Source:http://linkedlifedata.com/resource/pubmed/id/12115042
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
2
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pubmed:dateCreated |
2002-7-12
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pubmed:abstractText |
One of the important approaches to prevent pyrite (FeS(2)) oxidation and subsequent formation of acid mine drainage (AMD) is to create a surface coating on pyrite. In this study, a coating of iron 8-hydroxyquinoline was formed by leaching pyrite with a 0.10 M H(2)O(2)/0.0034 M 8-hydroxyquinoline solution; stability of the coated pyrite was tested under various pH and temperature conditions. The results showed that iron 8-hydroxyquinoline coating could significantly suppress further pyrite oxidation by both chemical (H(2)O(2)) and biological ( e.g., Thiobacillus ferrooxidans) processes. At pH from 3.0 to 5.0 and temperature from 10-40 degrees C, the amount of SO(4)(2-) leached out by 0.10 M H(2)O(2) from the coated pyrite samples was 54.8-70.1% less than that from the uncoated controls. The oxidation of pyrite followed a pseudo-zero-order kinetics under the constant concentration of H(2)O(2). In the presence of microorganisms, sulfate leached out of the uncoated pyrite in 1 year accounted for 5.32% of the total pyrite in the system, with a concurrent pH drop to 2.35 under the ambient room temperatures. In contrast, the amount leached out from the coated samples was only 0.15% of the total pyrite and the final pH was 5.48. Thus, the coating decreased the leachability of pyrite by 97% in the inoculated systems. In comparison to the more widely studied iron phosphate coating, the advantage of iron 8-hydroxyquinoline coating was that it inhibited both chemical and biological pyrite oxidation, whereas iron phosphate coating could only inhibit chemical pyrite oxidation.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Iron,
http://linkedlifedata.com/resource/pubmed/chemical/Iron Compounds,
http://linkedlifedata.com/resource/pubmed/chemical/Oxyquinoline,
http://linkedlifedata.com/resource/pubmed/chemical/Sulfides,
http://linkedlifedata.com/resource/pubmed/chemical/pyrite
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pubmed:status |
MEDLINE
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pubmed:month |
Aug
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pubmed:issn |
0090-4341
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
43
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
168-74
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pubmed:meshHeading |
pubmed-meshheading:12115042-Equipment Design,
pubmed-meshheading:12115042-Iron,
pubmed-meshheading:12115042-Iron Compounds,
pubmed-meshheading:12115042-Mining,
pubmed-meshheading:12115042-Oxidation-Reduction,
pubmed-meshheading:12115042-Oxyquinoline,
pubmed-meshheading:12115042-Sulfides,
pubmed-meshheading:12115042-Thiobacillus,
pubmed-meshheading:12115042-Water Pollution
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pubmed:year |
2002
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pubmed:articleTitle |
Suppression of pyrite oxidation by iron 8-hydroxyquinoline.
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pubmed:affiliation |
College of Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
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pubmed:publicationType |
Journal Article
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