WILKOMIRSKY, I.; PARRA, R.; PARADA, F.; BALLADARES, E.:
Proceeding Copper 2013, Vol. IV, 136-150 (2013).
A physico–chemical/kinetic model is being proposed to explain the formation of bornite, chalcopyrite and magnetite during partial roasting of high–arsenic copper concentrates at 700ºC. The mechanism involves solid state-gas and solid–gas reactions between chalcosite, pyrrhotite and gaseous sulphur, and is thermodynamically consistent with the experimental results obtained in pilot plant.