广东某含铜污泥冶炼渣富集工艺研究

Beneficiation Technology Study on a Smelting Slag from Copper Bearing Sludge in Guangdong

某含铜污泥冶炼渣(以下简称铜渣)含铜3.50%,铜主要以金属铜和铜镍锡合金的形式存在,含铜物质嵌布粒度粗细不均匀,其中-0.01mm难选粒级占55%左右。对该铜渣开展浮选工艺研究,考察了磨矿细度、粗选pH和丁基黄药用量等条件对浮选指标的影响,并进行了全粒级浮选和筛分—浮选流程的开路对比试验。结果表明,在磨矿细度为-0.075 mm占85.76%的条件下,以丁基黄药为捕收剂,松醇油为起泡剂,全粒级开路浮选最终可获得铜品位为20.56%、铜回收率为65.98%的铜精矿;而筛分—浮选最终可获得铜品位15.65%、铜回收率56.52%的浮选铜精矿和铜品位22.56%、铜回收率18.63%的+0.15 mm产品,铜的综合回收率达75.15%,尾矿铜品位降低至0.49%。全粒级闭路浮选中矿易累积,而筛分—浮选闭路试验流程稳定,最终+0.15 mm产品和浮选精矿的综合铜回收率为85.15%、铜品位为11.90%,满足回炉冶炼要求。

A smelting slag from containing copper sludge(referred to as copper slag in the following)contains 3.50%copper,which mainly exists in the form of the metal copper and Cu-Ni-Sn alloy.The dissemination particle size of copper material is not uniform,of which the refractory particle size of-0.01 mm accounts for about 55%.The flotation process of copper slag was studied,and the effects of grinding fineness,roughing pH and butyl xanthate dosage on flotation indexes were investigated.The open-circuit comparison tests between whole-grain flotation and sieving and flotation processes were also carried out.The results showed that under the condition of grinding fineness of 85.76%accounting for-0.075 mm with butyl xanthate as collector and terpenol oil as foaming agent,the copper concentrate with copper grade of 20.56%and copper recovery of 65.98%can be obtained by full-grain open-circuit flotation.The copper concentrate with copper grade of 15.65%and copper recovery of 56.52%and+0.15 mm product with copper grade of 22.56%and copper recovery of 18.63%were finally obtained by sieving and flotation.The comprehensive recovery of copper reached 75.15%,and the copper grade of tailings was reduced to 0.49%.The middles of the whole-grain closed circuit flotation are easy to accumulate,and the sieving and flotation closed circuit test process is stable.The final+0.15 mm product and flotation concentrate have a comprehensive copper recovery of 85.15%and a copper grade of 11.90%,which meet the smelting requirements of the furnace.