The effect of temperature, cyanide and base metals on the adsorption of Pt, Pd and Au onto activated carbon

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

doi:10.1016/j.hydromet.2014.07.012

Cited by 31 publications

(15 citation statements)

References 37 publications

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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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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 second step involves pressure cyanide leaching, in which palladium and platinum are extracted from the concentrate residue . Typically, activated carbon adsorption, Merrill‐Crowe zinc precipitation and ion‐exchangeare employed for the extraction and recovery of Pd(CN) 4 2‐ and Pt(CN) 4 2‐ from alkaline cyanide liquors. Activated carbon adsorption exhibits advantages of high effectiveness and treatment of very dilute leaching liquor.…”

Section: Introductionmentioning

confidence: 99%

“…The content of palladium and platinum in Cu–Ni sulfide ores is less than 10 g t −1 in Jinbaoshang . Hence, the palladium and platinum content in leaching liquors is low, and the direct cementation of zinc powder is not suitable for leaching liquors . Besides, ion exchange exhibits low selectivity in the presence of other coexisting impurity metal ions, and the product must be further refined by a lengthy procedure .…”

Section: Introductionmentioning

confidence: 99%

“…12 Hence, the palladium and platinum content in leaching liquors is low, and the direct cementation of zinc powder is not suitable for leaching liquors. 8 Besides, ion exchange exhibits low selectivity in the presence of other coexisting impurity metal ions, and the product must be further refined by a lengthy procedure. 11 Hence, it is imperative to develop an effective, cost-effective process for separation and recovery of palladium and platinum from cyanide liquors of Pd-Pt flotation concentrate.…”

Section: Introductionmentioning

confidence: 99%

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Separation and recovery of Pd(II) and Pt(II) from cyanide liquors of Pd-Pt flotation concentrate via solvent extraction

Chen

Huang

et al. 2017

J. Chem. Technol. Biotechnol

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BACKGROUND Thus far, separation and recovery of Pd(CN)42‐ and Pt(CN)42‐ from cyanide liquors have not been reported. In this study, the process of co‐extracting and separating Pd(II) and Pt(II) over Fe(III), Cu(I), Co(III), and Ni(I) from alkaline cyanide liquors was investigated. RESULTS The results showed that almost all Pd(II) and Pt(II) (>98.0%) could be simultaneously extracted by phenoxyethyl dimethyl palmitylammonium bromide (PDPB), whereas Fe(III), Cu(I), Co(III), and Ni(I) was below 3.0% under optimum conditions. Furthermore, Pd(CN)42‐ and Pt(CN)42‐ were separated and recovered by the two‐step stripping process. First, Pd(CN)42‐ in mixed organic phase was stripped by a 2.0 mol L−1 ammonium thiocyanate solution. The stripping percentage of Pd(CN)42‐ was >98%, whereas the stripped Pt(CN)42‐ was below 1%. Second, more than 97.5% Pt(CN)42‐ in the loaded organic phase could be stripped using 1.0 mol L−1 thiodiglycol solution. Recovery ratios for both Pd(II) and Pt(II) were above 95%. The organic phase could be reused for at least 6 cycles of extraction–stripping processes. The mechanisms of extraction reaction were deduced to be ion‐association mechanisms. CONCLUSION The process could be applied for extracting and separating palladium and platinum from the cyanide leaching liquor of the flotation concentrate. © 2016 Society of Chemical Industry

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“…After 304 days 75% Ni and 93% Cu were extracted in the bioleach experiment at 65°C, and after 60 days 58% Pt, 99% Pd and 90% Au in the follow-up cyanide leach experiment at 50°C. PGM cyanide complexes can, in principle, be upgraded or recovered from solution using various approaches, such as Merrill-Crowe cementation (Mpinga et al, 2014a), adsorption onto activated carbon (Mpinga et al, 2014b;Snyders et al, 2012Snyders et al, , 2013Snyders et al, , 2014a, and using ion-exchange resins (Schoeman et al, 2012). The adsorption of the PGM cyanide complexes onto activated carbon has, in particular, received a fair bit of attention (Mpinga et al, 2014b;Snyders et al, 2013;Snyders et al, 2014a,b;Aguilar et al, 1997;Roijals et al, 1996;Desmond et al, 1991) and has proved to be a feasible option.…”

Section: Introductionmentioning

confidence: 99%

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

Snyders

Bradshaw

Akdogan

et al. 2015

Minerals Engineering

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The effect of temperature, cyanide and base metals on the adsorption of Pt, Pd and Au onto activated carbon

Cited by 31 publications

References 37 publications

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

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

Separation and recovery of Pd(II) and Pt(II) from cyanide liquors of Pd-Pt flotation concentrate via solvent extraction

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

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