{"id":14915,"date":"2026-05-28T03:07:47","date_gmt":"2026-05-28T03:07:47","guid":{"rendered":"https:\/\/www.air-classifier-mill.com\/?p=14915"},"modified":"2026-05-28T03:07:48","modified_gmt":"2026-05-28T03:07:48","slug":"what-is-the-difference-between-acm-and-jet-mill","status":"publish","type":"post","link":"https:\/\/www.air-classifier-mill.com\/fr\/what-is-the-difference-between-acm-and-jet-mill\/","title":{"rendered":"Quelle est la diff\u00e9rence entre ACM et Jet Mill ?"},"content":{"rendered":"

In the field of modern ultra-fine powder processing, the ACM Air Classifier Mill and the Jet Mill are two widely used core grinding devices. Although both fall under the category of dry ultra-fine grinding technology, they differ fundamentally in terms of operating principles, structural design, performance characteristics, energy consumption and costs, and applicable scenarios.<\/p>

Today, industries such as chemicals, pharmaceuticals, food, new materials, and non-metallic minerals are placing increasingly higher demands on powder fineness, purity, and particle size distribution. Understanding the core differences between these two types of equipment can help companies make appropriate selections, improve production efficiency, and control production costs. This article will compare the ACM mill <\/a>and the Jet Mill in detail from four aspects: principle, performance, application, and selection, providing practical reference for the powder processing industry.<\/p>

\"Broyeur<\/figure>

Core Operating Principles: Mechanical Impact Classification vs. Aerodynamic Self-Grinding<\/h2>

Moulin ACM<\/a>: Integrated Mechanical Crushing and Internal Classification<\/h3>

The ACM mill, short for Air Classification Mill, is an integrated device that combines high-speed mechanical impact grinding with dynamic air classification. Its core principle is \u201csimultaneous grinding and classification.\u201d The process consists of three steps:<\/p>

First\uff1a<\/strong>The material enters the grinding chamber via a metered feeding system. The high-speed rotating rotor, hammers, or grinding discs generate powerful impact, shear, and friction forces, breaking the material down into fine particles.<\/p>

Second: <\/strong> The crushed material rises to the classification zone under the negative pressure airflow of an induced draft fan. A frequency-controlled classification wheel rotates at high speed. The balance between centrifugal force and airflow drag achieves precise separation of coarse and fine particles.<\/p>

Finally:<\/strong> The fine powder meeting the required fineness passes through the classification wheel and is collected by a cyclone separator and dust collector. Coarse particles are thrown back into the crushing chamber for secondary crushing, forming a closed-loop crushing system.
This design allows the ACM mill to overcome the drawbacks of traditional mechanical mills, which follow a \u201cgrind first, then classify\u201d process, thereby preventing over-grinding. Furthermore, the fineness of the finished product can be flexibly controlled by adjusting the classification wheel speed and fan airflow. No additional classification equipment is required, resulting in a compact structure and a streamlined process.<\/p>

Air Jet Mill: Particle Self-Collision Grinding Driven by Supersonic Air Flow<\/h3>

The air jet mill, also known as an air jet pulverizer, is a pure air-jet grinding device powered by compressed air or superheated steam. Its core principle is \u201cself-grinding of the material.\u201d <\/p>

The working principle is as follows: <\/strong><\/p>

Purified and dried compressed air is accelerated to a supersonic speed of 300-500 m\/s through a Laval nozzle and injected into the pulverizing chamber, fluidizing the material. In the high-speed airflow convergence zone, the accelerated material particles collide, rub, and shear against each other, achieving ultrafine pulverization. The pulverized material then enters the classification zone with the airflow. The classification wheel separates and collects qualified fine powder. Coarse particles fall back to the pulverizing zone for further pulverization.
The core advantage of the air jet mill is the absence of contact with mechanical grinding media. The grinding process relies on the particles\u2019 own collisions rather than the force of mechanical components. This ensures maximum powder purity, making it particularly suitable for processing materials that require high hardness and high purity. It can achieve submicron or even nanoscale ultrafine grinding.<\/p>

ACM<\/a> and Jet Mill Comparison of Key Performance Parameters<\/h2>
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Broyeur ACM MJW900-L (1)<\/figcaption><\/figure>

Performance parameters serve as intuitive indicators for distinguishing between ACM mills and air-jet mills. The two types of mills differ significantly in terms of fineness range, energy consumption, production efficiency, particle size control, and material adaptability. These differences directly determine the application limits of the equipment.<\/p>

Grinding Fineness and Particle Size Distribution<\/h3>

ACM Mill:<\/strong><\/p>

The fineness range is concentrated at D97 = 5\u201375 \u03bcm, with the mainstream application range being 10\u201345 \u03bcm. This falls within the ultrafine to fine powder processing category and can meet the needs of most low- to mid-range powder applications. Its built-in classification wheel ensures high precision, resulting in a narrow particle size distribution. Particle morphology is uniform, with no noticeable agglomeration of fine particles. It is suitable for scenarios requiring high particle size uniformity.<\/p>

Air Jet Mill\uff1a<\/strong><\/p>

It offers a wider range of fineness, with a D97 of 1\u201310 \u03bcm. For certain materials, submicron-level (0.5\u20131 \u03bcm) grinding can be achieved, making it the equipment of choice for nano- and ultrafine powder processing. It produces a narrower particle size distribution, with smooth particle surfaces, high reactivity, and excellent dispersibility. It meets the extreme fineness requirements of high-end materials.<\/p>

Energy Consumption and Operating Costs<\/h3>

Energy consumption is one of the most significant differences between the two types of equipment. It directly impacts a company\u2019s production costs:<\/p>

ACM Mill:<\/strong><\/p>

Driven primarily by mechanical kinetic energy, with energy consumption ranging from 7.5 to 355 kW\/t. It features low energy consumption, is unaffected by minor fluctuations in material hardness, and has low operating costs. It is suitable for large-scale continuous production.<\/p>

Air Jet Mill:<\/strong><\/p>

Driven by high-pressure airflow kinetic energy, it requires auxiliary equipment such as air compressors and dryers. Energy consumption ranges from 75 to 1,200 kWh\/t. Energy consumption increases exponentially as material hardness rises and particle size decreases, resulting in higher operating costs.<\/p>

\"Jet<\/figure>

Material Compatibility<\/h3>

ACM Grinder<\/a>:<\/strong><\/p>

Suitable for brittle, low-abrasive materials with a Mohs hardness of 7 or below, such as calcium carbonate, talc, kaolin, starch, resins, pigments, pesticides, and food additives. For sticky or heat-sensitive materials, adaptation is possible via a cold air system. However, it is not suitable for high-hardness, high-abrasive materials (such as corundum or silicon carbide), as these can cause wear on mechanical components.<\/p>

Air Jet Mill:<\/strong><\/p>

Extremely versatile in material compatibility, capable of processing materials with Mohs hardness ranging from 1 to 9. It can handle everything from soft materials (graphite, carbon black) to ultra-high-hardness materials (silicon carbide, zirconia, diamond micropowder). It is particularly suitable for materials requiring high purity and freedom from metal contamination (pharmaceutical raw materials, battery materials, electronic ceramics). Since there is no mechanical contact, wear is minimal.<\/p>

Temperature Control and Contamination Risks<\/h3>

ACM Mill:<\/strong><\/p>

Mechanical grinding generates a small amount of frictional heat, which is rapidly dissipated by a high-volume airflow. The temperature in the grinding chamber is maintained below 60\u00b0C, making it suitable for general heat-sensitive materials. However, wear on mechanical components may result in trace metal contamination. Therefore, a ceramic lining is required for ultra-pure materials.<\/p>

Air Jet Mill:<\/strong><\/p>

The expansion of the airflow absorbs heat, keeping the grinding chamber temperature below 50\u00b0C. This low-temperature grinding process perfectly preserves the crystal structure and activity of heat-sensitive materials (such as flavorings, vitamins, and biopharmaceuticals). With no mechanical grinding contact, metal contamination can be controlled below 50 ppm, meeting the requirements for high-purity materials.<\/p>

Structural Design and Maintenance: Simple and Compact vs. Complex Systems<\/h2>

ACM Mill\uff1a <\/strong><\/p>

Compact structure with a small footprint. Consists of a grinding unit, classifier wheel, feeding system, cyclone separator, dust collector, and induced draft fan. Requires no high-pressure auxiliary equipment, making installation and commissioning simple. Mechanical components (rotor, hammers, classifier wheel) are wear parts that are easy to replace, resulting in low maintenance costs. Routine maintenance involves only periodic checks for component wear and dust removal, with a low operational threshold suitable for general operators.<\/p>

Air Jet Mill<\/strong>\uff1a<\/p>

The system is complex. In addition to the grinding unit, classification system, and collection system, it must be equipped with an air compressor, air receiver tank, and drying equipment. The piping layout is complex, the footprint is large, and installation and commissioning require professional personnel. There are no mechanical wear parts, and wear on the main unit is minimal. However, auxiliary equipment (air compressor, nozzles) requires regular maintenance. Maintenance costs and technical requirements are relatively high, and the operation team must possess a certain level of professional expertise.<\/p>

ACM and Jet Mill Industry Applications: Precisely Meeting Diverse Needs<\/h2>
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Broyeur \u00e0 classification pneumatique MJW350<\/figcaption><\/figure>

Mainstream Applications of ACM Mills<\/h3>