For further improving recovery of ultrafine paramagnetic minerals, optimization of horizontal high intensity magnetic separator (HIMS) is of great significance. Grooved plates are key component of the HIMS system. Previous study showed that grooved plate with elliptic teeth had better magnetic characteristics and particle capture performance than conventional plate with right-angle teeth, but those for the case of only one piece of plate were studied and compared. In actual HIMS of multiple plates, magnetic characteristics of grooved plates will be affected by adjacent plates and plate spacing is definitely an important parameter influencing separation performance. In this study, particle capture and separation performance of multiple grooved plates with elliptic teeth was investigated theoretically and experimentally. High magnetic field area of opposing plates overlapped with each other under small teeth tip spacing and gradually decoupled with increasing spacing. Grooved plates with elliptic teeth of aspect ratio 2 could have higher particle capture cross section area and space utilization rate than conventional ones with right-angle teeth. As teeth tip spacing increased, particle capture cross section area increased firstly and then kept constant or slightly decreased, with space utilization rate decreasing throughout. Experimental results were in accordance with theoretical analyses except for those under small teeth tip spacing, which was caused by saturated particle buildup and exacerbation of mechanical entrainment. There existed the optimal teeth tip spacing for the highest separation efficiency. Superior separation performance could be obtained by elliptic teeth plates with aspect ratio 2 under teeth tip spacing 2 mm, indicating good application potential of elliptic teeth plate in processing weakly magnetic minerals.

中文翻译：

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椭圆齿槽板强磁分离中板齿间距对颗粒捕获的影响


对于进一步提高超细顺磁性矿物的回收率，卧式强磁选机（HIMS）的优化具有重要意义。沟槽板是 HIMS 系统的关键组成部分。先前的研究表明，椭圆齿槽板比传统直角齿板具有更好的磁特性和颗粒捕获性能，但仅对只有一块板的情况进行了研究和比较。在实际的多板HIMS中，沟槽板的磁特性会受到相邻板的影响，板间距无疑是影响分离性能的重要参数。本研究从理论上和实验上研究了椭圆齿多槽板的颗粒捕获和分离性能。相对板的高磁场区域在较小的齿顶间距下彼此重叠，并随着间距的增加而逐渐解耦。长宽比为2的椭圆齿槽板比传统的直角齿槽板具有更高的颗粒捕获截面积和空间利用率。随着齿尖间距的增大，颗粒捕获截面积先增大后保持不变或略有减小，空间利用率始终降低。实验结果与理论分析一致，但小齿顶间距下的实验结果除外，这是由饱和颗粒堆积和机械夹带加剧引起的。存在最佳的齿顶间距以获得最高的分离效率。 长径比为2的椭圆齿板在齿顶间距2mm下可获得优异的分选性能，表明椭圆齿板在选别弱磁性矿物方面具有良好的应用潜力。