云南某铜矿石浮选试验

云南某铜矿石铜品位为2.54%、银品位为76.24 g/t,有害元素砷含量低。矿石中以游离氧化铜形式存在的铜占总铜的42.31%;以结合氧化铜形式存在的铜占总铜的10.84%,这部分铜较难回收;以原生硫化铜形式存在的铜占总铜的38.58%,这部分铜较易回收。为开发利用该矿石,对其进行了选矿试验研究。结果表明:在磨矿细度为-0.074 mm占78.91%条件下,以碳酸钠为调整剂、水玻璃为脉石抑制剂、丁基黄药为捕收剂、2号油为起泡剂经1粗3精流程进行硫化铜浮选,硫化铜浮选尾矿以D_2为活化剂、硫化钠+硫酸铵为调整剂、丁铵黑药+异戊基黄药为捕收剂、2号油为起泡剂经1粗3精2扫氧化铜浮选,获得了铜品位为21.16%、铜回收率为78.70%、银品位为568.35g/t、银回收率70.38%的铜精矿,可以为该矿石资源的开发利用提供技术依据。矿石中含有10.84%的结合氧化铜是造成精矿铜回收率较低的原因。

Flotation Experiment on a Copper Ore from Yunnan

There is 2.54% copper,70.24 g/t silver in a copper ore from Yunnan,with low content of harmful element arsenic. 42.31% copper present in free copper oxide form; 10.84% copper present in bind copper oxide form,which is hard to be recovered; 38.58% copper sulfide exists in the form of primary copper sulfide,which is easy to be recovered. Beneficiation experiments were conducted to develop and utilize the ore. The results indicated that at the grinding fineness of 78.91% passing 0.074 mm,with sodium carbonate as regulator,sodium silicate as gangue inhibitor,butyl xanthate as collector and pine oil as frothing agent via sulfide copper flotation by one roughing-three cleanings operation. Tailings of sulfide copper flotation with D² as activator,sodium sulfide and ammonium sulfate as regulator,ammonium butyl aerofloat and isoamyl xanthate as collector and pine oil as frothing agent via oxide copper flotation by one roughing-three cleanings-two scavenging operation. Copper concentrate with copper grade of 21.16%,copper recovery of 78.70%,silver grade of 568.35 g/t,silver recovery of 70.38% was obtained. The results can provide technique basis for reasonably recovery of the resource. There is 10.84% combined copper oxide in the ore is the cause of lower copper concentrate recovery.