Technetium Removal Processes for Soluble Defense High-Level Waste

1984 ◽  
Vol 44 ◽  
Author(s):  
Darrel D. Walker ◽  
Jane P. Bibler ◽  
Richard M. Wallace ◽  
Martha A. Ebra ◽  
John P. Ryan
Keyword(s):  
Nitric Acid ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
High Level Waste ◽  
Weak Base ◽  
Strong Base ◽  
Sintered Metal ◽  
Base Resin ◽  
Removal Processes ◽  
High Level

AbstractTwo methods for removing technetium from soluble defense high-level waste are described. In the first method, technetium is precipitated as tetraphenylphosphonium pertechnetate and separated from the decontaminated solution using sintered metal crossflow filters. In the second method, pertechnetate is removed from solution using a strong base anion exchange resin and then eluted from the resin with nitric acid. The nitric acid is recovered by sorption of the pertechnetate on a weak base ion exchange resin. The pertechnetate is eluted from the weak base resin with NaOH and recovered by precipitation as the sulfide or oxide.

scholarly journals Kinetic, isotherm and thermodynamic investigations of nitrite (NO2–) removal from water by anion exchange resins

2018 ◽  
Vol 20 (2) ◽  
pp. 368-372 ◽  
Keyword(s):  
Anion Exchange ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Weak Base ◽  
Strong Base ◽  
Anion Exchange Resins ◽  
Base Resin ◽  
Equilibrium Data ◽  
Exchange Resins

This study presents the evaluation of a strong base (Purolite A200) and weak base (Purolite PFA847) polymeric anion exchange resins for nitrite removal. The different parameters on the removal of NO2– were investigated in batch sorption mode. Common isotherm models; Langmuir and Freundlich, were used in order to present a description of the equilibrium data. Experimental results showed that the equilibrium data tend to follow Freundlich isotherm model for weak base resin and Langmuir model for strong base resin. The sorption of NO2– on anion exchange resins was found to follow the pseudo-second order kinetic model. The values of thermodynamic parameters proved that ion exchange reaction of NO2– onto such resins are endothermic (ΔH > 0).

Preparation of Nanometer MgO by Ion Exchange Resin Method

2009 ◽  
Vol 79-82 ◽  
pp. 509-512 ◽  
Author(s):  
Min Yang ◽  
Hai Jun Guo ◽  
Yan Sheng Li ◽  
Le Zhou
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Low Cost ◽  
Ion Exchange Resin ◽  
Raw Material ◽  
High Yield ◽  
Preparation Methods ◽  
Strong Base ◽  
Average Size ◽  
Resin Method

In this paper, nanometer MgO powder was prepared by using MgCl2•6H2O as the raw material, and environmental benign strong-base anion exchange resin as the induced-precipitation regent. The influence of the concentration of MgCl2 solution, drying method, calcination temperature and time on particle size and physico-chemical features of MgO was studied. The optimal technical conditions were obtained. The XRD and SEM results show that the nanometer MgO prepared under the optimal technical conditions has regular hexagonal lamellar structure, and is composed of nanocrystals with average size between 10 to 25 nm. The existence of dry N2 prevented the sintering of MgO during decomposition processing of Mg(OH)2. Compared with the other nanometer MgO preparation methods, ion exchange resin method has the advantages of low cost, low pollution, high yield and environmental benign; therefore, it appears to be a promising method for the industrial manufacturing of nanometer MgO.

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