|
| Impact of Coating Agent Sodium Triethylenetetramine Bisdithiocarbamate on Oxidation of Chalcopyrite |
| |
| View Full Text View/Add Comment Download reader |
| KeyWord:acid mine drainage（AMD）; chalcopyrite; passivation; oxidation |
| Author Name | Affiliation | | THAI Truong-giang | The Ministry of Education Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | LU Gui-ning | The Ministry of Education Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | LIAO Chang-jun | The Ministry of Education Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | CHEN Mei-qin | The Ministry of Education Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | DANG Zhi | The Ministry of Education Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China |
|
| Hits: 1685 |
| Download times: 2234 |
| Abstract: |
| Acid mine drainage（AMD） has been recognized as one of the most serious long-term environmental problems associated with mining. The oxidation of sulfide-rich tailing is the source of AMD. Therefore source control of AMD is regarded as a most effective way to prevent its environmental impact. In this study, a coating agent, sodium triethylenetetramine bisdithiocarbamate（DTC-TETA）, was explored to minimize the oxidation of chalcopyrite. Scanning electron microscope（SEM）, X-ray diffraction（XRD） and X-ray photoelectron spectroscopy （XPS） were used to examine the mechanisms of chalcopyrite oxidation inhibition by the agent. The coating effectively decreased the oxidation rate of chalcopyrite during 20 day of experiment. The concentrations of copper ion in chemical and biological oxidation systems treated with the coating agent were only 17% and 48% of the corresponding controls. Compared to uncoated one, the surface corrosion of the chalcopyrite coated with DTC-TETA was significantly reduced, indicating that the passivation film on chalcopyrite indeed isolated the contact of oxidants and bacteria. In addition, XRD and XPS analyses showed that new secondary minerals formed during the oxidation of the chalcopyrite, but they did not affect the oxidation process. Our results show that use of coating agent is an effective option to reduce the rates of chalcopyrite oxidation, which is of great significance for controlling AMD from the sources. |
|
|
|
