Gas dispersion and de-inking in a flotation column

The role of four gas dispersion parameters in ink particle collection was investigated in 4″ and 20″ flotation columns. Gas holdup ( ε g) and superficial gas velocity ( J g) were measured on-line and bubble size ( d b) was estimated using drift flux analysis that enabled bubble surface area flux ( S...

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Bibliographic Details
Published in:Minerals engineering 2003-08, Vol.16 (8), p.739-744
Main Authors: Hernández, H., Gómez, C.O., Finch, J.A.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Flotation kinetics
Flotation. Enrichment. Beneficiation
Froth flotation
Metals. Metallurgy
Modeling
Ores
Production of metals
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Summary:The role of four gas dispersion parameters in ink particle collection was investigated in 4″ and 20″ flotation columns. Gas holdup ( ε g) and superficial gas velocity ( J g) were measured on-line and bubble size ( d b) was estimated using drift flux analysis that enabled bubble surface area flux ( S b) to be calculated. Operating with approximately zero froth depth ink recovery as a function of retention time (controlled by underflow rate) was determined. Using a mixing model, the collection zone flotation rate constant ( k c) was estimated from the recovery––time data. The rate constant was not related to J g or d b but was linearly dependent on ε g and S b, similar to findings in mineral flotation studies.
ISSN:0892-6875
1872-9444
DOI:10.1016/S0892-6875(03)00170-5