Plasma Extraction of Metallic Species from Electronic Waste
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Solution Overview
Problem
Current recycling technologies, such as hydrometallurgy and pyrometallurgy, face challenges in efficiently extracting metals from electronic waste due to variable composition, high energy consumption, and inconsistent purity, making them unsuitable for processing complex alloys found in electronic waste.
Innovation Solution
A process involving plasma injection into an extraction chamber, where the plasma forms and excites molecules at the surface of the matrix, allowing for continuous monitoring and selective extraction of desired metallic species through real-time adjustment of plasma parameters, ensuring high purity and adaptability to varying compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hydrometallurgy is used to extract metals from electronic waste, then metallic species can be extracted from the matrix, but the process is not adaptable to variable composition and requires complex chemical operations
Solution Approach 1:
The invention changes physical parameters (plasma power, gas flow rates, temperature, pressure) rather than relying on complex chemical solutions. By adjusting these parameters, the same plasma-based system can adapt to different matrix compositions and extract various metallic species efficiently, resolving the adaptability issue of hydrometallurgy
Solution Approach 2:
The invention replaces the complex chemical system of hydrometallurgy (multiple chemical reagents, solutionization steps, purification chemicals) with a plasma-based physical-chemical process. The plasma provides both thermal energy for evaporation and reactive species for selective extraction, simplifying the overall process while maintaining extraction effectiveness
2Adaptability or versatility
If pyrometallurgy is used to extract metals from electronic waste, then the process can be adapted to variable composition, but energy consumption is high and purity consistency is not guaranteed
Solution Approach 1:
Instead of applying extreme high-temperature pyrometallurgical processing to all materials, the plasma process applies targeted energy only where needed for selective extraction. The plasma can be tuned to provide just enough energy to vaporize and extract specific metallic species at controlled rates, reducing overall energy consumption while maintaining adaptability
Solution Approach 2:
The invention incorporates real-time monitoring of extraction conditions and adjusts plasma parameters dynamically to maintain consistent purity levels. This feedback control ensures that even with variable matrix composition, the extraction process maintains stable performance and product quality, addressing the purity consistency issue
3Manufacturing precision
If plasma extraction is used to selectively extract metallic species, then high purity and adaptability are achieved, but real-time monitoring and parameter adjustment are required
Solution Approach 1:
The system uses real-time monitoring of plasma characteristics (emission spectra, power consumption, gas flow) to automatically adjust extraction parameters. This closed-loop feedback control achieves high extraction purity by continuously optimizing conditions while managing system complexity through automation rather than manual intervention
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 method enables the efficient and selective extraction of metallic species, including rare earths, from matrices of any composition, achieving high purity and allowing for sequential recovery of multiple species without redesigning the system, thus addressing the limitations of existing technologies.
Implementation Method 1
injecting a plasma in an extraction chamber by means of a plasma torch
Implementation Method 2
formation of molecules, at the surface of the matrix, from chemical elements contained in the matrix and in the plasma
Implementation Method 3
evaporation of said molecules from the matrix
Implementation Method 4
The plasma is caused to act on the matrix for a predetermined period of time
Implementation Method 5
destruction of some molecules and excitation of chemical elements contained in the molecules and extracted from the matrix
Implementation Method 6
continuously monitoring the excited elements extracted from the matrix and contained in the plasma by optical emission spectroscopy
Implementation Method 7
collection of said molecules comprising said desired species by deposition onto the surface of the plate
Data Source
AI summary
The invention relates to a process for selectively and continuously extracting a series of desired species from a matrix, comprising the steps of:—injecting a plasma (310) in an extraction chamber by means of a plasma torch,—continuously monitoring (320) the excited elements extracted from the matrix and contained in the plasma by optical emission spectroscopy, and for each species of the series,—setting a distance (330) between the support and the plasma torch, and the composition of the injected plasma as a function of the monitored excited elements so that only one desired species of the series of species is being extracted from the matrix under molecular form, and—providing (400) a plate in the extraction chamber, exterior to the plasma, causing collection of molecules comprising said desired species by deposition onto the surface of the plate.