Recycling method of waste lithium battery
The recycling process of waste lithium batteries mainly includes pretreatment, secondary treatment and advanced treatment. As the waste battery still has some electricity, the pretreatment process includes deep discharge process, crushing and physical separation. The purpose of the secondary treatment is to realize the complete separation of the positive and negative active materials and the foundation, and to realize the complete separation of the two through regular heat treatment method, organic solvent dissolution method, alkali solution dissolution method and electrolysis method. Deep treatment mainly includes two processes of leaching and separation and purification to extract valuable metal materials, then, below together to understand the waste lithium battery recycling treatment method!
According to the classification of extraction process, the battery recovery method is mainly divided into dry recovery, wet recovery and biological recovery three categories of technology. Dry recovery refers to the direct recovery of materials and valuable metals without passing through media such as solutions. Among them, the main methods used in dry recovery are physical separation and high temperature pyrolysis.
Physical separation method refers to the decomposition and separation of the battery, the electrode active material, current collector, battery shell and other battery components crushing, screening, magnetic separation, crushing, classification, to obtain valuable high-content material, for the future chemical leaching process to prepare.
Waste lithium battery recycling treatment method, the current dry recovery of physical separation method in the use of the electrode active material, current collector, battery shell and other battery components are crushed, sieved, once magnetic separation after crushing, separation, so the metal particles are not fully crushed, micronization, metal particles easily involved in a variety of different elements of the metal is difficult to accurately recover metal through chemical leaching, and in the process of magnetic separation, loss of metal due to mechanical entanglement is likely to occur, and it is difficult to completely separate and recover the metal. Including decomposition, crushing, sieving, rolling and crushing, pre-magnetic separation, ball mill crushing, secondary magnetic separation and classification.
The recycling and treatment methods of waste lithium batteries are characterized by decomposition and separation, crushing, screening, rolling and crushing, pre-magnetic separation, ball mill crushing, secondary magnetic separation and separation. The specific procedures are as follows
Step 1) decomposition and separation, the residual discharge of the lithium battery for electrode active material, current collector and battery shell decomposition and separation;
Step 2) Crushing and decomposing electrode active substances, current collectors and battery shells with a crusher;
Step 3) through the sieve, the use of the sieve to classify the broken material, the main components of the screened granular material are metal oxides, metal parts, carbon materials and carbon compounds, the main components of the screened sheet are diaphragm, organic matter and steel shell;
Step 4) Start the integrated processing equipment, first carry out crushing, use the crushing crusher to crush the particle-like material and flakes.
Step 5) then carry out pre-magnetic separation separation, the crushed material on the conveyor belt to the pre-magnetic separation warehouse, the use of pre-magnetic separation machine to crush the crushed material, magnetic separation of different magnetic conductivity of metal particles, pre-sorting collection;
Step 6) immediately carry out the ball mill crushing, the pre-classified collection of metal particle-like material on the conveyor belt in turn into the ball mill crushing warehouse, with the ball mill will be sorted different types of metal particles in turn ball grinding, so that the metal particle-like material is more refined;
Step 7) to carry out secondary magnetic separation, the ball mill crushed metal on the conveyor belt to the secondary magnetic separation library, with the ball mill to the ball mill after the smaller diameter of the particles with secondary magnetic separation, more fine separation of metal particles with different magnetic conductivity;
Step 8) Classify the metal particles separated by the secondary magnetic separation to accurately obtain different types of metal particles, which is prepared for the subsequent chemical leaching process.
The above is the waste lithium battery recycling method, if you need to know more, you can contact us at any time!