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Volume 38, Issue 11
Displaying 1-10 of 10 articles from this issue
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Masami Furuuchi, Chikao Kanaoka, Shinji Hara2001 Volume 38 Issue 11 Pages 770-778
Published: November 10, 2001
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWasted printed wiring boards (PWB) were pulverized by a newly developed impact mill for the recovery of valuable materials such as copper, epoxy resin and glass fibers. Influences of operating conditions such as the loaded amount of PWB, the number of impactions N were investigated in relation to the size distribution and the copper contents of pulverized PWB classified according to size and density. The effect of pretreatment of PWB was also discussed.
Mass mean diameter of particulate products decreased with N. Geometry of copper particles was flaky and their thickness was reduced with decrease in the particle size. The peak size of copper content decreased with N. The degree of copper liberation, α, increased with N and there existed a maximum value while that of resin and glass fiber is almost constant, corresponding to the agglomeration of copper and other particles. “α” had its maximum for particles of 200-300mm. The pre-compression of PWB could increase the milling efficiency because many cracks developed on the copper foil and between the copper foil and fiber reinforced resin.View full abstractDownload PDF (7810K) -
Hitoshi Takase, Akimichi Kojima2001 Volume 38 Issue 11 Pages 779-787
Published: November 10, 2001
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWet agglomeration was investigated in a suspension of particles of polar materials, soda-lime glass and calcium carbonate, and nonpolar material, polyethylene, using a nonpolar bridging liquid, dodecane. 10-2 mol/l-NaCl aqueous solution was used as a dispersion medium, and sodium oleate or dodecylamine hydrochloride was added to it as an additive surface active agent. Adsorption of surface active agent on particles of soda-lime glass and calcium carbonate at an appropriate value improved the wettability of particles to dodecane, and therefore facilitated the wet agglomeration of particles. Wettability of polyethylene particle to dodecane was good without surface active agent. When the concentration of additive surface active agent was less than 10-3 mol/l, the surface active agent did not affect the wettability of polyethylene particle to dodecane. Selective wet agglomeration was successfully performed in a suspension of multiple materials by controlling the adhesion tension of dodecane on each particle. Separation of each particle from suspension was carried out well by taking advantage of the selective wet agglomeration.View full abstractDownload PDF (2636K) -
Keijirou Terashita, Shinichi Sugimoto, Tadakazu Ohnishi, Kei Miyanami2001 Volume 38 Issue 11 Pages 788-794
Published: November 10, 2001
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the present study, we conducted basic experiments on resource recovery of rare metals, especially nickel, using thermit reaction between metal oxide in the metal plating sludge and metal aluminum in the aluminum dross. As a result, we have reached the following conclusions.
(1) We designed a process consisting of drying, calcination, griding, mixing and briquette to make the best use of thermit reaction. The results showed that the briquette excels the powder mixture in use of efficient thermit reaction.
(2) It was confirmed from DTA and calcination experiments that the initial temperature of thermit reaction between the metal plating sludge and aluminum dross was about 1500K.
(3) The purity of recovered metals was more than 90%. Metal oxide in the metal plating sludge was sufficiently reduced. Furthermore, it was pointed out that the mixing ratio of the metal plating sludge to the aluminum dross should be based on the reaction equation.View full abstractDownload PDF (2429K) -
Control of Seed Particle Circulation RateShinji Ando, Tooru Maki, Yasuo Nakagawa, Hitoshi Emi, Yoshio Otani2001 Volume 38 Issue 11 Pages 795-800
Published: November 10, 2001
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSSpouted bed with a draft tube is widely used in pharmaceutical particle coating in order to modify the release characteristics of various medicines. In our previous work, we studied the coating efficiency and the drying process of seed particles and found that the number concentration of seed particles in a draft tube, i. e., the feed rate of seed particles into a draft tube, is the most important parameter to determine the coating performance. In the present work, we independently introduced air into the granular bed in the annulus of coater (supplemental air) besides the fluidizing air, and investigated the influence of supplemental air on the feed rate of seed particles as well as the influence of other operational parameters. As a result, it was shown that the regulation of supplemental air is an effective means to control the feed rate of seed particles into the draft tube.View full abstractDownload PDF (734K) -
Haruo Shimaoka2001 Volume 38 Issue 11 Pages 801-808
Published: November 10, 2001
Released on J-STAGE: April 30, 2010
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from Silo to IT ElementYotaro Hatamura2001 Volume 38 Issue 11 Pages 809-815
Published: November 10, 2001
Released on J-STAGE: April 30, 2010
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Kenji Ishikawa2001 Volume 38 Issue 11 Pages 816-819
Published: November 10, 2001
Released on J-STAGE: April 30, 2010
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Shinichi Kato2001 Volume 38 Issue 11 Pages 820-821
Published: November 10, 2001
Released on J-STAGE: April 30, 2010
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2001 Volume 38 Issue 11 Pages 822
Published: November 10, 2001
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (154K) -
2001 Volume 38 Issue 11 Pages 824
Published: 2001
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (123K)
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