Abstract
In order to investigate the breakage behavior of the feed in industrial secondary ball mills, the breakage characteristics of fine magnetite were analyzed. Magnetite particle breakage produces a bimodal particle size distribution that is consistent with the typical breakage characteristics of abrasion. The secondary ball mill can increase the surface area by reducing the diameter of steel balls to enhance the abrasion. Industrial application results show that after the abrasion of the secondary ball mill for grinding magnetite was enhanced, the circulating load of the grinding-classification system dropped by 29.90% and the specific energy of the secondary ball mill decreased by 39.14%. At the same time, the consumption of steel balls also dropped from 0.17 kg/t to 0.13 kg/t, a decrease of up to 20%. It should be noted that the reduction in the ball diameter should follow certain rules because if the energy of a single collision is lower than the critical breaking energy of the particles, the grinding process will be affected and thus have counterproductive effects.
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