Abstract
Ball mills for fine grinding cement clinker and additives are widely used around the world. To improve the efficiency of a ball grinding the ball mills are transferred in closed circuit with air-separators of various designs. In the article the analysis of existing grinding circuits on the basis of closed circuit ball mills made. Introduced a summary measure that allows to evaluate the performance of the grinding system according to various criterias. The conclusion about the prospects of data systems grinding when grinding to ordinary cement, in comparison with the grinding systems based on other principles of grinding.
Highlights
Technological system of grinding (TSG) in a closed circuit on the basis of the ball mill (BM), worldwide widespread [1,2,3,4,5,6,7,8]
Replacement of outdated disign of the separator for ball mill 4×13.5 m allowed due to the optimization of the grain composition with constant brand of cement (CEM I 42.5 N) is to reduce the specific surface of the finished product with a 4670 to 3800 cm2pg, which in turn allowed for a constant power consumption to improve the performance of the grinding unit 57 to 86 tph while reducing the specific consumption of electricity from 51.9 to 37 kWhpt
On ball mill of size 4×12 m with the installation of a separate clean air flow when the finished product with a specific surface of 3400...3500 cm2pg capacity was increased from 76 to 100 tph, and q decreased from 41.2 to 32.4 kWhpt
Summary
Technological system of grinding (TSG) in a closed circuit on the basis of the ball mill (BM), worldwide widespread [1,2,3,4,5,6,7,8]. When transferring to closed circuit а mill size 2.6×13 m at a constant quality cement (3000 cm2pg) capacity grinding unit was increased from 25 to 38 tph while reducing the specific consumption of electricity from 41.6 to 29.3 kWhpt.
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