METHOD OF REPROCESSING OF ZINC-CONTAINING WASTE PRODUCTS OF METALLURGICAL PRODUCTION Russian patent published in 2006 - IPC C22B1/216 C22B7/00 C22B19/30 

FIELD: ferrous and nonferrous industry; methods of reprocessing of zinc-containing waste products.

SUBSTANCE: the invention is pertaining to the field of ferrous and nonferrous industry, in particular, to the method of reprocessing of zinc-containing waste products of metallurgical production and may be used in ferrous and nonferrous metallurgy. The method provides for mixing of the wastes with a carbon reducing agent, a high-temperature treatment of the gained mixture in the roasting furnace, withdrawal of zinc and trapping sublimates with production of zinc oxides. The gained mixture is granulated with production of granules of 4-10 mms sizes and humidity of 11-15%. The high-temperature treatment of the mixture is conducted at temperatures of 910-1100°C for 1-2 hours. The trapping sublimates of zinc conduct by withdrawal of 70-80 % from the total volume of the zinc-containing dust-gaseous mixture from the reaction zone of the roasting furnace. The rest volume of the dust-gaseous mixture is withdrawn from the cold end of the roasting furnace. From the withdrawn from the cold end of the roasting furnace dust-gaseous mixture separate the zinc-iron-containing dust and return it to be used in a sub-charge for the initial granulated mixture and the zinc-free granules are directed into agglo blast-furnace production. The invention allows to reach the heightened degree of extraction of the commercial zinc product with a minimal share of impurities and also to reduce the harmful effect of the wastes on environment.

EFFECT: the invention allows to obtain the heightened degree of extraction of the commercial zinc product with a minimal share of impurities, to reduce the harmful effect of the wastes on environment.

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