Spherical Fuel Particle Production via Aqueous Urea Complexation
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Solution Overview
Problem
Current methods for producing spherical fuel or breeder material particles in high-temperature reactors require the use of organic substances, leading to technical challenges such as complex rinsing processes, environmental concerns, and increased production costs due to the need for organic liquids and subsequent recycling.
Innovation Solution
A method involving the addition of urea or similar reagents to a nitrate solution at room temperature, followed by heating to 80-100°C for several hours to create a stable, concentrated solution of water-soluble complex cations, which are then solidified into microspheres in an ammonia atmosphere, eliminating the need for organic solvents in post-treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic liquids are used for rinsing and post-treatment of fuel particles, then the production process can be completed, but the complexity of the process increases and environmental concerns arise
Solution Approach 1:
The invention changes the fundamental parameter of the rinsing medium from organic liquid to water. By modifying this critical parameter, the process eliminates the need for complex organic solvent handling, recycling, and environmental compliance procedures, while still achieving effective rinsing and post-treatment of the fuel particles
Solution Approach 2:
The invention extracts and removes the organic liquid component from the post-treatment process entirely. By replacing organic rinsing agents with water, the method eliminates the associated complexity of organic solvent management, disposal, and environmental protection requirements
2Productivity
If organic substances are used in the production process, then fuel particles can be produced, but production costs increase due to recycling requirements
Solution Approach 1:
By changing the rinsing medium parameter from organic to aqueous, the invention eliminates the need for expensive organic solvent recycling operations. Water-based rinsing is inherently more economical as water is cheaper, more readily available, and does not require the same level of environmental compliance and recycling infrastructure
3Ease of manufacture
If organic liquids are used for rinsing, then fuel particles can be processed, but environmental restrictions are imposed
Solution Approach 1:
The invention converts the potentially harmful organic solvent requirement into a beneficial aqueous-based process. By using water instead of organic liquids for rinsing and post-treatment, the method eliminates environmental hazards associated with organic solvent emissions, disposal, and environmental compliance while maintaining effective processing capability
Data Source
AI summary
A method for the production of spherical combustible or fertile material particles from an oxide of the group of the heavy metals uranium, plutonium, or mixtures thereof. For this purpose, the process steps of producing a base solution of the nitrates of the heavy metal(s), adding at least one first reagent in order to adjust the viscosity of the solution, dropping the solution to form microspheres, at least superficially solidifying the microspheres in an atmosphere containing ammonia, collecting the microspheres in a solution containing ammonia, and subsequent washing, drying and thermal treatment are carried out, where at least one of urea, ammonium carbonate, ammonium hydrogen carbonate, ammonium cyanate, and biuret are added to the base solution before adding the first reagent. The solution thus prepared is heated to a temperature T where 80° C.≦T<Ts and where Ts=boiling temperature of the solution, and is maintained at the temperature over a time period t where 2 h≦t≦8 h.