When select ball, two issues are often overlooked: the steel ball is not as harder as better, but need appropriate hardness value; Ball density is also a problem that cannot be overlooked. Hardness, generally, with the hardness increases, as long as it does not occur crushing, unit consumption of ball declines; it also enables sphere to deform, small sphere can save more energy for crushing the ore particles and increase in the productivity of the mill. The increase in ball hardness can be only moderate within a proper range, is not as harder as better. If you only consider the ball consumption, it is the higher the consumption, the lower the hardness. Within a certain range, mill productivity increases with the increase in ball hardness; when hardness exceeds a certain range, it will adversely affect the productivity of the ball mill.
Ball density is affected by three factors:
1. Material; steel, cast iron, alloy steel, different materials have different densities; the density of steel is large than that of cast iron, alloy steel depending upon the density and content of the main alloying elements.
2.steel ball manufacturing method; rolled and forged steel ball has dense organizations, so it has large dense, casting steel ball, cast iron ball or casting alloy balls and other organizations are dense, even have pores, so the density is smaller.
3. Ball microstructure; martensite, austenite, bainite, ferrite, etc. have different crystal structures, so the densities are not same; and it also has an impact on the crystallization degree of fineness.
There are two negative reasons for grinding when ball hardness is too high:
1. Serious ball rebound beating may cause a portion of the energy to be lost in the rebound, so steel ball energy is not for breaking, and therefore the impact the crushing efficiency;
2. If ball hardness is too high, the sliding between ball and ball are powerful, cannot be effectively bite ore particles between the balls, so that the mineral particles of the milled is weakened.
As for the influence of density on grinding, in general, the balls of same size, the large density productivity, the smaller the productivity.
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