Desulfurization Experiment of a High Sulfur Iron Concentrate by Magnetic Separation-Demagnetization-Composite Activation Reverse Flotation
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摘要:
对TFe、S品位分别为55.61%、3.81%，主要硫化矿为磁黄铁矿和黄铁矿的某磁选铁精矿进行了系统的磁选—脱磁—复合活化反浮选脱硫试验研究。试验结果表明，该试样在磨矿细度-0.038 mm占88.32%条件下进行弱磁选，磁选精矿脱磁后，用硫酸调整矿浆pH值至5.5，以H2C2O4+CuSO4+Na2S为复合活化剂，高级黄药（烃基碳原子数为5~7，下同）+丁铵黑药为组合捕收剂，进行了一粗两扫三精反浮选全流程闭路试验，试验取得了铁精矿TFe品位66.71%、TFe回收率81.57%、S含量0.33%，副产品硫精矿S品位29.98%的良好指标。该研究较好地解决了矿山实际生产问题。
Abstract:Systematic magnetic separation-demagnetization-combined activation reverse flotation desulfurization experiments were carried out on a magnetic concentrate with the iron grade of 55.61% and the sulfur grade of 3.81% whose main sulfide ores are pyrrhotite and pyrite. The test results showed that the sample was subjected to a weak magnetic separation test under the condition of grinding fineness -0.038 mm accounting for 88.32%. After demagnetization of the magnetic separation concentrates, the closed-circuit test of the whole process of "one-stage roughing, two -stage scavenging, three-stage cleaning and reverse flotation" was carried out with the pulp pH of 5.5 adjusted by sulfuric acid, compound activator of H2C2O4+CuSO4+Na2S, and combined collector of the advanced xanthate (hydrocarbyl carbon number is 5-7) and the ammonium butyl aerofloat. The test finally obtained the iron concentrate grade of 66.71%, the iron recovery of81.57%, the sulfur content of 0.33%, and the by-product sulfur concentrate sulfur grade of 29.98%. The study better solved the actual production problems of the mine.
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Key words:
- iron concentrate /
- desulfurization /
- flotation /
- demagnetization /
- magnetite /
- pyrrhotite
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表 1 试样化学多元素分析 /%
Table 1. Results of chemical multi-element analysis of the sample
Composition TFe S Zn Cu CaO SiO2 As MgO Other Content 55.61 3.81 0.51 0.02 13.69 19.48 < 0.02 3.32 4.54 
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表 2 试样铁物相分析 /%
Table 2. Results of iron phase analysis of the sample
Occurrence state Iron in magnetite Iron in pyrite Iron in pyrrhotite Iron in hematite Iron in silicate Iron in siderite Total iron Content 45.91 1.81 2.53 1.42 3.67 0.27 55.61 Distribuion ratio 82.56 3.25 4.55 2.55 6.60 0.49 100.00
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表 3 试样粒度组成/%
Table 3. Particle size composition of the sample
Particle-size/mm Yield Grade Distribuion ratio TFe S TFe S +0.106 1.81 36.83 6.94 1.20 3.33 -0.106+0.075 5.49 43.99 6.52 4.35 9.49 -0.075+0.045 24.23 47.82 6.01 20.85 38.63 -0.045+0.038 25.17 54.73 5.67 24.79 37.86 -0.038 43.30 62.64 0.93 48.81 10.68 总计 100.00 55.61 3.81 100.00 100.00
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表 4 先磁后浮与先浮后磁试验结果 /%
Table 4. Test results of magnetic-separation to flotation and flotation to magnetic-separation
Test schemes Iron grade of iron rough concentrate Iron recovery rate of iron rough concentrate Sulfur grade of iron rough concentrate Magnetic-flotation separation 65.22 82.87 0.90 Flotation-magnetic separation 64.97 83.13 1.05
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表 5 活化剂筛选试验结果
Table 5. Test results of activator screening
Activator Iron grade of iron rough concentrate/% Iron recovery rate of iron rough concentrate/% Sulfur grade of iron rough concentrate/% H2C2O4 100 g/t 65.13 83.45 0.94 Na2S 25 g/t 65.46 82.87 0.85 CuSO4 100 g/t 65.50 82.77 0.82 Na2S 25 g/t+CuSO4 100 g/t 65.89 82.51 0.73 H2C2O4 100 g/t+Na2S 25 g/t+CuSO4 100 g/t 66.00 82.22 0.61
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表 6 捕收剂种类对脱硫粗选指标的影响 /%
Table 6. Effect of collector types on iron roughing index
Types of reagent Iron grade of iron rough concentrate Iron recovery rateof iron rough concentrate Sulfur grade of iron rough concentrate Ethyl xanthate 65.88 82.30 0.59 Senior butyl xanthate 66.02 81.97 0.57 Ethyl xanthate+senior butyl xanthate 65.95 82.00 0.58 Ethyl xanthate+ammonium aerofloat 66.10 81.72 0.53 Senior butyl xanthate+ammonium aerofloat 66.17 81.45 0.49
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表 7 全流程闭路试验结果 /%
Table 7. Test results of whole closed-circuit process
Product Yield Grade Rate of recovery TFe S TFe S Iron concentrate 68.00 66.71 0.33 81.57 5.89 Sulfur concentrate 10.85 51.58 29.98 10.06 85.38 Tailings 21.15 21.99 1.57 8.37 8.73 Raw ore 100.00 55.61 3.81 100.00 100.00
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