Recycling of spent NiMH batteries: Integration of battery leach solution into primary Ni production using solvent extraction

Research output: Contribution to journalArticleScientificpeer-review

Standard

Harvard

APA

Vancouver

Author

Bibtex - Download

@article{96de0dff2c71473d841406a44357eb9a,
title = "Recycling of spent NiMH batteries: Integration of battery leach solution into primary Ni production using solvent extraction",
abstract = "The utilization of existing metallurgical infrastructure and integration of secondary process streams into primary metals production can provide advantages over separate recycling plants. This paper focuses on the integration of a pregnant leach solution (PLS) into a nickel production plant that contains Ni, Co, Zn, Mn, Fe, Al and Cd ions, derived from a NiMH recycling stream. The solution composition highlights the challenge related to spent battery investigations, as although toxic Cd is not present in NiMH battery chemistries, it ends up into the battery waste collection and prevents direct integration of the battery waste into the primary process. The aim of the study is to remove Zn, Fe, Al, Mn and Cd ions from the PLS, so that the Ni and Co remaining in solution could be integrated into the nickel production process. A two-step solvent extraction process using Di-2-ethylheyxl phosphoric acid (D2EHPA) was developed. In the first step, Zn, Al and Fe were removed at pH 1.5, whereas in the second step Cd and Mn were removed at pH 2.3. Different process parameters (pH, O/A ratio, temperature, extractant concentration, kinetics) were optimized at each step of the solvent extraction. The purified and fully integrable PLS was found to contain Ni ~28 g/L and Co ~3.7 g/L.",
keywords = "Circular economy, McCabe-thiele diagrams, Solvent extraction, Spent NiMH batteries, Stripping",
author = "V. Agarwal and Khalid, {Muhammad K.} and A. Porvali and Wilson, {Benjamin P.} and Mari Lundstr{\"o}m",
year = "2019",
month = "12",
day = "1",
doi = "10.1016/j.susmat.2019.e00121",
language = "English",
volume = "22",
journal = "Sustainable Materials and Technologies",
issn = "2214-9937",
publisher = "Elsevier",

}

RIS - Download

TY - JOUR

T1 - Recycling of spent NiMH batteries

T2 - Integration of battery leach solution into primary Ni production using solvent extraction

AU - Agarwal, V.

AU - Khalid, Muhammad K.

AU - Porvali, A.

AU - Wilson, Benjamin P.

AU - Lundström, Mari

PY - 2019/12/1

Y1 - 2019/12/1

N2 - The utilization of existing metallurgical infrastructure and integration of secondary process streams into primary metals production can provide advantages over separate recycling plants. This paper focuses on the integration of a pregnant leach solution (PLS) into a nickel production plant that contains Ni, Co, Zn, Mn, Fe, Al and Cd ions, derived from a NiMH recycling stream. The solution composition highlights the challenge related to spent battery investigations, as although toxic Cd is not present in NiMH battery chemistries, it ends up into the battery waste collection and prevents direct integration of the battery waste into the primary process. The aim of the study is to remove Zn, Fe, Al, Mn and Cd ions from the PLS, so that the Ni and Co remaining in solution could be integrated into the nickel production process. A two-step solvent extraction process using Di-2-ethylheyxl phosphoric acid (D2EHPA) was developed. In the first step, Zn, Al and Fe were removed at pH 1.5, whereas in the second step Cd and Mn were removed at pH 2.3. Different process parameters (pH, O/A ratio, temperature, extractant concentration, kinetics) were optimized at each step of the solvent extraction. The purified and fully integrable PLS was found to contain Ni ~28 g/L and Co ~3.7 g/L.

AB - The utilization of existing metallurgical infrastructure and integration of secondary process streams into primary metals production can provide advantages over separate recycling plants. This paper focuses on the integration of a pregnant leach solution (PLS) into a nickel production plant that contains Ni, Co, Zn, Mn, Fe, Al and Cd ions, derived from a NiMH recycling stream. The solution composition highlights the challenge related to spent battery investigations, as although toxic Cd is not present in NiMH battery chemistries, it ends up into the battery waste collection and prevents direct integration of the battery waste into the primary process. The aim of the study is to remove Zn, Fe, Al, Mn and Cd ions from the PLS, so that the Ni and Co remaining in solution could be integrated into the nickel production process. A two-step solvent extraction process using Di-2-ethylheyxl phosphoric acid (D2EHPA) was developed. In the first step, Zn, Al and Fe were removed at pH 1.5, whereas in the second step Cd and Mn were removed at pH 2.3. Different process parameters (pH, O/A ratio, temperature, extractant concentration, kinetics) were optimized at each step of the solvent extraction. The purified and fully integrable PLS was found to contain Ni ~28 g/L and Co ~3.7 g/L.

KW - Circular economy

KW - McCabe-thiele diagrams

KW - Solvent extraction

KW - Spent NiMH batteries

KW - Stripping

UR - http://www.scopus.com/inward/record.url?scp=85070201688&partnerID=8YFLogxK

U2 - 10.1016/j.susmat.2019.e00121

DO - 10.1016/j.susmat.2019.e00121

M3 - Article

AN - SCOPUS:85070201688

VL - 22

JO - Sustainable Materials and Technologies

JF - Sustainable Materials and Technologies

SN - 2214-9937

M1 - e00121

ER -

ID: 36164452