云南某铜锡尾矿脱硫选锡试验研究

Experimental Study on Desulfurization and Tin Beneficiation of Tailing Generated from a Copper-Tin Mine in Yunnan Province

云南某铜锡尾矿含锡0.65%,含铁43.58%,具有较高的回收价值。为实现该尾矿资源的综合利用,基于工艺矿物学研究结果,对该尾矿进行脱硫浮选,脱硫尾矿再浮选锡石的试验研究。结果表明,该尾矿锡和铁为主要回收元素,杂质硫含量为1.59%;锡主要以锡石的形式存在,与氧化铁矿物致密共生,与硫铁矿物基本解离;锡在-0.074 mm分布率达69.48%,在-0.038 mm分布率也高达24.92%,高细粒级含量将会影响后续锡石的浮选回收;预先脱硫浮选获得的泡沫产品硫总回收率为72.13%、锡回收率为6.88%,脱硫尾矿硫含量仅为0.51%,达到了铜锡尾矿预先脱硫的目的;脱硫尾矿采用1粗2精2扫选锡,获得锡品位1.63%、锡回收率63.96%的锡精矿,实现了尾矿中锡资源的有效回收。

A copper-tin tailings in Yunnan contains tin of 0.65%and iron of 43.58%,which has high recovery value.In order to realize the comprehensive utilization of the tailings resources,the desulfurization flotation of the tailings and cassiterite flotation of the desulfurization tailings was conducted based on the results of process mineralogy.The results showed that tin and iron are the main elements recovered from the tailings and the contents of impurity sulfur is 1.59%.Tin mainly exists in the form of cassiterite,which is closely associated with iron oxide minerals and basically dissociated from pyrite minerals.The distribution rate of tin with-0.074 mm is 69.48%,and the distribution rate of tin with-0.038 mm is also as high as 24.92%.The content of high fine particles will affect the subsequent flotation recovery of cassiterite.The total sulfur recovery of foam products obtained by pre-desulphurization flotation is 72.13%with the tin recovery rate of 6.88%,and the sulfur content in desulphurization tailings is only 0.51%,which achieves the purpose of pre-desulphurization of copper-tin tailings.A tin concentrate with tin grade of 1.63%and tin recovery rate of 63.96%were obtained by one roughing,two cleaning and two scavenging,which realized the effective recovery of tin resources in the tailings.