西南某低品位硫化铅锌矿选矿试验研究

Experimental Study on Beneficiation of a Low Grade Lead-zinc Sulfide Ore in Southwest China

西南某低品位铅锌矿石铅品位为2.99%、锌品位为1.57%,伴生银品位为10.80 g/t,铅、锌均主要以硫化物的形式存在。为高效开发利用该低品位矿石,对原矿分别进行了重液浮沉试验及浮选条件试验研究。结果表明:(1)针对-12 mm原矿进行重液浮沉试验,在重介质悬浮液密度为2.7 kg/m3时,密度大于2.7 kg/m3产品的铅品位为10.48%、锌品位为5.37%,相对原矿品位富集近3倍;密度小于2.7 kg/m3产品的铅、锌损失率较低,分别为4.48%和6.62%。(2)原矿在低碱度矿浆体系下,采用铅优先浮选—锌硫混选再分离的流程处理,最终可获得铅品位69.26%、铅回收率95.21%的铅精矿和锌品位59.83%、锌回收率84.26%的锌精矿,指标良好。研究结果说明了该矿石预选抛尾及低碱度浮选的可行性,对低品位铅锌矿开发利用具有一定的实践意义。

In a low-grade lead-zinc ore in southwest China,the lead grade is 2.99% and the zinc grade is 1.57%. The associated silver grade in the ores is 10.80 g/t. Both lead and zinc mainly exist in the form of sulfide. In order to efficiently develop and utilize the low-grade ores,the heavy liquid floating sinking test and the flotation conditions tests of the raw ore were studied. The results showed that:(1) The tests for floating sinking were carried out with heavy liquid aiming at the raw ores below 12 mm. When the density of heavy-medium suspension is 2.7 kg/m3,the lead grade and zinc grade of density greater 2.7 kg/m3 product are 10.48% and 5.37%,respectively,which is nearly three times higher than that of the raw ores. The loss rates of lead and zinc in density less than 2.7 kg/m3 products were 4.48% and 6.62%,respectively.(2) The lead concentrate with lead grade of 69.26% and lead recovery rate of 95.21%,and zinc concentrate with zinc grade of 59.83% and zinc recovery of84.26% were finally obtained from the raw ore in the low alkalinity pulp system by the flowsheet scheme of lead priority floatation,zinc and sulfur mixing flotation and then separation. The research results showed the feasibility of pre-separation and low alkalinity flotation of the ore,which has certain practical significance for the development and utilization of this kond of low grade lead-zinc ore.