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Abstract
The recovery of fine hydrophilic particles in flotation is related to the recovery of water. Water is carried by bubbles into and through the froth. The amount transported (entrained) depends on bubble size, gas rate and the subject of this paper, frother type. To isolate the effect of frother type from that of bubble size, gas holdup is used as the correlating variable. Measurements were made using a bubble column (no solids) operated continuously with the overflow recycled. Using an automatically controlled 7 cm foam depth, the overflow rate of water is used as a measure of 'water carrying rate'. It is shown that the common frothers can be grouped into four families based on the water carrying rate-gas holdup relationship.
The recovery of fine hydrophilic particles in flotation is related to the recovery of water. Water is carried by bubbles into and through the froth. The amount transported (entrained) depends on bubble size, gas rate and the subject of this paper, frother type. To isolate the effect of frother type from that of bubble size, gas holdup is used as the correlating variable. Measurements were made using a bubble column (no solids) operated continuously with the overflow recycled. Using an automatically controlled 7 cm foam depth, the overflow rate of water is used as a measure of 'water carrying rate'. It is shown that the common frothers can be grouped into four families based on the water carrying rate-gas holdup relationship.
La récupération de la gangue fine hydrophile lors de la flottation est reliée à la récupération de l'eau. L'eau est transportée par les bulles dans et à travers la mousse. La quantité transportée (entraînée) dépend de la taille de bulle, du débit de gaz et, le sujet de cet article, du type de mousse. Pour isoler l'effet du type de mousse de celui de la taille de bulle, on utilise la rétention de gaz comme variable de corrélation. On a effectué des mesures en utilisant une colonne à bulles (sans solides) opérée en continu avec recyclage du trop-plein. En utilisant une profondeur de mousse automatiquement contrôlée de 7 cm, le taux de trop-plein d'eau est utilisé comme mesure du "taux de transport de l'eau". On montre que l'on peut grouper les moussants communs en quatre familles basées sur la relation taux de transport de l'eau-rétention de gaz.
