Abstract
In the present second report, pyrite cinder samples from Buzyun (Manchoukuo) and Syôwa Steel Works (Japan) were examined to determine the microscopic structures. Experiments were conducted concerning the reduction of the ore in hydrogen, the difference between MnS and FeS by making sulphur prints, magnetic intensity of some parts of cinders and magnetic separation, etc. It was found that the copper is contained as CuSO4, covelline, chalcopyrite and bornite; the iron as ferrous oxide, hematite and magnetite; and the sulphur as FeS and pyrrhotite. From these results, it was presumed that there are four layers in pyrite cinders.
