云南铜、锡、铁多金属尾矿综合利用试验研究

Comprehensive Utilization Research on Polymetallic Tailings with Copper,Tin and Iron in Yunnan

云南多金属尾矿试样含Cu品位为0.62%、Sn品位为0.12%、Fe品位为36.22%,属于低品位有价多金属尾矿。试样中铜以结合氧化铜为主,同时有部分铜与锡、铁矿物呈固溶体形式产出,锡以锡石为主,铁以赤铁矿为主。采用氯化离析矿相重构法,使铜从结合氧化铜转变为金属铜后,采用浮选回收铜,初步实现铜的有效分离;采用弱磁选—摇床重选回收浮选尾矿中的锡和铁。实验结果表明,在离析温度为950℃、氯化钙用量为3%,焦炭用量为5%、离析时间为75 min的离析综合条件下,氯化离析—浮选—弱磁选—重选的冶选联合工艺处理该多金属尾矿综合回收其中的有价金属铜、锡、铁,得到的分选指标为:铜品位为19.87%,铜回收率为83.25%的铜精矿;铁品位为58.31%,铁回收率为61.58%的铁精矿;锡品位为40.12%,锡回收率为47.02%的锡精矿。

The polymetallic tailings sample with Cu of 0.672%, Sn of 0.12%, and Fe of 36.22% in Yunnan province belonged to low grade polymetallic valuable railings. Copper was mainly in the form of combined copper oxide, meanwhile some copper were in sol- id solution form with tin and iron mineral, tin was mainly in the form of cassiterite, iron was mainly in the form of hematite and limonite in the sample. Copper was transformed from combined copper oxide into metallic copper by chlorination segregation mineralogical phase reconstruction method and was recovered by flotation to realize effective separation of copper preliminary ; tin and iron were recovered by low intensity magnetic separation-table gravity separation from flotation tailings. The results showed that the metallurgy-benefication joint flowsheet of chlorination segregation-flotation-low intensity magnetic separation-gravity separation process could recover valuable metals of copper, tin, iron from the polymetallic railings with the following separation indexes： copper concentrate of 19.87% copper, copper recovery of 83.25 % ; iron concentrate of 58.31% iron, iron recovery of 61.58% ; tin concentrate of 40.12% tin, tin recovery of 47.02% under chlorination temperature of 950 ℃ with calcium chloride of 3% , coke of 5% , segregation time of 75 min.