Recycling method of waste lithium battery
The recycling process of waste lithium batteries mainly includes pretreatment, secondary treatment and advanced treatment. As there is still some electricity in the used batteries, 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 by 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!
Waste lithium battery recycling according to the extraction process, battery recycling methods are mainly divided into dry recovery, wet recovery and biological recovery of three technologies. 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 box and other battery components crushing, screening, magnetic separation, crushing, classification, to obtain valuable high-content material, for the subsequent chemical leaching process to prepare.
The recycling and treatment method of waste lithium batteries, because the current physical separation method in dry recovery is used to crush and sieve the battery components such as electrode active materials, current collectors, battery shells, etc., once the magnetic separation is carried out, the metal particles are not fully crushed and refined, and metals with different elements are easily involved in the metal particles. There are the following problems: subsequent chemical leaching is difficult to accurately recover metals, in the process of magnetic separation, it is easy to cause metal loss due to mechanical involvement, and it is difficult to completely separate and recover metals. Including cracking separation, crushing, sieving, rolling crushing, pre-magnetic separation separation, ball milling crushing, secondary magnetic separation and final classification.
The waste lithium battery recovery and treatment method is characterized by including decomposition and separation, crushing, screening, rolling and crushing, pre-magnetic separation separation, ball milling and crushing, secondary magnetic separation and separation, the specific steps are as follows:
Step 1) the decomposition separation, residual discharge of the lithium battery for electrode active material, collector and battery shell decomposition separation;
Step 2) Crushing and decomposing electrode active substances, current collectors and battery shells with a crusher;
Step 3) to classify the sieve crushing materials, the main components of the screened particles are metal oxides, metal parts, carbon materials and carbon-based compounds, and the main components of the screened flakes are diaphragms, organic substances and steel shells;
Step 4) How to start the integrated processing equipment, first of all, crushing, recycling the use of crushing crushing crushing particles and flakes of lithium batteries, waste lithium battery processing equipment, power battery recycling equipment.
Step 5) then carry out pre-magnetic separation separation, crush the crushed material on the conveyor to the pre-magnetic separation bin, use the pre-magnetic separator to crush the crushed material, sort the metal particles of different magnetic conductivity, and carry out pre-sorting collection;
Step 6) immediately carry out ball grinding, the initial separation and collection of metal particles on the conveyor in turn into the ball grinding crushing bin, the magnetic separator screening out of different types of metal particles with ball mill in turn, so that the metal particles more refined;
Step 7) to carry out secondary magnetic separation separation, the metal after ball grinding on the conveyor to the secondary magnetic separation library, with the ball mill to the ball mill after the smaller diameter of the particles for secondary magnetic separation, screening out different magnetic conductivity of metal particles;
Step 8) Classify the metal particles separated from the secondary magnetic separation, accurately obtain different types of metal particles, and prepare 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!