Published November 2002 | Version v1
Book Metadata-only

Effect of soluble silicates on the solubility of thorium (IV) hydrous oxide

Creators

  • 1. Commissariat a l'Energie Atomique, DEN/DED/SAMRA, Centre d'Etudes de Cadarache, Saint-Paul-lez-Durance Cedex (France)

Description

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 hydroxosilicates. The formation of stable colloidal solutions of composition 10-3-10-2M Th (IV); 0.08-0.14 M Si(IV) at pH 6-12 takes place. A solubility of 10-6-10-5M 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. (author)

Availability note (English)

Available from the Internet at URL https://doi.org/10.1080/00223131.2002.10875520
Part of:
Proceedings of actinide 2001 international conference

Additional details

Identifiers

DOI
10.1080/00223131.2002.10875520;

Publishing Information

Publisher
Atomic Energy Society of Japan
Imprint Place
Tokyo (Japan)
Imprint Title
Proceedings of actinide 2001 international conference
Imprint Pagination
986 p.
Journal Page Range
p. 516-519

Conference

Title
Actinide 2001 international conference
Dates
4-9 Nov 2001
Place
Hayama, Kanagawa (Japan)

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
51054695
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; S12: MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES;
Resource subtype / Literary indicator
Conference
Descriptors DEI
AMORPHOUS STATE; COLLOIDS; LEACHING; PH VALUE; RADIOACTIVE WASTE PROCESSING; RADIOACTIVE WASTES; RADIONUCLIDE MIGRATION; SILICATES; SOLUBILITY; THORIUM; THORIUM OXIDES; ULTRAFILTRATION
Descriptors DEC
ACTINIDE COMPOUNDS; ACTINIDES; CHALCOGENIDES; DISPERSIONS; DISSOLUTION; ELEMENTS; ENVIRONMENTAL TRANSPORT; FILTRATION; MANAGEMENT; MASS TRANSFER; MATERIALS; METALS; OXIDES; OXYGEN COMPOUNDS; PROCESSING; RADIOACTIVE MATERIALS; RADIOACTIVE WASTE MANAGEMENT; SEPARATION PROCESSES; SILICON COMPOUNDS; THORIUM COMPOUNDS; WASTE MANAGEMENT; WASTE PROCESSING; WASTES

Optional Information

Notes
14 refs., 3 figs.; This record replaces 34034626