Journal of Northeastern University Natural Science ›› 2015, Vol. 36 ›› Issue (1): 124-128.DOI: 10.12068/j.issn.1005-3026.2015.01.027

• Resources & Civil Engineering • Previous Articles     Next Articles

Research on Tannic Acid as Depressant for Galena and Pyrite

QIU Xian-hui1, SUN Chuan-yao2, QIU Ting-sheng3   

  1. 1 .School of Civil and Environmental Engineering, University of Science and Technology Beijing,Beijing 100083, China; 2. State Key Laboratory of Mineral Processing, Beijing General Research Institute of Mining and Metallurgy, Beijing 100070, China; 3. School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China.
  • Received:2013-10-29 Revised:2013-10-29 Online:2015-01-15 Published:2014-11-07
  • Contact: QIU Xian-hui
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Abstract: An organic depressant tannic acid can strongly depress the galena and pyrite while has weekly impact on the flotation of chalcopyrite. Adsorption, UV spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy (EIS) tests were carried out to investigate the depress mechanism. The results showed that tannic acid adsorbed on the surface of galena and pyrite, which increased the Faraday resistance on mineral surface. Tannic acid can affect the electrochemical oxidation reaction of ethyl xanthate on galena and pyrite surface, hinder part of ethyl xanthate adsorbing on pyrite and galena surface. Since the hydrophilic of tannic acid and it can reduce the formation of hydrophobic product on mineral surfaces, which are the reasons for tannic acid can strongly depress the flotation of galena and pyrite.

Key words: sulphide ore flotation, pyrite, galena, organic depressant, electrochemistry, adsorption

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