dry cement ball mill

    dry cement ball mill 

What is cement mill?

A cement mill  is the equipment used to grind the hard, nodular clinker from the cement kiln into the fine grey powder that is cement.

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How cement mill work?

A cement mill is a horizontal cylinder partly filled with steel balls (or occasionally other shapes) that rotates on its axis, imparting a tumbling and cascading action to the balls. Material fed through the mill is crushed by impact and ground by attrition between the balls. The grinding media are usually made of high-chromium steel.

Cement mill structure introduction:

Cement mill is usually divided into at least two chambers,(Depends upon feed input size presently mill installed with Roller Press are mostly single chambered), allowing the use of different sizes of grinding media. Large balls are used at the inlet, to crush clinker nodules (which can be over 25 mm in diameter). Ball diameter here is in the range 60–80 mm. In a two-chamber cement mill, the media in the second chamber are typically in the range 15–40 mm, although media down to 5 mm are sometimes encountered. As a general rule, the size of media has to match the size of material being ground: large media can't produce the ultra-fine particles required in the finished cement, but small media can't break large clinker particles.

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Cement mill technical parameter:

Cement mill closed-circuit system:

The efficiency of the early stages of grinding in a cement mill is much greater than that for formation of ultra-fine particles, so cement mills operate most efficiently by making a coarse product, the fine fractions of this then being separated, and the coarse part being returned to the cement mill inlet. The proportion of the mill-exit material returned to the inlet may vary from 10-30% when ordinary cement is being ground, to 85-95% for extremely fine cement products.

cement mill closed-circuit system:

It is important for system efficiency that the minimum amount of material of finished-product fineness is returned to the inlet. Modern separators are capable of making a very precise size "cut" and contribute significantly to the reduction of energy consumption, and have the additional advantage that they cool both the product and the returned material, thus minimizing overheating.

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Cement mill cool:

A current of air is passed through the cement mill. This helps keep the cement mill cool, and sweeps out evaporated moisture which would otherwise cause hydration and disrupt material flow. The dusty exhaust air is cleaned, usually with bag filters.

Cement mill capacity:

The cement mills on a cement plant are usually sized for a clinker consumption considerably greater than the output of the plant's kilns.

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Cement production process

The whole production process of cement is generally as follows:

Cement Crusher and homogenizing-- Preparation of raw material -- Raw material homogenization -- Preheat decomposition -- The burning of cement clinker -- Cement equipment (Cement Mill or Vertical Roller Mill)-- Cement Packaging

Cement mill advantages:

China cement mills have been honored as famous brand of China Building material in machinery industry, national top brand product, fixed-point production of national building materials, etc. The Cement mill price is also lower than the foreign countries.