Análisis de las principales variables de proceso que influyen en el rechazo de los cátodos durante el electrorrefino del cobre

Revista de Metalurgia (Impact Factor: 0.29). 06/2009; 45(3). DOI: 10.3989/revmetalm.0729
Source: DOAJ


An experimental circuit of copper electrorefining using three types of anodes coming from three different Chilean foundries: Hernán Videla Lira, Las Ventanas and El Teniente was used to simulate the electrorefining process. In this circuit the problem of the cathode rejection and the influence of some process variables in this phenomenon were studied. The variables analyzed were: electrolyte cell flow, solids in suspension, current density, lead doping in the anodes and density and particle size of the anodic slimes generated. The main results obtained from the experimental circuit were the following: the electrolyte flow doesn’t affect significantly the cathodic rejection, an increase of current density produces a decrease of cathodic rejections, the presence of the solids in suspension causes cathodes outside of norm, and to bigger quantity of lead in the anodes smallest were the rejections.Se trabajó en un circuito experimental de electrorrefinación de cobre, utilizando tres tipos de ánodos procedentes de tres fundiciones chilenas diferentes: Hernán Videla Lira, Las Ventanas y El Teniente. En este circuito, se estudió el problema del rechazo de cátodos y la influencia de algunas variables de proceso en este fenómeno. Las variables analizadas fueron: flujo de electrolito en la celda, sólidos en suspensión, densidad de corriente, dopado de plomo en los ánodos, densidad de los barros anódicos generados y tamaño de partícula de los barros anódicos. Los principales resultados obtenidos a partir del estudio del circuito experimental fueron los siguientes: el flujo de electrolito no afecta significativamente el rechazo de cátodos, a medida que aumenta la densidad de corriente disminuyen los rechazos, el aumento de los sólidos en suspensión provoca cátodos fuera de norma y a mayor cantidad de plomo en los ánodos menores fueron los rechazos.

Download full-text


Available from: Cristian Vargas
  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents a comparative review of process variables and anomalies that directly affect the key performance indicators (KPIs) in copper electrowinning processes. The KPIs under consideration are product quality, production level, and specific energy consumption. This paper describes industrial techniques used for measuring and monitoring those variables and discusses their importance for global process evaluation. The review shows that it is important to improve the measurement of electrolyte variables for a quick and precise diagnosis and better process behavior and production.
    No preview · Article · Jun 2015 · IEEE Transactions on Industry Applications
  • [Show abstract] [Hide abstract]
    ABSTRACT: This work characterizes raw and decopperized slimes, with the objective of identifying the phases in these two sub-products. The main phases in copper anodes are metallic copper, including CuO, which are present in free form or associated with the presence of copper selenide or tellurides (Cu2(Se,Te)) and several Cu-Pb-Sb-As-Bi oxides. During electrorefining, the impurities in the anode release and are not deposited in the cathode, part of them dissolving and concentrated in the electrolyte, and others form a raw anode slime that contains Au, Ag, Cu, As, Se, Te and PGM, depending on the composition of the anode. There are several recovery processes, most of which involve acid leaching in the first step to dissolve copper, whose product is decopperized anode slime. SEM analysis revealed that the mineralogical species present in the raw anode slime under study were mainly eucarite (CuAgSe), naumannite (Ag2Se), antimony arsenate (SbAsO4), and lead sulfate (PbSO4). In the case of decopperized slime, the particles were mainly composed of SbAsO4 (crystalline appearance), non-stoichiometric silver selenide (Ag(2−x)Se), and chlorargyrite (AgCl). © 2015 The Minerals, Metals & Materials Society and ASM International
    No preview · Article · Dec 2015 · Metallurgical and Materials Transactions B