a. A pneumatic flotation process with a counter-current flow of rising bubbles against settling ore within the flotation cell. Typically, the cell height is much greater than the cross section of the cell. The feed slurry is input above the midpoint of the column and water sprays are used at the top of the froth column to remove entrained hydrophilic particles from the froth. Kelly
b. Flotation carried out in a column machine utilizing countercurrent flow of air bubbles from the bottom and solid reagent-conditioned material from the top, such that tailings are withdrawn at the column bottom and the concentrate is collected over the column lip. There is no mechanical agitation. SME, 1
Source:
Dictionary of Mining, Mineral, and Related Terms












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