Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 42, Issue 3
Displaying 1-14 of 14 articles from this issue
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  • [title in Japanese]
    Fumio Saito
    2005 Volume 42 Issue 3 Pages 169
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.169
    JOURNAL FREE ACCESS
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  • Fundamental Study for Comparison of Dry and Wet Grinding Using Bending Tests of Glass
    Yoshiteru Kanda
    2005 Volume 42 Issue 3 Pages 170-177
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.170
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    Fine powders are prepared by dry or wet grinding process, and there are many mechanical properties which have direct effects upon the grindability of solids, e. g., breaking properties are related to the grindability and the breaking strength is affected by the grinding atmospheres. In this work, ball mill grinding and bending test were carried out using glass material in order to investigate the difference between dry and wet grinding. It was found that the wet strength of glass is less than the dry one, and that the crack length in water is larger than that in air. Therefore a wet grinding process is preferable for grinding powders with a high strength.
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  • Effect and Behavior of Liquid Additive Molecules in Dry Ultrafine Grinding of Limestone
    Masahiro Hasegawa, Mitsumasa Kimata, Masakazu Yaguchi
    2005 Volume 42 Issue 3 Pages 178-184
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.178
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    The effect of liquid additives such as alcohol and glycol on the ultrafine grinding of limestone was investigated by using a vibration rod mill. Liquid additives used in the present work were three alcohols and two glycols with different alkyl groups. The experiments were carried out by a batch operation, and the change in specific surface area of limestone with grinding time was measured by BET adsorption method. The behavior of methanol molecules added as a additive was traced by monitoring the temperature and pressure in the grinding pot during grinding. The results showed that the alcohols and glycols promote ultrafine grinding of limestone, and that the maximum specific surface area of limestone obtained with additives is proportional to the amount of additive. The stepwise addition of a small amount of additive was more effective rather than adding the whole amount at once in increasing the grinding rate of limestone. It was also found that the degradation of crystal structure of limestone was controlled by the addition of alcohol. The grinding status of limestone could be traced by monitoring the temperature in the grinding pot, and the measurement of pressure change in the grinding pot revealed that the additive molecules are chemisorbed on the fresh surface of limestone created by the grinding.
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  • Characteristics and Hydrogen Desorption Property of Nanostructured Graphite Produced by Grinding in Vacuum Atmospheres
    Minoru Shirahige, Junichi Iida, Toshiyuki Fujimoto, Yoshikazu Kuga, Mi ...
    2005 Volume 42 Issue 3 Pages 185-191
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.185
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    The natural graphite ground in vacuum atmosphere by a vibration ball mill is found to have porous nanostructure consisting of the agglomeration of primary particles of approximately 20nm in size. Such nanostructured graphite particles were used as a raw material to investigate the hydrogen desorption characteristics of the products ground in high pressure hydrogen atmospheres by 3 types of milling machines including a ball mill, a vibration ball mill and a planetary ball mill. We experimentally investigated the relationship between the nanostructures and the hydrogen desorption temperature from the products obtained by the grinding of the nanostructured graphite in hydrogen atmosphere. The micropores and mesopores in the nanostructured graphite prepared by a vibration ball milling in vacuum atmosphere almost remained during the further grinding by the ball milling in hydrogen atmosphere. The temperature at which hydrogen started to desorb from the ground products of the nanostrucutured graphite prepared by a vibration ball mill in vacuum atmosphere decreased to 470K from 600K, as reported previously.
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  • Structural Control of Selenium Compounds by a Planetary Ball Mill
    Yoshiyuki Shirakawa, Hiroto Otsuki, Takuma Matsuda, Hiroshi Mio, Atsuk ...
    2005 Volume 42 Issue 3 Pages 192-198
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.192
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    Structural changes of germanium-selenium mixtures in a milling process have been investigated for controlling their structures. During the milling of Ge-GeSe eutectic powder samples, only the crystalline GeSe selectively changes into the amorphous, whereas Ge powder remained in the crystalline structure. Ge acted as a grinding aid for GeSe amorphisation because the amorphisation rate of GeSe in Ge-GeSe mixtures was faster than that of pure GeSe. GeSe-GeSe2 and GeSe2-Se mixtures with any mixing fraction can be amorphised. The amorphous structures analysed by pair distribution functions derived from Fourier transformation of correlation functions, and the nearest neighbor distances of atoms were estimated for these mixtures. First and second nearest neighbor distances indicated that there were tetrahedral units of GeSe4 in the ground GeSe-GeSe2 amorphous. In the GeSe2-GeSe, the tetrahedral network of GeSe4 and helical chain structures of Se were mixed in their amorphous state. The amorphous structures of the mixtures were reconstructed by continuing the milling after Bragg peaks vanishing. It indicates that these unit structures and interunit interaction in amorphous states of the mixtures, which shows phase separation in their crystal state, were changed by milling under the present condition. Blending and alloying of the Se polymer and GeSe2 network structure were progressing in this milling process.
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  • Mechanochemical Redox Process for the Synthesis of Fine Magnetite Powders
    Osami Abe, Masafumi Koike, Reiko Umezawa
    2005 Volume 42 Issue 3 Pages 199-205
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.199
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    Direct mechanochemical synthesis of γ-Fe3O4 powders with a planetary-mill from metallic-Fe and FeO(OH)(1:2) in H2O2-containing acetone is proposed. At the initial stage of grinding, FeO(OH) particles are kneaded into deformable metallic-Fe forming composite particles. When the metallic-Fe is oxidized to FeO by H2O2, the FeO immediately reacts with FeO(OH) to form γ-Fe3O4. Almost singlephase γ-Fe3O4 is obtained by the grinding at 5s-1 for 5.0h. The heat of oxidation of iron promotes the formation of γ-Fe3O4. The γ-Fe3O4 particles are dispersed into the grinding liquid without adhesion to the grinding media. The small amounts of residual Fe and FeO(OH) further react under heat-treatment at 300°C in Ar. The primary particle size of the synthesized γ-Fe3O4 is 13-17nm. α-Fe2O3 does not form when excess amounts of H2O2 are added (H2O2/Fe=3.17). Although H2O as a substitute of H2O2 produces γ-Fe3O4, the addition of small amounts of oxidation reagents effectively promote the synthesis reactions.
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  • Decomposition of Chlorinated Organic Compounds by Mechanochemical Methods
    Yasumitsu Tanaka, Qiwu Zhang, Fumio Saito
    2005 Volume 42 Issue 3 Pages 206-212
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.206
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    Chlorinated organic chemicals such as 1, 2, 3-trichlorobenzene (TCB), monochlorobiphenyl (BPCl), and magnetic recording tape were subjected to grinding with and without an additive to decompose their structures mechanochemically. The additive was CaO, and the mill used in the experiment was a planetary mill. After the grinding, a washing operation using water was conducted to separate the soluble compound from the product by filtration. The ground product and the filtrate were characterized by ion chromatography (IC), gas chromatography (GC/MS), X-ray diffraction (XRD), Raman spectroscopy, electron spin resonance (ESR) and inductivity coupled plasma (ICP). The conversion of the chlorinated organic chemicals was almost 100% by prolonged grinding, where radicals played a significant role in the decomposition and the yield of the ground samples. This operation would be applicable to the decomposion of other chlorinated organic substances.
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  • [title in Japanese]
    Mitsuhiro Ito
    2005 Volume 42 Issue 3 Pages 213-216
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.213
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  • [title in Japanese]
    [in Japanese]
    2005 Volume 42 Issue 3 Pages 217
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.217
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  • [title in Japanese]
    [in Japanese]
    2005 Volume 42 Issue 3 Pages 217a-218
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.217a
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  • [title in Japanese]
    [in Japanese]
    2005 Volume 42 Issue 3 Pages 218
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.218
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    2005 Volume 42 Issue 3 Pages 219
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.219
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    2005 Volume 42 Issue 3 Pages 220-221
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.220
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Ko Higashitani
    2005 Volume 42 Issue 3 Pages 222-224
    Published: March 10, 2005
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.42.222
    JOURNAL FREE ACCESS
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