Improved froth flotation process and apparatus

B - Operations – Transporting – 03 – D

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B03D 1/14 (2006.01) B03B 11/00 (2006.01) B03D 1/02 (2006.01)

Patent

CA 2402400

A froth flotation process typically used to separate particulate materials such as coal, has a mixed size feed (1) separated in a sieve bend (2) into a stream of relatively fine particles (3) and a stream of relatively coarse particles (14). The fine particles are fed to a flotation cell (7) in the normal manner, while the coarse particles are mixed with wash water (16) and distributed onto or into the froth layer (10) by wash water distribution apparatus (19, 20). Alternative variations of wash water distribution apparatus able to handle coarse particles are also described.

L'invention concerne un procédé de flottation par mousse généralement utilisé pour séparer des matières particulaires telles que le charbon. Dans ce procédé, une alimentation de taille mixte (1) est triée au moyen d'un tamis courbe (2) de façon à obtenir un flux de particules relativement fines (3) et un flux de particules relativement grosses (14). Les particules fines sont normalement introduites dans une cellule de flottation (7), tandis que les grosses particules sont mélangées avec de l'eau de lavage (16) et distribuées sur ou dans la couche de mousse (10) au moyen d'un appareil de distribution d'eau de lavage (19, 20). L'invention concerne également des variantes de cet appareil de distribution d'eau de lavage capables de traiter les grosses particules.

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