Research on Process Mineralogy of a High-iron Manganese Ore in Zambia
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摘要:
赞比亚某高铁锰矿中有用矿物为赤铁矿和各种锰矿物，铁品位为44.71%，锰品位为17.86%。为制定合适的选别工艺流程，通过光学显微镜、化学分析、X射线衍射等手段，对该矿石的化学成分、矿物组成及嵌布特征等方面进行的研究。研究结果表明：该矿石中主要的铁矿物为赤铁矿，含量为61.53%；主要的锰矿物为软锰矿、褐锰矿和硬锰矿，含量分别为18.62%，4.82%和4.66%。最后针对该矿石进行了预富集—磁化焙烧—磁选实验，最终获得铁精矿铁品位平均值为67.97%；铁作业回收率平均值为94.67%。锰精矿锰品位平均值为49.85%；锰作业回收率平均值为88.24%。该研究结果对该矿石的分选工艺流程的制定具有一定的指导意义，同时也能为同类矿石提供借鉴。
Abstract:The useful mineral in a high-iron manganese ore in Zambia is hematite and various manganese minerals, and the iron grade is 44.71%, the manganese grade is 17.86%. In order to make an appropriate sorting process, the chemical composition, mineral composition and embedded characteristics of the ore were studied by optical microscope, chemical analysis and X-ray diffraction. The research results show that the main iron mineral is hematite, the content is 61.53%; the main manganese minerals are anthracite, limonite and soft manganese, the content are 18.62%, 4.82% and 4.66%. Finally, pre-concentration-magnetization roasting-magnetic separation test was carried out on the ore, and the average TFe grade was 67.97%, the average recovery rate was 94.67%; the average Mn grade was 49.85%; the average recovery rate was 88.24%. The research results have certain guiding significance for the formulation of the ore sorting process, and also can provide a reference for similar ore.
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表 1 原矿化学多元素分析/%
Table 1. Results of raw material chemical multi-element analysis
TFe FeO Mn Mn2+ SiO2 Al2O3 CaO MgO P S 烧失 44.71 <0.1 17.86 <0.1 5.08 1.98 0.18 0.26 0.022 0.004 2.72 
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表 2 矿石铁化学物相结果分析
Table 2. Iron phase analysis results of the ore
名称 赤铁矿中铁 磁铁矿中铁 硫化铁中铁 碳酸铁中铁 硅酸铁中铁 总铁 含量/% 42.04 0.34 0.22 0.10 0.12 42.82 分布率/% 98.18 0.79 0.51 0.23 0.28 100.00
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表 3 矿石锰化学物相结果分析
Table 3. Manganese phase analysis results of the ore
名称 软锰矿中锰 水、褐锰矿中锰 菱锰矿中锰 总锰 含量/% 13.97 3.40 0.69 18.06 分布率/% 77.35 18.83 3.82 100.00
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表 4 矿石中主要矿物组成及含量
Table 4. Main minerals composition and contents of the ore
名称 赤铁矿 软锰矿 褐锰矿 硬锰矿 水锰矿 石英 黏土矿物 合计 含量/% 61.53 18.62 4.82 4.66 0.85 2.72 6.80 100.00
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表 5 主要矿物工艺粒度统计结果
Table 5. Results of particle size of main mineral processes
粒度/mm 赤铁矿分布率/% 累计含量/% 锰矿物分布率/% 累计含量/% +0.15 93.12 93.12 81.42 81.42 −0.15+0.10 2.74 95.86 7.78 89.20 −0.10+0.075 1.46 97.32 3.62 92.82 −0.075+0.053 0.55 97.87 2.67 95.49 −0.053+0.037 1.33 99.20 3.30 98.79 −0.037 0.80 100.00 1.21 100.00 合计 100.00 100.00 100.00 100.00
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