CRHGM Ultrafine Grinding Mill

CRHGM Ultrafine Grinding Mill Information Introduction

The CRHGM Ultrafine Grinding Mill (also known as Ultrafine Ring Roller Mill) is a high-precision dry grinding equipment (moisture content ≤6%) developed by Cronus Machinery based on the Raymond mill, specifically for the field of ultrafine powder processing.

It utilizes multiple grinding rings working in coordination with several sets of grinding rollers, combined with a high-precision centrifugal turbo classification system, successfully breaking through the fineness limit of Raymond mills and achieving stable and efficient ultrafine powder production in the range of 400 mesh to 2500 mesh (D97<5μm). (A secondary classification system is required when processing ultrafine powder >800 mesh.)

Features and Advantages of CRHGM Ultrafine Grinding Mill

The ultrafine grinding mill utilizes multi-layer grinding and centrifugal turbine classification technology, offering high classification precision and a concentrated particle size distribution. With stepless speed adjustment, its operational energy consumption is lower than that of jet mills, while its investment cost is more economical than that of ultrafine vertical mills. It is the preferred equipment for small to medium-scale ultra-fine powder processing.

Structural Features

Grinding System: Utilizes multiple grinding rings working in coordination with several sets of grinding rollers (typically 2~4 layers). Driven by the rotary table, the grinding rollers roll tightly against the grinding rings, performing multiple rolling and ultrafine crushing on the formed multi-layer material bed.

Classification System: Centrifugal, high-precision turbo classifier generates strong centrifugal force through high-speed rotating classification wheel, with infinitely variable speed control. A secondary classification system is optional.

Collection System: Adopts cyclone collector + pulse bag filter design, with high total product collection rate, collection efficiency ≥99.9%, and clean production environment.

Fan System: Provides stable airflow for the system, maintains negative pressure operation, reduces system energy consumption, and creates a pneumatic classification environment.

Performance Advantages

Ultrafine Classification: Successfully solves the fineness deficiency of Raymond mills (typically ≤400 mesh), enabling industrial stable production of 400~2500 mesh (D97<5μm) ultrafine powder.

Precise and Flexible: Centrifugal, high-precision turbo classifier with infinitely variable speed control achieves precise control of powder fineness, promptly separates qualified ultrafine powder, effectively avoids over-grinding, and ensures concentrated particle size distribution.

High Efficiency and Energy Saving: Adopts multi-layer material bed grinding technology with high energy conversion rate, achieving significant energy saving effect of approximately 30%~50% compared to jet mills.

Clean and Environmental Protection: Full-process closed negative pressure operation effectively suppresses dust escape. Equipped with cyclone collector and pulse bag filter, exhaust emission concentration ≤10mg/m³.

Process Flow of CRHGM Ultrafine Grinding Mill

Raw Material → Crusher → Ultrafine Ring Roller Mill → Multi-layer Rolling → Pneumatic Conveying → Centrifugal Classification → Ultrafine Powder → Cyclone Collector → Pulse Bag Filter → Finished Product Packaging

Crushing and Conveying

Raw material is coarsely crushed by a crusher to a particle size meeting the feed requirement of the Ultrafine Ring Roller Mill (≤20mm), and conveyed to the raw material storage silo via a bucket elevator. It is then uniformly, continuously, and quantitatively fed into the main unit of the Ultrafine Grinding Mill through a vibrating feeder.

Multi-layer Rolling, Centrifugal Classification

After entering the grinding zone of the main unit, the material is scooped up by shovels and thrown into the rolling area formed by multiple sets of grinding rollers and rings. Driven by the rotary table, the grinding roller system rolls and crushes the multi-layer material bed, achieving ultrafine grinding with extremely high energy utilization efficiency. The ground powder is pneumatically conveyed by the fan to the upper centrifugal, high-precision turbo classifier (single-head or multi-head classifier).

By infinitely variable adjustment of the classification impeller speed, qualified ultrafine powder passes through the classification wheel driven by airflow and enters the collection system. Coarse particles are thrown back to the grinding chamber by centrifugal force, falling into the grinding ring raceway for regrinding, forming a closed-circuit cycle, achieving precision processing of 400~2500 mesh powder. (A secondary classification system is required when processing ultrafine powder >800 mesh.)

Secondary Classification System: Adopts a series configuration of "primary turbo classifier + secondary turbo classifier". Both classifiers are independently externally mounted, connected to the main unit and fan via pipelines. After grinding, the material is conveyed by airflow to the primary classifier for rough classification, and the semi-finished product then enters the secondary classifier for fine classification. The speeds of both primary and secondary classifiers can be independently adjusted via frequency converters, precisely controlling powder particle size. Through two-stage high-precision classification, the finished product contains almost no coarse particles, with extremely concentrated particle size distribution.

Collection and Dust Removal

Qualified powder enters the cyclone collector with airflow, achieving gas-solid separation under centrifugal force, with most of the finished powder being collected. The residual airflow containing trace dust enters the pulse bag filter for recovery and purification. The purified clean gas (concentration ≤10mg/m³) is discharged through the fan. The entire system operates under negative pressure with no dust leakage.

Application Scenarios of CRHGM Ultrafine Grinding Mill

Technical Parameters of CRHGM Ultrafine Grinding Mill

Frequently Asked Questions about Ultrafine Grinding Mills

How to choose the right Ultrafine Grinding Mill?

Ultrafine Grinding Mill: Compact structure, lower investment. The centrifugal high-precision turbo classification system produces ultrafine powder with good particle shape and excellent flowability. Suitable for mid-end plastics, rubber, cosmetics, ceramic glazes, feed additives and other fields.

Ultrafine Vertical Mill: High integration, strong automation, large capacity. The precision classification system combining dynamic and static elements produces ultrafine powder with high purity and highly concentrated particle size distribution. Suitable for high-end coatings, inks, plastics, rubber, electronics and electrical fields.

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

Ultrafine Grinding Mill: Adopts an independent external turbo classification system, utilizing centrifugal force to achieve precise classification, with advantages of high precision and concentrated particle size distribution.

Ultrafine Vertical Mill: Adopts a highly integrated internal classification system with a turbo classifier designed with combined dynamic and static elements, achieving large-scale, high-precision ultrafine powder processing.

Are single-head and multi-head the same as primary and secondary classification systems for Ultrafine Grinding Mills?

No. Single-head and multi-head refer to the structure of the Ultrafine Grinding Mill, where the classifier consists of one or multiple classification impellers. Primary and secondary refer to the process flow of the Ultrafine Grinding Mill. Each stage of the secondary classification system can be flexibly designed with single-head or multi-head classifiers.