The Impact of Ball Milling Process Parameters on the Preparation of Nano Silicon Powder

When preparing nano silicon powder by high-energy ball milling, the grain size of the obtained nano silicon powder varies with different technical parameters set in the ball milling process. In order to explore the impact of different ball milling technical parameters on the grain size of nano silicon powder, this paper adopted the orthogonal experimental design in combination with fitting analysis, and set the agitator shaft speed of the ball mill and the milling time as the influence factors. Then this paper studied the impact of different ball milling technical parameters on the grain size of nano silicon powder, so as to work out the fitting function model and the optimal technical parameters for preparing nano silicon powder by high-energy ball milling. The experimental results showed that when the ratio of grinding media to material is 20: 1, without considering the influence of other factors such as temperature and humidity, when the agitator shaft speed is 1100/1200 rpm and the milling time is 150 min, the smallest grain size of nano silicon powder could be obtained, and the fitting formula of the agitator shaft speed and grain size is most consistent with the Gaussian approximation, which is 5.157*exp(-((x-706.8)/297.2)<^>2). This research holds value for practical application.