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锥形聚磁介质满足最佳锥角可有效聚集磁力线,提高磁场强度。构建永磁钢-锥形聚磁介质闭合磁系物理模型,通过MagNet磁场仿真软件模拟锥形聚磁介质在不同锥角下锥尖磁矩及极隙(磁钢表面到锥尖垂直距离)磁场分布情况,分析得出:锥角为66°所对应的锥尖磁力及磁感应强度值较高,为最佳锥角。利用仿真结果设计磁选样机进行煤粉干法永磁高梯度磁选试验,粒度级为0.125～0.25mm时,脱硫率、脱灰率、精煤产率分别达14.17%、30.83%、97.69%,分选效果明显,优化结论可信。该研究对于设计不同磁系满足不同弱磁性粉体高效磁选提供理论指导。
Tapered polycrystalline magnetic media to meet the best cone angle can effectively gather magnetic lines of force to improve the magnetic field strength. The closed magnetic system model of permanent magnet steel-pyramidal polycrystalline magnetic medium was constructed. The magnetic moment of cone-shaped magnetic collector under different cone angles and magnetic field of pole gap (vertical distance from magnet surface to cone tip) were simulated by MagNet magnetic field simulation software. Distribution, analysis: the cone angle of 66 ° corresponding to the tip of the magnetic tip and the magnetic flux density higher value for the best cone angle. When the particle size is 0.125 ~ 0.25mm, the desulfurization rate, the ash removal rate and the clean coal yield are respectively 14.17%, 30.83% and 97.69% , The sorting effect is obvious, the optimization conclusion is credible. The study provides theoretical guidance for designing different magnetic systems to meet different weak magnetic powder efficient magnetic separation.