Flotation Recovery of Fine−grained Cassiterite from a Copper Tailings Using a Novel Combined Collector
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摘要:
内蒙古某铜尾矿锡品位为0.47%，锡主要以锡石的形式存在，主要赋存于−0.043+0.005 mm细粒级中，具有较高的回收价值。为提升锡石矿物的浮选回收率，采用实验室自制的以羟肟酸为主的新型组合捕收剂KDK−1，对该尾矿开展了浮选实验研究。首先对该尾矿进行脱泥，然后浮选除硫后浮选锡，在调整剂六偏磷酸钠120 g/t、捕收剂KDK−1
2000 g/t、辅助捕收剂PBL 50 g/t、起泡剂松醇油10 g/t的粗选条件下，采用“一粗三精二扫”的闭路浮选实验流程，可获得锡品位为6.07%、回收率为73.10%的锡精矿。该组合捕收剂对锡石捕收效果良好，优于丁铵黑药，可高效回收铜尾矿中锡资源，并为今后低品位微细粒锡石的高效回收和新型捕收剂的开发提供了参考。Abstract:The flotation recovery of tin minerals in copper tailings with a tin grade of 0.47% was investigated through an experiment conducted in Inner Mongolia. Cassiterite, the primary form of tin, predominantly occurred in the fine grain size range of −0.043+0.005 mm and exhibited significant recovery potential. In order to improve the flotation recovery rate of cassiterite, a novel combined collector named KDK−1, composed mainly of hydroxamic acid and synthesized in the laboratory, was employed for conducting flotation experiments on the tailings. The tailings were first deslimed, followed by sulfur removal and subsequent tin flotation processes. Using 120 g/t sodium hexametaphosphate as a regulator, 2000 g/t KDK−1 as a collector, 50 g/t PBL as an auxiliary collector, and 10 g/t pine oil as a frother, closed circuit flotation experiments using "one rougher−three cleaners−two scavengers" process resulted in a tin concentrate with a grade of 6.07% and a recovery rate of 73.10%. The combined collector has a good collection effect on cassiterite, which is better than ammonium butyrate black, and can efficiently recover tin resources in copper tailings. It also provides a reference for the efficient recovery of low−grade fine cassiterite and the development of new collectors in the future.
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Key words:
- hydroxamicacid /
- combined collector /
- flotation /
- fine cassiterite /
- copper tailings
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表 1 化学多元素分析结果
Table 1. Chemical multielement analysis results
元素 Sn S Al2O3 SiO2 CaO MgO K2O 含量/% 0.47 0.33 18.62 68.35 0.82 0.77 1.62 
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表 2 样品中锡物相分析结果
Table 2. Results of tin phase analysis of ore
锡物相 黝锡矿 锡石 总锡 含量/% 0.12 0.43 0.55 分布率/% 21.82 78.18 100.00
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表 3 样品粒度组成分析结果
Table 3. Analysis results of sample particle size composition
粒级/mm 产率/% Sn品位/% Sn分布率/% +0.043 6.36 0.75 9.98 −0.043+0.02 13.53 1.21 34.26 −0.02+0.01 14.13 0.71 20.99 −0.01+0.005 12.53 0.43 11.28 −0.005 53.45 0.21 23.49 小计 100.00 0.48 100.00
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表 4 脱硫闭路实验结果
Table 4. Desulfurization closed−circuit experimental results
/% 产品名称 产率 品位 回收率 Sn S Sn S 硫精矿 3.93 0.73 8.25 4.87 84.92 硫尾矿 96.07 0.58 0.06 95.13 15.08 给矿 100.00 0.59 0.38 100.00 100.00
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表 5 闭路实验结果
Table 5. Closed circuit experimental results
/% 产品名称 产率 Sn品位 Sn回收率 浮锡精矿 7.02 6.07 73.10 尾矿 92.98 0.17 26.90 给矿 100.00 0.58 100.00
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