China Nonferrous Metallurgy

Copper-zinc mixed oxide ore is complex zinc-bearing ore, and the separation effect of copper minerals and zinc minerals in oxide ore by flotation is poor. In a smelting enterprise, copper and zinc were extracted from copper-zinc mixed oxides by leaching-extraction-electrowinning. Except for zinc extraction technology, the other technologies belong to conventional processes. In the zinc extraction process, P204 is used as extractant, 260^# solvent oil is used as diluent. The zinc-rich solution is subject to oil removal, pressure filtration, and then zinc electrowinning process. Through measures such as increasing zinc concentration in zinc extraction stock solution, optimizing extraction process and strengthening equipment corrosion-resistance, the problems in production practice have been solved. The actual output of zinc ingot exceeded the designed capacity, reaching 13000~14000t/a. The successful operation of the project has realized the comprehensive extraction of copper and zinc from copper-zinc mixed oxide ore, which offered the experience for the design and production of subsequent new projects.