基于Halbach永磁阵列的新型磁选机磁系设计及应用

常规贫磁铁矿石干式预选抛尾工艺的主要设备磁滑轮和上吸式干选机的磁系产生的都是双面磁场，而真正作用于选分空间的只是双面磁场的一部分即只有其中一面磁场作用于选分空间，因此磁能利用率较低。提出了基于Halbach永磁阵列的新型磁系，即非对称结构的磁场分布，将绝大部分磁场能汇聚在磁体阵列作用于分选作业的一侧，并且采用该新型磁系对磁滑轮和上吸式干选机进行了优化。优化后的新型磁系具有单边增强性、较高的气隙磁密和较大的磁场利用率等优点。以磁系优化后的磁选机对辽宁某磁铁矿石进行抛尾试验，获得了抛尾产率为26.92%、磁性铁回收率为2.62%的指标，磁性铁损失率仅为1.31%。基于Halbach永磁阵列的新型磁系磁选机是一种结构合理、磁能利用率高的贫磁铁矿石干式预选设备，可以有效提高分选效率，降低入磨矿量。

Application and Magnetic Design of a New Magnetic Separator Based on Halbach Permanent Magnet Array

It is pointed out that the magnetic system of the magnetic pulley and the updraft dry separator produces double-side magnetic field， while only one-side magnetic field acts on the separation space， so the utilization rate of magnetic energy is relatively low. Therefore a new magnetic system based on Halbach permanent magnet array is proposed and used to optimize the magnetic pulley and the updraft dry separator. On the basis of comparison between the old and new magnetic system， it can be seen that the new magnetic system enjoy much obvious advantages such as unilateral enhancement， high air gap magnetic density， and relatively large magnetic field utilization rate. Furthermore the tailings discarding experiment of the new magnetic system separator on a magnetic ore from Liaoning was carried out, discarding productive rate is 26.92%, magnetic iron recovery is 2.62%, loss rate of magnetic iron is 1.31%. The new magnetic separator based on Halbach permanent magnet array is a dry pre-beneficiation equipment for lean iron ore with reasonable structure and high-usage magneic energy. It can increase separation efficiency and reduce the amount of grinding capacity.