Activated alumina-based adsorption and recovery of excess fluoride ions subsequent to calcium and magnesium removal in base metal leach circuits
An effective electrowinning process in hydrometallurgical industry requires fluoride levels in the base metal solution to be less than 10 mg/l. Selective removal of the fluoride ions from base solution isthus desired, if fluoride was added to control calcium and magnesium in the circuit. Consequentl...
| Main Authors: | , , , , |
|---|---|
| Format: | Journal Article |
| Published: |
Southern African Institute of Mining and Metallurgy
2009
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/6610 |
| _version_ | 1848745126503907328 |
|---|---|
| author | Lorenzen, L. Eksteen, Jacques Pelser, M. Aldrich, Chris Georgalli, G. |
| author_facet | Lorenzen, L. Eksteen, Jacques Pelser, M. Aldrich, Chris Georgalli, G. |
| author_sort | Lorenzen, L. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | An effective electrowinning process in hydrometallurgical industry requires fluoride levels in the base metal solution to be less than 10 mg/l. Selective removal of the fluoride ions from base solution isthus desired, if fluoride was added to control calcium and magnesium in the circuit. Consequently, adsorption of fluoride onto activated alumina was studied in a batch and a column set-up. Theeffects of base metal solution pH, temperature, initial concentration and flow rate on activated alumina performance were investigated in either a batch or column configuration. A two-level factorialexperimental design was implemented in studying column dynamics. Results demonstrate that activated alumina is an effective adsorbent for selective removal of fluoride from base solution. In the batch operation, fluoride was removed to values below the maximum allowable concentration (10 mg/l) when pH was = 8. In the column adsorption step at 55°C and 600mg/l initial concentration, up to 16 bed volumes were processed before breakthrough level was reached. Desorption step using 1% sodiumhydroxide solution achieved an elution of 8 bed volumes. The activated alumina (AA) had a capacity of 8.65 gF/l AA at the 10 mgF/l fluoride breakthrough level during the column adsorption test. |
| first_indexed | 2025-11-14T06:12:24Z |
| format | Journal Article |
| id | curtin-20.500.11937-6610 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:12:24Z |
| publishDate | 2009 |
| publisher | Southern African Institute of Mining and Metallurgy |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-66102017-02-28T01:30:59Z Activated alumina-based adsorption and recovery of excess fluoride ions subsequent to calcium and magnesium removal in base metal leach circuits Lorenzen, L. Eksteen, Jacques Pelser, M. Aldrich, Chris Georgalli, G. regeneration Fluoride activated alumina adsorption recovery An effective electrowinning process in hydrometallurgical industry requires fluoride levels in the base metal solution to be less than 10 mg/l. Selective removal of the fluoride ions from base solution isthus desired, if fluoride was added to control calcium and magnesium in the circuit. Consequently, adsorption of fluoride onto activated alumina was studied in a batch and a column set-up. Theeffects of base metal solution pH, temperature, initial concentration and flow rate on activated alumina performance were investigated in either a batch or column configuration. A two-level factorialexperimental design was implemented in studying column dynamics. Results demonstrate that activated alumina is an effective adsorbent for selective removal of fluoride from base solution. In the batch operation, fluoride was removed to values below the maximum allowable concentration (10 mg/l) when pH was = 8. In the column adsorption step at 55°C and 600mg/l initial concentration, up to 16 bed volumes were processed before breakthrough level was reached. Desorption step using 1% sodiumhydroxide solution achieved an elution of 8 bed volumes. The activated alumina (AA) had a capacity of 8.65 gF/l AA at the 10 mgF/l fluoride breakthrough level during the column adsorption test. 2009 Journal Article http://hdl.handle.net/20.500.11937/6610 Southern African Institute of Mining and Metallurgy restricted |
| spellingShingle | regeneration Fluoride activated alumina adsorption recovery Lorenzen, L. Eksteen, Jacques Pelser, M. Aldrich, Chris Georgalli, G. Activated alumina-based adsorption and recovery of excess fluoride ions subsequent to calcium and magnesium removal in base metal leach circuits |
| title | Activated alumina-based adsorption and recovery of excess fluoride ions subsequent to calcium and magnesium removal in base metal leach circuits |
| title_full | Activated alumina-based adsorption and recovery of excess fluoride ions subsequent to calcium and magnesium removal in base metal leach circuits |
| title_fullStr | Activated alumina-based adsorption and recovery of excess fluoride ions subsequent to calcium and magnesium removal in base metal leach circuits |
| title_full_unstemmed | Activated alumina-based adsorption and recovery of excess fluoride ions subsequent to calcium and magnesium removal in base metal leach circuits |
| title_short | Activated alumina-based adsorption and recovery of excess fluoride ions subsequent to calcium and magnesium removal in base metal leach circuits |
| title_sort | activated alumina-based adsorption and recovery of excess fluoride ions subsequent to calcium and magnesium removal in base metal leach circuits |
| topic | regeneration Fluoride activated alumina adsorption recovery |
| url | http://hdl.handle.net/20.500.11937/6610 |