云锡卡房铜硫浮选尾矿中细粒锡石的回收

Recovery of Fine Cassiterite from Flotation Tailings of Copper-sulfide in Kafang,Yunxi

云锡个旧卡房公司铜硫浮选尾矿锡品位为0.35%,主要含锡矿物锡石不仅嵌布粒度微细,与脉石矿物嵌布关系紧密,而且可浮性或密度也与脉石矿物较接近,导致现场的单一重选工艺仅能获得锡品位为6%左右、锡回收率为50%左右的锡精矿。为高效回收该尾矿中的锡资源,采用浮选—重选工艺进行了选矿试验。结果表明:通过1粗2精2扫闭路浮选,可获得锡品位为8.26%、锡回收率为83.51%的浮选锡精矿;浮选锡精矿通过1次摇床重选,可获得锡品位为40.70%、回收率为68.95%的重选精矿,以及锡品位为1.72%、回收率为14.56%的重选尾矿,该重选尾矿可作为烟化工艺回收锡的原料。因此,试验确定的工艺流程是该尾矿的高效选锡流程。

Tin grade of copper-sulfide flotation tailings from Kafang Company in Gejiu County,Yunxi,is 0. 35%. Cassiterite,the main tin bearing mineral,is micro-fine disseminated and closely disseminated with gangue minerals which have closely floatability and density with cassiterite. Therefore,tin concentrate of flotation assaying about 6% tin and recovery of about50% was obtained through the single gravity separation process,In order to efficiently recover tin resources from the tailings,the flotation-gravity separation process was used for dressing experiment. Results showed that through the process of one roughing,two cleanings,two scavenge closed circuit flotation process tin concentrate with 8. 26% tin and recovery of 83. 51% was obtained. Gravity concentrate with 40. 70% tin and recovery of 68. 95% was obtained by once shaking table gravity separation dealing with flotation tin concentrate,as well as gravity tailings with 1. 72% tin and recovery of 14. 56%. The tailings of gravity separation can be used as raw material for tin recover via fuming process. Therefore,the technological process is a high efficient process to recover tin from tailings.