著者

三村 均 木村 仁宣 秋葉 健一 小野寺 嘉郎

出版者

東北大学

雑誌

東北大学素材工学研究所彙報 (ISSN:09194827)

巻号頁・発行日

vol.54, no.1, pp.1-8, 1998

被引用文献数

1

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Potassium nickel hexacyanoferrate (II) (KNiFC)-loaded silica gels were prepared by successive impregnation of macro pores with Ni(NO_3)_2 and K_4Fe(CN)_6 solutions. The loading precentage of KNiFC increased with impregnation cycles, and the KNiFC precipitates uniformly dispersed in macro pores of the matrix. The uptake of Cs^+ on KNiFC-loaded silica gels attained equilibrium within 7d at batch factor of 700(cm)^3/g, and relatively large distribution coefficients of Cs^+, K_<d.Cs>, above (10)^4(cm)^3/g, were obtained even in the presence of 5M NaNO_3. The KNiFC particles were thermally decomposed above 300℃, resulting in lowering of uptake ability for Cs^+. This exchanger proved to be effective for the selective removal of radioactive cesium from waste solutions containing highly concentrated NaNO_3.insoluble ferrocyanidespotassium nickel hexacyanoferrate (II)loadingsilica gelimpregnationmacro poreuptakeadsorptioncesiumdistribution coefficient

著者

板垣 乙未生 青木 豊松 Kimio Itagaki Toyomatsu Aoki

出版者

東北大学素材工学研究所

雑誌

東北大学素材工学研究所彙報 (ISSN:09194827)

巻号頁・発行日

vol.52, no.1, pp.1-8, 1996-12

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As a fundamental study of a new soldering system which avoids the use of a solder containing lead to protect the environment from the pollution, the heat content and the heat of eutectic reaction of the 63 mass% Sn-37 mass% Pb, 96.5Sn-3.5Ag, 42Sn-58Bi and 48Sn-52In eutectic alloys were determined in a range from 298K to the temperature which is about 30K above the eutectic point by using an adiabatic calorimeter. The obtained heat content, J_T=H_T-H_<298> (J/g), of the liquid alloys and heat of eutectic reaction, Δ_eH(J/g), are; 63Sn-37Pb : J_T=0.208T-10.0 Δ_eH=45.4 96.5Sn-3.5Ag : J_T=0.274T-27.5 Δ_eH=59.0 42Sn-58Bi : J_T=0.192T-8.0 Δ_eH=47.4 48Sn-52In : J_T=0.289T-57.1 Δ_eH=23.9

著者

伊藤 富士隆 菅原 尚生 五十嵐 章 町澤 忠一 神足 俊彦 富樫 三男 佐藤 修彰 南條 道夫

出版者

東北大学

雑誌

東北大学素材工学研究所彙報 (ISSN:09194827)

巻号頁・発行日

vol.50, no.1, pp.27-37, 1994-12

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Niobium penta-butoxide (Nb(OBu^n)_5) was synthesized from NbCl_5 in a plant scaleoperation. The content of Ta (OBu^n)_5 in Nb (OBu^n)_5 was decreased by the distillation of Nb (OBu^n)_5 using thin film down flow type molecular distillator. But the distillation method was not effective for obtaining the 4N purity Nb (OBu^n)_5 because the Nb (OBu^n)_5 was thermally unstable. Ultra fine Nb_2O_5 powder was produced by the hydrolysis of Nb (OBu^n)_5. Some physical properties of the Nb_2O_5 fine particle, such as specific surface area, mean particle size, apparant density condensation, were measured. The purity of the obtained Nb (OBu^n)_5 and the yield of niobium in the plant operation were 99.996% and 82.3%, respectively.niobiumtitaniumscrapchlorinationalkoxidationultra fine powderrecylingplant operation

著者

山村 力

出版者

東北大学

雑誌

東北大学素材工学研究所彙報 (ISSN:09194827)

巻号頁・発行日

vol.56, no.1, 2001-03-01