Multiparametric study of thorium oxide dissolution in aqueous media

2016 ◽  
Vol 104 (10) ◽  
Author(s):  
Marie Simonnet ◽  
Nicole Barré ◽  
Romuald Drot ◽  
Claire Le Naour ◽  
Vladimir Sladkov ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Uranium Oxide ◽  
Aqueous Media ◽  
Nitric Acid Medium ◽  
Dissolution Medium ◽  
Dissolution Method ◽  
Oxide Dissolution ◽  
Thorium Oxide ◽  
Poorly Soluble ◽  
Total Dissolution

AbstractThorium oxide is poorly soluble: unlike uranium oxide, concentrated nitric acid medium is not sufficient to get quantitative dissolution. Addition of small amounts of fluoride is required to achieve thorium oxide total dissolution. The effect of several parameters on thorium oxide dissolution in order to optimize the dissolution conditions is reported in this paper. Thus the influence of solid characteristics, dissolution method, temperature and composition of dissolution medium on ThO

scholarly journals Nitration of Jharia basin coals, India: a study of structural modifications by XRD and FTIR techniques

2021 ◽  
Author(s):  
Prabal Boral ◽  
Atul K. Varma ◽  
Sudip Maity
Keyword(s):  
Acetic Acid ◽  
Nitric Acid ◽  
Linear Relationship ◽  
Glacial Acetic Acid ◽  
Vitrinite Reflectance ◽  
Aqueous Media ◽  
Interlayer Spacing ◽  
Acetic Acid Medium ◽  
X Ray ◽  
The Media

AbstractFour coal samples from Jharia basin, India are treated with nitric acid in glacial acetic acid and aqueous media to find out the chemical, petrographic and spatial structure of the organic mass by X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR) techniques. X-ray parameters of coal like interlayer spacing (d002), crystallite size (Lc), aroamticity (fa), average number of aromatic layers (Nc), and coal rank (I26/I20) have been determined using profile-fitting software. Considerable variation is observed in treated coals in comparison to the demineralized coals. The d002 values of treated coals have increased in both the media showing increase in disordering of organic moieties. A linear relationship has been observed between d002 values with the volatile matter of the coals. Similarly, the d002 values show linear relationship with Cdmf contents for demineralized as well as for the treated coals in both the media. The Lc and Nc values have decreased in treated coals corresponding to demineralized coals. The present study shows that nitration in both the media is capable of removing the aliphatic side chains from the coals and aromaticity (fa) increases with increase in rank and shows a linear relationship with the vitrinite reflectance. The corresponding I26/I20 values are least for treated coals in glacial acetic acid medium followed by raw and then to treated coals in aqueous medium. FTIR studies show that coal arenes of the raw coals are converted into nitro-arenes in structurally modified coals (SMCs) in both the media, the corresponding bands at 1550–1490 and 1355–1315 cm−1 respectively. FTIR study confirms that nitration is the predominant phenomenon, though, oxidation and nitration phenomena takes place simultaneously during treatment with nitric acid to form SMCs. In comparison to raw coals, the SMCs show higher aromaticity and may be easily converted to coal derived products like activated carbon and specialty carbon materials.

Syntheses and evaluation of new hydrophilic azacryptands used as masking agents of technetium in solvent extraction processes

2021 ◽  
Vol 50 (5) ◽  
pp. 1620-1630
Author(s):  
Alexiane Thevenet ◽  
Ana Miljkovic ◽  
Sonia La Cognata ◽  
Cécile Marie ◽  
Christelle Tamain ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Acid Medium ◽  
Separation Process ◽  
Nitric Acid Medium ◽  
Masking Agents ◽  
Extraction Processes

New azacryptands with the addition of hydrophilic groups were synthesized to bind selectively the pertechnetate anion in nitric acid medium, and avoid its extraction in the separation process.

Extraction and stripping behaviors of 14 lanthanides from nitric acid medium by N,N’-dimethyl-N,N’-dioctyl diglycolamide

2020 ◽  
Vol 325 (2) ◽  
pp. 409-416
Author(s):  
Yaoyang Liu ◽  
Chuang Zhao ◽  
Zhibin Liu ◽  
Yu Zhou ◽  
Caishan Jiao ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Acid Medium ◽  
Nitric Acid Medium

Thorium Oxide and Uranium Oxide Cleavage

1959 ◽  
Vol 42 (5) ◽  
pp. 262-262 ◽  
Author(s):  
WILLIAM B CAMPBELL ◽  
VERNON J. HURST ◽  
WILLIS E. MOODY
Keyword(s):  
Uranium Oxide ◽  
Thorium Oxide

Extraction behaviour of Am(III) and Eu(III) from nitric acid medium in CMPO-HDEHP impregnated resins

2015 ◽  
Vol 0 (0) ◽  
Author(s):  
K. Saipriya ◽  
R. Kumaresan ◽  
P. K. Nayak ◽  
K. A. Venkatesan ◽  
T. Kumar ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Acid Medium ◽  
Nitric Acid Medium ◽  
Extraction Behaviour ◽  
Chromatographic Resin

AbstractChromatographic resin containing extractants such as octyl(phenyl)-

Separation of Ruthenium from Simulated Nuclear Waste in Nitric Acid Medium using n-Paraffin Hydrocarbon

2013 ◽  
Vol 49 (1) ◽  
pp. 112-120 ◽  
Author(s):  
Pravati Swain ◽  
S. Annapoorani ◽  
R. Srinivasan ◽  
C. Mallika ◽  
U. Kamachi Mudali ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Acid Medium ◽  
Nuclear Waste ◽  
Paraffin Hydrocarbon ◽  
Nitric Acid Medium
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