of the stationary side walls. Applying jerks to the casting chamber by varying the driving speed of the endless belt ensures that the solidifying metal will travel smoothly and thus ensures a high manufacturing yield.

Apparatus for casting endless strip

A belt type cast sheet continuous caster of the type comprises a pair of opposed circulatorily movable belts, a pair of opposed side plates arranged along opposite side edge portions of the movable belts, coolers which each have numerous water feed openings and water discharge openings opened to the movable belt and are arranged behind the respective movable belts, and movable partition plates which are placed in respective cooling headers and each connected to driving means for moving the partition plates in a width direction of a cast sheet. A casting space is defined by the movable belt and the side plates. Melt leakage at sliding portions between mold short side plates and the metal belts in a belt type cast sheet continuous caster comprising the metal belts and the mold short side plates arranged along side edge portions of the metal belts and cooleres, which each have numerous water fed openings and water discharge openings opened to the metal belt and are arranged behind the respective metal belts, is prevented by controlling gaps between the metal belts and the mold short side plates through varying a pushing force of the metal belts to the mold short side plates.

Belt type cast sheet continuous caster and prevention of melt leakage in

Method and apparatus for casting endless strip

Growing community of inventors

Chiba, Japan

Tetsuya Fujii