著者

田中 秀明 清水 文彦

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.101, no.1166, pp.267-270, 1985-04-25 (Released:2011-07-13)

著者

四元 武四郎

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.872-875, 1968-07-25 (Released:2011-07-13)

著者

永尾 勇

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.1338-1341, 1967-11-25 (Released:2011-07-13)

著者

斎藤 高正

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.955, pp.1336-1338, 1967-11-25 (Released:2011-07-13)

著者

西尾 〓次郎

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.39, no.460, pp.440-454, 1923-06-22 (Released:2011-07-13)

著者

安達 謙 仲井 雄哉 三野 翔平 宮本 真之 北田 敦 深見 一弘 邑瀬 邦明

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.136, no.2, pp.8-13, 2020-02-29 (Released:2020-02-28)

参考文献数

19

被引用文献数

3

---

The mechanism of nodulation in copper electrorefining process was investigated by experimental method and simulation, in particular as for its growth in height. Due to the high current density at the tip, the nodule height increased as an exponential function of the time for electrolysis. Therefore, the growth behavior of nodules was strongly affected by the size of the nucleus and the existence of the threshold size to lead an electrical short circuit was suggested. Since some nodules obtained in the industrial process included mold releasing agent carried from anode-casting process, mold releasing agents are considered to be one of the main causes of the large nodule and need to be removed for the improvement in the current efficiency.

著者

人見 和雄

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.956-958, 1971-11-25 (Released:2011-07-13)

著者

安井 至

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.113, no.2, pp.83-87, 1997-02-25 (Released:2011-01-27)

参考文献数

13

被引用文献数

1

著者

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.136, no.1, pp.1-7, 2020-01-31 (Released:2020-01-31)

参考文献数

26

被引用文献数

2

---

Time dependence, probability distribution, and size effect have been investigated by many researchers and are still important issues in rock engineering. These seem to be different characteristics of rock but were found to be closely related to each other through laboratory tests with rock specimens in recent studies. In this paper, the theoretical aspects on the time dependence, probability distribution, and size effect of rock strength were explained, and some of the theoretical results were compared with the previous experimental results. The theoretical formulae based on the rate process theory that represent the failure progression of rock were introduced, and their relation to the theories of visco-elasticity and visco-plasticity was described. The exact solutions of the loading-rate dependence of strength and the creep lifetime were derived from the formulae and were compared with the experimental results of andesite. In addition, the exact solutions of the probability distribution of strength and creep lifetime and their relation to the statistics of extremes were described; the exact solutions of the size effect of strength and creep lifetime and their relation to the comminution theory were also described. The authors clarified what issues have been or have not been verified in previous studies and presented the subjects of future investigation.

著者

山口 梅太郎 下谷 高灑 下村 彌太郎 安藤 行郎

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.97, no.1125, pp.1157-1162, 1981-11-25 (Released:2011-07-13)

参考文献数

4

被引用文献数

3 2

---

This is the report of the landslide happened on 20th of September, 1973 at the Kagemori limestone quarry, Saitama prefecture. The slide started at about July of 1972 and it took over one year to final slide from the first finding of the crack on the slope. This report includes the record of the displacement of crack opening observed at thecrack on the failure slope and the analitical discussion on the slide.

著者

金子 勝比古 村田 健司 柴 拓海 大見 美智人

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.103, no.1187, pp.9-15, 1987-01-25 (Released:2011-07-13)

参考文献数

12

被引用文献数

2

---

To discuss the validity of theoretical expressions, shown in eq.(1), for rock deformability obtained in the 1st report, a series of experimental studies on the elastic moduli of rock is performed.To evaluate the theoretical expressions requires the knowledge of the crack density Φ, the intrinsic elastic moduli E and ν, the frictional coefficient μ on the crack surface, and the state coefficient q. q proposed in the 1st report is the ratio of the crack density of open cracks to that of total cracks.Four kinds of granite specimens with different crack concentration were employed in experiments. Modal analysis, hydrostatic compression test, and observation of cracks on the polished surface of specimens were carried out. By analyzing these results, the crack density and the intrinsic elastic moduli of the specimen were evaluated and the theoretical values of effective elastic moduli were calculated in two cases, that q=1.0 and q=0.0, by using eq.(1). q=1.0 corresponds to the case that all pre-existing cracks are open and q=0.0 corresponds to the case of closed cracks. The former condition gives the minimum values of the elastic moduli and the latter one gives the maximum values.The tangential elastic moduli of the specimen were measured as a function of the applied stress by uniaxial compression test. The maximum. and minimum values of elastic moduli obtained experimentaly were comnared with the thenretiral vallieq Reasonable agreement was obtained (shown in Table 3 and Table 4).It is concluded that the theory proposed has a promise to estimate rock deformability quantitatively.

著者

阿部 顕

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.83, no.956, pp.1660-1664, 1967

著者

阿部 顕

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.1660-1664, 1967-12-25 (Released:2011-07-13)

著者

三宅 正男 石井 俊匡 山上 慶 平藤 哲司

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.135, no.12, pp.109-115, 2019-12-31 (Released:2019-12-26)

参考文献数

20

---

Leaching of copper anode slime using hydrochloric acid (HCl) and hydrogen peroxide (H2O2) is performed to recover Au. It is imperative to reduce the amount of the costly oxidizing agent, H2O2, used in this leaching. In conventional conditions, the Se contained in the slime is oxidized and dissolved by the leachant as well as Au. If Au alone can be selectively leached, it should reduce the use of H2O2. The calculation of equilibrium potentials showed that when the concentration of HCl is high, it is possible for Au to be selectively leached, while the dissolution of Se is suppressed. The selective leaching of Au was demonstrated by experiments using 8 mol L-1 and 12 mol L-1 HCl solutions with various amounts of added H2O2. In the selective leaching, the increase in the leaching rate of Au with increasing amounts of H2O2 diminished after the leaching rate reached 80%. This may be because Au remained inside the Se particles, and the contact between Au and the leachant was physically inhibited by the Se layer encompassing the Au atoms. However, a leaching rate of Au of greater than 95% was achieved, even when the leaching rate of Se was less than 30%. From these results, it was confirmed that the use of H2O2 can be reduced by the selective leaching of Au compared to the cases in which all Se in the slime is dissolved.

著者

白鳥 寿一 中村 崇

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.6,7, pp.325-329, 2006 (Released:2007-07-25)

参考文献数

6

被引用文献数

20

---

The condition for material recycling in our country is gradually improving. However, even the current recycling rate of base metals easier to process than rare metals, is not enough. Though several suggestions have been made to improve this situation, they could not be implemented due to restrictions caused by the legal context such as the Waste Disposal Law. Also, in many cases, recycling of materials was limited due to its high treatment costs. If this situation continues to prevail, valuable metal resources indispensable for advanced technology will be lost permanently. And the toxic metals associated with valuable metals will pollute our country gradually. In order to improve the recycling rate and to prevent the diffusion of contaminants, we propose a new system taking various aspects of metal recycling into consideration. This system is based on the concept of "artificial mineral deposit". This system is a paradigm change on the way we look at waste products, as the stockpiled recycling metal is treated as ore deposit. The new system will allow various possibilities of further metal recycling and reduce environmental impact tremendously.

著者

中田 英喜 横島 美香 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.135, no.11, pp.101-108, 2019-11-30 (Released:2019-11-28)

参考文献数

24

被引用文献数

3

---

The objective of this study was to deepen the understanding of the immobilization process of selenium (VI)contaminated soil when using immobilization agents consist of MgO and iron (II) compounds. The objective was achieved by introducing diffusion cells that allows us to physically separate soil and immobilization agent, and measuring the valence of selenium as well as the concentrations in liquid, soil, and immobilization agent phases. Experimental data showed that the addition of immobilization agents induced desorption of selenium (VI) from the contaminated soil, and the desorbed selenium (VI) was reduced into selenium (IV) by iron (II) compounds. The formed selenium (IV) was then effectively immobilized by re-sorbing on soil particles and immobilization agents. Also found was that more amount of selenium (IV) was sorbed on the immobilization agents as hydration reaction of immobilization agents proceeded. These insights obtained in this study are fundamental but important information to fully elucidate the selenium (VI) immobilization mechanisms that are required to improve the reliability of immobilization technology.

著者

高橋 良尭 山口 耕太郎 笹岡 孝司 濱中 晃弘 島田 英樹 一ノ瀬 政友 久保田 士郎 佐分利 禎

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.10, pp.94-100, 2019-10-31 (Released:2019-10-31)

参考文献数

19

---

Rock blasting is one of the most common techniques for rock breakage in the open-pit mining excavation. On the other hand, the application of the technique has been restricted by law since it may cause a serious impact on surrounding environment, such as flyrock, ground vibration and noise. According to the statistics, more than 70% of accidents relating to the usage of explosives is flyrock. This accident may cause serious damage to buildings, human beings, and objects in the surrounding area. However, a detailed guideline for prevention of flyrock has not been developed yet. From these points of views, a series of field experiments was conducted and initial velocity and flying direction of fragmented rock were discussed by considering blasting standard and rock mass conditions such as strength, fractures/cracks and joints. The result shows that powder factor and burden have strong influence on the initial velocity of fragmented rock. Not only blasting designs but also rock mass conditions, cracks/joints strongly effect on the initial velocity. In addition, it was also made clear that the existence of fractures/cracks/joints in the blasting face have an obvious impact on the direction of fragmented rock.

著者

家守 伸正 青野 貞二 黒川 晴正 伴野 睦雄

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.1191, pp.315-323, 1987-05-25 (Released:2011-07-13)

参考文献数

15

被引用文献数

3 1

---

Two adjustable parameters, namely the oxygen efficiency and the “imperfect combustion ratio” of the furnace charge, were introduced into an equilibrium calculation program developed by Goto. In order to calculate the weights of matte and slag more accurately, all the other elements which are not incorporated in Goto's program were treated as one component. The overall pyrometallurgical reaction in a copper flash smelting furnace was analyzed by the modified program.The results obtained are summarized as follows:(1) The important elemental compositions calculated for matte, slag and gas phases were in good agreement with the values of chemical analyses by setting the oxygen efficiency so that the experimental and calculated matte grades are equal.(2) In the case of the magnetite content of the slag, however, the analyzed values were much larger than the calculated ones. The re-evaluation of the activity coefficient of magnetite in slag brought a relatively good agreement although the analyzed values were still larger by about 3% than the calulated ones.(3) The measured oxygen pressures were 2 times as high as the calculated ones, and this result shows the same trend as the magnetite content of the slag. These results may imply that the magnetite and hematite which are contained in the furnace charge and/or formed in the upper zone of the reaction shaft are absorbed by the slag to a greater extent than the equilibrium content.(4) If the performance of the concentrate-burner is not adequate, the calculated temperature will be higher than the measured one. This temperature difference was explained to some extent by evaluating the “imperfect combustion ratio” of the furnace charge.

著者

宮野 久 佐藤 幸次

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.9, pp.663-666, 1993-09-25 (Released:2011-01-27)

著者

志津利 泱

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.96, no.1112, pp.731-734, 1980