METHOD OF PROCESSING ZINC-CONTAINING METALLURGICAL SLURRIES Russian patent published in 2019 - IPC C22B7/00 C22B5/10 

FIELD: technological processes.

SUBSTANCE: invention relates to processing of zinc-containing wastes, namely sludge and dust of wet and dry gas cleaning of blast-furnace, open-hearth, converter, electric-steel melting and other industries, and can be used in ferrous and non-ferrous metallurgy. Zinc containing wastes from metallurgical production are dried and dried slurry is mixed with carbon reducing agent. Obtained mixture is subjected to high-temperature treatment at temperature up to 1,100° with reduction of iron oxides to metallic iron and evaporation of zinc. Slurry is dried in mixer-batcher by adsorption dehydration with fine-grained brown coal semi-coke, taken in ratio 1:(1.5–2). Moistened brown-coal coke is separated by pneumo-separation and directed into intermediate hopper, and dried slime mixed with carbonaceous reducing agent in ratio 1:(0.5–1), subjected to thermochemical agglomeration in furnace with rotating hearth. Ferrocox produced after firing is cooled and sorted into classes.

EFFECT: method enables to recycle wastes from metallurgical production and produce a product – ferrocox with removed zinc and metallized iron suitable for use in blast-furnace production.

1 cl, 1 dwg