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The Vertical Mill

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The vertical mill is a kind of mill equipment, widely used in cement chemicals, coal, electricity and other fields. With the advantages of small footprint, low power consumption, small noise, simple process, layout compact, combined with crushing, drying, grinding, classifying as a whole, the vertical mill has become the preferred equipment for milling cement raw meal in the modern cement production factories.

The world's first vertical mill was developed by Loesche Company from Germany, who had the mature design already in the year of 1925. At present, the largest vertical mill - LM63．4, has a capacity of 840 TPH, with the millstone diameter of 6.3mm, the power of 5600 KW and is equiped with 4 rollers.

The current abroad manufacturers of vertical mills mainly include Loesehe Company, Fuller Company, UBE Company (LM series of vertical mill), FLS Company (Atox Mill), KHD Company (RM mill) and Pfeiffer Company (MPS series of vertical mill). The domestic manufacturers of vertical mills have a relatively small amount, whose R&D and production are still in the developing level. However, compared with international brands, the domestic brands have some unique characteristics, which are better suited to the domestic market.

Compared with other grinding equipment, the vertical mill has the following features.
1, With high efficiency of grinding. Using the principle of material bed’s crushing and squeezing, the material is rolled, cutted, impacted in the mills; the airflow in the mill can take the grinded materials out timely to avoid excessively grinded; the materials generally stay in the mill for 2-4 minutes. The vertical mill has the 165% grinding efficiency as the ball mill and the power consumption can be reduced by 30% or so.

2, With high drying efficiency. Hot air spray in from the annular gap with high wind speed; there is a large ventilation cross-section in the mill and the air resistance is very small. The materials with 8% moisture can be

 

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