巻号一覧
10 巻 (1970)
- 3-4 号 p. 79-
- 2 号 p. 39-
- 1 号 p. 1-
10 巻, 2 号
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坂本 陸泰1970 年 10 巻 2 号 p. 39-51
発行日: 1970/09/15
公開日: 2011/09/20
ジャーナル フリーThe Fukuoka Bentonite is widely distributed toward the sea in the northern area of the Chikuho Coal Field and is deposited in thickness of approximately 100 meters in the Onga Formation of the Oligocene Otsuji Group. Five or six workable seams have already been discovered, each having a thickness of from 2.5 to 5 meters. The amount of deposit is considerd to be almost unlimited.
The principal component of this bentonite is montmorillonite with the presence of quartz and felspar. Seam No.1 and one other seam only have a further content of cristobalite.
While the mol ratio of the amounts of aluminum oxide and silicic acid (SiO2/Al2O3) of Seam No.1 is in the order of 3. 7, the others are about 2. 5. Judging from its peculiarities, the seam appears, geologically, to form the key bed.
The Fukuoka Bentonite in every seam is of the Na type, and the amount of Na+ takes up 70to 80 percent of the total exchangeable cation, markedly resembling the bentonites produced in Rumania.
Besides thermal analysis and electron micrographic observations, several tests were conducted concerning 2 or 3 physical properties of bentonite and the Fukuoka Bentonite were compared with bentonites found elsewhere.抄録全体を表示PDF形式でダウンロード (4084K) -
木崎 喜雄1970 年 10 巻 2 号 p. 52-60
発行日: 1970/09/15
公開日: 2011/09/20
ジャーナル フリーThe Urushizawa Tuffs, which are pale greenish white ones of Neogene Epoch, developed around the upper reaches area of the Katashina River. Mica clay, chlorite and other minerals occur in these tuffs as alteration products. 38Å interstratified clay mineral occurs in a part of these altered tuffs. Prefered orientation X-ray patterns of the fine fraction of the specimen, containing 38Å clay mineral, show the irrational series of basal reflections, such as 38.4Å, 18.3Å, 11.6Å, 9.0Å, 4.91Å, 3.20Å, and 1.94Å. The refrection peaks of mica clay and chlorite can be seen in the same pattern. These reflection peaks of 38Å clay shift to 40.2Å, 19.1Å, 12.2Å, 9.32Å, 5.22Å, 3.31Å and 1.92Å by treatment with ethylene glycol. 38.4Å, 18.3Å, and 9.0Å reflection peaks disappear by heat treatment at temperature below 300°C. The other peaks remain, and shift to 9.9Å, 4.93Å, 3.26Å and 1.95Å by treatment at 400°C. Then, these reflection peaks slightly shift to low angle side as treatment temperature incleases, and coincide with the reflection peaks of mica clay by treatment at 800°C. The differential thermal analysis curve shows three endothermic peaks at 150°, 200° and 580°C, and a very weak exothermic peak at 950°C. 3% weight loss occurs by dehydration of interlayer water, and 4.3% weight loss occurs by dehydroxylation.
These data, above mentioned, suggest the presence of montmollironite and mica clay as constituent unit layers of 38A interstratified clay mineral.抄録全体を表示PDF形式でダウンロード (1093K) -
交換性陽イオンの影響高橋 浩, 西村 陽一1970 年 10 巻 2 号 p. 61-66
発行日: 1970/09/15
公開日: 2011/09/20
ジャーナル フリーThe effect of exchangeable cations on some physicochemical properties of mordenite by heat treatment was studied by the x-ray diffraction method and the measurement of specific surface area. Synthetic mordenite and mordenitic tuff from Shiroishi Miyagi Pref. were used as starting materials, from which Na-, Ca-and NH4-mordenite were prepared by cation exchange treatment.
The thermal stability of mordenite is different with exchangeable cations contained. The NH4-form is most stable and its structure remains unchanged up to 900°C. The structures of Na-and Ca-form are stable up to 800°C, but they are broken at 900°C.
The specific surface area of NH4-mordenite decreases gradually with increasing temperature and it corresponds to the structral change. Though the structures of Na-and Ca-mordenite are stable up to 800°C, the specific surface area decreases remarkably. It is because that partial sintering occurs with heat-treatment so that the pore is blocked and nitrogen molecules are not adsorbed in the main channel.抄録全体を表示PDF形式でダウンロード (682K)
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