METHOD OF PRODUCING COPPER METAL POWDER, COPPER OXIDES AND COPPER FOIL Russian patent published in 1999 - IPC

FIELD: production of copper metal powder, copper oxides and copper foil. SUBSTANCE: method of production of copper metal powder from copper-containing material includes: bringing in contact of copper-containing material with leaching solution for dissolving of copper ions and formation of leaching solution enriched in copper; bringing in contact of leaching solution enriched in copper with extracting agent to form extracting agent enriched in copper and leaching solution depleted of copper; separation of extracting agent from depleted leaching solution; bringing in contact of extracting agent enriched in copper with desorbing solution to form desorbing solution enriched in copper and extracting agent depleted of copper; separation of reagents to form the first electrolyte; application of voltage between anodes and cathodes to precipitate copper metal powder on cathode. Electrolyte may have concentration of chloride ions up to 5 ppm. Electrolyte may contain at least one triazol. Copper metal powder may be transformed into copper foil or into copper oxides. The latter may be used for production of copper foil. EFFECT: higher efficiency. 23 cl, 2 dwg, 4 tbl