Journal of the Society of Powder Technology, Japan

[title in Japanese]

Masunori Sugimoto

2001 Volume 38 Issue 9 Pages 599
Published: September 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.599

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Effect of Surface-treatment Additive on Particle Characteristics and Catalytic Activity of Molybdenum Sulfide Prepared by Wet Comminution

Kunio Uchida, Yasunori Kuriki, Kazuo Shimada, Kunio Kamiya, Hiroshi Ha ...

2001 Volume 38 Issue 9 Pages 600-606
Published: September 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.600

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We investigated the effect of oleic acid as an additive on particle characteristics and catalytic activities of molybdenum sulfide prepared by a wet comminution in n-decane for 10 hours. A mediaagitating mill was used in the wet comminution. The amount of oleic acid added to molybdenum sulfide in n-decane varied from 0 to 1.6mmol/g. Size distribution of molybdenum sulfide particles, BET specific surface by nitrogen gas physical adsorption (SN₂), specific surface area by hydrogen gas chemical adsorption (SH₂), chemical composition, and FT-IR diffuse reflectance spectra were measured. Hydrogenation (HY) of 1-methylnaphthalene (1-MN) and hydrodesulfurization (HDS) of dibenzothiophene (DBT) were evaluated as model reactions of catalytic activity.
Median diameter of molybdenum sulfide particles prepared by the wet comminution decreased with increasing oleic acid except in the case of 1.6mmol/g, being smaller than 100nm in all cases. Both BET specific surface area (SN₂) and the specific surface area from H₂ chemical adsorption (SH₂) decreased with increasing oleic acid, and the ratio, SH₂/SN₂, was about 0.1 in all the comminution conditions. The diffuse reflectance spectra showed that oleic acid was physically adsorbed on molybdenum sulfide. Hydrogenation (HY) of 1-MN and hydrodesulfurization (HDS) of DBT also decreased with increasing oleic acid, showing a negative correlation between the catalytic activity and the amount of oleic acid added in n-decane.

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Improved Coal Pulverization Using Embrittlement due to Cracks Generated in Pores of Coal

Tetsuo Ono

2001 Volume 38 Issue 9 Pages 607-611
Published: September 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.607

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Pulverized coals produced by a rounding method have a wide range of particle sizes. Even though the coals have the same Hardgrove Grindability Index (HGI), some coals are difficult to pulverize by the rounding method. There are many pores in the coal. When pore pressure is rapidly reduced, cracks are generated in the pores by the expansion of air and the coal becomes brittle. The purpose of the present work is to investigate the performance of coal pulverization by an improved rounding method specifically by the embrittlement of coal due to the cracks generated in the pores. The experimental results show that pulverized coals for CWM which have a wide range of particle sizes can be easily produced by the improved rounding method. Furthermore, a discharge pressure at the embrittlement treatment can control the particle size of pulverized coals.

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Dispersing Abilities of New Microbial Dispersants and Their Derivatives

Takashi Yoshiyasu, Toshihito Kakiuchi, Tetsuo Yamashita, Kunio Furusaw ...

2001 Volume 38 Issue 9 Pages 612-616
Published: September 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.612

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New microbial dispersants, CF2399 and CF2403, were discovered in a culture broth of fungi. In this study, we examined the adsorption of CF2399 and CF2403 to Titanium oxide (TiO₂) particles, and synthesized the derivatives of CF2399 and evaluated them as a dispersant using the Copper (II) phthalocyanine pigment. Several examinations showed that the adsorption of CF2403 onto the particles is stronger than CF2399. Through the adsorption isotherm of CF2403 onto the inorganic pigment, we inferred that CF2403 has two adsorption systems of single-or double-layer due to their existent rates. The hydrophobic derivatives of CF2399 have higher activity of dispersion to the organic pigment than CF2399. We ascertained that the addition of hydrophobic group caused an increase in the adsorption rate to the hydrophobic pigment.

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Particle Discharge Characteristics from a Nozzle of Thin Tube Immersed in Liquid Subject to Ultrasonic Wave Force

Kenichi Yamamoto, Mitsue Shiokari, Toshiaki Miyajima, Masateru Kawamur ...

2001 Volume 38 Issue 9 Pages 617-625
Published: September 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.617

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A wet micro-feeder that utilized ultrasonic wave force was designed and constructed to feed small particles into a container of wet particulate materials. The particle discharge characteristics from a nozzle with the inside diameter, D_n, were experimentally investigated using spherical and irregular particles of 80 to 180μm in diameter, d_p. As a result, the critical ratio for particle blockage of present feeder, (D_n/d_p)_c≈3.0, was smaller than the values obtained previously (>4-5) in the gravitational field for dry powders. The present feeder could achieve stable and continuous discharge of small amount of particles. Multiple regression analysis proved that the discharge rate of particles, i. e. the number of particles discharged from a nozzle per unit time, N, depended on D_n, d_p, the applied voltage V₀, and the median value of particle shape index (surface roughness), φ₅₀, and that N was proportional to D^2.29_n. Therefore, N could be controlled by V₀ and D_n for given particles.

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Particle Classification with Improved Hydro-cyclone Separator

Hideto Yoshida, Satoshi Akiyama, Kunihiro Fukui, Akira Kumagaya

2001 Volume 38 Issue 9 Pages 626-632
Published: September 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.626

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Classification performance of hydro-cyclone with adjustable guide plate as well as blow-up and blow-down method has been investigated both experimentally and theoretically. The cyclone has the adjustable inlet guide plate at the inlet, and 50% cut size is controlled from 8.8 to 12.4μm by changing the inlet width ratio of the guide plate from 0.1 to 1. The 50% cut size is successfully controlled from 18.6 to 40μm by the use of guide plate, along with blow-up and blow-down method. In the case of constant liquid flow rate condition, the 50% cut size is reduced by decreasing the inlet width ratio of the guide plate. The experimental results qualitatively agreed with the numerical calculation results based on the direct simulation method. In the case of small inlet width ratio under constant liquid flow rate, the 50% cut size is decreased because the tangential and axial fluid velocity near conical wall increase and a part of fluid entering the dust box rapidly changes its direction to side wall of the dust box.

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Development of Ceramic Shaping Device with Electrophoretic Deposition Method

Eiji Usuki, Nobuyoshi Asai, Kiichi Oda, Suguru Suzuki

2001 Volume 38 Issue 9 Pages 633-636
Published: September 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.633

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A new shape-forming device with electrophoretic deposition method was developed for both traditional ceramics and fine ceramics. The formation was carried out by the combination of capillary suction force through a gypsum mold and electrophoretic deposition. The combination allowed the control of thickness at any part of cast bodies. The device can form sanitary ware products with uniform thickness. Furthermore, in the field of fine ceramics, ceramic pipes with a diameter less than 0.5mm are fabricated by the present device with carbon electrode. In shaping a thin ceramic sheet a stainless steel-electrode covered with semi-permeable film was used. By means above systems, inner holes produced by the generation of oxygen in shaped products were minimized.

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Preparation of Metal Oxide Precursor Solution by New Process

Application of Surface Coating to Photocatalyst

Seichi Rengakujia, Yuuko Nakamura

2001 Volume 38 Issue 9 Pages 637-641
Published: September 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.637

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My Old Powder Chenuistry Labo

Masafumi Arakawa

2001 Volume 38 Issue 9 Pages 642-651
Published: September 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.642

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Coal Utilization and Dust Collection Technology (Part 2)

High Temperature Dust Collection Technology on New Type High Efficiency Power Generation

Hisao Makino

2001 Volume 38 Issue 9 Pages 652-658
Published: September 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.652

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[title in Japanese]

[in Japanese]

2001 Volume 38 Issue 9 Pages 659
Published: September 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.659

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