Inhibition of pyrite oxidation by surface coating agents: Batch and field studies
- Inhibition of pyrite oxidation by surface coating agents: Batch and field studies
- 최재영; 지은도; 윤현식; 이우람; 박영태
- AMD; coating
- Issue Date
- European Geosciences Union
- The batch results of this study indicate that chemical oxidation of pyrite and YD and IG mine samples can be reduced significantly by amending phosphate
or cement as coating agents. The phos-phate treatment resulted in the formation of an iron-phosphate coating, and cement was precipitated as calcium
sulfate by hydra-tion on pyrite surfaces. Pilot scale tests with the phosphate coating agent were performed and showed that the microencapsulation
technique applied to the AMD site is promising. The production of SO42− from sulfide oxidation rapidly decreased by amending KH2PO4 to a background
level within 15 days, and this effect was maintained for 100 days (93.1% reduction). Future studies are necessary to explore the long-term stability of the
phos-phate coatings to reduce the dissolved metals and sulfate at AMD sites.
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