Vertical Roller Mill (VRM) is a grinding equipment widely used in the industrial field. It is mainly used for efficient crushing and grinding of solid materials such as ore, cement raw materials, coal powder, slag, etc. Its core feature is the use of a vertical structure, which achieves material crushing through the rolling action of the grinding roller and the rotating grinding disc, and has the advantages of energy saving, high efficiency, and environmental protection.
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Vertical Roller Mill (VRM) is an industrial grinding equipment with a vertical layout. Through the rolling action between the grinding roller and the rotating grinding disc, solid materials such as ore, cement raw materials, slag, etc., are crushed to the required fineness. Its core principle is "material layer grinding". Combined with airflow sorting technology, it has the characteristics of high efficiency and energy saving, strong adaptability, and good environmental protection. It is widely used in cement, metallurgy, power, and chemical industries.
The structural design of the vertical roller mill revolves around efficient grinding and modular maintenance. The main components and their characteristics are as follows:
• Vertical arrangement: The grinding disc rotates horizontally, and the grinding rollers are distributed vertically and symmetrically. The vertical structure reduces the floor space and is suitable for plants with limited space.
• Integrated shell: The overall sealing design reduces dust leakage while integrating the airflow channel and material conveying path to improve the system's tightness.
• Grinding Table:
A horizontally rotating circular disk with a corrugated or grooved surface to enhance the shear force on the material.
The material is made of high-chromium cast iron or composite wear-resistant material to extend the service life.
• Grinding Rollers:
Multiple rollers (usually 2 to 6) are symmetrically distributed around the center of the grinding table, and pressure is applied by a hydraulic system or spring.
The roller surface is welded with a wear-resistant layer or inlaid with hard alloy to adapt to the grinding of high-hardness materials.
• Pressure regulation system:
The hydraulic device dynamically adjusts the grinding pressure of the grinding roller on the material to balance the grinding efficiency and equipment wear.
Cement grinding production line
Vertical Roller Mill
The VRM is grinding material
Vertical mill structure diagram
Vertical roller mill (VRM) can process a variety of solid materials with its high-efficiency grinding, strong adaptability, energy saving, and environmental protection, covering cement, metallurgy, power, chemical industry, and other industrial fields.
• Cement raw materials: mixed raw materials such as limestone, clay, sandstone, iron ore, etc., ground to 80~100μm for calcining clinker.
• Cement clinker: mixed with gypsum and ground to make finished cement (fineness of about 300-450m²/kg specific surface area).
• Slag/fly ash: blast furnace slag, steel slag, fly ash, and other industrial waste residues, ground into micro powder (specific surface area ≥420m²/kg), as a cement admixture or concrete additive.
• Metal ore: iron ore, copper ore, nickel ore, etc., ground to a fineness suitable for mineral processing or smelting.
• Metallurgical slag: blast furnace slag, steel slag, copper slag, etc., are used for resource utilization through grinding (such as slag powder for building materials).
• Metal oxides: aluminum oxide, zinc oxide, etc., are used to prepare fine chemical raw materials or refractory materials.
• Calcium carbonate: heavy calcium (calcite), light calcium (limestone), ground to 600~2500 mesh, used in plastics, coatings, papermaking, and other industries.
• Quartz/silica sand: Grind to high-purity silicon powder (used for photovoltaic glass, electronic packaging materials).
• Benzonite/kaolin: Prepare drilling mud, ceramic raw materials or catalyst carriers.
Saving 40% -50% power consumption compared to ball mill. the grinding roller grinding table does not direct contact during the grinding process, so the noise of the whole system is low.
It integrates crushing, drying, grinding, powder selection, and conveying into one, with a simple process flow and compact layout； Small footprint, can be arranged in the open air, low construction cost.
The product has a narrow particle size distribution, uniform particle shape, and good fluidity. Grinding roller bearings are lubricated with forced thin oil, which longer bearing life.
Adopt a fully automatic control system, that can realize remote control, easy to operate.
The vertical rolling mill has two pairs of grinding rollers. Each pair of the roller is composed of two narrow rollers mounted on the same axis and can rotate at different speeds. The motor driving reducer makes the grinding plate rotate. The raw material is sent to the center of the rotating grinding plate by the locking air feeding equipment. Under the action of centrifugal force, the material moves to the surrounding area of the grinding plate and enters the grinding roller slide. Under the action of roller pressure, the material is crushed by extrusion, grinding, and shearing. At the same time, the ground material is flowed by hot air upward from the wind ring. The coarse granularity will be back to the mill to regrind and suspended material will be dried. Fine powder following hot air is taken to the classifier system. Qualified powder enters the powder collector with airflow as finished products. Unqualified powder falls to be regrinded with new feeding material together. This cycle is continuous to complete the whole grinding process.
| Model | SRM1300 | SRM1500 | SRM1700 | SRM1900 | SRM2200 |
|---|---|---|---|---|---|
| Grinding Table dia.(mm) | 1300 | 1500 | 1700 | 1900 | 2200 |
| Max. Feeding Size(mm) | 38 | 38 | 38 | 38 | 38 |
| Discharge Size (um) | 212-45 | 212-45 | 212-45 | 212-45 | 212-45 |
| Discharge Size(mesh) | 70-325 | 70-325 | 70-325 | 70-325 | 70-325 |
| Air-in Tempreture(℃) | ≤350 | ≤350 | ≤350 | ≤350 | ≤350 |
| Air-out Tempreture(℃) | 70-95 | 70-95 | 70-95 | 70-95 | 70-95 |
| Max Input Material Moisture(%) | 4 | 4 | 4 | 4 | 4 |
| Final Moisture(%) | ≤1 | ≤1 | ≤1 | ≤1 | ≤1 |
| Capacity(t/h) | 10-28 | 13-38 | 18-68 | 23-85 | 36-135 |
| Power(kw) | 132-200 | 220-285 | 315-400 | 450-600 | 600-750 |
Excessive vibration in a vertical roller mill usually comes from four sources: an uneven material bed (too thin or too thick feed layer), uneven wear on the grinding roller or grinding table, hard foreign objects entering the grinding zone, and loose foundation anchor bolts or failed shock absorbers. Check the feed rate and material bed first, then inspect roller and table wear, and strengthen iron removal before the mill.
Product fineness is controlled mainly by the classifier. Increase the classifier speed to improve fine-powder separation, confirm the system air volume and pressure are matched so coarse particles are not carried out, adjust grinding roller pressure within a reasonable range, and check the classifier blades for wear or deformation. This SRM series is adjustable from 212 to 45 μm (70-325 mesh).
High roller bearing temperature normally points to one of four causes: poor lubrication, a failed seal letting dust into the bearing, excessive load on the roller, or a blocked cooling water circuit or oil cooler. Check the quantity and quality of the lubricating oil first, then clean or replace the seal, bring roller pressure back into range, and clear the cooling circuit.
A sudden output drop usually traces back to the feeding system (blockage or low feed rate), wear on the grinding table or grinding rollers, abnormal wind-ring air speed caused by a blocked wind ring or a fan fault, or a change in material moisture and hardness. Check the feed path and wind ring first, then the wear parts, then re-tune the process parameters to the new material.
Powder leakage is normally a sealing or negative-pressure problem. The usual causes are worn roller seals or shell flange seals, insufficient fan negative pressure that lets the system run under positive pressure, cracks in the mill shell, and an over-high feed rate pushing dust out with the airflow. Replace worn seals, restore correct system negative pressure, repair shell cracks, and control feed rate.
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