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Volume 52 (1998)
- Issue 6 Pages 336-
- Issue 5 Pages 261-
- Issue 4 Pages 195-
- Issue 3 Pages 125-
- Issue 2 Pages 51-
- Issue 1 Pages 3-
Volume 52, Issue 3
Displaying 1-6 of 6 articles from this issue
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Toshikatsu SATA1998 Volume 52 Issue 3 Pages 125-137
Published: 1998
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSDownload PDF (10029K) -
Hiroshi TAKIYAMA1998 Volume 52 Issue 3 Pages 138-145
Published: 1998
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSDownload PDF (4572K) -
Shunji Gomi, Hideto SAKANE, Toshiaki HATSUSHIKA, Takashi SUZUKI, Kazuo ...1998 Volume 52 Issue 3 Pages 146-161
Published: 1998
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSSodium-form taeniolite, NaT, has very high selectivity in ion-exchange reaction for some alkaline metal ions. NaT was granulated for removing potassium ion or caesium ions from brine with ion-exchange columns in which granular NaT was packed. A mixing-agitation granulator successfully granulated NaT from powder NaT and colloidal silica of 10wt% to NaT as binder. Granulation caused few changes in its ion-exchange property. In batch reactions, the exchange reaction of granular NaT became slightly slower than those of powdered form. The reaction rates were determined by the film diffusion in the beginning of the batch reactions, and then the intraparticle diffusion determined the rates in the middle and final stages of the reactions. This translation of the rate-determining step may be because of a decrease of the intraparticle diffusion coefficient with an increase the exchange rate. Columns packed with granular NaT removed potassium and caesium ions as well as in the batch reactions. The removal properties of the columns depended on the particle size of the grain packed. Granular NaT-packed columns removed potassium and caesium ions as selectively as powder NaT did from model seawaters. The smallest grain of NaT studied was found most suitable for columns. It is indicated that granular NaT-packed columns are useful for separation of potassium and caesium ions from brine.View full abstractDownload PDF (11960K) -
(I) Fundamental Study of Determination SystemNaohito YOSHIKAWA1998 Volume 52 Issue 3 Pages 162-169
Published: 1998
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSIn Japan, salt-manufacturimg factories produce salt from brine obtained by concentrating seawater through an ion-exchange membrane electrodialyzer. Determining the composition of the brine, seawater and the desalted water is important in the operation of the electrodialyzer. The author studied a determination system in the seawater concentrating process. The result is as follows. Chloride ion concentrations in the brine can be determined by using a densitymeter. Calcium and potassium ion concentrations in the brine can be determined by using ion selective electrodes and a densitymeter. Sodium and magnesium ion concentrations in the brine can be calculated by means of determining the values of other ion concentrations. The chloride ion concentration of seawater and of the desalted water can be determined by using a conductivitymeter. From the above results, a system constructured with these sensors can determine the compositions of the brine and chloride ion concentrations in seawater and the desalted water accurately. Therefore, we think that it will control the seawater concentrating process.View full abstractDownload PDF (5410K) -
(II) Introduction of Determination System into Salt-manufacturing ProcessNaohito YOSHIKAWA, Naoyoshi NINOMIYA, Fumihiko YAMADA, Tamotsu OHTA, T ...1998 Volume 52 Issue 3 Pages 170-176
Published: 1998
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSDetermining the composition in the seawater concentrating process of salt-manufacturing factories is important in the operation of the electrodialyzer. We introduced an in-line determination system into the process of DIASALT Co. Ltd. in order to determine the composition of the brine with ion selective electrodes and a densitymeter, as well as the chloride ion concentrations of seawater and the desalted water with a conductivity meter. The result is as follows. The determined values of the composition of the brine and the chloride concentration of the seawater and the desalted water were accurate enough for practical use. Therefore, this system made the in-line determination possible. About two years has elapsed since we introduced this system, and we have seen stable automatic determination without serious trouble.View full abstractDownload PDF (4712K) -
Norio TAKAGI, Takahiro HIROTSU, Akinari SONODA, Jitsuo SAKAKIBARA, Shu ...1998 Volume 52 Issue 3 Pages 177-183
Published: 1998
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSWe examined the properties of bundle-shaped fiber adsorbent containing amidoxime groups (AO-bundle) with respect to its uranium desorption and repetitive adsorption-desorption of uranium. Uranium on AO-bundles was readily eluted by means of a column method with 1M HCl, the extent of elution reaching 75% with 4 bed volumes of the eluate at a space velocity of 1h-1. The uranium adsorptivity of the AO-bundles decreased with an increase in the treatment time of 1M HCl, due to hydrolysis of weak-basic groups. In repetitive uranium adsorption (for 14 days by means of column method)-desorption (for 5 hours by means of batch method), the uranium adsorptivity of AO-bundles gradually decreased with the repetition number; and the adsorptivity after 5 repetitions was 70% that of the original AO-bundles. The AO-bundle showed high physical stability over repetitive usage. Therefore, longer adsorption and shorter elution with acid is very effective for repetitive uranium adsorption-desorption of the AO-bundle.View full abstractDownload PDF (5098K)
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