Flotation of an Arsenic Bearing High Sulfur Gold Mine in Gansu Province
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摘要:
这是一篇矿物加工工程领域的论文。某含砷高硫金矿中金矿物与黄铁矿、毒砂共生关系密切，在实际生产过程中精矿金回收率不理想。为提高精矿金回收率，同时兼顾精矿金品位，针对该矿物特点，通过系统条件实验、浮选时间实验和精选实验得到了浮选工艺参数和流程，继而开展开路实验和闭路实验，获得了较好的浮选指标。为进一步提升浮选指标，对浮选中矿进行再磨再浮实验，并对中矿再磨浮选尾矿进行氰化浸出实验，最终得到金选冶总回收率91.94%的满意指标。
Abstract:This is an article in the field of mineral processing engineering. The gold mineral in an arsenic bearing high sulfur gold mine has a close symbiotic relationship with pyrite and arsenopyrite, and the recovery rate of concentrate gold is not ideal in the actual production process. In order to improve the recovery rate of concentrate gold and take into account the grade of concentrate gold, according to the characteristics of this mineral, the flotation process parameters and process are obtained through system condition test, flotation time test and beneficiation test, and then the open circuit test and closed circuit test are carried out to obtain better flotation indexes. In order to further improve the flotation index, the regrinding and flotation test of flotation middling is carried out, and the cyanide leaching test of middling regrinding flotation tailings is carried out. Finally, the satisfactory index of 91.94% of the total recovery of gold dressing and metallurgy is obtained.
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Key words:
- Mineral processing engineering /
- Mineralogical technology /
- Arsenic /
- High sulfur /
- Middling regrinding
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表 1 化学有效元素分析结果/%
Table 1. Chemical active element analysis results
Au* Ag* Cu Pb Zn Fe S As SiO2 Al2O3 MgO CaO Na2O K2O 6.64 2.62 0.013 0.027 0.015 14.47 3.69 1.65 18.99 1.12 0.80 23.45 0.03 0.36 *单位为 g/t 
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表 2 样品中金矿物解离特征
Table 2. Dissociation characteristics of gold minerals in samples
解离度
X单体
X=100%75%≤X＜100% 50%≤X＜75% 25%≤X＜50% 0＜X＜25% 包裹
X=0合计 含量/% 4.60 10.07 57.97 2.54 0.89 23.93 100.00
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表 3 样品中主要金矿物嵌布程度统计
Table 3. Statistics of embedding degree of main gold minerals in the samples
矿物 单体/% 共生体/% 合计/% 黄铁矿 黄铁矿和毒砂 毒砂 毒砂和菱铁矿 菱铁矿 含量/% 4.60 74.32 7.76 4.49 6.82 2.01 100.00
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表 4 主要矿物粒度分布情况
Table 4. Particle size distribution of main minerals
粒级/μm 黄铁矿 毒砂 含量/% 正累积/% 含量/% 正累积/% +104 4.79 4.79 4.03 4.03 -104+74 10.73 15.52 8.11 12.14 -74+38 42.04 57.56 36.37 48.51 -38+20 24.60 82.16 30.30 78.81 -20+15 5.98 88.14 7.42 86.23 -15+10 5.03 93.17 5.25 91.48 -10+5 5.01 98.18 6.19 97.67 -5 1.82 100 2.33 100 平均粒径 47.46 43.57
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表 5 主要矿物嵌布特征
Table 5. Distribution characteristics of main minerals
矿物名称 单体/% 共生体/% 合计/% 金属硫化物 其他脉石矿物 黄铁矿 14.08 6.85 79.07 100.00 毒砂 19.47 3.18 77.35 100.00
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表 6 开路实验结果
Table 6. Test results of open circuit
样品名称 产率/% 金品位/（g/t） 金回收率/% 精矿 11.31 42.79 72.99 精尾 9.38 11.66 16.50 扫Ⅰ精 2.33 8.40 2.95 扫Ⅱ精 1.59 4.12 0.99 尾矿 75.39 0.58 6.57 合计 100.00 6.63 100.00
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表 7 闭路实验结果
Table 7. Results of closed circuit test
产物名称 作业产率/% 金品位/（g/t） 金回收率/% 精矿 14.63 37.18 82.17 尾矿 85.37 1.38 17.83 合计 100.00 6.62 100.00
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表 8 精尾和扫精混合再磨浮选实验结果
Table 8. Flotation test results of cleaner tailings and scavenger concentrate mixed Regrinding
样品名称 产率/% 金品位/（g/t） 金回收率/% 精矿 15.27 35.48 81.71 中矿浮精 2.75 14.84 6.15 合计（综合精矿） 18.02 32.34 87.86 中矿浮尾 7.85 4.45 5.30 尾矿 74.13 0.61 6.84 合计（综合尾矿） 81.98 0.98 12.14 总计 100.00 6.63 100.00
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表 9 再选精矿浮选实验结果
Table 9. Flotation test results of Scavenger concentrate regrinding
样品名称 产率/% 金品位/（g/t） 金回收率/% 粗精 18.39 32.03 88.57 再选精矿 1.36 12.01 2.45 合计（综合精矿） 19.75 30.60 91.02 再选尾矿 6.51 2.75 1.92 尾矿 73.76 0.58 6.43 合计（综合尾矿） 80.27 0.76 8.98 总计 100.00 6.65 100.00
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