Estimation of Rh, Ru, and Ir leaching kinetics during the sulfuric acid pressure leaching of Ni–Cu matte as a function of temperature, pressure, and acid concentration
In order to develop an improved understanding of the leaching behaviour of base metals and platinum group metals in a high pressure sulfuric acid leaching system, bench scale batch tests were performed to evaluate the effects of temperature, pressure, acid concentration, and solid-to-liquid ratio on...
| Main Authors: | , , , |
|---|---|
| Format: | Journal Article |
| Published: |
Elsevier Science BV
2013
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/7002 |
| _version_ | 1848745240839585792 |
|---|---|
| author | Dorfing, C Akdogan, G. Bradshaw, S Eksteen, Jacques |
| author_facet | Dorfing, C Akdogan, G. Bradshaw, S Eksteen, Jacques |
| author_sort | Dorfing, C |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | In order to develop an improved understanding of the leaching behaviour of base metals and platinum group metals in a high pressure sulfuric acid leaching system, bench scale batch tests were performed to evaluate the effects of temperature, pressure, acid concentration, and solid-to-liquid ratio on the system. The precipitation and leaching kinetics of the other precious metals (OPMs: rhodium, ruthenium, and iridium) were influenced primarily by the leaching temperature, while the copper leaching kinetics were mostly dependent on the initial acid concentration.Reactions describing the leaching behaviour were proposed based on the experimentally determined leaching kinetics data. Cationic exchange reactions between digenite and dissolved OPMs and between polydymite and dissolved OPMs resulted in OPM precipitation during the initial leaching stages. Copper leaching reactions preferentially consumed the available oxygen during the initial leaching stages. The experimental data were used to determine the rate constants of the reactions describing the leaching behaviour. This was done by means of the method of least squares, considering the differences between the predicted concentrations and the concentrations measured over time at different operating conditions. The dissolution rates of the OPM compounds increased in the order: oxides < alloys < sulfides. |
| first_indexed | 2025-11-14T06:14:13Z |
| format | Journal Article |
| id | curtin-20.500.11937-7002 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:14:13Z |
| publishDate | 2013 |
| publisher | Elsevier Science BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-70022017-09-13T15:54:28Z Estimation of Rh, Ru, and Ir leaching kinetics during the sulfuric acid pressure leaching of Ni–Cu matte as a function of temperature, pressure, and acid concentration Dorfing, C Akdogan, G. Bradshaw, S Eksteen, Jacques Reaction kinetics Leaching Precious metal ores Modelling In order to develop an improved understanding of the leaching behaviour of base metals and platinum group metals in a high pressure sulfuric acid leaching system, bench scale batch tests were performed to evaluate the effects of temperature, pressure, acid concentration, and solid-to-liquid ratio on the system. The precipitation and leaching kinetics of the other precious metals (OPMs: rhodium, ruthenium, and iridium) were influenced primarily by the leaching temperature, while the copper leaching kinetics were mostly dependent on the initial acid concentration.Reactions describing the leaching behaviour were proposed based on the experimentally determined leaching kinetics data. Cationic exchange reactions between digenite and dissolved OPMs and between polydymite and dissolved OPMs resulted in OPM precipitation during the initial leaching stages. Copper leaching reactions preferentially consumed the available oxygen during the initial leaching stages. The experimental data were used to determine the rate constants of the reactions describing the leaching behaviour. This was done by means of the method of least squares, considering the differences between the predicted concentrations and the concentrations measured over time at different operating conditions. The dissolution rates of the OPM compounds increased in the order: oxides < alloys < sulfides. 2013 Journal Article http://hdl.handle.net/20.500.11937/7002 10.1016/j.hydromet.2013.06.007 Elsevier Science BV restricted |
| spellingShingle | Reaction kinetics Leaching Precious metal ores Modelling Dorfing, C Akdogan, G. Bradshaw, S Eksteen, Jacques Estimation of Rh, Ru, and Ir leaching kinetics during the sulfuric acid pressure leaching of Ni–Cu matte as a function of temperature, pressure, and acid concentration |
| title | Estimation of Rh, Ru, and Ir leaching kinetics during the sulfuric acid pressure leaching of Ni–Cu matte as a function of temperature, pressure, and acid concentration |
| title_full | Estimation of Rh, Ru, and Ir leaching kinetics during the sulfuric acid pressure leaching of Ni–Cu matte as a function of temperature, pressure, and acid concentration |
| title_fullStr | Estimation of Rh, Ru, and Ir leaching kinetics during the sulfuric acid pressure leaching of Ni–Cu matte as a function of temperature, pressure, and acid concentration |
| title_full_unstemmed | Estimation of Rh, Ru, and Ir leaching kinetics during the sulfuric acid pressure leaching of Ni–Cu matte as a function of temperature, pressure, and acid concentration |
| title_short | Estimation of Rh, Ru, and Ir leaching kinetics during the sulfuric acid pressure leaching of Ni–Cu matte as a function of temperature, pressure, and acid concentration |
| title_sort | estimation of rh, ru, and ir leaching kinetics during the sulfuric acid pressure leaching of ni–cu matte as a function of temperature, pressure, and acid concentration |
| topic | Reaction kinetics Leaching Precious metal ores Modelling |
| url | http://hdl.handle.net/20.500.11937/7002 |