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Main Title Sulfide to Sulfate Reaction Mechanism. A Study of the Sulfide to Sulfate Reaction Mechanism as it Related to the Formation of Acid Mine Waters.
Author Smit, E. E. ; Shumat, K. S. ;
CORP Author Ohio State Univ. Research Foundation, Columbus.
Year Published 1970
Report Number FWPCA-14010-FPS;
Stock Number PB-214 876
Additional Subjects ( Sulfide minerals ; Oxidation) ; ( Pyrite ; Oxidation) ; ( Water pollution ; Mine waters) ; ( Biodeterioration ; Pyrite) ; Aquatic microbiology ; Iron sulfides ; Ferrobacillus ; Mine acid drainage
Library Call Number Additional Info Location Last
NTIS  PB-214 876 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 129p
A detail study of the mechanisms and kinetics of the chemical reactions responsible for acid mine drainage is discussed. The mineralogical features of the solid phase reactant (pyrite) that determine its reactivity were described. The rate-limiting reactions and variables affecting the rate of these reactions were identified. It was found that two basic oxidation modes are important: oxygenation, in which oxygen is the immediate oxidizing agent; and ferric ion (or microbiologically catalyzed) oxidation, in which ferric ions are the oxidants. From a knowledge of the dissolved oxygen, ferric/ferrous ratio, and total iron ion content at the reaction site, the reaction regime can be determined. Kinetic equations were derived for both reaction modes. From these basic relationships the oxidation rate in real pyritic systems can be accurately predicated when conditions at the reaction site are known. (Author)