PROCEDURE FOR PROCESSING RESIDUES OF CARBONYL NICKEL SYNTHESIS Russian patent published in 2010 - IPC C22B7/00 C22B15/00 C22B23/00 

FIELD: metallurgy.

SUBSTANCE: invention refers to procedure for processing residues of synthesis of carbonyl nickel containing non-ferrous and platinum metals. The procedure consists in charging decarbonylised residues, and in leaching in heated source hydrochloric acid solution containing not less, than 2 mole/l of nickel and cobalt chlorides and 0.25-0.5 mole/l of hydrochloric acid; also decarbonylised residues are charged discretely. Leaching is carried out with supply of gaseous chlorine and with maintaining redox potential in the interval of values 350-400 mV. Copper, iron and partially nickel and cobalt are transferred into a leaching solution. The rest part of nickel, cobalt and also platinum metals are concentrated in leaching residue. Leaching residue is processed producing concentrate of platinum metals. Produced solution of leaching is filtered, cooled and subjected to liquid extraction when a basic part of copper is recovered into extract. The basic part of copper is directed to re-extraction at presence of oxidant producing solution of copper chloride (II); further, nickel, cobalt and residual part of copper are extracted into raffinate. Also part of raffinate is directed to the leaching stage.

EFFECT: raised efficiency of processing residues of carbonyl nickel synthesis.

7 cl, 8 ex