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ABSTRACT
Bubble Sauter mean diameter and aeration rate of a gas-liquid system in a laboratory downflow flotation column were explored. Both critical coalescence concentration and Sauter mean diameter decreased with increasing superficial liquid velocity, and also the Sauter mean diameter was found to obviously increase with the increase in the sampling height under low dodecylamine concentration. The aeration rate increased as the dodecylamine concentration increased at a constant valve opening degree and also linearly increased as superficial air velocity increased at a constant superficial liquid velocity of 11 cm/s. Compared to the superficial air velocity, the dodecylamine concentration was found to present a larger effect on the Sauter mean diameter but a smaller one on the aeration rate within the studied ranges of the dodecylamine concentration and superficial air velocity.
List of symbols
| d32 | = | Bubble Sauter mean diameter |
| CCC | = | Critical coalescence concentration |
| Jl, Jg | = | Volumetric liquid and air flow rate per unit cross section of the downcomer, respectively |
| dL | = | Limiting d32 as the frother concentration tends to infinity |
| CCCx | = | A concentration of d32 reduce x% from that with water only to dL |
| Q | = | Aeration rate |
| H | = | Height |
| C | = | Concentration |
| BSD | = | Bubble size distribution |
Disclosure statement
The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the article.
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