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Published on: December 13, 2016
Application of ferrate for the treatment of metal-sulfide
Mok-Ryun Yu1, Yoon-Young Chang, Arturo A Keller
1Department of Environmental Engineering, Kwangwoon University, Seoul, South Korea. magnolia10@kw.ac.kr
Abstract:
Fe(VI) was evaluated to treat metal-sulfides such as Fe-S, Pb-S, Cu-S and Cd-S contained in mine tailings known to generate acidic mine drainages. The rate of Fe(VI) reduction was dependent on the type of metal-sulfide as well as the concentration of each metal-sulfide. Fe(VI) reduction increased as the concentration of each metal-sulfide increased. The order of initial rates for the Fe(VI) reduction was Pb-S > Cu-S > Fe-S > Cd-S. The rate of Fe(VI) reduction by each metal sulfide increased as the ionic strength increased. For all metal sulfides, reduction efficiency of Fe(VI) was not affected by the presence of different background electrolytes except NaNO(2) and Na(2)SO(3). This result suggests that fully oxidized anions such as [Formula: see text] , [Formula: see text] , [Formula: see text] as well as redox insensitive anion such as Cl(-) are not involved in the redox reaction between Fe(VI) and metal sulfides.
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