Centrifugal Extractor Waste Lithium Iron Phosphate Battery Recycling Process Flow

Centrifugal extraction is a highly efficient liquid separation technology that utilizes centrifugal force to separate mixed liquids into different components. It is widely applied in various industries, including waste lithium iron phosphate battery recycling, petroleum, food, and pharmaceuticals. Centrifugal extractors can efficiently extract metal ions, achieving high-purity purification. Additionally, they offer environmental and economic benefits, reducing the generation and discharge of wastewater, waste gas, and solid waste.

In the recycling process of used lithium iron phosphate batteries, the centrifugal extractor is mainly applied in the extraction and decontamination step, in order to improve the purity of valuable metals (e.g. lithium) in the recycling process. The following is the recycling process of a used lithium iron phosphate battery combined with a centrifugal extractor:

Dismantling: dismantle the waste lithium iron phosphate batteries and separate out the battery shell, positive and negative electrode pieces, diaphragm and other parts.

Crushing and screening: Crush the positive and negative electrode pieces, and separate the materials with different particle sizes through screening for subsequent processing.

Leaching: An appropriate leaching process (e.g. two-stage countercurrent leaching) is used to leach the crushed material to obtain a leach solution containing phosphate ions, ferrous ions and lithium ions.

Extractant selection: According to the components in the leaching solution, select the appropriate extractant (e.g. a mixture of bis(2-ethylhexyl) phosphate and sulfonated kerosene) for extraction.
Centrifugal extraction: The centrifugal extractor is utilized to carry out the extraction operation on the leach solution. The centrifugal extractor creates a strong centrifugal force field at a high rotational speed, which makes the extractant and the target elements (e.g., lithium) in the leach solution come into full contact with each other and undergo an extraction reaction. At the same time, the centrifugal force helps to separate the two phases quickly after extraction.
Multi-stage extraction and back-extraction: The extraction efficiency and purity of lithium is improved through a multi-stage continuous counter-current extraction process. Subsequently, the lithium element in the organic phase loaded with lithium is back-extracted using the back-extraction process to obtain a lithium-rich solution.

Precipitation or crystallization: The lithium-rich solution is further processed (e.g. adding soluble carbonate to precipitate lithium ions) to obtain high-purity lithium carbonate or other lithium products.
Drying and packaging: The prepared lithium carbonate is dried and processed, and packaged and stored according to the specified standards.

Tail gas treatment: The waste gas (such as volatile electrolyte, pyrolysis waste gas, etc.) generated during the whole recycling process needs to be treated by purification processes such as secondary combustion, rapid cooling, water washing, alkali washing, etc., to ensure that it meets the standards for discharge.
Environmental protection measures: In the whole recycling process, it is necessary to strictly comply with environmental protection regulations and standards, and take effective measures to reduce the generation and discharge of wastewater, waste gas, and solid waste.

Advantages of centrifugal extractor in the recycling process

High efficiency: centrifugal extractor is characterized by large processing capacity and high extraction efficiency, which can significantly improve the recovery rate of valuable metals in waste lithium iron phosphate batteries.
Environmental protection: through precise extraction and back-extraction operations, the centrifugal extractor helps to reduce the generation and discharge of wastewater, slag, and other pollutants.
Economy: centrifugal extractor equipment is simple, has a small investment, is easy to maintain, and can reduce the cost of waste lithium iron phosphate battery recycling treatment.

To summarize, centrifugal extractor plays an important role in the recycling process of waste lithium iron phosphate battery, and improves the effect of recycling treatment and economic benefits through its high efficiency, environmental protection and economic advantages.