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Volume 41, Issue 487
Displaying 1-14 of 14 articles from this issue
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The Effect of the Chemical Composition on Their QualitySeiji Kondo, Hiroshi Yoshida1933 Volume 41 Issue 487 Pages 353-365
Published: July 01, 1933
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAn investigation was carried out to find the relation between the chemical composition and quality of magnesite refractories.
Magnesites produced at six important mines near Daisekkio, South Manchuria, were calcined with or without addition of silica, alumina, ferric oxide, lime, chromic oxide, nickel oxide, manganese dioxide, or cobalt oxide. Small cylinders made of each caustic magnesia were fired to cones 26, 28 and 30. They were then ground to a certain fineness, formed into cylinders with a pressure of 300kg per sq. cm and fired to cone 20.
Porosities, absorptions, bulk specific gravities, apparent specific gravities, etc. were determined.
Then softening behaviors of the cylinders under a load of 2kg per sq. cm were examined with a constant rate of heating and the effect of the chemical composition on the property is discussed.
Influences of the chemical composition upon the resistance to the slaking action of steam under a pressure of 3 atm. and the resistance to spalling were also sought.
Finally the quality of the dead-burned products of the Manchurian magnesites and that of a dead-burned breunnerite imported from Austria are compared.
General conclusions are as follows:
(1) As to the load-bearing property, an introduction of CaO, Ni2O3, Mn2O3, Co2O3, or Fe2O3 is favorable or not much injurious, while Al2O3, SiO2, and Cr2O3 are hurtful.
(2) Cr2O3 and Al2O3 increase the resistance to slaking. SiO2 and Fe2O3 are slightly favorable.
(3) Al2O3 reduces the spalling tendency. Fe2O3, SiO2, and CaO are more or less effective.
(4) Magnesite refractories as satisfactory as those imported from Austria can be made of the Manchurian magnesites.View full abstractDownload PDF (2096K) -
[in Japanese]1933 Volume 41 Issue 487 Pages 366
Published: July 01, 1933
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (153K) -
T. Yoshioka, K. Kumagae, H. Iijima1933 Volume 41 Issue 487 Pages 366a-377
Published: July 01, 1933
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe fineness of the raw mixtures from twenty four Japanese Portland cement factories were determined after Andreasen pipett method using water or alcohol and studied with microscope.
Most of the mixtures contained 60-70% of grains of the size 20-30μ and only 10-20% of grains smaller than 20μ and also 10-20% of grains larger than 30μ. The largest grains were of the order 200μ which were found to be fragments of limestone and sometimes of quartz.View full abstractDownload PDF (13652K) -
Influences of Radiation Coefficient and Atmosphere Affecting to the Heat Loss of a Rotary Kiln ShellToyofujimaru Yoshii1933 Volume 41 Issue 487 Pages 377-382
Published: July 01, 1933
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSHeat loss of the rotary kiln shell is much connected with the atmosphere and radiation coefficients of the shell and the surrounding bodies. If we want to diminish the heat loss, it is a way to increase thickness of the lining brick, with a view to lower the shell temperatures, first of all. But heat is accumulated accordingly, and the lining brick can not stand for the high temperature of the inside, and worn away one after the other.
Therefore it is a previous question whether the degree of refractoriness of the lining brick is enough or not.
Then author intended to diminish the heat loss as few as possible, by enclosing around the kiln shell and decreasing the radiation coefficients of the shell and the surroundings also.
As its consequence, though kiln shell temperatures somewhat rise resistively, heat loss can be saved by some 15% than before.View full abstractDownload PDF (1253K) -
[in Japanese]1933 Volume 41 Issue 487 Pages 382-389
Published: July 01, 1933
Released on J-STAGE: April 30, 2010
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[in Japanese]1933 Volume 41 Issue 487 Pages 389-399
Published: July 01, 1933
Released on J-STAGE: April 30, 2010
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[in Japanese]1933 Volume 41 Issue 487 Pages 399-407
Published: July 01, 1933
Released on J-STAGE: April 30, 2010
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[in Japanese]1933 Volume 41 Issue 487 Pages 407-410
Published: July 01, 1933
Released on J-STAGE: April 30, 2010
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[in Japanese]1933 Volume 41 Issue 487 Pages 410
Published: July 01, 1933
Released on J-STAGE: April 30, 2010
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1933 Volume 41 Issue 487 Pages 411-420
Published: July 01, 1933
Released on J-STAGE: April 30, 2010
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1933 Volume 41 Issue 487 Pages 420-429
Published: July 01, 1933
Released on J-STAGE: April 30, 2010
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1933 Volume 41 Issue 487 Pages 431-439
Published: July 01, 1933
Released on J-STAGE: April 30, 2010
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1933 Volume 41 Issue 487 Pages 439-446
Published: July 01, 1933
Released on J-STAGE: April 30, 2010
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1933 Volume 41 Issue 487 Pages 450
Published: 1933
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (186K)
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