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STRATEGIES FOR SEPARATING METALS FROM ACID MINE WATERS 1
Author(s) -
Cheney Marcos A.,
Swinehart James H.
Publication year - 1998
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1998.tb04153.x
Subject(s) - chemistry , inorganic chemistry , thiourea , precipitation , hydrogen peroxide , copper , metal ions in aqueous solution , coprecipitation , ferrous , metal , thiocyanate , zinc , ion , physics , organic chemistry , meteorology
Strategies for the precipitation and separation of the primary metal ions, Fe(II), Cu(II), Zn(II), Mn(II), and Cd(II) in acid waste waters such as those in tributaries of the upper Sacramento River in northern California, are discussed. The strategies exploit the: (1) differential oxygen and hydrogen peroxide oxidation and precipitation properties of the metal ions as a function of pH, (2) the addition of ions, such as Mg 2 + and Cl ‐ , to reduce unfavorable coprecipitation, and (3) the facilitation of oxidation‐reduction reactions between metal ions and the stabilization of particular oxidation states. This may be accomplished with specific complexing agents such as thiocyanate, SCN ‐ , and thiourea (TU), S = C(NH 2 ) 2 in order to separate copper at low pH as Cu(I) using Fe(II) as a reducing agent.