Abstract: Seeking to replace steel balls as fine grinding media to improve the grinding effect is the pursuit of mineral processing plant. In this work, the grinding test of magnetite-quartz system ore with ceramic ball as grinding media were conducted, the response surface method was used to study the effect of ceramic ball size, filling rate and grinding concentration on the average particle size of the grinding product, and the significance of their interaction was analyzed. The results showed that the filling rate had the greatest influence on the average particle size of grinding products, followed by the grinding concentration, and the ball size was the smallest. The interaction between ball size and grinding concentration was the most significant, followed by the interaction with filling rate, while the interaction between filling rate and grinding concentration was not significant. The optimal test conditions predicted by the model were the ball size was 25.96 mm, the filling rate was 34.04%, and the grinding concentration was 70.86%, and the predicted value of the average particle size of the ground product under these conditions was 54.46 μm, which is similar to the experimental average value of 54.41 μm, indicating that the prediction model was reasonable and effective. Comparison of ceramic ball and steel ball test research showed that fine grinding with ceramic ball as grinding media, grinding effect can be significantly improved, and the -0.075 mm particle size yield increased, which was related to the ceramic ball in the mill falling motion was better than the steel ball, ceramic ball crushing rate of fine particle size was higher than the steel ball, which was conducive to improving the effect of grinding. Ceramic ball milling was a new generation of fine grinding technology development direction.

Key words: Response surface method, Ceramic balls, Magnetite-quartz mixed system, Average particle size, Fine grind

摘要： 寻求替代钢球作细磨介质以提高磨矿效果是选矿厂的追求。本工作以瓷球为磨矿介质对磁铁矿-石英体系矿石进行磨矿试验，利用响应曲面法研究了瓷球球径、充填率及磨矿浓度对磨矿产品平均粒度的影响及其交互作用的显著性。结果表明，充填率对磨矿产品平均粒度影响最大，磨矿浓度次之，瓷球球径最小。瓷球球径与磨矿浓度的交互作用最显著，与充填率的交互作用次之，而瓷球充填率与磨矿浓度的交互作用不显著。通过模型预测最优试验条件为：瓷球球径为25.96 mm，磨矿充填率为34.04%，磨矿浓度为70.86%，该条件下磨矿产品平均粒度的预测值为54.46 μm，与实验平均值54.41 μm相近，表明预测模型是合理有效的。瓷球和钢球对比试验研究表明，细磨中以瓷球为磨矿介质，磨矿效果能够得到明显提升，-0.075 mm粒级产率增大，这与瓷球在磨机中的抛落运动优于钢球有关，瓷球对细粒级的破碎速率高于钢球，有利于提高磨矿效果。瓷球磨矿是新一代细磨技术的发展方向。

关键词: 响应曲面法, 瓷球, 磁铁矿-石英体系, 平均粒度, 细磨