韓国慶尚道尚州産セピオライトについて
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概要
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Sepiolite specimen which was imported from Korea, as a sample of industrial materials. has been investigated by means of X-ray, thermal method and chemical analysis. It occurs near Sangju, Kyongsangpuk-Do, associated with tremolite and other minerals, and forms aggregates of fine fibers. The material has white colour, soft and pliable and looks like leather. It is difficult to grind into fine powder. The data of X-ray powder diffractions both on no treated material and heated materials in various temperatures suggest that the specimen is of well crystallized α-sepiolite, with unit cell parameters of a_0=13.50Å, b_0=26.94Å, and c_0=5.28Å, which is calculated in orthorhombic system. On the TGA curve for the sepiolite, the second and third weight loss of 5.8% from 250℃ to 450℃ and from 450℃ to 620℃ correspond to dehydrations of bound water. The final weight loss of 3.3% between 620℃ and 1000℃ shows dehydration of hydroxyl water. The chemical compositions of the sepiolite is given in Table 4 and indicate that the material belongs to the common Mg rich sepiolite. The structural formulae calculated from the chemical analysis, on the basis of "dehydration sepiolite" after Brauner and Preisinger's formulae, is as follows, (Si_<11.92>Al_<0.04>Fe^<3+>_<0.04>)(Fe^<3+>_<0.06>Fe^<2+>_<0.01>Mg_<7.95>)O_<32>. The chemical compositions as well as thermal properties on the Sangju sepiolite support that the structure of sepiolite is suitable for the Brauner and Preisinger's model rather than that of Nagy and Bradley's model.
- 日本粘土学会の論文
- 1969-11-20
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