巻号一覧
14 巻 (1974 - 1975)
- 4 号 p. 99-
- 3 号 p. 71-
- 2 号 p. 35-
- 1 号 p. 1-
14 巻, 2 号
選択された号の論文の3件中1～3を表示しています
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音馬 峻, 竹 滋雄1974 年 14 巻 2 号 p. 35-44
発行日: 1974/08/25
公開日: 2011/09/20
ジャーナル フリーFibril diameters of cross fiber chrysotile asbestos from different localities with sufficient strength for practical purposes were measured, and the correlation of fibril diameters and softness of fibers was discussed. Some morphological observations were made also.
The outside fibril diameters of majority of samples were between 330Åand 350Åwith a mean diameter of 337Å, and those of with rather special properties were less than 300Å. The inside diameters of all the samples were between 50Åand 70Åwith a mean diameter of 56Å.
It was concluded that there is no correlation between fibril diameters and softness of fibers, although it seemed there is some.
Comparison between the surface area calculated from fibril diameter and the BET surface area of defibrillated fiber suggested that the internal surface of fibril has no contribution to the BET surface area, and it was inferred from the fact mentioned above that the fibrils were filled with intrafibriller materials.
Some samples shows difficulty for perfect defibrillation as compared with the others, which might be caused that the bonding strength between fibrils for these samples is partially strong.抄録全体を表示PDF形式でダウンロード (6022K) -
ハイドロサルファイトによる還元処理-III大津賀 望, 林 剛, 岡西 和人, 素木 洋一1974 年 14 巻 2 号 p. 45-57
発行日: 1974/08/25
公開日: 2011/09/20
ジャーナル フリーSodium dithionite is used for the iron removal in clay industry, because this reducing agent is easy to handle and has strong reducing action.
On the removal of iron oxide from clays with sodium dithionite-sulfuric acid solution (pH2-3), the reducing agent is used not only for the reductio n of Fe3+to Fe2+but for the reaction with atmospheric oxygen and the self-decomposition reaction, therefore it is necessary to determine effective conditions of the reduci ng reaction.
But the reducing reaction is very rapid, it is difficult to pursue the process of the reaction with chemical analysis.
In this experiment, the removal reaction of iron oxide from “Ohata” clay with sodium dithionite-sulfuric acid was investigated with the changes of oxidatio n-reduction potential, pH and the amount of dissolved oxygen.
Following results were obtained.
1) Sodium dithionite was used for the reaction with atmospheric oxyge n and the self-decomposition, and the reduction ability was lost above-200mV (Pt-s. c. e.) of the oxidation-reduction potential.
2) The changes of pH and the amount of dissolved oxygen were correlati ve with the change of oxidation-reduction potential.
3) The dissolved iron ions were ferrous state, and the change of Fe2+to Fe3+was begun when the change of oxidation-reduction potential became little.抄録全体を表示PDF形式でダウンロード (1134K) -
笹木 敏1974 年 14 巻 2 号 p. 58-70
発行日: 1974/08/25
公開日: 2011/09/20
ジャーナル フリーThe Quaternary clay which occurs along the margin of the Kitami basin, Hokkaido, -to be called Kitami clay-has been known as very sensitive as those of the “Quick clay” in southern Scandinavia and eastern Canada.
The present geological study proved that this clay resembles to the varved clays as shown by its properties as follows:
1. The clay assumes thin bedded and intercalated in the Kutcharo volcanic ash formations.
2. About half of the specimens of the fossil diatoms in the clay is of lacustrin fresh, and another half is of high land lacustrin type.
3. The radiocarbon dating of the wood fragments from the clay gave the age from 23, 000 to 26, 800 years B. P., corresponding to Main Wurm Glacial stage.
4. The caly beds consist of the alternating lamina of summer silty layer and winter peaty layer.
5. By X-ray diffraction and differential thermal analysis, the clay minerals of the clay are identified mainly as halloysite accompanied with minor amount of kaolinite. This mineral composition greatly differs from the “Quick clay” mentioned above, inspite of the sensitive characteristics of the crude clay.抄録全体を表示PDF形式でダウンロード (13908K)
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