October 2019
Volume 71    Issue 10

Circulation of sodium sulfate solution produced during NiMH battery waste processing

Porvali, Antti; Agarwal, Vivek; Lundstrom, Mari

ABSTRACT:

Full-text paper:
Mining, Metallurgy & Exploration, https://doi.org/10.1007/s42461-019-0086-2

Battery recycling is a topic that has rapidly gained momentum due to the ongoing electrification of societies and the need to conserve rare resources. Due to the metal-rich nature of current batteries, the battery recycling processes often employ metallurgical means in order to retain the metal values in the economy. Numerous studies have considered different ways of chemical processing to recycle the metals found in nickel metal hydride (NiMH) batteries. However, the generation of side streams is less commonly considered, especially in relation to recovery of the valuable metals. This study aims to improve understanding of the recycling of rare earth elements from NiMH batteries, while attempting to minimize reagent use, by using process modeling, by metamodeling the created process model to try to optimize the running parameters, and by performing laboratory-scale experiments mirroring the created process model.

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