著者

福井 勝則 大久保 誠介 本間 直樹

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材

巻号頁・発行日

vol.112, no.5, pp.303-308, 1996

被引用文献数

7

---

A method to estimate rock strength with TBM cutting force is proposed. It is assumed that thrust force for a disc cutter increases linearly with product of rock strength and cutting depth. This assumption leads to the following equations:<BR>(Rock strength)&prop;(Resultant thrust force)/(Penetration rate)<BR>(Rock strength)&prop;(Resultant torque)/(Penetration rate) <SUP>1.5</SUP><BR>By the method, rock strength along Niken-goya tunnel was estimated. The tunnel mainly consists of sandstone and slate. Estimated rock strength well agreed with the results of geological investigation; extremely small strength in fragmented slate, on the other hand, very large while boring through massive sandstone. The estimated rock strength was compared with the results of Schmidt hammer test, and it was found that the correlation between the two was excellent. Correlation between estimated rock strength and rock classification was also examined. It was found that the correlation existed, however, the classification used was too rough to evaluate the proposed method precisely.<BR>The proposed method is relatively simple and requires only three values: thrust force, torque and penetration rate. It can be said that the proposed method is promising for real-time estimation of rock strength on the face.

著者

覺本 真代 坂本 靖英 宮崎 晋行 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.9, pp.117-130, 2018-09-30 (Released:2018-09-12)

参考文献数

37

---

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, in order to improve the accuracy for evaluation of stress distribution occurring on production well during depressurization, it is necessary to construct the numerical model enable to reproduce unsteady change of the relationship between shear stress and strain occurring on the contact surface between well and layer and introduce into geo-mechanical simulator. In this study, targeting three contact surface locating above depressurization interval such as 1) casing-cement, 2) casing-layer and 3) cement-layer consisting of different material, we conducted push-out test in laboratory in order to evaluate the frictional behavior at these contact surface based on the relationship between displacement and axial load. From experimental observation, it was found that shear stress occurring on the contact surface linearly increased at the initial stage in the case of steel-cement specimen. On the other hand, for specimens consisting steel-clay and cement-clay, non-linear increase of shear stress was confirmed in the process leading to the shear strength. In addition, shear strength τmax for each contact surface increased depending on effective stress σ ', effective friction angle δ' and effective cohesion c' as failure criteria was estimated based on τmax and σ '. Then, constitutive equation of variable compliance type was applied for reproduction of the relationship between displacement and shear stress observed in a series of push-out test. Through numerical simulation by introduction of this constitutive equation, we confirmed the validity of modeling of the frictional behavior.

著者

矢嶋 澄策

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.68, no.770, pp.341-346, 1952-08-25 (Released:2011-07-13)

---

In this paper, the writer first makes a historical research of mercury mining in Japan.Japan had stbstantial mercury production as early as 7th century, but since then the production showed downward trend and become none in and after 16th century, chiefly due to the lack of geological knowledge and mining engineering. Sine the beginning of this century, a number of new mercury mines were discovered, which brought forth a few tons of mercury only. But the discovery of the Itomuka mine in 1936 changed the whole feature. During the Pacific War, the mercury production in Japan showed peak production of 245 metric tons in 1944, 80 percent of which from the Itomuka mine. But the end of war cut the production sharply again, the Itomuka mine operating only.However, according to the writer's study, it is possible to vaise the production again.The writer states his geological and mineralogical study on the structures and origins of Japan-ese mercury mines, suggests advisable principles for prospection and illustrates profitable methods of mining, dressing and smelting for smaller mines from his 15 years study and experience at Itomuka mine. Then the writer con ludes that Japanese mercury mines, maney but comparably small and low-graded, will be able to meet domestic requirement not in the long future, if they are operated after study of special treatment.

著者

船津 貴弘 平島 美和 笹木 圭子

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.8, pp.110-116, 2018-08-31 (Released:2018-08-28)

参考文献数

2

---

An Advanced Graduate Program in Global Strategy for Green Asia (GA) is a component project of the "Program for Leading Graduate Schools" which is supported by the Japan Society for the Promotion of Science (JSPS) and started in 2013. The concept of a “Green Asia” is a bold ideal. Some of the most challenging global environmental conditions now exist in Asia. Many developing countries face the difficult task of raising millions of citizens from poverty. Consequently, environmental concerns are often overlooked. The key to this complex issue is scientific innovation and a transfer of knowledge from technologically advanced to less advanced nations. This educational program aims to cultivate leaders in science and technology who are able to contribute to the realization of an Asia where ecology and economic growth can coexist. Only 20 exceptional students including 10 Japanese and 10 international are allowed to enroll in the GA program each year. This elite group are taught in a bespoke educational environment, also benefitting from the vast collective resources and shared facilities of KU. The students are offered a financial support in order attract the premium candidates and to maximize the available study time by avoiding the need for part time jobs. The students of the Green Asia Education Program follow a stage gate system. This system comprises of six stages, Research Laboratory Rotation, Practice School, Coursework, International Seminar, Internship and the Green Asia Seminar. All activities described above are carried out in English in order to educate international and multicultural sense. Through these program, the students acquire five abilities, which are research, global perspective, leadership, practice and system landscape. In addition, applied skills such as expansion, analysis and upstream thinking skill are also trained by various activities, especially, practice school and international internship. As first batch students had finished this program in March 2017, we introduce the GA program and how the program is managed and carried out in order to make this program better.

著者

鶴見 憲二 藤井 伸一郎 中川 哲夫

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.111, no.6, pp.381-386, 1995-06-15 (Released:2011-01-27)

参考文献数

1

被引用文献数

1 4

著者

高野 雅俊 浅野 聡

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.8, pp.105-109, 2018-08-31 (Released:2018-08-22)

参考文献数

12

---

Gallium is used as a raw material for a CIGS solar cell. In the manufacturing process of CIGS solar cells, only 30% of the target material is used, and the rest is not used and becomes a spent target scrap. In order to recover gallium from spent target scrap, we investigated the process composed of hydrometallurgical treatment only which does not require pyrometallurgical treatment. We describe the details of the developed process in this report.

著者

児玉 淳一 立川 多久登 中 良介 濱中 晃弘 板倉 賢一 出口 剛太 福田 大祐 藤井 義明

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.7, pp.91-98, 2018-07-31 (Released:2018-07-31)

参考文献数

24

---

Small-scale underground coal gasification (UCG) model tests with a linking hole were carried out using two types of specimens made of either block coal or crushed coal to clarify their characteristics of combustion and gasification. Many similar characteristics were found between both specimens in terms of temperature change and its spatial distribution as well as concentration and heating value of each gas product as long as the crushed coal specimen was sufficiently consolidated. The shape and dimension of the cavity formed in the both specimens were also similar. Texture of the both specimens was changed after the combustion and gasification. Initiation of radial cracks from the linking hole was found in the both specimens. Within the zone with the radial cracks initiation, grains in the crushed coal were bonded whereas cleats in the block coal were healed. The grain bonding and the cleavage healing can be explained by melting and expansion of coal due to temperature increase. The radial cracks are likely initiated after the grain bonding or the cleavage healing due to tensile thermal stress induced by temperature gradient in the coal specimens. It can be concluded that the characteristics of combustion and gasification of the crushed coal and the block coal are similar because both types of coals become similar in texture through combustion and gasification. These results indicate that characteristics of combustion and gasification of coal seam can be mostly estimated from a model test with artificial coal seam made of crushed coal.

著者

濵中 晃弘 蘇 発強 板倉 賢一 髙橋 一弘 佐藤 孝紀 児玉 淳一 出口 剛太

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.7, pp.81-90, 2018-07-31 (Released:2018-07-31)

参考文献数

24

---

Underground coal gasification (UCG), a technique used to recover coal energy by the in-situ conversion of coal into gaseous products, enables recovery of coal energy from the potential coal resources abandoned under the ground for either technical or economic reasons. However, it might be difficult to adopt conventional UCG systems in Japan because of geological conditions that are complicated by the existence of faults and folds. Additionally, it is difficult to control the combustion/gasification area during UCG process because the process is invisible. Therefore, a co-axial UCG system that is compact, safe, and flexible to adopt is suggested with monitoring system by means of acoustic emission as an alternative UCG system. This UCG system has superiority in terms of applicability compared to the conventional one, but the recovered energy from the coal is relatively low because the gasification area in a co-axial system is limited around a well. In order to develop co-axial UCG system with high efficiency, the model UCG experiment with a large-scale simulated coal seam were conducted. It has been shown that 1) the gasification period can be extended by adopting proper oxygen inflow, 2) it is possible to control the combustion/gasification area and the product gas quality by controlling the position of oxygen inflow, 3) acoustic emission monitoring is an effective technique to evaluate the combustion/gasification area.

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

佐々木 昭士 秋吉 利男

出版者

一般社団法人 資源・素材学会

雑誌

日本鑛業會誌

巻号頁・発行日

vol.80, no.915, pp.784-785, 1964

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

山口 梅太郎

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.6, pp.67-73, 2018-06-30 (Released:2018-06-30)

参考文献数

14

---

The Chichibu region located in Saitama Prefecture is a limestone mining area. Mt. Buko limestone deposit is located in the Chichibu region and is being collaboratively mined by Chichibu Taiheiyo Cement, Ryoko Lime Industry, and Buko Mining companies by bench-cut from the top of Mt. Buko. Since the start of mining from the top, Mt. Buko has produced about 260 million tonnes of limestone until the end of March 2017 and a large rock slope (over 400 m high, about 2 km wide, and with overall inclination of 45°) has formed. Currently, managing the stability of the rock slope is considered the most important and critical issue at Mt. Buko. The Task Group for Research on Rock Slope in Chichibu Area (Chichibu Zanken) was established before the start of the cooperative mining at Mt. Buko. The Chichibu Zanken is composed of engineers (especially younger engineers) from the three companies and its first meeting was held in November 1973. In the 45 years since then, the Chichibu Zanken has continued to meet and has held a total of 450 meetings. In the beginning, activities of the Chichibu Zanken were more fundamental, focusing on collecting information on slope stability and studying to design a stable rock slope. Since around 1994, monitoring and analysis of slope behaviors have actively intensified. After the typhoon in September 2007, a significant but short-term slope displacement was detected. From analysis of current and previous data, it was found that the rock slope was affected by heavy rainfall. Therefore, slope drainage, pavement to suppress water permeation, steel pipe piling, retailing rock piling on the rock slope, and their effects on slope stability are important discussion subjects for the Chichibu Zanken. Mining of Mt. Buko is ongoing and making the slope to extend further. The Chichibu Zanken is set to play a key role based on accumulated knowledge and cooperation to solve future unforeseen problems.

著者

出口 衛 幾世橋 広 榎本 兵治

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.111, no.8, pp.537-542, 1995-07-25 (Released:2011-01-27)

参考文献数

20

---

In order to investigate the effect of moisture on the effective thermal conductivity of porous rocks, eighteen rocks conditioned at dried, moist and water-saturated conditions were used for measuring the thermal conductivity by a transient hot wire comparison method developed by Deguchi, et.The moist rocks were conditioned in the atmosphere of 20°C and 60% relative humidity. This condition was adopted on the base of X-ray analysis of montmorillonite to simulate the natural dry condition, at which montmorillonite contained two layers of water in its interlayers.The results showed that the effective thermal conductivities of all rocks increased with increase of water in the pore. The conductivity of zeolite rocks is most affected by the degree of saturation of water. The thermal conductivity of water-saturated rocks is 1.2 to 2.5 times higher than that of the dry rocks.

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

---

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

永井 燈文 柴田 悦郎 中村 崇

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.129, no.12, pp.694-700, 2014-12-01 (Released:2014-12-01)

参考文献数

19

被引用文献数

2 2

---

Platinum group metals(PGMs), such as rhodium(Rh) and ruthenium(Ru), are rare and unevenly distributed in the earth's crust. They are used in automobile catalytic converters and electronic equipment. The consumption of such rare resources is unsustainable; therefore, recycling technologies are needed. In this paper, the chemical properties and separation/recovery of Rh and Ru, and PGM smelting/refining technologies are reviewed. In PGM refining processes, Rh and Ru are converted into chloride complexes. To effectively separate each metal, operating conditions of the reaction have to be optimized. The valences of PGM chloro-complexes change with redox potential, and the distributions between chloro- and aquo- complexes vary with chloride ion concentration. The Ru and Os oxides are separated by distillation.

著者

海見 悦子 高橋 栄二 橋口 大介 藤原 和弘

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.122, no.1, pp.1-11, 2006 (Released:2007-02-24)

参考文献数

41

---

Recently, many and various microbial products appear on the market. However, almost all of them could not have sufficient effects. The expectation of users to microbial products is rising up. It is because of the directions for the environmental friendly and sustainable industrial activity. In addition, it is expected that the development of genetic engineering can make the possibility for the practical use of potential ability of microbes which is still not known.There are two major problems in practical use of microbial products. First, the transplanting of microbes into the target environment is not easy. Because, many indigenous microbes are inhabit in the industrial field and they doesn't allow introduced microbe(s) to be dominant in the field. Moreover, the environment of target fields is very fickle for introduced microbes. Second, the insufficient information of products promotes the misunderstanding to the users for the effect of the products.To the practical use of microbial products in the industrial fields, the researches and developments of reliable and effective products are required. Thereby, the preparations of special feeding and habitat are important for introduced microbes. Moreover, the analyses of microbes transplanted in the industrial fields are important to guarantee both the quality of the products and the correct information to users.The purpose of this communication is the clarification of present challenge for the practical use of microbial products in the industrial fields. Then, this communication suggests the several ways for the research and development of reliable microbial products and useful analytical methods for microbial community by genetic engineering.

著者

幾尾 憲伍 蒋 飛 辻 健

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.5, pp.60-66, 2018-05-31 (Released:2018-05-31)

参考文献数

18

被引用文献数

1

---

Hydraulic properties of fracture are directly related to shale-gas production, oil/gas reservoir and geothermal reservoir distribution. The permeable fracture could work as fluid pathway, but the fracture sealed by minerals (i.e. less permeable fracture) could work as seal in reservoir. Thus, hydraulic properties of the fracture are important in reservoir fluid managements. Because fracture typically has heterogeneous geometry, it is difficult to model the fracture using analytical approaches (e.g., rock physics model). Permeability of fracture is often measured by laboratory experiments, however few studies have focused on calculating permeability by using fluid flow simulation on digital fracture models. Here we used Lattice Boltzmann Method (LBM) to calculate the fluid behavior in 3D digitalized fracture models. The permeability derived from LBM simulation agrees with the laboratory-derived results. We used two natural fracture models: before and after shear deformation. We observed large-scale fluid flow network in the sheared model. We further observed permeability anisotropy for the sheared model, although the anisotropy was not clear in the non-sheared model. The permeability normal to shear direction is larger than that parallel to the shear direction. We then discussed the Representative Elementary Volume (REV) of the hydraulic properties of these fracture models. We extracted several subdomains (i.e., small fracture models) from the whole model and estimated permeability of the subdomains. When the size of subdomain is small, the values of estimated permeability widely vary by the location of subdomain. Convergence of the permeability data is found when the model size is close to the whole model. The REV of the sheared model is larger than that of the non-sheared model. Because the hydraulic properties of fracture models smaller than REV are largely influenced by local heterogeneity, the estimation of REV using the proposed method is important to calculate meaningful hydraulic properties.

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

---

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

宮本 久米太

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.43, no.503, pp.178-197_1, 1927 (Released:2011-07-13)

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)