X
Logo Minería
login

Inicie sesión aquí

CHEMICAL AND ELECTROCHEMICAL KINETIC APPROACH IN CEMENTATION REACTIONS OF DISSOLVED METALS IN AQUEOUS ELECTROLYTES

Por: Julio Bonelli A., Consultor Metalúrgico.


Abstract

Cementation systems have played an important role in the world's mining and metallurgical industry since time immemorial, and in some cases continue to do so.  

They are apparently very simple and spontaneous reactions involving the displacement of a dissolved metallic element by another more reactive solid metal to precipitate the more noble one in the form of a so-called cement and leaving a very low concentration of the latter in the spent solution. 

The Cu++/Fe0 y Co++, Cu++, AsO2H/Zn0 cementation systems are the ones that will be analyzed from a chemical kinetic and electrochemical approach with the purpose of knowing how they occur and what knowledge can be extracted from these fundamental studies in order to use them in the design of appropriate reactors for the purposes pursued in each one of them.

In the case of copper cementation with iron scrap, chemical and electrochemical approaches have been analyzed, where both have agreed that this reaction is controlled by a phenomenon of molecular diffusion of cupric ions through the immobile liquid film.  

We also analyze the influence of the tank on the reaction progress taking into account the practical aspects of the operational part. We explain how a cementation reactor should be in order to meet the objectives of industrial practice.  

On the other hand, the second cementation system to be discussed, which refers to the purification of zinc sulfate solutions, for the removal of cobalt within the zinc electrolytic process, employs activators such as copper, arsenic or antimony, in order to achieve a more efficient cobalt precipitation with a reasonable consumption of zinc powder.  

Several fundamental studies are discussed with the purpose of understanding the role of activators in cobalt removal reactions. There are different points of view, all of them respectable, that aim to explain the role of activators.  

A different type of reactor is also presented, which could be the solution to the deficiencies and lack of control suffered by the conventional systems used for the purification of zinc sulfate solutions. At the end, a list of specific references on both cementation systems is presented. 


Artículos relacionados

En esta edición: PERUMIN, Gold Fields y reunión regional de profesores

Seguir leyendo

Déficit de infraestructura en Apurímac, Cusco y Puno debe ser abordado con inversión de calidad

Seguir leyendo
X

Ingrese sus datos aquí

X

Recuperar Contraseña

X

Recuperar Contraseña

Si tiene problemas para recuperar su contraseña contáctese con el Área de Servicio al Asociado al teléfono 313-4160 anexo 218 o al correo asociados@iimp.org.pe

X

Ha ocurrido un error al iniciar sesión

Si tiene problemas para recuperar su contraseña contáctese con el Área de Servicio al Asociado al teléfono 313-4160 anexo 218 o al correo asociados@iimp.org.pe

X

Ingrese sus datos y nos pondremos en
contacto para poder completar su compra

X

Ingrese sus datos y nos pondremos en
contacto para poder completar su compra