Avoid size causing for faulty operation

Avoid size causing for faulty operation

Probably the most common cause for faulty operation and complaints has been due to the size of grinding media. It is strongly recommended that the smallest feasible grinding media be used in all cases. The optimum size of media should not change with Mill size. If the laboratory Pebble or small Ball successfully grinds a sample batch in a lab Mill, the same size grinding media will do the best job in a production Mill whether the Mill is one foot or eight feet in diameter.
Small grinding media are recommended because:
1.They provide many more grinding contacts per revolution than larger media. This results in much quicker grinding action.
2.They provide smaller voids, limiting the size of particles or agglomerates which can exist there.
3.They do not create excessive energy which cannot be utilized. Oversized grinding media frequently develop more grinding energy than is needed for the job. This excess merely builds up heat and wears down the media and lining, introducing contamination in the batch. Using an extremely large grinding media is somewhat like using a sledgehammer to drive in a carpet tack.
The chief disadvantage of the smallest size grinding media is that discharging takes somewhat longer due to increased surface tension in the smaller voids. Almost invariably, however, the reduced grinding time realized by smaller media more that offsets this disadvantage. Slight air pressure may be used to assist in more rapid discharge.
Using extremely small media, with their greater surface area for the material to adhere to, may yield a smaller initial batch. Subsequent batches will be of normal size, however.
When steel balls are used, the optimum sizes we have usually been recommending. However, many operators are now using media as small as in production mills and find these extremely advantageous where exceptionally fine grinds are required. Generally, the viscosities must be slightly lower for the small size balls than we would recommend for the more popular and 5/8 sizes.

 

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