某金矿磨矿产品粒级优化试验研究

Experimental Study on Particle Size Optimization of Grinding Products in a Gold Mine

山东某金矿选厂磨矿作业存在介耗高、磨矿产品质量不达标、精矿回收率偏低等问题。在对矿石进行力学性质检测、球磨机给矿、排矿、分级机溢流、沉砂粒度分析的基础上,开展不同钢球球径配比的试验研究。研究发现矿石间力学性质差异性较大,存在高硬度且掺杂脆性矿石的现象,属难磨矿石。磨矿介质配比试验确定Φ100∶Φ80∶Φ60∶Φ40=15∶20∶30∶35为球磨机磨矿的最佳配比方案。最佳配比方案下磨矿产品,-0.074 mm级别产率增加了9.65个百分点,+0.28 mm不合格级别产率降低了8.22个百分点,磨矿技术效率提升了12.34个百分点,球磨机磨矿效率显著提升。

There are some problems in the grinding operation of a gold concentrator in Shandong, such as high medium consumption, substandard grinding product quality, low concentrate recovery and so on. Based on the mechanical property test of the ore, ball mill feeding, ore discharge, classifier overflow and grit particle size analysis, the experimental research on the ratio of different steel ball diameters was carried out. The research finds that there are great differences in mechanical properties between ores, and there is a phenomenon of high hardness and doped brittle ore, which is difficult to grind. The scheme of Φ100∶Φ80∶Φ60∶Φ40 = 15∶20∶30∶35 was finally determined as the best ratio scheme for the grinding operation of ball mill by grinding medium proportioning test. Under the best ratio scheme, the yield of-0.074 mm grade increases by 9.65 percentage points, the yield of + 0.28 mm unqualified grade decreases by 8.22 percentage points, and the grinding technical efficiency increases by 12.34 percentage points. The grinding efficiency of ball mill is significantly improved.