著者

鈴木 廉生

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.96, no.1112, pp.709-711, 1980-10-25 (Released:2011-07-13)

著者

古賀 義彰

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.85, no.976, pp.581-583, 1969-08-25 (Released:2011-07-13)

著者

梅津 良之 鈴木 信一郎

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.79, no.895, pp.25-29, 1963-01-25 (Released:2011-07-13)

参考文献数

8

被引用文献数

3

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Effect of iron, nickel, zinc and aluminium on anode potential has been studied. Iron exists of copper grain boundaries asα-Fe, so it reacts with Cu++ ions to produce considerable amount of copper slime on anode surface. Consequently, anode potential of iron bearing copper anode is raised. Within the amount as impurities nickel, zinc and aluminium are dissolved in copper asα-solid solution. By the alloying of these elements standard electrode potentials of these alloys are raised, but these effects are very little. During electrolysis of nickel bearing copper anode nickel salt is produced in anode film solution. The presence of nickel salt increase electric resistance, so the anode potential is raised. Zinc atoms in copper anode react with Cu++ ions to produce copper slime on the anode surface. The presence of copper slime yields raise of anode potential. The effect of aluminium is little.

著者

宮坂 正三 早川 典久

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.81, no.930, pp.886-893, 1965-10-25 (Released:2011-07-13)

参考文献数

6

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There are many limonite deposits genetically related to the mineral springs at the vicinity of the Azuma Volcano, Fukushima Prefecture. Near the Nuruyu Spa three limonite deposits are found, and the mineral water shows highly acidity owing to the presence of sulphuric acid.This paper is concerned with studies on the chemical compositions of both mineral waters and limonites, and the relation between the pH of mineral water and limonite depositions. It seems probable, on the basis of the experimental evidence, that the optimum pH range for the iron depositions is 3.5-6.0 and that in this pH range iron precipitation is increased with higher pH. Differential thermal analysis curves and X-ray powder diffraction patterns show that the limonites deposited from the mineral springs essentially _consist of amorphous iron hydroxide containing a small quantities of goethite. Odo or yellow limonite from Akanuma and Fukuo shows the clear X-ray powder diffraction patterns of goethite.And as the result of experiments, it is shown that various minerals such as goethite, lepidocrocite, magnetite, and siderite are formed in accordance with the change of pH from 5.0 to 12.0 when NaOH or (NH4) 3CO3 solution is added to ferrous sulphate solution containing sulphuric acid or oxalic acid.

著者

西出 喜義

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.83, no.956, pp.1719-1720, 1967-12-25 (Released:2011-07-13)

著者

原田 種臣

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.83, no.949, pp.749-753, 1967-05-25 (Released:2011-07-13)

参考文献数

5

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In this study, the extent of variation of the floatability of pyrites in xanthate flotation was measured. Relation between the floatability and crystallographic property, thermoelectric potential, and oxidation property were also investigated.The main results obtained are as follows:(1) The variation of about 30 percent in flotation recovery was recognized under the experimental condition used in this study.(2) The floatability increases with a decrease of the interplanar spacing, absolute value of the thermoelectric potential, and the oxidation rate. But, these relations containing some exceptional data.(3) Besides, “Relation between Floatability with Xanthate and Natural Floatabiliiy”, “Effect of Oxldation on Flotation Recovery” and “Effect of Activation with Copper Sulphate” were also discussed.

著者

阿美 長充

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.81, no.926, pp.526-534, 1965-06-25 (Released:2011-07-13)

被引用文献数

1 1

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In Kushiro coal mine, Taiheiyo Coal Mine Co. Ltd., hydraulic iron props have beers applied successfiy since 1959, and hobels since 1960.A considerable increase of output per manshift has resulted from these mechanization in thin seams. Then we began to use Tandem hobels and MKSP-LIU type selfadvanced roof supports in our thin seams to get more increased productivity, and obtained some good results. The auther report in this paper, the new mechanised organization of winning, several technical and economical data.The auther also discussed the problems of thin seam mechanization, which we must dissolve in future to get a much more high productivity in our coal mine.

著者

江口 元徳 矢沢 彬

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.91, no.1043, pp.39-44, 1975-01-25 (Released:2011-07-13)

参考文献数

24

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Hydrolysis reaction in Co (II)-H2O system have been investigated thermodynamically and experimentally, at temperaturesbetween 25°and 200°C. The results are summerized as follows:(1) The chemical potentials of relating substances at 25°to 250°C were derived by several thermodynamic ways.(2) The hydrolysis equilibrium was discussed thermodynamically, and it was predicted that CoOH+would not be predominantunder the conditions considered.(3) The pH dependences of solubility of Co (OH) 2were measured at temperatures between 25°and 200°C. pH values were measured directly at equilibrating temperatures below 100°C, but were measuredat 25°C for quenched solutions in the experiments above 100°C.(4) Correspondence of pH values between 25°and t°C based on eq.(23) in this paper was confirmed by experiment.(5) Red Co (OH) 2were precipitated in the experiments at above 90°C and thermodynamic behavior agreed well with the theoretical predicitions (Fig. 10).(6) A bluish active Co (OH) 2was precipitated at 25°C as a metaslable form, and for this active hydroxide Ksp=7.8·10-15, μ°298=-107.7 kcal/mol were derived

著者

荻原 研郎

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.84, no.963, pp.822-827, 1968-07-25 (Released:2011-07-13)

著者

三分一 政男 中倉 英雄 大佐々 邦久

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.103, no.1188, pp.109-114, 1987-02-25 (Released:2011-07-13)

参考文献数

18

被引用文献数

2 1

---

Zone settling rates of limestone, coal and kaolin-water slurrieswere investigated using vertical settling cylinders or a centrifuge. Zone settling was divided in dilute and intermediate modes depending on whether or not the aggregates were in contact and formed a network structure, and concentrate mode of intimate contact settling due to compression was followed. Although the higher initial height of slurry brought on the higher settling rate in the intermediate, it was found that in the region of rather lower initial height the settling rate became solely a function ofconcentration.Comparing experimental values with known analytical derivations, Richardson and Zaki's equation modified by Michaels and Roberts' equation were effective for the dilute and the concentrate, respectively. And also, Michaels method of capillary model was impressive for the intermediate in which the settling rate was depended on both of concentration and initial height. It was demonstrated that when the initial height was low enough to correlate the settling rate only with concentration, settling rate of the intermediate was well coincided with predicted rate appling Kynch's theory on the dilute. Zone settling rates of rather wide range of concentration and initial height were able to be summerized as expressed in a figure.If the initial composition is uniform the slurry concentration in centrifuge is independent of radius, but decreases everywhere within the suspension at the same rate with respect to time. Centrifugal settling rate was calculated on the basis of that it was able to be calculated from the settling rate in a gravitational field, field acceleration and slurry concentration accounting for the changingconcentration. Equilibrium thickness of centrifugal sediment waspredicted in the manner which took into account the relationshipbetween compressive pressure and porosity in the sediment. Usingthese values led to good correlation of experimental and calculated sedimentation process in centrifuge over the range of this investigation.

著者

松尾 正人

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.83, no.946, pp.231-234, 1967-02-25 (Released:2011-07-13)

著者

近藤 文次郎

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.71, no.805, pp.347-350, 1955-07-25 (Released:2011-07-13)

---

In this paper the writer likes to describe the features of the deposits of the Shirane mine. According to some investigators, the lower part of the Mt. Motoshirane consists of the Komenashi lava-flows, the upper part the Motoshirane lava-flows and accompaning tuff-breccies. The No.3 deposit described here consists of impregnated free sulphur ore embedded in the tuff-breccia and two pyroxene desite of the Motoshirane volcamo. The ore-forming fluid may be the hydrothermal solution which was ascended through the fissures due to post volcmic displacement.The agglomelatic structure of ring ores in the deposits is very common.Topography and geological structure of the Mt. Motoshirane have great bearing on defining of the deposits as well as on prospecting and mining.

著者

池田 武弘

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.98, no.1138, pp.1225-1229, 1982-12-25 (Released:2011-07-13)

参考文献数

7

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It has been already proved that intrinsically safe circuit voltages can be used from 2 V to 800 V for explosive gas atmosphere, but these values have no relation to electric shock accidents.On account of the reason intrinsically safe circuit voltages in coal mines have been controlled less than about 25 V to prevent electric shock accidents customarily.In case of a fault voltage occured at a part of circuit, however, if the product of the touch voltage and its touch time exists within a certain range, the incidence of electric shock accident will be very low.In this paper the author describes an experimental study of the allowable voltage in intrinsically safe circuit which is based on a small touch time which don't lead to the impediment in a human body under usual circumstances.Synthesizing the experimental results of each paragraph of this paper, the conclusion is as follows;(1) In case of a circuit containing the bare electrode is stalled at a soaked point, usable voltage is under AC 25 V or DC 60 V.(2) In case of a circuit containing the bare electrode is stalled at a point usual dried or a circuit not containing the bare electrode, usable voltage is under AC 100 V or DC 200 V.As for over voltages above mentioned, if the intrinsically safe construction is kept in drip-proof increased safety construction, it will be usable to AC and DC 800 V.

著者

三村 晴夫

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.103, no.1193, pp.461-465, 1987-07-25 (Released:2011-07-13)

参考文献数

9

著者

向山 広

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:21856729)

巻号頁・発行日

vol.83, no.955, pp.1209-1211, 1967-11-25 (Released:2011-07-13)

著者

井上 忠二 石田 丈夫

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.73, no.825, pp.147-152, 1957-03-25 (Released:2011-07-13)

参考文献数

3

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Underground transportation is one of the most important factors for the operation of a mine which can be divided into two problems-transportation at working faces and main adits transportation.High efficiency of transportation at working faces, the author concludes, can only be attained either by adopting a well suited method to the transports employed or its opposite.Described below are the non-pillar overhand inclined long wall slicing method as an examplefor the former which uses scrapers as its main transports, and the short wall top slicing with Kappe method (accompanied with filling) as one for the latter which uses baby-conveyors as its main transports.As regards main adits transportation, however, the descriptions are made with examples based upon the comparisons of:(1) ordinary mine cars and dump cars.(2) cages and skips, and(3) belt conveyors and trolley cars.

著者

中嶋 滋夫

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.90, no.1037, pp.455-460, 1974-07-25 (Released:2011-07-13)

参考文献数

7

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The author describes in the above article the development of the “Super Dynamic SD System” (W-SDSystem), which is one of the most advanced coal mining methods in the world. The W-SD System is not only highly effiicient, but also has a remarkably high safety factor.An English translation of the above article is available under the title of “Development of the Super Dynamic SD-Type High Speed Mining System.”

著者

房村 信雄 黒沢 龍平 小野 重信

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.79, no.902, pp.590-596, 1963-08-25 (Released:2011-07-13)

参考文献数

5

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Relatively high concentration of radon, is released from radium in uranium are deposit and is accumulated in the mine gallery. When radon and its daughter products, they are inhaled into human body with the air, some daughter products, such as 218Po, closely attach respiratory tract and radiate high dose to the organ owing to their alpha particlea. So, the most important case of radiation exposure for the mine workers is an internal exposure carried by alpha irradiations of the inhaled radioactive elements. Therefore, if the attempts to remove radon or it daughter products are achieved, the radiation hazard in the mine will be reduced to the permissible level. One of the attempts for this purpose has been tried using the adsorption property of active carbon (type 2GM, used in gas mask).According to the results, the saturated radon adsorption value As (μc/g) of the active carbon is expressed as following experimental equation.As=6.0×103×(288/t) 12.7×CsWhere t is ambient temperature (°K) of the specimen and Cs is radon concentration (μc/cm) or tne the air. The equation may be correct for temperature range of between 275°K and 305°K. The caluculated value with the equation agrees with that of BET adsorption isotherms.A practical device for radon removal was designed considering this result. And the device wastested in the closed gallery of uranium mine at Asabatake. According the experimental results, it is concluded that if a great deal of active carbon and slicagel are used as a adsorption materials, this method will be of great use for radon removal.

著者

松田 勝彦 田中 信寛 真嶋 宏

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.93, no.1078, pp.969-974, 1977-12-25 (Released:2011-07-13)

参考文献数

12

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The dissolution of hydrogen gas in aqueous solutions was studied in connection with hydrogen reduction of metals from solutions. Dissolution rates as well as solubilities of hydrogen gas in various aqueous solutions were determined by a pressure transducer technique.The main results obtained are as follows:(1) Initial dissolution rates of hydrogen gas in pure water increase linearly with the increase in hydrogen pressure.(2) Hydrogen dissolution in aqueous solutions is accelerated by strong agitaion and high temperature, obeying an empirical formula, R=c exp (αω), in which R is the dissolution rate. c is the function of temperature.α is a constant and ω is the stirring speed.(3) Activation energy for hydrogen dissolution in pure water was apparently found to be around 3 kcal/mol, and this suggests that gaseous hydrogen dissolves at a rate which is diffusion-controlled in water phase.(4) The dissolution rates of hydrogen gas in aqueous solutions depend primarily on its solubilities which is decreasingly affected by the addition of solutes.

著者

伊藤 福夫

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.97, no.1126, pp.1268-1268, 1981-12-25 (Released:2011-07-13)