Neutralization of Ferrous Iron-Containing Acid Wastes

Details

• Personal Author:
  Cywin, Allen ; Mihok, Edward A.
• Description:
  Fe2+-containing waste waters, from pickling operations or mine drainage, are effectively cleaned up of heavy metals, giving an effluent with a ph >6, by neutralizing with a limestone slurry and then air stripping to remove co2 from the neutralized solution. Prior to the neutralization the fe2+ to fe3+ ratio in the waste water is adjusted to that in fe3o4 by a catalytic oxidation. A mixed valence sludge of higher density is precipitated and the better settling characteristics of the precipitate requires lesser amounts of limestone neutralizer; use of a slight excess of limestone (2-10 pct) is recommended for best results. [Description provided by NIOSH]
• Subjects:
  Ferrous Compounds Occupational Health Safety
• Series:
  Mining Publications
• Document Type:
  Text
• Genre:
  Other
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRC - Pittsburgh Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  5 pdf pages
• NIOSHTIC Number:
  nn:10011859
• Citation:
  U S Pat 3 617 562 1971 Nov; :
• Federal Fiscal Year:
  1972
• Peer Reviewed:
  False
• Source Full Name:
  U.S. Pat. 3,617,562; Nov. 2, 1971; Chem. Abstr. 76:27,827F
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:c78c9b871bb9350ecf9de65a7778fc551263ff56d594f61c6afc0396c2c52ce3666b05a372063f7f7230662d0e65b2db8e463b091af02c95f81423e17a9ce149
• Download URL:
  https://stacks.cdc.gov/view/cdc/236415/cdc_236415_DS1.pdf
• File Type:
  [PDF - 400.37 KB ]