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Effect of Impurities in the Recovery of Critical Metals: The Case of Nickel Laterite in the Solvent Extraction Process

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Author(s):
de Amorim, Luiz Henrique Moura ; Aliprandini, Paula ; Botelho Junior, Amilton Barbosa ; Jimenez Correa, Monica Maria ; Espinosa, Denise Crocce Romano
Total Authors: 5
Document type: Journal article
Source: JOURNAL OF SUSTAINABLE METALLURGY; v. 8, n. 1, p. 10-pg., 2022-02-19.
Abstract

The search for new sources of critical metals faces a content decrease in mineral resources. Consequently, high impurities are present in the solution obtained in hydrometallurgical processing, which must be removed. For cobalt, it is crucial for Li-ion battery production, and iron is the main contaminant. However, there is a lack of literature about the co-extraction of target metals in impurities removal. The present work's goal was to study the co-extraction of cobalt from nickel limonite leach solution by solvent extraction. Experiments were carried out with Cyanex 272 in kerosene, and the effect of pH, temperature, and iron concentration were evaluated. Results showed that the extraction of iron and co-extraction of cobalt increased as the pH and temperature increased, achieving 85.1% and 37%, respectively, at 60 degrees C and pH 1.75. Cobalt extraction in solution without iron reached less than 8%. In bi-elementary solutions, co-extraction of cobalt was similar to the real solution when the Fe/Co concentration ratio was 225 and declined as the Fe/Co ratio decreased. The present study demonstrated that the presence of iron in different concentrations contributes to the co-extraction of cobalt. (AU)

FAPESP's process: 18/03483-6 - Kinect and thermodynamic studies for scandium recovery from Brazilian red mud using hydrometallurgical techniques
Grantee:Amilton Barbosa Botelho Junior
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 18/11417-3 - Obtaining Scandium from bauxite residue red mud by leaching process in acidic medium
Grantee:Jorge Alberto Soares Tenório
Support Opportunities: Regular Research Grants
FAPESP's process: 19/11866-5 - Development of innovative processes for the recovery of critical metals
Grantee:Denise Crocce Romano Espinosa
Support Opportunities: Research Projects - Thematic Grants