From large ore chunks to fine powder, the process involves the "graded collaboration" of stone crushers and grinding mills.
The crushing of materials goes through five stages: Stone crushers handle the first three stages of "rough processing"—in the primary crushing stage, jaw and gyratory crushers reduce raw materials from 300 to 1500 mm to 100 to 350 mm chunks; secondary and tertiary crushing equipment then take over, further refining the chunks to 20 to 100 mm and 5 to 20 mm, respectively.
Grinding mills are responsible for "fine processing": coarse grinding reduces 5 to 20 mm material to 5 to 10 mm, and fine grinding (such as fine grinding of mineral powder) can further reduce it to 0.074 to 0.1 mm.
Interestingly, the equipment has different focuses: impact crushers are "multi-functional," capable of directly crushing 1000 mm raw materials to 10 to 30 mm; autogenous mills are even more "versatile," able to grind 600 mm material to less than 0.044 mm in one go, encompassing coarse, medium, and fine grinding processes. In actual production, the number of stages and the type of equipment used are determined by the initial particle size of the raw material and the requirements of the finished product. This "graded crushing technique" is the key to efficient industrial production.