REPROCESSING METHOD OF COPPER CONCENTRATE FROM FOAM SEPARATION OF NIS MATTE Russian patent published in 2008 - IPC C22B15/00 C22B3/08 

FIELD: metallurgy.

SUBSTANCE: method includes oxidising roasting, copper cinder leaching in circulating electrolyte, compartment of leaching residual, electroextraction of copper from leaching solution. At that leaching residual in the form of thickened underflow is effected to foam separation with concentrate extraction of precious metals, and chambered product, containing in preference nonferrous materials. Chambered product is reprocessed for secondary nis matte. Electrolyte part after copper electroextraction is separated and effected to evaporation till concentration of sulfuric acid 250-300 g/l, copper vitriol is extracted from it by crystallisation, and sulfuric acid by extraction and it is returned to leaching of copper cinder. Raffinate after acid extraction, containing nickel in preference, is directed to nickel manufacturing. Concentrate of precious metals is directed to refining.

EFFECT: reduction of expenditure of energy and material cost and increasing of receiving materials extraction.

1 dwg, 1 tbl, 1 ex