提高某铜锌硫化矿石选别指标的试验研究

某铜锌硫化矿随着开采向深部延伸，地质条件发生变化，矿石中出现了大量的磁黄铁矿，且矿物共生关系变得更为复杂。选矿厂按原有铜、锌依次浮选工艺组织生产，选铜时由于磁黄铁矿的干扰和磨矿细度不足而导致铜锌分离效果不佳，选锌时则由于流程结构不尽合理而导致锌回收率较低。针对这些问题开展选矿工艺流程优化研究，在选铜前先通过1次磁选将磁黄铁矿脱除并将入选细度由-0.074 mm占70%提高到-0.074 mm占80%，在选锌时增加1次扫选、1次精选和1次精扫选，最终获得了铜品位为21.68%、锌含量为0.62%、铜回收率为93.14%的铜精矿和锌品位为48.87%、锌回收率为74.92%的锌精矿。与模拟现场工艺流程所获闭路试验指标相比，优化后工艺流程所获铜精矿的铜品位和铜回收率分别提高了0.70和1.45个百分点、锌含量降低了2.83个百分点，所获锌精矿的锌回收率提高了3.67个百分点，优化效果明显。

Experimental Study on Improving Separation Index of a Copper-zinc Sulfide Ore

With the exploration of a copper-zinc sulfide ore extending to the depth，the geological conditions changed a lot，and a great deal of pyrrhotite appears among the ore with a more complex paragenetic relationship with minerals.The plant primarily adopted the original copper and zinc flotation process.The interference of pyrrhotite in copper concentration，and less grinding fineness resulted in worse separation index of copper and zinc，and the unreasonable flow-sheet in zinc separation resulted in lower zinc recovery.In view of these issues，the investigation on beneficiation process is carried out.Before copper concentration，pyrrhotite is removed from the ore by one-stage magnetic separation，and then the ore are re-grounded into -0.074 mm 80% from -0.074 mm 70%.At zinc concentration，the process of one scavenging，one cleaning and one clean scavenging is added to obtain the copper concentrate with Cu grade of 21.68%，Zn content of 0.62% and Cu recovery of 93.14%，and zinc concentrate with Zn grade of 48.87%，and Zn recovery of 74.92%.Compared with the closed-circuit tests index of the simulated field process，Cu grade and Cu recovery were increased by 0.70 percentage points and 1.45 percentage points and zinc content in copper concentrate decreased by 2.83 percentage points by adopting the optimized process.The zinc recovery in zinc concentrate was improved by 3.67 percentage points.Therefore，the optimized process has a good performance.