Effect of water chemistry on froth stability and coal flotation

Kurniawan, A. U., Ozdemir, O., Nguyen, P. T. and Nguyen, A. V. (2009). Effect of water chemistry on froth stability and coal flotation. In: Thys Heyns, Chemeca 2009: Engineering our future. Chemeca 2009, Perth, Australia, (1-10). 27-30 September 2009.

Author Kurniawan, A. U.
Ozdemir, O.
Nguyen, P. T.
Nguyen, A. V.
Title of paper Effect of water chemistry on froth stability and coal flotation
Conference name Chemeca 2009
Conference location Perth, Australia
Conference dates 27-30 September 2009
Convener Thys Heyns
Proceedings title Chemeca 2009: Engineering our future
Place of Publication Barton, A.C.T., Australia
Publisher Engineers Australia
Publication Year 2009
Year available 2009
Sub-type Fully published paper
ISBN 9780858259225
Editor Thys Heyns
Volume 1
Start page 1
End page 10
Total pages 10
Collection year 2010
Language eng
Abstract/Summary Availability of good quality water sources for processing industries is becoming problematic. In coal preparation, the recycling of process water used to reduce freshwater consumption is increasingly practiced but it normally leads to the build-up of salts and surfactants in the process water. Therefore, the effect of the process water chemistry on plants, product quality and separation process becomes significant but is not yet fully understood. In this study, the coal flotation was performed in the solutions MgCl2, NaCl, and NaClO3. In addition to the flotation tests, the froth stability, bubble size and foam films were also studied to quantify flotation performance in the presence of salts. The results showed that the enhancement of flotation performance depends on the salt type and concentration. Particularly, MgCl2 showed the best flotation response. NaCl gave a medium flotation response whereas NaClO3 showed the lowest flotation response with an increase in salt concentration. The froth stability experiments showed that froth stability increases with increasing salt concentration, with MgCl2 giving the most stable froth and NaClO3 showing the lowest froth stability. The bubble size measurements revealed that increasing salt concentration decreases the bubble size which increases the flotation recovery. The results for the froth stability in the presence of salts agree with data for the foam film stability and lifetime. It is concluded that salts enhance coal flotation but the effect depends on the salt type and concentration.
Subjects E1
840304 Beneficiation or Dressing of Non-Metallic Minerals (incl. Diamonds)
091404 Mineral Processing/Beneficiation
Keyword Salts
Saline water
Bore water
Froth Stability
Bubble size
Coal flotation
Q-Index Code E1
Q-Index Status Confirmed Code

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Created: Sun, 11 Apr 2010, 12:01:05 EST by Amanda Lee on behalf of School of Chemical Engineering