Effect of additives on the mineralization of heavy metals in Cu-Ni electroplating sludge

The heavy metal sludge with 2.61 % Cu and 2.28 % Ni was treated by mineralization-separation technology. It was studied systematically that the effects of sulfurizing agent, rhyolite and flux on the mineralization of heavy metals in Cu-Ni electroplating sludge. The results showed that the suitable sulfurizing agent, rhyolite and flux were SJ, quartz and borax respectively, and their suitable dosage were 20 %, 20 % and 2 %. Based on the above additives conditions and in the case of the bituminous coal dosage 15 %, the sintering temperature 1 150 ℃ and the sintering time 60min, the yields of concentrate and tailing were 32.86 % and 59.48 % respectively, and the grades of Cu and Ni in concentrates were 6.96 % and 6.15 %, and their recoveries were 87.63 % and 88.64 %, and the Cu and Ni grade in tailing reduced to 0.54 % and 0.44 %.