破碎、磨矿与分级在碎磨流程方面有人提出,为了提高磨矿效率,降低磨矿作业的投资和经营费,降低碎矿产品的粒度总是有利的,对难磨矿石效果更为显著。为了达到此目的,认为采用闭路碎矿更为合理。同时指出,对中型以上的选厂,无论粗磨还是细磨,选用R+B(棒磨+球磨)的流程都是有利的,并在大姚铜矿生产实践中得到证实。有的作者 Crushing, grinding and grading It has been suggested in the crushing process that in order to improve the grinding efficiency and reduce the investment and operating costs of the grinding operation, it is always beneficial to reduce the grain size of the crushed ore products, and the effect is more significant on the refractory ore. In order to achieve this goal, it is considered more reasonable to adopt closed-circuit crushing. At the same time, it pointed out that the process of selecting R + B (rod mill + ball mill) for medium and large-sized plants, whether coarse or fine, is favorable and has been confirmed in the production practice of Dayao Copper Mine. Some authors