Аннотация
Using Faraday Method of magnetic scale, it was found that magnetic pyrrhotites are formed during roasting of pyrite. When temperature increases up to 220°, magnetic permeability of pyrrhotites, Fe0.855S, Fe0.888S and Fe0.909S, dramatically increase, then falls to zero when temperature is increased further to 310–320°. At temperatures above 570°, an abrupt drop of magnetic permeability is observed, followed by consistent increases in magnetic permeability until reaching its peak at Fe0.855S = 3.75; Fe0.888S = 5.43; Fe0.909S = 2.18 SI unit at 700–800°. Electro-kinetic potentials of pyrrhotites increase with pH rising from pH 5 to 13, and decrease with reduction of the sulfur content from 52.1 mV for Fe0.85S to 40.8 mV for Fe0.89S.