著者

小田部 廣男

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.1987, no.210, pp.307-316, 1987-09-01 (Released:2011-03-07)

参考文献数

9

著者

寺岡 一郎 伊藤 集〓

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.1956, no.22, pp.1175-1178, 1956-05-01 (Released:2011-03-07)

参考文献数

1

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When plaster of Paris is mixed with water in order to make a plaster mold, there takes place a phenomenon so called “segregation of water” in the mold. This phenomenon is one of the causes of the change of dimension of plaster mold. So called “Segregation” is caused by the excess water during setting of plaster. It can be explained exactly by means of measuring the water content, the micro-photo graph, and the thermal expansion of different parts of a mold. We have studied how to prevent the phenomenon and obtained some effective results.

著者

岡 淳平

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.1968, no.92, pp.15-23, 1968-01-01 (Released:2011-03-07)

参考文献数

4

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.1991, no.235, pp.531-546, 1991-11-01 (Released:2011-03-07)

参考文献数

15

著者

荒井 康夫 永井 彰一郎

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.1963, no.67, pp.245-252, 1963-11-01 (Released:2011-03-07)

参考文献数

3

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Observation were made on the mechanism of formation of forsterite in MgO-SiO2 system reactions and the transformation of the crystal lattice of forsterite accompanying the displacement of Mg2+ in the lattice by Fe2+ of varing amount in order to scrutinize the course of formation of olivine, which is known as a component mineral of serpentine rock and various slags. It was confirmed by this study that Fe2+ dissolves at first when olivine is dissolved with an acid. This rapid dissolution of Fe2+ was attributed to the larger affinity of Fe2+ to an acid solution than Mg2+. 10 kinds of silicate minerals related with MgO-SiO2 system were then synthesized to study on the relation between the structure of silicate and its acid solubilities. It was concluded that the acid solubilities of CaO-SiO2 system is rather high because the polarization effect of Ca2+ is smaller than that of Mg2+ and that this acid solubility is more with CaO-MgO-SiO2 system, which has dissolved Mg2+, because the clearance in the structure is larger, and that the acid solubilities of silicates are dependent on the polymerization degree of silicate ions which constitute the silicate and, consequently, orthosilicates with island structure is most soluble.

著者

石原 信一

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.1978, no.153, pp.75-80, 1978-03-01 (Released:2011-03-07)

参考文献数

24

著者

岩下 哲志

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.1991, no.234, pp.373-378, 1991-09-01 (Released:2011-03-07)

参考文献数

32

著者

河田 茂磨

出版者

The Society of Inorganic Materials, Japan

雑誌

石膏と石灰 (ISSN:21854351)

巻号頁・発行日

vol.1958, no.36, pp.139-147, 1958

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Mt. Funafuse is located about 30 km north of the city of Gifu, from which city there is available a bus service to Kanzaki where the mountain stands. The dolomite deposit occurs together with limestone in all places, and the group of these strata is named the Funafuse-Yama limestone group, which is distributed over a long distance from east to west with Mt. Funafuse in the center. Accordingly, it is considered that the dolomite deposit occurs likewise from east to west. This report describes the result of the writer's field survey in the eastern part in the neighbourhood of Kanzaki, Konjima and Iwodo.<BR>Judging from the fossils of <I>Fusulinids</I>, the Funafuse-Yama limestone group probably ranges from middle to upper of the lower permian system. The main genera are <I>Pseudofusulina, Pseudodoliolina, Parafusulina, Neoschwagerina</I>, etc., constituting the three fossil zones at the least.<BR>The strike and dip of the group can hardly be measured in many places ; but the general trend of strike is N. to S. and the strata dip either to the east or to the west. The group is divided into several blocks by the faults running along the strike or across the dip, constituting a complicated geologial structure.<BR>The grade of ore from the group is higher in SiO<SUB>2</SUB> content than that from Kuzuu, Tochigi Pref. Since the group contains laminae of chert and schalstein, the workable high-grade portion is rather limited, which, is worth surveying from the mining point of view with respect to it's distribution because it contains MgO over 17 % and SiO<SUB>2</SUB> below 2 %. Therefore, the writer has been conducting it's distribution survey.<BR>As for the mineral itself, the writer tested the existence of clay minerals in the insoluble residue by means of X-ray diffraction and differential thermal analysis. The test disclosed that it is composed of combined quartz, illite, chlorite, etc. From this studies conducted up to now, the writer is of the opinion that the characteristics of the insoluble residue is more similar to those of the insoluble residue of mesozoic limestone than those of Chichibu palaeozoic occurring without dolomite in the Kanto mountain districts. The writer is now of the opinion that this difference in composition characterizes the basin in which the limestone and dolomite were deposited, rather than difference in age of deposition as was considered in the initial stage of this studies. Another point that strikes the writer is that the dolomite deposit is closely related with black limestone in most places. It is considered this limestone rich in organic matters indicates that it had some bearing on the expedition of dolomitization which is considered to be related with upgrading the MgO component.

著者

河田 茂磨

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.1958, no.36, pp.139-147, 1958-09-01 (Released:2011-03-07)

参考文献数

3

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Mt. Funafuse is located about 30 km north of the city of Gifu, from which city there is available a bus service to Kanzaki where the mountain stands. The dolomite deposit occurs together with limestone in all places, and the group of these strata is named the Funafuse-Yama limestone group, which is distributed over a long distance from east to west with Mt. Funafuse in the center. Accordingly, it is considered that the dolomite deposit occurs likewise from east to west. This report describes the result of the writer's field survey in the eastern part in the neighbourhood of Kanzaki, Konjima and Iwodo.Judging from the fossils of Fusulinids, the Funafuse-Yama limestone group probably ranges from middle to upper of the lower permian system. The main genera are Pseudofusulina, Pseudodoliolina, Parafusulina, Neoschwagerina, etc., constituting the three fossil zones at the least.The strike and dip of the group can hardly be measured in many places ; but the general trend of strike is N. to S. and the strata dip either to the east or to the west. The group is divided into several blocks by the faults running along the strike or across the dip, constituting a complicated geologial structure.The grade of ore from the group is higher in SiO2 content than that from Kuzuu, Tochigi Pref. Since the group contains laminae of chert and schalstein, the workable high-grade portion is rather limited, which, is worth surveying from the mining point of view with respect to it's distribution because it contains MgO over 17 % and SiO2 below 2 %. Therefore, the writer has been conducting it's distribution survey.As for the mineral itself, the writer tested the existence of clay minerals in the insoluble residue by means of X-ray diffraction and differential thermal analysis. The test disclosed that it is composed of combined quartz, illite, chlorite, etc. From this studies conducted up to now, the writer is of the opinion that the characteristics of the insoluble residue is more similar to those of the insoluble residue of mesozoic limestone than those of Chichibu palaeozoic occurring without dolomite in the Kanto mountain districts. The writer is now of the opinion that this difference in composition characterizes the basin in which the limestone and dolomite were deposited, rather than difference in age of deposition as was considered in the initial stage of this studies. Another point that strikes the writer is that the dolomite deposit is closely related with black limestone in most places. It is considered this limestone rich in organic matters indicates that it had some bearing on the expedition of dolomitization which is considered to be related with upgrading the MgO component.

著者

猪野 浩平

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.224, pp.47-50, 1990-01-01 (Released:2011-03-07)

参考文献数

6

著者

門間 英毅 神谷 貴志 堤 正幸 長谷川 安利

出版者

The Society of Inorganic Materials, Japan

雑誌

石膏と石灰 (ISSN:21854351)

巻号頁・発行日

vol.1987, no.208, pp.127-135, 1987

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種々の形態とCa/P比の水酸アパタイト (HAp) 粉末の圧粉成形性と焼結性を比較検討した。ブラッシャイト (DCPD) の加水分解によるHAp粉末の假焼後の形態は0.15-0.20μmのテトラポット形微結晶の連結凝集した, モネタイト (DCPA) の加水分解によるものはダンベル状微結晶の凝集した, それぞれ約70×100μmの板状粒子であった。沈殿HAp粉末は微細結晶の凝集した1-6μmの塊状または15-20μmの球状粒子であった。圧粉成形体の密度は〓焼温度とともに高くなるが, 焼結体の密度は〓焼温度700-900℃に, 強度は化学量Ca/P論比より若干低いCa/P比に, それぞれ極大を示した。加水分解法によるHAp粉末でも, 焼結相対密度95%以上, 曲げ強さで100-150MPaの焼結体を得ることができたが, 沈殿HApの方がより易焼結性で高強度焼結しやすかった。焼結体グレインサイズは各HApとも差はないが (約1-4μm), 気孔は沈殿HApより加水分解HApの方で多かった。