Sustainable Mining and Metallurgy

According to the results of multi-element analysis and phase analysis of the acid sludge produced by the acid system of copper smelting flue gas, the copper, selenium, mercury and gold, silver, lead and other metals of the acid sludge were separated by atmospheric pressure oxidation leaching process, so that copper, selenium and mercury entered the leaching solution, while gold, silver and lead remained in the slag to form precious lead slag, so as to realize the separation and recovery of valuable elements in the acid sludge. The factors affecting the leaching effect of copper, selenium and mercury were investigated, and the optimum process conditions for the oxidative leaching of acid mud were determined: liquid-solid ratio 2∶1, reaction temperature 75℃, reaction time 3h, and sodium chlorate dosage 2.0 times of the theoretical amount. Under these conditions, the leaching rates of copper, selenium and mercury reached more than 95%, 96% and 99%, respectively, which achieved the purpose of separating valuable elements from acid mud.