Effective Recovery of Gold from Chloride Multi-Metal Solutions Through Anion Exchange
Leachates from electronic waste, slag dusts generated during the processing of electronic waste, sweeping jewelry, and municipal solid-waste incineration residues contain a myriad of base metals, such as aluminum (Al: 10–2000 mg/L), copper (Cu: 10–1000 mg/L), iron (Fe: 10–500 mg/L), nickel (Ni: 0.1–...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-04-01
|
| Series: | Recycling |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2313-4321/10/2/64 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850143809625653248 |
|---|---|
| author | Isabel F. F. Neto Márcia A. D. Silva Helena M. V. M. Soares |
| author_facet | Isabel F. F. Neto Márcia A. D. Silva Helena M. V. M. Soares |
| author_sort | Isabel F. F. Neto |
| collection | DOAJ |
| description | Leachates from electronic waste, slag dusts generated during the processing of electronic waste, sweeping jewelry, and municipal solid-waste incineration residues contain a myriad of base metals, such as aluminum (Al: 10–2000 mg/L), copper (Cu: 10–1000 mg/L), iron (Fe: 10–500 mg/L), nickel (Ni: 0.1–500 mg/L), lead (Pb: 1–500 mg/L), tin (Sn: 1–100 mg/L), and zinc (Zn: 5–500 mg/L), which are present at much higher quantities than Au (0.01–10 mg/L), which raises several drawbacks to the efficient recycling of Au with high purity using hydrometallurgical strategies. The aim of this work was to study the efficiency and selectivity of two strong basic anion exchange (DOW<sup>TM</sup> XZ-91419.00 and Purogold<sup>TM</sup> A194) resins to recover Au from a chloride multi-metal solution containing these metals. For both resins, the adsorption kinetic and equilibrium parameters for Au(III), determined at 1.12 mol/L HCl, Eh = 1.1 V, and 25 °C, proceeded according to a pseudo-second order and a Langmuir isotherm (qmax was 0.94 and 1.70 mmol/g for DOW<sup>TM</sup> XZ-91419.00 and Purogold<sup>TM</sup> A194 resins, respectively), respectively. Continuous adsorption experiments of Au (48 µmol/L; 2.0%) from a chloride multi-metal solution evidenced high Au retention capacity and selectivity to Au over Al, Cu, Fe, Ni, and Zn but low selectivity to Au over Ag and Sn for both resins. Concentrated (>3.3 mmol/L) and pure (>94%) Au eluates were obtained for both resins. |
| format | Article |
| id | doaj-art-19a96b363b824e168aa2abaa4da93170 |
| institution | OA Journals |
| issn | 2313-4321 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Recycling |
| spelling | doaj-art-19a96b363b824e168aa2abaa4da931702025-08-20T02:28:33ZengMDPI AGRecycling2313-43212025-04-011026410.3390/recycling10020064Effective Recovery of Gold from Chloride Multi-Metal Solutions Through Anion ExchangeIsabel F. F. Neto0Márcia A. D. Silva1Helena M. V. M. Soares2REQUIMTE/LAQV, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, PortugalREQUIMTE/LAQV, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, PortugalREQUIMTE/LAQV, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, PortugalLeachates from electronic waste, slag dusts generated during the processing of electronic waste, sweeping jewelry, and municipal solid-waste incineration residues contain a myriad of base metals, such as aluminum (Al: 10–2000 mg/L), copper (Cu: 10–1000 mg/L), iron (Fe: 10–500 mg/L), nickel (Ni: 0.1–500 mg/L), lead (Pb: 1–500 mg/L), tin (Sn: 1–100 mg/L), and zinc (Zn: 5–500 mg/L), which are present at much higher quantities than Au (0.01–10 mg/L), which raises several drawbacks to the efficient recycling of Au with high purity using hydrometallurgical strategies. The aim of this work was to study the efficiency and selectivity of two strong basic anion exchange (DOW<sup>TM</sup> XZ-91419.00 and Purogold<sup>TM</sup> A194) resins to recover Au from a chloride multi-metal solution containing these metals. For both resins, the adsorption kinetic and equilibrium parameters for Au(III), determined at 1.12 mol/L HCl, Eh = 1.1 V, and 25 °C, proceeded according to a pseudo-second order and a Langmuir isotherm (qmax was 0.94 and 1.70 mmol/g for DOW<sup>TM</sup> XZ-91419.00 and Purogold<sup>TM</sup> A194 resins, respectively), respectively. Continuous adsorption experiments of Au (48 µmol/L; 2.0%) from a chloride multi-metal solution evidenced high Au retention capacity and selectivity to Au over Al, Cu, Fe, Ni, and Zn but low selectivity to Au over Ag and Sn for both resins. Concentrated (>3.3 mmol/L) and pure (>94%) Au eluates were obtained for both resins.https://www.mdpi.com/2313-4321/10/2/64gold recoverygold selectivitygold purificationmulti-metal solutionquaternary amine resinmixed amine resin |
| spellingShingle | Isabel F. F. Neto Márcia A. D. Silva Helena M. V. M. Soares Effective Recovery of Gold from Chloride Multi-Metal Solutions Through Anion Exchange Recycling gold recovery gold selectivity gold purification multi-metal solution quaternary amine resin mixed amine resin |
| title | Effective Recovery of Gold from Chloride Multi-Metal Solutions Through Anion Exchange |
| title_full | Effective Recovery of Gold from Chloride Multi-Metal Solutions Through Anion Exchange |
| title_fullStr | Effective Recovery of Gold from Chloride Multi-Metal Solutions Through Anion Exchange |
| title_full_unstemmed | Effective Recovery of Gold from Chloride Multi-Metal Solutions Through Anion Exchange |
| title_short | Effective Recovery of Gold from Chloride Multi-Metal Solutions Through Anion Exchange |
| title_sort | effective recovery of gold from chloride multi metal solutions through anion exchange |
| topic | gold recovery gold selectivity gold purification multi-metal solution quaternary amine resin mixed amine resin |
| url | https://www.mdpi.com/2313-4321/10/2/64 |
| work_keys_str_mv | AT isabelffneto effectiverecoveryofgoldfromchloridemultimetalsolutionsthroughanionexchange AT marciaadsilva effectiverecoveryofgoldfromchloridemultimetalsolutionsthroughanionexchange AT helenamvmsoares effectiverecoveryofgoldfromchloridemultimetalsolutionsthroughanionexchange |