Development of zinc, tin, and lead recovery process from secondary technogenic raw materials

The raw-material base of non-ferrous metal production can be extended now as a result of recycled material and technogenic product processing. For the zinc industry, a special interest can concern polymetallic dusts of the copper production containing a complex of valuable components including zinc, lead, tin, and copper. An actual problem is selective extraction of the metals in the course of industrial processing of dusts. The work describes the copper processing practice now in force at OAO "Chelyabinsk Zinc Works"; the basic technical problems concerned with inhomogeneity of properties of various zinc-containing raw materials are presented. The phase and element compositions of the subject of inquiry – dusts of allowing powder materials – are given. Based on the results of the thermodynamic simulation of the pyrometallurgical copper dust processing practice, the principal reactions promoting the distillation of volatile zinc, lead, and tin compounds at the conditions of high temperatures have been analyzed. The results of kinetic parameter determination for sublimation reactions of the said metals are given. From the results of some laboratory researches, the basic optimum conditions are developed for the maximum transit of zinc, lead, and tin compounds into gas phase at the Waelz process of dusts of the copper production.

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