Ball mill steel ball 1 The steel ball is not as hard as possible, but has its proper hardness value. Regarding the influence of hardness, generally speaking, as the hardness increases, as long as no crushing occurs, the unit cost of the steel ball decreases; and the deformation of the sphere is small, the absorption energy of the sphere is small during the crushing, and the energy can be more used for the crushing ore. Granules can increase the productivity of the mill. However, the increase in the hardness of the steel ball can only be moderate, and there is an appropriate range, not the harder the better. If only the ball consumption is considered, the higher the hardness, the lower the consumption. However, for the mill productivity, the productivity increases with the increase of the hardness of the steel ball within a certain range, but when the hardness exceeds a certain range, the mill productivity is adversely affected, and the mill productivity is lowered. When the hardness of the steel ball is too high, the ball and the ball slide in contact with each other, and the spherical particles between the balls cannot be effectively caught, so that the grinding effect of the ore particles is weakened. In studying the effect of steel ball hardness on grinding index, AB Kilboshen pointed out that laboratory tests have shown that steel balls have an optimum hardness problem for various types of ore. Therefore, according to this statement, the optimum values ​​of the hardness of various raw materials are different. High hardness does not necessarily increase productivity, or even decline. Only high productivity can reduce the unit consumption indicators. 2 ball mill steel ball density is also a problem that cannot be ignored. In general, the density of steel balls is affected by three factors. Effect of Material: steel, cast iron, alloy steel, of different materials of different density, the density of steel is larger than cast iron alloy according to the density and the content of the main alloying elements vary. The influence of the steel ball manufacturing method: the rolled and forged steel balls are dense in structure, so the density is large, and the microstructure of the cast cast steel balls, cast iron balls or cast alloy balls is not dense, and even there are pores therein, so the density is small. some. The density of rolled steel balls and forged steel balls can reach 7.8g/cm3, cast steel balls can only reach 7.5g/cm3, cast iron balls are lower, only 7~7.1 g/cm3. The influence of the metallographic structure of the steel ball: the density of different crystal structures such as martensite, austenite, bainite and ferrite is also different, which also affects the crystal fineness. to sum up Simply pursuing high hardness and low unit consumption is not right. High hardness and low unit consumption are not equal to low cost. Balls with high hardness and low unit consumption are often very expensive. Therefore, the primary criterion for selecting steel balls should be the high productivity of the mill and the low cost of the grinding media. Only high productivity and low grinding media costs can have good economic benefits. Economic benefits are a necessary condition for the survival and development of enterprises.
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The problem that the ball mill ball is easy to be ignored
The quality of the ball of the ball mill affects both the productivity and the ball consumption, which in turn affects the cost of the grinding media. The primary criterion for selecting steel balls should be the high productivity of the mill and the low cost of the grinding media. Only high productivity and low grinding media costs can have good economic benefits. When we choose steel balls, two problems are often overlooked.