著者

三村 均 福森 充 大谷 登蔵 菅野 卓治 Hitoshi MIMURA Mitsuru FUKUMORI Tozo OTANI Takuji KANNO 東北大学選鉱製錬研究所 東北大学工学部原子核工学科:(現)日本データスキル株式会社 東北大学大学院工学研究科:(現)日揮株式会社 東北大学選鉱製錬研究所

出版者

東北大學選鉱製錬研究所

雑誌

東北大學選鑛製錬研究所彙報 = Bulletin of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University (ISSN:0040876X)

巻号頁・発行日

vol.35, no.1, pp.19-26, 1979-09-22

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The distribution of cesium ion and the properties of ion exchange was studied in various kinds of zeolites, i.e. synthetic mordenite, natural mordenites and clinoptilolites. The distribution coefficients of cesium (K_<Cs>) exceeded 10^3 even in acidic region (pH~1), though the K_<Cs> values somewhat decreased with increasing acidity. The dynamic properties of ion exchange were examined by zeolite-column process and the break-through curves were obtained at different flow conditions. The break-through capacity, the total capacity and the column utilization increased with the increase in column temperature and with the decrease in the flow rate. Heat treatment resulted in an increase in the strength of zeolites, which was desirable for handling them. The zeolites heated at 300℃ and 500℃ increased in their total capacity of ion exchange of Cs and the granulated zeolites heated at 500℃ improved in its exchange rate and column utilization.

著者

三村 均 柴田 雅博 秋葉 健一

出版者

東北大学

雑誌

東北大學選鑛製錬研究所彙報 (ISSN:0040876X)

巻号頁・発行日

vol.44, no.2, pp.182-190, 1989-03-25

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The chemical stability of pollucite (CsAlSi_2O_6) has been studied under hydrothermal conditions in relation to the leachability of cesium. At room temperature, the leachability of cesium from pollucite in the neutral pH region was very low. Under hydrothermal conditions (100 and 200℃) in sodium or potassium chloride solution, cesium leached out due to an ion exchange reaction forming new phases such as analcime (NaAlSi_2O_6) and leucite (KAlSi_2O_6) through an isomorphous substitution mechanism. In the presence of calcium or magnesium chloride, the pollucite phase recrystallised with the formation of anorthite (CaAl_2Si_2O_8) and clinochlore (Mg_5Al_2Si_3O_<10>(OH)_8) at the surface of the original pollucite and with the cesium leaching into solution. (Received November 7,1988)hydrothermal stabilitypolluciteleachabilitycesiumion exchangeanalcimeleuciteisomorphous substitutionrecrystallizationanorthiteclinochlore.

著者

三村 均 山岸 功 秋葉 健一

出版者

東北大学

雑誌

東北大學選鑛製錬研究所彙報 (ISSN:0040876X)

巻号頁・発行日

vol.44, no.1, pp.1-7, 1988-09-30

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The selective removal of Cs and Sr from high-activity-level water (HALW) has been studied by the use of various zeolites. The rate of adsorption of Cs and Sr increased with a decrease in size of zeolite particles, and the adsorption reached almost 100% after 5 h and 10 h of shaking for Cs and Sr, respectively. High distribution coefficients of Cs (K_<Cs>=10^4〜10^5) were obtained in the solution/zeolite ratio (V/m) region of about 300 to 1000. The presence of sodium ion fairly affected the distribution of Cs^+ and Sr^<2+>, and K_d values decreased with increasing concentration of Na^+. While the presence of boron almost had no effect on the distribution of Cs ; high K_<Cs> values (K_<Cs>≧10^5) were obtained below 5000 ppm of boron. Distribution coefficients of Cs and Sr were also independent of the equilibrium pH in neutral and alkaline regions at the ionic strength of 0.1. The removal of Cs and Sr from simulated HALW was effectively achieved by the use of mixed zeolites, and the K_d value was 7.0×10^3ml/g at the mixing ratio of 48/52 of X/chabazite.high-activity-level watercesiumstrontiumadsorption ratedistribution coefficientboronmixing ratiomixed zeolite

著者

八嶋 三郎 荒井 豊 堀田 浩充 橋本 等

出版者

東北大學選鉱製錬研究所

雑誌

東北大學選鑛製錬研究所彙報 = Bulletin of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University (ISSN:0040876X)

巻号頁・発行日

vol.40, no.2, pp.191-198, 1985

著者

南部 松夫 岡田 広吉

出版者

東北大學選鉱製錬研究所

雑誌

東北大學選鑛製錬研究所彙報 = Bulletin of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University (ISSN:0040876X)

巻号頁・発行日

vol.19, no.1, pp.1-12, 1963-10-28

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The bedded manganese oxide deposits of Iwasaki distrct, Aomori Prefecture occur in most cases in tuffaceous sandstone of the upper Miocene age. The mother rock of these deposits is slightly affected by the hydrothermal alteration, and the ore is characterized by the mineral composition of a single manganese mineral, todorokite. The mineral is identified mainly by the X-ray powder method and chemical and differential thermal analyses. The chemical formula is (Mn^<2+>_<0.58> Ca_<0.09> Mg_<0.20> Ba_<0.04>)_<0.90> Mn^<4+>_<3.06> O_<7.00>・2.1 H_2O which agrees well with Mn^<2+>Mn_3^<4+>O_7・2-xH_2O given by L.T.Larsen in 1962.

著者

張 世波 Acuna Cesar M. 矢沢 彬

出版者

東北大学

雑誌

東北大學選鑛製錬研究所彙報 (ISSN:0040876X)

巻号頁・発行日

vol.40, no.2, pp.143-154, 1985

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Three kinds of melting experiments were carried out for investigating the equilibria between ferrite slag and matte as follows : (I) Calcium ferrite slag and copper matte were brought into equilibrium under a current of SO_2-Ar gas. This corresponds to the condition of oxidizing smelting. (II) Calcium ferrite slag, copper matte and metallic copper were brought into equilibrium under a current of Ar gas. This corresponds to the condition of reducing smelting. (III) Three liquid phases of slag, matte and copper were brought into equilibrium under a current of SO_2-Ar gas. This corresponds to the direct production of copper by oxidizing smelting. In all of these cases, the distribution behaviour of arsenic, in addition to those of the principal components, was investigated. The solidified samples were investigated by microscope and electron probe microanalyzer (EPMA) to confirm the structure and composition for each phase obtained. The following crystallites were recognized in each phase. In the metal phase : a. Matrix of copper metal containing arsenic. b. Small bluish-grey particle of Cu_2S or bornite. c. Small greenish-grey crystallite of copper arsenide. d. Small light-grey arsenide consisting of Cu-Fe-As. In the matte phase : i. Bluish-grey matrix consiting of Cu_2S and bornite solid solutions. ii. Hair-like metallic copper. iii. Tiny dark grey crystallite of CaS. iv. Round dark grey particle consisting of calcium ferrite and bornite. v. White particle of iron. vi. Round yellowish-white grain consisting of copper and arsenic. vii. Tiny grey eutectic-type grains of Cu_2O recognized under very high oxygen potential. viii. Dark grey boundary crystallites observed in low grade matte. Sulfide-oxide mixture of Fe-Ca-S-O system. In the slag phase : 1. Large dark grey plate-like crystallites of 2CaO・Fe_2O_3. 2. Large grey plate-like crystallites of FeO・Fe_2O_3・CaO. 3. Massive light grey crystallites of FeO or Fe_3O_4. 4. Tiny dark grey grains observed in calcium ferrite crystallite. 5. Light yellow crystallites of FeS. 6. Brown or bluish-grey crystallites of bornite. 7. Greenish-grey plate-like or massive crystallites. Sulfide-oxide mixture of Fe-Ca-S-O system. 8. Small metallic copper grains. 9. White spherical crystallites of Fe occasionally containing As.

著者

梅津 良昭 李 自強 徳田 昌則

出版者

東北大學選鉱製錬研究所

雑誌

東北大學選鑛製錬研究所彙報 = Bulletin of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University (ISSN:0040876X)

巻号頁・発行日

vol.47, no.1/2, pp.58-65, 1991-12-27

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Thiourea leaching of silver sulfide was studied in weakly acidic sulfate solutions containing ferric sulfate as a moderate oxidant. In the presence of ferric ions, the sulfide sulfur was converted into elemental sulfur and the silver was extracted as its thiourea complex ion, Ag(NH_2CSNH_2)_3^+. In the leaching without oxidant, silver sulfide was leached according to the H_2S forming reaction, where the elimination of H_2S from the leach liquor, for instance by nitrogen gas flow, significantly favored the leaching. In the both cases, the presence of thiourea was necessary for the extraction of silver from the sulfide. The moderate leaching conditions such as fairly low acid concentration at a level around 0.06mol/l and the operation temperature not higher than 50℃, and a high concentration of thiourea promoted the silver extraction mainly due to the increased stability of the thiourea complex ion of silver. It was also observed that silver sulfide was easily extracted in the oxidative thiourea leaching where sulfide ore consisting mainly of pyrite, arsenopyrite, stibnite and chalcopyrite coexisted.

著者

李 正吉 伊藤 公久 徳田 昌則

出版者

東北大學選鉱製錬研究所

雑誌

東北大學選鑛製錬研究所彙報 = Bulletin of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University (ISSN:0040876X)

巻号頁・発行日

vol.44, no.2, pp.237-245, 1989-03-25

著者

南部 松夫 伊藤 建三

出版者

東北大學選鉱製錬研究所

雑誌

東北大學選鑛製錬研究所彙報 = Bulletin of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University (ISSN:0040876X)

巻号頁・発行日

vol.16, no.1, pp.1-8, 1960-08-25

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The crystallization process of poorly crystallized ferric oxide formed by the dehydration of three α-type limonites obtained from different localities was studied by means of X-ray powder method. The results are as follows : 1) α-type limonite changes into a mixture of poorly crystallized hematite and amorphous ferric oxide by its thermal decomposition in the temperature range 390-405℃. These two heated products arise from crystalline goethite and amorphous ferric oxide hydrate contained respectively in original limonite. 2) Variations in the degree of crystallization of hematite changed from limonite by heating depend on the difference in the crystallinity of original goethite. 3) At low temperature from 350 to 550℃, the transformation of amorphous ferric oxide into hematite crystallite is predominent, compared with the growth of hematite crystallite. 4) The hematite crystallite formed at low temperature has a tendency of the two dimensional lattice up to about 750℃, and then grows gradually with rising temperature. 5) The crystallization process of poorly crystallized hematite and amorphous ferric oxide formed by thermal dehydration of α-type limonite may be shown as follows : [numerical formula]

著者

梅津 良昭 野坂 肇 戸沢 一光

雑誌

東北大學選鑛製錬研究所彙報 = Bulletin of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University (ISSN:0040876X)

巻号頁・発行日

vol.37, no.2, pp.223-238, 1982-03-25

著者

小野 健二 松島 知夫 大山 繁 Kenji ONO MATSUSHIMA Tomoo OYAMA Shigeru

雑誌

東北大學選鑛製錬研究所彙報 = Bulletin of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University (ISSN:0040876X)

巻号頁・発行日

vol.23, no.1, pp.25-28, 1967-11-05

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For the electrolysis of cobalt the separation of nickel from cobalt pregnant solution by precipitating nickel as nickel Nioxime was studied. The effect of the pH and temperature for the precipitation of nickel was determined. The cobalt electrolyte in the order of the magnitude of the ratio of Ni/Co=n×10^<-4> for electrolysis was obtained by the addition of Nioxime at the pH of 3 to 4 and the temperature of 20° to 80℃.

著者

芦塚 正博 大谷 正康 Masahiro ASHIZUKA Masayasu OHTANI

出版者

東北大學選鉱製錬研究所

雑誌

東北大学選鉱製錬研究所彙報 (ISSN:0040876X)

巻号頁・発行日

vol.25, no.1, pp.53-65, 1969-10

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The resistance ΔR, which exists at the electrode-electrolyte interface and is dependent to the frequency used, is an important factor to be considered besides the resistance of the solution in the conductivity measurement of the electrolyte by alternating current. The present authors discussed in detail on the source of the resistance ΔR and its effect on the electrical conductivity. The results obtained are as follows : 1) Warburg's equation, Rs=a/√<ω>, Cs=b/√<ω>, is only available to the system, in which the slagmetal interface is at equilibrium potential and the exchange current density is large. Here, Rs, Cs, and W are the resistance, capacity and the frequency in radiance per second, respectively. 2) ΔR is not directly proportional to l/√<ω> and might be attributed to the surface roughness of the solid electrode. 3) The apparent activation energy of the conductivity is clearly affected by the frequency for melts with high conductivity such as Na_2O-SiO_2 melts.

著者

三本木 貢治 Koji SANBONGI

出版者

東北大學選鉱製錬研究所

雑誌

東北大学選鉱製錬研究所彙報 (ISSN:0040876X)

巻号頁・発行日

vol.8, no.1, pp.39-46, 1952-06

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The author had already performed some investigations on the reduction equilibrium of iron oxides and proposed the reduction equilibrium diagram of Fe-C-O system. But the equilibrium on systems of Fe_3O_4-liquid oxide-CO/CO_2 mixed gas and wustite-liquid oxide-CO/CO_2 mixed gas, and the relation between oxygen pct. in liquid oxide and CO/CO_2 mixed gas had not been measured. These relations were shown by concluded lines in the diagram. Recently these equilibrium were measured by Darken and Gurry and the relations between oxygen pct. in wustite and CO/CO_2 mixed gas were clecked from the view point of the statistical thermodynamics by Takeuchi and Igaki. Referring to these results, the author corrected the reduction equilibrium diagram of Fe-C-O system, then established the reduction equilibrium diagram of Fe-H-O system by the calculation.

著者

淺野 五郎 Goro ASANO 古河鑛業足尾銅山地質鑛床

出版者

東北大学選鉱製錬研究所

雑誌

東北大學選鑛製錬研究所彙報 = Bulletin of the Research Institute of Mineral Dressing and Metallurgy, Tohoku University (ISSN:0040876X)

巻号頁・発行日

vol.6, no.1, pp.83-92, 1950-09-12

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The copper deposits of Ashio Mine occur both in rhyolite and in Paleozoic chert beds, the latter having received folding and faulting. In this essay, the writer demonstrated the intimate relation between geological structure and mineralization, in the Arikoshi syncline. Bonanzas or shoots in chert are concluded to have been formed mainly either by the metallization along the intersection lines of shear veins or along the folding axes, mainly synclinal axes, which plunge into the sufficient source of mineralizing solution.

著者

菅野 卓治 橋本 裕之 大谷 登蔵

出版者

東北大学

雑誌

東北大學選鑛製錬研究所彙報 (ISSN:0040876X)

巻号頁・発行日

vol.34, no.1, pp.53-57, 1978-09-16

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The ion-exchange properties of cesium and strontium into zeolite from sodium salt solution has been studied in zeolite A, zeolite X, zeolite Y, mordenite and clinoptilolite. The distribution of cesium into mordenite from about 1〜2 M sodium chloride and sodium hydroxide solutions is considerably larger than that into zeolite A. The distribution coefficient for 2 M solution of sodium salts was about 300. Therefore, the seperation of cesium from sodium salt solution is possible by using mordenite. The distribution of strontium into zeolites from 1〜2 M solutions of sodium chloride and sodium nitrate were in the order of zeolite A>zeolite X>zeolite Y&sime;mordenite. The distribution coefficient of 230 was obtained for 1 M solutions of sodium salts. The anion in solutions had no effect on the distribution of cesium and strontium into zeolite from sodium salt solution.

著者

堀田 浩充

出版者

東北大学

雑誌

東北大學選鑛製錬研究所彙報 (ISSN:0040876X)

巻号頁・発行日

vol.33, no.1, pp.9-14, 1977-09-30

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The details of observations of the photoconductive spectra (0.7 to 2.5 μm) for the natural pyrite crystal are described with some supplements to the experimental results of the previous report. Several sub-peaks have been observed at 77 K near the principal peak of 0.9 eV which is attributed to the interband transition. The sign of dE_G/dT is determined to be negative from the temperature-variation of the peak. Photoconductive decay of the natural pyrite crystal has been observed at 77 K with the 2 μs pulsed white light. Three different life times (τ_j) have been derived from the empirical formula, V=Σ V_jexp (-t/τ_j), which applies to the observed decay curve. Their values of τ_j are about 80 μs, 5 ms and 65 ms, respectively.

著者

石川 遼平 井上 博文 三本木 貢治

出版者

東北大学

雑誌

東北大學選鑛製錬研究所彙報 (ISSN:0040876X)

巻号頁・発行日

vol.29, no.2, pp.193-200, 1974-03-28

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The relation berween cerium and oxygen in liquid iron together with the phase of deoxidation products at 1650℃ was studied. The following results were obtained : 1) The composition of deoxidation products is considered to be that the O/Ce ratio is 1.5 to 1.64 ([%Ce]<10 ppm), 2) If the deoxidation products are assumed as Ce_2O_3,the deoxidation equilibrium constant can be expressed as below, Ce_2O_3=2 Ce__-+3 O__- K=4.0×10^<-15>, 1650℃, [%Ce]<10 ppm.