Vertical roller cement mill

With the continual increasing demand for portland cement and constant pressure for reduced energy consumption, producers are exploring a wide variety of cost-saving manufacturing options. One option is vertical roller mill technology for finish grinding.

Vertical roller mill present a compact and efficient grinding method. Clinker and gypsum is ground on a rotating table that passes under large rollers. Material is forced off the table by centrifugal force, where it is then swept up into an airstream to a classifier immediately above. Just as with a ball mill, material that is too coarse is returned to the table for additional grinding while material that is fine enough is collected as product. The compact design of a vertical roller mill allows it to dry, grind, and classify, all within one piece of equipment and all in a relatively compact space.

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Vertical roller cement mill benefits:

  1. Power consumption savings;

    The single largest energy consumption point in the manufacture of portland cement is in the finish milling process. A reduction in power consumption here makes a dramatic impact on the plant’s overall power consumption. The vertical roller cement mill makes significant power reductions possible by more efficient grinding.

  2. Consistent product quality;

    Vertical roller cement mill create a particle size distribution with a sharper cut in comparison to cement milled in a traditional ball mill. That is, the particle size distribution is in a narrower band. This sharper cut means potentially less variability in product consistency and, hence, more predictable results in product performance.

  3. Process Simplification;

    By changing various vertical roller mill operating parameters, significant adjustments in the particle size distribution, retention time, and fineness of the finished cement can be achieved. This can help with plant operations as production is switched between different cement types.

    In light of these issues, vertical roller mills are becoming a popular choice for both existing ball mill conversion and new mill construction. From 2000-2002, 56% of the mill orders (comprising both raw mills and finish mills) came from vertical mills – compared to 32% for ball mills. Clearly vertical roller mills are an increasingly attractive option for improving production, lowering energy costs, and maintaining product quality.

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