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Peptization of Thorium Hydroxide and Thorium Oxide Sols with Nitrate
Author(s) -
Wen TungJen,
Huang Theresa S. C. Chen
Publication year - 1978
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.197800006
Subject(s) - peptization , chemistry , thorium , crystallite , inorganic chemistry , calcination , nitric acid , adsorption , oxide , nuclear chemistry , hydroxide , aqueous solution , uranium , metallurgy , catalysis , materials science , organic chemistry , crystallography
The peptization of thorium hydroxide and thorium oxide sol on the preparation of microsphere of nuclear fuels are studied. These sols are prepared mainly by dispersing hydrated thorium oxide in nitric acid. A main character of ThO 2 sol is its NO 3 − /Th mole ratio. After peptization, the nitrate is presented as two forms; i. e., sorbed by particles of the sol and free in the aqueous solutions. The adsorbed NO 3 − /Th mole ratio depends on the average crystallite size of thorium oxide. In certain size range, the adsorbed NO 3 − /Th of ThO 2 sol prepared from thorium oxalate is inversely proportional to the crystallite size. The different series of thorium oxide are made by different methods. In this paper the crystallite size is obtained from 33 to 84 A by changing calcination temperatures.