著者

戸田 薫一

出版者

一般社団法人 資源・素材学会

雑誌

日本鑛業會誌 (ISSN:03694194)

巻号頁・発行日

vol.52, no.615, pp.462-475, 1936-07-22 (Released:2011-07-13)

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This paper is a brief description of the present state of 3 collieries (Taihei, Taiei, and Siritori), which belong to Karafuto Mining Co., Ltd.

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

片岡 みなみ 羽柴 公博 福井 勝則

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.134, no.3, pp.41-45, 2018-03-31 (Released:2018-03-30)

参考文献数

27

被引用文献数

2

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It is known that the rock strength increases with an increase in loading rate. Many studies on the loadingrate dependence of rock strength have been performed under two environments, namely water-saturated and airdried conditions, and the loading-rate dependence has not been investigated well under the conditions of various water saturations observed in situ rock masses. In addition, the quantitative relation between the loading-rate dependence and water saturation has not been examined. In this study, the uniaxial compression test of Sanjome andesite under various water saturations was carried out and the dependence of the strength on the loading rate and water saturation was investigated. The test was performed with alternating two loading rates and the strength corresponding to each loading rate was determined from a single specimen. The test results show that the strength increase with a ten-fold increase in loading rate is almost the same under various water saturations and that the strength increases with a decrease in water saturation. Based on the test results, the theory to explain the dependence of the strength on the loading rate and water saturation was suggested. The variation in the strength was discussed to validate the theory.

著者

澤山 兼吾 土屋 範芳

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.134, no.3, pp.46-52, 2018-03-31 (Released:2018-03-30)

参考文献数

21

被引用文献数

2

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Environmental impact assessment was conducted at the Ohitachi Mine (Cu-Zn-Pb) located in Odate, Akita Prefecture, Japan. Zn concentration in river water exceeded the environmental standard (30 µg/L) even in the downstream of the Mine. Here, treatment facility for acid mine drainage had already constructed, however, the capacity of the facility was not enough to protect the environmental standard of Zn in the downstream. We calculated Zn load (mg/s) and concentration of Zn (µg/L) in individual watershed along the mainstream and branches. Several watersheds which emitted high concentration of Zn were recognized in the mining area. Particularly, discharge of Zn along the mainstream and watershed which includes open adit shows strong effects to concentration and load of Zn in river water. Based on concentration of Zn in river water and flow rate, we calculated mass balance of Zn load between sampling points. In order to protect environmental standard of Zn (30 µg/L) around village in downstream, we have to reduce 4.22 mg/s of Zn load. In that case, we have to reduce discharge of Zn along the mainstream and from open adit in the mining area. Based on the load and concentration of Zn in individual watershed around the mining area, quantitative evaluation is possible to estimate environmental risks of heavy metals in the river water caused by abundant mine.

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

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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

畠山 信夫 清水 賀之 益山 忠

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.134, no.2, pp.31-40, 2018-02-01 (Released:2018-02-27)

参考文献数

33

被引用文献数

1

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One of the authors has developed a numerical simulator of airlift pump to solve governing equations represented by the drift flux model. The solver is based on the finite volume method which is known as SIMPLER algorithm for numerical scheme. The calculated results using the simulator were comparatively in good agreement with experimental ones by Weber et al. and Saito et al., despite lack of appropriate correlations used in the constitutive equations. In this study, the simulator is improved by a recent study (Ishii and Hibiki, 2011) on the constitutive equations of the drift flux model in the gas-liquid two-phase flow. The effect of newly incorporated correlations versus original ones in the constitutive equations is studied on the lifting characteristics such as relation between inputting air and lifted water. Also, flow characteristics along axial direction of pipes are examined to compare numerical results with experimental ones over wide range of pipe diameter and pipe length. Furthermore, pressure losses are grasped from the standpoint of the pump head, the relation between various pressure losses and lifting characteristics is discussed.

著者

岩野 圭太 永江 純一 福井 勝則 羽柴 公博

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.134, no.2, pp.22-30, 2018-02-01 (Released:2018-02-27)

参考文献数

14

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Because blasting is a quite efficient and economical excavation method, it has been widely applied to tunnel excavation especially in hard rock. However, this method is rarely used to the tunnel site close to residential houses due to its environmental impact such as vibration and noise. Nowadays, the advanced electronic detonator, which was widely used in overseas mine site, was introduced to the tunnel site in Japan. This electronic detonator with accurate delay time (=ignition time difference between consecutive holes) has a potential to mitigate blasting vibration. In the past, many studies to lower the blasting vibration had been conducted and in some of them, several ways of simulation were implemented and the relations between vibration mitigation and arrangement of delay time were proposed. In this study, based on the past achievement and blasting test the authors had carried out, the appropriate method to determine the optimum delay time was proposed. In the case of electronic detonator in which each hole has different ignition time, the methods using autocorrelation and frequency analysis were found to be good expectation of delay time to lower the vibration. Also, in the case of conventional electric detonator in which ignition time has dispersion, the relation between vibration and ignition time dispersion was calculated, and the proper way to lower the vibration was proposed. This study gives practical method to set appropriate ignition time to lower blasting vibration.

著者

中村 謙吾 桑谷 立 駒井 武 山崎 慎一

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.134, no.2, pp.13-21, 2018-02-01 (Released:2018-02-15)

参考文献数

36

被引用文献数

4

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Understanding the geochemical characteristics of various soils is significant for revealing the mechanisms occurring under natural conditions, assessing the environmental risks and managing the land use. However these various soils have complex forming mechanisms. This study examined geochemical characteristics of surface soils using statistical analysis. Principal component analysis (PCA), a very commonly used multivariate technique that can extract hidden structures and patterns from high-dimensional data, was applied to 633 classified soil samples. Soil samples collected in the Miyagi and Ibaraki prefectures were analyzed for major elements (Si, Ti, Al, Fe, Mg, Mn, Ca, Na and K) and heavy metals (Cr, Cu, Zn, As and Pb). Major elements showed most distinctive relationships with an inverse correlation between Si and Ti, Fe and Al. Heavy metals did not exhibit clear correlations with each other. However, background concentrations could be estimated using the frequency distribution and log-normal distribution curves. The background concentration of Cr, Cu, Zn, As and Pb were 50 ~150 mg/kg, 75 ~150 mg/kg, 200 ~300 mg/kg, 25 ~50 mg/kg and 30 ~60 mg/kg, respectively. Results of PCA clarified four common factors controlling major elements and heavy metals in the soil samples. They are ‘Physicochemical formation', ‘Soil components',‘ Vegetation effect' and ‘Adsorption and desorption'. Soils are formed by leaching reactions from rain and groundwater and mixed organic matter from different vegetation types. Therefore, major elements and heavy metals in soil are affected by these processes, which are common to most soil types.

著者

覺本 真代 坂本 靖英 米田 純 片桐 淳 青木 一男 瀧口 晃 安井 彩 森 二郎

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.134, no.1, pp.1-12, 2018-01-25 (Released:2018-01-24)

参考文献数

38

被引用文献数

1

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Depressurization process is regarded as the most effective process for gas recovery method from the viewpoints of gas productivity and economic efficiency among in-situ dissociation processes of Methane Hydrate (MH) existing in marine sediments. However, it is supposed that consolidation and deformation of the stratum occurs due to MH dissociation and increase of effective stress in the stratum during operation of depressurization. Consolidation and deformation wreak negative friction on the production well. As a result, the production well may suffer large compressive or tensile stress. In the worst case, it may cause shear failure, tension failure and crushing. Therefore, for optimization of gas production process by depressurization, it is necessary to perform numerical simulation in consideration of a series of phenomenon during MH dissociation in porous media and evaluate the effect of consolidation deformation of the stratum on MH production well. In this study, using the geo-mechanical simulator named as COTHMA developed under MH21 research consortium, we carried out the field-scale numerical simulation for prediction of deformation and stress distribution around production well during depressurization. On the basis of field data for the Eastern Nankai Trough area and the structure of production well for the methane hydrate first offshore production test in 2013, the detailed model for reservoir and production well was constructed. In addition, we conducted push-out test to evaluate the frictional behavior at the interface between screen-gravel pack as the different materials constituting production well and introduced into numerical model for COTHMA. From calculation results, it was found that Mises stress occurring on base pipe installed into the interval of depressurization reached 420 MPa as yield point of steel due to the effect of friction. However, the original shape was maintained because the occurred equivalent plastic strain was about 2.95 % and this strain value was much smaller than 21 % as failure criterion. Furthermore, the effect of interface between casing and cementing was not large. This result suggested that the well structure above the interval of depressurization acted as unit and the interfacial frictional behavior between well and layer was the dominant factor on deformation behavior and stress distribution of casing and cementing.

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)

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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

八木 俊介 池野 豪一 山田 幾也

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.133, no.11, pp.264-269, 2017-11-01 (Released:2017-11-30)

参考文献数

49

被引用文献数

3

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In recent years, the electrochemical water splitting using renewable energy has attracted considerable attention for the production and utilization of hydrogen gas as a fuel. However, the high overpotential for the oxygen evolution reaction increases the electrical power expense and induces degradation of the electrode materials. In order to promote the oxygen evolution reaction by lowering the overpotential and suppressing the side reactions, noble metals and their alloys or oxides have been typically employed as catalysts. Nevertheless, alternative catalysts have been sought in recent years in view of the high cost and limited resources of noble metals. In this review, the recently developed oxygen evolution reaction catalysts are presented, and the requirements for the development of such highly active catalysts have also been discussed.

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

渡 健太 金子 祐輔 大上 悟 大原 秀樹 竹田 賢二 中野 博昭

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.133, no.10, pp.250-255, 2017-10-01 (Released:2017-10-31)

参考文献数

17

被引用文献数

1

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To elucidate the effect of solution composition on the passivation of anode in Cu electrorefining, the potentiodynamic polarization curves were measured by polarizing from -0.2 V versus NHE to 1.0 V using the potential sweep method at 1.0 mV·s−1. The diffusion coefficient was measured by rotating disc electrode method under the conditions of 50, 100, 150, 200, 250 and 300 revolutions per minute of disc electrode and polarizing from 0.34 V to -0.40 V at 10.0 mV·s−1. The critical current density for passivation and the passive current density decreased linearly with total concentration of SO4 in solution regardless of solution composition and the presence of impurities such as As3+,Sb3+ and Bi3+, showing the good correlation between the current density for passivation and the total concentration of SO4. The diffusion coefficient of Cu2+ ions decreased with total concentration of SO4 in solution. The increase in passivation with the total concentration of SO4 is attributed to both decreases in solubility of CuSO4 in electrolyte and the diffusion coefficient of Cu2+ ions. On the other hand, focusing on the effect of kinds of cation on the passivation, the harmful effect on the passivation was largest with Cu2+ ions, and was larger in the order with Li+,Ni2+ and Na+ ions, and was smallest with H+ ions. The diffusion coefficient of Cu2+ ions decreased most with Ni2+ ions, and decreased secondly with Li+ and Na+, and decreased least with H+ ions. The diffusion coefficient of Cu2+ ions decreased with increasing the viscosity of solution.