国外某铜矿石含铜较高，氧化率较低，为原生硫化铜矿石，铜品位达1.21 %，而铅、钴、锌等其他金属含量较低，不具备综合回收利用价值。为最大化该矿石的经济效益，进行浮选药剂优化试验。试验结果表明：在磨矿细度-0.074 mm占比75 %，石灰用量500 g/t，Z-200用量30 g/t条件下，采用一粗两精两扫、中矿循序返回的工艺流程，闭路试验可获得铜品位 31.09 %、铜回收率97.62 %的铜精矿，尾矿铜品位仅为0.03 %。试验结果为同类型矿石的选矿工艺改造和药剂优化提供数据支撑，也为企业提质降耗奠定了坚实基础。  

A copper ore from abroad is characterized by a high copper content and a Iow oxidation rate, indicating that it is a primary sulfide copper ore. The copper grade reaches 1.21 %, while the contents of other metals such as lead, cobalt, and zinc are relatively Iow, lacking economic value for comprehensive recovery. To maximize the economic benefit of this ore, a flotation reagent optimization test was carried out. Test results show that under the conditions of grinding fineness with -0.074 mm accounting for 75 %, lime dosage of 500 g/t, and Z-200 dosage of 30 g/t, using a process flow of one roughing, two cleanings, and two scavengings with staged return of selected middlings, the closed-cireuit test yielded a copper concentrate with a grade of 31.09 % and a recovery rate of 97.62 %, while the copper grade in the tailings was only 0.03 %. The test results provide data support for the beneficiation process improvement and reagent optimization of similar types of ore, laying a solid foundation for enterprises to improve quality and reduce consumption.