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Pyrite Reduction in Large Sized Coal via Heap Leaching

Public Domain


Details

  • Personal Author:
    Sharp FA
  • Description:
    Conventional coal preparation removes bulk inert materials, i.e., stone and free pyrite. Additional pyrite removal requires further size reduction and cleaning at increased cost. A passive and inexpensive process to remove pyrite from coal by biologically mediated heap leaching was studied. This process has been tested by the Bureau of Mines in large scale (9 to 21 metric ton) heap leaching systems, using indigenous bacteria, and allowing natural acids and oxidants to accumulate in the recycled lixiviant. Fifty percent of the pyrite was removed by heap leaching run-of-mine stoker size, Pgh. #8 coal from Phillipi, WV. A second test using conventionally cleaned and sized (.65 cm x 1.9 cm), Pgh. #8 coal from Powhatten mine, OH, removed about 12% of additional pyrite. With this coal, 32% of the pyrite was removed in large column studies, and 97% was removed when it was ground to less than 100 microns. A third test with a relatively low sulfur, run-of-mine Pgh. #8 coal from Pershina mine, McDonald, PA realized a 7% sulfur reduction. The effectiveness of heap leaching is apparently related to the size of the coal and the dispersion of pyrite within the coal matrix. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • Series:
    Mining Publications
  • Publisher:
    U.S. Department of the Interior, Bureau of Mines
  • Document Type:
    Text
  • Genre:
    Proceedings
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    PRC - Pittsburgh Research Center
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Volume:
    2
  • NIOSHTIC Number:
    nn:20050602
  • Citation:
    Proceedings of the International Land Reclamation and Mine Drainage Conference and Third International Conference on the Abatement of Acidic Drainage April 24-29, 1994, Pittsburgh, Pennsylvania. Pittsburgh, PA: United States Department of the Interior, Bureau of Mines, Special Publication SP 06B-94, 1994 Apr; 2:424
  • CAS Registry Number:
    Sulfur (CAS RN 7704-34-9)
  • Federal Fiscal Year:
    1994
  • Peer Reviewed:
    False
  • Source Full Name:
    Proceedings of the International Land Reclamation and Mine Drainage Conference and Third International Conference on the Abatement of Acidic Drainage April 24-29, 1994, Pittsburgh, Pennsylvania
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:d86859c1b4bee439af558a9b34023be32aecf0c85bc633fef2e54282f73094b7473e6186c88255883c4e024133df06ee2aee8a3df8eae6b3e7cc52ed01a7ae93
  • Download URL:
  • File Type:
    Filetype[PDF - 798.00 KB ]
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