Process Mineralogy and Beneficiation Test of a Large Scale Crystalline Graphite Ore in Tanzania
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摘要:
以坦桑尼亚某地大鳞片晶质石墨矿为研究对象，对其进行了工艺矿物学和浮选实验研究。结果表明，该矿石中有用矿物为鳞片状石墨，固定碳含量为5.67%；原矿在磨矿细度-0.15 mm 47%，煤油用量90 g/t，2#油用量60 g/t，粗选时间为2.5 min的粗选条件下，采用“一粗一精一扫的浮选流程获得的粗精矿，再经六次剥片磨矿、七次精选，中矿分批集中返回”的工艺流程，获得固定碳含量为95.06%，回收率为90.16%，+0.15 mm产品占精矿72.47%的产品，该工艺可以有效保护大鳞片石墨。
Abstract:The process mineralogy and flotation tests of a large scale crystalline graphite ore in Tanzania were carried out. The results show that the useful mineral in the ore is flake graphite with a fixed carbon content of 5.67%. At the conditions of grinding fineness of -0.15 mm, content of 47%, kerosene dosage of 90 g/t, 2# oil dosage of 60 g/t and roughing time of 2.5 min, the roughing concentrate was obtained by the flotation process of "one roughing, one cleaning and one scavenging" was processed by six times of strip grinding, seven times of cleaning, and middling returned in batches. The fixed carbon content was 95.06% and the recovery was 90.16%, +0.15 mm products accounting for 72.47% of the concentrate. This process can effectively protect large flake graphite.
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Key words:
- Tanzania /
- Large scale crystalline /
- Graphite ores /
- Process mineralogy /
- Flotation
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表 1 矿石主要化学成分分析结果/%
Table 1. Results of main chemical composition analysis of the ore
固定碳 灰分 挥发分 V2O5 S P K2O 水分 Na2O Al2O3 SiO2 CaO FeO MgO TiO2 5.67 88.12 6.21 0.15 1.91 0.002 2.34 0.55 2.47 10.12 62.32 2.50 2.98 2.31 0.88 
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表 2 矿石主要矿物组成及含量
Table 2. Main mineral composition and content of the ore
矿物名称 石墨 黄铁矿 磁铁矿 磁黄铁矿 石英 角闪石 含量/% 6.0 2.5 0.3 0.2 61.0 9.0 矿物名称 黑云母 白云母 长石 白云石 蚀变矿物 含量/% 6.0 4.0 4.0 2.0 5.0
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表 3 石墨分级统计结果
Table 3. Statistical results of graphite classification
粒级/μm +490 -490+287 -287+175 -175+150 -150+100 -100+75 -75+40 占有率/% 5.2 70.7 14.9 4.4 2.3 2.1 0.4
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表 4 原矿粒度筛析分析
Table 4. Analysis of particle size of the raw ore
粒度/mm 产率/% 累计产率/% 固定碳含量/% 固定碳分布率/% +0.490 46.93 46.93 4.94 41.61 -0.490+0.287 12.74 59.67 9.55 21.84 -0.287+0.175 13.47 73.14 8.80 21.28 -0.175+0.150 4.74 77.88 6.18 5.26 -0.150+0.100 6.87 84.75 3.87 4.77 -0.100 15.25 100.00 1.91 5.24 合计 100.00 — 5.57 100.00
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表 5 粗精矿制样实验结果
Table 5. Sample preparation test results of the coarse concentrate
产品名称 产率/% 固定碳含量/% 固定碳回收率/% 粗精矿 8.55 58.86 89.29 中矿 1.70 1.72 0.52 尾矿 89.75 0.64 10.19 合计 100.00 5.64 100.00
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表 6 粗精矿再磨精选实验结果
Table 6. Results of regrinding and cleaning test of the coarse concentrate
粗精矿再磨精选次数 产品名称 产率/% 固定碳含量/% 固定碳回收率/% 1次剥片磨矿、1次精选 精矿 6.73 74.21 88.58 2次剥片磨矿、2次精选 精矿 5.94 84.20 87.70 3次剥片磨矿、3次精选 精矿 5.63 87.5 87.35 4次剥片磨矿、4次精选 精矿 5.44 90.41 86.93 4次剥片磨矿、5次精选 精矿 5.31 90.68 85.16 5次剥片磨矿、5次精选 精矿 5.26 92.98 86.17 5次剥片磨矿、6次精选 精矿 5.13 93.37 85.04 6次剥片磨矿、6次精选 精矿 5.14 94.07 85.09 6次剥片磨矿、7次精选 精矿 5.05 95.15 84.53
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表 7 开路流程实验结果
Table 7. Results of open-circuit process tests
产品名称 产率/% 固定碳含量/% 固定碳回收率/% 精矿 5.05 95.15 84.53 中矿1 0.11 68.92 1.33 中矿2 0.10 57.23 1.01 中矿3 0.15 27.84 0.73 中矿4 0.21 12.00 0.44 中矿5 0.27 4.07 0.19 中矿6 0.84 3.81 0.56 中矿7 1.84 1.52 0.49 中矿8 1.71 3.33 1.00 中矿9 1.66 7.76 2.28 尾矿 88.06 0.48 7.44 合计 100.00 5.68 100.00
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表 8 闭路实验结果
Table 8. Results of closed-circuit tests
产品名称 产率/% 固定碳含量/% 固定碳回收率/% 精矿 5.38 95.06 90.16 尾矿 94.62 0.59 9.84 合计 100.00 5.67 100.00
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表 9 精矿筛析分析结果
Table 9. Results of concentrate sieve analysis
粒度/mm 产率/% 累计产率/% 固定碳含量/% 固定碳回收率/% +0.490 1.94 1.94 94.16 1.92 -0.490+0.287 20.37 22.31 96.49 20.67 -0.287+0.175 38.95 61.26 95.44 39.10 -0.175+0.150 11.21 72.47 95.01 11.20 -0.150+0.100 13.52 85.99 94.46 13.44 -0.100 14.01 100.00 92.74 13.67 合计 100.00 — 95.06 100.00
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