仅一段磨矿的钨矿分级工艺探索

为解决传统钨矿选矿厂磨矿分级系统存在的反富集现象,在生产线上应用高频细筛对原使用螺旋分级机的磨矿分级流程进行了改造,对比分析了改造前后分级产品的性质,结果表明,应用0.3 mm筛网的高频细筛能解决“反富集”问题并减少WO₃在细泥中的分布;但要达到浮选给矿的粒度和WO₃金属分布率指标,高频细筛筛网应控制在0.15～0.20 mm。通过分析以及模拟设计,采用螺旋分级机和高频细筛组合分级、顺序返回的分级工艺具有一定的可行性,且具有诸多现实意义。

Classification of Tungsten Ore from One Stage Grinding Process

To solve the reverse-enrichment phenomenon existing in the grinding-classification system of conventional dressing plant of tungsten ore, the high-frequency fine screens(HFFS) were introduced to upgrade the original grinding-classification system where spiral classifier was adopted. Based on the comparison of the product properties before and after the technical innovation, it is concluded that application of HFFS with screen size of 0.3 mm can solve the reverse-enrichment problem and also reduce the WO₃ lost in fine mud. Nevertheless, the screen size of HFFS should be 0.15~0.20 mm for guaranteeing the feed size and WO₃ grade satisfying the succeeding flotation process. According to further analysis and simulation design, it is feasible and of practical significance to integrate spiral classifier with HFFS to form a comprehensive classification with the middlings returned in sequence.