Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Shoji Imura

Hiroshi Ichikawa

Hiroshi Oda

Tetsuharu Ibaraki

Yoichi Abe

Shigeki Takahashi

Masaharu Takahashi

Satoshi Suzuki

Tetuharu Ibaraki

Takashi Hiromatsu

Satoshi Kondo

Nobuyuki Kanemori

Hiroshi c/o Nippon Steel Corporation Engineering Divisions Group Ichikawa

Satoshi Nippon Steel Corporation Suzuki

Shigeki Nippon Steel Corporation Takahashi

Nobuyuki Nippon Steel Corporation Kanemori

Yoichi Nippon Steel Corporation Abe

A method of reduction treatment of metal oxides characterized by using as a material a powder containing metal oxides and containing alkali metals and halogen elements and further, in accordance with need, carbon, mixing the material with water to produce a slurry, then dehydrating this and charging the dehydrated material, mixed with another material in accordance with need, into a rotary hearth type reduction furnace for reduction.

Method of reduction treatment of metal oxides or steelmaking waste and method of concentrating and recovering zinc and/or lead

The present invention provides a method and facility for preventing crumbling and powderization of green pellets when producing high strength green pellets using a powder feedstock and using the pellets in a rotary hearth reducing furnace and for efficiently reducing the same. It comprises kneading by a kneadera feedstock of a powder of a fine particle size (20 to 80 wt % having size of not more than 10 &#x3bc;m) including a metal oxide and carbon-bearing powder fed from a feed storage tankand producing green pellets by a pan type pelletizer. The green pellets are screened by a pellet screen, then dried by a pellet dryerand reduced by firing in a rotary hearth reducing furnace. At that time, the green pellets are continuously conveyed to prevent crumbling.

Metal oxide-bearing green pellets for reducing furnace, method of production of same, method of reduction of same, and reduction facility

A method of reduction treatment of metal oxides characterized by using as a material a powder containing metal oxides and containing alkali metals and halogen elements and further, in accordance with need, carbon, mixing said material with water to produce a slurry, then dehydrating this and charging the dehydrated material, mixed with another material in accordance with need, into a rotary hearth type reduction furnace for reduction.

Method for reduction treatment of metal oxide or ironmaking waste and method for concentration and recovery zinc and/or lead

The present invention provides a method and facility for preventing crumbling and powderization of green pellets when producing high strength green pellets using a powder feedstock and using the pellets in a rotary hearth reducing furnace and for efficiently reducing the same. It comprises kneading by a kneadera feedstock of a powder of a fine particle size (20 to 80 wt % having size of not more than 10 &#x3bc;m) including a metal oxide and carbon-bearing powder fed from a feed storage tankand producing green pellets by a pan type pelletized. The green pellets are screened by a pellet screen, then dried by a pellet dryerand reduced by firing in a rotary hearth reducing furnace. At that time, the green pellets are continuously conveyed to prevent crumbling.

Metal oxide-containing green pellet for reducing furnace, method for production thereof, method of reduction thereof, and reduction facilities

The present invention provides a reducing furnace of the rotary hearth-type and a method for reducing a metal oxide simplified in the process from dehydration to molding, according to which a moisture-rich powdery raw material is reduced at low cost. The present invention also provides an operation method whereby dusts or sludge generated in the refining or processing of metal are economically recycled. A powdery mixture having a moisture content of 100% or higher relative to the total mass of a metal oxide-containing powder and a carbon-containing powder is made into a slurry and mixed by stirring. Thereafter, the slurry is dehydrated to a moisture content of 16 to 26% and compression-molded into articles. The cylindrical or granular shaped articles having a thickness or diameter of 30 mm or less thus obtained are fed to a zone the atmospheric temperature of which is 1170&#xb0; C. or lower in the furnace and reduced through calcination by a rotary hearth reducing furnace thereby to provide a metal.

Facility for reducing metal oxide, method of operating the same, and shaped article of raw material for reducing furnace

Facility for reducing metal oxide, method for operating the facilities and moldings as raw material to be charged to reduction furnace

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Kimitsu, Japan

Shoji Imura