The Relationship between Ball Mill Liner and Grinding Balls

Liner and the ball is a mutual relationship between them and the material, together to form three-body abrasive wear. But what is good? It should be said to borrow the mechanical design of the "base hole system" or "axis system" concept to understand is the best. In the case of a ball mill, the impact of the liner on production is much greater than that of the balls, it should be a "base plate". Therefore, the choice of lining and grinding balls, the first decision should be lining, must ensure that the life of the ball mill liner over the two overhaul period, and as much as possible not to repair. Preference is given to those liners with high reliability and high abrasion resistance. For example: combination of solid chrome cast iron lining, the power plant coal mill service life of up to 20 years, cement mill life of 10 years, and almost no maintenance.

Double medium quenching alloy steel liner in the power plant, coal mill service life is more than 8 years, about three years of cement mill, iron ore about 10 months. Even the dual-media quenching of low chromium alloy steel liner in the power plant coal mill life can be more than 6 years, the cement mill in about 2 years, the life of the iron ore mill is also more than 8 months.

Lining and grinding ball hardness should be HRC50 or more, mainly because the hardness of the abrasive in the Mohs hardness is 6 to 7, estimated close to HRC60, theoretically grinding media hardness is greater than or equal to eight percent abrasive hardness ten with an ideal anti-wear effect.
After Lining decision, the ball is easy to choose, as long as the life of the liner to ensure that two overhaul period, it should be advocated grinding the best anti-wear performance is the preferred choice. If the liner and the ball can be said for 10 years without changing it, of course, is ideal. A principle: reduce costs, reduce labor intensity, increase the ball mill operation rate.
Under the premise of the "substrate system", allowing the balls of ball mills is higher than the liner hardness HRC3 ~ 5, which is out of the high manganese steel liner, and the spread of the concept is fundamentally different.