Study on Separation of Gold from Tailings by Combined Floatation-Gravity Beneficiation Flowsheet
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摘要:
绵阳某金尾矿含金0.8 g/t、含硫 1.24%、含碳3.45%，金矿物主要以单体-连生体以及铁等氧化物包裹金的形式存在，脉石矿物有石英、硅酸盐、有机碳等，属于高碳低金矿。采用浮-重选联合流程，实验获得产率为3.06%，金品位为12.7 g/t，回收率为48.52%的浮选精矿，同时获得产率为2.82%，金品位为4.54 g/t，回收率为16.02%的摇床精矿，尾矿中金含量仅为0.23 g/t，为综合回收该尾矿中的金提供了技术依据。
Abstract:A gold tailings in Mianyang contains 0.8 g/t gold, 1.24% sulfur and 3.45% carbon, and the gold mainly existing as particles, intergrowth with gangue minerals and wrapped in iron oxides. The gangue minerals are mainly quartz, silicate and organic carbon, etc, which named as high carbon and low gold deposit. The combined beneficiation flowsheet was developed to recovery gold, and good results were achieved. Flotation concentrate with a yield of 3.06% and grade of 12.7 g/t was achieved, which makes up 48.52% of total gold. Meanwhile, gravity concentrate with a yield of 2.82% and grade of 4.54 g/t was achieved, account for 16.02% of total gold. The final tailing with grade of 0.23 g/t was obtained. Therefore, the developed beneficiation flowsheet provides a technical basis for comprehensive recovery of tailings.
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Key words:
- Tailings /
- Flotation /
- Gravity separation /
- Combined beneficiation flowsheet
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表 1 金矿多元素分析结果/%
Table 1. Results of multi-element analysis of gold ore
Au* As TFe S Sn Cu Pb Ag* 0.80 0.04 5.36 1.24 0.043 0.011 0.008 未检出 Al2O3 CaO MgO SiO2 Cd Cr C Hg* 7.98 2.01 3.51 58.54 0.001 0.013 3.45 0.25 *单位为g/t。 
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表 2 金物相分析结果
Table 2. Metallographic analysis results
相别 单体金+连
生金硅酸盐
中金硫化物中
包裹金铁等氧化矿物中
包裹金总金 含量/（g·t-1）
占有率/%0.36
45.000.09
11.250.06
7.500.29
36.250.80
100.00
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表 3 矿石主要矿物组成/%
Table 3. Main mineral composition of ore
矿物 石英 绢云母 方解石 白云石 石墨碳质 黄铁矿 褐铁矿 黄铜矿 方铅矿 闪锌矿 含量 73.82 11.24 3.16 2.98 3.83 2.71 1.86 微量 微量 微量
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表 4 联合工艺实验结果
Table 4. Combined process experimental results
名称 产率/% 品位/% 回收率/% 金 * 碳 金 碳 金精矿1 3.06 12.7 5.12 48.52 4.12 金精矿2 2.82 4.54 3.45 16.02 2.56 中矿 11.08 0.84 4.56 11.59 13.27 尾矿 83.04 0.23 3.67 23.87 80.06 原矿 100 0.8 3.81 100 100.00 *单位为g/t。
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