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

小野寺 嘉郎

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.100, no.1152, pp.67-72, 1984-02-25 (Released:2011-07-13)

参考文献数

28

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The bloating properties of sedimentary zeolites existing enormously in Green Tuff region of our country were investigated. Pelletized bodies (9-12mm diameter) prepared from pulverized zeolites were fired in the range of 900-1350°C. Then physicochemical properties, such as specific gravity, water absorption, crushing strength etc., of the pellets were measured. Moreover, 38 mixtures prepared from mordenite tuff, silica, alumina and ferric oxide were fired in order to make clear the optimum bloating range in chemical compositions.The results obtained are summarized as follows;In many cases, air dried pellets had high crushing strength enough to permit the firing by rotary kiln. Pellets started to bloat at temperatures above 1150°C and the bloating extent increased with raising the temperature. Most of the pellets fired at higher temperature than 1100°C were impervious and their specific gravity was about 2.3-0.4. Crushing strength of the fired pelletes whose specific gravity were about 1.2-1.3 were in the range of 120-170kg, and it was about 2 times that of artificial light weight aggregates commercially produced. By the results of X-ray analysis, chemical and thermal analysis, it was guessed that a common gas-forming component in sedimentary zeolites concerning with the bloating was ferric oxide.From the firing tests of the above-mentioned mixtures, the optimum contents of silica, alumina and flux for the bloating were ascertained to be in the range of 60-70%, 10-25% and 10-20%, respectively.