Silver Recovery from Photovoltaic Particles Using Deep Eutectic Solvents
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Solution Overview
Problem
Current silver recovery processes from photovoltaic panels are complex, expensive, and environmentally hazardous, failing to achieve satisfactory dissolution and recovery due to the use of toxic and non-biodegradable ionic liquids.
Innovation Solution
A method involving deep eutectic solvents and a redox mediator is used to dissolve and recover silver, where particles from photovoltaic cells are immersed in a solution, followed by electrolysis to regenerate the mediator and deposit silver, eliminating the need for toxic substances and reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional chemical dissolution methods using concentrated acids are used to recover silver, then silver dissolution efficiency is improved, but environmental harm and safety risks increase significantly
Solution Approach 1:
The invention changes the chemical parameters of the dissolution medium by replacing concentrated acids with ionic liquids, fundamentally altering the dissolution mechanism from aggressive chemical attack to controlled complexation, thereby maintaining efficiency while eliminating environmental harm
Solution Approach 2:
The invention introduces ionic liquids as intermediary substances that mediate between the silver particles and the recovery process, enabling dissolution through complexation with anions while avoiding direct contact with harmful acids, thus resolving the contradiction between efficiency and environmental safety
2Object-affected harmful factors
If ionic liquids are used to dissolve and recover silver, then environmental safety is improved, but process complexity and cost increase
Solution Approach 1:
The invention extracts and isolates the silver dissolution function from the complex mixture of acids and additives, using pure ionic liquids as the sole dissolving medium, thereby simplifying the overall process while maintaining environmental safety
Solution Approach 2:
The ionic liquids serve multiple functions simultaneously: they act as the dissolving medium, the complexing agent, and the electrolyte for subsequent electrochemical recovery, eliminating the need for separate reagents and process steps, thus reducing complexity while maintaining safety
3Quantity of substance
If conventional reprocessing methods are used to recover metals from photovoltaic panels, then metal recovery is achieved, but economic cost and environmental impact increase significantly
Solution Approach 1:
The ionic liquids enable the system to be self-sufficient by serving as both the dissolving medium and the electrolyte for electrochemical recovery, eliminating the need for external chemical reagents and reducing both economic cost and environmental impact while achieving complete metal recovery
Solution Approach 2:
The invention recovers not only the silver but also the ionic liquid medium itself through electrochemical regeneration, allowing the solvent to be reused indefinitely, thereby eliminating continuous consumption of chemical reagents and significantly reducing both economic and environmental costs
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 enables efficient, cost-effective, and environmentally friendly silver recovery, regenerating the redox mediator and avoiding chemical degradation, with the use of biodegradable deep eutectic solvents that are inexpensive and easy to prepare, allowing for complete and pure silver recovery under atmospheric conditions.
Implementation Method 1
immersing particles containing silver in a solution comprising a deep eutectic solvent and a redox mediator, thereby forming silver ions in solution
Implementation Method 2
performing electrolysis of the solution, thereby reducing the silver ions and regenerating the redox mediator
Implementation Method 3
the silver is recovered by electrolysis in metallic form
Implementation Method 4
a solution comprising a deep eutectic solvent and a redox mediator, thereby forming silver ions in solution
Data Source
Figure 1
AI summary
A process for recovering silver contained in particles, for example from a photovoltaic cell grind, the process comprising the following successive steps: i) immersing silver-containing particles in a solution comprising a deep eutectic solvent and a redox mediator, thereby forming silver ions in solution, ii) separating the particles from the solution containing the silver ions, iii) carrying out electrolysis of the solution, thereby reducing the silver ions and regenerating the redox mediator.