Journal of the Fuel Society of Japan
Online ISSN : 2185-226X
Print ISSN : 0369-3775
ISSN-L : 0369-3775
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Volume 30, Issue 11-12
Displaying 1-19 of 19 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1951 Volume 30 Issue 11-12 Pages 295
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.295
    JOURNAL FREE ACCESS
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  • Recent Coal Preparation in Japan and U.S.A.
    Lecture at the Special Meeting on Coal Preparation of the Fuel Society of Japan on May 12, 1951
    Charles C.Boley
    1951 Volume 30 Issue 11-12 Pages 296-304
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.296
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    [in Japanese]
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  • Some Experiments on the Floatation of Coal
    Hiroshi Fushimi
    1951 Volume 30 Issue 11-12 Pages 304-310
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.304
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    Using kerosene, crude tar and its fractions as reagents, the author carried out floatation of some coals and examined the influence of the addition of reagents upon the wettability of coals.The results were summarized as follows: -Tagawa and Heiwa coals were relatively high in the yield of cleaned coal, whilst Oani and Nakoso low.The yield increased with the decrease of ash content of raw coal, but the rate of de-ashing decrased.As the reagents, cresol, creosote oil and kerosene were suitable and the degree of de-ashing could be estimated by two curves which were obtained by changing the amount of addition of reagent.The wettability of coal was increased by both the addition of reagent and the elevation of temperature, as shown by the decrease of contact-angle, and also it was relatively proportional to ash content.Theteepol had superior effect in lowering contact-angle, as compared with the Rikaren, therefore it was considered to be more suitable as dustrestrainer.Besides above, it was recognized that the velodity of electrophoresis of coal was inversely proportional to ash content in the case of Sakito coal.
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  • A Method of Recovering a high quality Coal from Hokkaido Slime
    Shintar Matsuzawa
    1951 Volume 30 Issue 11-12 Pages 310-324
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.310
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    Because of a large amount of ash content, some slimes of HokkaidO coals are not available for coke manufacturing.
    The authors tried to recover an adequate clean coal from the slimes, and after several experiments, the authors.succeeded to carry out in practice.
    By the medium scale laboratory apparatus, it was found that the yield of the cle-an coal from Yilbari slime was 76%, that from sunagawa slime was 57% and that from Mojiri was 38%, the ash content of the clean coals being about 12%.
    It can be said that Yiibri and Sunagawa slimes are available from the economical point of view.Therefore, the author have installed and operated a slime washer on extensive scale, and in the case of Yiibari No.2 slime used as raw material in this washer, the yield was 75% at 11-12% of ash content.
    By the way, research on the utilization of slurry produced in slime washing was carried out and the authors could get a good result in the medium scale experiment by their, own froth floatation apparatus: The yield was over 75% at 12% of ash.And more, from the, refuse produced in washing, it was found to he possible to get a: certain amount of good coal.
    In conclusion, the authors' opinion is as follows: -In the case of Yilbari No.2 slime it is possible to recover clean coal of the ash of 12% at the yield of 82% or more.
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  • The Capacity of Baum-Type Jig regarded from the Motion of Particles in Wash-Box
    Etiroe Ushio
    1951 Volume 30 Issue 11-12 Pages 324-331
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.324
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    In the first series of experiments in this study, the motion of specim-en particles in Baum-type jig under operation was examined in relation to specific gravity, shape and size.The author acertained that the seperation of particles was carried out following the jiging-principle based on the known equation dv/dt=g (s-1/s) i.e.the seperation was carried out principally according to their specific gravity, but was independent of their shape and size.
    Acording to the above mentioned result, the author made clear how to design and control the Baum-type jig to adapt to the grade of row coal and how to calculate the capacity of jig with the mean velocity of particles obtained from preliminary sink-and- float test.
    In the second series of experiments, size and ash distribution of coal in the various section of wash box were examined.The author explained the state of stratification of coal and gave some considerations on the mechanism of wash-box.
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  • On the Water used for Coal Washing
    Shiro Okistu
    1951 Volume 30 Issue 11-12 Pages 332-341
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.332
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    The author has investigated on the water used for coal washing in practice and calculated the quantity of water from the factors in washery, that is the quantity of feed coal, percentage of extreme fines, number of times of washing, recovery percentage of extreme fines, quantity of supply-uater and concentration of washing water.
    The authors threw the eight on the problem of dity water from the above-mentioned calculation which are substantiated in practice.
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  • Test of Cyclone-Thickner and its Practice in a Pilot-Plant of the Asö Mineral Industry Co.
    T. Asö
    1951 Volume 30 Issue 11-12 Pages 341-355
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.341
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    In the fist the tests were carried out with five types of cyclone and their seperating efficiencies were examined respectively.
    Effects of factors entering into the operation of cyclone such as the inlet pressure, diameters of the inlet and underflow nozzles, cyclone capacity, angle of the cone, pr-esense of spacer, feed concentration, density of feed particle and junction of parts etc., were examined.In the second port practical tests of cyclone at a pilot plant of the Takeshita Mine based on the above-mentioned factors were carried out and it was co-ncluded that the wet-cyclone is effective not only for feed thickning, but also for de-sliming or drying of the flotation products.
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  • A Rapid Method for the Determination of Sulphur in Coal and Coke
    Shuichi Horikawa, Takeshi Sato
    1951 Volume 30 Issue 11-12 Pages 355-361
    Published: December 30, 1951
    Released on J-STAGE: October 21, 2011
    DOIhttps://doi.org/10.3775/jie.30.355
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    Beet and Belcher's rapid method for determining sulpur in coal and coke was applied to several Japanese Coals.It was found that simplicity of procedures, remarkable saving of time for operation and easy computation of the results could 136 acquired, and also verified that the accuracy of the determination was epual to that of Eschka method.
    When the same method was applied to the determination of sulphur in coal ash or of non-combustible sulphur, the operation could be made more rapidly and easily than that of Eschka method.
    By comparing the analytical results obtained by both;methods, it was pointed out that the rapid method could be employed in place of the method of sulphur.detenn-ination defined in JES.
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  • On the Formation fo Coal
    Wataru Funasaka, Chikao Yokogawa
    1951 Volume 30 Issue 11-12 Pages 362-371
    Published: December 30, 1951
    Released on J-STAGE: February 23, 2011
    DOIhttps://doi.org/10.3775/jie.30.362
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    The various theories, in regard to the formation of coal, i.e.H.Potoniés theory, F.Fischers' lignin origin theory, F.Bergius' and R.V.Wheelers' cellulose orign theory, J.Marcussons oxycellulose orign theory, etc., were introduced, and the important ones of these theories were explained in detail.The artificial coa-lification Method, which were commenced by BergiUs and on which his cellulose origin theory was based, was also explained in detail.
    Then the authors coalified cellulose, lignin, fatty acids, oxycarbonic acids, alco-hols, phenols, aromatic acids, carbohydrates, phenol resins, etc.in neutral, acidic and basic water medium artificially.The elementary and technical analysis, extrac-tion tests and carbonisation tests in crucible of the products were carried out From the experimental results the authers concluded that both cellulose and lignin were concerned with the formation of coal, the caking component of coal was derived from cellulose and the moderate remaining of the decomposition products of cellulose and coalification grade were necessary to the formation of strong coaking coal.
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  • [title in Japanese]
    1951 Volume 30 Issue 11-12 Pages 372-373
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.372
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  • [title in Japanese]
    1951 Volume 30 Issue 11-12 Pages 374
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.374
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  • [title in Japanese]
    1951 Volume 30 Issue 11-12 Pages 374a-376
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.374a
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  • [title in Japanese]
    1951 Volume 30 Issue 11-12 Pages 376-378
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.376
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  • [title in Japanese]
    1951 Volume 30 Issue 11-12 Pages 378-379
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.378
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1951 Volume 30 Issue 11-12 Pages 379
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.379
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  • [title in Japanese]
    1951 Volume 30 Issue 11-12 Pages 379a-380
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.379a
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1951 Volume 30 Issue 11-12 Pages 381-383
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.381
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  • [title in Japanese]
    1951 Volume 30 Issue 11-12 Pages 383-385
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.383
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1951 Volume 30 Issue 11-12 Pages 385-386
    Published: December 30, 1951
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3775/jie.30.385
    JOURNAL FREE ACCESS
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