Vertical roller mill shortcomings Profile

Not suitable for grinding hard and abrasive materials, service life is shorter, more frequent maintenance. And it's expensive wear parts than a ball mill, a ball mill, but they replace, hoist, separator and other equipment compared to the total amount of maintenance, still seems simple maintenance, easy and small workload.
Vertical roller mill is relatively milling, the high energy efficiency, it is preferred grinding system mainly vertical roller mill, but the vertical roller mill product fineness too are together, there is no reasonable particle gradation, which is to limit the vertical roller mill mainly applied to clinker grinding.
In order to ensure the early strength of concrete, cement particles 0-3 & micro; m particles should be up to about 10%, while the guarantee late strength of concrete, 3-30 & micro; m of cement particles more than 70% is required. Compared with ball mill vertical roller mill, cement although 28 days of the same intensity, due to the narrow particle size distribution range, 3-30 & micro; m particles up to 82%, 0 ~ 3 & micro; m particles of about 6 percent, resulting in its low early strength water demand large, easy to agglomerate and false condensate, and there are cracks, the workability of the concrete does not meet the requirements.
Low energy utilization mill currently being replaced vertical roller mill, roller presses and other equipment trend, but there are ball mill, "spherical particle morphology, help cement raw meal calcination and hydration hardening" of the unique advantages This is still the most chosen clinker grinding mill of the main reasons.