各種硫化鉱物の磁気的性質
1986 年 102 巻 1176 号 p. 85-89
詳細
1986 年 102 巻 1176 号 p. 85-89
As a basic research for the application of high gradient magnetic separation, the magnetic susceptibilities were measured in room temperature for some sulfide minerals;pyrite, chalcopyrite, bornite, chalcocite, covellite, sphalerite and galena. The susceptibilities of crystalline pyrites, except 0.46 × 10-6emu/g of colloform pyrite, gave low values of narrow range from 0.16 to 0.28 × 10-6 emu/g, which are independent of the magnetic force.Besides, pyrites from the metamorphic and metasomatic deposits caused to vary the magnetization intensity depending on magnetic force owing to the coexisting minor ferromagnetic minerals as magnetite, hematite and pyrrhotite.Against chalcopyrite, the susceptibility ranged the values from 2.8 to 7.0 × 10-6emu/g, but bornite showed a low value of 0.7 × 10-6emu/g.Sphalerites showed more positive susceptibilities with the increase of iron content, and the curve followed by the values is nonlinear which is similar to the curve, given by Keys et al.(1968).Chalcocite, covellite and galena are diamagnetic substantially.Nevertheless, the first one gave positive valueof 0.04 × 10-6emu/g and the second one 0.5 and 0.9 × 10-6emu/g.In galena only, the negative value was found as- 0.04 ×10-6 emu/g, but it is very small, as compared to pure synthetic PbS.It is thought that the deviations of susceptibilities of the above three minerals might have been caused by the presence of any magnetic impurity within them as iron in sphalerite.
