A Review of Advanced Ball Mill Modelling

Experimental study on the grinding rate constant of solid materials in a ball mill

Dissolution of particles of pyrite mineral by direct attachment of Thiobacillus ferrooxidans

Experimental investigation on a grinding rate constant of solid materials by a ball mill: effect of ball diameter and feed size

It is known that ball milling is an energy intensive process and great efforts have been made over the years to improve energy efficiency. The use of population balance models (PBMs) can assist in the design of mineral processing circuits and the scale-up of laboratory mill results to full-scale. However, since each model has its own capabilities and limitations, it is believed that a combined use will provide more accurate information for the reliable description of the process. In this study, the simulation of grinding of quartz is investigated in order to identify the optimal mill operating parameters. With the use of population balance modeling the specific rate of breakage and the cumulative breakage parameters can be determined from mono-size, short grinding time batch tests. The determined breakage parameters were back calculated by minimizing the residual error between experimental and reproduced size distributions. By combining two software packages the back calculated breakage parameters were used for the prediction of the optimum ball filling volume. The proposed procedure can be also applied for the identification of optimal mill operating parameters for other minerals.

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Identification of Optimal Mill Operating Parameters during Grinding of Quartz with the Use of Population Balance Modeling

An analysis of the selection function for mills using balls as grinding media

Based upon a simplified grinding mechanism, an analysis of the selection function is made for vibration mills. The mechanism considered is that a particle nipped by two colliding balls is to be ground only if the ball impact generates or activates at least one crack within the particle and the crack is big enough for fragmentation. The derived selection function increases with increasing size up to a certain value and then decreases with increasing particle size. This trend has been observed elsewhere by experiment. Also, the present paper examines the effects of the ball on the selection function.

Kenji Hosoda

Papers

An analysis of the selection function for mills using balls as grinding media

An Analysis of the Selection Function for Mills Using Balls as Grinding Media