Hydrometallurgical process for rare earth elements recovery from spent Ni-HM batteries

Alonso, Alejandro R.; Pérez, Emilio Ortega; Lapidus, G.T.; Luna-Sánchez, Rosa María

doi:10.1179/1879139515y.0000000013

Cited by 11 publications

(2 citation statements)

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“…The optimum experimental conditions found for formic acid in the present study are comparable to those normally reported for inorganic acids (Turek, 2018) and for leaching of Li-ion batteries in the presence of organic acids (Fu et al, 2019), except the S/L ratio. In general, literature reports a S/L ratio in the range 2-50 g L -1 (Alonso et al, 2017;Colmenares et al, 2018;Fu et al, 2019;Fernandes et al, 2013;Santos et al, 2014;Korkmaz et al, 2018;Oliveira et al, 2017), but the concentration of the organic acid is much lower (< 5 mol L -1 ) than in the present study.…”

Section: Effect Of Acid Concentrationcontrasting

confidence: 48%

“…They are biodegradable, delay corrosion of equipments, are safer to handle and emit less toxic gases than strong acids (Gao et al, 2018;Meshram et al, 2020). Studies involving organic acids (citric, oxalic, acetic) only focused the leaching step (Alonso et al, 2017;Colmenares et al, 2018). Separation and purification steps are required for recovery of metal ions from their leachates.…”

Section: Introductionmentioning

confidence: 99%

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RECOVERY OF METALS FROM ELECTROACTIVE COMPONENTS OF SPENT Ni-MH BATTERIES AFTER LEACHING WITH FORMIC ACID

2021

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this work describes a route for recovering nickel, cobalt, iron, zinc and lanthanides from spent nickel-metal hydride batteries. Formic acid was used as leachant. Experiments were run at 25-50°C for 1-4 h. Under the best conditions leaching yields surpassed 99 wt.%, except for iron. The insoluble matter contains almost solely iron as iron(III) basic formate. The leachate went through six separation procedures, combining solvent extraction with D2EHPA as extractant, and precipitation reactions. Fe2+ and Zn2+ were extracted together (> 99 wt.%) from the original leachate (pH ~1.5). Yttrium and lanthanides were precipitated as oxalates directly from the raffinate (> 99.9 wt.%) upon addition of sodium oxalate. In the next steps, Mn2+ and Co2+ were extracted with D2EHPA at buffered pH (3 and ~4.8, respectively), after adding NaOHaq. About 10 wt.% of leached Ni2+ was coextracted with Co2+. The remaining Ni2+ was precipitated from the raffinate after addition of aqueous sodium oxalate at pH 6. After precipitation of Al3+ upon addition of NaOHaq. until pH ~8, sodium formate was recovered after slow evaporation of the final aqueous solution at 60oC. It contains ~90 wt.% of the formate present in the leachant.

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