Vertical Roller Mill for Cement Factory Process Flow

The two-compartment ball mill operating in a closed circuit with a high efficiency separator is thus still the most preferred arrangement for new cement grinding installations although the vertical roller mill now has emerged as a viable alternative to the ball mill system and has increased its share of the market for cement mills over the last decade. There are a number of explanations for this situation, rela ted to issues like cost and ease of operation, cost of installation, cost and ease of maintenance, product quality, versatility, etc. The following presents a comparison of the two mill systems with reference to these issues.

Vertical Roller Mill for Cement Factory Process Flow

A vertical roller mill is a very versatile mill capable of grinding a wide range of products. The ball mill has proved suitable for grinding not only pure slag and Ordinary Portland Cement, but also blended cements with a wide range of additives such as slag, pozzolana, limestone and fly ash. Several ball mills grind two or more products alternately. Heat will be generated and the cement will be heated up during the grinding process. The temperature of the cement leaving the mill will be dependent on the temperature of the materials fed to the mill and on features of the mill and the grinding process. It will typically be in the range from 90 to 120 °C. At this temperature level the water of crystallisation of the gypsum added to the mill will be partially lost i.e. the gypsum will be partly dehydrated.

Ball Mill For Cement Grinding

In general, ball mill grinding systems are fully enclosed in a building regardless of geographic location or predominant
weather conditions. The use of a building has as much to do with noise abatement as with protecting the equipment.Shifting from one product type to another is easy and with only a very short transition period. A decisive advantage of the vertical roller mill compared to a ball mill is its ability to dry feed materials, such as slag, with a high water content. Furthermore, the operational parameters of a vertical roller mill are easily adapted to suit alternative products

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