Experimental Study on Recovery of Super Pure Iron Concentrate from an Iron Concentrate in Sichuan
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摘要:
四川某铁精矿中TFe品位为64.56%，杂质成分SiO2、Al2O3含量分别为5.50%和2.01%。物质组分研究表明，铁矿物主要以磁性铁形式存在，采用“阶段磨矿（再磨过程添加分散剂H01）-阶段磁选”工艺对该铁精矿进行提质降杂实验，实验可获得TFe品位为72.11%的超纯铁精矿产品，精矿中杂质成分SiO2含量为0.20%，Al2O3的含量为0.16%，酸不溶物的含量为0.28%，TFe的回收率为92.72%。
Abstract:The iron grade of a iron concentrate in Sichuan is 64.56%, and the content of SiO2 and Al2O3 is 5.50% and 2.01% respectively. Material composition research shows that iron minerals are mainly in the form of magnetic iron. The process of stage grinding and magnetic separation which added dispersant H01 in regrinding is carried out to increase iron grade and reduce silicon content. Finally, the super iron concentrate with iron grade 72.11%, SiO2 content 0.20%, Al2O3 content 0.16%, acid insoluble content 0.28%, and the iron recovery is 92.72%.
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Key words:
- Iron concentrate /
- Stage grinding /
- Dispersant /
- Stage magnetic separation /
- Super pure iron concentrate
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表 1 化学多元素分析结果/%
Table 1. Analysis results of chemistry multi-elements of the sample
TFe SiO2 Al2O3 K2O Na2O CaO MgO TS P TiO2 64.56 5.50 2.01 0.21 0.17 0.68 0.25 0.31 0.068 0.146 
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表 2 铁的物相分析结果
Table 2. Analysis results of iron phase of the sample
铁相态 含量/% 分布率/% 磁铁矿·磁黄铁矿 63.16 97.83 菱铁矿 0.15 0.23 氧化铁 0.35 0.54 硫化铁 0.90 1.40 全铁 64.56 100.00
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表 3 -2 mm试样粒度组成及分析结果
Table 3. Result of the -2 mm particle size distribution of sample
粒级/mm 产率/% TFe品位/% TFe分布率/% +0.45 1.11 23.58 0.41 -0.45+0.25 6.39 50.41 4.99 -0.25+0.15 16.50 61.46 15.71 -0.15+0.074 30.76 64.77 30.86 -0.074+0.045 20.42 67.86 21.46 -0.045+0.038 3.35 68.84 3.57 -0.038 21.47 69.16 23.00 试样 100.00 64.56 100.00
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表 4 粗选精矿粒度组成及分析结果
Table 4. Result of distribution of rough concentrate
粒级/mm 产率/% TFe品位/% TFe分布率/% -0.45+0.25 1.19 60.28 1.02 -0.25+0.15 6.82 67.34 6.50 -0.15+0.074 19.22 69.89 19.01 -0.074+0.045 32.36 71.19 32.61 -0.045+0.038 7.37 71.36 7.44 -0.038 33.04 71.45 33.42 合计 100.00 70.65 100.00
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表 5 磁选全流程实验结果
Table 5. Magnetic experiment results of total procedure
产品名称 产率/% TFe品位/% TFe回收率/% 精矿1 81.57 72.14 90.98 精矿2 1.59 70.57 1.74 总铁精矿 83.16 72.11 92.72 次铁精矿（中矿1） 2.71 63.11 2.64 尾矿 9.87 13.43 2.05 中矿2 4.26 39.34 2.59 总尾矿 14.13 21.24 4.64 原 矿 100.00 64.68 100.00
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表 6 总铁精矿化学多项分析结果/%
Table 6. Chemical composition of final iron concentrate ore
TFe SiO2 Al2O3 S Cu Zn 72.11 0.20 0.16 0.18 0.0016 0.0070 Ag Pb As P 酸不溶物 0.0064 0.0016 <0.005 <0.005 0.28
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表 7 总铁精矿粒度组成分析结果
Table 7. Particle size distribution of final iron concentrate ore
粒级/mm 产率/% TFe
品位/%TFe
分布率/%+0.15 0.51 70.39 0.50 -0.15+0.074 23.26 71.49 23.06 -0.074+0.045 38.29 72.30 38.40 -0.045+0.038 2.24 72.29 2.24 -0.038 35.70 72.31 35.80 合计 100.00 72.11 100.00
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