METHOD OF PROCESSING OF DUST FROM REFINING PRODUCTION Russian patent published in 2009 - IPC C22B11/00 C22B3/04 

FIELD: metallurgy.

SUBSTANCE: invention can be used for reprocessing of wastes from refining production, particularly for reprocessing of dust-fumes or non-water-soluble residues of dust-fumes which are concentrates of dust from refining production. Method of reprocessing of dust concentrate from refining production includes leaching in solution of caustic soda, separation of not-solved residue from alkaline solution, melting of not-solved residue with admixtures and grinding. After melting and grinding it is implemented reprocessing of received at melting of bottom heavy alloy as concentrate of refining production. Before leaching in solution of caustic soda initial product is depulping in water. Received pulp is acidified by addition of acid up to achievement of pH=1-2 and subject to grouting treatment by addition of iron powder.

EFFECT: reduction of amount of noble metals, transferring into alkaline solution at leaching stage of DFRP in caustic soda, increasing of direct extraction of noble metals.

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