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在选矿厂生产实践中常常由于金属物体(主要是采矿场里混入矿石中的钎子头、钎子杆、深孔鑽机鑽头,运输设备零件等)落入碎矿机内而引起停车事故,有时会造成碎矿机断轴,严重的影响选矿厂的正常生产,造成巨大的经济损失;例如寿王坟铜矿在1958年因此类事故断轴三根损失达28万元(停车损失未计算在内),根据南芬铁矿选矿厂1959年1～7月统计,共断大轴18根,噎铁97次,少处理矿石四万多吨。目前国内外已有非磁性矿物金属探测器都不能应用于具有磁性矿物的选矿厂中,因为当磁性矿物通过时和铁质金属物体一样会使仪器动作,无法把矿石和金属物体区别开来。
In the practice of the concentrator, parking accidents often occur due to the falling of metal objects (mainly the brazier head, the rod of the brazing rod, the deep hole drill bit, the transportation equipment parts, etc.) mixed in the ore in the ore dressing plant For example, the Shouwangfen copper mine lost a total of 280,000 yuan in losses due to such accidents in 1958 (the loss of parking was not calculated ), According to Nanfen iron ore beneficiation plant from January to July 1959 statistics, a total of 18 large shaft, iron 97 times, less processing more than 40,000 tons of ore. At present, none of the non-magnetic mineral metal detectors at home and abroad can not be applied to concentrators with magnetic minerals because when the magnetic minerals pass through, the same actions as the ferrous metal objects cause the instruments to be unable to distinguish the ore from the metal objects.