Ultrafine Vertical Mill

Ultrafine Vertical Mill Introduction

The Ultrafine Vertical Mill is a high-precision equipment upgraded from conventional vertical mills for high-end powder industries. It solves common drawbacks of ball mills and jet mills with high energy consumption, ring roller mills with low output, and Raymond mills with insufficient fineness. It provides a complete solution for large-scale industrial production of ultrafine powder. Equipped with high-precision turbo classifier and advanced secondary classification system, the mill enables precise particle size control, stably producing 400~2500 mesh ultrafine powder with narrow particle size distribution and high purity (D97<2500 mesh, particles below 2μm account for >70%). It is widely used in high-end industries such as coatings, plastics, papermaking, ink, and new electronic materials.

Features & Advantages of Ultrafine Vertical Mill

Structural Features

Grinding System: The curved grinding table and grinding rollers are custom-designed. Material is crushed by compression and shear force within material bed for uniform grinding and ultrafine pulverization.

Classification System: Turbo classifier adopts combined static & dynamic design. Infinitely variable speed impeller (rotor) and fixed guide vanes (stator) realize high-precision separation, and secondary classification system can be optionally extended.

Drying System: Integrated high-efficiency drying module. Hot air is fed during grinding, realizing synchronous drying and pulverization in one machine to simplify process flow.

Transmission System: Composed of main motor and precision reducer, delivering stable and reliable drive power for grinding table to maintain stable material bed.

Hydraulic System: Better control accuracy, pressure range and response stability than ordinary vertical mills, coordinating with feeding and classification systems.

Performance Advantages

Concentrated Particle Size: Material bed grinding principle plus high-precision turbo classification reduce coarse particles and over-grinding, delivering powder with narrow particle distribution.

Ultrafine Classification: Stably produces 400~2500 mesh ultrafine powder with controllable fineness (D97<5μm, particles below 2μm >70%).

Precise Grading: Optional secondary classification system not only generates high-quality powder with tighter particle distribution, but also outputs two different fineness grades simultaneously.

High Integration: Combines crushing, grinding, classification and drying in one unit. Drying and grinding run concurrently, cutting energy consumption by roughly 60% compared with traditional ball mill systems.

Low Noise & Eco-friendly: Rollers never directly touch the grinding table, minimizing wear and noise. Iron contamination is greatly reduced to guarantee high purity and whiteness of powder.

Process Flow of Ultrafine Vertical Mill

Material Bed Grinding

Raw materials meeting feed requirements (feed size ≤30mm, moisture ≤15%) are continuously and evenly fed into the Ultrafine Vertical Mill via air-locked feeder. Driven by high-speed rotating grinding table, materials move toward table edge. Large lumps are first broken by scrapers and then enter the grinding zone between roller and table. Under stable pressure from hydraulic system, the material bed undergoes repeated compression and shear to achieve uniform ultrafine pulverization.

Synchronous Drying

Specific surface area surges after material crushing. Hot air introduced at mill bottom penetrates the material bed for sufficient and efficient heat exchange, instantly evaporating moisture and realizing grinding and drying at the same time.

Precise Classification

Dried ultrafine powder is carried by upward airflow to the top turbo classifier. The turbo classification system uses static-dynamic combined design. Fixed guide vanes (stator) form stable flow field, while infinitely variable speed impeller (rotor) creates accurately controlled centrifugal field for high-precision powder separation.

Qualified powder meeting fineness requirement passes through impeller gaps with airflow for collection. Coarser particles that fail grading fall back onto grinding table under gravity for regrinding, forming internal circulation. (Secondary classification system is required for powder finer than 1500 mesh)

Secondary Classification System

Primary + Pre-classification Mode: A cyclone separator or guide vane ring is installed after turbo classifier for pre-separation. Medium-coarse powder returns or feeds into turbo classifier for final sorting, greatly reducing classifier load and optimizing particle distribution efficiently at low power cost.

Dual Turbo Integrated Classification Mode: A second infinitely variable speed turbo classifier is connected in series to reclassify powder from first stage, stably outputting two grades of high-quality powder with tight particle distribution simultaneously.

Powder Collection & Dust Removal

Multi-stage dust collection system is adopted. Cyclone collector serves as primary collection, electrostatic precipitator or baghouse filter as secondary collector. Final powder is captured, and purified gas is discharged by induced draft fan.

Application Fields of Ultrafine Vertical Mill

Technical Parameters of Ultrafine Vertical Mill

Frequently Asked Questions for Ultrafine Vertical Mill

What classification modes are available for Ultrafine Vertical Mill?

Primary Classification: Simple structure, suitable for large-scale single-product production, commonly used for conventional ultrafine powder in building materials, metallurgy and solid waste industries.

Primary + Pre-classification: High-efficiency purification. Produces premium powder with optimized particle distribution at low energy cost, ideal for high-end fields with strict powder consistency requirements.

Dual Turbo Integrated Classifier: Simultaneously outputs two powder grades of different fineness to meet diversified market demands (e.g., catalysts for food and medical applications).

How to improve powder purity of Ultrafine Vertical Mill?

Optimize grinding pressure and system air volume to maintain stable material bed crushing, and adopt high-purity heat source to prevent thermal contamination. Configure powder iron remover and membrane filter baghouse filter in system to remove metallic impurities and avoid secondary pollution for high powder purity. Secondary classification system can be equipped for extreme purification when necessary.

What is the difference between classification systems of Ultrafine Vertical Mill and Ultrafine Ring Roller Mill?

Ultrafine Ring Roller Mill: Equipped with independent external classification system and high-precision centrifugal turbo classifier, delivering good particle shape and concentrated particle distribution.

Ultrafine Vertical Mill: Highly integrated built-in classification system with static-dynamic combined turbo classifier, achieving higher precision and narrower particle size distribution.

How to choose between Ultrafine Vertical Mill and Ultrafine Ring Roller Mill?

Ultrafine Ring Roller Mill: Compact structure and lower investment. Finished powder has favorable particle shape and flowability. Suitable for mid-end plastics, rubber, cosmetics, ceramic glaze, feed additives and other industries.

Ultrafine Vertical Mill: High integration, strong automation and large capacity. Final powder features high purity and highly concentrated particle distribution, applicable for high-end coatings, ink, plastics, rubber, electronics and electrical industries.