Journal of Northeastern University:Natural Science ›› 2017, Vol. 38 ›› Issue (5): 720-724.DOI: 10.12068/j.issn.1005-3026.2017.05.023

• Resources & Civil Engineering • Previous Articles     Next Articles

Dispersion Mechanism of Citric Acid in Flotation System of Hematite Containing Carbonate

YAO Jin, LI Dong, YIN Wan-zhong, HAN Hui-li   

  1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2015-12-10 Revised:2015-12-10 Online:2017-05-15 Published:2017-05-11
  • Contact: LI Dong
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Abstract:

Sedimentation tests, Zeta potential measurements, FTIR (Fourier transform infrared spectros copy) spectroscopy, and solution chemistry calculations were used to investigate the dispersion mechanism of citric acid in strong alkaline conditions (pH=11.0). The sedimentation testing results show that the mixed minerals (containing hematite, siderite, and quartz) can be partly dispersed by citric acid. The results of Zeta potential measurements and FTIR spectroscopy indicate that citric acid mainly absorbs on siderite and hematite surface and partly brings their Zeta potentials down, while the Zeta potential of quartz is slightly influenced and the adsorption of citric acid on quartz surface is weak. The solution chemistry calculations indicate that citric acid interacts with the hydroxylation surface of hematite and siderite by the form of [C6H5O73- toprevent the coagulation of minerals, which might explain the dispersion mechanism of citric acid in flotation system of hematite containing carbonate.

Key words: citric acid, dispersion flotation, hematite, siderite, solution chemistry calculation

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