Circulation of Sodium Sulfate Solution Produced During NiMH Battery Waste Processing

Tutkimustuotos: Lehtiartikkeli

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@article{b021b26f14ed48f38fc34a4e065fcfc8,
title = "Circulation of Sodium Sulfate Solution Produced During NiMH Battery Waste Processing",
abstract = "Hydrometallurgical recovery of rare earth elements (REE) from NiMH battery waste can be performed using sulfuric acid leaching followed by selective precipitation as double salt (REENa(SO4)2·H2O) by adding Na2SO4 as a precipitating agent. The formed double salts can then be further converted with NaOH solution to form REE hydroxides. However, present literature has paid little attention to how to minimize the consumption of reagents in this recovery process. In the current study, a process model was built using HSC Sim software, and metamodeling of the simulated flowsheet was conducted with the design of experiments (DOE), after which the basic functionality of the flowsheet was verified by experimental work, starting from sulfuric acid leaching of spent batteries. As the process is based on chemical circulation internally in the process, the objective was to investigate the accumulation of the elements in solution, specifically Na+, K+, SO42− ions and impurities liberated in the NaOH conversion step. It was found out that metamodeling could be utilized in obtaining first estimate of the process behavior, prior to any experiments. Flowsheet functionality with circulated solution was confirmed, obtaining at best 96.9{\%} La recovery.",
keywords = "Battery waste, Flowsheet metamodeling, Hydrometallurgy, Rare earths, Recycling, Response surface methodology",
author = "Antti Porvali and Vivek Agarwal and Mari Lundstr{\"o}m",
year = "2019",
month = "6",
day = "12",
doi = "10.1007/s42461-019-0086-2",
language = "English",
journal = "Mining, Metallurgy & Exploration",
issn = "2524-3462",

}

RIS - Lataa

TY - JOUR

T1 - Circulation of Sodium Sulfate Solution Produced During NiMH Battery Waste Processing

AU - Porvali, Antti

AU - Agarwal, Vivek

AU - Lundström, Mari

PY - 2019/6/12

Y1 - 2019/6/12

N2 - Hydrometallurgical recovery of rare earth elements (REE) from NiMH battery waste can be performed using sulfuric acid leaching followed by selective precipitation as double salt (REENa(SO4)2·H2O) by adding Na2SO4 as a precipitating agent. The formed double salts can then be further converted with NaOH solution to form REE hydroxides. However, present literature has paid little attention to how to minimize the consumption of reagents in this recovery process. In the current study, a process model was built using HSC Sim software, and metamodeling of the simulated flowsheet was conducted with the design of experiments (DOE), after which the basic functionality of the flowsheet was verified by experimental work, starting from sulfuric acid leaching of spent batteries. As the process is based on chemical circulation internally in the process, the objective was to investigate the accumulation of the elements in solution, specifically Na+, K+, SO42− ions and impurities liberated in the NaOH conversion step. It was found out that metamodeling could be utilized in obtaining first estimate of the process behavior, prior to any experiments. Flowsheet functionality with circulated solution was confirmed, obtaining at best 96.9% La recovery.

AB - Hydrometallurgical recovery of rare earth elements (REE) from NiMH battery waste can be performed using sulfuric acid leaching followed by selective precipitation as double salt (REENa(SO4)2·H2O) by adding Na2SO4 as a precipitating agent. The formed double salts can then be further converted with NaOH solution to form REE hydroxides. However, present literature has paid little attention to how to minimize the consumption of reagents in this recovery process. In the current study, a process model was built using HSC Sim software, and metamodeling of the simulated flowsheet was conducted with the design of experiments (DOE), after which the basic functionality of the flowsheet was verified by experimental work, starting from sulfuric acid leaching of spent batteries. As the process is based on chemical circulation internally in the process, the objective was to investigate the accumulation of the elements in solution, specifically Na+, K+, SO42− ions and impurities liberated in the NaOH conversion step. It was found out that metamodeling could be utilized in obtaining first estimate of the process behavior, prior to any experiments. Flowsheet functionality with circulated solution was confirmed, obtaining at best 96.9% La recovery.

KW - Battery waste

KW - Flowsheet metamodeling

KW - Hydrometallurgy

KW - Rare earths

KW - Recycling

KW - Response surface methodology

UR - http://www.scopus.com/inward/record.url?scp=85069524553&partnerID=8YFLogxK

U2 - 10.1007/s42461-019-0086-2

DO - 10.1007/s42461-019-0086-2

M3 - Article

JO - Mining, Metallurgy & Exploration

JF - Mining, Metallurgy & Exploration

SN - 2524-3462

ER -

ID: 34644557