Electrokinetic Uranium Extraction with Cathode Enrichment Control
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Solution Overview
Problem
Existing electrokinetic uranium leaching technologies face challenges in achieving directional and controllable collection of uranium particles with the same charge property, leading to complex purification processes and high impurity rates due to varying charge properties and the generation of insoluble matters that block leaching channels.
Innovation Solution
A one-step method utilizing a mixture of FeCl3 and a chlorine-containing inorganic acid to convert uranium into positively charged ions, combined with an electric field to drive electromigration and electroosmosis, allowing selective reduction and fixation of uranium on a conductive plastic cathode electrode while preventing impurity precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional acid leaching methods using H2SO4 are employed, then uranium extraction can be achieved, but insoluble precipitates block leaching channels and reduce extraction efficiency
Solution Approach 1:
The patent changes the chemical parameters of the leaching system by using FeCl3 instead of traditional H2SO4, adjusting the oxidation state and charge properties of uranium to prevent precipitate formation and maintain channel permeability during leaching
Solution Approach 2:
The patent replaces traditional chemical leaching mechanisms with an electrokinetic system that uses electric fields to drive uranium migration and deposition, eliminating the need for aggressive acid leaching that causes precipitate blockage
2Productivity
If electrokinetic leaching is used to promote uranium migration, then extraction efficiency improves, but particles with varying charges migrate in different directions preventing controlled collection
Solution Approach 1:
The patent changes the charge parameter of uranium particles by using FeCl3 activation, which converts uranium into uniformly positively charged ions that can be directionally controlled by the electric field during electrokinetic migration
Solution Approach 2:
The patent introduces FeCl3 as an intermediary substance that mediates the charge state of uranium, ensuring uniform positive charging that enables controlled directional migration toward the cathode under the electric field
3Productivity
If multiple leaching agents are used to dissolve uranium, then extraction completeness improves, but the purification process becomes complex and impurity removal difficult
Solution Approach 1:
The patent merges the leaching and purification steps into a single electrokinetic process, where uranium is selectively activated, migrated, and deposited on the cathode in one integrated operation, eliminating complex multi-step purification procedures
Solution Approach 2:
The electrokinetic system performs self-purification by selectively migrating and depositing uranium on the cathode based on its charge properties, automatically separating it from impurities without requiring additional purification agents or complex processing steps
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
Enables efficient and selective uranium extraction and separation with reduced leaching agent use, achieving high-purity uranium enrichment on the cathode electrode with low impurity rates by controlling the activation environment and electric field strength.
Implementation Method 1
converting uranium elements in the sandstone-type uranium deposit into positively charged uranyl and its complexes
Implementation Method 2
converting uranium elements in the sandstone-type uranium deposit into positively charged uranyl and its complexes
Implementation Method 3
under the action of direct current, the anode iron gradually dissolves and converts into trivalent iron ions, providing an oxidant for the leaching system
Implementation Method 4
electroosmosis
Implementation Method 5
efficiently and selectively reduce oxidized high-valent uranium cations, which are ultimately reduced and fixed on the surface of a cathode conductive plastic electrode
Data Source
AI summary
A one-step method for electrokinetic uranium extraction and separation from sandstone-type uranium deposit is provided, including: using an activating leaching agent to adjust pH of activation environment as pH≤3, converting uranium elements in sandstone-type uranium deposit into positively charged uranyl and its complexes; applying direct current (DC) electric field with voltage gradient of 0.1 V/cm to 2 V/cm between cathode and anode, and allowing the uranium elements to move toward a cathode chamber under the action of the electric field and to undergo selective reduction by receiving electrons to produce a low-valent insoluble uranium-containing substance precipitated on the cathode surface. The present invention, through activating leaching, allows the formation of positively charged uranium ions and their complexes only, and electrophysical effects such as electromigration and electroosmosis promote directional movement of uranium toward cathode, thereby achieving uranium extraction from a sandstone-type uranium deposit.