提高磁选机介质回收率的方法

重介选煤厂介耗是重要的技术指标,也是重要的经济评价指标。介质损失大造成介耗高,污染环境,降低产品质量,介耗的高低对生产系统的稳定起着重要作用。磁选机是介质回收净化的关键设备,磁选回收率直接影响重介生产介耗。磁选机磁选效率受多因素影响,入料浓度、入料稳定性、磁系偏角等因素都对磁选效率产生影响。济三煤矿选煤厂重介车间采用12台圆筒式磁选机,由于入料系统,脱磁装置、矿浆浓度等因素制约磁选机性能,造成磁选效率不高,磁选尾矿带介偏高。通过改造重介车间磁选机,介耗由原来的2.8 kg/t,降至1.6 kg/t,效果明显。 The medium consumption of dense-medium coal preparation plant is an important technical and economic evaluation index,it also influences the coal preparation cost. High dense-medium loss lead to large medium consumption, environmental pollution and poor products quality. The reasonable medium consumption plays an important part in stabilizing production. The magnetic separation efficiency is influenced by feed concentration and stability,declination and the like. The coal preparation plant adopts twelve cylinder magnetic separators,their characteristics are restricted by feeding system,demagnetizing devices,pulp concentration. The consequence is that the magnetic separation efficiency is low and lots of medium mixed in tailings. After transformation,the medium consumption decrease from 2. 8 kg/t to 1. 6 kg/t