China Nonferrous Metallurgy

The high-acid and high-chlorine wastewater is a major discharged wastewater from the joint mineral processing and metallurgical treatment of copper anode slime and the high acidity, high chlorine content, more impurities and other features result in the low resource recycling and high treatment cost. Through the analysis on the principle and the production practice of wet selenium removal from anode slime, the feasibility of returning the high-acid and high-chlorine wastewater to the wet selenium removal process for resource utilization is explored. The results show that when the concentration of the selenium removal slurry is 1.70-1.80 kg/L the high-chlorine and high-acid wastewater amount is 763 L per tank, the industrial salt consumption is 50 kg per tank and the sulfuric acid consumption is 100 L per kettle, the technical indicators can be achieved that the selenium removed residue contains 2.82% of selenium, the tailing ores contain 50 g/t of gold, the tailing ores contain 0.25% of silver, the concentrate grade is 54.04%, the high acid wastewater contains 7.34 g/L of copper, and the wastewater from mineral processing contains 0.57 g/L of copper. The production indicators are relatively stable and both the discharge of the liquid after selenium reduction and the sulfuric acid consumption are lowered.