Deye Spring RW-M6.1 - Battery Recovery; Recovery Processes and Equipment; Transportation Requirements

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8 Battery recovery
Aluminum, copper, lithium, iron, and other metal materials are recovered from discarded
LiFePO4 batteries by advanced hydrometallurgical process, and the comprehensive recovery
efficiency can reach 80%. The specific process steps are as follows:
8.1 Recovery process and steps of cathode materials
Aluminum foil as collector is amphoteric metal. Firstly, it is dissolved in NaOH alkali solution
to make aluminum enter the solution in the form of NaAlO
2
. After filtration, the filtrate is
neutralized with sulfuric acid solution and precipitated to obtain Al (OH)
3
. When the pH val-
ue is above 9.0, most of the aluminum precipitates, and the obtained Al (OH)
3
can reach the
level of chemical purity after analysis.
The filter residue is dissolved with sulfuric acid and hydrogen peroxide, so that lithium iron
phosphate enters the solution in the form of Fe
2
(SO
4
)
3
and Li
2
SO
4
, and is separated from
carbon black and carbon coated on the surface of lithium iron phosphate. After filtration
and separation, the pH value of the filtrate is adjusted with NaOH and ammonia water. First,
iron is precipitated with Fe (OH)
3
, and the remaining solution is precipitated with saturated
Na
2
CO
3
solution at 90 ℃.
Since FePO
4
is slightly dissolved in nitric acid, the filter residue is dissolved with nitric acid
and hydrogen peroxide, which directly precipitates FePO
4
, separates impurities such as car-
bon black from acid solution, leaches Fe (OH)
3
from filter residue respectively, and precipi-
tates Li
2
CO
3
with saturated Na
2
CO
3
solution at 90 ℃.
8.2 Recovery of anode materials
The recovery process of anode materials is relatively simple. After the separation of anode
plates, the purity of copper can be more than 99%, which can be used for further refining
electrolytic copper.
8.3 Recovery of diaphragm
The diaphragm material is mainly harmless, and has no recycling value.
8.4 List of recycling equipment
Automatic dismantling machine, pulverizes, wet gold pool, etc.
9 Transportation Requirements
The battery products should be transported after packaging and during the transportation
process, severe vibration, impact, or extrusion should be prevented to prevent sun and rain.
It can be transported using vehicles such as cars, trains, and ships.