高梯度磁选在某低品位钼钨矿选矿中的应用研究

Application of high-gradient magnetic separation in the concentration of a low-grade tungsten-molybdenum ore

针对某高钙低品位钼钨矿,采用"强磁预处理-浮选"工艺回收钼钨,相较于"直接浮选",钨精矿品位、回收率明显提高,药剂成本大幅降低.为强化磁选预处理效果,在磁性分析的基础上,考察了高梯度磁选机磁感应强度、脉动冲次以及聚磁介质直径对强磁预处理效果的影响.结果表明,增大磁感应强度、减小脉动冲次,可提高磁选磁性产品产率,但钨钼损失随之增大;适当增大介质直径有利于加强对磁性物的捕捉.经磁选预处理后再浮选钨钼,钨精矿品位和回收率分别提高30%和16%、药剂成本降低近50%.

For the high-calcium low-grade molybdenum tungsten ore, the use of ＂high-gradient magnetic separation＂ process to recover molybdenum tungsten,compared to ＂direct flotation＂, tungsten concentrate grade, the recovery rate increased significantly, the cost of pharmaceuticals significantly reduced. In order to strengthen the pretreatment effect of magnetic separation,the influence of magnetic induction intensity, pulsating pulse and the diameter of the magnetic flux on the magnetic pretreatment of high gradient magnetic separator was investigated on the basis of magnetic analysis. The results show that increasing the magnetic induction intensity and reducing the pulsating pulse times can improve the magnetic product output, but the tungsten and molybdenum losses increase with the increase of the medium diameter. After pretreatment by magnetic separation, the tungsten and molybdenum, tungsten concentrate grade and recovery rate increased by 30% and 16% respectively, and the cost of pharmaceuticals was reduced by nearly 50 %.