The ball mills at home and abroad widely adopt high-carbon high alloy class casting grinding balls and high-carbon low-alloy class forging or casting grinding balls; the vast majority of dry production in thermal power plants and cement industry use high or low chrome cast iron grinding balls, and wet process in mine adopts high-carbon low-alloy grinding balls.
There are many types of grinding balls at home, due to the imperfections of market economy, the use of grinding balls is not determined according to the process efficiency, with great randomness. The main varieties include: 1) high chromium alloy cast iron, such as: Cr8, Cr12, Cr15, Cr18, Cr24, Cr26; 2) low-chromium cast iron, such as Cr2 and martensitic ductile iron class. Martensite ductile iron and low chromium cast iron are in the same level in terms of abrasion resistance, and different in the production process. High-alloy cast iron is with excellent anti-wear performance, the higher the alloy, the better anti-wear performance, and it also has good economic benefits.
In dry grinding process of power plants and cement factories, the abrasion of a ton of high chrome ball is only 15 to 50 grams; using high chrome ball not only can save cost, reduce workers’ labor, reduce grinding mill, and also reduce the waste of limited human resources. It should be said bluntly that the high chrome ball is green and environmental protection.
Forging ball and rolling ball belong to high-carbon chrome molybdenum alloy and low-carbon manganese alloy class. Forging ball and rolling ball have simple process and low manufacturing costs; considering of the economic benefits, the wet process of mining class generally adopts low chromium alloy ball; the wear in iron ore, copper ore and molybdenum ore is generally between 500 to 700 grams. Improve the hardness of low chromium alloy ball is the most effective way to reduce abrasion so that improve economic efficiency.
Having selected the material, the gradation grinding balls becomes very important. Ideal balls gradation plus the suitable liner surface shape allows the mill to obtain maximum efficiency.
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