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Volume 67, Issue 754
Displaying 1-6 of 6 articles from this issue
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Relation between change of the chemical composition and some physical, floatable propertiesKitarô HAYASE, Taneomi HARADA1951 Volume 67 Issue 754 Pages 94-101
Published: March 25, 1951
Released on J-STAGE: July 13, 2011
JOURNAL FREE ACCESSWe are studying the properties of Pyrrhotite, and in this report it is especially dealt with the relation between change of the chemical composition and some physical, floatable properties of Pyrrhotite from Kawayama Mine, Yamaguchi prefecture.
The main results obtained are as follows.
(I) Some physical and floatable properties of Pyrrhotite vary with change of its chemical composition, and show the limited values at about 52.8 atomic percent sulphur; that is to say, the magnetism (Fig.4) and the friability the maximum, the floatability (Fig.5) and the specific gravity (Fig.7) the minimum.
These mean;
(II) The range from 50.0 to 52.8 a.tomic percent sulphur has the simple phase.
(III) The range more than 52.8 atomic percent sulphur is the mixture., of Pyrrhotite and Pyrite or Marcasite.View full abstractDownload PDF (3928K) -
Jitaro YONEZAWA, Masao TANAKA1951 Volume 67 Issue 754 Pages 102-107
Published: March 25, 1951
Released on J-STAGE: July 13, 2011
JOURNAL FREE ACCESSThis paper gives the reports on spontaneous combustion of Joban Coal Seam. First, we studied the relation between spontaneous combustion and the heat of earth, and measure the ignition temperature and the thermal conductivity. As the results of this experiments, we obtairtecl following conclutions.
(1) The heat of earth have influence much on the spontaneeous combustion unclerground.
(2) The ignition temperature is not so much low, comparing with other coal.
(3) The heat of earth have no influence on the thermal conductivity, and the porosity of coal seam have influence on the thermal conductivity.
(4) After all, the nature of Joban coal are not liable to spontaneous combustion, and we think other factors ie. Ventilation, size of pillar, mining method, earth pressure, have influende on the spontaneous combustion under ground.View full abstractDownload PDF (1132K) -
Tadashi OYAMA, Saburo YASHIMA1951 Volume 67 Issue 754 Pages 108-115
Published: March 25, 1951
Released on J-STAGE: July 13, 2011
JOURNAL FREE ACCESSMany important problems of are dressing are being remained without any solution on the fine ranges of particles which are not able to size with ordinafy screens.
Consequently, the sizing analysis of those fine particles may be the most important of the fundamental investigations in order to solve those problems.
By above considerations, we have been trying to investigate those problems, the essential results can be summarized as follows:
1) The photo-tube method, applying Stokes' law to the sedimentation of suspensions, was shown conveniently applicable for the sizing analysis of perticles as fine as minus 200 meshes.
2) For this measurement, it should be selected the medium solution having the value near zelo of polar moment because the polar moment of suspensive medium affects the settling velocity of suspensoid.
3) After testing this method on the medium solids used in the heavy fluid separation at Hitachi, Ashio and Hosokura mines, the almost satisfactory results were abtainecl.View full abstractDownload PDF (1258K) -
On the Equilibrium in the Reduction of Solid Cuprous Sulphide by HydrogenKingo SUDO1951 Volume 67 Issue 754 Pages 116-119
Published: March 25, 1951
Released on J-STAGE: July 13, 2011
JOURNAL FREE ACCESSThe equilibrium in the reduction of solid cuprous sulphide by hydrogen gas has been studied with the aid of a dynamical method as described in the first report. The effect of temperature upon the equilibrium constant and the free energy change in the reaction within the range 727-872C has been determined. The experimental data are summarized by the equations as follows: Cu2S(β)+H2=2Cu(s)+H2S;logKp=-2140/T-0.962
By combining the equations here determined with the known data of hydrogen sulphide, the following equations have been obtained with regard to the dissociation pressure of solid cuprous sulphide.2Cu2S(β)=4Cu(s)+S2;logPs2=-13666/T+3.176ΔF°=62508-14.527T
And also by combining the values here obtained with the existing ones, the following thermodynamic values in relation to the formation of solid cuprous sulphide have been calculated.2Cu(s)+S(r)=Cu2S(α)ΔH298.1=-19942calΔF°298.1=-21293calView full abstractDownload PDF (676K) -
Keijiro NISHIO1951 Volume 67 Issue 754 Pages 120-125
Published: March 25, 1951
Released on J-STAGE: July 13, 2011
JOURNAL FREE ACCESSAs I occupied the site of the mining engineer in Chief at the Osaka Mining Burean 1907 9, I was favonred to visit the several mines of pyrite deposits in the crystalline schists region of the Southern part of Japan, and, especially spent some plenty days in the Besshi copper mine. In 1909 I have published a paper, describing that the so-called pyrite beds in the crystalline schists would be fissure-filling veins. When I was studying pyrite deposits in the Berg-akademie, Freiberg, Germany, and the cry-stalline schists in fhe Uniersitat, Wien, Austria, the 1st World War arose, September, 1915, I was obliged to get of alone, baying all materials in Wien. On the way to America, I have studied the ore-deposits of the Rio-Tinto mine, and others, Lpain.
After visiting the mines of America and Canada from Oct., 1915-Feb., 1916, I have stayed in Boston, attending to the Mass. Inst. Tech. and the Harvard University to study geology. Meannhile I investigated thegenesis of the native copper deposits in the Keweenaw Cape, and the iron are deposits in the Mesabi Range, Mich., to the end of 1915. After returning to home, I hane spent a long years to prospect the petroleum in Totomi, Shizuoka Pref., and to study the diagenesis of the Quarternary and its structure with my patented instruments.
The 1st Coference of the Mining Engineering, have stimulated me to recollect the former experience and to combine my recent study Ai, hich was prepared in my mind. In this paper I shall express my idea about it, that is to say, the ore-deposits of the Besshi copper mine is considered by me the replacement of lime-stone by cupriferous pyrite.View full abstractDownload PDF (3905K) -
1951 Volume 67 Issue 754 Pages 126-130
Published: March 25, 1951
Released on J-STAGE: July 13, 2011
JOURNAL FREE ACCESSDownload PDF (1128K)
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