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Volume 39, Issue 8
Displaying 1-6 of 6 articles from this issue
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Hiroshi Nagashima, Toshifumi Ishikura2002 Volume 39 Issue 8 Pages 566-572
Published: August 10, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe effects of deaeration of low-flowability fine powders on the discharge and conveyance characteristics have been experimentally investigated using a novel screw feeder with deaeration function for powders. Four types of powders associated with cement production process are used as test powders. As a result, the discharge rates of screw feeder for all tested powders are increased with the deaeration pressure, which results from an increase in bulk density of powders by deaeration.
The conveyance performance of fine powders are examined by measuring the sliding rate of powders fed by the screw feeder on an inclined belt conveyor. The sliding rate is reduced by the deaeration at the same discharge rate of powder, suggesting that the deaeration improves the conveyance performance of fine powders.View full abstractDownload PDF (936K) -
Takehiro Dan, Mitsuru Egashira, Kyoko Saito, Junro Kyoko, Mikihiko Kob ...2002 Volume 39 Issue 8 Pages 573-579
Published: August 10, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWe have proposed the concept of “Particle assemblage”, which aimed at the fabrication of multi-functional materials. It is expected that composite particles consisting of different kinds of particles may have new functions in addition to the intrinsic ones of each particle. Therefore, we tried to fabricate a new multi-functional composite particles composed of PTC, NTC and metallic indium particles. Preparation of composite particles was conducted mainly by means of forced electrification processing. As a result, it was confirmed that the packing cell of the composite particles had a V-type resistance dependence on temperature. It was elucidated that perfect fixation of adhered particles to core particles was indispensable to the new function.View full abstractDownload PDF (2816K) -
Tetsuo Ono2002 Volume 39 Issue 8 Pages 580-586
Published: August 10, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSEvaluation of circularity of coal particles produced by a rounding method and a wet ball mill method was performed by a flow particle image analyzer, and the effect of circularity on the fluidity of CWM (Coal Water Mixture) was investigated. The rounding method employed in the present work ground off the protrusions of particles and generated fine particles. The results showed that the circularity of Bituminous coal particles produced by the rounding method was 0.97 and the CWM with Bituminous coal particle content of 70wt% had a good fluidity of the viscosity of 0.75Pa·s. The circularity of coal particles produced by the rounding method was the same as that by the wet ball mill method under the same coal particle content in CWM. The viscosity of CWM consisting of coal particles with the circularity of below 0.95 was increased by 0.15-0.2Pa·s from that with the circularity of 0.97. Therefore the fluidity of CWM is further improved by increasing the circularity to above 0.95. These results concludes that the present rounding method gives the same circularity of coal particles as that by the wet ball mill method, which in turn yields the good fluidity of CWM with the reduction in product cost.View full abstractDownload PDF (4327K) -
Jun-ichi Hamagami, Kiyoshi Kanamura2002 Volume 39 Issue 8 Pages 587-594
Published: August 10, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (11920K) -
Makoto Kitamura2002 Volume 39 Issue 8 Pages 610-611
Published: August 10, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (3825K) -
Tomoaki Hino2002 Volume 39 Issue 8 Pages 612-615
Published: August 10, 2002
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (3662K)
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