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包头铁矿的选矿试验证明:利用细粒磁铁矿选择性团聚赤铁矿和借助水玻璃分散硅酸盐类脉石矿物,矿浆经多次脱泥即可获得满意的选铁指标。本文从微观角度分析了单个磁铁矿颗粒的磁场分布规律,指出当磁铁矿颗粒小于10微米时,其磁场梯度有显著提高,产生类似高梯度磁选机中“钢毛”介质所具有的“高梯度效应”,磁铁矿在自身团聚的过程中团聚了周围负电性低的赤铁矿;赤铁矿具有反铁磁结构,是其被微细粒磁铁矿团聚的内因。可以认为:包头铁矿选择性脱泥工艺的实质,是一种利用微细粒磁铁矿对赤铁矿产生磁力团聚的选择性脱泥过程。扫描电镜的图象分析进一步证实了上述论点。
Baotou iron ore beneficiation test proved that: the use of fine-grained magnetite selective agglomeration of hematite and silicate-based dispersion of silicate gangue minerals, slurry after multiple desliming to get a satisfactory selection of iron indicators. This paper analyzes the magnetic field distribution of single magnetite particles from the microscopic point of view, and points out that when the magnetite particles are less than 10 microns, the magnetic field gradient is significantly increased, “High-Gradient Effect,” magnetite reunites around the low-lying hematite in its own reunion process; hematite has an anti-ferromagnetic structure that is the internal cause of agglomeration of the fine-grained magnetite. It can be considered that the essence of the selective desliming process in Baotou Iron Mine is a selective desliming process that utilizes the magnetic agglomeration of the fine-grained magnetite to produce hematite. Scanning electron microscopy image analysis further confirmed the above argument.