Recovery of valuable metals from spent Li-ion batteries
Typ
Program
Publicerad
2020
Författare
Krenz, Pawel
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Lithium-ion battery production is expected to rise and with it battery waste. Recycling of
lithium-ion batteries through hydrometallurgy presents an important role in handling hazardous
battery waste and recovery of metals. Two approaches were investigated to remove the impurity
copper from a leached acid battery solution from spent lithium-ion batteries through solvent
extraction or scrubbing. Solvent extraction with Acorga M5640, mixture of Acorga M5640 and
Cyanex 272 as well as LIX 84-I were tested at different concentrations and pH values. The best
results were achieved using Acorga M5640 20 v% (37% extraction of copper and co-extraction
of 11% cobalt, at a pH of 0.8). In alternative, solvent extraction of manganese followed by
scrubbing the impurities were tested. D2EHPA (0.5 M) was used as the extractant and the
optimal pH for the solvent extraction of manganese was determined between 2.3-2.5 and the
optimal O:A ratio 1:1 (Extraction Cu 22%, Co 14% Mn 75%). Scrubbing results using 4 g/L
( and ) and 6 g/L manganese ( ) showed the least coextraction
with 6 g/L manganese using , in two stages. Stripping product of 21 g/L
manganese and 0.4 g/L cobalt was obtained under the conditions (O:A 10:1, 0.5 M H2SO4 and
25 min contact time) in one stage.