Improve Vertical Roller Mill Output

Improve Vertical Roller Mill Output

How to improve the output of Vertical Roller Mill has always been the concern of users. Due to the lack of attention to some small details, the output of the vertical mill may be reduced. The most obvious performance is that the vertical grinding roller and the disc liner are worn after a period of use. Invisible is equivalent to increasing the height of the retaining ring, increasing the thickness of the material layer, increasing the load of the main motor, and limiting the output, which has a great influence on the working condition of the mill. In the case of not changing the roll skin and the disc liner, the method of reducing the height of the retaining ring according to the amount of wear can restore the mill capacity in a short time.

First, the analysis of the reasons of the vertical roller mill

  1. Grinding rolls and grinding discs are seriously worn. The vertical roller mill disc liner has not been replaced since it was put into production, and its surface wear is serious. After measurement, the wear of the disc liner reaches 20mm, the thickness of the material layer increases during operation, the average thickness is 145mm, the main motor current is high, and the output is limited.
  2. The height of the retaining ring is high. After measuring the height of the retaining ring is 105mm, the wear of the disc liner is up to 20mm, which is equivalent to increasing the height of the retaining ring. The difficult-to-grind material is difficult to be thrown out in time, the thickness of the layer is increased, and the current of the main motor is increased.
  3. The floor of the wind chamber is seriously worn. Due to the long-term scouring of the materials in the wind chamber, the bottom plate on the outer side of the squeegee is more severely worn, forming a bowl shape, and the phenomenon of wear and leakage has appeared locally. The material is easy to accumulate, the gap between the squeegee and the bottom plate becomes larger, the resistance increases when the material is scraped, and the current of the mill rises.
Improve Vertical Roller Mill Output

Second, vertical roller mill renovation measures

  1. Reduce the height of the retaining ring. Under the premise of not changing the roll skin and the disc liner, the height of the retaining ring is adjusted from 105mm to 85mm according to the wear amount of the disc liner, so that the hard-to-grind material can be removed in time and the thickness of the layer is reduced.
  2. Repair the bottom plate. After observation and measurement, the maximum gap between the outer side of the scraper and the bottom plate is 150mm, and the maximum gap between the inner side and the bottom plate is 80mm. It can be seen that the severe wear of the floor of the wind chamber is mainly between the center line of the scraper and the casing (see Figure 1).
  3. To this end, we use a steel plate that is consistent with the curvature of the bottom plate to cover the weld, keep the bottom plate flat, and adjust the scraper to make the gap with the bottom plate reach a reasonable range.

Application of vertical roller mill in processing of heavy calcium powder

  1. Heavy calcium powder rubber for rubber industry - heavy calcium carbonate powder for rubber: 400 mesh, whiteness: 93%, calcium carbonate: 96%;
  2. Heavy calcium value for plastics industry: plastic-plastic masterbatch, masterbatch with heavy calcium carbonate powder (heavy calcium powder) 400 mesh;
  3. the paint industry with heavy calcium powder: paint - latex paint with heavy calcium carbonate (heavy calcium powder) 800 mesh or 1000 mesh, whiteness: 95%, calcium carbonate: 96%) calcium carbonate in the paint industry Larger, for example, in a thick paint, the amount is more than 30%;
  4. Heavy calcium powder for waterborne coating industry: 800 g or 1000 mesh of heavy calcium carbonate (heavy calcium powder) for waterborne coating, whiteness: 95%, calcium carbonate: 96%,) The use of calcium carbonate in the waterborne coating industry is more For a wide range, the coating can be made without sedimentation, easy to disperse, good gloss, etc., in the amount of waterborne coating is 20-60%;
  5. Heavy calcium powder for paper industry: heavy calcium carbonate for papermaking (heavy calcium powder): 325 mesh, whiteness requirement: 95%, calcium carbonate content: 98% calcium carbonate plays an important role in the paper industry. Strength and whiteness, and low cost;
  6. Heavy calcium powder for construction industry (dry mortar, concrete): 325 mesh of heavy calcium carbonate (heavy calcium powder) for dry mortar, whiteness requirement: 95%, calcium carbonate content: 98%) Calcium carbonate in the construction industry The concrete plays an important role. It not only reduces the production cost, but also increases the toughness and strength of the product.
  7. Fire ceiling industry heavy calcium powder: fireproof ceiling with heavy calcium carbonate (heavy calcium powder): 600 mesh, whiteness requirements: 95%, calcium carbonate content: 98.5%) calcium carbonate in the fireproof ceiling production process needs to be used , can improve the whiteness and brightness of the product, and the fire performance will also increase;
  8. Heavy calcium powder for artificial marble industry: heavy calcium carbonate for artificial marble (heavy calcium powder): 325 mesh, whiteness requirement: 95%, calcium carbonate content: 98.5%, pure and impurity-free) Calcium carbonate is widely used. Produced in artificial marble;
  9. Heavy calcium powder for floor drilling industry: heavy calcium carbonate for floor drilling (heavy calcium powder): 400 mesh, whiteness requirement: 95%, calcium carbonate content: 98.5%, pure and impurity-free) Calcium carbonate can be used on the floor. Drilling industry, used to increase the whiteness and tension of products, improve product toughness and reduce production costs.

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