Super-Grade Iron Concentrate Experimental Study on an Iron Concentrate from Sichuan
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摘要:
对四川某铁矿铁精矿进行超级铁精矿选别实验研究，原料中TFe品位65.50%，主要的脉石成分为SiO2，品位为4.82%，有害元素S、P含量较低，磁性铁占有率98.74%，其他物相的铁元素含量很低，且基本不具有磁性，通过继续磨矿-磁选，可提升磁性铁占有率，进而提升铁精矿纯度。实验采用“预先筛分-磨矿分级-磁选-反浮选”的选别工艺制备超级铁精矿，在筛分尺寸0.074 mm，以纳米陶瓷球为磨矿介质，磨矿粒度−0.038 mm 90%，反浮选阳离子捕收剂分段添加量(100+50+50) g/t，玉米淀粉600 g/t的条件下可获得产率24.23%，可获得铁品位71.71%，SiO2含量0.16%，酸不溶物0.16%的超级铁精矿。该工艺磨矿能耗低，药剂制度简单，药剂绿色高效，流程合理，可行性高，同时全流程实验生产的副产品铁精矿产率72.25%，品位65.47%，可作为优质铁精矿销售。
Abstract:In terms of the iron concentrate, the TFe grade is 65.50% and mainly gangue is quartz with the content of 4.82%. Additionally, the content of harmful impurity, sulphur and phosphor, is low. Following grinding-magnetic separationis able to enhance the mFe content and grade of concentrate for the reason that the content of mFe is 98.74% and other iron phase is nonmagnetic. The process of prescreening-grinding-classification-magnetic separation-reverse flotation is adopted to the super-grade iron concentrate experimental study of an iron concentrate from Sichuan. When the screen size is 0.074 mm and grinding fitness is -0.038 mm 90%, using the thenanoceramic balls as milling medium, super-grade iron concentrate with yield 24.23%, TFe grade 71.71%, quartz content of 0.16%, acid insoluble content of 0.16% could be obtained. In the process, the usage of corn starch is 600 g/t and the usage of collector is 100+50+50 g/t. The process is reasonable and significantly feasibility with low energy consumption and simple reagent system. Additionally, the process could obtain normal iron concentrate with the yield of 72.25% and TFe grade of 65.47% which could be considered as good iron concentrate product to sell.
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Key words:
- Super-grade iron concentrate /
- Pre-screen /
- Magnetic separation /
- Reverse flotation
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表 1 原矿多元素分析结果/%
Table 1. Multi-element analysis results of run-of-mine ore
TFe P S SiO2 Al2O3 65.50 0.10 0.03 4.82 0.45 
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表 2 铁物相分析结果/%
Table 2. Analysis results of iron phase
名称 磁性铁 赤、褐铁矿 硅酸铁 碳酸铁 硫化铁 合计 含量/% 64.43 0.35 0.36 0.05 0.06 65.25 占有率/% 98.74 0.54 0.55 0.08 0.09 100.00
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表 3 原料粒度组成分析结果
Table 3. Analysis of grain size composition of feeder
粒级/mm 产率/% TFe品位/% 金属分布率/% +0.074 36.72 62.32 34.93 −0.074+0.043 24.86 64.68 24.55 −0.043+0.038 9.96 68.12 10.36 −0.038 28.46 69.41 30.16 原料 100.00 65.50 100.00
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表 4 “磨矿-磁选”实验结果/%
Table 4. Test result of “grinding-magnetic separation”
磨矿细度 名称 产率/% 品位/% 回收率/% −0.043 mm 90% 精矿 96.43 68.84 98.58 尾矿1 2.62 20.65 0.80 尾矿2 0.95 44.24 0.62 给矿 100.00 67.34 100.00 −0.038 mm 90% 精矿 92.32 70.36 96.34 尾矿1 5.56 23.43 1.93 尾矿2 2.12 55.03 1.73 给矿 100.00 67.43 100.00 −0.0308 mm 80% 精矿 90.01 71.02 94.81 尾矿1 7.32 25.72 2.79 尾矿2 2.67 60.65 2.40 给矿 100.00 67.43 100.00 −0.0308 mm 95% 精矿 88.63 71.09 93.51 尾矿1 8.11 29.42 3.54 尾矿2 3.26 61.03 2.95 给矿 100.00 67.38 100.00
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表 5 反浮选开路实验实验结果
Table 5. Result of reverse flotation open-circuit test
产品名称 产率/% 品位/% 回收率/% 铁精矿 41.48 71.71 42.31 中2 14.40 70.08 14.35 中1 16.34 69.95 16.25 尾矿 27.78 68.58 27.09 原矿 100.00 70.32 100.00
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表 6 超级铁精矿多元素分析结果/%
Table 6. Chemical analysis results of super-grade iron concentrate
Fe SiO2 Al2O3 CaO MgO K2O Na2O 71.71 0.16 0.15 0.036 0.057 0.002 0.001 S P MnO ZnO TiO2 Cr2O3 酸不溶物 0.012 0.003 0.09 0.02 0.008 0.019 0.16
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