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Volume 1983 (1983)
- Issue 187 Pages 289-
- Issue 186 Pages 223-
- Issue 185 Pages 168-
- Issue 184 Pages 111-
- Issue 183 Pages 59-
- Issue 182 Pages 3-
Predecessor
Volume 1983, Issue 187
Displaying 1-14 of 14 articles from this issue
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Yasuo ARAI1983 Volume 1983 Issue 187 Pages 289-300
Published: November 01, 1983
Released on J-STAGE: March 07, 2011
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Masaru GOTO1983 Volume 1983 Issue 187 Pages 300-306
Published: November 01, 1983
Released on J-STAGE: March 07, 2011
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Kisaku FURUYA1983 Volume 1983 Issue 187 Pages 307-309
Published: November 01, 1983
Released on J-STAGE: March 07, 2011
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Junichi KASAI, Osamu MACHINAGA1983 Volume 1983 Issue 187 Pages 309-311
Published: November 01, 1983
Released on J-STAGE: March 07, 2011
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Mitsuo HANADA1983 Volume 1983 Issue 187 Pages 311-315
Published: November 01, 1983
Released on J-STAGE: March 07, 2011
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Masaki DAIMON, Keiichi MINEGISHI1983 Volume 1983 Issue 187 Pages 315-318
Published: November 01, 1983
Released on J-STAGE: March 07, 2011
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Takafumi KANAZAWA1983 Volume 1983 Issue 187 Pages 318-321
Published: November 01, 1983
Released on J-STAGE: March 07, 2011
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Yoshio KASAI1983 Volume 1983 Issue 187 Pages 322-325
Published: November 01, 1983
Released on J-STAGE: March 07, 2011
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Birth and Utilization of DesulphogypsumNorihiro KUDO1983 Volume 1983 Issue 187 Pages 325-332
Published: November 01, 1983
Released on J-STAGE: March 07, 2011
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Shigeo MIYATA1983 Volume 1983 Issue 187 Pages 333-339
Published: November 01, 1983
Released on J-STAGE: March 07, 2011
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Seiichi MATSUNO, Makoto TAKAHASHI, Jumpei ANDO1983 Volume 1983 Issue 187 Pages 341-347
Published: November 01, 1983
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESSAs one of basic studies of removal of phosphorus from waste-water, formation and change of calcium phosphates in aqueous solution were investigated. Calcium chloride solutions with different amounts of sodium hydroxide were added rapidly to phosphoric acid solution (total 500 ml, P2O5=2, 000 mg/L, CaO/P2O5 mole ratio 3. 33) at 25°C and the products were aged for 15 minutes to 1 day. Precipitates and filtrates were tested by X-ray and chemical analysis. Main constituents in the precipitates were dicalcium phosphate at pH 5.5, octacalcium phosphate at pH 5.5-6.0, and hydroxyapatite (HAp) 6.0-7.5. The phosphate content of the filtrate decreased with rising pH. The precipitates above pH 7.5 consisted of HAp with poor crystallinity or amorphous calcium phosphate (ACP) which apparently was more soluble than HAp … the plots of P2O5 vs. pH thus discontinued around pH 7.5.
The precipitates first formed at pH 6. 0-7.5 were mainly HAp with very poor crystallinity or ACP which changed into HAp in 5-30 minutes resulting in pH lowering. The precipitates at pH 6-9 in 30 minutes aging had the CaO/P2O5 mole ratio of 2.7-3.0, which increased to 2.9-3.1 for 1 day.
The filterability of the precipitates was closely related to the types of compounds. The effects of Na+ and NH4+ were examined as well as of the different mixing methods of the solutions.View full abstractDownload PDF (897K) -
Shigeki AOKI, Yasuo ARAI1983 Volume 1983 Issue 187 Pages 348-352
Published: November 01, 1983
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Satoshi TAKAHASHI, Katsumi SETOYAMA1983 Volume 1983 Issue 187 Pages 353-356
Published: November 01, 1983
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESSEight kinds of chemical gypsum and one natural gypsum from Morocco as a control were used in this experiments. The hemihydrate was prepared by calcining these gypsum samples in an oven at 130°C for 16 hours and then ageing for 48 hours in 60% r. h. at 20°C.
Each hemihydrate had the particular physical properties of its own such as water demand, setting time and strength after setting and also had different particle disintegration characteristics. The signigcant corelation between the physical properties and the particle disintegration of these hemihydrate was not found. It was considered that physical properties of these hemihydrate depended more upon the original chatacters of chemical gypsum such as chemical compositions, pH and crystalinity etc. than upon disintegration properties of hemihydrate particles.View full abstractDownload PDF (1142K) -
Infrared Absorption Spectroscopy (1)[in Japanese], [in Japanese]1983 Volume 1983 Issue 187 Pages 357-366
Published: November 01, 1983
Released on J-STAGE: March 07, 2011
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