PROCESSING METHOD OF COPPER MANUFACTURING DUST Russian patent published in 2009 - IPC C22B15/00 C22B7/02 C22B3/04 

FIELD: metallurgy.

SUBSTANCE: invention concerns processing method of copper manufacturing dust. Method includes dust leaching at elevated temperature with transferring of copper and iron into solution, separation of solution from insoluble residue, separation of copper and iron. Than it is implemented evaporation of solution, containing basic quantity of copper, blue copperas crystallisation, separation of blue copperas crystals from growth solution and extraction from growth solution of residual quantity of copper. At that solution evaporation is implemented till providing of its density 1.30-1.36 g/cm³. Separation of copper and iron is implemented during the process of blue copperas crystallisation. Received blue copperas crystals are dissolved in sulfuric solution till providing of sulfuric acid concentration 100-250 g/l. Formed solution of blue copperas is exposed to basic electro- extraction with receiving of cathode copper and gate-type electrolyte. Extraction of copper residual quantity from growth solution is implemented by additional electro- extraction. Copper extraction degree from dust into solution at leaching is defined by content of copper in dust in oxidised form and reach 99.4%. Total copper extraction into cathodic metal is 89.4-95.2%.

EFFECT: receiving of qualitative cathode copper of grades MOOK, MOK, M1K, and also copper sponge at outlet by current on basic electro- extraction till 93,3% and at additional - till 74,6%.

10 cl, 4 ex