Experimental Study on Mineral Processing of a Complex Refractory Gold Mine in Guizhou
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摘要:
贵州某金矿原矿主要有回收利用价值的金矿物，原矿品位含金3.47 g/t,含硫5.12%，现场在常温条件下，用丁基黄药为捕收剂进行生产，金精矿的回收率为78.34%，金精矿品位为39.21 g/t，选矿指标不理想，造成资源浪费，严重影响企业的经济效益，针对这一情况，对该金矿进行实验研究。通过对矿浆进行加温，同时研究对该矿捕收效果良好的捕收剂丁铵黑药和丁基黄药按1:1使用，实验矿浆温度控制在50～55 ℃，与现场生产比较，金精矿浮选指标得到较大提高，实验室闭路实验得到实验结果为金精矿的品位44.86 g/t，金精矿金的回收率达到91.01%，为企业进行生产工艺流程改造提供技术依据。
Abstract:The gold mineral is the main one with recycling value in the raw ore of a gold mine in Guizhou. The gold grade of the raw ore is 3.47 g/t and the sulfur content is 5.12%. The recovery rate of the gold concentrate is 78.34% and the grade of the gold concentrate is 39.21 g/t when butyl xanthate is used as the collector for production at normal temperature. The beneficiation index is not ideal, resulting in a waste of resources. It seriously affects the economic benefit of the enterprise. In view of this situation, the experimental study is carried out on the gold mine. By heating the pulp and using the collector ammonium butyl aerofloat and butyl xanthate with good collection effect at the ratio of 1:1, the temperature of the test pulp is controlled at 50～55 ℃. Compared with the field production, the flotation index of the gold concentrate is greatly improved. The results of closed-circuit test in laboratory showed that the grade of gold concentrate was 44.86 g/t, and the recovery rate of gold concentrate was 91.01%, which provides technical basis for enterprises to reform the production process.
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Key words:
- Mineral processing engineering /
- Gold mine /
- Flotation test /
- Heating /
- Closed-circuit test
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表 1 原矿化学成分分析结果/%
Table 1. Analysis results of chemical composition of raw ores
Au* Pb Zn S CaO Ag* SiO2 Al Mg 其他 3.47 0.08 0.12 5.12 7.18 6.12 37.23 18.42 11.38 20.18 *单位为g/t。 
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表 2 矿石金矿物的物相分析结果
Table 2. Phase analysis results of gold minerals
名 称 黄铁矿 硅矿物 自然金 总 金 Au/（g/t） 2.63 0.82 0.02 3.47 分布率/% 72.16 23.66 4.18 100.00
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表 3 矿石硫矿物的物相分析结果
Table 3. Phase analysis results of sulfur minerals
名 称 硫化物 硫酸盐 自然硫 总 硫 S/% 4.87 0.23 0.02 5.12 分布率/% 95.17 4.45 0.38 100.00
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表 4 常温下开路实验结果
Table 4. Open-circuit test results at normal temperature
产 品 产率/% 品位/(g/t) 回收率/% 金精矿 5.37 42.11 65.19 中矿1 6.09 3.17 5.56 中矿2 3.23 10.18 9.47 尾 矿 85.31 0.80 19.78 给 矿 100.00 3.47 100.00
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表 5 加温下的开路浮选实验结果
Table 5. Open-circuit flotation test results at elevated temperature
产 品 产率/% 品位/（g/t） 回收率/% 金精矿 6.05 43.13 75.21 中矿1 4.78 3.88 5.35 中矿2 3.29 11.12 10.53 尾 矿 85.88 0.36 8.91 给 矿 100.00 3.47 100.00
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表 6 闭路实验结果
Table 6. Closed-circuit test results
产 品 产率/% 品位/（g/t） 回收率/% 金精矿 7.04 44.86 91.01 尾 矿 92.96 0.33 8.99 给 矿 100.00 3.47 100.00
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