Influences of Grinding Media and Shape on Grinding

Influences of Grinding Media and Shape on Grinding

Grinding media, like steel balls, rods, and ceramic beads, significantly impact the grinding process. Contact modes include point, line, and surface contacts, even mixed forms. Their shapes are classified as follows:

(1) Spherical Grinding Media: Frequently employed in beneficiation plants, spherical media enable point contact, favoring coarse grinding. However, this can lead to excessive pulverization due to imprecise fracture at contact points. The sphere's diameter, pivotal for effective grinding, requires precise calculation. Prof. Duan Xixiang's half-theory formula guides practical ball size selection, based on fracture mechanics.

(2) Rod-shaped Grinding Media: Utilized in tungsten ore beneficiation, rod-shaped media involve mainly line contact, facilitating efficient coarse grinding with minimal over-pulverization. Rotating axially, these media lack the surface area for fine grinding.

(3) Columnar Grinding Media: A hybrid of spheres and rods, columnar media combine point, line, and surface contacts for both coarse and fine grinding. Selective breakage and minimal over-pulverization characterize its products, suiting coarse grinding. Rapid single-particle disintegration and uniformity come at the cost of high steel and material consumption.

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