Mitsubishi Materials Corporation

Fumito Tanaka

Osamu Iida

Nobuhiro Oguma

Masaharu Yamada

Susumu Okabe

Hideya Sato

A method of treating recyclable raw materials containing valuable metals is provided, the method including the steps of feeding recyclable raw materials (W) containing valuable metals into a rotary kiln furnace () in which a refractory product having an AlO&#x2014;CrOcontent of 70% or greater is used for an inner wall; feeding an additive (A) containing SiOas a major component into the rotary kiln furnace () so as to increase a viscosity of a slag (S) flowing along the inner wall, thereby the recyclable raw materials (W) are attached on the slag (S) having a high viscosity such that at least part of the recyclable raw materials (W) is exposed to the inside of the rotary kiln furnace; and burning/melting the recyclable raw materials (W) attached on the slag (S) in the rotary kiln furnace ().

Method of treating recyclable raw materials

Method for charging anode into furnace and method for designing furnace

The present invention provides a magnesia-spinel refractory in which corrosion resistance and slag penetration resistance are significantly improved. The magnesia-spinel refractory is obtained by mixing magnesia granulated powder having a particle diameter of 10 to 150 &mgr;m and alumina powder having a particle diameter of 0.1 to 5 &mgr;m, molding the resultant mixture, and then burning the molded product to form a dense and strong combined structure of periclase and spinel. The mixture of magnesia and alumina contains powders of both components, or a powder of one of the components and a granulated powder of the other component. It is preferable to use a spray dryer method as granulating means, and a hydrostatic pressing method as molding means. These mixtures are used for producing magnesia-spinel protecting tube and crucible, bricks for copper smelting and converting furnaces, and magnesia-spinel protecting tube and crucible for copper smelting and converting furnace slag. In this case, the hydrostatic pressing method is used.

Magnesia-spinel refractory and method of producing the same

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Tokyo, Japan

Fumito Tanaka