Battery Recovery

The advanced hydro-metallurgical process is used to recover aluminium, copper, lithium, iron, and other metal materials from discarded LiFePO4 batteries. This process can achieve a recovery efficiency of up to 80%. Here are the steps involved in the process:

Recovery Process and Steps of Cathode Materials

Aluminium foil, being an amphoteric metal, is dissolved in a NaOH alkali solution to form NaAlO2, which enters the solution. After filtration, the filtrate is neutralised with sulphuric acid and precipitated to obtain Al(OH)3. When the pH is above 9.0, most of the aluminium precipitates, and the obtained Al(OH)3 achieves chemical purity after analysis.

The filter residue is dissolved with sulphuric acid and hydrogen peroxide. This process allows lithium iron phosphate to enter the solution in the form of Fe2(SO4)3 and Li2SO4, separating it from carbon black and carbon coating on the lithium iron phosphate surface. After filtration and separation, the pH of the filtrate is adjusted with NaOH and ammonia water. Iron is first precipitated with Fe(OH)3, and then the remaining solution is precipitated with saturated Na2CO3 solution at 90ºC.

Since FePO4 is slightly soluble in nitric acid, the filter residue is dissolved with nitric acid and hydrogen peroxide. This process directly precipitates FePO4 and separates impurities like carbon black from the acid solution. It also leaches Fe(OH)3 from the filter residue and precipitates Li2CO3 with saturated Na2CO3 solution at 90ºC.

Recovery of Anode Materials

The recovery process for anode materials is relatively straightforward. Following the separation of the anode plates, the purity of copper can exceed 99%. This high-purity copper can then undergo further refining to produce electrolytic copper.

Recovery of Diaphragm

The diaphragm material is mainly harmless and has no recycling value.

List of Recycling Equipment

Automatic dismantling machine, pulverize, wet gold pool, etc.