鉄質沈殿物の熱的性質

概要

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Ferrugineous sinters from various origins and synthetic hydrous ferric oxide were investigated by DTA, TG, and X-ray diffraction techniques and chemical analysis. The samples studied showed an endothermic peak at 100° due to dehydration and an exothermic peak at 850°, possibly due to the formation of α-Fe_2O_3. From DTA curve, natural samples can be divided in the following three groups: (1) Those having an endothermic peak at 650°, which is characteristic to the sinters formed at pH's below 5.4. The peak represents the elimination of SO_3. (2) Those having an exothermic peak at 650°, but without any weight loss. The sinters, high in SiO_2 and/or Al_2O_3 and formed at pH's above 5.6, belong to this group. (3) Those having exothermic peaks at 650° and 750°. No weight change was recorded for these peaks. The sinters of this group are similar to those the second group in the chemical composition, but low in SiO_2. The effect of formation pH on thermal behavior of the sinters was also confirmed by synthetic studies.
日本地球化学会の論文
1974-06-30