著者

金 営三 鈴木 光郎 松岡 功

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.102, no.1176, pp.85-89, 1986-02-25 (Released:2011-07-13)

参考文献数

20

---

As a basic research for the application of high gradient magnetic separation, the magnetic susceptibilities were measured in room temperature for some sulfide minerals;pyrite, chalcopyrite, bornite, chalcocite, covellite, sphalerite and galena. The susceptibilities of crystalline pyrites, except 0.46 × 10-6emu/g of colloform pyrite, gave low values of narrow range from 0.16 to 0.28 × 10-6 emu/g, which are independent of the magnetic force.Besides, pyrites from the metamorphic and metasomatic deposits caused to vary the magnetization intensity depending on magnetic force owing to the coexisting minor ferromagnetic minerals as magnetite, hematite and pyrrhotite.Against chalcopyrite, the susceptibility ranged the values from 2.8 to 7.0 × 10-6emu/g, but bornite showed a low value of 0.7 × 10-6emu/g.Sphalerites showed more positive susceptibilities with the increase of iron content, and the curve followed by the values is nonlinear which is similar to the curve, given by Keys et al.(1968).Chalcocite, covellite and galena are diamagnetic substantially.Nevertheless, the first one gave positive valueof 0.04 × 10-6emu/g and the second one 0.5 and 0.9 × 10-6emu/g.In galena only, the negative value was found as- 0.04 ×10-6 emu/g, but it is very small, as compared to pure synthetic PbS.It is thought that the deviations of susceptibilities of the above three minerals might have been caused by the presence of any magnetic impurity within them as iron in sphalerite.

著者

鈴木 光 西松 裕一 ヘルセオヨ R.

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.986, pp.353-358, 1970-05-25 (Released:2011-07-13)

参考文献数

10

被引用文献数

1 2

---

In this paper, the fatigue failure of some rocks under the repeated compressive load is discussed from the point of view that the fatigue failure is a stochastic process. Using a graphical method in which the logarithms of the probability of survival are plotted against the fatigue lives, it is revealed that the probability of survival is represented with the sum of two expotential functions, i. e.p=ξ1·exp (-λ1·N) +ξ2·exp (-λ2·N) where p: the probability of survivalξi: the probability that the failure of test piece occurs by the fracture mechamism with the rate constamtλi N: the number of loading cyclesThis result means that the fatigue failure of rocks consists of two exclusive Poisson's processes of 1st order, each of which would correspond to the inter- and innergranular fracture of the mineral particles constituting the rock.In order to obtain the S-N curve, the effect of the stress amplitude on the rate constant of the fatigue failure is investigated. A series of experiments is carried out at a constant minimum load and several levels of maximum loads.Finnally, it is indicated that the loading frequency has a little effect on the fatigue life of the rock.

著者

伊藤 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.84, no.963, pp.925-928, 1968-07-25 (Released:2011-07-13)

著者

大塚 尚寛

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.138, no.5, pp.60-69, 2022-05-31 (Released:2022-05-13)

参考文献数

38

---

Aggregate is important as a basic material that supports Japan's industrial economy, along with steel, cement, wood, and non-ferrous metals as construction materials for civil engineering and construction. After the Great East Japan Earthquake, the importance of aggregate as a basic material was reaffirmed, and the demand for aggregate is currently in a slight increase or leveling off, and the annual production has been around 380 million tons. In this review, overviewing the transition of aggregate production in Japan from the viewpoint of aggregate resources, the current issues and future prospects are explained. It mentions the shift to mining method in harmony with the environment to enable “sustainable development” on the premise of coexistence with the region, which is an important issue in the mining and production of aggregate. Then, it will be described that trends such as the construction of smart mining system that utilize ICT, IoT, AI, etc. with the aim of responding to labor shortages due to the declining birthrate, aging population, and the advent of a declining population.

著者

門 智

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.1152, pp.142-152, 1984-02-25 (Released:2011-07-13)

参考文献数

12

被引用文献数

2 1

---

Until the discoveries of huge pyrochlore deposits in Brazil and Canada in 1950's, both Nb and Ta had been extracted from Tantalite or Columbite using by solvent (MIBK) extraction technique.Using by the above pyrochlore resources, more than 95% of niobium products, such as Fe-Nb, various grade of oxides (technical, optical etc.) and Nb-metal are produced at present.The application of niobium to steels, optical glass, electronic component, superalloys, refractory metals, superconducting materials and catalysts are discussed in this paper. On the other hand, tantalum has no bright future even though Ta-condencer, cemented carbide and super-anti corrosive materials are stable and reliable markets, so that the total comsumption of Ta in the world to be remaining about 1, 600t in Ta205 during a few years. The consumption of niobium will increase in the field of electronics, superalloys, catalyst, however in true we cannot expect it too much in steel industry.

著者

近藤 敏 武山 眞 大藏 隆彦

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan (ISSN:09161740)

巻号頁・発行日

vol.122, no.8, pp.386-395, 2006-08-25

参考文献数

2

被引用文献数

4 7

---

Some 400 tons of platinum group metals (PGM) are yearly produced and used mainly for auto-catalyst, jewelries and electric appliances. The annual growth rate is currently more than 4%. Main resources for PGM exist predominantly in South Africa, Russia and North America, showing that they co-exist with Ni-Cu sulphide in the range of 5-10 ppm in their ores.<BR>Meanwhile, technological developments for fuel cells are being promoted, in which PEMFC (proton exchange membrane fuel cell) should be used for vehicles and stationary power. The PEMFC needs platinum as a catalyst due to the lower reaction temperature. The imbalance between supply and demand of Pt should become one of critical paths for the PEMFC promotion, if Japanese Government target is realized.<BR>This paper describes the forecast of supply & demand of Platinum based on various researches and investigations, and self-constructed model. Supply of platinum will be short in 2030's on schedule of the Japanese Government's scenario. Political countermeasure should be applied together with resources developments in order to secure the Pt resource.

著者

杉山 務 岡田 信三

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.1124, pp.1152-1154, 1981-10-25 (Released:2011-07-13)

著者

松川 瞬 板倉 賢一 早野 明 鈴木 幸司

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.256-263, 2017-11-01 (Released:2017-11-16)

参考文献数

31

被引用文献数

1

---

LIDAR (Laser Imaging Detection and Ranging) detects a rock mass surface as a point cloud, and threedimensional configurations of the rock mass can be obtained from the point cloud. In previous studies, algorithms to estimate discontinuities from a point cloud have been developed. In those algorithms, it is necessary to determine geological parameters in advance. DiAna(Discontinuity Analysis) is a Matlab tool which was developed for geostructural analysis of rock mass discontinuities. It is a semi-automatic tool. DiAna segments a point cloud into bounding boxes to estimate the surface of a rock mass. However, an expert's skills necessary to determine the appropriate size of the bounding boxes for DiAna. We developed the VBS (Variable-Box Segmentation) algorithm to determine the appropriate box size depending on the location of the point cloud and to estimate the surface of a rock mass. The VBS algorithm consists principally of three processes: large box segmentation, small box segmentation, and merging. The small boxes are merged to obtain an appropriate box size. The surface of the rock mass is estimated using the point cloud in the box. The performance of the VBS algorithms was evaluated using point clouds obtained by a geological survey. For evaluation, we estimated reference rock mass surfaces manually using the point cloud and geological sketches by geologists. Similarities among the respective reference surfaces and the surfaces estimated using the VBS algorithm were measured. Similarities among the respective reference surfaces and the surfaces estimated using the DiAna algorithm were also measured. The similarities among them were compared using standard competition ranking. The results of comparison showed that the VBS algorithm estimated planes more accurately for the reference planes than the DiAna algorithm. Therefore, the VBS algorithm determines appropriate box sizes automatically depending on the location of the point cloud and estimates the surface appropriately.

著者

萩野 翼 富山 眞吾 五十嵐 敏文

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.137, no.2, pp.24-35, 2021-02-28 (Released:2021-02-26)

参考文献数

46

被引用文献数

2

---

This study involved a mine in Akita Prefecture, Japan, which was closed in the 1970s and from which acid mine drainage (AMD) flows directly into a nearby river. Local residents use river water downstream of the mine, at a point-of-use, for agricultural purposes. In selecting factors to be used as a contribution index, the flow rate at multiple points including tributaries, and the concentrations of dissolved ions and heavy metals, were measured periodically and their trends evaluated. The river flow rate increases with rainfall, the AMD flow increases during the snowmelt season. These two periods and the river low-flow period were selected for study. Mine drainage is acidic (pH 3.0-3.6), and comprises Mg-SO4 type water quality throughout the year, with higher concentrations of SO42-, S-Fe, Cu, and Zn than those of river water. Downstream of the mine, where the AMD merges, the concentrations of heavy metals gradually decreased with increasing distance downstream, particularly during the low-flow period. The SO42- fluxes did not change from above to below the AMD merge-point, and the heavy metals fluxes decreased after merging in the order S-Fe > Cu > Zn. As for the factors that decrease the concentration and fluxes, the possibility is considered that S-Fe has an effect of oxidizing and precipitating Fe2+ due to the increase in pH by the mixing with river water and dissolved oxygen. And Cu, Zn has an effect of adsorption accompanying the formation of surface complex of iron precipitates. The AMD contains high concentrations (320-400 mg L-1) of SO42- due to the acidification of pyrite, and no precipitation of heavy metals was observed in the stream. Since precipitation phenomena such as heavy metals are not recognized in SO42-, an index indicating the degree of impact of AMD on the water quality of the point-of-use was calculated using SO42- as a contribution ratio; CR. The CR of the AMD to water quality at the point-of-use is in the range of 2%-12%.

著者

冨永 博夫 辰已 敬

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.1, pp.2-7, 1991-01-25 (Released:2011-01-27)

参考文献数

15

被引用文献数

2

著者

黒川 晴正

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.74-80, 2018-06-30 (Released:2018-06-30)

参考文献数

11

被引用文献数

3 6

---

Sumitomo Metal Mining Co., Ltd. produces copper, precious metals and rare metals as by-products at the Toyo Copper Smelter & Refinery, and nickel and cobalt at the Niihama Nickel Refinery. Precious metals contained in the nickel ore, are also separated and refined at the Toyo Refinery after concentration. Sumitomo Metal Mining Co., Ltd. has been refining precious metals by pyrometallurgical method for 400 years. In recent years Sumitomo renewed the refining process using fully advanced hydrometallurgical technology and engineering technology developed by its own. The development circumstances of the new precious metal refining processes, constitution of the new process and the operation results of this process is discussed in this paper.

著者

冨田 新二 岡部 修平

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.137-141, 2018-10-31 (Released:2018-10-26)

参考文献数

4

被引用文献数

1

---

Coal provides about 40 % of total world primary energy supply now. Coal is one of the most available, affordable and accessible energy resources both in terms of sustainable supply as well as economy. Coal is carbon-intensive fuel and emits a significant amount of carbon dioxide to the atmosphere per unit of heat energy. So it is important to develop coal utilization technologies to minimize environmental impact, so called "Clean Coal Technology". Coal production and consumption trends in the world are changing due to fluctuations in coal prices, policies of governments of various countries, and so on.

著者

佐々木 秀顕 二宮 裕磨 岡部 徹

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.136, no.3, pp.14-24, 2020-03-31 (Released:2020-03-31)

参考文献数

170

被引用文献数

1 7

---

In the process of electrorefining of copper, application of higher current density increases the tendency of anode passivation. The passivation disrupts the sound operation of the electrorefining process, reducing the current efficiency and the quality of copper deposited on the cathode. Therefore, anode passivation should be avoided in industrial electrolytic cells. Anode passivation is attributed to the precipitation of copper sulfate, which is saturated locally in the vicinity of the anode surface. When a copper anode contains high concentrations of insoluble impurities that form slime on the anode surface, the tendency of anode passivation increases. Because e-waste often contains such elements that induce anode passivation as well as the harmful elements from the concentrate, the operation of the electrorefining process becomes difficult when the feeding ratio of secondary materials (scraps) is increased. To promote the recycling of metals and reduce energy consumpution in the process, it is essential to develop a passivationprevention technology for low-grade copper anodes. This article outlines the physicochemical basis of anode passivation and reviews earlier research with a focus on experimental techniques. Past research on anode passivation of pure Cu anodes, which was carried out to understand the precipitation of copper sulfate quantitatively, is also reviewed to explain the relationship between passivation and current density.

著者

稲野 浩行 富田 恵一 多田 達実 広吉 直樹

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.136, no.4, pp.25-32, 2020-04-30 (Released:2020-04-28)

参考文献数

33

---

Reduction melting methods to remove Pb from lead silicate glasses such as cathode ray tube funnel glass have been extensively studied. In this paper, reduction melting of a model lead glass was conducted using printed circuit board as reductant. Model lead silicate glass, viscosity reducing agent (Na2CO3), and printed circuit board were mixed and melted at 1473 K. Metal phase mainly composed of Pb was formed and settled in the melting glass residue. With increasing printed circuit board addition, the amount of metal phase increased and the concentrations of PbO remained in the glass residue decreased, indicating that addition of printed circuit board is effective to remove Pb from the Pb glass. By EDS analysis, it was confirmed that Cu, Ni and Sn are contained in the metal phase, indicating that metals in printed circuit board are recovered with Pb.

著者

飯島 幸夫

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.98, no.1136, pp.993-995, 1982-10-25 (Released:2011-07-13)

著者

田代 襄 河野 信 高桑 功

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.87, no.996, pp.161-166, 1971-03-25 (Released:2011-07-13)

参考文献数

18

---

The authors describe a series of laboratory experiments designed to investigate the influence of moisture on the spontaneous heating of coal on a quantitative basis. The experiments have shown next two conclusions.The spontaneous ignition point is found to be lowest when the moisture content is zero, and it progressively increases with the increase of the moisture content of coal.The relation between the moisture and the rate of temperature rise is expressed by the phrase that the more, the lower. The highest rate of temperature rise is shown by dry coal.

著者

亀田 郁朗

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.106, no.11, pp.648-652, 1990-10-25 (Released:2011-01-27)

参考文献数

2

著者

藤井 義明 石島 洋二 後藤 龍彦

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.14, pp.993-1000, 1995-12-25 (Released:2011-01-27)

参考文献数

16

被引用文献数

1

---

In Akabira Colliery, a decision was made to change the angle of influence for the cone-shaped shaft pillar from 60° to 80° in 1985. Mining in the former pillar areas started in 1986 and 2.2 million tons of coal was safely extracted before the mine closure in 1994.Damages have been induced in four levels along the concrete block-lined shaft having length of 680m. It was concluded through observation of lining, monitoring of displacements along the shaft axis and three dimensional elastic stress analysis that the main factors which induced the lining damages are (1) fault slips due to increase of shear stress, (2) increase of vertical stress component or decrease of minimum principal stress in the horizontal plane and (3) stress concentration around roadways connecting to the shaft.A consideration on a reasonable monitoring scheme for shaft damages was also shown.

著者

秩父地区残壁研究会

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.112, no.10, pp.665-669, 1996-09-25 (Released:2011-01-27)

被引用文献数

6 4

---

In Japan, some of limestone quarries have difficulties in development of new areas due to environmental restrictions. Cooperative development and operations at Mt. Bukoh are one of the development examples which meet environmental requirements and natural resource conservation.Mt. Bukoh of which original elevation was 1336m S.L. is located in the western part of Saitama pref. In the early days of development, each company commenced quarrying halfway up the mountain and ended up with only a small amount of mineable reserve. In order to fully exploit the whole resource and to maintain the final slope stability, it was required for the three companies to commence quarrying from top of the mountain maintaining the same operation level together with the same slope design and reforestation plan of the final slope.Owing to the geological structure, it is inevitable that a large final slope which is 2 to 3 km wide and 700 to 800m high-will be formed as quarrying progresses. Therefore it is vital for the three companies to secure slope stability for a long time in harmony with environment protection. All the data acquired through the series of surveys and studies were put into the computer and a comprehensive analysis was implemented. And a automatic survey system which monitors movement of the final slope started for measurement of distances from the station of a surveyor to various survey points on the slope.

著者

竹島 敏正

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.110, no.13, pp.1011-1016, 1994

被引用文献数

2