Fluidized Bed Reactor Cooling Layout for Fine Lithium Particle Recovery
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Solution Overview
Problem
Existing methods for recovering valuable metals from lithium secondary batteries, particularly through dry reactions, face challenges in managing the flow control of fine cathode active material particles, leading to inefficiencies and environmental pollution.
Innovation Solution
A fluidized bed reactor with an expansion chamber and cooling units is used to manage the flow and temperature of the reaction, reducing the velocity of particles to prevent loss and enhance recovery efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cathode active material particles are made finer to improve reaction efficiency, then the reaction yield is improved, but the flow control of particles becomes unmanageable
Solution Approach 1:
A fluidizing agent gas is introduced as an intermediary substance to mediate the flow control of fine particles. The gas flows through the particle bed, providing upward force that suspends and fluidizes the particles, enabling manageable flow control even for fine particles that would otherwise be difficult to handle. This resolves the contradiction by allowing fine particles to be processed efficiently while maintaining flow control through the gas medium.
Solution Approach 2:
The patent applies pneumatic principles by using a fluidizing agent gas to control particle flow. The gas flow rate, pressure, and distribution are adjusted to achieve optimal fluidization, enabling the system to handle fine particles effectively. This pneumatic approach allows fine particles to be fluidized and transported controllably, resolving the flow control issue while maintaining high reaction efficiency.
2Object-affected harmful factors
If a dry reaction method is used to avoid environmental pollution and improve selectivity, then environmental pollution is reduced, but flow control of fine particles becomes problematic
Solution Approach 1:
The fluidizing agent gas serves as an intermediary that enables dry reaction processing of fine particles without direct contact between particles and equipment walls. The gas carries particles through the reaction zone, preventing aggregation and maintaining flow control in a pollution-free dry process. This resolves the contradiction by enabling environmental-friendly dry processing while maintaining operational control.
Solution Approach 2:
The system uses an inert or controlled atmosphere (such as nitrogen or air) as the fluidizing agent, creating a clean environment that prevents unwanted chemical reactions and environmental pollution. This inert environment allows fine particles to be processed in a controlled manner without contamination, resolving the contradiction between environmental protection and flow control.
3Productivity
If the reaction temperature is increased to improve reaction rate, then the reaction rate is improved, but particle loss increases due to high velocity
Solution Approach 1:
The reaction process is segmented into distinct zones: a fluidization zone where particles are suspended and reacted, and a separation zone where particles are settled and collected. This segmentation allows the reaction to occur at high temperature in the fluidization zone while preventing particle loss in the separation zone through controlled settling. The spatial division resolves the contradiction between high reaction rate and particle retention.
Solution Approach 2:
The system dynamically adjusts the fluidizing agent flow rate to control particle velocity. During the reaction phase, higher gas flow maintains fluidization for rapid reaction. During the collection phase, gas flow is reduced to allow particles to settle. This dynamic control of particle velocity resolves the contradiction between maintaining high reaction rates and preventing particle loss.
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 reactor design minimizes particle loss and enhances the recovery yield of lithium precursors by controlling particle velocity and temperature, improving the efficiency and selectivity of the recovery process.
Implementation Method 1
a reaction gas is introduced from a lower portion of the fluidized bed reactor to form a fluidized bed including a preliminary precursor mixture within the reactor body
Implementation Method 2
The fluidized bed portion that has entered the upper portion of the fluidized bed reactor may be cooled to descend it into the reactor body
Data Source
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AI summary
A method for recovering active metals of a lithium secondary battery may supply a cathode active material mixture to a fluidized bed reactor including a reactor body. A reaction gas may be introduced from a lower portion of the fluidized bed reactor to form a fluidized bed including a preliminary precursor mixture within the reactor body. The fluidized bed portion that has entered the upper portion of the fluidized bed reactor may be cooled to descend it into the reactor body, and then a lithium precursor may be recovered from the preliminary precursor mixture. Accordingly, a terminal velocity of the preliminary precursor is reduced, such that even if the particle size of the preliminary precursor is fine, loss due to scattering may be prevented.