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Volume 23 (1983)
- Issue 4 Pages 131-
- Issue 3 Pages 87-
- Issue 2 Pages 39-
- Issue 1 Pages 1-
Volume 23, Issue 4
Displaying 1-7 of 7 articles from this issue
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Recognition of a Possible New Intermediate MineralKoji WADA1983 Volume 23 Issue 4 Pages 131-136
Published: December 20, 1983
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSStudies on minerals featuring the 2: 1 to 1: 1 layer transformation such as 2: 1-2: 1: 1 intergrades and 2: 1/1: 1 mixed layer minerals were briefly reviewed. The identity of vermiculite-chlorite as one of those minerals was examined in the light of recent information obtained from studies on clay minerals in Korean Ultisols and Alfisols (Red-Yellow Soils). It was indicated that vermiculite is associated with kaolin mineral but not with polymer hydroxy-Al ions and that the mineral would be called an intergradient vermiculite-kaolin mineral. A possible structure of the new intergradient mineral was inferred to be that in which most vermiculite layers eachpartially transform into double kaolin layers.View full abstractDownload PDF (727K) -
Seiji SUGIURA1983 Volume 23 Issue 4 Pages 136-139
Published: December 20, 1983
Released on J-STAGE: September 20, 2011
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Shin-ichi ITO, Shin-ichi SUMI, Kazuo TORII, Toyoaki OKADA, Yoshiasa OK ...1983 Volume 23 Issue 4 Pages 139-148
Published: December 20, 1983
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSThe clays occurring in Kado, Iwaizumi, Iwate prefecture, are called “Iwate clay” which constitutes significant resources of refractory clay in Japan. Clays with higher iron content named “Koshitsu caly H4” and “Akaban clay” also occur in the deposit. They have not, however, been supplied as yet for industrial purposes because of their low refractoriness. The aim of the present study is to improve the properties of the “Iwate clay” by the removal of iron with the aid of a high gradient magnetic separation method (HGMS).
Experimental results revealed that the main source of iron components in those clays named “Koshitsu clay H4”, “Sofuto clay” and “Nanshitsu clay” was siderite and that the HGMS method had marked effect on the removal of siderite from those clays. Therefore, the values of iron removal by the HGMS treatment are dependent on the siderite contents in those clays. After the treatment for the “koshitsu clay H4”, iron contents decreased from 9.79 to 1.64wt%, and refractoriness was upgraded from SK 29 to SK 34 and whiteness increased from 49.1 to 82.5%. In the case of the “Sofuto clay”, whiteness increased from 77.6 to 89.8 % with decreasing iron contents from 2.35 to 1.84%. In the case of the “Nanshitsu clay”, whiteness changed from 81.6 to 85.6 % as iron contents changed from 2.23 to 2.11wt%. On the other hand, the “Akaban clay” contains hematite and magnetite in addition to the above mentioned iron source. Magnetite and siderite were easily removed by the HGMS treatment, whereas hematite remained because of their very small particle sizes. After the treatment the iron contents decreased from 5.69 to 3.26wt%, and whiteness increased from 57.1 to 60.7%.View full abstractDownload PDF (3889K) -
Kiyoshi OKADA, Joyo OSSAKA1983 Volume 23 Issue 4 Pages 149-158
Published: December 20, 1983
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSThe relations between some properties and their sedimentary ages were examined for halloysites of weathering origin in Japan. Properties examined include content of halloysite in each specimen, stability of interlayer water, thermal behavior and ratio of infrared absorbance for bands at 3700 and 3620 cm-1 (A3700/A3620). Halloysite contents were measured by DTA method. Stabilities of interlayer water were estimated from the existence probability of halloysite 10Å phase after the specimen was exposed to relative humidity of 30%(W30H). For this estimation, the X-ray diffraction profiles was simulated with mixed-layer models. For the examination of the thermal properties of halloysites temperatures of endothermic peaks at around 100 and 500°C and exothermic peak at around 1000°C, and slope ratios (a/b) of the endothermic peak at around 500°C on DTA curves were applied. With increasing age of sedimentation, following correlations are recognized as a general trend.(1) Halloysite contents in the specimens increases.(2) Stability of interlayer waters of halloysites decreases.(3) The peak temperatures and slope ratios of DTA curves of halloysites approach to those of kaolinites of disordered type.(4) The values A3700/A3620 in infrared spectra of halloysites approach to those of kaolinites. It is concluded that Properties of halloysites change and approach to those of kaolinites with increasing age of sedimentation.View full abstractDownload PDF (1041K) -
Nozomu OTSUKA, Tsuyoshi HAYASHI, Toyohiko YANO, Katsuichi SAITO, Shuji ...1983 Volume 23 Issue 4 Pages 158-168
Published: December 20, 1983
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSThe autoclave treatment was adopted for Na+ ion-exchange of the montmorillonite previously deironation-treated in order to prepare the Na-montmorillonite for use in the ceramic manufacturing as the material giving high plasticity. Osudo Ca, Mgmontmorillonite with a small amount of iron in the clay structure was refined by elutriation under 2μm and oxidation of the iron sulfide impurity with ozone at pH 2.5, then it was reacted with sodium hydroxide and sodium metasillicate respectively under the hydrothermal condition of temperature at 135-150°C (-3-5kg/cm2) for 24 hrs.
In each reaction, the silica components dissolving in the clay slurry acted fixing Ca2+ and Mg2+ ions which occupied about 25% of the total base exchangeable cations of the clay by forming the silicate compounds with low solubility, resulting the promotion of Na+ ion-exchange. By the treatment with sodium hydroxide, a nearly whole amount of H+ ions which were the main interlayer cation and a large part of Mg2+ ions were displaced by Na+ ions. Sodium hydroxide acted not only neutralizing the H+ ions on tne clay surface but also increasing the dissolution of the amorphous silica in the clay. In the reaction with sodium metasilicate, some conditioning reagent for decreasing the solubility of the silicate ions was necessary so that Na+ ions were displaced effectively as the counter-ions on the clay surface. When the p H of the slurry was lowered to 7 with hydrochloric acid, Na+ ion displacement improved with the decrease of the exchangeable Ca2+ and Mg2+ ions to a great extent. Na-montmorillonite with high quality was obtained without p H control by the treatment with sodium metasilicate plus silica sol, which presumably acted as the nuclei for polimerization of the silicate ions.View full abstractDownload PDF (1248K) -
Kyosuke MATAKAWA1983 Volume 23 Issue 4 Pages 168-171
Published: December 20, 1983
Released on J-STAGE: September 20, 2011
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1983 Volume 23 Issue 4 Pages e1
Published: 1983
Released on J-STAGE: September 20, 2011
JOURNAL FREE ACCESSDownload PDF (26K)
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