Kinetics and mechanisms of the non-oxidative dissolution of sphalerite (zinc sulphide) |
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| Affiliation: | 1. Nuclear Science and Technology Development Center, Institute of Nuclear Engineering and Science, National Tsing Hua University, Nuclear and New Energy Education and Research Foundation, No. 101, Section 2, Kuang Fu Rd., HsinChu 30013, Taiwan, ROC;2. Institute of Nuclear Energy Research Atomic Energy Council, R.O.C., 1000, Wenhua Road Jiaan Village, Longtan Township, Taoyuan County 32546, Taiwan;3. Department of Mechanical Engineering, Chung Yuan Christian University, 200, Chung Pei Rd, Chung Li 32023, Taiwan, ROC;1. School of Public Health, University of Illinois at Chicago, Chicago, IL 60612, USA;2. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing 100084, China;1. Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454 Marne-la-Vallée, France;2. Université Paris Diderot, Sorbonne Paris Cité, IPGP, UMR 7154, CNRS, F-75205 Paris, France;3. Chair Group Pollution Prevention and Resource Recovery, UNESCO-IHE Institute for Water Education, P.O. Box 3015, 2601 DA Delft, The Netherlands;4. Université de Poitiers, IC2MP, UMR 7285, CNRS, Equipe Chimie de l''Eau et Traitement des Eaux, 86022 Poitiers, France;5. Univ. Lille Nord de France, Groupe ISA, Equipe Sols et Environnement, Laboratoire Génie Civil et géo Environnement (LGCgE), EA 4515, 48 Boulevard Vauban, F-59046 Lille, France;1. School of Engineering & Computer Science, West Texas A&M University, 2501 4th Avenue Canyon, TX 79016, USA;2. Civil & Environmental Engineering, University of Houston, N107 Engineering Building 1, Houston, TX 77204-4003, USA |
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| Abstract: | The kinetics of the non-oxidative dissolution of four samples of sphalerite (ZnS) of different origin were studied. It was concluded that the dissolution is independent of the stirrer speed and is first order in [H+], and that the activation energies for the removal and deposition reactions are not sensitive to the impurity content of the solid. The rate of reaction is described by an ionic charge transfer mechanism. A large addition of Zn2+ retards the initial rate because equilibrium conditions are established, whereas the addition of H2S to the reaction system lowers the final extent of reaction. The addition of Fe (III) retards the initial rate of reaction due to an anodic shift in the potential difference at the surface-solution interface, but increases the final extent of reaction as a result of the consumption of H2S by Fe (III) to form elemental sulphur and Fe (II). The observed inhibition of the initial rate for the impure samples is explained in terms of an electron-transfer theory similar to that proposed for non-stoichiometric metal sulphides. |
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