scholarly journals Americium Recovery from Highly Active PUREX Raffinate by Solvent Extraction: The EXAm Process. A Review of 10 Years of R&D

2020 ◽  
Vol 38 (4) ◽  
pp. 365-387 ◽  
Author(s):  
Manuel Miguirditchian ◽  
Vincent Vanel ◽  
Cécile Marie ◽  
Vincent Pacary ◽  
Marie-Christine Charbonnel ◽  
...  
2020 ◽  
Vol 10 (8) ◽  
pp. 2343-2352
Author(s):  
Ziheng Zhen ◽  
Wenxiang Tang ◽  
Wei (Willy) Chu ◽  
Tao Zhang ◽  
Li Lv ◽  
...  

A new strategy for the preparation of dual site catalysts is introduced, which combines microemulsion technology and anti-solvent extraction technology.


2018 ◽  
Vol 106 (2) ◽  
pp. 95-106 ◽  
Author(s):  
Chris J. Maher ◽  
Christine Bouyer ◽  
Tamara L. Griffiths ◽  
Solène Legand ◽  
Gilles Leturcq ◽  
...  

AbstractThe dissolution of uranium or uranium-plutonium carbide fuel in nitric acid leads to ~50% carbon evolved as carbon dioxide, the remainder remains in the solution as soluble organics. These dissolved organic molecules interfere with the solvent extraction of uranium and plutonium by complexing to the actinide ions and decreasing the efficiency of their extraction. Experiments reported here describe two series of experiments assessing the uranium carbide dissolution liquor treatment by prolonged boiling and electrochemical oxidation. Plutonium losses to aqueous and solvent raffinates are observed for untreated liquors, highlighting that mineralisation of dissolved organics is necessary to reduce the complexing effects of organic acids to an extent that permit efficient operation of a solvent extraction process both in the first solvent use (considered here) and for maintaining solvent quality during industrial solvent reuse in the highly active cycle. Solution carbon analysis and 30% TBP solvent extraction batch tests of uranium and plutonium originating from dissolved uranium carbide liquors untreated and after treatment are compared. These experiments demonstrate the reprocessing of uranium carbides by direct dissolution coupled to a mineralisation process, can achieve near quantitative uranium and high plutonium recoveries (99.9%).


2018 ◽  
Vol 36 (6) ◽  
pp. 519-541 ◽  
Author(s):  
Peter Zsabka ◽  
Karen Van Hecke ◽  
Lesley Adriaensen ◽  
Andreas Wilden ◽  
Giuseppe Modolo ◽  
...  

Author(s):  
Alicja Urbaniak ◽  
Anna Skarpańska-Stejnborn

Abstract. The aim of the study was to review recent findings on the use of POM supplements in athletes of various disciplines and physically active participants. Eleven articles published between 2010 and 2018 were included, where the total number of investigated subjects was 176. Male participants constituted the majority of the group (n = 155), as compared to females (n = 21). 45% of research described was conducted on athletes, whereas the remaining studies were based on highly active participants. Randomised, crossover, double-blind study designs constituted the majority of the experimental designs used. POM supplementation varied in terms of form (pills/juice), dosage (50 ml–500 ml) and time of intervention (7 days–2 months) between studies. Among the reviewed articles, POM supplementation had an effect on the improvement of the following: whole body strength; feeling of vitality; acute and delayed muscle fatigue and soreness; increase in vessel diameter; blood flow and serum level of TAC; reduction in the rate of increase for HR, SBP, CK and LDH; support in the recovery of post-training CK, LDH, CRP and ASAT to their baseline levels; reduction of MMP2, MMP9, hsCRP and MDA; and increased activity of antioxidant enzymes (glutathione peroxidase and superoxide dismutase). In the majority of reviewed articles POM supplementation had a positive effect on a variety of parameters studied and the authors recommended it as a supplement for athletes and physically active bodies.


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