铜锌混合氧化矿回收锌生产实践

Production practice of zinc recovery from copper-zinc mixed oxide ore

铜锌混合氧化矿属于复杂含锌矿物,采用浮选法对氧化矿中的铜矿物和锌矿物进行分离的效果比较差。某冶炼企业将铜锌混合氧化矿采用浸出-萃取-电积提取金属铜和金属锌,该工艺中除锌萃取技术外,其他技术均属于常规工艺。锌萃取工艺采取P204为萃取剂,260~#溶剂油为稀释剂,富锌液经除油工序后再经压滤,然后送锌电积工序。针对生产实践中的问题通过采取提高锌萃取原液的锌浓度、优化萃取工艺、加强设备防腐等措施均已得到解决,锌锭实际产能超过了设计产能,达到1.3~1.4万t/a。该项目的成功运行实现了从铜锌混合氧化矿物中综合提取金属铜和锌,为后续新建项目的设计及生产提供了经验。

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, 260solvent 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 13 000~14 000 t/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.