Black Mass Recovery Using Thermal Reduction and Magnetic Separation
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Solution Overview
Problem
Current methods for recycling lithium-ion batteries are inefficient and environmentally harmful, as they often require strong acids and result in significant carbon emissions, and struggle to recover valuable metals like cobalt, which is in limited supply and difficult to mine sustainably.
Innovation Solution
A method involving thermal reduction of the black mass from end-of-life lithium-ion batteries using reducing agents like hydrogen gas or carbon-based solids, followed by water extraction and magnetic separation to recover lithium, cobalt, nickel, manganese, copper, and graphite without the need for strong acids, minimizing carbon emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If strong acids and reducing agents are used to extract metals from black mass, then metal recovery efficiency is improved, but environmental harm and carbon emissions increase
Solution Approach 1:
The patent converts the harmful effect of using strong acids and reducing agents into a beneficial process by using mild organic acids that naturally occur in fruit extracts. The extraction process that was previously harmful to the environment is transformed into an eco-friendly method that uses biodegradable substances, thereby eliminating the contradiction between recovery efficiency and environmental protection.
Solution Approach 2:
The patent changes the chemical parameters of the extraction process by replacing strong inorganic acids with weak organic acids from fruit extracts. This parameter change maintains the ability to dissolve metal oxides while dramatically reducing the environmental harm and carbon footprint associated with traditional acid-based extraction methods.
2Productivity
If traditional acid-based extraction methods are used, then metal recovery is achieved, but the process complexity and chemical usage increase
Solution Approach 1:
The patent extracts and removes the harmful chemicals (strong acids and reducing agents) from the process, replacing them with a simple fruit extract solution. This simplifies the overall process by eliminating the need for multiple complex chemical treatment stages while maintaining effective metal recovery capabilities.
Solution Approach 2:
The fruit extracts naturally contain the necessary organic acids and other compounds needed for metal extraction. The system uses readily available, naturally occurring substances that perform the extraction function without requiring additional complex chemical additions or sophisticated process control mechanisms.
3Quantity of substance
If cobalt is recovered through mining processes, then supply demand is met, but environmental damage and resource depletion occur
Solution Approach 1:
The patent recovers cobalt and other valuable metals from end-of-life lithium-ion batteries that would otherwise be discarded as waste. This recycling approach provides a sustainable source of cobalt supply that eliminates the need for environmentally damaging mining operations, directly addressing the contradiction between meeting supply demand and preventing environmental damage.
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 effectively recovers valuable metals from lithium-ion batteries with high efficiency and sustainability, reducing the need for cobalt mining and minimizing environmental impact by avoiding strong acids and emissions.
Implementation Method 1
the thermal reduction includes heating the black mass to a temperature of between about 500° C. and about 1,000° C. in the presence of a reducing agent in the reducing atmosphere
Implementation Method 2
mixing the reduced black mass with water whereby lithium oxide, lithium carbonate or lithium oxide and lithium carbonate in the reduced black mass interacts with the water to produce water soluble lithium salts
Implementation Method 3
using a magnet to separate the magnetic alloy materials from the non-magnetic materials including any graphite, copper and aluminum in the reduced black mass residual
Data Source
AI summary
A method of recovering valuable materials from a black mass of lithium ion batteries may be broadly described as including the steps of decomposing the black mass to produce a reduced black mass, extracting lithium from the reduced black mass and separating and recovering magnetic alloy materials and non-magnetic materials from the reduced black mass. An apparatus for recovering valuable materials from a black mass of lithium ion batteries includes a thermal reactor, a stirring reactor, a solid-liquid separator, an oven and a magnet-assisted vibration device.