Magnetic separation: economics and special applications

The choice of a separator is guided by criteria common to the different types of treatment, but also by the magnetic properties of the minerals, their mineralogy and their particle size. The first part of this article will therefore address the technical and economic criteria leading to the choice of a separator.

We will then look at some specific applications of magnetic separation, using a wide range of systems to remove iron particles from various products, and in particular to recycle metals using magnetic induction purification.

Rare earth permanent magnets also provide a simple, low-cost method of removing small particles of iron, magnetic stainless steel and iron oxide, in the form of rust and scale, which have been introduced into industrial minerals during processing or transportation, or in the manufacture of fine powders (foodstuffs, pigments, chemicals, pharmaceuticals...).

Numerous systems are available: grates, bars, filters, plates, etc., which can be adapted to any type of pipe for conveying powdered materials carried by a fluid (air or water).

The complete study of the subject includes the articles :

• "Magnetic separation: theory and modelling" ;

• "Low and high intensity magnetic separation" ;

• "High gradient magnetic separation (HGMS) and high field";

• [J 3 223] "Magnetic separation: economics and special applications" (this article) ;

• "Magnetic separation".