Factors affecting the elution of Pt, Pd and Au cyanide from activated carbon

Snyders, C.A.; Bradshaw, S.M.; Akdogan, G.; Eksteen, Jacques

doi:10.1016/j.mineng.2015.06.013

Cited by 23 publications

(10 citation statements)

References 35 publications

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“…In addition, Van der Waals forces and electrostatic interactions played an important role in the sorption of metal ions on adsorbents [ 40 ]. In contrast, the adsorption of metal cyanide complexes by GAC and Cu(BDC-NH 2 )(DMF) mainly depended on Van der Waals forces and electrostatic interactions, respectively [ 27 , 55 ]. Therefore, compared to GAC and pristine Cu(BDC-NH 2 )(DMF), higher adsorption capacities for the metal cyanide complexes were achieved using Et- N -Cu(BDC-NH 2 ) (DMF) as the adsorbent.…”

Section: Resultsmentioning

confidence: 99%

Highly Effective Removal of Metal Cyanide Complexes and Recovery of Palladium Using Quaternary-Ammonium-Functionalized MOFs

et al. 2018

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In this study, quaternary-ammonium-functionalized metal–organic frameworks (MOFs) Et-N-Cu(BDC-NH2)(DMF), were prepared, characterized, and applied for the highly effective removal of metal cyanide complexes, including Pd(CN)42−, Co(CN)63−, and Fe(CN)63−. Batch studies were carried out, and the maximum adsorption capacities of Pd(II), Co(III), and Fe(III) reached 172.9, 101.0, and 102.6, respectively. Adsorption was rapid, and equilibrium was established within 30 min. Et-N-Cu(BDC-NH2)(DMF) exhibited high thermal and chemical stability. Furthermore, absorbed Pd(CN)42− was selectively recovered by two-step elution. First, Co(CN)63− and Fe(CN)63− were eluted with a 1.5 mol L−1 KCl solution. Elution rates of Co(CN)63− and Fe(CN)63− were greater than 98.0%, whereas the elution percentage of Pd(CN)42− was less than 2.0%. Second, >97.0% Pd(CN)42− on the loaded MOFs was eluted using a 2.0 mol L−1 KI solution. The recovery rate of Pd(CN)42− was greater than 91.0% after five testing cycles. Adsorption isotherms, kinetics models, and adsorption thermodynamics of Pd(CN)42− on Et-N-Cu(BDC-NH2) (DMF) were also systematically investigated. The Et-N-Cu(BDC-NH2) (DMF) absorbent exhibited a rapid, excellent ability for the adsorption of metal cyanide complexes.

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Section: Resultsmentioning

confidence: 99%

Highly Effective Removal of Metal Cyanide Complexes and Recovery of Palladium Using Quaternary-Ammonium-Functionalized MOFs

et al. 2018

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“…It is noteworthy to mention that the traditional recovery of Pt and Pd from cyanide leach solutions has been carried out through adsorption with activated carbon and reductive precipitation with zinc. [33][34][35][36] Due to a long adsorption duration with small sorption capacity and high elution temperature, activated carbon exhibited poor operating ability. 37 On the other side, a low Pt-Pd concentration in cyanide solution has presented the precipitation technique to be impractical.…”

Section: Introductionmentioning

confidence: 99%

Mobilization of platinum and palladium from exhausted catalytic converters using bio-cyanide and an ionic-liquid as mass transport carriers

2022

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“…Anode slimes are generally treated by systems such as cyanide [6], halide [7], and biotechnologies [8]. The noble metal ions in the leaching solution are separated by precipitation [9], activated carbon adsorption [10,11], ion exchange [12,13], and solvent extraction [14][15][16][17]. Among these methods, solvent extraction has been employed in commercial plants for a long time.…”

Section: Introductionmentioning

confidence: 99%

A Process for the Separation of Noble Metals from HCl Liquor Containing Gold(III), Palladium(II), Platinum(IV), Rhodium(III), and Iridium(IV) by Solvent Extraction

Xing

Lee

2019

Processes

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The demand for noble metals is increasing, owing to their excellent chemical and physical properties. In order to meet the demand, the recovery of noble metals with high purity from diverse secondary resources, which contain small amounts of noble metals, is of immense value. In this work, the possibility of the separation of Au(III), Pd(II), Pt(IV), Rh(III), and Ir(IV) by solvent extraction from a synthetic HCl solution is investigated. Only Au(III) was selectively extracted by Cyanex 272 in the HCl concentration range from 0.5 M to 9 M, leaving the other metal ions in the raffinate. The loaded Au(III) in Cyanex 272 was efficiently stripped by (NH2)2CS. The other four noble metals were sequentially separated on the basis of the procedures reported in the previous work. The mass balance showed that about 98% of each metal, except Pt(IV), was recovered by the proposed process. An efficient process for the recovery of the five noble metal ions from the HCl leaching solution of secondary resources containing these metals can be developed.

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Factors affecting the elution of Pt, Pd and Au cyanide from activated carbon

Cited by 23 publications

References 35 publications

Highly Effective Removal of Metal Cyanide Complexes and Recovery of Palladium Using Quaternary-Ammonium-Functionalized MOFs

Highly Effective Removal of Metal Cyanide Complexes and Recovery of Palladium Using Quaternary-Ammonium-Functionalized MOFs

Mobilization of platinum and palladium from exhausted catalytic converters using bio-cyanide and an ionic-liquid as mass transport carriers

A Process for the Separation of Noble Metals from HCl Liquor Containing Gold(III), Palladium(II), Platinum(IV), Rhodium(III), and Iridium(IV) by Solvent Extraction

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