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
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.
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
著者
湊 秀雄
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.1977, no.147, pp.80-88, 1977-03-01 (Released:2011-03-07)
参考文献数
4
被引用文献数
2
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
著者
園田 博男
出版者
無機マテリアル学会
雑誌
Journal of the Society of Inorganic Materials, Japan (ISSN:21854378)
巻号頁・発行日
vol.9, no.300, pp.261-266, 2002-09-01 (Released:2011-03-07)

無機マテリアル学会から通巻300号を記念して, 技術史的観点から「石灰」の製造ならびにその技術革新を回顧してもらいたいとの要請があった.日本石灰協会の諸先輩がこれまでに取りまとめた資料, 文献を参考にして, 紹介を試みる.石灰は日本に唯一豊富に賦存する鉱物資源であり, 環境に優しい21世紀に更なる役割が期待されている素材でもある.この拙稿が無機マテリアル学会の明日の技術発展に役立てば幸甚である.
著者
小林 敏勝
出版者
無機マテリアル学会
雑誌
Journal of the Society of Inorganic Materials, Japan (ISSN:21854378)
巻号頁・発行日
vol.11, no.313, pp.371-376, 2004-11-01 (Released:2011-03-07)
参考文献数
7
被引用文献数
1
著者
村上 恵一 田中 弘文 成田 光昭 三塚 雄一
出版者
無機マテリアル学会
雑誌
石膏と石灰
巻号頁・発行日
vol.1966, no.84, pp.163-169, 1966

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.