农业环境科学学报Issue(6)：1210-1217,8.DOI:10.11654/jaes.2014.06.023
三乙烯四胺二硫代氨基甲酸钠对黄铜矿氧化的影响
Impact of Coating Agent Sodium Triethylenetetramine Bisdithiocarbamate on Oxidation of Chalcopyrite
摘要
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 pre-vent 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 oxida-tion 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 chal-copyrite 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 chalcopy-rite, 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 chal-copyrite oxidation, which is of great significance for controlling AMD from the sources.关键词
酸性矿山废水/黄铜矿/钝化剂/氧化Key words
acid mine drainage(AMD)/chalcopyrite/passivation/oxidation分类
资源环境引用本文复制引用
蔡长江,卢桂宁,廖长君,陈梅芹,党志..三乙烯四胺二硫代氨基甲酸钠对黄铜矿氧化的影响[J].农业环境科学学报,2014,(6):1210-1217,8.基金项目
国家自然科学基金重点项目（41330639）；国家自然科学基金面上项目 （）
