CAJ | 학술논문

酸性矿山废水（AMD）的形成对环境造成严重危害，而从源头上控制其产生是一项重要的处理措施。本研究利用课题组前期研制的钝化剂三乙烯四胺二硫代氨基甲酸钠（DTC-TETA）对常见硫化矿物黄铜矿进行处理后，通过不同体系的摇瓶实验比较，研究该钝化剂对黄铜矿的化学氧化和生物氧化过程的影响，并利用SEM、XRD和XPS对黄铜矿进行分析，探讨钝化剂的作用机制。结果表明，钝化剂处理过的黄铜矿经过20 d的化学、生物氧化后，产生的铜离子浓度分别是其相应对照的17％和48％，说明钝化剂能有效抑制黄铜矿的氧化速率。SEM结果表明，黄铜矿表面在钝化剂处理后，经过氧化受到的侵蚀明显减少，这是由于钝化剂在黄铜矿表面形成包膜有效隔绝氧化剂和细菌对黄铜矿的接触。样品的XRD和XPS分析结果说明了经钝化剂处理过的黄铜矿在氧化过程中可形成一些产物，但这没有改变黄铜矿的氧化进程。因此，黄铜矿经钝化剂DTC-TETA处理后其氧化速率受到抑制，表明表面钝化法是一项处理硫化物矿物避免产生AMD造成危害的可行技术，这对于从源头上控制AMD具有重要意义。
산성광산폐수（AMD）적형성대배경조성엄중위해，이종원두상공제기산생시일항중요적처리조시。본연구이용과제조전기연제적둔화제삼을희사알이류대안기갑산납（DTC-TETA）대상견류화광물황동광진행처리후，통과불동체계적요병실험비교，연구해둔화제대황동광적화학양화화생물양화과정적영향，병이용SEM、XRD화XPS대황동광진행분석，탐토둔화제적작용궤제。결과표명，둔화제처리과적황동광경과20 d적화학、생물양화후，산생적동리자농도분별시기상응대조적17％화48％，설명둔화제능유효억제황동광적양화속솔。SEM결과표명，황동광표면재둔화제처리후，경과양화수도적침식명현감소，저시유우둔화제재황동광표면형성포막유효격절양화제화세균대황동광적접촉。양품적XRD화XPS분석결과설명료경둔화제처리과적황동광재양화과정중가형성일사산물，단저몰유개변황동광적양화진정。인차，황동광경둔화제DTC-TETA처리후기양화속솔수도억제，표명표면둔화법시일항처리류화물광물피면산생AMD조성위해적가행기술，저대우종원두상공제AMD구유중요의의。
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.