| Titre : |
Jet milling of low-density products |
| Type de document : |
texte imprimé |
| Auteurs : |
Bernhard Renner, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 39-41 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Fragmentation
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The author discusses the effects and influences of the main jet milling parameters, with a special focus on low density products.
Merials with bulk densities below 200kg/m3 can be a challenge for mechanical processes. Especially grinding of very fine products can change the basic conditions in jet mills significantly. A big potential for process improvements can be expected when the individual properties of such products are considered. This investigation reviews the effects/influences of the main jet milling parameters, with a special focus on low density products. The aim was to transfer all positive results into a special mill/plant design for such products.
Although the jet mill principle with opposed jets was invented more than 140 years ago, its evolution is not over yet and the technology can be improved even further.
The typical material used for research and investigation tests of new processes or machines is limestone. This is due, among other things, to the easy availability, harmless character and low price of this material. As a consequence, almost all empirical laws which are valid in the grinding and classification sector are exclusively based on tests with limestone. In most cases, these laws provide good comparability and/or allow a good approximation of some tendencies. Limestone shows moderate material densities (2600-2900kg/m3) and a real comminution is required to reach finer particle sizes |
| Note de contenu : |
- Low mass as a challenge for the comminution process
- Deagglomeration makes high grinding pressure unnecessary
- Feeding zone : a single powder pump replaces feeder and gate
- Grinding zone : deceleratio speed and hold-up
- Transfer zone : housing diameter without any influence
- Classification zone : classifier wheel and control parameters
- Product separation by filtration
- Summary : modifications and adjustments necessary for LDP |
| En ligne : |
https://drive.google.com/file/d/1MT3FO65DTuadPD1EVtRRTmXK5HrLJl66/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36770 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 211, N° 4671 (10/2021) . - p. 39-41
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