著者

鶴岡 競

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.1227-1229, 1967-11-25 (Released:2011-07-13)

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

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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

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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

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

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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

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

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

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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

中村 俊男

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.708-712, 1968-07-25 (Released:2011-07-13)

著者

中野 実

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.76, no.869, pp.829-835, 1960-11-25 (Released:2011-07-13)

著者

クルチリン B. N.

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.951, pp.958-960, 1967-07-25 (Released:2011-07-13)

著者

西川 豊 大西 重吉郎 野村 幸三郎

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.69, no.784, pp.395-403, 1953-10-25 (Released:2011-07-13)

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This paper explains the general plan for coal mining by such shafts as main winding shaft (No.1 shaft), main up-cast shaft (No.2 shaft) and:blind shaft for conveying packing materials at Mitsui Sunagawa Coal Mine. The further explanations given here are those about the outline of structure of the main winding shaft, process of its sinking work, and the winding equipment.

著者

西松 裕一

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.1005, pp.920-923, 1971-11-25 (Released:2011-07-13)

参考文献数

14

著者

外尾 善次郎 小出 治彦 幡谷 敬二 文蔵 良 橋谷田 次郎 尾石 照雄 酒井 証

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.74, no.843, pp.535-552, 1958-09-25 (Released:2011-07-13)

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Underground working place in coal mine in Japan became dipper and dipper, and we can not product coal so efficiently with our mining system, so called “inclined sys em.”In order to more efficiently product coal, many people recognized, it is necessary to adapt the mining system in Europe, for instance in Germany and France, namelly so called “horizontal system”.It is said, the translation from the inclined system to horizontal system is for our coal mine in Japan very urgent and important problem.After War, many shafts were already excavated for the above mentioned purpose. As we know in Japan, many superior shaft sinking technic in Europe especially in Germany was introduced and technic in Japan was also very improved. But it is not yet so gut as in Europe. Till today many mechanization and rationalization was achieved, for instance, mechanization of loading (Adaption of Greifer) and rationalization of working system etc. Sinking speed in Japan is about 40-50m, in Europe. about 50-70m per month. In U. S. S. R, it is said, they excavated per month 241.1m.From now ono we must force to achieve the mechanization of not only loading, but bohring, walling as in U. S. S. R. and also the rationalization of working-system and cycle.

著者

西山 孝

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.88, no.1015, pp.572-575, 1972-09-25 (Released:2011-07-13)

参考文献数

4

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.80, no.919, pp.1176-1188, 1964-12-25 (Released:2011-07-13)

著者

沢田 仁 佐藤 祐治

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.95, no.1099, pp.611-615, 1979-09-25 (Released:2011-07-13)

著者

伊藤 和之

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.1159, pp.708-711, 1984-09-25 (Released:2011-07-13)

著者

会田 俊夫 石橋 重遠 佐進 進

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.78, no.887, pp.377-384, 1962-05-25 (Released:2011-07-13)

参考文献数

2

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In this paper we have studied the characteristics of the vibration of winding ropes in vertical shafts when the drums are braked in an emergency, measuring the vibration and analying the measured results by the theoretical methods published in our former paper.Some results we have obtained through our researches are as follows;1) The maximum vibration of a winding rope in a vertical shaft when the drum is braked in an emergency can safely be estimated to be 1.3 times as large as the maximum acceleration of the winding drum.2) The shock absorber is hardly effective for reducing the vibration of a winding rope in an emergency braking.3) We find that the length of a winding rope has nothing to do with its vibration in a shaft.

著者

平松 良雄 岡 行俊

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.76, no.866, pp.543-548, 1960-08-25 (Released:2011-07-13)

参考文献数

5

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For the purpose of contributing to the design of shaft linings, especially of coal mines, the authors have attempted to measure the stress in the shaft linings in several coal mines in Japan with the photoelastic apparatus contrived by them.The results show that the lining in a solid ground is generally subjected to but a low stress, but sometimes to a stress about 30kg/cm2, that in a crushed ground the lining is subjected to a medium or high stress fluctuating, and that in a loose ground there appears such an earth pressure acting on the outer surface of the lining that may be estimated by the formula of the soil pressure.