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在球磨制备高浓度煤浆中，避免球动能以及球与颗粒之间的碰撞风率的减少是必要的，装入粒度有显著差异的二元混合球，对细磨是有效的，对上述提法的试验验证用一台装有19mm和1.2mm的二元混合钢球的实验室规模球磨机来完成．对磨矿的进展用一台筛孔为3μm的筛子来评价．总之，上述考虑都已被试验验证．
In the preparation of high concentration coal slurry by ball milling, it is necessary to avoid the ball kinetic energy and the reduction of the collision wind rate between the ball and the particles. Loading binary mixed balls with significant differences in particle size is effective for fine grinding. The French test was performed using a laboratory scale ball mill equipped with 19 mm and 1.2 mm binary hybrid steel balls. The progress of the grinding was evaluated using a sieve with a mesh opening of 3 μm. In short, the above considerations have been tested.