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常用于高梯度磁选的不锈钢钢毛通常其断面接近矩形。本文阐述了在这种单丝上进行正面和背面磁性捕收的研究工作,研究利用高速摄象机和图象处理系统完成。所获结果与圆形镍丝的结果进行了比较。在不同条件下,堆积在单丝上的磁性物具有不同的形状。作者还通过颗粒轨迹的分析研究了单丝背面尾流区内涡流磁性分离的机理,采用图象处理系统揭示出在中等雷诺数条件下,临界点附近的折返流速一般小于1cm/s,这有益于单丝背面的磁性颗粒捕收,因为折返流产生的竞争力(拉力)远小于单丝正面矿浆流产生的拉力。
Stainless steel steel commonly used in high gradient magnetic separation usually has a nearly rectangular cross section. This paper describes the research work on front and back magnetic capture on such monofilaments, using high-speed cameras and image processing systems. The results obtained were compared with those of round nickel wire. Under different conditions, the magnetic materials deposited on the monofilaments have different shapes. The author also studied the mechanism of eddy current magnetic separation in the wake area of the monofilament by means of particle trajectory analysis. The image processing system revealed that the reentrant flow velocity near the critical point is generally less than 1 cm / s under moderate Reynolds number, which is beneficial The collection of magnetic particles on the back of the monofilament is much less competitive (pull) due to the turn-back flow than the pull force generated by the stream of pulp on the front side of the monofilament.