Dolomite Grinding Machine / Vertical Roller Mill For Processing 200-1250 Mesh Ultrafine Powder

Dolomite Grinding Machine Manufacturer / Vertical Roller Mill For Processing 200-1250 Mesh Ultrafine Powder

1, Introduction to Vertical Dolomite Mill

Dolomite grinding machine - Dolomite grinding equipment can not only process mica, but also process ultrafine powders of non flammable and explosive brittle materials with medium to low hardness and Mohs hardness ≤ 6 levels, such as calcite, chalk, limestone, dolomite, carbon black, kaolin, bentonite, talcum, mica, magnesite, illite, pyrophyllite, vermiculite, sepiolite, attapulgite, rectorite, diatomaceous earth, barite, gypsum, alum, etc More than 100 types of materials, including graphite, fluorite, phosphate rock, potassium ore, pumice, etc

2,Working principle: The electric motor drives the grinding disc to rotate through a reducer, and the material falls into the center of the grinding disc from the feeding port. At the same time, hot air enters the grinding chamber from the air inlet. Under the action of centrifugal force, the material moves towards the edge of the grinding disc and is crushed by the grinding roller when passing through the circular groove on the grinding disc. The crushed material is carried up by the high-speed airflow at the edge of the grinding disc, and large particles directly fall onto the grinding disc for re grinding. When the material in the airflow passes through the dynamic and static separator, under the action of the rotating rotor, the coarse powder falls onto the grinding disc for re grinding, and qualified fine powder is discharged with the airflow, Collect in the powder collection device, which is the product. Materials containing moisture are dried during contact with hot gases to achieve the required product moisture.

3,Advantages of vertical mills:
1. The grinding efficiency is high, and the vertical mill uses grinding rollers and material beds to crush and grind materials. The energy consumption is low, and the power consumption of the grinding system is reduced by 20-30% compared to the ball milling system. As the humidity of the raw materials increases, the energy-saving effect is more significant.
2. Strong drying ability, vertical mills use gas conveying materials, and can control the inlet air temperature when grinding materials with high moisture content, so that the product reaches the final water powder. In the vertical mill, materials with a moisture content of up to 12-15% can be dried. Even for drying ball mills, only materials with a moisture content of 3-4% can be dried.
3. The particle size of the incoming material is large, up to about 5% of the diameter of the grinding roller, generally ranging from 40-100 millimeters. Therefore, large and medium-sized vertical mills can eliminate secondary crushing.
4. The product has stable chemical composition and uniform particle grading. Due to the fact that the material stays in the vertical mill for only 2-3 minutes, while the ball mill lasts 15-20 minutes, the chemical composition of the product can be quickly measured and corrected when using vertical mill powder. The fluctuation of the product's chemical composition is small, which is conducive to homogenization. In addition, qualified products in the vertical mill can be separated in a timely manner, avoiding repeated grinding, and the particle size of the products is uniform and consistent, which is conducive to calcination.
5. The process flow is simple, the building area is small, and the occupied space is small. There is a separator inside the vertical mill, and there is no need for a powder concentrator or elevator. The dust containing gas from the mill can be directly collected into the dust collector as a product. Therefore, the process is simple, the layout is compact, and the building area is only 70% of the ball mill system. The building space is about 50-60% of the ball mill.
6. Low noise, less dust, clean operating environment, vertical mill in operation, without direct contact between the grinding roller and the grinding disc, without the collision of steel balls and the impact sound of steel balls hitting the lining plate during ball milling. The ancient noise is low, about 20-25 decibels lower than that of ball milling. In addition, the vertical mill is sealed as a whole, and the system operates under negative pressure, resulting in less dust and a clean environment that meets environmental requirements.
7. Low metal loss, long service life of the lining plate and grinding roller, high utilization rate. Due to the lack of direct contact and collision between metal and metal during the operation of the vertical mill, the wear of accessories is minimal and the service life is long. The metal wear per unit product is generally 5-10 grams/ton. For medium hardness materials, the service life of the grinding roller and lining plate can reach about 8000 hours.

Technical Parameters Table

Re:The data based on Mohs'hardness 3-4 material
The product fineness can reach 10 um(1250 meshes)