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为提高硼镁石浮选回收率,使用六偏磷酸钠减小蛇纹石对浮选的不利影响。通过浮选试验、zeta电位测试、傅里叶红外光谱分析、XPS分析及DLVO理论等手段,研究蛇纹石粒度、含量以及六偏磷酸钠(SHMP)对硼镁石浮选的影响,并对矿物颗粒间的相互作用以及六偏磷酸钠的作用机理进行分析。结果表明,蛇纹石与硼镁石颗粒间易发生团聚作用,且蛇纹石粒度对硼镁石浮选结果影响十分显著。与粗粒级蛇纹石相比,粒径小于38μm的蛇纹石能显著降低硼镁石的回收率。加入SHMP后,蛇纹石对硼镁石浮选的不利影响得到明显减弱。机理研究表明,SHMP能影响蛇纹石与硼镁石矿物表面电荷,从而阻碍颗粒间团聚的发生,使矿物颗粒在矿浆中呈良好的分散状态,有利于硼镁石的浮选。此外,SHMP通过氢键与化学吸附作用于蛇纹石表面,并生成一种络合物使蛇纹石的可浮性降低。
In order to increase the recovery rate of magnesia flotation, the use of sodium hexametaphosphate reduces the adverse effect of serpentine on flotation. The effects of serpentine size, content and sodium hexametaphosphate (SHMP) on the flotation of borophosphite were studied by means of flotation test, zeta potential test, Fourier transform infrared spectroscopy, XPS analysis and DLVO theory. Mineral particle interactions and the mechanism of action of sodium hexametaphosphate were analyzed. The results show that the serpentine and boehmite particles tend to agglomerate easily, and the serpentine size has a significant effect on the flotation results of boehmite. Compared with coarse-grained serpentine, serpentine with a particle size of less than 38 μm can significantly reduce the recovery rate of borophite. After the addition of SHMP, the adverse effect of serpentine on the flotation of boehmite has been significantly reduced. Mechanism studies show that SHMP can affect the surface charge of serpentine and boehmite minerals, thus hinder the occurrence of intergranular agglomeration, make the mineral particles in the slurry have a good dispersion state, which is conducive to the flotation of boehmite. In addition, SHMP acts on the serpentine surface via hydrogen bonding and chemisorption and generates a complex that reduces the floatability of the serpentine.