Copper Recovery From Ammonia Solutions Through Electro-Electrodialysis (EED)

Alkaline leaching with highly selective ammoniacal complexing agents is an interesting alternative for the treatment of copper concentrates. This treatment is beneficial for copper recovery because it allows the formation of soluble amines complexes, with cupric tetramine ( ) being the most stable....

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Published inFrontiers in chemistry Vol. 8; p. 622611
Main Authors Garrido, Belen, Cifuentes, Gerardo, Fredes, Pedro, Pino, Eduardo, Calderón, Cristian, Cifuentes-Cabezas, Magdalena
Format Journal Article
LanguageEnglish
Published Switzerland Frontiers Media S.A 28.01.2021
Subjects
ammoniacal complexing agent
cationic ion exchange membrane
Chemistry
copper electrowinning
cupric tetramine
electro-electro dialysis
cupric tetramine
ammoniacal complexing agent
cationic ion exchange membrane
copper electrowinning
electro-electro dialysis
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Summary:Alkaline leaching with highly selective ammoniacal complexing agents is an interesting alternative for the treatment of copper concentrates. This treatment is beneficial for copper recovery because it allows the formation of soluble amines complexes, with cupric tetramine ( ) being the most stable. In order to suppress the unit operation of solvent extraction (SX) and move directly to the electrochemical process, an electro-electrodialysis (EED) process using ion exchange membranes to obtain copper is proposed. The study contemplates the operation with synthetic ammonia solutions containing copper at different concentrations and current density under standard conditions of pressure and temperature. The presented data demonstrate that the concentration of copper in the solution and the excess of ammonia are inversely related to the efficiency of the current and the voltage of the cell, whereas an increase in current density causes an increase in current efficiency, contrary to what happens in sulfuric systems.
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Reviewed by: Kasibhatta Siva Kumar, Sri Venkateswara University, India
This article was submitted to Physical Chemistry and Chemical Physics, a section of the journal Frontiers in Chemistry
Ranjan Dey, Birla Institute of Technology and Science, India
Edited by: Doo Soo Chung, Seoul National University, South Korea
ISSN:2296-2646
2296-2646
DOI:10.3389/fchem.2020.622611