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Kinetics of the interaction of gold chloride solutions on arsenopyrite
- Source :
- Hydrometallurgy. 48:343-360
- Publication Year :
- 1998
- Publisher :
- Elsevier BV, 1998.
-
Abstract
- The stoichiometry and kinetics of AuCl 4 − cementation on arsenopyrite were studied. For solution potentials of 970–1020 mV (vs. SHE) the overall process is given by: 14/3 AuCl − 4 + FeAsS +8 H 2 O →14/3 Au + Fe 3+ + SO 2 4 + AsO 3− 4 + 56/3 Cl − +16 H + The kinetics are limited by transport in an aqueous phase with an activation energy of 20 kJ/mol. Kinetic constants are independent of the initial AuCl 4 − concentration.The pH and chloride ion concentration have an insignificant effect. The addition of thiourea in the ratio [Tio]/[Au[ III ]=4 inhibited the cementation process instantaneously. An X-ray photoelectron spectroscopy/Electron spectroscopy for chemical analysis (XPS/ESCA) depth profile study of the attacked arsenopyrite surface is included and a possible mechanism for arsenopyrite oxidation is discussed. Binding energies and quantitative analysis for S, As, Fe and Au are reported.
- Subjects :
- Arsenopyrite
Chemistry
Kinetics
Inorganic chemistry
Metals and Alloys
Electron spectroscopy
Chloride
Industrial and Manufacturing Engineering
X-ray photoelectron spectroscopy
visual_art
Cementation (metallurgy)
Materials Chemistry
medicine
visual_art.visual_art_medium
Qualitative inorganic analysis
Stoichiometry
medicine.drug
Subjects
Details
- ISSN :
- 0304386X
- Volume :
- 48
- Database :
- OpenAIRE
- Journal :
- Hydrometallurgy
- Accession number :
- edsair.doi...........3920eb33ed01ce93ffd11cbbeac064b1