Experimental study on iron concentrate separation from a low-grade vanadium-titanium magnetite in Panxi area
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摘要: 为了降低磨矿成本，提高铁精矿品位，更好地回收攀西某钒钛磁铁矿中的钛磁铁矿，对TFe品位 23.15%的原矿，利用化学多元素分析、光学显微镜、矿物自动分析仪（MLA）等手段，分析了矿石的矿物组成、主要元素赋存状态、主要矿物的产出形式等，并进行了选铁试验。结果表明：①钛磁铁矿内部普遍含有由固溶体分离作用形成的钛铁矿片晶或尖晶石微粒，包含物粒度通常在0.02 mm以下，难以解离，对铁精矿品位影响较大。②采用磨矿-弱磁-再磨-弱磁-淘洗工艺，可获得铁精矿TFe品位54.64%，铁回收率68.87%的指标。Abstract: In order to reduce the grinding cost and improve the grade of iron concentrate, the mineral composition, occurrence state of main elements and distribution characteristics of main minerals of the ore were studied by means of chemical analysis, optical microscopy, automatic mineral analyzer (MLA) combined with chemical analysis and chemical multielement analysis. The results show that: ① Part of ilmenite and spinel crystals whitch were wrapped in titanium magnetite were fine in size (-0.02 mm) and difficult to be dissociated; ② the iron concentrate with iron grade of 54.64%, iron recovery of 68.87% was obtained by adopting the process of ore grinding, low intensity magnetic separation, regrinding, low intensity magnetic separation, elutriation.
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表 1 矿石化学多元素分析结果
Table 1. Main chemical composition analysis results of the ore
% TFe TiO2 SiO2 Al2O3 CaO MgO 23.15 7.36 29.10 4.66 8.66 14.02 Na2O K2O P As S 烧失 0.24 0.21 0.02 0.0089 0.19 4.56 
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表 2 铁的化学物相分析结果
Table 2. Iron mineral phase analysis results of the ore
% 含铁物相 铁含量 分布率 钛磁铁矿 15.53 67.08 赤（褐）铁矿 1.14 4.92 钛铁矿 2.01 8.68 硫化物 0.15 0.65 硅酸盐 4.32 18.67 合 计 23.15 100.00
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表 3 一段磨矿细度试验结果
Table 3. Results of tests of different grinding fineness
磨矿细度/% 产品名称 产率/% TFe品位/% TFe回收率/% 35 粗精矿 44.86 42.11 81.51 尾矿 55.14 7.77 18.49 给矿 100.00 23.17 100.00 45 粗精矿 41.36 44.35 79.27 尾矿 58.64 8.18 20.73 给矿 100.00 23.14 100.00 55 粗精矿 39.19 46.29 78.36 尾矿 60.81 8.24 21.64 给矿 100.00 23.15 100.00 65 粗精矿 38.88 46.47 78.06 尾矿 61.12 8.31 21.94 给矿 100.00 23.15 100.00
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表 4 一段弱磁磁场强度试验结果
Table 4. Results of tests of different magnetic field intensity
磁场强度/T 产品名称 产率/% TFe品位/% TFe回收率/% 0.15 粗精矿 39.19 46.29 78.36 尾矿 60.81 8.24 21.64 给矿 100.00 23.15 100.00 0.18 粗精矿 39.75 45.87 78.70 尾矿 60.25 8.19 21.30 给矿 100.00 23.17 100.00 0.20 粗精矿 40.54 45.21 79.17 尾矿 59.46 8.11 20.83 给矿 100.00 23.15 100.00 0.30 粗精矿 40.61 45.13 79.23 尾矿 59.39 8.09 20.77 给矿 100.00 23.13 100.00
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表 5 二段弱磁磨矿细度试验结果
Table 5. Results of tests of different regrinding fineness
−0.074 mm占比/% 产品名称 产率/% TFe品位/% TFe回收率/% 70 精矿 81.03 51.67 92.59 尾矿 18.97 17.66 7.41 给矿 100.00 45.22 100.00 80 精矿 77.11 53.42 91.11 尾矿 22.89 17.57 8.89 给矿 100.00 45.21 100.00 90 精矿 76.59 53.64 90.88 尾矿 23.41 17.61 9.12 给矿 100.00 45.21 100.00 95 精矿 75.94 53.83 90.41 尾矿 24.06 18.02 9.59 给矿 100.00 45.21 100.00 95* 精矿 73.65 54.67 89.07 尾矿 26.35 18.76 10.93 给矿 100.00 45.21 100.00 注：*指−0.045 mm占95%。
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表 6 二段弱磁选磁场强度试验结果
Table 6. Results of tests of different magnetic field intensity of two-stage low-intensity magnetic separation
磁场强度/T 产品名称 产率/% TFe品位/% TFe回收率/% 0.06 精矿 75.11 53.92 89.57 尾矿 24.89 18.94 10.43 给矿 100.00 45.21 100.00 0.08 精矿 75.87 53.80 90.28 尾矿 24.13 18.21 9.72 给矿 100.00 45.21 100.00 0.10 精矿 76.26 53.72 90.62 尾矿 23.74 17.86 9.38 给矿 100.00 45.21 100.00 0.12 精矿 76.59 53.64 90.88 尾矿 23.41 17.61 9.12 给矿 100.00 45.21 100.00
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表 7 二段弱磁精淘洗试验结果
Table 7. Results of tests of washing magnetic separator
二段磨矿细度 产品 产率 TFe品位/% TFe回收率/% 作业 对原矿 工艺Ⅰ 铁精矿 87.15 54.81 88.93 63.80 淘洗尾矿 12.85 46.29 11.07 7.94 给矿 100.00 53.72 100.00 71.74 工艺Ⅱ 铁精矿 86.70 55.51 88.04 62.09 淘洗尾矿 13.30 49.16 11.96 8.43 给矿 100.00 54.67 100.00 70.52 注：工艺Ⅰ −0.074 mm占90%；工艺Ⅱ −0.045 mm占95%。
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