Experimental Research on Mineral Processing for a Refractory Fine Disseminated Copper Sulfide Ore in Tibet
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摘要:
西藏某细粒嵌布难选硫化铜矿含铜0.45%，含硫3.1%，铜氧化率9.91%，矿石中铜矿物以黄铜矿为主，黄铜矿分布极不均匀，部分呈微细粒状，与脉石不易单体解离，是影响铜矿物回收的重要因素。实验采用铜硫混浮、粗精矿再磨后铜硫分离、铜硫混浮尾矿脱硫的工艺流程，药剂制度以石灰为调整剂，A4和丁铵黑药为铜矿物捕收剂，戊基黄药为黄铁矿捕收剂，MIBC为起泡剂，闭路实验取得了良好的选矿技术指标：铜精矿铜品位25.32%，铜回收率85.56%；金品位21.02 g/t，金回收率63.37%；银品位119.25 g/t，银回收率80.53%。同时，获得一个含硫19.82%、回收率78.20%的硫精矿，矿石中的黄铁矿得到综合回收。
Abstract:The refractory fine disseminated copper sulphide ore in Tibet contains 0.45% copper and 3.1% sulfur, and the oxidation rate of copper is 9.91%.The uneven distribution of chalcopyrited and some ores showed the micro-fine-grained make it difficult to liberate with gangne, and it is the important factor influencing copper recovery. The Cu-S bulk flotation, copper-sulphur separation did not be improved after the re-grinding of primary concentrate and desulfurization flowsheet is adopted. The reagent regime for the ore is that lime is as pH regulator, A4 and ammonium dibutyl dithiophosphate were used as collectors for copper mine, amyl xanthate was used as collector for pyrite and MIBC was used as foaming agent. The good technical index had been achieved: the copper concentrate with Cu grade of 25.32% and Cu recovery of 85.56%; Au grade of 21.02 g/t and Au recovery of 63.37%; Ag grade of 119.25 g/t and Au recovery of 80.53%. Meanwhile, a sulfur concentrate with S grade of 19.82% and S recovery of 78.20% was obtained, realizing comprehensive utilization of sulfur in the ore.
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表 1 矿石多元素分析/%
Table 1. Chemical analysis of multi-elments
Cu Pb Zn Fe S SiO2 MgO CaO Al2O3 Au* Ag* 0.45 0.014 0.15 5.53 3.1 61.91 0.91 0.28 13.99 0.52 2.5 *单位为g/t。 
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表 2 铜物相分析
Table 2. Analysis results of copper phase
相别 原生硫化铜 次生铜 氧化物 总铜 含量/% 0.34 0.056 0.047 0.443 占有率/% 77.84 12.25 9.91 100.00
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表 3 捕收剂种类选择实验结果
Table 3. Results of the collector types
捕收剂种类及用量/（g·t-1） 产品名称 产率/% 铜品位/% 铜回收率/% 乙基黄药 80 铜粗精矿 6.53 5.14 75.27 粗选尾矿 93.47 0.118 24.73 原 矿 100.00 0.45 100.00 乙硫氮 80丁基黄药 80 铜粗精矿 7.93 4.63 82.09 粗选尾矿 92.07 0.087 17.91 原 矿
铜粗精矿100.00
12.300.45
3.14100.00
87.48粗选尾矿 87.70 0.063 12.52 原 矿 100.00 0.44 100.00 戊基黄药 80 铜粗精矿 12.90 3.09 89.10 粗选尾矿 87.10 0.056 10.90 原 矿 100.00 0.45 100.00 A4 80 铜粗精矿 12.47 3.26 89.76 粗选尾矿 87.53 0.053 10.24 原 矿 100.00 0.45 100.00
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表 4 尾矿脱硫药剂筛选实验
Table 4. Results of desulfurizing agent for tailings
调整剂、捕收剂用量/（g·t-1） 产品名称 产率/% 硫品位/% 硫回收率/% 戊基黄药 50 铜粗精矿 13.82 20.45 92.24 中矿1 3.69 1.08 1.30 粗扫选尾矿 82.49 0.24 6.46 原 矿 100.00 3.06 100.00 戊基黄药 200 铜粗精矿 13.86 20.37 92.35 中矿1 2.37 1.38 1.07 粗扫选尾矿 83.77 0.24 6.58 原 矿 100.00 3.06 100.00 戊基黄药 300MIBC 60 铜粗精矿 13.84 20.42 92.58 中矿1 4.67 1.01 1.55 粗扫选尾矿 81.49 0.22 5.87 原 矿 100.00 3.05 100.00 硫酸铜 200戊基黄药 200 铜粗精矿 13.85 20.39 91.81 中矿1 1.72 2.37 1.33 粗扫选尾矿 84.43 0.25 6.86 原 矿 100.00 3.08 100.00 碳酸氢铵 800戊基黄药 200 铜粗精矿 13.81 20.48 92.65 中矿1 2.05 1.09 0.73 粗扫选尾矿 84.14 0.24 6.62 原 矿 100.00 3.05 100.00
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表 5 闭路实验结果
Table 5. Results of closed-circuit tests
产品名称 产率/% 品位/% 回收率/% Cu S Au* Ag* Cu S Au Ag 铜精矿 1.52 25.32 31.71 21.02 119.25 85.56 15.45 63.37 80.53 硫精矿 12.31 0.22 19.82 0.52 1.18 6.02 78.20 12.70 6.45 尾矿 86.17 0.044 0.23 0.14 0.34 8.42 6.35 23.93 13.02 原 矿 100.00 0.45 3.12 0.50 2.25 100.00 100.00 100.00 100.00 *单位为g/t。
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