Journal of the Mining Institute of Japan
Online ISSN : 2185-6729
Print ISSN : 0369-4194
ISSN-L : 0369-4194
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Volume 67, Issue 756
Displaying 1-6 of 6 articles from this issue
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  • On the Relation of Geological Structure and Ore-Deposit at the Numaziri-Sulphur-Mine
    Zennozyo IGARASHI
    1951 Volume 67 Issue 756 Pages 197-202
    Published: May 25, 1951
    Released on J-STAGE: July 13, 2011
    DOIhttps://doi.org/10.11508/shigentosozai1885.67.197
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    In this paper the writer states practically the relation of the geological structure and the ore-deposits based on his. practical survey, that is the typical model of Numaziri type Sulphur deposits, composed of many ore bodies.
    Mt. Numnaziri is a strato-volcans fomed with two pyroxene-andesite-lava-flows and pyrodastic rocks. These lava-flows are of seven andesite layers and kept at the original position when these lava-flows erupted. By the volcanic activity the Radial weak lines and the Tangential weak lives expanded, and accordingly the artheries and the cappillary tubes were made. These were passed through by the ore gas and ore solution, and the ore deposits were controled by the geological structure.
    The writer states this relation and supposes the developing tendency of the ore deposits.
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  • Studies on a Method of Foreseeing the Spontaneous Combustion of Coal by Detecting a Trace of Gases (1)
    Tetsuzo KITAGAWA
    1951 Volume 67 Issue 756 Pages 203-208
    Published: May 25, 1951
    Released on J-STAGE: July 13, 2011
    DOIhttps://doi.org/10.11508/shigentosozai1885.67.203
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    Detecting tubes, which were composed of glass tubes containing a certain amount of detecting gel (silica gel coated with palladium sulfate and ammonium molybdate) were used, and 0.0001% of carbon monoxide and 0.00001% of ethylene could be measured by means of those detectors. Experiments were carried out in several coal-mines on Ish kari, Hokkaido. Carbon monoxide and ethylene were detected in a few millionths of air in the closed mines which had ever been fired by spontaneous combustion. Although the spontaneous combustion of coal used to be discovered ordinarily by the peculiar odour like gasoline or the smoke in the mine-air, it may be able to, be foreseen more early by sensitive detection of a trace of those gases.
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  • On the Analysis of the Xanthate
    Shigeru YOKOSUKA
    1951 Volume 67 Issue 756 Pages 209-212
    Published: May 25, 1951
    Released on J-STAGE: July 13, 2011
    DOIhttps://doi.org/10.11508/shigentosozai1885.67.209
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    In the analysis of the Xanthate in Japan, the Horiuchi's method has been regarded as the standard method. It is a modified form of Hirschkind's HCl-titration method.
    When, however, the Horiuchi's method was standardized, the present author expressed his opposition to the Horiuchi's calculation although he agreed with him on his operation. That is because his calculation has the following illogical point in it.
    _??_
    Now in this case A-c/2=Caustic Alkali. But in case Na2CS3 exist as impurity, A-c/2=-α…(-α=Acidic)
    Thus this method proves illogical.
    The pressent author has been engaged in the analysis of the Xanthate prcduceci in Japan for more than ten years, and has ascertained that its impurities mainly consist of Na2CS3 with a slight amount of NaOH, Na2S, etc.
    Therefore the author recommends the following calculation adopted at Besshi as an analytical method for industry:-
    _??_
    Moreover, the author has proved the exactness of the above mentioned Besshi formula by carrying on experiments adding various impurities fo the pure Xanthate.
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  • On the Lead Smelting by Means of a Fused Salts Electrolysis (Supplemenary Report)
    Keizo OKAMOTO
    1951 Volume 67 Issue 756 Pages 213-218
    Published: May 25, 1951
    Released on J-STAGE: July 13, 2011
    DOIhttps://doi.org/10.11508/shigentosozai1885.67.213
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    In the previous paper, the author explained that the impurities of the are in the electrolysis of galena disolved in fused lead chloride may be classified into two groups; that is, one group is such as gangue materials or sulphides of iron and zinc which will accumulate in the melted bath and will give injurious effects for electrolysis, another group is such sulphide as silver, antimony, bismuth, arsenic and tin which will deposit with lead.
    In this paper, the author is going to discuss on the order and proportion of electrolysis of sulphides occured in the latter group. On the other hand, the author tried to compare the order of deposition and the clecoinpcsition voltages calculated from the free energy change in the formaticn of each sulphide.
    The silver contained in galena was not necessarily deposited preferentially in all cases. Tin sulphide gives injurious effects on th electrolysis as well as zinc sulphide but antimony deposits very smoothly. Therefore, it may be expected that the metallic antimony can be extracted electrolytically from its sulphide are in fused electrolyte.
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  • [title in Japanese]
    [in Japanese]
    1951 Volume 67 Issue 756 Pages 219-224
    Published: May 25, 1951
    Released on J-STAGE: July 13, 2011
    DOIhttps://doi.org/10.11508/shigentosozai1885.67.219
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  • [title in Japanese]
    1951 Volume 67 Issue 756 Pages 225-233
    Published: May 25, 1951
    Released on J-STAGE: July 13, 2011
    DOIhttps://doi.org/10.11508/shigentosozai1885.67.225
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