某高硫铁铜矿石铜硫选矿试验

Beneficiation Experiment on Copper and Sulfur of a High-sulfur and High-iron Copper Ore

粤北某高硫铁难选铜矿石中铜矿物绝大部分为黄铜矿,含硫矿物主要为黄铁矿,其次为磁黄铁矿,脉石矿物主要为石英、正长石、白云母、透闪石、方解石、绿泥石,主要有回收价值的元素为铜、硫。原生硫化铜占总铜的87.60%,次生硫化铜占总铜的11.81%;非磁性硫占总硫的62.02%,磁性硫占总硫的37.62%。为确定该矿石的合理铜、硫回收工艺,进行了选矿试验研究。结果表明,矿石在磨矿细度为-0.074 mm占75%的情况下,采用1粗3精2扫、中矿顺序返回(精选1、扫选1中矿合并再磨后返回)流程浮铜,浮铜尾矿1次弱磁选磁黄铁矿,弱磁选尾矿1粗2扫流程浮选黄铁矿,可获得铜品位为19.89%、铜回收率为82.07%的铜精矿,硫品位为33.18%、硫回收率为29.11%的磁性硫精矿,以及硫品位为43.75%、硫回收率为55.26%的硫精矿,总硫回收率达84.37%,该工艺有效地回收矿石中的铜、硫资源。

There is a high-sulfur and high-iron refractory copper ore in Northern Guangdong Province. Main copper mineral is chalcopyrite,main sulfur minerals are pyrite and pyrrhotite,main gangue minerals are quartz,potash feldspar,muscovite,tremolite,calcite and chlorite,the main valuable elements are copper and sulfur. Primary copper sulfide accounted for 87.60% of total copper,and secondary copper for 11.81% of total copper; 62.02% sulfur exists in the form of non-magnetic sulfur minerals,and 37.62% sulfur exists as pyrrhotite. To determine separation technology on the copper-sulfur ore,beneficiation experiment was conducted. The results indicated that,at the grinding fineness of 75% passing 0.074 mm,via one roughing three cleaning one scavenging copper flotation,middlings back to the flow-sheet in turn（one concentrate tailings and one scavenging concentrate are mixed and returned to grinding after combined）,copper tailings floating pyrrhotite by one stage low intensity magnetic separation,tailings via one roughing two scavenging pyrite flotation,copper concentrate with Cu grade of 19.89% and Cu recovery of 82.07%,and pyrrhotite concentrate with S grade of 33.18%,and S recovery of 29.11%,sulfur concentrate with S grade of 43.75% and S recovery of 55.26%were obtained,total S recovery of 84.37%. The process effectively recovered copper and sulfur resources in the ore.