常规磁选柱利用脉动方波磁场产生顺序下移的磁场力来吸引磁性颗粒向下运动，从而使磁性颗粒与脉石颗粒分开达到选分目的。由于脉动方波磁场的磁力作用方式是不连续的，在上升水流动力较大的情况下就会导致磁选柱尾矿品位偏高。为了解决这一问题，探讨了在保持精矿品位提高幅度不变的情况下，改变磁选柱的供电方式，使磁选柱的供电机制由以前的脉动方波磁场改为现在的连续行波磁场，尽量降低磁选柱尾矿品位。由于连续行波磁场采用的是连续供电的方式，不存在通断电瞬间的磁场力缺失状态，因此可以确保磁性颗粒持续受力，逐渐下移。在这一改进的基础上，在实验室中应用常规磁选柱和行波磁场磁选柱分别处理弓长岭某磁铁矿经过两段磨矿之后的细筛筛下矿样，并且对选别指标进行了比较。实验结果表明，行波磁场磁选柱在保持精矿品位和精矿产率基本不变的情况下，其尾矿品位较常规磁场磁选柱明显低1～1.5百分点。

Conventional column magnetic separator used pulsating square magnetic field to generate sequential downward magnetic force to attract magnetic particles, so as to separate magnetic particles from gangue particles to achieve the purpose of beneficiation. Due to the discontinuous magnetic action of pulsating square wave magnetic force, higher tailings concentration and larger tailings circulation would produced when the upward water flow force were increased. In order to solve this problem, the power supply mode of column magnetic separator is changed from pulsating square wave magnetic field to continuous traveling wave magnetic field, so as to reduce the grade of tailings as much as possible. On the basis of this improvement, the conventional column magnetic separator and the column magnetic separator with traveling−wave magnetic field were applied to process the fine sieve samples of a magnetite after two grinding in the laboratory, and the separation indexes were compared. The test results showed that the tailing grade of the column magnetic separator with traveling−wave magnetic field was obviously 1 ~ 1.5 percentage points lower than that of the column magnetic separator with pulsating square wave magnetic field, while the concentrate grade and fine mineral yield were basically unchanged.