The influence of backwater Al3+ on diaspore bauxite flotation

Fang, Chaojun, Chang, Ziyong, Feng, Qiming, Xiao, Wei, Yu, Shichao, Qiu, Guanzhou and Wang, Jun (2017) The influence of backwater Al3+ on diaspore bauxite flotation. Minerals, 7 10: . doi:10.3390/min7100195


Author Fang, Chaojun
Chang, Ziyong
Feng, Qiming
Xiao, Wei
Yu, Shichao
Qiu, Guanzhou
Wang, Jun
Title The influence of backwater Al3+ on diaspore bauxite flotation
Formatted title
The influence of backwater Al3+ on diaspore bauxite flotation
Journal name Minerals   Check publisher's open access policy
ISSN 2075-163X
Publication date 2017-10-15
Year available 2017
Sub-type Article (original research)
DOI 10.3390/min7100195
Open Access Status DOI
Volume 7
Issue 10
Total pages 12
Place of publication Basel, Switzerland
Publisher MDPI AG
Language eng
Subject 1909 Geotechnical Engineering and Engineering Geology
1907 Geology
Abstract The effect of Al in backwater on the flotation of diaspore bauxite was investigated by micro-flotation tests and the underlying mechanisms were investigated by inductively coupled plasma (ICP) measurement, zeta potential measurements, solution chemistry analyses, and synchrotron near edge X-ray absorption fine structure (NEXAFS) analyses. The ICP measurement results show the concentration of Al in backwater was up to 1 × 10 mol/L. The micro-flotation results indicated that backwater Al reduced the flotation recovery of diaspore and improved the flotation recovery of kaolinite at pH 9, which was the pH value used in the industrial flotation. The adsorption of Al species changed the zeta potential, the Al atomic abundance, and the number of active sites on the mineral surface. In particular, the result of solution chemistry analyses and synchrotron NEXAFS analyses show that the Al in backwater was adsorbed on the mineral surface in the form of Al(OH) (s), and the bond of -Al-O-Al-(OH) or -Al/Si-O-Al-(OH) was formed at pH 9. It changed the intensity of hydrogen bond force between minerals and collectors, and resulted in the depression of diaspore flotation and the activation of kaolinite flotation. This study can be used to guide the application of backwater in the flotation of diaspore bauxite in industry.
Keyword Al3+
Backwater
Bauxite
Diaspore
Flotation
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 51474254
2013M531813
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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Created: Fri, 03 Nov 2017, 09:10:35 EST