Abstract
The leaching behavior of metals from copper anode slime was investigated using an alkali fusion-leaching process for the preliminary separation of metal values. The slime was fused with sodium hydroxide (NaOH) and sodium nitrate (NaNO3) followed by water leaching. Various parameters of the process were studied, including NaOH/slime mass ratio, NaNO3/slime mass ratio, fusion temperature and time, slime/water ratio, leaching temperature and time. More than 97% Se, 98% As, 86% Sn and 76% Pb are leached under optimum conditions while only 1.5% Cu and 3.5% Sb are dissolved. Copper, lead, antimony and silver in residue exist as CuO, PbO, NaSb(OH)6 and Ag, respectively. Almost all the tellurium, silver, gold and platinum are left in the residue. Based on the experimental results, a flow sheet for comprehensive recovery of metal values from copper anode slime was proposed.
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