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摘要:
攀枝花某铁矿原矿石中有用矿物为磁铁矿，其磁性铁分布率为79.53%，有少量的赤铁矿、褐铁矿，钒钛含量极低无法进行物理选别，脉石矿物主要为云母、长石等硅酸盐矿物，矿石中的有用矿物因嵌布粒度细导致极难回收利用。为了高效开发利用该类矿石资源，经磨矿、磁选条件实验及重选探索实验，确定了单作业较佳工艺参数，经工艺流程实验，确定采用阶段磨矿、阶段选别、单一磁选工艺处理该矿石。工艺流程实验结果表明，在原矿石中铁品位36.78%，经三次磨矿、五次磁选，在-43 μm含量98%的最终磨矿粒度条件下，最终获得铁精矿品位为65.50%，产率41.77%，金属回收率为74.39%的铁精矿，为有效利用细粒嵌布类型攀枝花铁矿提供了新的参考工艺。
Abstract:Valuable minerals in the raw iron ore in Panzhihua is magnetite, in which the ratio of magnetic iron ore is 79.53%, followed by hematite and limonite, with extreme low content of vanadium and titanium that unable to concentrate, the gangue minerals are silicate minerals such as mica, feldspar, etc. Due to its fine-disseminated particle size, the raw iron ore is difficult to recycle. In order to develop and utilize this kind of ore resources efficiently, a combined flow sheet of stage grinding-stage separation-certain magnetic separation is finally determined to treat this ore after several grinding and magnetic separation condition tests and gravity election investigated test. The beneficiation process results show that the final concentrate with iron grade of 65.50%, yield of 41.77% and metal recovery of 74.39% can be obtained when the iron grade of raw ore is 36.78% and the content of -43 μm is 98% of the final grinding particle size. It provides a new reference process for the Panzhihua fine disseminated iron ore.
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Key words:
- Magnetite /
- Fine-disseminated /
- Stage grinding /
- Certain magnetic separation
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表 1 矿样铁物相分析结果
Table 1. Iron phase analysis of the sample
名称 总铁 磁铁矿 碳酸铁 硅酸铁 假象、半假赤铁矿 赤褐铁矿 含量/% 36.78 29.25 0.91 1.52 1.08 4.03 分布率/% 100.00 79.53 2.45 4.08 2.99 10.96 
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表 2 矿样主要化学成分分析结果/%
Table 2. Chemical composition analysis results of the sample
TFe FeO TiO2 V2O5 SiO2 Al2O3 CaO MgO MnO K2O Na2O S P 烧失 36.78 19.04 0.042 0.014 31.2 5.47 2.26 1.91 0.064 0.21 0.13 <0.010 0.065 2.72
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表 3 一段弱磁尾矿铁物相分析结果
Table 3. Iron phase analysis of primary magnetic tailings
名称 总铁 磁铁矿 碳酸铁 硅酸铁 假象、半假赤铁矿 赤褐铁矿 含量/% 12.36 0.62 1.33 2.97 0.46 6.98 分布率/% 100.00 5.02 10.76 24.03 3.72 56.47
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表 4 三段弱磁选精矿高频振网筛选选别实验结果
Table 4. Test result of high frequency vibrating screen of the concentrate sample
给矿品位/% 筛上 筛下 铁品位/% 产率/% 铁品位/% 产率/% 62.15 59.86 34.38 63.35 65.62
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表 5 全流程闭路实验采用实验设备情况
Table 5. Equipment usage profile of total process
工艺流程 设备名称 一段磨矿 Ф900×1800 mm溢流型球磨机 二段磨矿 Ф900×1800 mm溢流型球磨机 三段磨矿 JM-600立式磨机 一次分级 Ф500×5500 mm螺旋分级机 二次分级 Ф75 mm旋流器 三次分级 Ф75 mm旋流器 一段磁选 永磁筒式磁选机156 mT(Φ400×600 mm) 二段磁选 永磁筒式磁选机146 mT(Φ400×600 mm) 过滤 BY60圆盘真空过滤机
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