KINETICS OF OXIDATION LEACHING OF Ag IN AMMONIACAL SOLUTIONS
MENG Xinghui; KE Jiajun(Institute of Chemical Metallurgy; Academia Sinica; Beijing)(Manuscript received 23 June; 1985; revised manuscript 17 February; 1986)
Cite this article:
MENG Xinghui; KE Jiajun(Institute of Chemical Metallurgy; Academia Sinica; Beijing)(Manuscript received 23 June; 1985; revised manuscript 17 February; 1986). KINETICS OF OXIDATION LEACHING OF Ag IN AMMONIACAL SOLUTIONS. Acta Metall Sin, 1987, 23(2): 190-197.
Abstract The leaching behaviour of Ag in NH_3-O_2 and NH_3-H_2O_2 aqueous solutions was investigated. The results show that the dissolution of Ag was restrained by forming of a silver suboxide film on the surface under low oxidant concentration and atmospheric pressure conditions (e.g., in NH_3-O_2-H_2O system); when the concentration of oxidant was high enough (e.g., in NH_3-H_2O_2-H_2O system), the leaching process was carried out without forming of the film and the rate of dissolution of Ag was controlled by a step of mass transfer. Based on experimental results, a reaction mechanism of oxidation leaching of Ag in ammoniacal solutions was discussed.
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