Project On Dolomite Powder

The problem of low powder extraction rate of dolomite mill

Dolomite is a carbonate mineral, including calcium carbonate and magnesium carbonate. Dolomite hardness is not too high, it is a good metallurgy, dolomite powder is also used a lot, as a filler. High-pressure mill, Raymond mill, overpressure trapezoid mill, and ultra-fine mill are all common mill equipment for dolomite milling. In daily production, there may be some dolomite mills with low powder extraction rate, which is very distressing. How to solve it?

  • 1. Reasonably select the host speed and improve the host grinding force
  • Since the grinding force is mainly derived from the centrifugal force of the grinding roller, the height of the main engine directly affects the grinding force. The low speed of the drive shaft may be one of the reasons for the low powder output rate. If the power is insufficient, the drive belt is too loose or the wear is severe, the drive shaft speed will be unstable and decelerated.

    Recommendation: Considering the load carrying capacity of the main motor is a factor in improving the production efficiency of the pendulum mill. Increase the kinetic energy of the mill, adjust the belt or replace it.

  • 2. Pay attention to the humidity, viscosity, hardness, etc. of the material
  • The performance of the equipment itself is the main factor determining the level of production efficiency, but the nature of the material, such as powder moisture, viscosity, hardness, discharge particle size requirements, etc., will also affect the powder yield. Refer to the specifications and operating instructions of the equipment and operate under the corresponding requirements to achieve the best production results.


  • 3. Reasonable design of the blade device and selection of wear-resistant materials for the grinding roller ring
  • The blade device is an important device for directly shoveling the material between the grinding roller and the grinding ring. After the development and improvement of the technology, the blade of the Raymond mill is designed to be reasonable, and the material can be scooped up and the material is in the grinding roller and the grinding ring. Perform sufficient grinding between them.

    Scraper, grinding roller, grinding ring and other major grinding consumables will seriously affect the rate of powder extraction. It is necessary to select wear-resistant parts with high wear-resistant materials, such as high-chromium cast iron. The blade can not shovel the material, the grinding roller wear ring is seriously worn, and the grinding effect is not good, resulting in low powder processing rate, and the consumable parts should be replaced in time after being worn.

  • 4. Reasonably adjust the air pressure and air volume of the blower
  • Due to the physical properties of various non-metallic mineral raw materials, there are huge differences in chemical composition. For minerals with lower density such as graphite and gypsum, minerals with relatively high density (such as barite) should be adjusted when adjusting wind pressure and air volume. Iron ore, etc.) should be small and make it properly adjusted. If it is too large, it will easily make the coarse particles not be well graded and mixed into the finished product when sorted by a classifier. If the product is too small, the host will be too small. Inside, it is easy to block the phenomenon, so that the machine can not operate normally.

  • 5. Unblock the pipe and seal it well
  • If the mill conveys the air duct blockage, the powder can not be transported normally, which will cause the powder output to be low or even no powder. When the treatment is solved, the material in the pipeline should be shut down and the material should be restarted.

    Suggestion: The ultrafine powder contained in the material has a large agglomeration effect, and the loose specific gravity is small, and the volume is large (the 800-mesh product with the same weight is nearly twice as large as the 325 mesh product), and it is easy to stick to the pipe wall and the material. On the wall of the warehouse, it is not easy to fall, so the inner wall of the pipe and silo should be as smooth as possible. It is best to lining the galvanized or stainless steel plate. The discharge taper of the silo should be as small as possible. It is best to add a wall vibrator.

    In addition to blockage, the pipeline also has an effect on the sealing. Poor pipe sealing will result in increased dust, negative pressure imbalance, low powder delivery rate, and the sealing pipe must be in place before production.

    Suggestion: The powder locker of the Raymond mill production line is not adjusted to the correct state, resulting in poor sealing and powder suction, ensuring that the locker, return air valve and other valves on the pipeline should be in good condition. Working status.

  • 6. Do a good job in equipment lubrication
  • Another reason that affects the speed of the main machine of the mill may be that the grinding teeth become dull. Therefore, it is necessary to check the gearing parts such as grinding teeth and prepare for lubrication.