提高湖南某选矿厂磨矿产品浓度工业试验研究

Industrial Experimental Research on Increasing Concentration of Grinding Products in a Concentrator in Hunan

针对湖南某多金属矿新建选矿厂所需浓密机占地面积大、建设成本高、施工周期长等问题,尝试提高分级产品浓度来减小浓密机面积甚至取消浓密机,实现精简、高效、低能耗的矿石预处理,开展了水力旋流器补加水、锥角、柱体高度试验以及沉砂嘴直径试验。结果表明,选用锥角90°、柱体高度800 mm及沉砂嘴直径50 mm的“长柱短锥”型水力旋流器,溢流浓度由34%提高至44%以上,分级效率提高了0.77个百分点,-74μm粒级含量稳定在70%以上,易选级别含量增加了2.19个百分点,WO3金属分布率增加了9.87个百分点,且后续浮选作业钨、钼、铋产品品位、回收率稳定。

As for the thickener designed for the new concentrator of a multi-metal mine in Hunan,aiming at the problems of covering a large area,high cost and long period of time for construction,efforts were made to increase the concentration of products from classification for reducing thickener area or even cancelling thickening operation,so as to actualize a simple,efficient and low energy-consuming pre-treatment of feed ore.For this purpose,experiments were carried out to determine parameters,such as hydrocyclone replenishment water,cone angle,cylinder height and apex diameter.It is found that by using a hydrocyclone consisting of a long cylinder and a short cone with cone angle of 90°,cylinder height of 800 mm and apex diameter of 50 mm,the overflow concentration can be increased from 34%to more than 44%,with the classification efficiency up by 0.77 percentage points,and the content of-74μm size range is stabilized at more than 70%.Therewith,the content of easy-to-separate range increases by 2.19 percentage points and the WO3 distribution increases by 9.87 percentage points.Furthermore,the grade and recovery of tungsten,molybdenum and bismuth all become stabilized in the follow⁃up flotation operations.