scholarly journals Thermal Decomposition Studies of the Ammonium Forms of the Crystalline Zirconium Phosphate Ion Exchanger

1973 ◽  
Vol 46 (10) ◽  
pp. 3296-3297 ◽  
Author(s):  
Yoshitsugu Hasegawa
Keyword(s):  
Thermal Decomposition ◽  
Zirconium Phosphate ◽  
Ion Exchanger ◽  
Phosphate Ion

scholarly journals Column Separation of Am(III) and Eu(III) by α-Zirconium Phosphate Ion Exchanger in Nitric Acid

2020 ◽  
Vol 4 (1) ◽  
pp. 14
Author(s):  
Elmo W. Wiikinkoski ◽  
Iiro Rautsola ◽  
Junhua Xu ◽  
Risto Koivula
Keyword(s):  
Zirconium Phosphate ◽  
Distribution Coefficients ◽  
Ion Exchanger ◽  
Molar Ratio ◽  
Experimental Conditions ◽  
Column Separation ◽  
Phosphate Ion ◽  
Trivalent Lanthanide ◽  
Separation Factors ◽  
Equimolar Solution

The trivalent lanthanide-actinide separations are a major challenge in reprocessing of nuclear fuels. To achieve this, commonly organic extractants and solvents are utilized in elaborate processes. Here we report a simple new method that can perform a supportive or alternative role. A nanocrystalline α-zirconium phosphate ion exchanger was utilized for Eu(III)/Am(III) column separation. Comprehensive preliminary studies were done using batch experiments to optimize the final separation conditions. The distribution coefficients for Eu were determined as a function of pH (from 0 to 3) and salinity (Na, Sr). The distribution coefficients for Am were determined as a function of pH, and Eu concentration, from 1:40 to 10,000:1 Eu:Am molar ratio. The exchanger always preferred Eu over Am in our experimental conditions. Separation factors (Eu:Am) of up to 400 were achieved in binary Eu-Am solution in pH 1. The breakthrough capacity was determined in dynamic column conditions using Eu: 0.3 meq∙g−1, which is approximately 4% of the theoretical maximum capacity. Two types of hot column separation tests were conducted: (i) binary load (selective Am elution), and (ii) continuous equimolar binary feed. In both cases separation was achieved. In (i), the majority (82% of the recovered 93%) of Am could be purified from Eu with extremely high 99.999% molar purity, while alternatively even more (95% of the recovered 93%) at a lower purity of 99.7 mol %. In (ii), up to 330 L∙kg−1 of the equimolar solution per mass of the exchanger could be treated with Am purity above 99.5 mol % in the total eluate. Alternatively, up to 630 L∙kg−1 above 95 mol %, or up to 800 L∙kg−1 above 90 mol % purities.

Studies on thorium phosphate ion exchanger

1974 ◽  
Vol 101 (1) ◽  
pp. 63-72 ◽  
Author(s):  
Anil K. De ◽  
Kailas Chowdhury
Keyword(s):  
Ion Exchanger ◽  
Phosphate Ion

Layered double hydroxide and zirconium phosphate as ion exchangers for the removal of ‘black crusts’ from the surface of ancient monuments

2018 ◽  
Vol 47 (9) ◽  
pp. 2976-2985 ◽  
Author(s):  
E. Boccalon ◽  
M. Nocchetti ◽  
M. Pica ◽  
A. Romani ◽  
M. Casciola
Keyword(s):  
Layered Double Hydroxide ◽  
Zirconium Phosphate ◽  
Ion Exchanger ◽  
Ion Exchangers ◽  
Black Crusts ◽  
Innovative Tool ◽  
Ancient Monuments ◽  
Double Hydroxide

Two ion exchanger solids (LDH and ZrP) as an innovative tool to remove gypsum from ancient monuments.

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