Flotation of coal particles in MgCl2, NaCl, and NaClO3 solutions in the absence and presence of Dowfroth 250

Kurniawan, A. U., Ozdemir, O., Nguyen, A. V., Ofori, P. and Firth, B. (2011) Flotation of coal particles in MgCl2, NaCl, and NaClO3 solutions in the absence and presence of Dowfroth 250. International Journal of Mineral Processing, 98 3-4: 137-144. doi:10.1016/j.minpro.2010.11.003


Author Kurniawan, A. U.
Ozdemir, O.
Nguyen, A. V.
Ofori, P.
Firth, B.
Title Flotation of coal particles in MgCl2, NaCl, and NaClO3 solutions in the absence and presence of Dowfroth 250
Formatted title
Flotation of coal particles in MgCl2, NaCl, and NaClO3 solutions in the absence and presence of Dowfroth 250
Journal name International Journal of Mineral Processing   Check publisher's open access policy
ISSN 0301-7516
Publication date 2011-03-09
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.minpro.2010.11.003
Volume 98
Issue 3-4
Start page 137
End page 144
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2012
Language eng
Formatted abstract
Separation of naturally hydrophobic particles, such as coal, by flotation is known to be enhanced with the addition of salt solutions into the system. However, the exact reasons for this enhancement are not clear yet. In this study, flotation of coal particles in MgCl2, NaCl, and NaClO3 solutions in the absence and in the presence of a strong frother, i.e., Dowfroth 250, was investigated to clarify the flotation enhancement mechanism and to correlate the flotation recovery with froth stability and bubble size distribution at the froth phase. The results of the flotation experiments showed that the presence of electrolytes in the system clearly enhanced the flotation recovery depending on its type and concentration. During the experiments, MgCl2 and NaClO3 solutions showed the highest and the lowest flotation performance improvements, respectively. The froth stability tests indicated that there is a correlation between the flotation recovery and the stability profile of the froth. The most stable froth was obtained with MgCl2 and the lowest froth stability was obtained with NaClO3. Additionally, a direct correlation was found between the flotation recovery and the bubble size distribution of the froth phase. The bubble size measurements revealed that increasing the electrolyte concentration decreased the bubble size, which, in turn, increased the flotation recovery. It is concluded that, the addition of salt solutions to a flotation system produces finer bubble size distribution at the froth phase, which enhances the coal flotation kinetics, depending on the type and the concentration of the electrolyte.
Keyword Flotation
Coal
Salt
Froth stability
Ion-specific effect
Inorganic electrolytes
Aqueous-solutions
Froth flotation
Coalescence
Bubbles
Hydrophobicity
Stability
Water
Size
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 11 November 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2012 Collection
 
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Created: Wed, 12 Oct 2011, 23:11:45 EST by Professor Anh Nguyen on behalf of School of Chemical Engineering