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Clays and Clay Minerals

, Volume 34, Issue 3, pp 266–274 | Cite as

Influence of Sulfate on Fe-Oxide Formation: Comparisons with a Stream Receiving Acid Mine Drainage

  • K. S. Brady
  • J. M. Bigham
  • W. F. Jaynes
  • T. J. Logan
Article

Abstract

An ochreous precipitate isolated from a stream receiving acid-sulfate mine drainage was found to consist primarily of goethite and lesser amounts of ferrihydrite-like materials. The Fe-oxide fraction, including goethite, was almost totally soluble in acid ammonium oxalate. Similar materials were produced in the laboratory by hydrolysis of ferric nitrate solutions containing 250 to 2000 μg/ml sulfate as Na2SO4. Initial precipitates of natrojarosite transformed to Fe-oxides upon aging for 30 days at pH 6.0. The proportion of goethite in the final products decreased with increasing sulfate (SO4/Fe = 0.2 to 1.8) in the initial hydrolysis solutions; only ferrihydrite-like materials were produced at SO4/Fe ratios > 1.5. Variations in SO4/Fe solution ratios also produced systematic changes in the color (10R to 7.5YR) and surface areas (49 to 310 m2/g) of the dried precipitates, even though total S contents were relatively constant at 2.5 to 4.0%.

Key words

Acid mine drainage Feroxyhite Ferrihydrite Goethite Iron Natrojarosite Sulfate 

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Copyright information

© The Clay Minerals Society 1986

Authors and Affiliations

  • K. S. Brady
    • 1
  • J. M. Bigham
    • 1
  • W. F. Jaynes
    • 1
  • T. J. Logan
    • 1
  1. 1.Department of AgronomyThe Ohio State UniversityColumbusUSA

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