1. Parâmetros de dispersão de ar em células mecanicas de flotação em usinas brasileiras.
- Author
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Ojeda, Ricardo José Montesinos, de Lima, Odair Alves, Zanin, Massimiliano, and de Salles Leal Filho, Laurindo
- Subjects
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PARTICLE size determination , *FLOTATION , *FACTORIES , *SEPARATION (Technology) , *ANALYTICAL chemistry , *INDUSTRIAL engineering , *SUPERFICIALITY - Abstract
The aim of this paper is to present and discuss the air dispersion parameters determined for industrial Brazilian flotation circuits. The rougher and scavenger circuits of RPM, Taquari-Vassouras, Copebras and Fosfertil-Catalão (today Vale Fertilizantes) were investigated. For RPM and Taquari-Vassouras, the superficial gas velocity (Jg), gas hold-up (&egr;g), bubble size diameter (d32) and superficial area bubble flux (Sb were measured, whereas only the Jg and &egr;g were measured in the other circuits. The results pointed out that, except for RPM, all the circuits presented very low values for the air dispersion parameters. Taquari-Vassouras presented the lowest values for average Jg and gas hold-up: 0.05 cm/s and 5%, respectively. The highest value was presented for the rougher circuit of Cope-bras, 1.17cm/s, while RPM presented the highest values for &egr;g and bubble size, respectively 31% and 2.61mm. In the circuits where the calculation of the Sb parameter was possible, the results obtained lay in a range lower than those re-ported in literature. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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