METHOD OF COPPER EXTRACTION FORM SULPHATE CONTAINING DUST OF COPPER PRODUCTION Russian patent published in 2009 - IPC C22B15/00 C22B7/02 C22B3/04 

FIELD: metallurgy.

SUBSTANCE: invention concerns methods of residue utilisation. Particularly it concerns method of copper extraction from sulphate containing dust of copper production. Method includes water leaching of dust with copper and impurity elements conversion into leaching solution, separation of solution from insoluble residue, liquid solvent extraction of copper by oximne extractant with receiving of copper-bearing extract and raffinate, containing impurity elements. After extraction it is implemented copper re-extraction, cleaning of received re-extract from extragent and electro-extraction of copper with receiving of commercial copper and reversible electrolyte. At that water leaching of dust is implemented at temperature 60-100°C and H:L=1:2-4. Leaching solution is cooled with crystallisation of copper main part in the form of vitriol and forming of mother solution, containing residual part of copper. Vitriol is separated from mother solution, dissolved in sulphuric solution and fed to electro-extraction, and liquid solvent extraction is implemented from mother solution.

EFFECT: receiving of qualitative cathode copper of grade MOOK with yield into commercial product up to 98% of copper at high (90,5-93,5%) yield by stream, and also in reduction of material flow volume and deep separation of copper from impurity elements.

9 cl, 3 ex