CRLM Vertical Mill

CRLM Vertical Mill Information Introduction

The Vertical Mill is a high-efficiency, intensive grinding equipment widely used in large-scale mining, cement, building materials, power, and metallurgy industries. It integrates multiple functions including crushing, drying, grinding, classification, and conveying into one unit, suitable for various materials with Mohs hardness ≤7.

The CRLM Vertical Mill is a domestic vertical mill with complete independent intellectual property rights, developed and manufactured by Cronus Machinery based on the introduction of advanced foreign vertical roller mill technology (Germany Pfeiffer technology), combining the advantages of LM vertical mill and MPS vertical mill. Adopting vertical roller mill design, the grinding rollers are positioned above the grinding table, applying pressure through the hydraulic system without direct contact with the grinding table, resulting in low noise, low wear, and effectively reducing metal contamination. The built-in powerful drying system can directly process sticky and wet materials with moisture content ≤15%. Since the first unit was introduced in 1989, over 3,000 units have been stably operating across various industries.

Features and Advantages of CRLM Vertical Mill

The Vertical Mill mainly consists of grinding, dynamic classification, drying, transmission, and hydraulic systems. With vertical roller mill structure, it integrates multiple functions including crushing, drying, grinding, classification, and conveying into one unit, featuring small footprint, strong drying capacity, low operating noise, and precisely controllable finished product fineness.

Structural Features

Grinding System: Composed of grinding table, grinding rollers, etc. The rotating grinding table receives material to form a material bed. The grinding rollers are positioned above the grinding table, applying pressure through the hydraulic system for rolling and crushing.

Classification System: Dynamic classification system. The high-speed rotating rotor generates a centrifugal force field. Qualified fine powder is selected with the airflow, while coarse powder returns to the grinding table for regrinding. Finished product fineness is controlled by adjusting the rotor speed.

Drying System: Hot air introduced from the bottom enters the mill through the air ring, efficiently drying the material while lifting it. The in-mill water spray device stabilizes the material bed and controls grinding temperature through atomized water.

Transmission System: Composed of main motor and reducer. The main motor provides primary power, and the reducer converts the motor power into low-speed rolling force driving the grinding table.

Hydraulic System: The hydraulic station provides grinding force through roller pressure cylinders to determine grinding effect. Independent maintenance hydraulic cylinders are used for roller lifting before startup and roller turning during maintenance, ensuring equipment operation and maintenance safety.

Performance Advantages

High Integration: Integrates multiple functions including crushing, drying, grinding, classification, and conveying into one unit, featuring high automation, small footprint, and convenient maintenance.

Roller Grinding Structure: Grinding rollers do not directly contact the grinding table, with a material layer in between, resulting in low noise, low wear, and effectively reducing metal contamination.

High-Efficiency Drying: Built-in powerful drying system can directly process sticky and wet materials with moisture content ≤15%, requiring no additional drying equipment.

Significant Energy Saving: Large feed particle size, up to 3%~5% of grinding roller diameter. Adopts material bed grinding principle, with energy consumption reduced by 30%~50% compared to ball mills.

Precise Control: Finished product fineness is arbitrarily adjustable within the range of 80~600 mesh, with 325 mesh sieve residue ≤10%, stable output, and uniform particle size distribution.

Process Flow of CRLM Vertical Mill

Raw Material → Vertical Mill → Material Bed Grinding → Simultaneous Drying → Pneumatic Conveying → Dynamic Classification → Qualified Fine Powder → Dust Collector → Finished Product Packaging

Feeding and Material Bed Grinding

Raw material meeting the feed requirement (particle size ≤60mm, moisture content ≤15%) falls through the feed inlet onto the center of the rotating grinding table. Under centrifugal force, it is thrown into the rolling zone between the grinding rollers and the grinding table. Under the tremendous rolling force applied by the hydraulic system, the material is subjected to compression and shearing from the grinding rollers, being efficiently crushed on the material bed.

Simultaneous Drying and Pneumatic Conveying

High-temperature hot air introduced from the lower housing penetrates the material layer during the crushing process. After crushing, the specific surface area of the material increases dramatically, undergoing full and efficient heat exchange with the hot air, with moisture being instantly evaporated, achieving simultaneous grinding and drying. The dried fine powder is carried by high-speed upward airflow, conveyed through the upper housing, and enters the classification stage.

Dynamic Classification and Internal Circulation

The powder rising with the airflow is precisely classified at the high-speed rotating classification impeller. Qualified fine powder meeting the particle size requirement passes through with the airflow and becomes finished product. Unqualified coarse powder is thrown by the impeller to the surrounding housing and falls back to the grinding table for regrinding, forming an internal circulation, achieving large-scale processing of 80~600 mesh powder with 325 mesh sieve residue ≤10%.

Finished Product Collection and Exhaust Gas Treatment

Qualified fine powder enters the dust collection system (single-stage or multi-stage dust collection system) with the airflow for gas-solid separation. The finished fine powder is collected, and the purified gas is discharged by the fan.

Single-stage Dust Collection System: The dust collection device used is an electrostatic precipitator or bag filter. The mill exhaust gas directly enters the dust collector. The system configuration is simple, effectively saving fan energy consumption, with low investment and maintenance costs.

Multi-stage Dust Collection System: A cyclone collector is used for primary collection, with an electrostatic precipitator or bag filter as secondary collection equipment. This reduces the system operating negative pressure, decreases equipment wear, and improves the total product collection rate, especially suitable for recovering high-value materials.

Application Scenarios of CRLM Vertical Mill

Technical Parameters of CRLM Vertical Mill

Frequently Asked Questions about Vertical Mills

How to choose the right Vertical Mill?

Vertical Mill: Suitable for scenarios with uniform raw material particle size, relatively low moisture content (≤15%), and stable conditions. Focused on producing high-value-added products such as high-activity slag powder, high-grade cement, and fine non-metallic powder (e.g., calcined clay, limestone powder).

Coarse Powder Vertical Mill: Suitable for situations with large raw material particle size, relatively high moisture content (≤25%), and complex composition. Can be directly used for producing intermediates or coarse powder with low fineness requirements such as cement raw meal, road construction slag, and metallurgical sintering materials.

Ultrafine Vertical Mill: Suitable for fine processing of raw materials with high purity and easy-to-cleavage crystal structure. Specially designed for producing functional mineral powders with narrow particle size distribution and high product purity such as marble, calcium carbonate, kaolin, and barite. It is the core production equipment for high-end fillers in industries such as coatings, plastics, and papermaking.

What is the difference between Vertical Mill and Raymond Mill?

Vertical Mill: Larger processing capacity and feed particle size, strong drying capacity, but higher investment cost. Suitable for processing sticky and wet materials, as well as large-scale, high-output powder production.

Raymond Mill: Lower investment, suitable for small to medium-scale production. For large-scale production, a systematically pre-designed multi-unit parallel operation scheme is required.

How to control the product fineness of Vertical Mill?

Product fineness is mainly controlled by adjusting the classifier speed, system airflow, and in-mill water spray volume. The higher the speed, the finer the product; the larger the airflow, the coarser the product.

What causes the "saturated grinding" phenomenon in Vertical Mill?

"Saturated grinding" is a phenomenon of increased mill load and abnormal vibration caused by excessive feeding, overly wet material, or insufficient system airflow. It requires immediate reduction or cessation of feeding, increase of system airflow. If ineffective, the mill needs to be stopped for material cleaning and operating parameters need to be optimized.