FLOTATION

Fracture behaviors of polyment and GFRP

Norio NARAZAKI, Takahide WAKAMATU

1983 Volume 30 Issue 4 Pages 157-164
Published: December 28, 1983
Released on J-STAGE: June 05, 2009

DOIhttps://doi.org/10.4144/rpsj1954.30.157

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The size reduction of waste polymers and composite materials has become an important subject in the field of waste reclamation. And these energy consumption by size reduction of waste polymer and composites as GFRP (Glass Fibre Reinforced Plastics) are very large for the reason of their high strength and plastical properties.
Therefore this investigation has been carried out as a part of assuring energy saving on pulverizing. Then, in this investigation, stress (load)-strain (displacement) curves on the 4 kinds of fracture process (tensile, compressive, flexural and shearing) are measured 4 kinds of resins and GFRP, and next fracture surface energies in individual cases are calculated from their curves and compared them.
The results obtained are as follows
(1) Fracture surface energy on shearing load is least in 4 kinds of load.
(2) Fracture energy of GFRP are exceedingly large, it is owning to reinforcement of glass fibre and interlaminer delamination.

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Influence of Particle Size on Coal Flolation

A Study on Coal Flotation (1st Report)

Toshiaki MURATA, Shinzo OKADA

1983 Volume 30 Issue 4 Pages 165-171
Published: December 28, 1983
Released on J-STAGE: June 05, 2009

DOIhttps://doi.org/10.4144/rpsj1954.30.165

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It has been said that the flotation rate of coal is favourable within the size range of 48-150 mesh. In the case of both sizes of over 20mesh and under -325 mesh, however, the flotation operation is very difficult on account of the decrease of flotation rate.
In the present paper, a series of flotation tests was done by useing fraction of different sizes. The experimental samples was prepared by the clean coal and refuse from the baum jig in Yubari-Shinko washing plant.
As can be seen in Fig. 2, the flotation yield was the best within the size range of 35-100 mesh. On the other hand, it decreased with the decrease of particle size. Especially, the flotation yield of -325 mesh fraction was very poor. In the case of over 20 mesh fraction, it was 51.1-63.7%. these results was rather better than fine particle fractions. If the addition of flotation oil and the flotation time are increased, the flotation yield will increase even if paricle size is larger than over 20 mesh.
The flotation yield of refuse increased with the decrease of particle size. The yield of under 325 mesh was 16.9%.

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Trends on the Automation of Coal Preparation Plants at United Kingdom and Federal Repulic of Germany

Hiroshi KAWAGUCHI, Jiroh ONODERA

1983 Volume 30 Issue 4 Pages 172-181
Published: December 28, 1983
Released on J-STAGE: June 05, 2009

DOIhttps://doi.org/10.4144/rpsj1954.30.172

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Chemical Characterization of Coal Petrographic Component obtained by Specific Gravity Method

Toshio KOIKE, Yoshihisa SAKURAI, Mitsuhiro SAKAWA, Teruo MATSUO, Yasut ...

1983 Volume 30 Issue 4 Pages 182-189
Published: December 28, 1983
Released on J-STAGE: June 05, 2009

DOIhttps://doi.org/10.4144/rpsj1954.30.182

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COAL PREPARATION AT WEST CLIFF COLLIERY

R.J. Fraser, B.A. Tobin

1983 Volume 30 Issue 4 Pages 190-208
Published: December 28, 1983
Released on J-STAGE: June 05, 2009

DOIhttps://doi.org/10.4144/rpsj1954.30.190

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Pollution Control Technology, Present and Future

Toru ISHIHARA

1983 Volume 30 Issue 4 Pages 209-215
Published: December 28, 1983
Released on J-STAGE: June 05, 2009

DOIhttps://doi.org/10.4144/rpsj1954.30.209

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A Report from the Several Recent Symposia and Congresses Overseas

Toshio INOUE

1983 Volume 30 Issue 4 Pages 216-223
Published: December 28, 1983
Released on J-STAGE: June 05, 2009

DOIhttps://doi.org/10.4144/rpsj1954.30.216

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