subject: Correct Ball Material Doubles Ball Mill Efficiency [print this page] Select ball, two issues are often overlooked: the ball is not the more the better hard, butts appropriate hardness value; ball density is a can not be ignored. Hardness, in general, as hardness increases, they do not fractured, the ball unit consumption decreased; but also enable the sphere deformation, broken in the sphere deformation, energy used for crushing of mineral particles, enable the mill to increase productivity. The ball hardness increase can only be modest, there is a proper range is not as hard as possible. If you only consider the ball consumption is the hardness of the higher consumption lower. Increase mill productivity, and productivity within certain range with the ball hardness, but when the hardness exceeds a certain range of the mill productivity adversely affect mill productivity decline.
Ball density is affected by three factors:
1 ball rebound severe beating, causing part of the energy loss in the rebound, so the ball of energy is not used for crushing, and therefore the impact of fragmentation; material impact, steel, cast iron, alloy steel, different materials of different densities, the density of steel than cast iron, alloy steel, depending upon the density and content of main alloying elements and different.
2 ball manufacturing method, compact rolling and forging of steel balls of their organization, so the density, casting ball of cast steel, cast iron ball or cast alloy balls and other organizations are not even dense, and even have pores, so the density smaller.
3 ball microstructure of different crystal structures under the influence of martensite, austenite, bainite, ferrite body is not the same density, also affect the fineness of crystallization.
There are two reasons for adverse grinding ball hardness is too high:
1.ball rebound severe beating, causing part of the energy loss in the rebound, so the ball of energy is not used for crushing, and therefore the impact of fragmentation;
2.the steel ball hardness is high, the ball and ball touch each other between slide when bad, can't effectively rodent gore wave between the ball ore grain, make the magnetic particles ground action is reduced.
