Analysis of Influencing Factors of Gangue Ball Milling Based on Multifractal Theory

To study the heterogeneity and local of gangue particle size distribution (PSD) under ball milling, from northern Shaanxi coal mine was taken as a research object. The multifractal pattern PSD variation trend characteristic parameters different ball-to-gangue ratios grinding times were analyzed by introducing theory microscopic methods such laser analysis scanning electron microscopy. results show that characteristics with time periods demonstrate obvious changes. When ratio is 3~9, D(0), D(1), Δα, Δf all linear changes time. It demonstrated due to phenomenon agglomeration during significantly when 12~15. Furthermore, indicate increase in time, decreasing first then increasing, D(1) D(1)/D(0) increasing decreasing, both reach their extreme values at 30 min.