Mechanism of high-gradient magnetic separation of complex weakly magnetic minerals enhanced by ferrofluids:transformation of competitive trapping into mechanical entrainment
High-gradient magnetic separation(HGMS) is the most commonly used method to deal with weakly magnetic minerals,but the concentrate grade is limited due to the difficulty of separating weakly magnetic valuable and gangue minerals caused by competing capture. In order to solve these problems,the magnetic repulsion force generated by magnetic fluid was used to eliminate the magnetic force of the weakly magnetic gangue minerals in high-gradient magnetic separation coupling magnetic fluid(HGMSCMF),the competitive capture of weakly magnetic gangue minerals was transformed into mechanical entrainment of nonmagnetic minerals. The results show that compared with conventional high-gradient magnetic separation,TiO2 grade of magnetic products increases from 33.07％ to 44.64％ with MnCl2 solutions of 40％ mass percentage fraction at magnetic induction of 0.5 T,flow velocity of 0.06 m/s and pulsating frequency of 2 r/s. The grade and quality regularity of ilmenite+augite ore samples with high magnetic fluid mass percentage fraction and ilmenite+quartz ore samples in water are the same,indicating the elimination of competitive capture between ilmenite and augite . HGMSCMF solves the problem of low concentrate grade caused by competitive capture in traditional high-gradient magnetic separation,and has broad application prospects.
high gradient magnetic separationmagnetic fluidilmenitecompetitive capture
万方数据
维普
