Process intensification for valuable metals leaching from spent NiMH batteries

JenniLie, JenniLie, ChiehLin, Yu- and ChernLiu, Jhy- (2021) Process intensification for valuable metals leaching from spent NiMH batteries. Process intensification for valuable metals leaching from spent NiMH batteries, 167. pp. 1-10. ISSN 02552701, Jurnal Internasional Bereputasi SJR(2021): 0.77, Q1, H-Index: 111

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Abstract

Acid leaching is an essential unit in hydrometallurgy, yet it is time consuming and requires concentrated acids. Process intensification is examined for the leaching of valuable and rare earth elements (REEs), such as Ni, Co, La, Nd, and Ce, from spent nickel metal hydride (NiMH) batteries using subcritical water extraction (SWE) and microwave-assisted extraction (MAE). Results of SWE revealed that HCl performed better than H2SO4 and HNO3. Leaching efficiency increased as reaction temperature increased from 100 to 150◦C, and it increased with HCl concentration. SWE was very effective using 0.5 N HCl, solid concentration of 20 g/L, initial pressure of 9.8 bar, 100◦C for 5 min, and leaching efficiency of 99.85% for Ni, 91.72% for Co, 96.26% for La, 85.75% for Nd, and 84.37% for Ce was found, and the total energy consumption was 2,640 kJ. Leaching efficiency of MAE using 0.5 N HCl decreased slightly when heating rate increased from 30 to 70◦C/min, and it increased as reaction time increased from 5 to 30 min. Compared with SWE and conventional leaching, MAE was the most energy-efficient, and total of 874.1 kJ was required to reach 85.93% for Ni, 77.60% for Co, 64.04% for La, 75.01% for Nd, and 57.17% for Ce, respectively under experimental conditions of 1 N of HCl, solid concentration of 20 g/L, 100◦C for 5 min. Novel acid leaching methods showed promising potential for metals recovery from e-waste.

Item Type:	Article
Additional Information:	Jurnal Internasional Bereputasi SJR(2021): 0.77, Q1, H-Index: 111
Uncontrolled Keywords:	Microwave-assisted extraction (MAE) Nickel-metal hydride batteries Process intensification Rare earth elements (REEs) Subcritical water extraction (SWE) Waste
Subjects:	Engineering > Chemical Engineering
Divisions:	Journal Publication
Depositing User:	F.X. Hadi
Date Deposited:	19 Aug 2022 06:17
Last Modified:	13 Sep 2022 03:59
URI:	http://repository.ukwms.ac.id/id/eprint/31913

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