巻号一覧
40 巻 (2000 - 2001)
- 4 号 p. 218-
- 3 号 p. 152-
- 2 号 p. 66-
- 1 号 p. 1-
40 巻, 1 号
選択された号の論文の5件中1～5を表示しています
- |<
- <
- 1
- >
- >|
-
共存イオン濃度と前駆体生成時における中和滴定速度の影響鈴木 正哉, 大橋 文彦, 犬飼 恵一, 前田 雅喜, 渡村 信治2000 年 40 巻 1 号 p. 1-14
発行日: 2000/08/10
公開日: 2011/09/20
ジャーナル フリーAllophane and imogolite were synthesized from two kinds of monosilicic acid and aluminium trichloride, to study the influence of co-existing ion concentration and titration rate of NaOH on the interaction of aluminium ions with monosilicic acid on the synthetic formation of allophane and imogolite. Following results were obtained;
1) Imogolite was synthesized from 5mmol/l monosilicic acid or less, and allophane was synthesized from 10mmol/l monosilicic acid or more. Allophane was synthesized in the condition of high ion concentration, and imogolite was synthesized in the condition of low ion concentration.
2) The formation of allophane and imogolite were more influenced by the concentration of chloride ion than that of monosilicic acid, aluminum ion and sodium ion. The boundary condition of forming them was chloride ion of about 26 millimolar.
3) In the synthesis from sodium orthosilicate, titration rate of NaOH did not influence the formation of allophane and imogolite. But in the synthesis from 5mmol/l tetraethyl orthosilicate or more, as titration rate of NaOH grew faster, the formation of boemite increased in volume. Ethanol may influence the formation of proto-imogolite, thus hinder the subsequent formation of allophane and imogolite.抄録全体を表示PDF形式でダウンロード (1247K) -
犬飼 恵一, 渡村 信治, 前田 雅喜, 大橋 文彦, 鈴木 正哉, 木村 辰雄, 佐藤 博泰, 澤田 勉, 板原 弘幸2000 年 40 巻 1 号 p. 15-23
発行日: 2000/08/10
公開日: 2011/09/20
ジャーナル フリーTo purify the α-type sepiolite from Hunan, China with calcite as an impurity mineral, two types of HCl treatments were compared by their chemical composition, BET surface area, crystallite size estimated by Scherrer equation etc. Rheological properties were also measured for the purified sepiolite treated in bench scale.
1) By the simple addition of HC1 (treatment-A) without pH control, the calcite content was decreased from 29.5% to 1.7%, whereas the excess silica formed by the damaging of the sepiolite increased from 0% to 4.4%.
2) By the controlled HCl addition at pH 5 (treatment-B), the calcite content was decreased from 29.5% to 2.4%, and the excess silica was increased from 0% to 4.2%. The little differences between the results of the treatment A and B indicated that the thick-fibrous α-sepiolite has relatively high resistance against acid and the dissolution of calcite buffered the solution pH.
3) By the pH controlled HCl addition in bench scale (treatment-C), the calcite content was decreased from 36% to 2.9% and the excess silica was increased from 3.2% to 4.0%. An increase in viscocity at low share rate and thixotropy were observed for the slurry with the purified sepiolite, which indicates the applicability of the purified materials for the thixotropic additives.抄録全体を表示PDF形式でダウンロード (1016K) -
朝田 隆二, 田崎 和江2000 年 40 巻 1 号 p. 24-37
発行日: 2000/08/10
公開日: 2011/09/20
ジャーナル フリーMicrobiogenic kaolinite (bio-kaolinite) was observed on the surface of microorganisms in cultured biomat from water-soil system under natural conditions. The bio-kaolinite exhibits several different structural and micromorphological characteristics from that of usual standard kaolinite. Optical and electron microscopic observation revealed that very thin bio-kaolinite film covered on the surface of microorganisms. This kaolinite indicates almost the same XRD and EDX patterns except its high background. However, FT-IR analyses, exhibits characteristic absorptions of O-H (3651 cm-1), C-H and C-N (2925, 1454 and 1420 cm-1) bands indicative of organic origin. Atomic force microscopic observations also disclosed that orientated nano-meter scale bio-kaolinite formed clusters.抄録全体を表示PDF形式でダウンロード (13067K) -
林 剛, 笠原 正光, 田村 純正, 小川 宏, 半田 喜代二2000 年 40 巻 1 号 p. 38-45
発行日: 2000/08/10
公開日: 2011/09/20
ジャーナル フリーAn electro-osmosis apparatus equipped with porous carbon electrodes and with pressing and reducing filtration mechanisms was newly designed for the dehydration of aluminum hydroxidegels that were recovered in the process of waste water treatment at a mill that manufactures electrolytic aluminum foil. The reducing mechanism enabled easy release of the transuded solutions from the surface of carbon electrodes that also served as a filter. The pressing mechanism served to accelerate the decrease in water content by acting not only as a filter press but also as a suppressor of crack formation in the gels during electro-osmosis. The water content in aluminum hydroxide gels decreased to about 70mass% by the application of a dc field at 15V/cm (25mA/cm2) for 2h at pneumatic press pressure and aspirator pressure of 780kPa and 93kPa, respectively, while that in the gels dewatered by mechanical filtration could only be decreased to about 90mass% or less. The dewatering was accompanied by the transport of electrolytes dissolved in the gels as impurities, leading to an improvement in the purity of the recovered aluminum hydroxide. On the other hand, the dehydration efficiency during electro-osmosis decreased progressively with the decrease in electrical conductivity of the solution in the gels, and at the same time the electric power was consumed as Joule heat. The water that remained in the aluminum hydroxide after dehydration by electro-osmosis was evaporated easily by microwave drying.抄録全体を表示PDF形式でダウンロード (3285K) -
本宮 秀朋, 北川 隆司, 西戸 裕嗣2000 年 40 巻 1 号 p. 46-53
発行日: 2000/08/10
公開日: 2011/09/20
ジャーナル フリーNumerous pyrophyllite (“Roseki”) deposits occur in Cretaceous volcanic rocks distributed in Chugoku province, Southwest Japan. They are developed mainly in three areas; Abu-Susa (Yamaguchi Prefecture), Shokozan (Hiroshima Prefecture) and Mitsuishi areas (Okayama prefecture). K-Ar ages were determined for illite-bearing ores collected from “Roseki” deposits (Tsuchihashi, Yagi and Shinagawa mines) distributed in the Mitsuishi district. In particularly, specimens of various modes of occurrence (silicified, spotted, illiterich, vein-form, vein and pyrophyllite bearing) were mainly collected from Tsuchihashi deposit. The Tsuchihashi, Yagi and Shinagawa deposits are dated to be 73-80Ma, 76.9-78.7Ma and 77.6Ma, respectively.
The younger specimens are richer in K-ion than them of older. The latest stage of the alteration were confirmed in clay veins. Hydrothermal activity of the Mitsuishi district continued for almost lOMa in the Late Cretaceous period.抄録全体を表示PDF形式でダウンロード (957K)
- |<
- <
- 1
- >
- >|