高效捕收剂ZA在铜硫分离浮选中的应用

西南某多金属硫化矿主要有价元素为铜、锡、硫,铜品位为1.05%、锡品位为0.28%、硫品位为7.19%,伴生银品位为13.20 g/t。铜主要以硫化铜形式存在,占有率为93.60%。现场采用铜硫混合浮选—铜硫分离浮选、浮选尾矿摇床重选选锡的浮重联合流程综合回收矿石中的铜硫银锡(银进入铜精矿),存在石灰用量偏大,碱度高,铜和银回收率偏低的问题。为探索低碱度浮选回收铜银的可能性,以复配药剂ZA为铜矿物捕收剂进行了试验研究。结果表明:将磨矿细度为-0.074 mm占75%条件下以硫酸铜为活化剂、丁基黄药为捕收剂,经1粗2精2扫铜硫混合浮选获得的铜硫混合精矿,以石灰为抑制剂在再磨细度为-0.043 mm占85%、p H=10.5的低碱条件下经1粗3精2扫铜硫分离,最终获得了铜品位为25.16%、银品位为212.2 g/t,铜、银回收率分别为91.75%、61.18%的铜精矿及硫品位35.32%、硫回收率79.08%的硫精矿,有效地实现了矿石中铜银硫的分离富集回收,尤其是强化了游离银的选矿富集。试验结果对伴生贵金属硫化矿中贵金属的综合回收具有借鉴意义。

Application of High Efficient Collector ZA in Separation of Copper from Sulfur Ore

Main valuable elements of a polymetallic sulphide ore in Southwest China is mainly copper, tin and sulphur with grade of 1.05%, 0.28% and 7.19%, respectively, associated silver grade is 13.20 g/t. Copper mainly exists in form of copper sulfide, accounted for 93.60%. Copper and sulphur bulk flotation-copper and sulphur separation, tin concentration from tailings of flotation by shaking table was used by on-site process, all of copper, sulfur, silver and tin were comprehensively recovered (silver went with copper). The process comes with large consumption of lime, high alkalinity, low recovery of copper and silver. In order to find the possibility of effective recover copper and silver with low alkalinity, compound new type ZA collector for copper mineral flotation collector were studied The results show that: copper-sulphur rough concentrate can be obtained at the grinding fineness of 75% passing 0.074 mm, with copper sulfate as activator, butyl xanthate as collector, via one roughing, two cleaning, two scavenging copper-sulphur bulk flotation. After reground the rough concentrate to 85% -0.043 mm, using compound collector ZA as copper collector, lime as inhibitor, with low alkalinity conditions of pH=10.5 through one roughing, three cleaning, three scavenging copper and sulphur separation process, copper concentrate assaying 25.16% Cu and 212.2 g/t Ag at the recoveries of 91.75% and 61.18%, respectively; and the sulphur concentrate containing 35.32% S and recovery of 79.06% can be obtained. The results realize the separation and enrichment recovery of copper, sulphur and silver in the ore, especially intensify beneficiation enrichment of free silver. The test results can provide technique basis for beneficiation of minerals associated precious metals.