CALCULATION OF THE GRINDING BALLS ASSORTMENT FOR GRINDING SLAG

The calculation of the filling degree the ball mill with grinding media is a unique online service on our website. Recently our potential customers often use this service. We therefore decided to share with you the results of the calculation of the range of grinding ball assortment, which our specialists recommend on a case-by-case basis (request).

Customer specialization is the production of various mixtures for construction works.

Production parameters are as follows:

• Single-chamber ball mill 1400x7100mm.
• „Wave” lining plates
• Dry grinding method.
• Shredding material is slag (by-product or waste from metal production).
• The material size in the power of the ball mill is 1mm.
• Grinding requirement is the residue on a sieve (size of 80μn) not more than 5%.

It is necessary to remember that the hardness of the lining plates should be 10-15% higher than the hardness of the grinding balls used. Filling rate of grinding balls for this mill is 25-27 per cent of the total internal volume, i.e. approximately 13-15 tons of grinding balls.

The calculation of the average diameter of the grinding ball in the mill showed that it is necessary to use 23.74mm steel grinding balls for maximum effective grinding. Knowing that the loading rate is 13-15 tons, we have determined the range of the grinding balls assortment: 11 tons of 25 mm balls and 2 tons of 30 mm balls. Next (as the grinding balls wear out), the mill needs to be refilled with grinding balls of 30mm. The next refilling of the mill must be carried out by grinding balls of 30mm.

In addition to calculation of the grinding balls assortment, we have provided our client with recommendations how to identify basic criteria for the effective mill operation in the most clearly and easily way.