以云南兰坪低品位氧化锌矿及其循环浸出渣的浮选精矿为原料，常温常压下在MACA(金属氨络合物)体系中进行循环浸出。浸出液先净化除砷和锑、再两段锌粉逆流置换深度净化，两次净化后液电积制取电解锌。考察工艺中循环浸出率、净化率、物质平衡以及电解锌质量和电耗等技术经济指标。结果表明：先用 MACA 法处理原矿粉，再浮选硫化锌的选-冶结合流程是合适的兰坪低品位氧化锌矿的处理方案，原矿锌的平均浸出率为70.48%，其氨可溶锌浸出率达到89.14%，浮选精矿锌的浸出率为79.75%，杂质元素的净化率达到95%，电解锌纯度达到99.98%，电流效率可达97.02%。
The low grade zinc oxide ores from Lanping in Yunnan Province were treated through cycle leaching in MACA(Metal-ammonium-chloride-ammonia) system at room temperature and pressure. The residue was recovered by flotation and leached in the MACA solution subsequently. The leaching solution was electrodeposited after removal of As and Sb and then deeply purified through two-stage countercurrent of zinc replacement. The technical and economic target, such as cycle leaching rate, removal rate, materials balance, electric zinc quality and power consumption, were investigated. The results show that the combined method of flotation-metallurgy is a suitable process for treating low-grade zinc oxide from Lanping. The average zinc leaching rates for raw ores, ammonia soluble zinc and flotation concentrate are 70.48%, 89.14%and 79.75%, respectively. The purification rate and current efficiency are up to 95%and 97.02%, respectively. Electrolytic zinc with purity of 99.98%Zn is manufactured.
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