Research on Technology Optimization of Fine Grinding and Magnetic Separation for a Fine-grained Iron Ore in Qinhuangdao
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摘要:
采用立式搅拌磨机作为微细粒级矿物的再磨设备,以秦皇岛地区微细粒级铁矿为试验样品,进行了磨矿及磁选条件试验研究,结果表明,磨矿产品粒度达到-0.038mm占95.43%,经一次粗选和两次精选可以获得产率66.12%、磁性铁品位为64.06%、回收率为97.16%,全铁品位为65.94%的优质铁精粉。磨机磨矿电耗测试表明,当磨矿产品粒度达-0.038mm约占95.00%时,磨矿电耗为15.20kW·h/t。该试验表明,秦皇岛地区的铁矿可以通过细磨解离获得好的选矿指标,立式搅拌磨机是一种高效的细磨设备。
Abstract:A vertical stirring mill is used as the regrinding equipment for fine-grained minerals.The fine-grained iron ore in the Qinhuangdao area is used as the test sample to conduct a test study on grinding and magnetic separation conditions.The results show that the particle size of the ground product reaches -0.038 mm It accounts for 95.43%.Highquality iron powder with a yield of 66.12%, a magnetic iron grade of 64.06%, a recovery rate of 97.16%, and a total iron grade of 65.94% can be obtained after one rough selection and two selections.The grinding power consumption test of the mill shows that when the particle size of the grinding product reaches -0.038 mm, which accounts for about 95.00%, the grinding power consumption is 15.20 kW·h/t.The test shows that the iron ore in the Qinhuangdao area can obtain good beneficiation indexes through fine grinding and dissociation.The vertical mixing mill is an efficient fine grinding equipment.
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Key words:
- fine-grained iron ore /
- fine grinding /
- vertical stirring mill /
- magnetic separation
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表 1 给料中不同铁物相含量
Table 1. Phase analysis results of feed ore
/% 铁相 磁铁矿中铁 碳酸铁中铁 赤褐铁矿中铁 硫化铁中铁 硅酸铁中铁 假象赤铁矿中铁 总铁 含量 43.58 0.32 0.39 0.07 0.33 1.17 45.86 分布率 95.03 0.70 0.85 0.15 0.72 2.55 100.00 表 2 给料中主要化学成分的含量
Table 2. Results of chemical analysis of feed ore
/% 成分 mFe TFe SiO2 P S 含量 43.58 45.86 30.43 0.021 0.086 表 3 给料粒度分析结果
Table 3. The particle size analysis results of feed ore
粒级范围/mm 产率/% mFe/% SiO2/% +0.15 7.17 24.89 46.77 -0.15+0.075 15.09 29.99 44.37 -0.075+0.045 18.19 37.88 40.09 -0.045+0.038 10.73 41.22 35.68 -0.038 48.82 53.18 17.46 合计 100.00 43.58 30.43 表 4 试验中所用的主要设备
Table 4. Main equipments and instruments used in the tests
名称 规格型号 生产厂家 备注 立式螺旋搅拌磨机 JM-180/0.75kW 长沙矿冶研究院 带扭矩测试仪测定电耗 立式螺旋搅拌磨机 JM-260/5.5kW 长沙矿冶研究院 辊筒式电磁磁选机 DCФ400x300-0.18T 长沙矿冶研究院 真空过滤机 XTLZ-Φ260/Φ200 武汉探矿 数显鼓风干燥箱 GZX-9240MBE 上海一恒 标准筛 Φ200×50 中国航空工业第540厂 -
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