Effect of Soluble Silicates on the Solubility of Thorium(IV) Hydrous Oxide

Autor:	Philippe Bienvenu, Vladimir Peketroukhine, Hélène Capdevila, Ivan Laszak, Chantal Riglet-Martial, Veronique Calmon
Rok vydání:	2002
Předmět:	Nuclear and High Energy Physics Inorganic chemistry Oxide Thorium chemistry.chemical_element Sorption Actinide Silicate chemistry.chemical_compound Colloid Nuclear Energy and Engineering chemistry Leaching (metallurgy) Solubility Nuclear chemistry
Zdroj:	Journal of Nuclear Science and Technology. 39:516-519
ISSN:	1881-1248 0022-3131
DOI:	10.1080/00223131.2002.10875520
Popis:	The solubility of amorphous thorium hydrous oxide in 0.1M NaClO4, pH 6-12 was found to be lower than 4.3.10-11M and to increase in presence of soluble silicates. The interaction of soluble silicates with ThO2.nH2O precipitate was shown to consist of sorption and chemo-sorption of soluble silicates on the precipitate with the formation of amorphous thorium hydroxo-silicates. The formation of stable colloidal solutions of composition 10-3-10-2 M Th (TV); 0.08-0.14 M Si(IV) at pH 6-12 takes place. A solubility of 10-6-10-5 M Th(IV) was found after separation of the colloidal particles from these solutions by ultra-filtration. The observed effects of soluble silicates would result in an increase of the leaching and the migration of thorium (IV) with silicate-bearing natural waters and should be taken into account for the treatment of the neutral and alkaline radioactive wastes-pulps, containing actinides (IV) and silicates.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7877a4bb3f2dddc55763f52325e0db19 https://doi.org/10.1080/00223131.2002.10875520 Zobrazit plný text záznamu