The magnetokinetics of oxidation of pyrite (FeS₂)

Abstract

The oxidation cf pyrite has been so far studied by standard methods such as TGA and DTA, whereas we have used a new magnetokinetic approach for studying such oxidation processes. The kinetics are followed using a vibrating sample magnetometer as a probe to quantify the magnetic parameters of the intermediate and final reaction products, as a continuous function of time at specific temperatures, and as a function of their particle size and superparamagnetic properties. The technological relevance of our work stems partly from the possible magnetic separation of pyrite from coal after its oxidation (or reduction) to ferri- and antiferromagnetic compounds. The results of such magnetokinetic studies are presented and capabilities of the magnetokinetic technique are exemplified in terms of unique results, which elude standard TGA and DTA techniques.