Green separation of lanthanum, cerium and nickel from waste nickel metal hydride battery
| Autor: | Luis Henrique Mendes da Silva, Silvia J. R. Vargas, Jamille C. Souza, Maria C. Hespanhol, Nicolas Schaeffer |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Aqueous solution 020209 energy Inorganic chemistry Extraction (chemistry) chemistry.chemical_element Cerium 02 engineering and technology 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Nickel Electric Power Supplies Dimethylglyoxime Nickel–metal hydride battery chemistry Lanthanum Metals 0202 electrical engineering electronic engineering information engineering Waste Management and Disposal Cobalt 0105 earth and related environmental sciences |
| Zdroj: | Waste Management. 125:154-162 |
| ISSN: | 0956-053X |
| Popis: | In a circular economy context, there is a growing need for more sustainable waste management options to recover elements from end-of-life materials. These “secondary ores” represent a source of critical elements that are often present in higher concentration compared to their primary ore. In this work, the recovery of lanthanum (La) from waste nickel metal hydride battery (NiMH) leachate is investigated using an aqueous biphasic system (ABS) process based on a pluronic triblock copolymer (L35). An initial screening is performed to determine the influence of the ABS phase forming salt anion and alizarin red extractant on the La extraction efficiency and selectivity. From these results, a three-step ABS process is developed, varying only the nature of the salt and requiring no additional extractant. In a first step, the ABS composed of L35 + thiocyanate ammoniun + H2O efficiently extracts iron, manganese, and cobalt leaving La, cerium, and Ni in solution. Nickel is subsequently recovered by precipitation using dimethylglyoxime. Finally, La is separated from cerium using the L35 + ammonium nitrate + H2O ABS, recovering 62 g of La with 94% purity per kilogram of black mass of NiMH battery. This work highlights the applicability of ABS for the treatment of raw and complex matrices, potentially allowing for a greener hydrometallurgical treatment of wastes. |
| Databáze: | OpenAIRE |
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