新疆某低品位铜钼矿石浮选回收试验

Recovery Test of a Low-grade Copper-molybdenum Ore in Xinjiang by Flotation

新疆某低品位铜钼矿石中Cu、Mo品位分别为0.81%、0.02%,主要可回收矿物为黄铜矿和辉钼矿,脉石矿物主要为黄铁矿、长石、石英、透辉石、透闪石和方解石等。为有效回收矿石中的铜和钼,针对矿石性质,采用混合浮选工艺开展选矿试验研究。通过单因素试验确定适宜的粗选条件为磨矿细度-0.074 mm占60%,石灰用量500 g/t,六偏磷酸钠用量30 g/t,组合捕收剂总用量60 g/t(丁基黄药与Z-200质量比1∶1),2^(#)油用量15 g/t。在此基础上,采用“1次混浮粗选,3次空白精选,3次扫选”的闭路浮选工艺流程处理矿石,最终可获得Cu品位25.16%、Cu回收率94.02%、Mo品位0.59%、Mo回收率90.21%的铜钼混浮精矿,较好地实现了低品位铜钼矿石中有价金属的综合回收。

The grade of Cu and Mo in a low-grade copper-molybdenum ore in Xinjiang is 0.81%and 0.02%,respectively.The main recoverable minerals are chalcopyrite and molybdenite,and the gangue minerals are mainly pyrite,feldspar,quartz,diopside,tremolite and calcite.In order to recover copper and molybdenum from ore effectively,mixed flotation process was used to carry out beneficiation test aiming at ores propertites.The optimum roughing conditions were determined by single factor test as grinding fineness of-0.074 mm accounting for 60%,lime dosage of 500 g/t,sodium hexametaphosphate dosage of 30 g/t,combined collector total dosage of 60 g/t(mass ratio of butyl xanthate to Z-200 of 1∶1),and 2^(#)oil dosage of 15 g/t.On this basis,the closed-circuit flotation process of"one mixed roughing flotation,three blank cleaning flotation and three scavenging flotation"was adopted to treat the ore.Finally,the copper and molybdenum mixed flotation concentrate with Cu grade of 25.16%,Cu recovery rate of 94.02%,Mo grade of 0.59%and Mo recovery rate of 90.21%could be obtained.The comprehensive recovery of valuable metals from low grade copper molybdenum ore is realized.