Radioactive Ion Exchange Resin Conditioning via Oxidative Dissolution
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Solution Overview
Problem
Current methods for conditioning radioactive ion exchange resins, such as embedding in a solid matrix or combustion, result in significant volume increase and high material costs, with existing volume reduction techniques like combustion being inefficient and generating excessive secondary waste.
Innovation Solution
The method involves mixing ion exchange resin with water and an oxidizing agent to break it down into water-soluble fragments, followed by solidification with a binder, achieving a volume reduction by converting the resin into dissolved fragments rather than a solid phase, using minimal equipment and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ion exchange resins are embedded in a solid matrix for storage, then the resins can be stored safely, but the volume increases by more than six times the resin volume
Solution Approach 1:
The patent changes the physical-chemical state of the resin from solid particles to dissolved fragments through oxidative treatment. This parameter change allows the resin to transition from a voluminous solid phase to a concentrated aqueous solution, which can then be solidified into a compact form factor of 2 to 4, resolving the volume increase problem while maintaining storage safety
Solution Approach 2:
The patent employs phase transitions in sequence: first, the resin undergoes oxidation to dissolve into water-soluble fragments (solid to dissolved state); then, the aqueous solution is solidified with a binder (liquid to solid). This two-stage phase transition process achieves compact storage form while ensuring safety
2Volume of stationary object
If combustion is used to reduce resin volume, then the volume is reduced, but complex filter systems are required to prevent radioactivity escape and the process generates excessive secondary waste
Solution Approach 1:
The patent replaces the mechanical/thermal combustion process with a chemical oxidation process using oxidizing agents. This substitution eliminates the need for complex filtration systems and high-temperature equipment, reducing device complexity while achieving volume reduction through dissolution and solidification
Solution Approach 2:
The patent uses relatively simple and inexpensive oxidizing agents (such as hydrogen peroxide or ozone) and common binders (such as cement) to achieve the transformation. These materials are far simpler and cheaper than the specialized equipment required for combustion, reducing both device complexity and secondary waste
3Loss of substance
If complete mineralization of exchange resins is performed, then only metal salts remain, but very large amounts of oxidizing agents and immense equipment are required
Solution Approach 1:
The patent applies partial oxidation rather than complete mineralization. The resin is oxidized only to the extent needed to produce water-soluble fragments, not fully to carbon dioxide and water. This partial action significantly reduces the quantity of oxidizing agent required while still achieving the goal of resin destruction and volume reduction
Solution Approach 2:
The patent extracts only the necessary degree of oxidation needed to dissolve the resin into water-soluble fragments, rather than proceeding to complete mineralization. This selective extraction of the oxidation process stops at the optimal point where resin destruction is achieved but excessive oxidizing agent consumption and equipment requirements are avoided
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process reduces the volume of conditioned resin by a factor of 2 to 4 compared to direct embedding, minimizing material usage and secondary waste generation, while allowing for efficient storage and handling of radioactive waste.
Implementation Method 1
the ion exchange resin is mixed with water and is at least partially broken down into water-soluble fragments with the aid of an oxidizing agent added to the water
Implementation Method 2
the resulting aqueous solution being solidified with a binder
Data Source
AI summary
The invention relates to a method for conditioning a contaminated ion exchange resin, by mixing the same with water and at least partly breaking up the same into water-soluble components by means of an oxidising agent added to the water, wherein the resulting aqueous solution is immobilised with a binder, optionally after concentration by evaporation of water.