The grinding ball is widely used all over the world for high carbon high alloy casting grinding ball and high carbon low alloy forging grinding ball (or cast grinding balls), in the dry production technology of thermal power plant, cement industry, the vast majority of the use of high, low chromium cast iron grinding ball. The wet process mine is in the application of high carbon low alloy grinding ball.
The type of the ball is more, and because of market defects, the use of grinding ball is not according to the technological benefits to decide randomness. The main varieties of chromium high alloy cast iron. Such as Cr8, Cr12, Cr15, Cr18, Cr24, Cr26, such as low chromium cast iron Cr2 and martensitic ductile iron. Martensitic ductile iron and low chromium cast iron on the wear resistance is the same, and the difference between them in the production process. While cast high alloy has excellent anti-wear properties, the alloy is higher, and the better anti-wear properties also have a good economic benefit. Some people were a misunderstanding that high chromium for cement mill application is good, and the power plant does not adapt. Actually, the China thermal power plants have extensive use of high chromium good record. In the grinding process of the high chromium power plant, cement plant dry tons wear is only 15~50 grams, while using the high chromium not only cost savings, reduces the labor of workers and the power consumption of the mill, but also reduce the waste of resources. It should not hesitate to say that the high chromium can be called the green ball.
Forging balls and rolling balls are of the main varieties of high carbon chromium molybdenum alloy and low carbon manganese alloy. Forging ball and ball rolling process is simple, low manufacturing cost, considering the wet process the economic benefits of mine now generally use low chromium alloy grinding ball, the iron ore, copper, molybdenum mine in wear generally 500~700 grams. Improve the low chromium alloy ball hardness is the most effective way to reduce wear. Due to the production process, forged ball quality should be slightly better than the ball rolling.
If the diameter is more than 110mm, it suggests adopting a high carbon chromium molybdenum alloy forging ball, which is mainly on account of large diameter cast ball broken rate higher. The amount of carbon forged balls is in general about 1%, which chromium content is less than 2%. Low chromium cast ball hardness, in general, should be about HRC48, which should as far as possible to improve the low chromium cast iron ball hardness, in order to improve the economic benefit. The low chromium cast iron enterprises and India manufacturers’ production of grinding ball hardness should up to HRC55, and the core and surface hardness are rarely. Thermal power plant ball diameter generally does not outweigh the vertebral 60mm. Cement and mine should be carried out according to diameter ball mill lining plate diameter, surface shape, and particle size of feed. Gradation only one principle: as far as it is possible to reduce the grinding ball diameter, ball mill grinding machine is, because if rely on it to assume the crushing function, even if is only a small part, it is not appropriate.
