巻号一覧
1991 巻 (1991)
- 235 号 p. 484-
- 234 号 p. 271-
- 233 号 p. 216-
- 232 号 p. 146-
- 231 号 p. 75-
- 230 号 p. 3-
1991 巻, 235 号
選択された号の論文の12件中1～12を表示しています
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西野 忠, 桜井 正1991 年 1991 巻 235 号 p. 484-489
発行日: 1991/11/01
公開日: 2011/03/07
ジャーナル フリーAn aqueous suspension containing H-R (a strongly acidic ion exchange resin, H-form) is effective to dissolve some sparingly soluble inorganic salts. The titration constitutes a convenient method to drop H-R suspension in reaction vessel from a tube at a rate of one drop approximately every 6 seconds.
In this paper, an applicability of quantitative analysis of calcium compounds such as Ca (OH) 2, CaCO3 and CaSO4·2H2O, was discussed by monitoring pH and specific conductivity (κ). There are much room for further improvement, however, the titration technique developed by us appears to be useful for the empirical determination of insoluble material.抄録全体を表示PDF形式でダウンロード (680K) -
副田 孝一, 檜田 俊晴, 林 浩志, 上林 真幸1991 年 1991 巻 235 号 p. 490-497
発行日: 1991/11/01
公開日: 2011/03/07
ジャーナル フリーThe expansion of quick lime on the hydration has been observed since acient times. This property has been utilized for various practical uses, but up to now very little detailed research has been done on the expansive stress.
This report examines the influence of burning degree and retarding agent on expansive stress of quick lime. The results are as follows.
1) When using quick lime alone, even if burning degree is high, blown-out shot occurs and expansive stress cannot be obtained.
2) When adding retarding agent such as glycerin and ethanol to quick lime with 4N-HCl con-sumption below 300ml and crystal size larger than 2.5 μm, approximately 100 kgf/cm2 of expansive stress is obtained. In that case, hydration rate of quick lime is within 400cal/hr·g and elapsed time to the maximum rate is longer than 40 min.抄録全体を表示PDF形式でダウンロード (1076K) -
坂根 幸治, 和田 英男, 北村 孝雄, 鈴江 正義1991 年 1991 巻 235 号 p. 498-503
発行日: 1991/11/01
公開日: 2011/03/07
ジャーナル フリーWe studied the preparation method of acicular magnesium pyroborate (Mg2B2O5), especially in relation to the prevention of formation of agglomerates, which generally form by heating mortar-ground mixture of MgO-H3BO3-KCl.
Spray-drying of slurry, which contained reaction components and flux, gave a starting material with Mg and B in amorphous state and Mg and K almost uniformly distributed. The slurry was made by adding hot solution of H3BO3 and KCl to suspended solution of Mg (OH) 2 with 2 : 3 : 7 mole ratio of Mg : B : KCl.
Heat treatment of the spray-dried mixture at 750°C gave small acicular crystals of Mg2B2O5 less than ca. 1μm in length without by-product such as MgO and MgB4O7. The product obtained by heating the mixture at 850°C for 3hrs contained only acicular Mg2B2O5 crystals ca. 5-15μm long and ca. 0.5μm thick, and did not contain agglomerates.抄録全体を表示PDF形式でダウンロード (1718K) -
岩永 浩, 冷泉 法二, 松波 正1991 年 1991 巻 235 号 p. 504-508
発行日: 1991/11/01
公開日: 2011/03/07
ジャーナル フリーSector-like MOS·HIGE (magnesium hydroxide sulfate hydrate) with composites MgSO4·5Mg (OH) 2·3H2O were synthesized by a hydro-thermal reaction at about 200°C using MgSO4 and NaOH aqueous solutions. They are composed of many whiskers whose growth direction is parallel to the b axis. MOS·HIGE treated thermally were examined by X-ray diffraction and temperature-programmed mass spectrometer (TPMS). The results suggest that MOS·HIGE are dehydrated at both 300°C and 450°C, and are decomposed into MgSO4 and MgO above 450°C.抄録全体を表示PDF形式でダウンロード (1338K) -
1991 年 1991 巻 235 号 p. 508
発行日: 1991年
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (180K) -
橋本 和明, 弘中 赴夫, 戸田 善朝, 橋本 甲四郎, 荒井 康夫1991 年 1991 巻 235 号 p. 509-517
発行日: 1991/11/01
公開日: 2011/03/07
ジャーナル フリーThe synthetic process of some copper (II) phosphate compounds by the liquid method of CuSO4 -Na2HPO4-H2O system at 96°C were investigated. The composition of the precipitate changed with varying initial concentration ratio and stirring time.
The initial precipitate obtained by this method was Cu4 (HPO4) (PO4) 2·3H2O including sodium phosphate, however Cu3 (PO4) 2·3H2O reported by Hanawalt et al. did not produce from the above system. Further stirring of the precipitate in suspension at 96°C, the composition of the precipitate changed to Cu2 (PO4) OH in case of initial concentration ratio R (Na2HPO4/CuSO4 : molar ratio) =0.5-2.0, to 5NaCuPO4·2Na2HPO4 (Pe : 18.0%, Y : 78.0%, λd : 488.9nm, pale greenish blue) in case of more than R=3.0, respectively. 5NaCuPO4·2Na2HPO4 decomposed to α-NaCuPO4 and Na4P2O7 on heating at ca.500°C. Their morphologies of Cu2 (PO4) OH obtained by controlling synthetic conditions were spherical, pine needle-like, chestnut-like, rod-like and octahedral crystal. Cu4 (PO4) 2O obtained by heating Cu2 (PO4) OH is sufficiently applicable as inorganic pigment because of its vivid color (Pe : 33.8%, Y : 32.4%, λd : 554.9nm, brilliant yellow green).抄録全体を表示PDF形式でダウンロード (1310K) -
田中 宏一, 熊坂 徹夫, 山下 一夫, 西野 忠1991 年 1991 巻 235 号 p. 518-523
発行日: 1991/11/01
公開日: 2011/03/07
ジャーナル フリーParticle size of CaCO3 obtained from Ca (OH) 2 as a starting material, depends on the particle size distribution and specific surface area of the hydroxide.
In order to evaluate the particle characteristics of mother substance, Ca (OH) 2, reactivities with a strongly acidic ion exchangeresin (H-R) and with an oxalic acid solution were studied with comparing each other.
The results obtained are summerized as follows;
1) Change in electrical condition (κ) during dropwise addition of H-R to a Ca (OH) 2 suspension depends on Ca (OH) 2 particle size. Especially, a gradual change in K at an initial addition of H-R is related apparently to the dissolution rate of Ca (OH) 2 particle.
2) Addition of oxalic acid which is less equivalent to Ca (OH) 2 results in pH recovery owing to the dissolution of residual Ca (OH) 2 particle.
The time needed to the pH recovery is also related to the particle size of Ca (OH) 2.
3) There is significant relationship between CaCO3 and its raw material, Ca (OH) 2 in particle size.抄録全体を表示PDF形式でダウンロード (1772K) -
小棹 理子, 落合 萌1991 年 1991 巻 235 号 p. 524-530
発行日: 1991/11/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (786K) -
湊 秀雄1991 年 1991 巻 235 号 p. 531-546
発行日: 1991/11/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (2542K) -
小林 孝雄, 吉田 道夫, 今井 俊鎌, 羽藤 美徳1991 年 1991 巻 235 号 p. 547-558
発行日: 1991/11/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (1400K) -
田中 茂省1991 年 1991 巻 235 号 p. 559-562
発行日: 1991/11/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (540K) -
築坂 亮吾, 金口 年男1991 年 1991 巻 235 号 p. 563-572
発行日: 1991/11/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (2416K)
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