Solvent Delamination of Printed Circuit Boards
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Solution Overview
Problem
Current methods for extracting valuable metals from printed circuit boards (PCBs) are inefficient, costly, and generate significant toxic waste, particularly due to the challenges of delaminating metals from polymers and the environmental concerns associated with pyrometallurgical and hydrometallurgical processes.
Innovation Solution
A solvent system comprising multiple swelling agents, such as n-methyl-2-pyrrolidone (NMP) and resorcinol, is used to delaminate PCBs, separating metals from fiberglass and epoxy without dissolving them, thereby reducing toxic waste and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pyrometallurgical or hydrometallurgical processes are used to extract metals from PCBs, then metal recovery is achieved, but significant toxic waste is generated and environmental damage occurs
Solution Approach 1:
The patent extracts only the valuable metal components from PCBs using a selective solvent system, separating them from the polymer and fiberglass matrix without dissolving the metals. This targeted extraction avoids the need for harsh pyrometallurgical or hydrometallurgical processes that generate toxic waste, achieving metal recovery while minimizing environmental harm
Solution Approach 2:
The patent introduces a solvent system comprising multiple swelling agents (such as NMP and resorcinol) as an intermediary substance. This solvent system selectively swells the polymer matrix to facilitate metal separation without requiring aggressive chemical treatments, serving as a benign mediator that enables metal recovery without generating significant toxic waste
2Quantity of substance
If conventional delamination methods are used to separate metals from PCBs, then metal extraction is achieved, but the process is inefficient and costly
Solution Approach 1:
The patent changes the chemical parameters of the delamination process by using a specifically formulated solvent system with multiple swelling agents at controlled temperatures and ratios. This optimization of chemical parameters enables efficient metal separation from the PCB matrix, significantly improving process productivity compared to conventional methods while reducing costs
3Manufacturing precision
If PCBs are shredded and soaked in solvent system, then metals are delaminated from polymers, but the process requires optimized solvent composition and temperature control
Solution Approach 1:
The patent employs a composite solvent system comprising multiple swelling agents (such as NMP and resorcinol) in specific ratios, creating a synergistic mixture that enhances metal delamination effectiveness. This composite approach allows for precise control of the delamination process while managing the complexity of solvent composition through systematic formulation
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
The solvent system effectively recovers valuable metals with less toxic waste generation, enhancing the efficiency and reducing environmental impact compared to conventional methods.
Implementation Method 1
A solvent system comprising multiple swelling agents, such as n-methyl-2-pyrrolidone (NMP) and resorcinol, is used to delaminate PCBs, separating metals from fiberglass and epoxy without dissolving them
Implementation Method 2
electrostatically separating different specific solids from the separated solids
Data Source
AI summary
A method of delamination of a printed circuit board includes comminuting the printed circuit board, and soaking the comminuted PCB in a solvent system comprising at least two solvents. Once soaking has been completed the method includes separating solids, and electrostatically separating different specific solids from the separated solids.