LLC “UMMC-Holding”, Verkhnyaya Pyshma, Russia:

A. M. Panshin, Technical Diretor

JSC “Chelyabinsk Zinc Plant”, Chelyabinsk, Russia:

Yu. V. Reshetnikov, Deputy Technical Director — Head of Production Department
D. A. Ivakin, Head of Technological Bureau of Engineering Center, e-mail: dai@zinc.ru
V. V. Geraskin, Leading Production Engineer of Engineering Center

Chelyabinsk Zinc Plant developed the technology of processing of zinc-, lead- and tin-containing copper industry dusts, including the following stages:
– pyrometallurgical stage — calcination with addition of sulphidizer, flux and reducing agent to the product, where lead is removed from the product with transfer in processed sublimates, while zinc and tin stay in cinder;
– hydrometallurgical stage — high-temperature leaching of cinder, where zinc, iron, coper, etc are extracted in solution with obtaining of tin-concentrating solid residue.
There is considered the hydrometallurgical stage of obtaining of tin-containing concentrate from cinder with low content of lead (less than 1%). There is shown the low extraction of zinc in solution and absence of selective separation of tin and lead with acid sulfuric-acid dust leaching without application of pyrometallurgical stage. Three-stage leaching (similar to the technology of hydrometallurgical processing of Waelz-oxides, existing in Chelyabinsk Zinc Plant) and one-stage high-temperature leaching were researched for obtained cinder. Three-stage product leaching is low-efficient, because it requires many equipment and does not provide the required concentration of tin in solid residue. About 98% of zinc, contained in cinder, more than 95% or copper and iron is transferred in solution during the high-temperature product leaching by waste zinc electrolyte with addition of sulfuric acid (t = 80–90 ^oC, concentration of H₂SO₄ is 160–170 g/dm³). Obtained solution is required for application in technological cycle of zinc plant. Solid residue contains 14–21% of tin, which allows to use it at tin enterprises.

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