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Volume 57, Issue 675
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Tomizi SUZUKI1941 Volume 57 Issue 675 Pages 385-393
Published: July 22, 1941
Released on J-STAGE: July 13, 2011
JOURNAL FREE ACCESSAfter experimenting on various kinds of rock, the significance of hardness of rock has been established. An experiment corresponding with blasting in practice applied a kind of tester on resistance of blasting-for rocks. Accordingly, the degree of blasting so called “Blastability” has been reduced, then the “Blastability” has been investigated and discussed about actual effect of blasting in various mines.
Secondly, by measuring the velocity of explosion in various resistances and determining the limits of the power of detonators and fuses in the greatest explosion, the best condition of blasting could be found and all experiments were studied in it.
Author believes the following:
1)“Blastability”and the effect of blasting for rocks, always, must have been discussed on conclusions connecting with the condition that explosives display the greatest power.
2) Blasting in practice should be operated in such condition necessarily.View full abstractDownload PDF (3182K) -
Yosiki OGAWA1941 Volume 57 Issue 675 Pages 394-398
Published: July 22, 1941
Released on J-STAGE: July 13, 2011
JOURNAL FREE ACCESSThe rate of zinc volatilized from ores as affected by the presence of impurities hasbeen observed for the purpose of getting some insight into the behaviour of complexsulfide ores at high temperatures. Since the cases of a neutral or slightly oxidizingatmosphere were treated in the author's previous reports, the cases of more or lessreducing nature, under which the existence of zinc in the gaseous phase is made stable, has been studied in the present investigation.
Different metals mostly in the form of oxides have been mixed with pure and complexsulfide ores, heated in a stream of CO, and the residues have been analyzed todetermine the rate of zinc and lead volatilized. Among them manganese oxide exhibitsthe most marked effect upon the rate of volatilization due to the affinity of manganeseto sulfur. Lime, baryta copper oxide and iron produce similar effects to lesser degree.Coexistence of solid carbon being found to promote the action of bases, the case of limehas been taken up and the effects of calcium carbide has been ascertained. Interactionsbetween zinc and lead compounds have been studied also and. their rates ofvolatilization have been compared.View full abstractDownload PDF (1096K) -
Effect of Variables on the Cathode Polarization Voltage[in Japanese]1941 Volume 57 Issue 675 Pages 399-410
Published: July 22, 1941
Released on J-STAGE: September 13, 2011
JOURNAL FREE ACCESSCopper refining apparatus of small commercial scale was made and cathode polarizationwas determined under varying conditions, viz. temperature, circulation velocity, composition of electrolyte, addition of glue and differences of the anode and cathodewidths. By those experiments, the following results were obtained. The cathodepolarization was high in general at the top and the side of the cathode. Addition ofglue, decrease of temperature, circulation velocity, copper concentration and differencesofthe anode and cathode widths increased the cathode polarization. Under certain conditions, bismuth seems to be deposited electrolytically, especially at the upper part andthe side ends of the cathode.View full abstractDownload PDF (4618K) -
[in Japanese]1941 Volume 57 Issue 675 Pages 411-428
Published: July 22, 1941
Released on J-STAGE: July 13, 2011
JOURNAL FREE ACCESSDownload PDF (4817K) -
1941 Volume 57 Issue 675 Pages 429-435
Published: July 22, 1941
Released on J-STAGE: July 13, 2011
JOURNAL FREE ACCESSDownload PDF (1927K)
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