What is the impact of “dissociation” and “over-crushing” on the mineral separation process?

The crushing process of ore is a process in which the size of the nugget is greatly reduced, and various useful mineral particles are dissociated in the process of decreasing particle size. In the crushed ore. Some of the minerals that were originally born together, some of which are cracked along the mineral at their interface, become small particles containing only one mineral called monomer dissociation particles, but there are still some small ore particles still composed of several minerals. Liansheng together said the continuous particles. The so-called mineral dissociation degree is the ratio of the number of particles of the mineral monomer dissociated particles to the sum of the number of particles of the continuous particles containing the mineral and the number of monomer dissociated particles of the mineral, expressed as a percentage.

If the grinding product is too coarse, the dissociation is insufficient and the selected concentrate grade and recovery rate are low. However, if it is too fine, although the dissociation of useful minerals is sufficient, it will produce more fine particles that are difficult to select, that is, the phenomenon of “over-crushing” occurs. “Over-crushing” not only harms the sorting process, but also reduces the grade and recovery rate of the concentrate, and because of the “unnecessary crushing”, the consumption of the crushing process and the sorting process is increased, and the cost of dressing is increased. Therefore, suitable grinding fineness is a necessary condition for achieving good sorting of useful minerals and gangue minerals. The mineral processing workers should pay attention to the selection of the crushing process and equipment, strictly control the operating conditions, and strictly control the grinding fineness in the best range determined by the ore dressing test.

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