云南某铜铅锌混合矿降硅试验研究

云南某铜铅锌混合矿矿石各矿物嵌布粒度不均匀,共生关系密切,铅锌含量较高,经磨矿后即可作为铜铅锌混合精矿直接销售给白银集团公司第三冶炼厂,由于铜铅锌混合精矿中二氧化硅高达7.51%,给冶炼工艺造成了一定的困难,为降低铜铅锌混合精矿中二氧化硅的含量,采用铜铅锌混合浮选-脱水再混合浮选的工艺对该矿石进行了选矿试验研究。结果表明,在磨矿细度为-0.074 mm占85%的情况下,采用铜铅锌混合粗选Ⅰ直接选出混合精矿1,再将混合粗选Ⅰ的尾矿进行脱水,提高矿浆浓度后,采用铜铅锌混合粗选Ⅱ经两粗一精获得混合精矿2,两次粗选尾矿为最终尾矿。采用水玻璃、硫酸铜、丁基黄药、2#油四种药剂。最终铜铅锌混合精矿铜铅锌品位分别达到2.95%、20.68%、24.17%;铜铅锌回收率分别达到95.26%、93.12%、96.15%;混合精矿伴生银品位为147.22 g/t,银回收率为92.79%;铜铅锌混合精矿二氧化硅含量降低为4.25%,达到了冶炼工艺的合理要求。

Silicon Removal Study on a Copper-Lead-Zinc Composite Ore from Yunnan

A copper-lead-zinc composite ore from Yunnan is quite uneven in terms of particle size distribution and close in-tergrowth, and is rich in lead and zinc.After grinding, as a copper-lead-zinc concentrate, it can be sold directly to the Third Smelting Plant of Baiyin Nonferrous Metallic Group.But this concentrate contains 7.51%silicon dioxide, resulting in difficulties for the smelting process.To reduce the silicon content of this product, bulk flotation of copper-lead-zinc, water removal and second bulk flotation is adopted.Under the condition of grinding fineness of 85%-0.074 mm, a composite con-centrateⅠis obtained after the first bulk flotation.A certain amount of water is removed from the corresponding tailings to increase its pulp density.After two roughings and one concentration treatment of this dense pulp, a composite concentrateⅡis obtained.The resulting tailings is the final.Sodium silicate, copper sulfate, butyl xanthate and pine oil were used in the process.The final composite concentrate contains 2.95%copper, 20.68%lead and 24.17%zinc and the corresponding recovery was 95.26%, 93.12%and 96.15%respectively.The concentrate also contains silver 147.22g/t and its recovery is 92.79%.The content of silicon dioxide in the concentrate is reduced to 4.25%, which meets the requirements of smelting operation.This beneficiation process is relatively simple, easy to operate.