METHOD OF PROCESSING CONCENTRATE OF REFINERIES DUST Russian patent published in 2009 - IPC C22B11/00 C22B7/02 

FIELD: metallurgy.

SUBSTANCE: method consists in leaching of source product in solution of caustic soda, in separation of non soluble residue from alkali solution, and in melting of non soluble residue with additives. After melting melt is settled and cooled to solidification, then hardened metal is divided along borders of phase division to slag and bottom heavy melt. Further, bottom heavy melt is crumbled into powder and processed as concentrate of refinery production, then leached in solution of hydrochloric acid wherein gaseous chlorine is supplied. Additives not containing selenium, tellurium or their compounds are used at melting of non soluble residue. Upon crumbling bottom heavy melt produced at melting is treated with solution of nitric acid; nitric acid solution containing lead and silver is separated from non soluble residue processed as concentrate of refineries.

EFFECT: additional extraction of lead from source product.

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