Ultrafine Grinding and Classification Process and Equipment for Calcium Carbonate

The ultra-fine crushing and classification process of ground calcium carbonate (GCC) mainly involves processing calcium carbonate minerals into industrial-grade powders via crushing and grinding equipment. The process route and equipment selection are determined based on product requirements such as particle size, particle shape, whiteness, and particle size distribution. Grinding equipment is designed based on single or combined forces like impact, extrusion, and friction, which directly affect grinding efficiency and product fineness.

In large-scale dry production, common equipment includes Raymond mills, vertical mills, roller mills with classifiers, and ball mills with classifiers. Due to differences in crushing principles and discharge methods, the resulting powders vary significantly in particle shape, particle size distribution, and unit energy consumption, leading to distinct product positioning. Among these, ball mills can form a closed-circuit circulation system with classifiers, allowing coarse powders to be recycled for regrinding. In contrast, Raymond mills, vertical mills, and other equipment have limited grinding chamber capacity, making material recycling difficult and preventing closed-circuit operation. Additionally, ball mills operate at low speeds, minimizing impact and friction energy consumption. They are not only ideal for grinding high-hardness, abrasive minerals but also an economical choice for processing white filler minerals such as calcium carbonate.