Separation of platinum and rhodium from chloride solutions containing aluminum, magnesium and iron using solvent extraction and precipitation methods

Raju, B. David; Kumar, J. Rajesh; Lee, Jin Young; Kwonc, Hyuk-Sung; Kantam, M. Lakshmi; Reddy, B. S. R.

doi:10.1016/j.jhazmat.2012.05.025

Cited by 57 publications

(23 citation statements)

References 29 publications

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“…However, the links between chemical speciation and the bioavailability of PGMs in aquatic environments remains to be elucidated due to the lack of reliable basic thermodynamic data . The separation and purification of PGMs from their solutions is one of the most difficult areas in precious metal refining, mainly due to their complex solution chemistry , . Solvent extraction is a promising separation technique based on the control of the type of metal species in the aqueous phase in the presence of some additives .…”

Section: Introductionmentioning

confidence: 99%

Aquanitrato Complexes of Palladium, Rhodium, and Platinum: A Comparative¹⁵N NMR and DFT Study

2018

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The accurate prediction of 15N nuclear magnetic resonance (NMR) chemical shifts for three sets of nitrato and mixed‐ligand aquanitrato rhodium (9 complexes), palladium (11 complexes) and platinum (11 complexes) systems was achieved using density functional theory (DFT) calculations employing the GIAO‐PBE0/ADZP(M)∪6‐31+G(d)(E)/PCM (M = Rh, Pd, or Pt, E = main group element) computational protocol. A comparison of δcalcd 15N NMR chemical shifts with δexptl 15N NMR chemical shifts reveals that the DFT calculations correctly predict the division of signals into two groups, the first one involving the PdII, PtII, and RhIII nitrato complexes, and the second the PtIV and PdIV nitrato complexes. Hydrogen bonds and the number of nitrato ligands and their coordination mode remarkably affect the δcalcd 15N chemical shift. Generally, the experimentally observed chemical shifts are found in a sufficiently narrower range for each metal center in comparison to the calculated ones due to an averaging action of the outer‐sphere interactions of complexes with external molecules of water and nitric acid.

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Section: Introductionmentioning

confidence: 99%

Aquanitrato Complexes of Palladium, Rhodium, and Platinum: A Comparative¹⁵N NMR and DFT Study

2018

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“…Since 2000, researchers have been trying to develop various technologies to recover valuable materials [11][12]. Numerous investigators have studied methods to recover valuable metals from solutions using chemical precipitation followed by solvent extraction [13][14][15]; some others have attempted to separate indium from other waste by adjusting the pH value of the solution. However, due to the recovery ratio, these traditional approaches have disadvantages when the concentration of precious metals is low in solution; and high energy requirements.…”

Section: Introductionmentioning

confidence: 99%

Effect of Acid Dissolution Conditions on Recovery of Valuable Metals from Used Plasma Display Panel Scrap

Kim

Dharmaiah

Kim

et al. 2017

Archives of Metallurgy and Materials

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The objective of this particular study was to recover valuable metals from waste plasma display panels using high energy ball milling with subsequent acid dissolution. Dissolution of milled (PDP) powder was studied in HCl, HNO 3 , and H 2 SO 4 acidic solutions. The effects of dissolution acid, temperature, time, and PDP scrap powder to acid ratio on the leaching process were investigated and the most favorable conditions were found: (1) valuable metals (In, Ag, Mg) were recovered from PDP powder in a mixture of concentrated hydrochloric acid (HCl:H 2 O = 50:50); (2) the optimal dissolution temperature and time for the valuable metals were found to be 60°C and 30 min, respectively; (3) the ideal PDP scrap powder to acid solution ratio was found to be 1:10. The proposed method was applied to the recovery of magnesium, silver, and indium with satisfactory results.

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“…, trihexyl(tetradecyl) phosphonium [1], dibutyl sulfoxide (DBSO) [11] and 2-hydroxy-4-sec-octanoyl diphenyl-ketoxime [12] allow the selective extraction of Pd(II) over Pt(IV), Rh(III) and other metals from chloride solutions. Meanwhile, Pt(IV) has been preferentially extracted from hydrochloric acid solution in the presence of Rh(III)/Pd(II)/Ir(III) by a mixture of four trialkyl phosphine oxides (Cyanex 923) [13], tri-isobutylphosphine sulphide (Cyanex 471) [14], quaternary ammonium salt (Aliquat 336) [15,16], 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC 88A) [17] and tri-n-octyl amine (Alamine 300) [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of HCl Concentration on the Oxidation of LIX 63 and the Subsequent Separation of Pd(II), Pt(IV), Ir(IV) and Rh(III) by Solvent Extraction

Nguyen¹,

Lee²

2016

Korean J. Met. Mater.

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During the selective extraction of Pd(II) by LIX 63 from 6 M HCl solutions containing platinum group metals, an oxidation-reduction reaction occurs between the LIX 63 and Ir(IV). Since the reduced Ir(III) cannot be extracted by solvating and amine extractants, the oxidation-reduction reaction has a significant effect on the separation of Pt(IV), Ir(IV) and Rh(III). Therefore, the effect of HCl concentration on the reduction of Ir(IV) during the extraction with LIX 63 was investigated at 3 and 6 M HCl solutions. The extraction behavior of Iridium by Aliquat 336 from the Pd(II) free raffinate showed that the percentage of iridium extraction rapidly decreased when HCl concentration was increased from 3 to 6 M, indicating that more Ir(IV) was reduced to Ir(III). Extraction schemes for the separation of Pt(IV), iridium and Rh(III) by Aliquat 336 from 3 and 6 M HCl solutions were investigated. † (

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Separation of platinum and rhodium from chloride solutions containing aluminum, magnesium and iron using solvent extraction and precipitation methods

Cited by 57 publications

References 29 publications

Aquanitrato Complexes of Palladium, Rhodium, and Platinum: A Comparative¹⁵N NMR and DFT Study

Aquanitrato Complexes of Palladium, Rhodium, and Platinum: A Comparative¹⁵N NMR and DFT Study

Effect of Acid Dissolution Conditions on Recovery of Valuable Metals from Used Plasma Display Panel Scrap

Effect of HCl Concentration on the Oxidation of LIX 63 and the Subsequent Separation of Pd(II), Pt(IV), Ir(IV) and Rh(III) by Solvent Extraction

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Separation of platinum and rhodium from chloride solutions containing aluminum, magnesium and iron using solvent extraction and precipitation methods

Cited by 57 publications

References 29 publications

Aquanitrato Complexes of Palladium, Rhodium, and Platinum: A Comparative15N NMR and DFT Study

Aquanitrato Complexes of Palladium, Rhodium, and Platinum: A Comparative15N NMR and DFT Study

Effect of Acid Dissolution Conditions on Recovery of Valuable Metals from Used Plasma Display Panel Scrap

Effect of HCl Concentration on the Oxidation of LIX 63 and the Subsequent Separation of Pd(II), Pt(IV), Ir(IV) and Rh(III) by Solvent Extraction

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Aquanitrato Complexes of Palladium, Rhodium, and Platinum: A Comparative¹⁵N NMR and DFT Study

Aquanitrato Complexes of Palladium, Rhodium, and Platinum: A Comparative¹⁵N NMR and DFT Study