Powder removal treatment of waste lithium battery electrode foil

The material is evenly fed into grinding area by feeding system, and is strongly impacted by high-speed rotating grinding hammer, at the same time, it is affected by centrifugal force, collides with the grinding gear ring, and is affected by multiple comprehensive forces such as shearing, friction and collision, so that electrode foils are ground, black particle is peeled off from the aluminum foil/copper foil. Ground material moves to classification area with air flow, black particles are separated from electrode foils by frequency-controlled classification wheel. The black particle is collected by the cyclone and bag filter with air flow, electrode foils are discharged through slag discharge port at bottom of grinding area.

Electrode foil enter grinding chamber and subjected to strong shearing, collision and friction between high-speed rotating turbine rotor and stator, causing black particle to be quickly peeled off electrode foils. Ground electrode foil is sorted to separate the black particle from the aluminum foil/copper foil.

Under the action of the fan, the material moves to the classification area at a high speed from the lower inlet of the classifier with the updraft. Under the action of the strong centrifugal force generated by the high-speed rotating classification turbine, the material is separated, and the fine particles meeting the particle size requirements enter the cyclone separator or dust collector through the blade gap of the classification wheel for collection. The velocity of some fine particles entrained by coarse particles disappears after hitting the wall, and then decreases to the secondary air outlet along the wall of the cylinder. Through the strong washing effect of the secondary air, the coarse and fine particles are separated, the fine particles rise to the secondary classification in the classification area, and the coarse particles drop to the discharge port for discharge.

1. Adopting physical principle of COANDA;
2. Fine particles move along the wall with airflow due to COANDA effect, large particles are thrown out due to inertia and centrifugal force, thus achieving the purpose of particle classification;
3. Simple structure, no rotating parts, low operating cost;
4. Products with three particle sizes of coarse, medium and fine can be classified at the same time;
5. It is especially suitable for classifying products with narrow particle size distribution and non-destructive particle morphology;
6. It has more advantages than rotor classification for classifying materials with poor fluidity and irregular particles.