Extraction of palladium(II) from nitric acid solutions with diglycolthioamide

Huang, Huang; Huang, Chao; Wu, Yuxuan; Ding, Songdong; Liu, Ning; Su, Dongping; Lv, Tianhao

doi:10.1016/j.hydromet.2015.05.002

Cited by 41 publications

(18 citation statements)

References 22 publications

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“…Mole ratio method is also used to discuss the extraction mechanism. This method is based upon considerations of a type of reaction as follows: represents the mole ratio in the product [30,34,35].…”

Section: Mole Ratio Methodsmentioning

confidence: 99%

Selective extraction of americium(III) over europium(III) ions in nitric acid solution by NTAamide(C8) using a novel water-soluble bisdiglycolamide as a masking agent

Wang

Ding

et al. 2017

Separation and Purification Technology

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A novel water-soluble ligand of N,bisdiglycolamide (TEE-BisDGA) was synthesized and used as a masking agent for selective extraction of Am(III) over Eu(III) from HNO3 solution by Nhexaoctylnitrilotriacetamide (NTAamide(C8)) in kerosene. Influences of acidity, concentration of water-soluble ligands and extractant on the distribution ratios (D) and separation factors (SF) of Am(III) and Eu(III) were investigated. In the range of examined acidity from 0.001 to 0.2 mol/L, DAm and DEu decreased with the increase of HNO3 concentration. Using 0.1 mol/L NTAamide(C8) as an extractant, the maximum SFAm/Eu of 26 can be obtained in the presence of 0.01 mol/L TEE-BisDGA in aqueous phase with pH of 3.0, which was significantly higher than that case with no TEE-BisDGA. Job's method and mole ratio method were employed for extraction mechanism research. It has been shown that Am(III) and Eu(III) formed di-solvated species with TEE-BisDGA and mono-solvated species with NTAamide(C8), © 2017. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ respectively. Moreover, the stability constants logβ values were obtained from UV-vis adsorption spectroscopic titration for Nd(III) complexes with TEE-BisDGA and N,N,N',N'-tetraethyldiglycolamide (TEDGA), which indicated that TEDGA had a stronger complex ability than TEE-BisDGA.

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Section: Mole Ratio Methodsmentioning

confidence: 99%

Selective extraction of americium(III) over europium(III) ions in nitric acid solution by NTAamide(C8) using a novel water-soluble bisdiglycolamide as a masking agent

Wang

Ding

et al. 2017

Separation and Purification Technology

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“…55 Pd(II) can be isolated by solvent-extraction techniques. 65,66 Gold was recovered as very thin yellow blades. XRF data show these blades contain minor amounts of silicon (< 0.1 wt.%).…”

Section: Gray Solid (Hf + H 2 O 2 Mixtures)mentioning

confidence: 99%

Recovery of Lead and Noble Metals After Processing Printed Circuit Boards From Cell Phones by Leaching With Mixtures Containing Hydrogen Fluoride

Silva¹,

Corrêa²,

Gismonti³

et al. 2018

Quim. Nova

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This work examines the leaching of printed circuit boards (PCBs) from cell phones in aqueous solutions containing HF + H 2 O 2 or HF + NaClO under mild experimental conditions. The PCBs were not ground but were previously treated with 6 mol L -1 NaOH at 50 o C for 1 h to remove their soldering mask. , respectively. The processing of the solid residue is also described in detail. It was leached with water at ~90 o C followed by HNO 3aq. at 25 o C. Lead, palladium and silver were recovered in this order, leaving gold as final solid. After 1 h at [35][36][37][38][39][40] o C, 5 mol L -1 HF + 0.3 mol L -1 NaClO mixtures leached the base metals, copper, gold and palladium. Gold was recovered by liquid-liquid extraction with methyl isobutyl ketone. Silver precipitated as chloride. This salt was isolated by leaching with NH 3aq . Loss of fluoride ions (as HF) was below 0.5 wt.% after leaching and handling the solid residue.

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“…The data on palladium extraction from nitrate solutions with hydroxyoximes, diglycolthioamides, and malonamides have been reported. [2][3][4] Shmidt et al [5] studied the extraction of palladium from nitric acid solutions by tri-n-butyl and triisoamylphosphine oxides and showed that the extraction ability of the phosphine oxides is not very high. It was shown that diphosphine oxides, in their extraction ability, far exceed the monodentate organophosphorus extractants, such as trioctylphosphine oxide and tributyl phosphate.…”

Section: Introductionmentioning

confidence: 99%

Palladium Extraction from Nitrate Solutions with the Disulfide of Bis(2,4,4‐trimethylpentyl)dithiophosphinic Acid

2020

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This work presents data on palladium recovery from nitrate solutions with the disulfide of bis(2,4,4‐trimethylpentyl)dithiophosphinic acid (L) in toluene. Extraction of palladium with the disulfide is slow but it increases as the concentration of L in the organic phase increases. At a concentration of L equal to 0.01 mol/L, almost complete extraction of palladium (99.7 %) is achieved within 20 minutes. The extraction efficiency also increases with increasing temperature. Maximum palladium recovery occurs at an HNO3 concentration of 1.0 mol/L in the aqueous phase. Analysis of the interphase palladium distribution showed that the extraction of palladium with the disulfide in toluene is due to the formation of the complexes of variable composition [(Pd(NO3)2)n⋅L] in the organic phase where n=1–4. The disulfide can be used to recover palladium from nitric acid solutions containing metal impurities. The degree of palladium extraction in one‐stage is 98.2 %, therefore the extractant is highly selective toward Pd(II) in the presence of Ni(II), Cu(II), Co(II), Zn(II), and Fe(III). Almost complete palladium stripping from the organic phase is achieved with a mixture of thiourea and hydrochloric acid solutions.

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Extraction of palladium(II) from nitric acid solutions with diglycolthioamide

Cited by 41 publications

References 22 publications

Selective extraction of americium(III) over europium(III) ions in nitric acid solution by NTAamide(C8) using a novel water-soluble bisdiglycolamide as a masking agent

Selective extraction of americium(III) over europium(III) ions in nitric acid solution by NTAamide(C8) using a novel water-soluble bisdiglycolamide as a masking agent

Recovery of Lead and Noble Metals After Processing Printed Circuit Boards From Cell Phones by Leaching With Mixtures Containing Hydrogen Fluoride

Palladium Extraction from Nitrate Solutions with the Disulfide of Bis(2,4,4‐trimethylpentyl)dithiophosphinic Acid

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