ABSTRACT

A comprehensive investigation was conducted to delineate the effect of ball size distribution, mill speed, and their interactions on power draw, charge motion, and balls segregation in a laboratory-scale mill. The mill was simulated at different critical speeds with different mill fillings. In total, 165 scenarios were simulated. When the mills charge comprising 60% of small balls and 40% of big balls, mill speed has the greatest influence on power consumption. When the mill charge is more homogeneous size, the effect of ball segregation is less and so the power consumption of the mill will be less affected. The shoulder angle compared to the toe angle is more affected by the increase in mill speed. The small balls move to the outer layer of the ball charge and interrupt the contact of big balls with the mill liners and lifters and preventing them from rising and their presence in the cataracting regime and this is exacerbated when the small ball fraction increase. The big balls mostly appear in the cascading flow region, and then more involved in the attrition breakage mechanism, and this is exacerbated when the mill speed increase.

摘要

在实验室规模的磨机中，进行了一项全面调查，以描述球尺寸分布、磨机速度及其相互作用对功率消耗、装料运动和球分离的影响。磨机在不同的临界速度下用不同的磨料进行模拟。总共模拟了 165 个场景。当磨机装料由60%的小球和40%的大球组成时，磨机速度对功耗的影响最大。当磨机装料粒度较均匀时，球离析的影响较小，因此对磨机电耗的影响较小。与趾角相比，肩角受轧机速度增加的影响更大。小球移动到球装料的外层并中断大球与磨机衬板和升降机的接触并防止它们上升和它们出现在白内障状态中，当小球分数增加时，这种情况会加剧。大球多出现在级联流动区域，然后更多地参与磨损破碎机制，当磨机转速增加时，这种情况加剧。