Physicochemistry of concentration mechanism of radioactive elements into zeolite and

放射性元素在沸石和沸石中富集机理的物理化学

基本信息

  • 批准号:
    09651027
  • 负责人:
  • 金额:
    $ 1.98万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    1997
  • 资助国家:
    日本
  • 起止时间:
    1997 至 1999
  • 项目状态:
    已结题

项目摘要

Clay and zeolite minerals are usually characterized by considerably high adsorption or absorption effect of ions. Exactly, ions and anions are concentrated into mineral by substitution of crystallographic lattice and adsorption or absorption effect on the surface of mineral grains. In the present study some starting borosilicate glasses have been treated experimentally under the hydrothermal condition of a temperature of 200℃ and a vapor pressure of 15.3MPa In particular, the glass constituent elements such as Sr, Cs, Li and B have been examined in derail with respect to chemical behavior and distribution within zeolite formed in the present experiments. The present study program was established in order to apply for the assessment of geological disposal of high-level radioactive wastes. The starting borosilicate glasses consist of the system Na-Cs-Sr-B-Li-Si-Al-O. Experimental study has been performed by hydrothermal treatment of powdered borosilicate glass. The representative mineral … More species obtained in experiments is analcime (NaAlSi206 ・ nH2O) belonging to zeolite group. Na lattice of analcime is substituted usually by Cs element The Cs-bearing and Na-free species is named as pollucite (CsAlSi2O6). Pollucite is characterized by a deficient of H20 within its crystal In addition, the chemical reaction rate tends to decrease with the increase of Cs concentration of analcime. On the contrary, B and Li contribute obviously to progress in crystallization of analcime. The lattice parameter of analcime depends on amounts of Si of 48g site of the crystal, while the parameter doesn't necessarily depend on the contents of alkali or alkali earth elements. However the analcime formed from Li-bearing boroeilicate glass shows the feature of lattice properties larger than the one from Li-free borosilicate glass. Considering the charge balance of the crystal Li has to occupy the crystallographic lattice. The analcime formed from Sr-free borosilicate glass scarcely includes B, and the analcime formed from B-free borosilicate glass contains little Sr. It is concluded that the formation of Sr-bearing analcime should need necessarily B. Less
粘土和沸石矿物通常具有相当高的离子吸附或吸收效果。确切地说,离子和阴离子是通过晶格置换和矿物颗粒表面的吸附或吸附作用而浓缩到矿物中的。在200℃、15.3MPa的水热条件下,对硼硅酸盐玻璃进行了实验处理,研究了玻璃组成元素Sr、Cs、Li和B在沸石中的化学行为和分布。本研究课题是为应用于高放废物地质处置评价而制定的。起始硼硅酸盐玻璃由系统Na-Cs-Sr-B-Li-Si-Al-O组成。对硼硅酸盐玻璃粉末进行了水热处理实验研究。代表矿物 ...更多信息 实验中得到的物相为沸石族方沸石(NaAlSi_(20)6·nH_2 O)。方沸石的Na晶格常被Cs元素取代,含Cs而不含Na的物种称为铯榴石(CsAlSi_2O_6)。铯榴石的特点是晶体内缺乏H2O,而且随着方沸石中铯浓度的增加,其化学反应速率有降低的趋势。相反,B和Li对方沸石的结晶过程有明显的促进作用。方沸石的晶格常数取决于晶体中48 g位Si的含量,而与碱金属或碱土金属的含量无关。而含锂硼硅酸盐玻璃形成的方沸石的晶格常数大于不含锂硼硅酸盐玻璃形成的方沸石。考虑到晶体的电荷平衡,Li必须占据晶格。无锶硼硅酸盐玻璃形成的方沸石中几乎不含B,无硼硼硅酸盐玻璃形成的方沸石中几乎不含Sr,含Sr方沸石的形成必须要有B。少

项目成果

期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
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专利数量(0)
Zhoping, Y. et al.: "Spatial distribution characteristics of uranium deposits"Proc. Fifth Intern. Symp. Assoc. Math. Geol.. 600-605 (1999)
周平,Y.等:“铀矿床的空间分布特征”。
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    0
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Shoji, T., et al.: "Morphology of grandite garnet synthesized in H2O-Co2 mixtures"Jour. Mineal. Petrol. Econ. Geol.. 93. 64-68 (1998)
Shoji, T. 等人:“在 H2O-Co2 混合物中合成的红榴石石榴石的形态”杂志。
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SOJI, T. and KANEDA, H.: "Ore value-tonnage diagrams for resource assessment."Nonrenewable Resources. 7(1). 25-36 (1998)
SOJI, T. 和 KANEDA, H.:“用于资源评估的矿石价值吨位图。”不可再生资源。
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    0
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SHOJI, T., OKAYA, K. ONO, S. KANEDA, H., and KOJIMA, M.: "A new system of the analytical SEM producing color images."Proc. 30th Intern Geol. Congr.. 10. 185-190 (1997)
SHOJI, T.、OKAYA、K. ONO、S. KANEDA, H. 和 KOJIMA, M.:“一种生成彩色图像的分析 SEM 的新系统。”Proc。
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    0
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KANEDA.H.and SHOJI.T.: "KANEDA.H.and SHOJI.T." Proc.33rd Intern.Symp.SITH(Societe Internationale des Techniqes Hydrothermales. 33. 230-233 (1998)
KANEDA.H. 和 SHOJI.T.:“KANEDA.H. 和 SHOJI.T.”
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KANEDA Hiroaki其他文献

KANEDA Hiroaki的其他文献

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{{ truncateString('KANEDA Hiroaki', 18)}}的其他基金

Mineral resource assessment related to global environmental problemswith energy and mineral resources in Xinjang, China
中国新疆能源矿产资源与全球环境问题相关的矿产资源评价
  • 批准号:
    17404025
  • 财政年份:
    2005
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Fundamental study of characteristics of mineral distribution and mineral resource assessment in the Southeastern part of China
东南地区矿产分布特征与矿产资源评价基础研究
  • 批准号:
    12574012
  • 财政年份:
    2000
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)

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