The metals’ manufacturing industry practice for electro-winning of minerals’ leaching solutions at the extraction mines has been around for dozens of years worldwide. In particular, you will find processes that use Chlorine to attack the mineral while others use Sulphuric Acid. In this section we will discuss the application of Chlorine; in the section dedicated to the Anodes for Oxygen we analyse instead the use of sulphuric solutions.
The metals typically involved in this process are Nickel and Cobalt.
The solution obtained contains the metal in the form of cation in variable quantity, normally around 100 g/lt along with a variable quantity of chlorates and sulphates, depending on the leaching process used.
The metal’s deposition happens through electrolysis of these solutions, with the metal depositing on the Cathode, usually a steel or titanium sheet, whereas for the Anode the Chlorine evolution mixed with a certain percentage of Oxygen takes place.
Anodes are in Titanium with different geometries, in sheet, network or circle, and are supplied with separators or diaphragms which serve the purpose of preventing the diffusion of chlorine produced in the Cathode compartment.
The coating is in Ruthenium Oxide or Iridium Oxide either separately or in combination, with varying proportions depending on the solutions’ compositions. The Titanium needs to be pre-treated to resist to possible inversions caused by the short circuits due to the occasional growth in Cathode dendrites.
We supply the new Anodes based on the client’s drawings, as well as the re-coating and repairing service for the worn-out Anodes.