Separation mechanism of a pneumatic dry low-intensity drum magnetic separator and optimization of magnetic fields

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering Pub Date : 2025-05-22 DOI:10.1016/j.mineng.2025.109451

Dongdong Tang , Yongfeng Yan , Xiaosong Tian , Huixin Dai , Liwei Wu , Feiwang Wang

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引用次数: 0

Abstract

Composite force field magnetic separators, which combine a high-velocity air stream with a magnetic field, are a potential type of equipment for processing iron ore in arid and cold regions. In a previous study, we developed a pneumatic dry low-intensity drum magnetic separator (PDLDMS) and investigated its performance in the recovery of fine-grained magnetite. In this study, we extended the study of this PDLDMS by employing a validated multi-physical field coupling model to investigate the separation efficiency of mineral particles on each magnetic pole, and we optimized the magnetic field strengths within each area. The simulation results indicated that a large number of coarse-grained low-grade particles and fine-grained high-grade particles were captured in the same area (A5, A6, A7, and A8) on the surface of the separation drum, displaying equal recoverability. The coarse-grained low-grade particles in areas A5, A6, and A7 were preferentially captured in the more anterior position on the surface of the drum compared with the fine-grained high-grade mineral particles in areas A6, A7, and A8. When the drum rotated, a layered wrapping of coarse-grained low-grade intergrowth particles was formed. The equal recoverability and layered wrapping were the main reasons for the low grade of the concentrate and the difficulty of improving the separation efficiency. When the remanent magnetism values of magnetic poles N1, S1, N2, S2, N3, S3, N4, and S4 were 0.3, 0.3, 0.5, 0.3, 0.3, 0.2, 0.3, and 0.5 T, respectively, it was possible to reduce the recovery of low-grade intergrowth particles while ensuring the recovery of high-grade mineral particles. The experimental results revealed that after optimizing the magnetic field strengths, the grade of the concentrate in the area corresponding to each magnetic pole was significantly higher than that before optimization. The total concentrate grade was 61.74 %, which was 3.12 % higher than that before optimization of the magnetic field. However, the recovery only decreased by 3.14 %.

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气动干式低强度滚筒磁选机的分离机理及磁场优化

复合磁场磁选机将高速气流与磁场结合在一起，是一种潜在的在干旱和寒冷地区处理铁矿石的设备。在之前的研究中，我们开发了一种气动干式低强度滚筒磁选机（PDLDMS），并研究了其在细粒磁铁矿回收中的性能。在本研究中，我们扩展了该PDLDMS的研究，采用验证的多物理场耦合模型来研究矿物颗粒在每个磁极上的分离效率，并优化了每个区域内的磁场强度。模拟结果表明：在分选滚筒表面A5、A6、A7、A8的同一区域内捕获了大量粗粒低品位颗粒和细粒高品位颗粒，具有相同的回收率。与A6、A7、A8区细粒高品位矿物颗粒相比，A5、A6、A7区粗粒低品位矿物颗粒优先捕获在鼓体表面更靠前的位置。当滚筒旋转时，形成一层粗粒低品位共生颗粒包裹。回收率等、包裹层状是导致该精矿品位低、分离效率难以提高的主要原因。当磁极N1、S1、N2、S2、N3、S3、N4和S4的剩磁值分别为0.3、0.3、0.5、0.3、0.3、0.2、0.3和0.5 T时，可以在保证高品位矿物颗粒回收的同时降低低品位共生颗粒的回收率。实验结果表明，磁场强度优化后，各磁极对应区域的精矿品位显著高于优化前。总精矿品位为61.74%，比磁场优化前提高3.12%。然而，回收率仅下降了3.14%。

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来源期刊

Minerals Engineering 工程技术-工程：化工

CiteScore

8.70

自引率

18.80%

发文量

519

审稿时长

81 days

期刊介绍： The purpose of the journal is to provide for the rapid publication of topical papers featuring the latest developments in the allied fields of mineral processing and extractive metallurgy. Its wide ranging coverage of research and practical (operating) topics includes physical separation methods, such as comminution, flotation concentration and dewatering, chemical methods such as bio-, hydro-, and electro-metallurgy, analytical techniques, process control, simulation and instrumentation, and mineralogical aspects of processing. Environmental issues, particularly those pertaining to sustainable development, will also be strongly covered.