Ball mill Steel ball is ball Mill The equipment grinds the material medium, which is an important foundation for grinding and stripping through the collision friction between the steel balls of the ball mill and the material spare parts In particular, accurate industrial steel balls play a huge role in the development of the national economy. The output of ball mill is not only affected by the load of steel ball, but also related to the diameter of steel ball. It is required to have a certain ball diameter and maintain a certain proportion of balls with different ball diameters, so there are two important indicators to judge whether the steel ball is wear-resistant: steel ball hardness and steel ball density.
1、 Steel ball has proper hardness value
Generally speaking, with the increase of hardness, as long as there is no breakage, the unit consumption of steel ball decreases; Moreover, it can make the ball deform less, and the ball deforms less during crushing. The energy can be used more for crushing ore particles, which can increase the productivity of the mill. However, the increase of steel ball hardness can only be moderate, with an appropriate range, not the harder the better. If only ball consumption is considered, the higher the hardness, the lower the consumption.
Adverse effects of high steel ball hardness on grinding:
1. The rebound bounce of steel ball is serious, causing partial energy loss in the rebound, so the steel ball energy is not used more for crushing, which affects crushing;
2. When the hardness of the steel ball is too high, the ball will slide heavily when contacting with each other, and the particles between the balls cannot be effectively meshed by Kiel wave, which will weaken the grinding effect of the particles.
2、 Density of steel ball
Generally speaking, the productivity of balls with the same size and high density is high, while the productivity of balls with low density is low.
Factors affecting the density of steel balls:
1. Material impact: steel, cast iron, alloy steel, etc. The density of different materials is different, the density of steel is greater than that of cast iron, and alloy steel varies according to the density and content of main alloy elements.
2. The influence of steel ball manufacturing method, rolled and forged steel balls are densely prepared, so the density is high, casting The preparation of cast steel ball, cast iron ball or cast alloy ball is not very dense, even with pores, so the density is smaller.
3. The density of martensite, austenite, bainite, ferrite and other different crystal structures is different due to the influence of metallographic preparation of steel ball, which also has an impact on the crystal fineness.
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