Aiming at the problems of Fe grade in tailings of rough low intensity magnetic separation with annular magnetic separator higher than that of the on-site drum magnetic separator in dressing plant of Dagushan,the modification measures by adding an always-on magnet exciting coil to the annular magnetic separation and installing magnetic yoke rings to all the magnetic exciting coils have conducted.The key parameters of the improved annular magnetic separator were investigated and the beneficiation effects of the annular magnetic separator before and after improvement were contrasted.The result showed that under the same parameters and testing conditions,the improved annular magnetic separation not only guarantees the quality of concentrate,but also the percentage of Fe grade reduces 2.2,and the percentage of Fe recovery increased 2.95,the ideal modification effect was achieved.%针对大孤山选矿厂磁选环柱弱磁粗选尾矿铁品位高于现场筒式磁选机的问题,对原磁选环柱进行了增设1个常通电励磁线圈和在所有励磁线圈上增设聚磁环轭的改造,研究了改进后磁选环柱的重要工作参数,并对改进前后的磁选环柱进行了选矿效果对比.结果表明,在设备工作参数和试验条件相同的情况下,改进后的磁选环柱既保证了精矿质量,又降低了尾矿铁品位2.2个百分点,提高了精矿铁回收率2.95个百分点,达到了理想的改造效果.
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