Lanthanide-alkali double sulfate precipitation from strong sulfuric acid NiMH battery waste leachate

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Lanthanide-alkali double sulfate precipitation from strong sulfuric acid NiMH battery waste leachate. / Porvali, Antti; Wilson, Benjamin P.; Lundström, Mari.

In: Waste Management, Vol. 71, 01.2018, p. 381-389.

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@article{28b567c44c904241968a7f3a41909829,
title = "Lanthanide-alkali double sulfate precipitation from strong sulfuric acid NiMH battery waste leachate",
abstract = "In NiMH battery leaching, rare earth element (REE) precipitation from sulfate media is often reported as being a result of increasing pH of the pregnant leach solution (PLS). Here we demonstrate that this precipitation is a phenomenon that depends on both Na+ and SO4 2- concentrations and not solely on pH. A two-stage leaching for industrially crushed NiMH waste is performed: The first stage consists of H2SO4 leaching (2 M H2SO4, L/S = 10.4, V = 104 ml, T = 30 °C) and the second stage of H2O leaching (V = 100 ml, T = 25 °C). Moreover, precipitation experiments are separately performed as a function of added Na2SO4 and H2SO4. During the precipitation, higher than stoichiometric quantities of Na to REE are utilized and this increase in both precipitation reagent concentrations results in an improved double sulfate precipitation efficiency. The best REE precipitation efficiencies (98-99{\%}) - achieved by increasing concentrations of H2SO4 and Na2SO4 by 1.59 M and 0.35 M, respectively - results in a 21.8 times Na (as Na2SO4) and 58.3 times SO4 change in stoichiometric ratio to REE. Results strongly indicate a straightforward approach for REE recovery from NiMH battery waste without the need to increase the pH of PLS.",
keywords = "Double sulfate, Hydrometallurgy, Nickel metal hydride battery, Rare earths, Recycling",
author = "Antti Porvali and Wilson, {Benjamin P.} and Mari Lundstr{\"o}m",
year = "2018",
month = "1",
doi = "10.1016/j.wasman.2017.10.031",
language = "English",
volume = "71",
pages = "381--389",
journal = "Waste Management",
issn = "0956-053X",

}

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TY - JOUR

T1 - Lanthanide-alkali double sulfate precipitation from strong sulfuric acid NiMH battery waste leachate

AU - Porvali, Antti

AU - Wilson, Benjamin P.

AU - Lundström, Mari

PY - 2018/1

Y1 - 2018/1

N2 - In NiMH battery leaching, rare earth element (REE) precipitation from sulfate media is often reported as being a result of increasing pH of the pregnant leach solution (PLS). Here we demonstrate that this precipitation is a phenomenon that depends on both Na+ and SO4 2- concentrations and not solely on pH. A two-stage leaching for industrially crushed NiMH waste is performed: The first stage consists of H2SO4 leaching (2 M H2SO4, L/S = 10.4, V = 104 ml, T = 30 °C) and the second stage of H2O leaching (V = 100 ml, T = 25 °C). Moreover, precipitation experiments are separately performed as a function of added Na2SO4 and H2SO4. During the precipitation, higher than stoichiometric quantities of Na to REE are utilized and this increase in both precipitation reagent concentrations results in an improved double sulfate precipitation efficiency. The best REE precipitation efficiencies (98-99%) - achieved by increasing concentrations of H2SO4 and Na2SO4 by 1.59 M and 0.35 M, respectively - results in a 21.8 times Na (as Na2SO4) and 58.3 times SO4 change in stoichiometric ratio to REE. Results strongly indicate a straightforward approach for REE recovery from NiMH battery waste without the need to increase the pH of PLS.

AB - In NiMH battery leaching, rare earth element (REE) precipitation from sulfate media is often reported as being a result of increasing pH of the pregnant leach solution (PLS). Here we demonstrate that this precipitation is a phenomenon that depends on both Na+ and SO4 2- concentrations and not solely on pH. A two-stage leaching for industrially crushed NiMH waste is performed: The first stage consists of H2SO4 leaching (2 M H2SO4, L/S = 10.4, V = 104 ml, T = 30 °C) and the second stage of H2O leaching (V = 100 ml, T = 25 °C). Moreover, precipitation experiments are separately performed as a function of added Na2SO4 and H2SO4. During the precipitation, higher than stoichiometric quantities of Na to REE are utilized and this increase in both precipitation reagent concentrations results in an improved double sulfate precipitation efficiency. The best REE precipitation efficiencies (98-99%) - achieved by increasing concentrations of H2SO4 and Na2SO4 by 1.59 M and 0.35 M, respectively - results in a 21.8 times Na (as Na2SO4) and 58.3 times SO4 change in stoichiometric ratio to REE. Results strongly indicate a straightforward approach for REE recovery from NiMH battery waste without the need to increase the pH of PLS.

KW - Double sulfate

KW - Hydrometallurgy

KW - Nickel metal hydride battery

KW - Rare earths

KW - Recycling

UR - http://www.scopus.com/inward/record.url?scp=85032205354&partnerID=8YFLogxK

U2 - 10.1016/j.wasman.2017.10.031

DO - 10.1016/j.wasman.2017.10.031

M3 - Article

VL - 71

SP - 381

EP - 389

JO - Waste Management

JF - Waste Management

SN - 0956-053X

ER -

ID: 15952410