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86 巻, 987 号
選択された号の論文の9件中1～9を表示しています
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竹内 正勝, 百瀬 寛人, 満田 真寿1970 年 86 巻 987 号 p. 409-412
発行日: 1970/06/25
公開日: 2011/07/13
ジャーナル フリーThe writers applied the mercury halo method to the prospecting of the Black Ore Deposits and had thegood results.
The writers studied the analytical method of marcury and succeeded in obtaining thesensibility of 50ppb by the special distillation method using a fairly simple apparatus.
By this method, numerous analysis were carried out on samples from many drilling cores, the mercury halo of more than 200ppb extend horizontally outside of 300 to 500 metres from Black Ore Deposit and vertically also it extend out for 200 to 300 meter over the orebody.
It is turned out that the background values of mercury in rocks in this district is less than 100ppb.抄録全体を表示PDF形式でダウンロード (681K) -
鈴木 光, 西松 裕一, ヘルセオヨ R.1970 年 86 巻 987 号 p. 413-418
発行日: 1970/06/25
公開日: 2011/07/13
ジャーナル フリーThis paper deals with the rheological behaviour of rocks under the pulsating compressive stress. Thestress-strain hysteresis loops under the action of sinusoidal compressive stress, the frequencies ofwhich range from 0.18rpm to 300rpm, are observed with the cathode ray oscilloscope, and classified into three different type, i. e.
(i) linear type, or perfectly elastic body, the rheological behaviour of which would be represented by a spring.
(ii) elliptical type, or linear visco-elastic body, the rheological behaviour of which would be represented by a combination of spring and dash-pot.
(iii) crescent type, or non-linear visco-elastic body, the rheological behaviour of which could not be represented by any combinations of spring and dash-pot.
For the elliptical type of stress-strain hysteresis loops, the dynamic elastic modulus and the dynamic loss are calculated with respect to each value of the frequency of loading.抄録全体を表示PDF形式でダウンロード (2638K) -
摩擦係数の測定野田 佳六, 川島 俊夫, 吉沢 幸雄1970 年 86 巻 987 号 p. 419-423
発行日: 1970/06/25
公開日: 2011/07/13
ジャーナル フリーCoefficient of friction between pipe wall and solid material when mixture of solid material and water flows through a pipe, was measured under the condition of hydraulic transporting solid material.
When frictional force (F=μsWt) occurs between particle group and pipe wall, reaction force (Ts) of the same magnitude with frictional force acts on the pipe.
F=-Ts=μsWt
The authors measured reaction force and calculated coefficient of friction (μs).
Results obtained are summarized as follows.
(1) According as mean velocity of mixture increases, coefficient of friction decleases rapidly.
(2) Coefficient of friction (μs) was expressed as
μs=μs0 (νm/νm0)-n
where vm=mean velocity of mixture (m/s)
μS0, n=constants抄録全体を表示PDF形式でダウンロード (798K) -
村門 律1970 年 86 巻 987 号 p. 425-430
発行日: 1970/06/25
公開日: 2011/07/13
ジャーナル フリーThrough the present study about the blasting in a coal mine, the author found out the following results.
1) Under certain circumstances, the detonation of an explosive in a charge hole is apt to bring about missfires of the M.S.delay detonators in the nearby charge holes.
2) These missfires mentioned above can be considered to be due to the blasting conditions, such as the kind and the amount of explosives, kind of rocks and especially the line of least resistance.
3) The.author has claimed for a long time that the line of least resistance which is set in the blasting in a coal or a shale must be kept over 40cm for the prevention of blasting accidents and this author's opinion has been ascertained again to be right by the present experiments.
4) The delay time of the M. S. detonators in the adjacent chambers shows the tendency to become shorter with the influence of the stress wave caused by the detonation of an explosive in the nearby charge hole.抄録全体を表示PDF形式でダウンロード (1175K) -
岡田 忠治1970 年 86 巻 987 号 p. 431-434
発行日: 1970/06/25
公開日: 2011/07/13
ジャーナル フリーAt Sazare Mill, copper, zinc and pyrite concentrates are produced by bulk differential flotation, aftereliminating 30 pct weight waste by means of both hand picking and heavy media separation.
Now, a fairly amount of massive sulfides are contained in the crude ore.If they are directly sent to the differential flotation circuit by making use of them for grinding media, it is expected that the load of the primary grinding and bulk flotation will be lightened and that the separation results of the differential flotation will be improved.
With such expectation, the author tried 10 months operational test using 8'×3' conical mill. From the observation of this test, it is confirmed that the sulfide ore pebbles can be used simply instead of conventional balls, but the expected results are not always obtained about the differential flotation, and accordingly the autogenous grinding cannot be adopted into the following daily operation.抄録全体を表示PDF形式でダウンロード (707K) -
神田 良照, 八嶋 三郎, 下飯坂 潤三1970 年 86 巻 987 号 p. 435-440
発行日: 1970/06/25
公開日: 2011/07/13
ジャーナル フリーAn experimental study of the size effects and the energy laws of single particle crushing under slowrate of loading in a coarse size range was carried out by using disks having the dimenstion ratio of1 (diameter) to 0.5 (length) made of borosilica glass, quartz, feldspar, lime stone and marble.
The volumes of prepared specimens ranged 0.2 to 40cm3and the rate of loading is 0.3t/min.
A summary of experimental results was as follows, I) as formulated by equation (5) the elastic strain energy per unit mass of specimen stored up to breaking (E/M) is proportional to 2 power of strength Sd, II) similarly (E/M) is proportional to (-6/m) power of particle size x and is calculated by the equation (11), where m is the Weibull's coefficient of uniformity, III) as illustrated by equation (12) the index of the equation (1) can be calculated from the relation of a=(m+6)/m, IV) as shown in table 2 the values of m obtained by the disk splitting test are larger than the values obtained by the sphere splitting test.
This difference may be caused by the higher restriction of the direction of fracture due to the line contact loading of the disk aplitting test.抄録全体を表示PDF形式でダウンロード (2821K) -
黒鉱浮選精鉱の電位と溶解性との関係吾妻 潔, 後藤 佐吉, 亀谷 博, 斎藤 幸七, 朝倉 岩三1970 年 86 巻 987 号 p. 441-446
発行日: 1970/06/25
公開日: 2011/07/13
ジャーナル フリーThe previous paper concerning about the electrochemical properties of pure sulfide minerals was extended about those of natural flotation concentrates of Kuroko (complex sulfide ore). Teh redox potential of acidic suspension of Cu, Zn, Pb and Cu-Pb concentrates was measured by use of Pt electrode vs saturated calomel electrode of 97°C. The dissolution of a component of the concentrate in suspension of 1 Mole sulfuric acid at that temperature began to proceed at a certain redox potential which is characterized by the kind of component and mineralogical specification of concentrate. For example, Cu in Cu concentrate dissolved at 0.36 volt and Fe in the same concentrate dissolved at 0.48 volt; Cu in Cu-Pb concentrate dissolved at 0.36 volt, while Cu in Pb concentrate dissolved at 0.40 volt.
The results were discussed comparing with potentials of pure sulfide minerals.抄録全体を表示PDF形式でダウンロード (1054K) -
赤瀬川 安彦1970 年 86 巻 987 号 p. 447-449
発行日: 1970/06/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (776K) -
1970 年 86 巻 987 号 p. 450-454
発行日: 1970/06/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (1226K)
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