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Pyrite leaching from coal and coal waste.

Authors
Dalverny-LE; Chaiken-RF; Kim-AG; Manns-CR
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9629, 1996 Jan; :1-38
Link
NIOSHTIC No.
20039459
Abstract
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.
Keywords
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
Publication Date
19960101
Document Type
Report of Investigations
Fiscal Year
1996
NTIS Accession No.
PB96-214804
NTIS Price
A04
Identifying No.
RI-9629
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9629
State
PA
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