| Autor: |
Kang, Chan-Ung, Jeon, Byong-Hun, Park, Seong-Sook, Kang, Jin-Soo, Kim, Kang-Ho, Kim, Dong-Kwan, Choi, Ui-Kyu, Kim, Sun-Joon |
| Předmět: |
|
| Zdroj: |
Environmental Geochemistry & Health; Oct2016, Vol. 38 Issue 5, p1137-1146, 10p |
| Abstrakt: |
Pyrite and other iron sulfides are readily oxidized by dissolved oxygen in aqueous phase, producing acidity and Fe, which causes significant environmental problems. Applications of surface coating agents (NaSiO and KHPO) were conducted at Boeun (Chungbuk, South Korea) outcrop site, and their efficiencies to inhibit the oxidation of sulfide minerals were monitored for a long-term period (449 days). The rock sample showed positive Net Acid Production Potential (NAPP = 20.23) and low Net Acid Generation pH (NAGpH = 2.42) values, suggesting that the rock sample was categorized in the potential acid-forming group. For the monitored time period (449 days), field study results showed that the application of NaSiO effectively inhibited the pyrite oxidation as compared to KHPO. NaSiO as a surface coating agent maintained pH 5-6 and reduced oxidation of pyrite surface up to 99.95 and 97.70 % indicated by Fe and SO release, respectively. The scanning electron microscope and energy-dispersive X-ray spectrometer analysis indicated that the morphology of rock surface was completely changed attributable to formation of iron silicate coating. The experimental results suggested that the treatment with NaSiO was highly effective and it might be applicable on field for inhibition of iron sulfide oxidation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink