强化高梯度磁选分离细粒黄铜矿和辉钼矿的研究

黄铜矿和辉钼矿存在磁性差异，因此理论上两者可以采用高梯度磁选分离，并且物料粒度和粒度分布是影响高梯度磁选铜钼分离效果的重要因素。本研究分析了磁介质捕获不同细度黄铜矿的特性，开展了脉动高梯度磁选分离不同粒度黄铜矿-辉钼矿纯矿物混合矿试验，并对比研究了实际铜钼混合精矿分级后和全粒级入选的脉动高梯度磁选效果。研究表明：脉动高梯度磁选对细粒黄铜的回收效果较差，且细粒辉钼矿在磁力捕获产品中的机械夹杂明显比粗粒辉钼矿更严重。铜钼混合精矿分级后的脉动高梯度磁选铜钼分离效果，明显优于全粒级铜钼混合精矿入选的铜钼分离效果。将铜钼混合精矿分级成+0.025 mm和-0.025 mm两个粒级后，在最佳条件下开展脉动高梯度磁选试验，获得的铜精矿铜回收率为55.36%，Cu和Mo品位分别为30.86%和0.067%，钼精矿Mo回收率为91.72%。该研究结果可以用于指导脉动高梯度磁选分离铜钼的工业应用。

Study on enhancing high gradient magnetic separation performance of fine-grained chalcopyrite and molybdenite

There exist magnetic differences between chalcopyrite and molybdenite, so they can be separated by high gradient magnetic separation theoretically, and the particle size and particle size distribution of material have significant effect on the high gradient magnetic separation efficient for chalcopyrite and molybdenite. In this investigation, the capture characteristics of rod matrix to chalcopyrite with different particle size was analyzed, and the experiment of separating pure mineral mixture of chalcopyrite and molybdenite with different size was carried out by pulsating high gradient magnetic separation. Besides, the performance of pulsating high-gradient magnetic separation for actual copper-molybdenum mixed concentrate after classification and at full grain size was carried out. The results show that: the pulsating high-gradient magnetic separation showed poor recovery for fine-grained chalcopyrite, and the mechanical clogging of fine molybdenite in magnetic capture products is obviously more serious than that of coarse molybdenite. Pulsating high-gradient magnetic separation for the classified copper-molybdenum mixed concentrate showed significantly better copper-molybdenum separation performance than the separation of copper-molybdenum separation at full grain size. After classifying the copper molybdenum mixed concentrate into two particle sizes of+0.025 mm and -0.025 mm, pulsating high gradient magnetic separation experiments were carried out under optimal conditions. The copper recovery rate of the copper concentrate obtained was 55.36%, the Cu and Mo grades were 30.86% and 0.067%, respectively, and the Mo recovery rate of the molybdenum concentrate was 91.72%. This research is of significance to guide the industrial application of pulsating high gradient magnetic separation of copper and molybdenum.