| Titre : | Density based separations in the Reflux Classifier with an air–sand dense–medium and vibration |
| Auteurs : | S. A. Macpherson, Auteur ; S. M. Iveson, Auteur ; K. P. Galvin, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Minerals engineering (Vol. 23 N° 2, Janvier 2010) |
| Article en page(s) : | pp. 74-82 |
| Note générale : | Génie Minier Métallurgie |
| Langues : | Anglais |
| Index. décimale : | 622 (Industrie minière) |
| Tags : | Dense medium separation Gravity concentration Coal |
| Résumé : |
The Reflux Classifier is a device consisting of parallel inclined channels above a fluidized bed.
Water-based versions of the system have been successfully employed in industry for gravity separation of −2 + 0.25 mm coal and mineral matter. In this study an air-fluidized system was investigated using a single 2 m long inclined channel with 100 mm wide channels and 20 mm perpendicular spacing. Sand (−355 + 125 micron) was used as a dense–medium and vibration at two distinct levels was used to improve fluidization stability. Tracer particles of −6.35 + 1.00 mm nominal diameter and 1300 to 2400 kg/m3 density were used to study the effects of the vibration energy and vibration direction on the separation efficiency. The device was able to separate coal particles from a maximum of 8 mm down to 1 mm on the basis of density; hence this method has potential for industrial application. Results were analysed using a simple 2-parameter dispersion–convection model. Dense particles had negative slip velocities, low-density particles had positive slip velocities and the slip velocities were proportional to particle diameter. |
| DEWEY : | 622 |
| ISSN : | 0892-6875 |
| En ligne : | http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VDR-4XDKC9K-1&_user=6909337&_coverDate=01%2F31%2F2010&_rdoc=2&_fmt=high&_orig=browse&_srch=doc-info%28%23toc%235989%232010%23999769998%231550282%23FLA%23display%23Volume%29&_cdi=5989&_sort=d&_doca |
