LFP Battery Recycling Plant With Two-Stage Comminution and Pyrolysis
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Solution Overview
Problem
Existing recycling methods for lithium iron phosphate (LFP) batteries are inefficient in separating valuable metals like lithium, aluminum, and copper from metal foils, leading to suboptimal recovery yields and safety concerns due to potential explosions during the recycling process.
Innovation Solution
A recycling plant and process involving two stages of comminution, drying, and pyrolysis, with explosion-proof design and inert gas protection, allowing efficient separation of battery materials by particle size and temperature-controlled pyrolysis to recover valuable metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single comminution step is used to process used LFP batteries, then the process is simpler and faster, but the separation efficiency of metal foils from active battery material is insufficient
Solution Approach 1:
The comminution process is divided into two distinct stages: a first comminution step that breaks down whole batteries into smaller fragments, and a second comminution step that further processes the dried material to achieve fine particle separation. This segmentation allows each stage to be optimized for its specific function, with the first stage focusing on size reduction and the second stage on particle separation, thereby achieving high separation efficiency while maintaining manageable process complexity
Solution Approach 2:
Drying is performed as a preliminary action between the two comminution steps. This preliminary drying removes moisture from the comminuted material, making it suitable for the second comminution step and preventing safety issues. By preparing the material in advance through drying, the subsequent comminution and separation operations can proceed efficiently and safely
2Productivity
If comminution is performed on moist battery material, then the process is continuous, but explosion risks increase
Solution Approach 1:
Drying is implemented as a preliminary action before the second comminution step and before pyrolysis. By removing moisture from the comminuted material in advance, the process eliminates explosion risks associated with processing wet material while maintaining overall process continuity through proper sequencing of operations
Solution Approach 2:
The moisture present in the battery material, which initially poses an explosion hazard, is converted into a benefit through the drying process. The drying step not only removes the harmful moisture but also prepares the material for more efficient comminution and pyrolysis, transforming a safety risk into a process advantage
3Productivity
If high-temperature pyrolysis is applied directly to whole batteries, then valuable materials can be recovered, but safety risks and energy consumption increase
Solution Approach 1:
The battery recycling process is segmented into multiple preparation stages (first comminution, drying, second comminution) before pyrolysis. This segmentation reduces battery size and removes moisture in advance, allowing pyrolysis to be performed safely on pre-processed material rather than whole batteries, thereby improving both safety and energy efficiency
Solution Approach 2:
Comminution and drying are performed as preliminary actions before pyrolysis. These preliminary steps break down the battery structure and remove moisture, creating optimal conditions for the subsequent pyrolysis process. This preparation ensures that pyrolysis can proceed at the required temperature with minimal safety risks and energy waste
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 process achieves a high yield of at least 95% separation of metal foils from active battery material, ensuring safety through explosion-proof design and enabling cost-effective, automated recycling of LFP batteries.
Implementation Method 1
a drying device, arranged downstream of the first comminuting device, to dry the comminuted battery material
Implementation Method 2
a drying device... to dry the comminuted battery material
Implementation Method 3
a pyrolysis device to pyrolyse the comminuted and dried battery material
Data Source
AI summary
Disclosed herein are a process and a plant for recycling used LFP batteries, the plant comprising including:a first comminuting device to comminute used LFP batteries to a first degree of comminution;a drying device, arranged downstream of the first comminuting device, to dry the comminuted battery material;a second comminuting device arranged downstream of the drying device, to comminute the dried battery material to a second degree of comminution, the second degree of comminution being greater than the first degree of comminution; anda pyrolysis device, arranged downstream of the second comminuting device, to pyrolyse the dried and comminuted battery material,where at least the second comminuting device is designed to be explosion-proof.