Abstract: The separation of lead and zinc from tailings with high mud content in Yunnan was examined, which was characterized by a fine particle size, severe argillization, and relatively complex properties. A combination of flotation and gravity separation of mud and sand was adopted to effectively separate lead and zinc and realized the comprehensive recovery and utilization of the complex tailing resources. Results revealed that the lead content was 4.29wt% and that the zinc content was 4.99wt%. Lead mainly existed as cerussite and plumbojarosite. Lead and iron metasomatize to form different wrapping forms, making separation extremely difficult. Zinc mainly existed as zinc oxide, which exhibited a high degree of oxidation. Zinc oxidation rate reached up to 99%, and it was mainly difficult to separate hemimorphite. Ultimately, the lead concentrate with a lead grade of 33.87% and a recovery rate of 62.53% were obtained by the closed-circuit beneficiation process; the silver content in the lead concentrate and its recovery rate were 142.50 g/t and 30.92%, respectively; the zinc concentrate with a zinc grade of 15.21% and a recovery rate of 47.82% were obtained.

Key words: tailings, separation of lead and zinc, Combination of flotation and gravity, high oxidation rate

摘要： 针对云南高泥尾矿铅锌嵌布粒度细、泥化严重、性质相对复杂的技术难点，进行了铅锌分离实验研究，采用泥砂分级别浮选-重选联合工艺流程，有效分离了铅锌，实现了该复杂尾矿资源的综合回收利用。结果表明，该矿中铅含量为4.29wt%，锌含量为4.99wt%，铅主要以白铅矿和铅铁矾的形式存在，铅和铁相互交代形成不同的包裹形式，分离难度极大；锌主要以氧化锌的形式存在，氧化程度较深，锌氧化率达99%，且主要为难选的异极矿。最终通过闭路选矿流程，获得铅品位33.87%，回收率62.53%的铅精矿；铅精矿中银品位142.50 g/t，银回收率30.92%；获得锌品位15.21%、回收率47.82%的锌精矿。

关键词: 尾矿, 铅锌分离, 浮重联合, 高氧化率