High Pressure Roller Mill-weak Magnetic Separation Process for Low Grade Iron Ore in Bayan Obo West Mine
-
摘要:
白云鄂博西矿区低品位铁矿石存在入选品位低、选矿利用成本高等问题,为合理利用该铁矿资源,在原矿矿石性质研究的基础上进行了选矿试验研究。结果表明,原矿采用干式磁选预先抛尾—高压辊磨—湿式磁选抛尾—湿式弱磁选工艺处理该矿石,可获得TFe品位66.09%、回收率63.25%、磁性铁回收率94.82%的合格铁精矿。试验结果为该低品位铁矿的高效开发利用提供参考依据。
Abstract:There are a series of problems such as low grade and high cost of ore dressing and utilization of the raw ores in Bayan Obo West Mine. For the rational utilization of this iron ore resources, the ore dressing process was carried out on the basis of ore properties. The results show that the ore is treated with the raw ore dry magnetic pre-discarding tailings-high pressure roller mill-wet magnetic discarding tailings-wet weak magnetic separation process, and the qualified iron concentrate with the iron grade of 66.00% or more is obtained. The test results provide reference of the low grade iron ore efficient use.
-
Key words:
- Baiyun Obo /
- low grade iron ore /
- high pressure roller mill /
- magnetic separation
-
-
表 1 原矿化学多元素分析 /%
Table 1. Chemistry multi-element analysis of ore
成分 TFe FeO CaO MgO SiO2 Al2O3 S P F Ce La Nd 含量 16.96 10.70 22.96 8.86 6.26 0.61 1.63 0.28 1.62 0.26 0.16 0.10 表 2 铁元素化学物相分析4 /%
Table 2. Iron element chemical phase analysis
物相种类 磁铁矿中铁 赤褐铁矿中铁 黄铁矿中铁 硅酸盐中铁 总计 含量 10.80 3.26 1.22 1.68 16.96 分布率 63.68 19.22 7.19 9.91 100.00 表 3 磁铁矿的嵌布粒度(点测法)
Table 3. Grain size of magnetite embedded (point test method)
粒级/mm 分布率/% 累计含量/% -0.50+0.30 17.64 17.64 -0.30+0.17 19.05 36.68 -0.17+0.14 8.15 44.84 -0.14+0.105 16.59 61.43 -0.105+0.074 18.69 80.12 -0.074 19.88 100.00 表 4 原矿干式磁选预先抛尾试验结果 /%
Table 4. Results of raw ore dry magnetic pre-primary tailing test
产品名称 产率 品位 作业回收率 TFe MFe TFe MFe 粗精矿 85.10 18.23 12.47 91.47 98.26 尾矿 14.90 9.71 1.26 8.53 1.74 原矿 100.00 16.96 10.80 100.00 100.00 表 5 高压辊磨试验结果
Table 5. Results of high pressure roller mill test
辊压次数 1 2 3 4 5 筛上量 N/kg 50.51 69.50 77.91 78.20 77.81 筛下量 M/kg 49.49 81.01 91.60 99.71 100.40 -3 mm 产率/% 49.50 53.82 54.04 56.04 56.34 表 6 物料入压前后的粒度分析结果
Table 6. Results of grain size analysis before and after materials pressured
粒级/mm 产率/% 累积产率/% 入压前 -25+15 56.21 56.21 -15+5 26.64 82.85 -5+1 9.81 92.66 -1+0.074 5.24 97.90 -0.074 2.10 100.00 入压后 -3+1 41.94 41.94 -1+0.5 16.10 58.04 -0.5+0.074 16.58 74.62 -0.074 25.38 100.00 表 7 全流程试验结果
Table 7. Results of the whole process test
产品名称 产率/% 品位/% 回收率/% TFe MFe TFe MFe 精矿 16.23 66.09 63.10 63.25 94.82 尾矿 83.77 7.44 0.67 36.75 5.18 原矿 100.00 16.96 10.80 100.00 100.00 -
[1] 郭小飞.高压辊磨机选型试验的研究现状[J].金属矿山, 2017(6):71-74. http://d.old.wanfangdata.com.cn/Periodical/jsks201706014
[2] 程仁举, 李成秀.印尼低品位铁矿选矿试验研究[J].矿产综合利用, 2013(2):24-27. doi: 10.3969/j.issn.1000-6532.2013.02.007
[3] 常前发, 王运敏.冶金矿山节能减排的技术现状与对策措施[J].矿产保护与利用, 2013(5):13-19. http://kcbh.cbpt.cnki.net/WKD/WebPublication/paperDigest.aspx?paperID=30fd01c8-6452-44a0-97c2-8f1ebed7bb54
[4] 刘全民, 张洪国, 等.有色金属矿山节约资源能源与减排[J].矿产保护与利用, 2009(1):38-42. doi: 10.3969/j.issn.1001-0076.2009.01.008 http://kcbh.cbpt.cnki.net/WKD/WebPublication/paperDigest.aspx?paperID=0099151f-69a1-4e5a-ad80-24227203582a
[5] 任从坡, 林建厂, 等.大型铁矿高压辊磨和常规破碎方案比较[J].矿业工程, 2017, 15(5):38-42.
[6] 何名飞.高压辊磨机降低选厂能耗研究[J].云南冶金, 2017, 46(1):14-18. doi: 10.3969/j.issn.1006-0308.2017.01.003
[7] 亚海斌, 侯英, 徐海阳.金鑫钼矿石高压辊磨破碎产品的特性研究[J].金属矿山, 2017(9):126-129. doi: 10.3969/j.issn.1001-1250.2017.09.026
[8] 刘磊. 贫赤铁矿石高压辊磨机粉碎-高效分选技术研究[D]. 沈阳: 东北大学, 2012.
[9] 饶强坚.安徽某低品位铜矿石选矿试验[J].现代矿业, 2016(9):90-93. doi: 10.3969/j.issn.1674-6082.2016.09.025
-