The recycling process for spent lithium-ion batteries involves crushing and separating the batteries using physical or chemical methods to obtain powder containing valuable metals. This process mainly includes pretreatment, crushing, separation, and purification steps. The core of the powdering process lies in efficiently and environmentally separating the valuable metals from the batteries while avoiding secondary pollution.
1. Pretreatment
Pretreatment is the first step in the recycling of spent lithium-ion batteries and mainly includes discharging, dismantling, and classification. Spent lithium-ion batteries usually contain residual charge, and direct processing may pose safety hazards. Therefore, they need to be completely discharged through saltwater immersion or other discharge methods. The dismantling process involves separating the non-metallic parts of the battery, such as the casing, separator, and electrolyte, for subsequent processing. Classification involves distinguishing batteries based on their type (e.g., ternary lithium batteries, lithium iron phosphate batteries, etc.) to apply different recycling processes.
2. Crushing
Crushing is the process of breaking down the dismantled battery materials into small particles using mechanical force. Commonly used crushing equipment includes jaw crushers, hammer crushers, and shear crushers. The crushed material usually needs further refinement to meet the requirements of subsequent separation.
3. Separation
Separation is the process of separating the crushed materials according to their composition. Commonly used separation methods include magnetic separation, gravity separation, and flotation. For example, magnetic separation can separate ferromagnetic materials, gravity separation can separate different metals based on density differences, and flotation utilizes differences in surface chemical properties to separate materials.
4. Purification
Purification is the further processing of the separated metal powder to improve its purity and recovery rate. Commonly used purification methods include pyrometallurgy and hydrometallurgy. Pyrometallurgy separates metals through high-temperature smelting, while hydrometallurgy extracts metals through chemical methods such as acid leaching, extraction, and electrolysis.
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