130 0 0 0 OA フェロニッケルスラグを利用したリン酸質肥料
25 0 0 0 OA ケイ酸ソーダの最近の用途
3 0 0 0 OA 炭酸カルシウム配合のポリエチレン製ごみ袋-東京都の新しいごみ処理システムをめぐって
- 著者
- 鶴田 康生
- 出版者
- 無機マテリアル学会
- 雑誌
- 石膏と石灰 (ISSN:21854351)
- 巻号頁・発行日
- vol.1994, no.250, pp.195-201, 1994-05-01 (Released:2011-03-07)
- 参考文献数
- 6
2 0 0 0 OA 純水における硫酸カルシウムの溶解度表示式
- 著者
- 安達 正雄 谷本 明
- 出版者
- 無機マテリアル学会
- 雑誌
- 石膏と石灰 (ISSN:21854351)
- 巻号頁・発行日
- vol.1975, no.135, pp.63-72, 1975-03-01 (Released:2011-03-07)
- 参考文献数
- 75
To analize mechanism of calcium scale deposit on heated wall in evaporator, accurate solubility data of calcium sulfate in pure water are required, but satisfactory data are not available from databooks. Therefore, an attempt to determine the equations which represent accurately the solubility of calcium sulfate is performed.All the solubility data which are taken from available original literatures are classified in five groups corresponding to modifications of calcium sulfate, i. e. dihydrate, α-and β-hemihydrate, soluble anhydrite and insoluble anhydrite. The equations for each group are determined by so-called double-minimum-square method using digital computor FACOM 230-35 of Kanazawa University.It is found that all the data for soluble anhydrite are obviously classified in two groups. Because of this fact and the other verification, two types of α and β exist in soluble anhydrite. At last, the equations of solubility for six modifications of calcium sulfate are presented. Deviation of the data from the equations are less than ±10% for temperature ranges from 0 to 170 or 200°C, but for dihydrate ±-1%, 0 to 110°C.It seems that the given each equation of solubility for modifications of calcium sulfate is the most accu-rate, comparing with the other's solubility equations.
2 0 0 0 OA 実験固体化学入門 (X)
2 0 0 0 OA 窒化マグネシウムおよび関連化合物の諸性
2 0 0 0 OA キレート滴定の諸問題と, 石灰石, ドロマイト露頭における化学成分の変動について
1 0 0 0 OA せっこうボードの歴史と現況について
- 著者
- 今野 正
- 出版者
- 無機マテリアル学会
- 雑誌
- 石膏と石灰 (ISSN:21854351)
- 巻号頁・発行日
- vol.1970, no.108, pp.182-189, 1970-09-01 (Released:2011-03-07)
1 0 0 0 OA 人工宝石
- 著者
- 兒嶋 弘直
- 出版者
- 無機マテリアル学会
- 雑誌
- 石膏と石灰 (ISSN:21854351)
- 巻号頁・発行日
- vol.1988, no.214, pp.177-182, 1988-05-01 (Released:2011-03-07)
1 0 0 0 OA 多孔質ガラスの合成と応用
1 0 0 0 OA 硬化コンクリートの空隙構造とその物性
1 0 0 0 OA 炭酸カルシウムフィラーの進歩
- 著者
- 貫井 徳蔵
- 出版者
- 無機マテリアル学会
- 雑誌
- 石膏と石灰 (ISSN:21854351)
- 巻号頁・発行日
- vol.1990, no.228, pp.303-309, 1990-09-01 (Released:2011-08-16)
- 参考文献数
- 27
1 0 0 0 OA 石膏の凝結に関する研究 (第4報)
1 0 0 0 OA 塩基性炭酸マグネシウムの水溶液反応
- 著者
- 松田 伸一 池上 隆康 小浜 弘之
- 出版者
- 無機マテリアル学会
- 雑誌
- 石膏と石灰 (ISSN:21854351)
- 巻号頁・発行日
- vol.1986, no.202, pp.142-151, 1986-05-01 (Released:2011-03-07)
- 参考文献数
- 20
Magnesium basic carbonate was synthesized by using so called “the sodium carbonate method”. The process composed of following steps such as precipitation and dissolution of the amorphous basic carbonate, crystallization and dissolution of the carbonate (nesquehonite), and the formation of the basic carbonate.The results obtained are summarized as follows : 1) The crystallinity of nesquehonite depends on the concentration ratio of [CO32-] / [OH-] 2.2) The formation rate of the basic carbonate depends on the dissolution rate of nesquehonite and the concentration ratio of [OH-] / [HCO3-].3) The composition of basic carbonate depends on aging conditions, that is 4MgCO3·Mg (OH) 2·8H2O is stable at high concentration of [OH-] and low temperature, 4MgCO3·Mg (OH) 2·5H2O (dypingite) is stable at low concentration of [OH-] and high tempbrature.4) Ultimate composition of basic carbonate depends on the drying temperature. 4MgCO3·Mg (OH) 2· 5H2O (giorgiosite) is stable at room temperature, on tne other hand, 4MgCO3·Mg (OH) 2·4H2O (hydromagnesite) is stable at about 110 °C.Above results indicate that the concentration of initial solution, the aging temperature, and the pH of mother's solution play the important role on the synthesis of magnesium basic carbonate.
1 0 0 0 OA ドロマイトの高温焼成
- 著者
- 宮沢 清
- 出版者
- 無機マテリアル学会
- 雑誌
- 石膏と石灰 (ISSN:21854351)
- 巻号頁・発行日
- vol.1969, no.103, pp.332-337, 1969-11-01 (Released:2011-03-07)
- 参考文献数
- 10
1 0 0 0 OA 高炉スラグの鉱物組成
1 0 0 0 OA セルフレベリング材
- 著者
- 小俣 一夫
- 出版者
- 無機マテリアル学会
- 雑誌
- 石膏と石灰 (ISSN:21854351)
- 巻号頁・発行日
- vol.1989, no.222, pp.262-268, 1989-09-01 (Released:2011-03-07)
- 参考文献数
- 18
1 0 0 0 ソ連産コラリン鉱石より得られる半水セッコウについて
The calcium sulfate hemihydrate obtained by the decomposition of the Kola Phosphate Rock with H<SUB>2</SUB>SO<SUB>4</SUB> fairly differs from a common calcium sulfate hemihydrate in physical and chemical properties.<BR>The time of hydration of this hemihydrate is extremely long in 30% P<SUB>2</SUB>O<SUB>5</SUB> solution or water.<BR>This is caused by the peculiarity of the crystalline formation of the hemihydrate, and the results of the study are summarised as follows.<BR>(1) Though the common hemihydrate from the Florida rock contain about 0.07% Sr, this hemihydrate is characterized by containing high content of it about 1. 5% Sr.<BR>(2) By the precise measurement of X-ray diffraction patterns, it is made clear that the crystal lattice of the hemihydrate slightly expends as compared with the hemihydrate from Florida rock.<BR>This phenomenon will be explained because ionic radius of Sr is longer than that of Ca and the solid solution of strontium sulfate in calcium hemihydrate will be formed.<BR>(3) As this hemihydrate is much easier to lose the crystal water than that from Florida rock, the crystal water decreased to about 3% after five days in desicator, but that from Florida rock does not lose crystal water in desicator.
1 0 0 0 OA 桂離宮昭和大修理における土壁材料
- 著者
- 山田 幸一
- 出版者
- 無機マテリアル学会
- 雑誌
- 石膏と石灰 (ISSN:21854351)
- 巻号頁・発行日
- vol.1983, no.186, pp.243-249, 1983-09-01 (Released:2011-03-07)
1 0 0 0 OA 多孔体の吸水現象について
- 著者
- 近藤 連一 大門 正機 大沢 栄也
- 出版者
- 無機マテリアル学会
- 雑誌
- 石膏と石灰 (ISSN:21854351)
- 巻号頁・発行日
- vol.1971, no.112, pp.92-96, 1971-05-01 (Released:2011-03-07)
- 参考文献数
- 12
The equations showing the relationship between the rate of water absorption and the pore size of porous materials were studied in connection with the water absorption phenomena in consideration of the various capillary models and also new equations were tentatively derived.The water absorption experiments were done by using hydrated α and β-CaSO4·1/2 H2O for examples and the previonsly mentioned equations were applied to the results and some discussions were made. The electrical resistance which changes with absorption of the ionic solution into the specimen was measured for the calculation of the through pore size distribution.The results showed that in the case of β-CaSO4·1/2 H2O, the varying radius capillary model in which each capillary has various radius was in good accordance with the structure estimated by the mercury penetration method and the scanning electron microscope observation. While, the pore size distribution of α-CaSO4·1/2 H2O showed good accordance with the meandering capillary model rather than that with the varying radius model. The straight capillary model might be in general inadequate. These facts seem to indicate that the tortuosity is related with either the variation of radius in each capillary or the meandering of each capillary, varying with the sort of specimen.It was found that the method to measure the rate of water absorption is valuable to study the pore structure of the materials.