巻号一覧
24 巻 (1984)
- 4 号 p. 137-
- 3 号 p. 89-
- 2 号 p. 47-
- 1 号 p. 1-
24 巻, 3 号
選択された号の論文の4件中1～4を表示しています
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中嶋 義晴1984 年 24 巻 3 号 p. 89-104
発行日: 1984/10/25
公開日: 2011/09/20
ジャーナル フリーRecent technological developments of the transmission electron microscope (TEM) including an analytical TEM are briefly reviewed with the principles for image formation by objective lens and chemical analysis by EXD and EELS.
New developments are mainly made for clean and high vaccum and easy use by CPU. Namely, clean and high vaccum made it possible to use LaB6 electron gun, convergent beam electron diffraction, reflection electron microscopy, electron energy loss spectroscopy, and so on. Computer control systems are also realized not only for analytical purposes but also for high resolution observation.
In the last section, the alteration process of pyroxene to clay minerals is described as an application of high resolution TEM observation. Augite from a gabbro in the Horoman ultramafic body, Hokkaido, has been found to be altered to double-chain, triple-chain, and more highly polymelized multiple-chain pyriboles and finally to clay minerals.抄録全体を表示PDF形式でダウンロード (16689K) -
林 剛, 大津賀 望1984 年 24 巻 3 号 p. 105-115
発行日: 1984/10/25
公開日: 2011/09/20
ジャーナル フリーThe flushing process was developed to achieve high purification of Roseki and kaolinite raw clays which contain abundant pyrite as impurity. Extraction of fine pyrite particles employing kerosene from clay slurry was performed with high efficiency by mechanical liberation of sulfide particles from silicates and by controlling the properties of particlesurface and slurry solution. The latter chemical conditioning for dispersion of particles and hydrophobicity of pyrite in the slurry was very important factor which influenced the separationefficiency, since the fine pyrite particles in the clay once digged out tend to be easily oxidized and flocculated strongly with clay particles.
By addition of separation-promotive agents such as reducing agent, chelating agent and surface active agent (collector), the dispersion of the slurry was increased remarkably because of elimination of influence caused by oxidized product of pyrite. With the clay samples containing a large amount of pyrite and resulting in increased oxidation, rejection of whole solution of the slurry in which much amount of iron ions was dissolved was necessary to satisfy the optimum conditions for higher sulfide extraction. Thus pyrite rejection from Okayama Roseki and Shiraoi kaolinite samples reached at over 90% respectively by the second step extraction. Pyrite showed the most appropriate condition for removing at pH 3-4 with the presence of sodium citrate, where citrate ions acted not only as a chelating agent for dissolved iron ions but also as a dispersant for clay sllurry because of adsorption on clay surface.抄録全体を表示PDF形式でダウンロード (11293K) -
小坂 丈予, 大津賀 望, 平林 順一, 岡田 清, 松井 久仁雄1984 年 24 巻 3 号 p. 116-129
発行日: 1984/10/25
公開日: 2011/09/20
ジャーナル フリーThe relation between sedimentary enviroments and clay minerals as wethering products of the Shimosueyoshi-Loam beds in the South Kanto district was examined by powder X-ray diffraction, DTA, CEC, TEM and chemical analyses of clay minerals and associated interstitial water. Some differencies were found in the particle shapes and stabilities of interlayer water of halloysites between in aqueous and aeolian tephra beds. Particle shape of halloysite in aqueous tephra beds is irregular shaped thin plate which is different from usual spheroidal and/or tubular shapes in aeolian tephra beds, and interlayer water of these platy halloysite was found to be more unstable than the others. This mineral may correspond with halloysite and metahalloysite mixde-layered mineral whith has been reported by Kurabayashi and Tsuchiya (1965). However, it shows only 10Å basal reflection and does not show 7Å one in the powder X-ray diffractogram under relative humidity of 100%, it was concluded to be halloysite 10Å mineral though having very unstable interlayer water. SiO2 concentrations of interstitial water associated with this platy halloysite are found to be apparently higher than those with spheroidal and/or tubular ones in aeolian tephra beds.
In the stability diagram of CaO (Na2O)-SiO2-Al2O3-H2O system, the data of aeolian tephra beds are plotted within the stability field of kaolinite, but those of aqueous tephra beds are plotted on the boundary of those between kaolinite and montmorillonite. It was then considered that a unipue sedimentary environment having a high SiO2 concentration of interstitial water may strongly affect the formation of this platy halloysite.抄録全体を表示PDF形式でダウンロード (7525K) -
1984 年 24 巻 3 号 p. 135
発行日: 1984年
公開日: 2011/09/20
ジャーナル フリーPDF形式でダウンロード (28K)
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