弓长岭某磁铁矿高效制备超级铁精矿试验研究

超级铁精矿作为一种高附加值的新型材料，具有巨大的发展潜力。弓长岭某磁铁矿TFe品位45.62%，SiO2是其主要的脉石成分，含量为33.21%，有害元素P、S含量较低。原矿中的铁主要赋存在磁铁矿中，占全铁的95.05%。矿石中磁铁矿粒度较粗，主要分布在+74μm，分布率为82.37%。试样中磁铁矿主要以单体形式产出，部分微细粒石英以包裹、反包裹和细脉状嵌布于磁铁矿中，较难完全解离。为实现该矿石的高值化利用，开展了超级铁精矿制备工艺试验研究。试验结果表明，采用阶段磨矿—阶段磁选—反浮选工艺处理该磁铁矿石，在一段试样磨至-0.074mm含量为65%，二段试样磨至-0.025mm含量为90%，反浮选工艺中粗选和精选的捕收剂用量均为25g/t的工艺参数下，可以获得TFe品位72.35%、回收率为81.02%、SiO2含量为0.17%、酸不溶物为0.19%，其它杂质含量微量的高品质超级铁精矿，以及TFe品位71.37%、回收率为6.07%的高纯铁精矿和TFe品位60.26%、回收率为6.71%的普通铁精矿，为磁铁矿的高附加值和梯级化利用提供了技术依据。

Experimental Study on Efficient Preparation of Super Iron Concentrate from a Magnetite Mine in Gongchangling

Super iron concentrate, as a new type of high value-added material, has enormous development potential. The TFe grade of magnetite in Gongchangling is 60.96%. The main impurity SiO2 in the ore are 33.21%, and the content of harmful elements P and S is relatively low. The iron element mainly exists in magnetite, accounting for 95.05%.The particle size of magnetite in the ore is coarse, mainly distributed in +74μm, and the distribution rate is 82.37%. Magnetite in the sample is mainly produced in the form of monomer. Some fine-grained quartz is embedded in magnetite in the form of inclusions, reverse inclusions and fine veins, which is difficult to be completely dissociated. In order to realize the high value utilization of the ore, the experimental study on the preparation of super iron concentrate was carried out. The process flow of “stage grinding-stage magnetic separation-reverse flotation to desiliconization” was displayed. Under the process parameters of the first-stage grinding fineness of ?0.074 mm content of 65 %, the second-stage grinding fineness of ?0.025 mm content of 90 %, and the amount of roughing and cleaning collectors in reverse flotation of 25g/t. The results showed that the high-quality super iron concentrate with a TFe grade of 72.35%, recovery rate of 81.02%, SiO2 content of 0.17%, and acid insoluble substance of 0.19% and trace other impurities was obtained. High purity iron concentrate with TFe grade of 71.37% and recovery of 6.07% ,as well as ordinary iron concentrate with TFe grade of 60.26 % and recovery of 6.71 % were also obtained. This technology provides a basis for the high value and grading utilization of magnetite.