Ultrafine Grinding Mill

Ultrafine Grinding Mill Introduction

Ultrafine Grinding Mill, also known as ring roller mill, is ultrafine grinding equipment. It adopts multi-layer grinding rollers and rings (2~4 layers) to crush materials layer by layer. The classification system is equipped with high-precision centrifugal turbo classifier, delivering powder with excellent particle shape, good flowability and concentrated particle size distribution (D97＜2500 mesh, proportion of particles ＜2 μm ≤30%). It effectively solves common drawbacks of Raymond mill (insufficient fineness), jet mill (high energy consumption), ultrafine vertical mill (high investment cost) and ball mill classification line (complicated process). Suitable for general ultrafine powder industries such as rubber, cosmetics, ceramic glaze and feed additives.

Features & Advantages of Ultrafine Grinding Mill

Ultrafine Classification: Equipped with high-precision centrifugal turbo classifier, it stably produces 400~2500 mesh ultrafine powder with concentrated particle size distribution (D97＜2500 mesh, proportion of particles ＜2μm ≤30%).

Excellent Particle Shape: Finished particles are mostly round with few angular shapes, featuring good flowability and dispersibility. Ideal for plastic, rubber, cosmetics and other fields with strict requirements on particle morphology.

Flexible Configuration: Single-wheel or multi-wheel classifier optional. Multi-wheel type delivers higher precision and larger capacity. Secondary classification system can be expanded to meet higher precision requirements.

High Efficiency & Energy Saving: Multi-layer material bed grinding technology crushes materials step by step for high energy utilization rate. Comprehensive energy consumption is reduced by 30%~50% compared with jet mill.

Cost-effective: Lower initial investment than ultrafine vertical mill. Matching classification system (e.g. single-wheel + primary process) can be selected according to actual conditions to maximize economic benefits.

Process Flow of Ultrafine Grinding Mill

Crushing & Conveying

Raw materials are firstly crushed by crusher to feeding size ≤20mm, then sent to the ultrafine grinding mill via conveying equipment (bucket elevator, vibrating feeder, etc.).

Grinding & Classification

Materials enter the grinding chamber, lifted by rotating shovels and thrown between multiple grinding rollers and rings. Driven by rotary table, rollers repeatedly compress multi-layer material bed to realize ultrafine grinding. Afterwards, ground powder is transported by airflow to upper centrifugal turbo classifier (single-wheel or multi-wheel structure optional based on demand).

By adjusting the rotating speed of classifier impeller, qualified ultrafine powder passes through the classification wheel into collection system. Coarse particles are thrown back to grinding chamber under centrifugal force, fall onto grinding ring raceway for regrinding and form closed circuit cycle. (For powder above 800 mesh, secondary classification system can be equipped flexibly to guarantee classification precision.)

Secondary Classification System: Series configuration of primary turbo classifier + secondary turbo classifier. Classifiers are independently installed externally and connected to main machine and fan through pipelines. After grinding, materials are delivered by airflow to primary classifier for pre-classification, then semi-finished powder enters secondary classifier for fine classification. Rotating speed of both classifiers can be independently adjusted by frequency converter, producing finished powder with highly concentrated particle size distribution and almost no coarse particles.

Powder Collection & Dust Removal

Finally, qualified powder enters cyclone collector for gas-solid separation. Most powder is collected as finished product. Residual dust is recovered and purified by pulse bag dust collector. Clean gas after purification (concentration ≤10mg/m³) is discharged by fan. The whole system runs under negative pressure without dust leakage.

Application Fields of Ultrafine Grinding Mill

Technical Parameters of Ultrafine Grinding Mill

Frequently Asked Questions of Ultrafine Grinding Mill

Does single-wheel / multi-wheel of Ultrafine Grinding Mill refer to primary and secondary classification system?

No. Single-wheel and multi-wheel stand for classifier structure (one or multiple impellers), while primary and secondary represent process configuration. Each stage of secondary classification system can adopt single-wheel or multi-wheel classifier.

What is the difference between single-wheel and multi-wheel classifier?

Single-wheel Classifier: Adopts one large classifier, compact structure and low cost, but limited capacity and precision.

Multi-wheel Classifier: Multiple independent classifiers work in parallel, featuring large output and high precision with relatively higher price.

How to select matching classification system?

Single-wheel + Primary Classification: Simple structure, high cost performance, suitable for basic projects with limited budget.

Multi-wheel + Primary Classification: Large throughput and high classification precision, fit for small & medium production of conventional ultrafine powder.

Single-wheel + Secondary Classification: Extremely narrow particle size distribution of finished powder, for high-end ultrafine powder industries.

Multi-wheel + Secondary Classification: Maximum capacity and highest classification precision, applied in large-scale production of high value-added ultrafine powder.

Can Ultrafine Grinding Mill process medium-fine powder?

It is technically feasible but leads to overcapacity and poor cost-effectiveness. Ultrafine Grinding Mill is designed mainly for 400~2500 mesh ultrafine powder. When processing 80~400 mesh medium-fine powder, classifier speed and system airflow must be greatly reduced, which cannot achieve efficient grinding. Its equipment cost is less economical than Raymond mill. Normally it is not recommended for medium-fine powder unless you plan to upgrade to ultrafine powder production later.

Can Ultrafine Grinding Mill grind high-hardness materials?

Ultrafine Grinding Mill is suitable for brittle materials with Mohs hardness ≤7. It is not fit for high-hardness materials; otherwise grinding rollers and rings will suffer severe wear. For ultrafine processing of high-hardness materials, ball mill + air classifier production line is commonly adopted.