Accelerated pyrite oxidation/enhanced alkalinity couple to reduce acid mine drainage.
Caruccio-FT; Geidel-G; Bradham-WS
NTIS: PB 91-169805, Available for Reference At Bureau Libraries, 1991 :1-139
Acid mine drainage occurs when the balance of acid production exceeds alkalinity. One possible remediation strategy is to selectively remove pyrite from the hydrogeochemistry impacting the drainage quality through accelerated pyrite oxidation using chemical oxidants. The feasibility of this approach was evaluated using high-sulfur and/or low-sulfur organic-rich shales, underclays, and refuse and a clean sandstone through column and tub leaching tests, using calcium hypochlorite and hydrogen peroxide as the oxidizing agents. The organic matter was preferentially consumed by the oxidants, providing little residual for pyrite oxidation. With the exception of the sandstone, the addition of the oxidant had little effect on accelerating the oxidation rates. The highly alkaline calcium hypochlorite inhibited pyrite oxidation. The oxidant purging technique therefore is best used to treat clean sandstones and rocks that are relatively free of organic matter.
Mining; Acid drainage; Remediation; Geochemistry; Oxidation; Oxidative processes; Sulfur compounds; Oxidizers; Organic compounds; Alkalines; Calcium compounds; Reaction rates
CP; Final Contract Report
NTIS: PB 91-169805; Available for Reference At Bureau Libraries
University of South Carolina