Separation of cobalt and nickel in leach solutions of spent nickel-metal hydride batteries using aqueous two-phase systems (ATPS)

被引：42

作者：

Valadares, Alberto ^{[1
,2
]}

Valadares, Clara Franca ^{[1
]}

de Lemos, Leandro Rodrigues ^{[3
]}

Mageste, Aparecida Barbosa ^{[4
]}

Rodrigues, Guilherme Dias ^{[1
]}

机构：

[1] Univ Fed Minas Gerais, Dept Quim ICEX, Ave Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG, Brazil

[2] Inst Fed Minas Gerais, Campus Sao Joao Evangelista,Ave Primeiro Junho, BR-39705000 Sao Joao Evangelista, MG, Brazil

[3] Univ Fed Vales Jequitinhonha & Mucuri, Dept Quim, BR-3910000 Diamantina, MG, Brazil

[4] Univ Fed Ouro Preto, Dept Quim, BR-35400000 Ouro Preto, MG, Brazil

来源：

HYDROMETALLURGY | 2018年 / 181卷

关键词：

Nickel; Cobalt; Aqueous two-phase system; e-waste; NiMH batteries; LIQUID-LIQUID-EXTRACTION; LITHIUM-ION BATTERIES; HYDROMETALLURGICAL SEPARATION; RECHARGEABLE BATTERIES; SOLVENT-EXTRACTION; TRIBLOCK COPOLYMER; BASE METALS; RECOVERY; NI; COPPER;

D O I：

10.1016/j.hydromet.2018.09.006

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

This paper presents the use of an aqueous two-phase system (ATPS) as an alternative to liquid-liquid solvent extraction for the selective removal of cobalt and nickel from nickel metal hydride batteries (NiMH). The optimized extraction conditions were determined with a leach liquor obtained from the NiMH battery residue as a matrix. The effect of several key variables on the metal extraction was evaluated: (i) extractant nature, (ii) pH, (iii) the ATPS-forming electrolyte, (iv) the ATPS-forming copolymer, (v) the ratio between the top and bottom phases, and (vi) liquor dilution. Process efficiency was measured by the percentage of cobalt (%E-Co) and nickel (%E-Ni) extraction and the separation factor between these metallic ions (beta(Co/Ni)). The highest cobalt extraction percentages were obtained for ATPS formed by L64 + Na2SO4 + H2O at pH 5.00, using 1-nitroso 2-naphtol (1N2N) extractant and a liquor dilution factor of 35. At these conditions, %E-Co and %E-Ni were 99.18% and 1.29%, respectively, and beta(Co/Ni) reached 9339 after three successive extraction steps.

引用

页码：180 / 188

页数：9

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