Projects per year
Abstract
In this research, the recycling of industrially collected and crushed nickel metal hydride battery waste, rich in valuable metals such as Ni and rare earth elements (REE), was investigated. The crushed waste was characterized based on elemental distribution per particle size class and density. Although issues with sieving, such as agglomeration of shredded separator fibers, were observed, a good separation of Fe and plastics could be achieved by using a 1-mm sieve size. It was observed that, as the waste battery particles were washed with water, some organic compounds were dissolved. Acid consumption of 14 mol H+ ions per 1 kg of battery sample (sieve fraction—1 mm) was determined to be sufficient to achieve the desired final pH of < 1. Selectivity of the leaching at higher equilibrium pH was also investigated by using dilute H2SO4. Pregnant leach solution rich in Ni (46 g/L) and REEs (La: 9 g/L, Ce: 7.5 g/L, Pr: 1.4 g/L, Sm: 0.29 g/L, Y: 0.17 g/L) was obtained and REE precipitation was investigated as a function of dilute Na2SO4 solution concentration (0.01–0.5 M) at a temperature of 50 °C. The best precipitation efficiency was achieved with a Na:REE ratio of 9.1, which resulted in a > 99% precipitation efficiency for the REEs.
Original language | English |
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Pages (from-to) | 78-90 |
Number of pages | 13 |
Journal | Journal of Sustainable Metallurgy |
Volume | 6 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Mar 2020 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Characterization
- Circular economy of metals
- Hydrometallurgy
- Mechanical processing
- NiMH batteries
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Dive into the research topics of 'Nickel Metal Hydride Battery Waste : Mechano-hydrometallurgical Experimental Study on Recycling Aspects'. Together they form a unique fingerprint.Projects
- 5 Finished
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BATCIRCLE: Finland-based Circular Ecosystem of Battery Metals
Lundström, M. (Principal investigator)
01/01/2019 → 30/04/2021
Project: Business Finland: Other research funding
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MINEWEE: Industrial mining ecosystem for metal-containing wastes and WEEE
Lundström, M. (Principal investigator)
17/01/2017 → 31/12/2018
Project: Business Finland: Other research funding
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Closing the Loop for High-added-value Materials
Lundström, M. (Principal investigator)
01/04/2016 → 31/08/2019
Project: Academy of Finland: Strategic research funding