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Keywords = neodymium and praseodymium electrowinning

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15 pages, 15689 KB  
Article
Model and Mechanism of Anode Effect of an Electrochemical Cell for Nd or (Nd, Pr) Reduction
by Andre Luiz Nunis da Silva, Celia Aparecida Lino dos Santos, Rogério de Melo Riberio de Araújo, Dominic Feldhaus, Bernd Friedrich, Fernando José Gomes Landgraf and Roberto Guardani
Metals 2022, 12(3), 498; https://doi.org/10.3390/met12030498 - 15 Mar 2022
Cited by 8 | Viewed by 4196
Abstract
The anode effect can occur during neodymium and didymium oxide electrowinning, causing a surge in the electrochemical cell voltage, interrupting the process, and increasing the greenhouse gas emissions. In this work, we develop a mathematical model, based on the mass balance of gas [...] Read more.
The anode effect can occur during neodymium and didymium oxide electrowinning, causing a surge in the electrochemical cell voltage, interrupting the process, and increasing the greenhouse gas emissions. In this work, we develop a mathematical model, based on the mass balance of gas bubbles evolving from the anode, to understand the influence of some process parameters on the anode effect. The anode effect occurs due to bubble coverage and limitations on the mass transfer of the oxide species. Variables such as current density, oxide content, viscosity, and electrolyte composition play an important role in the anodic process. Finally, we propose a mechanism for the occurrence of the anode effect during Nd or Di (Nd–Pr) oxide electrolytic reduction based on models used in aluminum electrolysis. Full article
(This article belongs to the Special Issue Advances in Understanding Metal Electrolysis Processes)
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