Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6658873 | Hydrometallurgy | 2018 | 9 Pages |
Abstract
The oxidative leaching mechanism of sphalerite in ammoniacal solution was investigated by the combination of experimental method and first-principle calculations based on density functional theory. The interaction machanism of NH3, O2, and Na2S2O8 with the ZnS (110) surface was investigated by first-principle calculations. The NH3 molecule preferred to interact with the ZnS (110) surface at TZn with an interaction energy of â366.17â¯kJ/mol. The active site changed to BZn site on the ZnS (110) surface with the addition of oxidant (O2 or Na2S2O8). The ZnS bond on the ZnS (110) surface was dissociated, where S2â was oxidized into S22â. Zn extraction was enhanced by the addition of the oxidants. In water, S2O82â is more active than the O2 molecule to interact with the ZnS (110) surface with an interactional energy of â588.77â¯kJ/mol. The effects of the kinds and amount of the oxidant on the Zn extraction were determined under optimum leaching condition ([NH3]: [NH4+]â¯=â¯5:3, liquid to solid ratioâ¯=â¯25, temperatureâ¯=â¯383â¯K and leaching timeâ¯=â¯4â¯h). Experiment results showed that Zn extraction was significantly enhanced from 4.32% to 70.30% within 4â¯h at O2 partial pressure of 0.50â¯MPa or to 28.40% with the addition of persulfate.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Yaling Huang, Zhoulan Yin, Zhiying Ding, Jiling Feng, Chunxia Liu,