<報文>選鑛實操業の鑛石學的檢討

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Various studies and experiments were undertaken to obtain better results in practical application of mineral dressing, but most of them were directed to the tests of the transfer of chemical components of the ores by means of chemical analysis, but little have been done to examine the transfer of the mineral components by means of microscopic examination. Under a microscope, not only the quantitative relations of the mineral ingredients, but also the liberation ratio of the ores, are clarified and the efficacy of the dressing methods can thus be grasped with substantial effectiveness. The authors of this report made a mineralographic research of the dressing method in practical operation, taking concentrates from Hatabira Dressing Plant of Tsuchihata Mine in Iwate Prefecture as objectives. Five samples of concentrates were classified according to the size of particles, and agglomerated and polished by each particle size class, to examine their liberation of component minerals and the volumetric contents under a microscope. The results are shown in Tables 1,3,5,7 and 9. The particle size distribution of the minerals in the concentrates deduced from these results are listed in Tables 2,4,6,8 and 10. Whether in its pure or partially separated form, pyrite and gangue mingled in concentrates cause the lowering of the grade of copper concentrates. The quantities of such admixtures are shown in Figures 2 through 8. On examining these figures, it is seen that chalcopyrite is distributed approximately evenly in all particle size classes, while pyrite tends to aggregate to the fine particle classes and gangue to the coarser side. Liberated pyrite and gangue are present there in a quantity roughly in a fixed ratio to the total content of each mineral. As for the mineral paragenesis, intergrowth of chalcopyrite and its secondary products is present in the largest quantity, followed by chalcopyrite-chalcocite, chalcopyrite-covellite, chalcopyrite-bornite, chalcopyrite-gangue, chalcopyrite-pyrite, and pyrite-gangue, in the order named, pyrite-secondary copper ores ana intergrowth of two kinds of secondary copper ores being hardly detected. If paragenetic particles of chalcopyrite and its secondary products are counted as simple chalcopyrite particles, the liberation ratio of the copper ores in entirety rises to more than 70%, whereas that for chalcopyrite only stands at around 65%. As shown in the above mentioned tables, improvement in dressing operation comes into consideration in the 2nd flotation, 7th flotation, 3rd flotation and 1st flotation, in the order named. If it is made possible to eliminate the simple pyrite and gangue particles in the concentrates, the grade of the produced copper will rise by 10% and the concentrate may be reduced by 28.7% in weight.
東北大学の論文
1953-03-25

<報文>選鑛實操業の鑛石學的檢討

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