摘要
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。
Conical flux gathering media with optimal cone angle can effectively aggregate magnetic induction lines so as to increase the magnetic intensity. In the paper, the physical model of closed magnetic system combining magnetic steel with conical flux gathering media was built. In addition, MagNet was applied to simulate the distribution of magnetic moment at conical tip and the distribution of magnetic field at gap （vertical distance from the surface of magnetic steel to the conical tip）. The simulation results showed that the optimal cone angle was 66° at which both magnetic force and magnetic flux intensity at the conical tip had high values. And then, the simulation results were applied to design a magnetic separator prototype for dry high gradient permanent magnetic separation experiment of pulverized coal. While the particle size being 0.125 - 0.25 mm, the desulfurization rate, ash removal rate and yield of cleaned coal were 14.17%, 30.83% and 97.69% respectively. The experiment had remarkable separation results, and the optimization conclusion was credible. The study provided theoretical guidance for designing different magnetic system to meet the efficient magnetic separation of different powder with weak magnetic susceptibility.
出处
《矿山机械》
北大核心
2012年第11期74-79,共6页
Mining & Processing Equipment
基金
教育部高等学校博士学科点专项科研基金(20114116110005)
河南省杰出青年基金(114100510007)
关键词
锥形聚磁介质
锥角
磁力
磁场强度
脱硫
conical flux gathering media
cone angle
magnetic force
intensity of magnetic field
desulfurization
