一种新型磨矿介质设计与磨矿试验研究

Development of forged ball as a new grinding medium

为了缓解硫化矿选厂粗粒欠磨与细粒过磨等问题,设计了一种新型磨矿介质-黄金分割锻球.通过2种介质磨矿试验对比,表明锻球磨矿具有针对性强,磨矿效果好,试验指标显示:锻球磨矿的产品粗粒会减少0.80%,中等粒级增加3.26%,细粒减少2.46%.分析发现锻磨在磨矿中与物料接触有相当一部分为线接触,细粒因粗粒的"架桥"作用而减少了过粉碎,钢球介质与矿物接触为点接触,粗粒的架桥作用不明显,对粗粒与细粒的粉碎作用具有一致的概率,故选择性差,过粉碎现象严重.设计的锻球介质能明显的缓解粗粒欠磨与细粒过粉碎等问题.

Golden section forged ball as a new type of grinding medium is designed in order to overcome the problem of inadequate grinding coarse particles and overly grinding fine particles in the former grinding process.Grinding experiments with two grinding mediums, cylindrical ball and steel ball, show that forged ball milling has favorable grinding results, coarse particle size and fine particle size dropping by 0.80% and 2.46% respectively, while medium size increasing by 3.26%. In the grinding process by forged ball, line contact exists between the forged ball and milled ore, which reduces the overly grinding due to coarse particles ＇ bridging effect. However, the bridging effect of coarse particles by steel ball is not observed for the dot contact between steel ball medium and grinded ore. Thus, the milling process by steel ball has unfavorable particle selection.The grinding medium by the golden section forged ball can solve the technical difficulties of inadequate grinding coarse particles overly grinding fine particles.