Experimental Study on Iron Recovery from Flotation Tailings of Donganshan Iron Ore by Combined Magnetic Separation and Flotation Process
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摘要:
东鞍山烧结厂浮选尾矿TFe品位为22.82%，FeO含量为9.87%，SiO2的含量为51.24%，S和P含量较低，均为0.03%，属于低硫、低磷、高硅型铁尾矿。此外，该尾矿-0.038 mm粒级含量高达56.44%，同时铁矿物主要集中在该粒级中，铁分布率达到67.62%。为了实现该铁尾矿的高效回收利用，本试验采用搅拌磨磨矿—弱磁选—强磁粗选—强磁精选—反浮选流程开展了系统的试验研究。结果表明：在搅拌磨磨矿细度为−0.038 mm占95%、弱磁选磁感应强度95 kA/m、强磁粗选磁场磁感应强度796 kA/m、强磁精选磁场磁感应强度398 kA/m的条件下，可获得TFe品位为38.20%、TFe回收率为63.51%的混合磁选精矿指标；将混合磁选精矿在矿浆温度40 ℃、矿浆pH值为11.5、淀粉用量1000 g/t、CaO用量900 g/t、粗选捕收剂TD-2用量600 g/t、一次精选捕收剂TD-2用量为300 g/t、二次精选捕收剂TD-2用量为300 g/t的条件下进行反浮选，闭路试验可获得TFe品位为62.34%、TFe作业回收率为55.10%的浮选精矿。全流程TFe回收率为35.00%，综合尾矿TFe品位为17.01%。试验结果可为东鞍山浮选尾矿中的铁矿物高效选矿回收提供指导。
Abstract:The flotation tailings of the Donganshan sintering plant contain 22.82% Fe, 9.87% FeO, 51.24% SiO2 and a low S and P content of 0.03%, which belongs to low sulphur, low phosphorus and high silicon type iron tailings. In addition, the tailings contain 56.44% of the −0.038 mm particles. Also, the distribution of iron minerals in this size-level was 67.62%. In order to achieve efficient recovery of iron from this tailings, a systematic experimental study was carried out in this experiment using the process of stirred mill grinding - low intensity magnetic - high magnetic roughing - high magnetic selection - reverse flotation. The results showed that a mixed magnetic separation concentrate with a TFe grade of 38.20% and a TFe recovery of 63.51% was obtained at a fineness of −0.038 mm (95%), a magnetic induction of 95 kA/m for the low magnetic separation, high intensity magnetic field strength of 796 kA/m for roughing magnetic separation and high intensity magnetic field strength of 398 kA/m for cleaning magnetic separation. The appropriate reverse flotation conditions for mixed magnetic concentrates were pulp temperature 40 ℃, pulp pH 11.5, starch dosage of 1000 g/t, CaO dosage of 900 g/t, rougher collector TD-2 dosage of 600 g/t, primary cleaning collector dosage of 300 g/t and secondary cleaning collector dosage of 300 g/t. The flotation concentrate with iron grade of 62.34% and iron recovery of 55.10% was obtained by closed-circuit test. The continuous test for complete flow were carried out, the iron concentrate with iron grade of 62.43% and iron recovery of 35.00% was obtained, and the iron grade of comprehensive tailings was 17.01%. The test results can provide guidance for the high-efficiency beneficiation and recovery of iron minerals in the flotation tailings of Donganshan.
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Key words:
- Donganshan iron tailings /
- magnetic separation /
- flotation /
- stirring mill
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表 1 化学多元素分析结果
Table 1. Results of chemical multi-element analysis of minerals
/% 元素 TFe FeO SiO2 Al2O3 CaO MgO S P 烧失 含量 22.82 9.87 51.24 0.73 1.56 1.74 0.03 0.03 5.88 
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表 2 尾矿粒度分析结果
Table 2. Particle size analysis of tailings
/% 粒级/mm 产率 负累计
产率TFe
品位TFe
分布率负累计
TFe分布率+0.425 0.05 100.00 9.48 0.03 100.00 −0.425+0.150 0.30 99.95 9.68 0.12 99.97 −0.150+0.100 3.96 99.66 10.60 1.83 99.85 −0.100+0.074 9.62 95.69 13.09 5.49 98.02 −0.074+0.043 15.91 86.08 17.19 11.94 92.53 −0.043+0.038 13.73 70.17 21.64 12.97 80.59 −0.038 56.43 56.44 27.45 67.62 67.62 合计 100.00 — 22.91 100.00 —
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表 3 主要磁选设备型号
Table 3. The main magnetic separation equipment
设备名称 设备型号 生产厂家 滚筒磁选机 RK/CRSΦ400×300 武汉洛克制造
有限公司永磁筒式磁选机 GHC-46 北方重工沈矿集团
有限责任公司立式感应湿式强磁选机 LOe-500 沈阳隆基电磁科技
有限公司立式感应湿式强磁选机 LOe-1000 沈阳隆基电磁科技
有限公司
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表 4 闭路浮选试验结果
Table 4. Results of closed-circuit flotation
产品名称 作业产率/% TFe品位/% TFe回收率/% 浮选精矿 33.71 62.43 55.10 浮选尾矿 66.29 25.87 44.90 合计 100.00 38.20 100.00
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表 5 全流程试验结果
Table 5. Results of closed circuit test
产品名称 作业产率/% TFe品位/% TFe回收率/% 精矿 12.79 62.43 35.00 尾矿 87.21 17.01 65.00 合计 100.00 22.82 100.00
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