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Volume 25, Issue 5
Displaying 1-5 of 5 articles from this issue
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Three Parametric Adsorption Equation and its AdaptabilityAtsushi ENDO, Noboru SUZUKI, Atsushi KOMORI, Hiroshi UTSUGI1988 Volume 25 Issue 5 Pages 280-286
Published: May 10, 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe amount of micropore and monolayer absorbed on the external surface of adsorbents were obtained from the αs-plots of argon adsorption isotherms at 77K on untreated or surface-treated silica gels and activated carbons. A three-parameter adsorption equation can be used to predict the isotherms reduced by their micropore amounts throughout nearly the entire relative pressure range. The amounts of monolayer thus obtained agreed with the amounts of external monolayer obtained from their αs-plots. The three-parameter adsorption equation can also be used to predict their bulk isotherms with a reduction of the amount of micropore. The amount of monolayer thus obtained agreed with the sum of the amounts of the micropore and monolayer on the external surface of the adsorbent. The micropore of activated carbon is found to be much finer than that of silica gels, and the cross sectional area of the adsorbed adsorbate molecule in the micropore of activated carbon is also found to be smaller than that of the usual adsorbate molecule, because of the strong interaction due to the wall of the micropore.View full abstractDownload PDF (793K) -
Michitaka SUZUKI, Yoshikane MUGURUMA, Mitsuaki HIROTA, Toshio OSHIMA1988 Volume 25 Issue 5 Pages 287-291
Published: May 10, 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to quantitatively determine a particle's shape, the profile data of particle-projected figures were fed into the personal computer using the digitizer, and then the fractal dimensions of the particles were calculated by the divider method. The fractal dimensions of twenty-eight different kinds of sample particles were compared with Wadell's working sphericity and the degree of circularity (or the perimeter ratio) based on the same particle-projected figures. The results show that the fractal dimensions of samples are correlated with circularity. The fractal dimension becomes a useful means for the quantitative representation of a particle-projected shape as well as circularity.View full abstractDownload PDF (529K) -
Yoshiteru KANDA, Shunsuke TAKAHASHI, Yuji HATA, Torajiro HONMA1988 Volume 25 Issue 5 Pages 292-296
Published: May 10, 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSRoller mills have come to be actively used for the fine grinding of solids. In this paper, the compressive crushing of powder beds was carried out to study a roller mill. The effect of the applied load, the mass of feed and the particle size on the probability of crushing and on the crushing resistance were studied. The sample used was quartz. The following results were obtained:
1) When the applied load was constant, the deformation of the powder bed increased with the increase in the mass of feed and particle size.
2) The probability of crushing increased with the increase in the applied load, but the rate of increase of the probability gradually decreased.
3) The mass of the feed with a low crushing resistance was observed, and it had a certain range. This range narrowed with the decrease in the particle size.
4) The crushing resistance increased with the decrease in the particle size.View full abstractDownload PDF (529K) -
Qian-Qiu ZHAO, Shigeki YAMADA, Genji JIMBO1988 Volume 25 Issue 5 Pages 297-302
Published: May 10, 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo clarify the mechanism and characteristics of a planetary mill grinding, batch grinding experiments were carried out using several kinds of balls each with a different specific gravity and size. The motion of the grinding media in the mill was observed and analyzed by using multistroboscope photography connected to an image analyzer, and the pressure force acting on the mill wall by the grinding media was measured by using a special pressure sensor.
A surging phenomenon consisting of a pendulum-like oscillation of the grinding media in the mill is observed. It is found that the compressive-abrasive motion of the ball charge on the compressed powder layer is effective in producing very fine particles.
An optimum fractional ball filling of the mill was demonstrated by the experimental results. It was proved that optimum filling results in the maximum applied force and the greatest motion distance with the greatest oscillation frequency of the ball charge on the powder layer.
It was also found that the smaller the size of grinding ball, the finer the ground product that can be obtained. The ratio of the largest remaining particle size to the ball size is about 3×10-3.View full abstractDownload PDF (612K) -
Kanji MATSUMOTO1988 Volume 25 Issue 5 Pages 303-309
Published: May 10, 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (883K)
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