Recovery of valuable elements from spent Li-batteries.
This work examines two recycling processes for spent Li/MnO(2) and Li-ion batteries. The anode, cathode and electrolyte (LiPF(6)) were submitted to one of the following procedures: (a) calcination at 500 degrees C (5h) followed by solvent extraction to recover lithium salts (fluoride, phosphate) in good yield (90 wt%). The residual solid was treated with H(2)SO(4) containing H(2)O(2) and on evaporation gave high purity grade cobalt or manganese sulfate; (b) fusion with KHSO(4) (500 degrees C, 5h). The resulting aqueous solution was added dropwise to a solution of NaOH, giving cobalt or manganese as impure precipitate. Addition of KF precipitated high purity grade LiF in moderate yield (50 wt%). The final aqueous solution on treatment with calcium sulfate precipitated the corresponding phosphate and fluoride salts.
Departamento de Química Analítica, Instituto de Química, Universidade Federal do Rio de Janeiro, P.O. Box 68563, 21949-900 Rio de Janeiro, Brazil.
Jéssica Frontino
JF
Paulino
Natália Giovanini
NG
Busnardo
Julio Carlos
JC
Afonso
D003035:Cobalt / Q000737:chemistry / Q000302:isolation & purification*; D003247:Conservation of Natural Resources / Q000379:methods*; D011211:Electric Power Supplies; D005459:Fluorides / Q000737:chemistry; D006358:Hot Temperature; D006861:Hydrogen Peroxide / Q000737:chemistry; D008094:Lithium / Q000737:chemistry / Q000302:isolation & purification*; D008345:Manganese / Q000737:chemistry / Q000302:isolation & purification*; D017895:Manganese Compounds; D010087:Oxides; D017680:Potassium Compounds / Q000737:chemistry; D012972:Sodium Hydroxide / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry; D013464:Sulfuric Acids / Q000737:chemistry; D014866:Waste Products
D017895:Manganese Compounds; D010087:Oxides; D017680:Potassium Compounds; D013431:Sulfates; D013464:Sulfuric Acids; D014866:Waste Products; D003035:Cobalt; D008345:Manganese; D012972:Sodium Hydroxide; C027424:manganese oxide; C033320:potassium fluoride; D008094:Lithium; D006861:Hydrogen Peroxide; C033158:sulfuric acid; D005459:Fluorides