分步浮选提高甘肃某铜矿石选矿指标

Improving Beneficiation Indexes for a Copper Ore from Gansu by Stage Flotation Process

甘肃某铜矿石含铜1.6%左右,铜主要以黄铜矿的形式存在,但黄铜矿单体解离性能欠佳且可浮性不一致,对分选不利。现场采用常规浮选工艺处理该矿石,虽能获得合格的铜精矿,但选矿指标不是十分理想。为此,针对矿石性质,以具有较好选择性的LP-01为快速浮选捕收剂、以具有较强捕收能力的Y-89为强化浮选捕收剂进行了分步浮选试验,同时模拟现场工艺进行了对比试验。结果表明:采用分步浮选工艺可获得铜品位为25.61%、铜回收率为83.58%的铜精矿1和铜品位为13.89%、铜回收率为12.36%的铜精矿2,两者合计,综合铜精矿铜品位为23.10%、铜回收率达95.94%;而采用现场工艺获得的铜精矿铜品位为21.86%%、铜回收率为93.88%。相比之下,分步浮选工艺使铜精矿铜品位提高了1.24个百分点、铜回收率提高了2.06个百分点,优越性明显。

A copper ore in Gansu contains 1.6% copper, and copper mainly exists in form of chaleopyrite. However, poor single liberation degree and inconsistent floatability seriously affect the separation of ehalcopyrite. Through the on-site conventional flotation process, qualified copper concentrate was received but its index is nonideal. Therefore, according to the properties of the ore, stage flotation tests are carried out with LP-01 with good selectivity as rapid flotation collector, Y-89 with good collecting ability as intensive flotation collector. Meanwhile, comparison tests with on-site simulation experiments were made. The results showed that by adopting the stage flotation process, copper concentrate 1 with Cu grade of 25.61% and copper recovery of 83.58% and copper concentrate 2 with Cu grade of 13.89% and copper recovery of 12. 36% were obtained respectively. Taking together, the integrated copper concentrate is grading at 23.10% and its copper recovery rate reaches 95.94% ; While by the on-site conventional process, copper concentrate with Cu grade of 21.86% % and copper recovery of 93. 88% was received. In contrast, the stage flotation process improves Ca grade by 1.24% , and Cu recovery by 2. 06% with obvious superiority.