Research on Optimizing Particle Size Composition of Grinding Products of Dongguashan Copper Mine to Improve Flotation Index
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摘要: 针对冬瓜山入浮颗粒粒度较粗且粒度组成分布不合理问题，基于磨矿产品的粒度分布及矿石力学性质对磨矿介质配比进行调整以优化入浮颗粒的粒度组成，结果表明：冬瓜山一段磨矿介质尺寸方案为m（φ60）：m（φ40）：m（φ30）：m（φ25）=40：10：30：20，采用推荐方案可提高磨矿产品中-0.1+0.01 mm颗粒产率2.28%。推荐方案与现场方案磨矿产品经一粗两精两扫的浮选闭路对比试验，推荐方案铜精矿回收率90.11%，较现场方案提高1.34%，精矿品位提高了0.94%。对浮选尾矿筛分并检测分析可知推荐方案磨矿产品在-0.1+0.01 mm颗粒中铜的回收效果优于现场方案，利用推荐的介质配比方案优化磨矿产品粒度组成，有效提高了冬瓜山选铜浮选指标。Abstract: In order to solve the problem of coarse and unreasonable particle size composition distribution in Dongguashan, the particle size composition of floating particles was optimized by adjusting the proportion of grinding medium based on the particle size distribution of grinding products and the dynamics properties of ores. The results showed that the size scheme of one stage of grinding media in Dongguashan is m (φ60):m (φ40):m (φ30):m (φ25) = 40:10:30:20. The yield of -0.1+0.01mm particles in grinding mineral products could be increased by 2.28% used the recommended scheme. Compared with the recommended scheme and the field scheme experienced flotation closed circuit test with one rough and two fine sweeps, the recovery rate of copper concentrate used recommended scheme was 90.11%, which was 1.34% higher than that of the field scheme. And the concentrate grade used recommended scheme was 0.94% higher than that of the field scheme. According to the screening and detection analysis of the flotation tailings, the recovery of copper in -0.1+0.01mm particles of grinding minerals in the recommended scheme was better than that in the field scheme. The recommended medium ratio scheme was used to optimize the particle size composition of grinding minerals, which effectively improved the flotation index of copper in Dongguashan.
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Key words:
- grinding /
- particle size composition /
- flotation
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表 1 矿石多元素分析结果
Table 1. Multi-element analysis results of run-of-mine ore
Element Cu Fe S SiO2 Al2O3 CaO MgO K2O Na2O Content 0.795 21.62 9.89 30.89 3.98 15.90 4.53 0.92 0.24 
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表 2 矿物相分析结果
Table 2. Analysis results of mineral phase
Mineral facies Chal copyrite Pyrite Magnetite Serpentine Talc Uartz Calcium iron garnet Diopside Calcite Muscovite Biotite Plaster Feldspar Pyrrhotite Other minerals Total Content 2.11 4.59 3.40 5.83 2.16 6.58 22.59 12.00 6.73 4.55 3.06 3.83 4.44 3.04 15.09 100.00
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表 3 矿石主要力学性质
Table 3. Mechanical characteristics of rock
Mechanical properties Test weight /(g·m-3) Compressive strength /(kg·cm-2) Platts hardness coefficient(f) Elastic Modulus /(kg·cm-2) Poisson’s ratio(μ) Value 3.45 907.90 9.08 7.55×104 0.29
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表 4 一段球磨初装球比计算表
Table 4. The ball milling ball loading ratio in the first stage
Level /mm Mineral yield /% Yield after deduction -0.10 mm /% Suitable ball diameter for each group /mm Recommended ball ratio /% +0.45 30.93 42.55 60 40 0.45~0.30 8.03 11.05 40 10 0.30~0.15 20.76 28.56 30 30 0.15~0.10 12.98 17.86 25 20 -0.10 27.31 —— —— —— Total 100.00 100.00 —— 100.00
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表 5 浮选产品指标
Table 5. Flotation product index
Test plan Products Yield /% Grade /% Recovery rate/% On-site solution Concentrate 4.99 17.40 88.77 Tailing 95.01 0.116 11.23 Raw ore 100.00 0.98 100.00 Recommended Solution Concentrate 4.88 18.34 90.11 Tailing 95.12 0.103 9.89 Raw ore 100.00 0.99 100.00
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表 6 尾矿铜分布
Table 6. Copper distribution in tailings
Test plan Products Yield /% Grade /% Copper distribution /% Relative raw copper loss rate/% On-site solution Tailings +0.10 mm 17.05 0.219 31.64 3.55 -0.01+0.10 mm 67.50 0.083 47.48 5.33 -0.01 mm 15.45 0.16 20.95 2.35 Total 100.00 0.118 100.00 11.23 Recommended Solution Tailings +0.10 mm 14.92 0.166 24.28 2.40 -0.01+0.10 mm 69.75 0.080 54.71 5.41 -0.01 mm 15.33 0.14 21.04 2.08 Total 100.00 0.102 100.00 9.89
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