Abstract:By investigating the low-acid copper leaching of the steamed selenium residue, it is concluded that the steamed selenium residue contains acid. Under the same pH value, as the solid-to-liquid ratio increases, the copper concentration in the leaching solution gradually increases, and the copper content of the leaching residue gradually increases; with the extension of the leaching time,the copper concentration in the leaching solution gradually increased and then decreased, and the copper content in the leaching residue gradually decreased and then increased. The choice of temperature is affected by the amount of added acid. Under the condition of the same amount of added acid, when the leaching temperature is 85℃, the leaching residue contains the lowest copper. As the amount of acid increases, the copper content in the leaching solution gradually increases, and the copper content in the leaching residue gradually decreases. The preferred acid leaching conditions are solid-liquid ratio 50∶1, leaching time 6h, temperature 85℃, and acid supplement 41.6g/kg. The obtained leaching solution contains 8.64 g/L copper, 13.94 g/L acid, and 1.21% copper in the leaching residue.