Physiochemical Properties of Gamma-Irradiated Tri-iso-amyl Phosphate–Dodecane System: Effect of Aqueous Phase Acidity

2019 ◽  
Vol 37 (6) ◽  
pp. 446-460
Author(s):  
Satyabrata Mishra ◽  
N. K. Pandey
Keyword(s):  
Aqueous Phase ◽  
System Effect ◽  
Physiochemical Properties ◽  
Aqueous Phase Acidity ◽  
Gamma Irradiated

Recovery of Sc3+ from Red Mud Leaching Solution by Emulsion Liquid Membrane

2011 ◽  
Vol 335-336 ◽  
pp. 1465-1468 ◽  
Author(s):  
Cui Zhen Wang ◽  
Guang Zhu Zhou ◽  
Xiao Yan Kou ◽  
Zi Long Zheng
Keyword(s):  
Optimum Condition ◽  
Aqueous Phase ◽  
Red Mud ◽  
Surfactant Concentration ◽  
Liquid Membrane ◽  
Emulsion Liquid Membrane ◽  
Mobile Carrier ◽  
Aqueous Phase Acidity ◽  
Leaching Solution ◽  
Sulfonated Kerosene

In this paper, recovery of scandium from red mud leaching solution by emulsion liquid membrane (ELM) was studied. Composition of ELM is P507+ span80 + sulfonated kerosene + HCl. Effects of mobile carrier and surfactant concentration, Roi, Rwe, internal and external aqueous phase acidity on the extracting rate of Sc3+were studied. Results show that it is feasible for ELM extracting Sc3+from the red mud leaching solution. The optimum condition for ELM extracting scandium from the red mud is P507%=8%, Span80%=7%, Roi=2:3, Rwe=6, internal aqueous c(HCl)=2 mol/L, external aqueous phase pH=2. The extracting rate of Sc3+can reach to 98% under optimal condition.

Preparation of U(VI) and Th(IV) α-sources from calcium nitrate solutions by combining solvent extraction and electrodeposition procedures

2002 ◽  
Vol 90 (5) ◽  
Author(s):  
A. Elyahyaoui ◽  
R. Zarki ◽  
A. Chiadli
Keyword(s):  
Solvent Extraction ◽  
Aqueous Phase ◽  
Nitrate Solution ◽  
Calcium Nitrate ◽  
Spectrometric Analysis ◽  
Simple Method ◽  
Aqueous Phase Acidity ◽  
Source Preparation ◽  
Ph Range ◽  
Nitrate Solutions

SummaryA simple method of preparing α-sources for alpha spectrometric analysis of uranium and thorium is investigated by combining solvent extraction and electrodeposition procedures. Extraction of these actinides is performed by diethyl ether from calcium nitrate solution with various nitric acid concentrations. Recoveries of 90–100% are obtained for uranium and 83.5% for thorium. Good resolutions are also achieved under optimum conditions.The dependence of the overall yield of U(VI) and Th(IV) is examined in relation to the aqueous phase acidity. A procedure combining solvent extraction and electrodeposition is proposed for a selective α-source preparation of U(VI) and Th(IV). Uranium is first extracted at pH range about 1 to 2. At this acidity, thorium remains in the aqueous phase and may be subsequently extracted from this after acidification with 2 M HNO

Tailored activated carbon from glycerol: role of acid dehydrator on physiochemical characteristics and adsorption performance

2017 ◽  
Vol 5 (32) ◽  
pp. 16812-16821 ◽  
Author(s):  
Yanbin Cui ◽  
John D. Atkinson
Keyword(s):  
Activated Carbon ◽  
Aqueous Phase ◽  
Physiochemical Properties ◽  
Adsorption Performance

H2SO4- and H3PO4-mediated glycerol carbonization and activation produces activated carbon with tailored physiochemical properties for gas and aqueous phase adsorption.

Extraction of Scandium from Red Mud Using ELM with P204 as Carrier

2012 ◽  
Vol 602-604 ◽  
pp. 1116-1119
Author(s):  
Cui Zhen Wang ◽  
Guang Zhu Zhou ◽  
Zi Long Zheng
Keyword(s):  
Aqueous Phase ◽  
Red Mud ◽  
Surfactant Concentration ◽  
Earth Element ◽  
Liquid Membrane ◽  
Social Issues ◽  
Mobile Carrier ◽  
Aqueous Phase Acidity ◽  
Leaching Solution ◽  
Sulfonated Kerosene

Scandium is an important rare earth element. Stacking of red mud has caused serious environmental and social issues. Red mud is rich in scandium. In this paper, recovery of scandium from red mud by emulsion liquid membrane (ELM) was studied. Composition of ELM is P204-Span80-sulfonated kerosene-HCl. Effects of mobile carrier and surfactant concentration, Roi, Rwe, internal and external aqueous phase acidity on the extracting rate of Sc3+ were studied. Results show that it is feasible for P204-Span80-Sulfonated Kerosene-HCl ELM System extracting Sc3+ from red mud leaching solution. The optimum condition is P204=12%, Span80=3%, Roi= 2:3, Rwe=6, the internal aqueous c(HCl)= 4mol/L, the external aqueous phase pH=2, the time of making emulsion is 20 minutes, extracting time is 15 minutes. The extracting rate of Sc3+ can reach to 99.6% under optimal condition. The extracting rate of other impurities is lower than 5%.

Aqueous Phase Diffusion in Crystalline Rock

1981 ◽  
Vol 11 ◽  
Author(s):  
M.H. Bradbury ◽  
D. Lever ◽  
D. Kinsey
Keyword(s):  
Radioactive Waste ◽  
Aqueous Phase ◽  
Water Movement ◽  
Degradation Products ◽  
Crystalline Rock ◽  
Crystalline Rocks ◽  
Radionuclide Transport ◽  
Fracture Networks ◽  
Phase Diffusion ◽  
Main Factors

One of the options being considered for the disposal of radioactive waste is deep burial in crystalline rocks such as granite. It is generally recognised that in such rocks groundwater flows mainly through the fracture networks so that these will be the “highways” for the return of radionuclides to the biosphere. The main factors retarding the radionuclide transport have been considered to be the slow water movement in the fissures over the long distances involved together with sorption both in man-made barriers surrounding the waste, and onto rock surfaces and degradation products in the fissures.

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