Noble Metals and Spinel Settling in High Level Waste Glass Melters

Sundaram, S K; Perez, Joseph Manuel Sr

doi:10.2172/965224

Cited by 10 publications

(10 citation statements)

References 19 publications

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“…Recovery of palladium from HLLW may, therefore, provide appreciable incentives in view of its growing and widespread applications in various chemical, pharmaceutical, and electronic industries. Furthermore, the separation of palladium from waste could also indirectly exclude some problems associated with vitrification of waste prior to long-term disposal (2,6).…”

Section: Please Scroll Down For Articlementioning

confidence: 99%

N,N,N′,N′-Tetra(2-Ethylhexyl) Thiodiglycolamide T(2EH)TDGA: A Promising Ligand for Separation and Recovery of Palladium from High Level Liquid Waste (HLLW) Solutions

Ruhela

Sharma

Tomar

et al. 2011

Separation Science and Technology

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The extraction properties of N,N,N 0 ,N 0 -tetra(2-ethylhexyl)thiodiglycolamide T(2EH)TDGA have been evaluated for the separation and recovery of palladium from simulated high-level liquid waste (SHLW). T(2EH)TDGA has shown very high selectivity for Pd (II) over other metal ions present in SHLW. The separation factor (SF) for Pd (II) over other metal ions was found to be more than 10 5 . Reusability studies of the extractant indicate that D Pd remained almost constant even after five successive cycles of extraction and stripping. Palladium was quantitatively recovered from thiourea strip solution by treating it with ammonia and filtering the precipitate of palladium sulphide. The acid uptake constant (K H ) was found to be 0.62 which could be due to the presence of two carbonyl groups of amidic moiety. To account for very high extractability of palladium with T(2EH)TDGA over other 'S' donor extractants, namely Bis-(2-ethylhexyl)sulphoxide (BESO), FTIR, as well as Raman studies were carried out. FTIR and Raman studies suggested the ligation through carbonyl as well as the thio-ether group. Conditional extraction constants (log K 0 ex ) were determined and the thermodynamic parameters were calculated from the dependence of the conditional extraction constant (log K 0 ex ) on temperature. The calculated values of DG ex , DH ex , and DS ex were À41.78 kJmol À1 , À55.12 kJmol À1 and À44.04 JK À1 mol À1 respectively. The extraction process is indicated to be enthalpy driven with the entropy factor counteracting it.

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Section: Please Scroll Down For Articlementioning

confidence: 99%

N,N,N′,N′-Tetra(2-Ethylhexyl) Thiodiglycolamide T(2EH)TDGA: A Promising Ligand for Separation and Recovery of Palladium from High Level Liquid Waste (HLLW) Solutions

Ruhela

Sharma

Tomar

et al. 2011

Separation Science and Technology

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show abstract

“…Therefore, there is an increasing interest towards recovering these metal ions from HLW. Furthermore, the separation of PGMs from waste could also indirectly exclude some problems associated with vitrification prior to long term disposal [5,6].…”

Section: Introductionmentioning

confidence: 99%

Facilitated transport of Pd(II) through a supported liquid membrane (SLM) containing N,N,N′,N′-tetra-(2-ethylhexyl) thiodiglycolamide T(2EH)TDGA: A novel carrier

Ruhela

Panja

Sharma

et al. 2012

Journal of Hazardous Materials

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“…This is described in another report (Sundaram and Perez, 2000). The electrical response of the West Valley melter, after gradually declining, remained fairly constant and operation continued.…”

Section: -2mentioning

confidence: 78%

“…Two reports (Smith and Bickford, 1997;Sundaram and Perez, 2000) are particularly thorough and more extensive than this report is intended to be. Readers of this document are strongly encouraged to consult those works for further background.…”

Section: -4mentioning

confidence: 94%

“…Samples taken from the bottom of the melter at the end of the run had high concentrations of noble metals, some 20 to 45 times higher than those of the nominal glass. Near the end of the run, the electrical resistance between the lower set of electrodes decreased by 10 -15 %, further indicating a settled layer of noble metals (Sundaram and Perez, 2000).…”

Section: Noble Metals Testing In the Pnnl Engineering Scale Melter (Esm)mentioning

Noble Metals and Spinel Settling in High Level Waste Glass Melters

Cited by 10 publications

References 19 publications

N,N,N′,N′-Tetra(2-Ethylhexyl) Thiodiglycolamide T(2EH)TDGA: A Promising Ligand for Separation and Recovery of Palladium from High Level Liquid Waste (HLLW) Solutions

N,N,N′,N′-Tetra(2-Ethylhexyl) Thiodiglycolamide T(2EH)TDGA: A Promising Ligand for Separation and Recovery of Palladium from High Level Liquid Waste (HLLW) Solutions

Facilitated transport of Pd(II) through a supported liquid membrane (SLM) containing N,N,N′,N′-tetra-(2-ethylhexyl) thiodiglycolamide T(2EH)TDGA: A novel carrier

Letter Report on the Issue of Noble Metals in the DWPF Melter

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