AI Article Synopsis
- Pyrite and other iron sulfides can oxidize when exposed to dissolved oxygen in water, leading to environmental issues like increased acidity and Fe(2+) levels.
- A study at a Boeun site in South Korea tested the effectiveness of surface coatings (Na2SiO3 and KH2PO4) to prevent this oxidation over 449 days, finding that the rock sample had a high potential for acid production.
- Results showed that Na2SiO3 significantly reduced pyrite oxidation, keeping pH levels between 5-6 and decreasing oxidation rates by almost 100%, indicating its potential for field application in combating iron sulfide oxidation.
Article Abstract
Pyrite and other iron sulfides are readily oxidized by dissolved oxygen in aqueous phase, producing acidity and Fe(2+), which causes significant environmental problems. Applications of surface coating agents (Na2SiO3 and KH2PO4) 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 Na2SiO3 effectively inhibited the pyrite oxidation as compared to KH2PO4. Na2SiO3 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(2+) and SO4 (2-) 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 Na2SiO3 was highly effective and it might be applicable on field for inhibition of iron sulfide oxidation.
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| http://dx.doi.org/10.1007/s10653-015-9778-9 | DOI Listing |
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