JPH05247552

PURPOSE:To deposit and recover Cu at a high yield by washing lead electrolysis anode slime, then subjecting this slime to a repulp treatment with sulfuric acid, blowing air to a leaching liquid in succession thereto to leach the Cu into a sulfuric acid soln. and electrolytically treating the Cu-contg. leaching liquid. CONSTITUTION:The anode slime generated at the time of producing Pb by electrolytic refining contains Au, Ag, Cu, Sb, Bi, etc., in the form of metals and, therefore the fluosilicic acid-components of the Pb electrolyte sticking to the surface is first washed by water or dilute sulfuric acid. The washing liquid contg. the Pb and fluosilicic acid is returned to a Pb electrolyzing stage. The washed anode slime is repulped by the sulfuric acid and air is blown into this repulp liquid to leach the Cu contained therein and to separate the Cu from the other valuable metals, such as Au and Ag; thereafter, the copper-contg. leaching liquid by the sulfuric acid is separated from the anode slime and is subjected to electrolytic refining, by which the pure copper is deposited on cathode and is recovered. The anode slime from which the Cu is leached away and contains the valuable metals, such as Au and Ag, is sent to another stage where the Au, Ag, etc., are recovered.