期刊
HYDROMETALLURGY
卷 110, 期 1-4, 页码 128-132出版社
ELSEVIER
DOI: 10.1016/j.hydromet.2011.08.011
关键词
Gold; Cementation; Thiourea; Iron powder; Negative effect of Oxidant
资金
- Science and Technology Department [102300410097, 092102310180]
- Education Department of Henan Province of China [2010GGJS-067]
The gold cementation by iron powder from thiourea solutions in the absence and presence of ferric ion was investigated. Ferric ion affects significantly the cementation reaction kinetics. The gold cementation without the presence of ferric ion obeys the first-order kinetics and is a diffusion controlled process. Ferric ion increases significantly the redox potential of the solutions, which results in the remarkable decrease of gold recovery. Tr-sodium citrate was used to overcome the negative effect of ferric ion on gold cementation reaction, which is attributed to its role of lowering the redox potential of the solutions with the formation of iron (III)-citrate complexes. (C) 2011 Elsevier B.V. All rights reserved.
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