Pyrite leaching from coal and coal waste.
Dalverny-LE; Chaiken-RF; Kim-AG; Manns-CR
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9629, 1996 Jan; :1-38
This report describes laboratory studies conducted over a 4-year period to determine the physical and chemical factors affecting the rates and mechanisms of acid production from pyrite oxidation during heap leaching of pyrite in coal waste. Four experiments used a large trickle-bed column reactor containing stationary solid carbonaceous material (packed coal refuse or cleaned coal), downward flowing liquid lixiviant, and upward-flowing gaseous oxidant (air) and reaction products. The experimental objectives were to (1) characterize the controlling mechanisms for accelerating pyrite oxidation of coal refuse through leaching, (2) measure the rates of leaching under a variety of reactant conditions, and (3) determine scaling correlations from experiments having different refuse characteristics (particle size, permeability, geometry, and composition) and different leachant and oxidant characteristics.
Acid-mine-drainage; Bacteria; Chemical-reactivity; Coal; Ecological-concentration; Hydrocarbons; Hydrogen-ions; Iron-ions; Leaching; Metal-ions; Mine-waste; Mine-waters; Oxidation; Precipitation-Chemistry; Pyrite; Spoil; Sulfates; Trickling-filtration
Report of Investigations
NTIS Accession No.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9629