Sulfide Oxidation
nounPronunciation: /ˈsʌlfaɪd ˌɒksɪˈdeɪʃən/
The irreversible chemical reaction in which sulfide minerals (particularly pyrite, chalcopyrite, and sphalerite) are oxidized by atmospheric oxygen and water to produce sulfate ions and hydrogen ions, lowering pH. This process is accelerated at mine sites due to increased surface area exposure and can persist for decades or centuries even after mining ceases.
Plain English
Sulfide minerals in rock chemically react with oxygen and water to create sulfuric acid, permanently changing rock chemistry.
Etymology & History
Usage
"Sulfide oxidation kinetics must be quantified during site assessment to predict long-term AMD generation and treatment requirements."
Style guide notes: Use 'sulfide oxidation' as the primary term; 'pyrite oxidation' acceptable when specifically discussing iron disulfide reactions.
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Frequently Asked Questions
Which sulfide minerals most commonly cause AMD problems?
Pyrite is the most prevalent acid-generating sulfide; chalcopyrite, sphalerite, and galena also contribute significantly.
Can sulfide oxidation be stopped in reclaimed mines?
Oxidation cannot be reversed, but rates can be reduced through water saturation, oxygen exclusion, or encapsulation barriers.
Why Test Candidates on This?
Sulfide oxidation mechanisms are tested extensively in mine chemistry and reclamation engineering certification exams.
Required skill level: Mid