Ultrafine powder is not only the basic material for the preparation of structural materials, but also has unique functional properties. It is widely used in fine ceramics, electronic components, bioengineering, and new printing materials. It can also be used in many fields such as high-performance refractory materials and fine chemicals. As these industries continue to increase their requirements for powder performance, the position of ultrafine powder classification technology in the entire powder processing technology has become increasingly prominent. It has become a key link in improving product quality and energy efficiency.
The Importance of Ultrafine Powder Classification
During the crushing process, only some particles can reach the target particle size. If this part of qualified powder is not separated in time, it will continue to be crushed together with the unqualified particles. This will not only waste energy, but also may cause excessive crushing of some materials and reduce product quality.
At the same time, as the particle size decreases, the agglomeration tendency between particles increases, and the phenomenon of “crushing and re-aggregation” is prone to occur. It may even lead to deterioration of the crushing effect. Therefore, efficient classification must be carried out in the preparation process of ultrafine powders. On the one hand, the product particle size distribution is controlled within the ideal range. On the other hand, fine powder is separated in time to improve crushing efficiency and reduce energy consumption.
With the increase of powder fineness and the expansion of production capacity, the difficulty of classification is also increasing. The efficient classification of ultrafine powders has become a bottleneck restricting the progress of powder technology. Therefore, classification technology is also regarded as one of the basic core technologies of powder engineering.
Basic Principles of Ultrafine Powder Classification
In a broad sense, powder classification is based on the physical and chemical properties of particles, such as particle size, density, color, shape, chemical composition, magnetism, radioactivity, etc.
In a narrow sense, classification usually refers to the use of particles in a specific medium (such as air or water) to produce different movement behaviors due to different particle sizes under the action of gravity, inertia or centrifugal force.
Thereby achieving effective separation.
Key Technical Issues of Classification
For any classification method, the key to achieve a better classification effect is how to improve the dispersion of the classified materials and choose a suitable classification force field.
After ultrafine processing, the material presents different properties from the original material. First, the specific surface area increases and the surface energy increases. Secondly, the proportion of the number of atoms or ions on the surface is greatly increased, which increases its surface activity. The attraction between particles increases or it is easy to aggregate due to the effect of foreign impurities such as water.
Ultrafine particles are also easy to gather on large particles due to collision absorption during the crushing process or due to static electricity and other forces after crushing. Whether in the air or in the liquid phase, it is easy to generate secondary particles with larger particle sizes. This makes the classification of ultrafine products more difficult than that of ordinary products.
Therefore, the first task of classification is to disperse the particles. Make them in a monodisperse state, thereby improving the dispersibility of the powder. That is, the basis of ultrafine powder lies in the dispersion of powder particles. It can be said that sufficient dispersion can make the classification process more efficient.
Clasificador de aire EPIC
Horizontal Air Classifier -HTS
Rueda de clasificación simple：
- Un rotor escalonado montado horizontalmente, con una velocidad lineal que puede alcanzar los 100 m/s;
- La velocidad del rotor se puede ajustar mediante conversión de frecuencia, y la distribución de la fuerza se puede ajustar de forma flexible;
- Adecuado para la clasificación precisa de material seco de tamaño micrométrico;
- D50 disponible: 1,5-25 μm.
Rueda de clasificación múltiple：
- El diámetro del rotor es de 315 mm a 630 mm, y consta de 2 a 6 rotores, que se utilizan para la clasificación de polvo ultrafino;
- La rueda clasificadora aumenta el espacio de clasificación en la parte superior del silo;
- Control por inversor, velocidad regulable;
- Mayor rendimiento que un rotor simple.
Clasificador de aire vertical – ITC
- Es muy eficaz para el corte de ápices de productos ultrafinos y productos de finura media.
- Aplicable a una amplia gama de tamaños de partículas, las más gruesas pueden alcanzar las 200 micras.
- Existen diferentes modelos para satisfacer diferentes necesidades de producción, y la capacidad de alimentación del modelo más grande puede alcanzar las 800 t/h.
- Diseño resistente al desgaste, capaz de manipular productos en polvo de dureza extremadamente alta.
- El diseño de la circulación de aire interna puede reducir la inversión y ahorrar espacio.
- It can be combined with a molino de bolas to form a closed-circuit production system for grinding various materials.
Clasificador centrífugo – CTC
- Clasifique el corte superior del ápice: d97 < 32 μm.
- Wide range of particle size: 32-250μm.
- Rango de capacidad de procesamiento: 1-50 t/h.
- La tecnología proviene de Alemania y el diseño es maduro y fiable.
- El equipo tiene un bajo consumo de energía, un bajo coste de inversión y un bajo coste de mantenimiento.
- No requiere equipos periféricos, ocupa poco espacio.
- Adecuado para materiales abrasivos, arena de cuarzo, mármol y otros materiales duros.
Polvo ÉPICO
Epic Powder, con más de 20 años de experiencia en la industria de polvos ultrafinos, impulsa el desarrollo futuro de estos polvos, centrándose en su trituración, molienda, clasificación y modificación. ¡Contáctenos para una consulta gratuita y soluciones personalizadas! Nuestro equipo de expertos se dedica a brindar productos y servicios de alta calidad para maximizar el valor de su procesamiento de polvos. Epic Powder: ¡Su experto de confianza en procesamiento de polvos!