著者

川上 武文

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.105, no.11, pp.801-803, 1989-10-25 (Released:2011-01-27)

著者

大久保 敬祐 高橋 弘樹 田口 正美

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.135, no.2, pp.8-14, 2019-02-28 (Released:2019-02-21)

参考文献数

27

被引用文献数

1

---

Pushed by human activities, the atmospheric CO2 concentration has reached levels which have made extreme weather events more likely, and which threaten permanent climate changes for the world. In order to combat this, CO2 emissions must be reduced significantly. Electricity production and industry are two sectors which contribute greatly to the production of CO2, thus a reduction in the amount of CO2 produced by thermal power plants and factories could make a significant contribution to combatting climate change. The electrochemical reduction of CO2 in those sources is considered very likely to be a solution to the problem. In this study, the activity of a Pt oxide electrode in the electrochemical reduction of CO2 was investigated in a sulfuric acid solution. Pt oxide electrodes have shown superior activity for the methanol oxidation reaction, which is the reverse reaction of CO2 electrochemical reduction. Cyclic voltammetry of the Pt oxide electrode in a CO2-saturated H2SO4 solution showed a definite anodic peak at 0.6-0.8 V vs. SHE, which was not observed in an Ar-deaerated electrolyte. Thus, it was determined that the anodic peak could be related to the re-oxidation of the reduction product of CO2 during cathodic polarization. The activity of the Pt oxide electrode for CO2 reduction was much higher than that of the Pt electrode. It was concluded that the residual oxygen, which was hardly detected in the Pt electrode, improved the activity for CO2 electrochemical reduction on the Pt oxide electrode. Gas chromatography-mass spectrometry of the electrolytic solution after CO2 reduction revealed that the reduction product was mainly CH3OH. These results should be very useful for developing a new electrochemical reduction system for converting CO2 into CH3OH.

著者

古川 博文 松井 紀久男 島田 英樹

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.121, no.9, pp.446-455, 2005 (Released:2007-02-24)

参考文献数

6

被引用文献数

1 3

---

India is the third largest coal producer in the world and has substantial coal reserves. It produced about 340 million tons of coal in 2002-2003. Open cast production accounts for 80% of the total output and the remaining 20% is from underground. The share of the underground output in the total production is expected to remain at the current level through 2010 even as the coal production increases. Despite its huge resource of coal, the quality of Indian coal is not so good. A considerable amount of good quality coal deposits in India lies in the thickness range of 5-12 m. However, an appropriate mining method for such thick seams could not be developed so far.The coal's share of total electric power generation in India is 75.5% in 2001. Because it is a reliable, domestic, and low-cost source of fuel, coal has played and will continue to play a significant role in the development of the Indian economy. Production, processing, and consumption of coal, however, can have significant environmental impacts, if not properly managed.The paper describes the present situation of the Indian coal mining industry, discusses problems in thick seam mining methods, and proposes a new mining method for thick seams considering today's environmental issues in Indian coal mining.

著者

藤原 達央 大川 浩一 加藤 貴宏 菅原 勝康

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.135, no.1, pp.1-7, 2019-01-31 (Released:2019-01-31)

参考文献数

33

被引用文献数

4

---

This study investigated an effective method to desorb CO2 from low-concentration (0.2 mol/L) monoethanolamine (MEA) solutions using calcium chloride (CaCl2) and ultrasound irradiation at 25 ºC. The pH value of the solution had a large influence on the desorption ratio of CO2 from MEA solution under ultrasound irradiation. CO2 was successfully desorbed up to pH8.2, and it was impossible to desorb CO2 at pH over 8.2. It was clarified that CO2 desorption by ultrasound irradiation is useful for the concentration of MEA solution of up to 2.0 mol/L, because the pH rises above 8.2 when the concentration of MEA solution is increased to above 2.0 mol/L. It also became evident that the addition of small amount of CaCl2 further increases the amount of CO2 desorbed during ultrasound irradiation.

著者

ぐろすうゑのる きるばーと、ゑつち

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.21, no.244, pp.500-516, 1905

著者

井澤 一郎 氏家 英明

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.100, no.1160, pp.944-948, 1984-10-25 (Released:2011-07-13)

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Nakatatsu Mine, which is located nearly in the central part of Honshu Island of Japan, is a lead and zinc mine, where pyrometasomatic lead and zinc deposits in skarn masses have been mined.The annual output of crude are in this mine is 410, 000 tons with the average grade of 25 grams per ton silver, 0.38 percent lead and 5.38 percent zinc respectively.The lead and zinc concentrates prepared here are processed at the smelting and refining plants of Mitsui Mining & Smelting Co. Ltd. In 1973, a trackless mining system was introduced into Nakatatsu Mine and to secure more increase in are production, various improvements for the mining facilities such as streamlining its transportation network and various large-sized rock drilling machines were also carried out.Basing on such improved technologies, a mechanized cut and fill method was employed and as a result, the total efficiency per man-month has risen to 227 tons in 1982 from 189 tons in 1973.

著者

尾原 祐三 吉永 徹 濱地 亮

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.12, pp.222-231, 2018-12-31 (Released:2018-12-27)

参考文献数

19

被引用文献数

4

---

This paper described the use of a drone in collecting data and analyzing images for monitoring of rock slope. The drone consists of four electric rotors and equips with 4K camera. Firstly, the fundamental experiments were performed by the developed monitoring system with the drone. A measurement accuracy was discussed for method of collecting and using image data. As the results, it is made clear for obtaining a high measurement accuracy that the distance between slope surface and drone is less than 20m for collecting data, and that the overlap of images is 80%, and that GPS data and coordinates of GCP (Ground Control Point) are used in analyzing images. After that, the system was applied to rock slope of an open pit mine and a quarry. The three dimensional model can be constructed with a high accuracy. Furthermore, the change of shape of rock slope can be estimated with the lapse of time. Basing on these results, it is concluded that the developed system is very effective for monitoring rock slope.

著者

兵庫 信一郎 外尾 善次郎

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.86, no.993, pp.895-899, 1970-12-25 (Released:2011-07-13)

参考文献数

6

---

The slicing mining method in coal mine is one of the most concentrated and rationalized coal mining method, and it has not only many advantages but also disadvantages.As well known, it is very difficult to use the self-advancing support in this method. We introduced several selfadvancing supports which are now used in USSR and discussed its application in our coal mines. If we can use the mechanical supports in slicing method, the mining productivity will be increased much more.

著者

成田 光好 大鹿 淳也 豊原 哲彦 岡本 信行 白山 義久

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.131, no.12, pp.634-638, 2015-12-01 (Released:2016-01-01)

参考文献数

9

被引用文献数

2

---

Japan Oil, Gas and Metals National Corporation (JOGMEC) conducted the Environmental Impact Study research from 2008 fiscal year under contract to the Ministry of Economy, Trade and Industry (METI) for the commercialization of Seafloor Massive Sulphide (SMS). It is necessary to consider the potential impacts of mining on the surrounding environment and to promote the project for long-term perspective. Particularly, because the specific chemosynthetic ecosystem and the unique biological communities exist around the hydrothermal area, the quantitatively evaluations of the environmental impacts and the conservation measures of biodiversity to avoid or reduce the effects on them as much as possible is required. The environmental assessment programs consist of baseline survey, environmental impact modeling, and the methodological concepts that will be applied to conserve biodiversity. In this paper, we will introduce the review of the project during 2008-2012 and the future prospects of EIA project for SMS mining.

著者

米谷 博行 飯島 庸三 嶋田 高能 成沢 正

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.294-298, 1967-02-25 (Released:2011-07-13)

著者

水落 洋一

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.12, pp.601-605, 2006-12-25 (Released:2009-10-02)

---

To maintain the big mining operation rates for 700kt/day material movement at Batu Hijau Mine in Indonesia, many modern technologies have been employed. Some of them are introduced in this report. They seem to be traditional in one glance but you may find that they are the state of art technology of modern mining applying in the unique style.

著者

堀井 善司

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.108, no.8, pp.575-578, 1992-08-25 (Released:2011-01-27)

被引用文献数

1

---

This is to describe a Large Offroad Dump Truck Unmanned Navigation System used in Torigatayama Limestone Quarry.The system has been developed with cooperation of Nittetsu Mining Co., Ltd. and Shin Caterpillar Mitsubishi Ltd. and equipped on CAT 777B (85 tons payload). The system has been in production use.The Unmanned Truck enables high speed travelling under severe climatic conditions.The Unmanned Dump Truck Navigation System has following features.1) The system is an Autonomous Guidance System and does not need large ground facilities such as guiding lines.2) The system is of all weather type and can be used day and night under severe climatic conditions in quarries.3) The system is composed of multiple fail-safe constructions.4) The system is fleet system that controls a set of trucks as a fleet.5) The system has a learning function of a loading position.6) The system has maximum ground speed of 30 km/hr in forward and 10km/hr in reverse, which enables high speed travelling.

著者

遠藤 龍次

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.27, no.313, pp.211-219_1, 1911-03-31 (Released:2011-07-13)

著者

房村 信雄 今井 直哉

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.67, no.758, pp.413-418, 1951-08-25 (Released:2011-07-13)

著者

三沢 清扶 高橋 昭教

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.955, pp.1343-1345, 1967-11-25 (Released:2011-07-13)

著者

清水 賀之 畠山 信夫 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.10, pp.142-150, 2018-10-31 (Released:2018-10-26)

参考文献数

21

被引用文献数

5

---

A numerical analysis is conducted to examine an air-lift pumping system for mining rare-earth rich mud under 6000m deep seabed around the Minami-Tori-Shima. The numerical scheme in the analysis adopts the one-dimensional drift-flux model, which solves pressure and velocities as well as volumetric fractions of each phase in the air-slurry two-phase flow along a lifting pipe. The empirical formulas derived from experiments using rare-earth rich mud around the Minami-Tori-Shima estimate the pseudoplastic viscosity and the rheology constant as a function of volumetric concentration of mud in slurry. They are devised in the scheme to evaluate the pressure drop in air-slurry two-phase flow as the power-law fluid. Parametric studies were conducted to examine steady characteristics of the air-lift pumping system by changing the air flow rate, the water depth where the air was injected and back pressure. As a result, the basic characteristics of the air-lift pumping system were clarified. For example, with the air flow rate of 6kg/s, depth of water where air was injected of 3000m, back pressure of 0.2MPa (G), 6040m lifting pipe out of which 6000m is submerged, and 40m is above sea level, pipe diameter below the depth where the air was injected of 0.15m and above that depth 0.2m, it was found that the maximum mud flow rate was 1.01x103t/d, volumetric concentration of mud was 6.2%, slurry velocity was 3.8m/s, mixture velocity at the exit of the lifting pipe was 52m/s and power required was 2.0x103kW. In addition it was found that the performance of the system decreases when using the scheme as the power-law fluid compared with the one using the Mori-Ototake formula as Newtonian fluid. Furthermore, specifying back pressure is useful because of increased efficiency of the system, as well as for keeping the mixture velocity down at the exit of the lifting pipe.

著者

杉尾 学 豊田 典明 梶谷 啓介 大和谷 誠 中原 健一

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.130, no.10_11, pp.453-464, 2014-10-01 (Released:2015-10-02)

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Sumitomo Osaka Cement Co., Ltd. (SOC) Kokura Mine and Mitsubishi Materials Corporation (MMC) Higashitani mine adjoiningly operate limestone mine at Hiraodai area in Kita-Kyusyu city, Fukuoka prefecture. MMC Higashitani mine need to replace underground facilities when bench down from current mining level in order to secure future minable deposit. SOC Kokura mine has undeveloped mining area between Higashitani mine, but cannot utilize their plenty minable deposit since there is no way to carry limestone to their cement plant because Kokura mine is located inland. In order to solve above issues, both mines started joint development project by focusing on the following five points. 1 Utilize the limestone deposit in SOC's undeveloped mining area and boundary area of both mines. 2 To plan production and shipping quantity for the purpose that all joint develop area can end mining at the same time. 3 Confirm content of installed facilities and investment cost between both companies and clarify way of cost allocation. 4 Ensure the safety operation and seek minimum cost. 5 Joint work to acquire necessary license/Approval and to solve social issue with local community. This joint project is not only aim to secure the limestone deposit, but also enable us to built long term supply system, obtain new customers and improve operating ratio by joint use of their facilities. And this approach would be the one of the ideal model of limestone mine.

著者

石川 明良 谷繁 岳志 田井 朝香 鈴木 祐麻 新苗 正和

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.131-136, 2018-09-30 (Released:2018-09-27)

参考文献数

13

被引用文献数

4

---

Chloride is one of the effective medium in which platinum group metals (PGMs) can be brought into a solution, thus chlorocomplexes are particularly important in the process chemistry of PGMs separations. Rh (III) chlorocomplexes are poorly extracted into organic solvents, which is due to the charge of the complex as well as those inert character in a solution, that is, formation of RhCl6-n(H2O)n(3-n) - (n=1-6) . The problem of solvent extraction of Rh from chloride solutions has not yet been solved and there is no effective industrial extractant for Rh. PGMs are traditionally separated from one another and the other metals by a complex series of selective precipitation techniques. These are generally inefficient in terms of the degree of separation achieved. Solvent extraction applied to refining process for PGMs offers several advantages over the traditional precipitation methods. Adding Sn (II) to a Rh (III) feed is a good procedure which can be used to make Rh react more easily to extraction, however, stripping of Rh from the loaded organic pahse is very difficult. In the present study, the extraction of Rh from hydrochloric acid solutions with tri-n-octylamine (TOA) and tri-octyl methyl ammonium chloride (TOMAC) were tested to clarify the effect of addition of Sn (II) on the extraction of Rh and stripping of Rh.

著者

伊藤 聰 阿座上 竹四

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.109, no.3, pp.185-190, 1993-03-25 (Released:2011-01-27)

参考文献数

12

被引用文献数

2 1

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Phase relations in the Fe3O4-ZnFe2O4-Fe2O3 system at 1, 100 K have been determined by the X-ray microanalysis and X-ray diffraction studies of the quenched samples. The results show that in the Fe304-ZnFe2O4 system magnetite (Fe304) and zinc ferrite (ZnFe2O4) form a complete series of solid solutions which is in equilibrium with the Fe2O3 that is practically pure.The activities were measured by an e. m. f. method using the stabilized zirconia solid electrolytes. Both the activities of magnetite and zinc ferrite in the Fe3O4-ZnFe2O4 solid solutions coexisting with the Fe2O3 exhibit slightly positive deviations from Raoult's law at 1, 100 K. The activity coefficient at infinite dilution, γ0ZnFe2O4 at 1, 100 K was estimated at 2.2.Lattice constants for the Fe3O4-ZnFe2O4 spinel solid solutions in equilibrium with the Fe2O3 obey Vegard's law. It was also found that the excess Gibbs energy of mixing in the Fe3O4-ZnFe2O4 solid solutions coexisting with the Fe203 at 1, 100 K showed small values. These two results are interrelated in the similar behavior, which suggest that activities are closely connected with crystal structures.

著者

原田 道昭

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.107, no.2, pp.147-153, 1991-02-25 (Released:2011-01-27)

参考文献数

13

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Coal ash produced in Japan has been annually increased because of the energy conversion from oil to coal in electric utilities and industries. Coal ash was produced about 7 million tons in 1989 and estimated as much as 14 million tons in 2, 000. It is necessary to decrease a disposal of coal ash and to promote a effective utilization of it.This paper shows an overview of the productions, origins and natures of coal ash, and some technological developments for effective utilization of coal ash, such as the manufacturing of artificial lightweight aggregates, artificial potash manure and SO2 absorbent made from coal ash and lime, and the recovery of metals from coalash.