巻号一覧
40 巻 (2000 - 2001)
- 4 号 p. 218-
- 3 号 p. 152-
- 2 号 p. 66-
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40 巻, 2 号
選択された号の論文の5件中1～5を表示しています
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林 剛, 浅賀 喜与志, 小島 良太, 田村 純正, 小川 宏2000 年 40 巻 2 号 p. 66-74
発行日: 2000/11/30
公開日: 2011/09/20
ジャーナル フリーA new setting agent consisting of amorphous aluminum hydroxide and calcium hydroxide was developed for the rapid solidification of waste drilling mud that arises in work sites such as those for civil engineering and construction. The model mud containing 50mass% of water, which was prepared using weathered granite (Masa soil) and bentonite, hardened within 10 minutes by the addition of the setting agent and with the aid of compressive forming mechanics. The water in the mud was mainly incorporated as essential water of calcium aluminate hydrate minerals such as 3CaO Al203 6H20 and 4CaO Al203 13H20 with some CO2-3and 3CaO Al203 CaCO3 12H20, which crystallized in a very short time. Part of the water was trapped in the gel structure formed in the first stage. The resulting briquette was of manageable strength.
The aluminum hydroxide that was recovered from industrial waste solution was applied effectively as an important component of the setting agent, and is favorable for use in the treatment of waste materials because of its reasonable cost.抄録全体を表示PDF形式でダウンロード (1229K) -
仮焼温度と再溶脱処理の複合効果前田 雅喜, 鈴木 正哉, 大橋 文彦, 渡村 信治, 岡田 清2000 年 40 巻 2 号 p. 75-82
発行日: 2000/11/30
公開日: 2011/09/20
ジャーナル フリーTo develop an effective alkali extraction of amorphous Si02 from calcined kaolinite for preparation of mesoporous material by the selective leaching method, synergy effect of calcining and selective leaching conditions were examined in this study. A Chinese kaolinitic clay sample was calcined at appointed temperatures (1000-1100°C) for 24hours. At the first leaching, 50g of the calcined sample was suspended in 1N KOH solution (50ml) at 90°C for 24hours, followed by washing and drying. At the second leaching, 10g of the selectively leached sample was suspended in 1N KOH solution (40-70ml) at 90°C for 24hours, followed by washing and drying.
The sample calcined at 1050°C and selective leaching under the condition with solid/liquid ratio at the second leaching being 1/5, showed the most sharp pore size distribution, the highest specific surface area of 83.8m2/g and total pore volume of 0.176ml/g. It was, however, difficult to remove amorphous silica less than 33% in these experimental conditions. It is suggested that the surface area of calcined sample is influenced by the solubility of amorphous silica in the leaching solution. Therefore, selection of raw material with high surface area is important in preparing mesoporous materials from kaolinitic clay by the selectively leaching method.抄録全体を表示PDF形式でダウンロード (964K) -
凝集領域による影響中石 克也2000 年 40 巻 2 号 p. 83-89
発行日: 2000/11/30
公開日: 2011/09/20
ジャーナル フリーWe have very little knowledge on the physical properties of the flock formed during the flocculation process, since it is more difficult to handle, both experimentally and theoretically, clay particles with irregular shapes than the spherical particles of monodispersion. In this study, the flocculation velocity of a kaolinite suspension was measured in a wide region, from the salt level at which flocculation begins to high salt concentration, and we used these data to examine how the porosity and size of the flock depend on the cohesion. The results were as follows.
In the slow flocculation region of salt level of 0.03mol/l or less, both the diameter and the porosity of the flock increased as repulsive force decreased. However, when the salt level exceeded 0.03mol/l even in the slow speed flocculation region, the flock diameter rapidly decreased, but there was almost no decrease in porosity.
In the rapid flocculation region where only van der Waals forces work, neither flock diameter nor porosity was dependent on the salt concentration.
The above results showed that the simple change in which the kaolinite flock becomes greater and denser did not occur here as the cohesion became stronger.抄録全体を表示PDF形式でダウンロード (861K) -
林 剛, 大津賀 望, 長谷川 孝, 河野 治人, 数野 晃久2000 年 40 巻 2 号 p. 90-99
発行日: 2000/11/30
公開日: 2011/09/20
ジャーナル フリーThe properties of a ball clay from Lansaka, Thailand, were compared with those of Klingenberg clay from Germany, which is used in manufacturing pencil leads due to its high plasticity. The clay fraction under 2μm in size in Klingenberg clay is mainly composed of kaolinite with a small amount of illite, and has a mean particle size of 0.4μm and a specific surface area of approximately 90m2/g. This clay is also characterized by a thermal property that the metastable transition period, from the temperature at which mullite begins to form to the temperature at which its growth stops, is long during heating. Lansaka ball clay resembles Klingenberg clay in some properties; both clays are composed of disordered kaolinite with fine particle size and are black due to the presence of carbonaceous organic substances. Furthermore, round grains with size on the micrometer order are commonly present in coarse fractions, presumably resulting from the disintegration during transport processes of the source rocks in rivers where fedspar is finely ground. On the other hand, the clay particles of Lansaka clay have a wider particle size distribution than those of Klingenberg clay because of the presence of a relatively large amount of illite, which results in a narrow metastable transition period during heating. Good moldability of pencil leads during the trial preparation was achieved by using Lansaka clay fractions under 10μm in size, which have a mean particle size of 1.7μm and a specific surface area of 27.1m2/g. The resulting pencil lead provided smoothness in writing with blackness of HB grade, although its bending strength was rather low because its firing temperature was above the optimum range.抄録全体を表示PDF形式でダウンロード (3901K) -
上原 誠一郎2000 年 40 巻 2 号 p. 100-111
発行日: 2000/11/30
公開日: 2011/09/20
ジャーナル フリーPDF形式でダウンロード (3119K)
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