Froth Flotation for Battery Recycling
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Solution Overview
Problem
Current recycling methods for electrochemical cells and batteries, particularly pyrometallurgical processes, are energy-intensive, environmentally detrimental due to carbon dioxide emissions, and inefficient in reusing carbon and lead compounds, leading to high costs and environmental concerns.
Innovation Solution
The implementation of froth flotation technology to separate lead and carbon compounds from spent batteries, allowing for their reuse in new battery manufacturing, thereby reducing energy consumption and environmental impact while avoiding thermochemical reduction steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pyrometallurgical processes are used for recycling batteries, then lead compounds can be reduced to metallic lead, but energy consumption is very high and carbon dioxide emissions increase
Solution Approach 1:
The patent replaces the thermal/chemical pyrometallurgical system with a mechanical froth flotation system. Instead of heating materials to >1000°C to reduce lead compounds, the invention uses mechanical agitation, air bubbles, and flotation reagents to separate lead compounds from battery materials at ambient or moderate temperatures, thereby eliminating the high energy consumption associated with pyrometallurgy while maintaining effective recycling
Solution Approach 2:
The patent changes the operating parameters from high-temperature pyrometallurgical conditions to ambient or moderate temperature froth flotation conditions. By changing the temperature parameter from >1000°C to near-ambient conditions and using chemical reagents to facilitate separation, the process achieves effective recycling without the prohibitive energy consumption of traditional methods
2Reliability
If pyrometallurgical processes are used for recycling batteries, then lead compounds can be processed, but carbon dioxide emissions and waste materials are generated
Solution Approach 1:
The patent replaces the thermal/chemical pyrometallurgical system with a mechanical froth flotation system. Instead of heating materials to >1000°C to reduce lead compounds, the invention uses mechanical agitation, air bubbles, and flotation reagents to separate lead compounds from battery materials at ambient or moderate temperatures, thereby eliminating the high energy consumption associated with pyrometallurgy and the associated CO2 emissions
Solution Approach 2:
The patent converts the previously harmful carbon content in batteries into a beneficial element. Rather than viewing carbon as a contaminant that requires energy-intensive removal or that generates CO2 emissions during pyrometallurgy, the invention allows carbon to remain in the recycled material or be separately recovered as a useful product, transforming a harmful factor into a benefit
3Ease of manufacture
If carbon is present in batteries during pyrometallurgical recycling, then the battery materials can be processed, but carbon leads to excess carbon dioxide emissions and difficulty in maintaining proper CO2/CO ratio
Solution Approach 1:
The patent extracts carbon from the battery materials through froth flotation separation. By using flotation reagents and air bubbles, carbon particles are selectively separated from the lead compounds and other battery materials. This extraction of carbon before recycling eliminates the source of CO2 emissions during subsequent processing while maintaining the ability to process lead compounds effectively
4Reliability
If conventional pyrometallurgical recycling processes are used, then lead can be recovered, but the process is costly due to high energy intensity
Solution Approach 1:
The patent replaces the thermal/chemical pyrometallurgical system with a mechanical froth flotation system. Instead of heating materials to >1000°C to reduce lead compounds, the invention uses mechanical agitation, air bubbles, and flotation reagents to separate lead compounds from battery materials at ambient or moderate temperatures, thereby eliminating the high energy consumption associated with pyrometallurgy and the associated high costs
Solution Approach 2:
The patent changes the operating parameters from high-temperature pyrometallurgical conditions to ambient or moderate temperature froth flotation conditions. By changing the temperature parameter from >1000°C to near-ambient conditions and using chemical reagents to facilitate separation, the process achieves effective material recovery without the prohibitive energy consumption and costs of traditional methods
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
Froth flotation significantly reduces production costs and environmental impact by enabling the reuse of recycled materials, improving the separation efficiency of lead and carbon compounds, and producing high-grade materials suitable for direct use in battery construction.
Implementation Method 1
performing at least one froth flotation operation to separate lead dioxide (PbO2) from the suspension
Implementation Method 2
separate certain compounds during recycling of batteries
Data Source
AI summary
Processes for separating and recycling battery and electrochemical cell materials are disclosed.