玻利维亚多金属锡尾矿含Cu(0.86%)、WO 3(0.64%)和Sn(0.26%)，铜矿物以硅孔雀石为主，部分铜矿物与钨、锡矿物呈固溶体形式产出，钨以黑钨矿为主，锡以锡石为主。采用氯化离析法使铜的矿相发生转变，而钨、锡的矿相未发生转变，从而将铜矿物与钨、锡矿物分离。经过氯化离析?浮选?强磁选?重选选冶工艺综合回收铜、钨、锡条件试验得到以下优化工艺参数：当离析温度为900℃、离析时间为45 min、氯化钙用量为3%、焦炭用量为3%时，一段磨矿细度＜74μm的占95%；强磁选磁场强度H=1.0T时，二段磨矿细度＜38μm的占95%。在此条件下，可分别得到铜品位为25.04%、铜回收率为83.19%的铜精矿，WO 3品位为60.22%、钨回收率为64.26%的钨精矿，锡品位为40.11%、锡回收率为65.69%的锡精矿，实现了玻利维亚锡尾矿中有价金属铜、钨、锡的综合回收利用。
Tin tailings in Bolivia contains Cu (grade of 0.84%), WO 3 (grade of 0.64%) and Sn (grade of 0.84%), the copper mineral is predominately present in chrysocolla, but some copper minerals are output in form of solid solution with tungsten and tin mineral. Tungsten is predominately present in wolframite. Tin is predominately present in cassiterite. Adopting chlorination segregation method makes copper mineral phase change, but tungsten and tin mineral phases don’t be changed, thus the copper mineral is separated from tungsten and tin minerals. After the chlorination segregation-flotation-high intensity magnetic separation-gravity separation, and metallurgy process condition experiment of comprehensive utilization of copper, tungsten and tin, the optimal technological parameters are obtained as follows:the segregation temperature is 950 ℃, segregation time is 45 min, calcium chloride dosage is 3%, coke dosage is 3%, primary grinding fineness <74μm occupies 95%, magnetic field intensity of high intensity magnetic separation H=1.0T, and secondary grinding fineness <38μm occupies 95%. Under the optimal conditions, the copper concentrate with Cu grade of 25.04%and copper recovery of 83.19%, tungsten concentrate with WO 3 grade of 60.22%and tungsten recovery of 64.26%, tin concentrate with Sn grade of 40.11%and tin recovery of 65.59%are gotten, respectively, which realizes the comprehensive utilization of valuable metals of copper, tungsten and tin from tin tailings in Bolivia.
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