Fixation and Transport of Uranium by Humic Substances; FIXATION ET TRANSPORT DE L'URANIUM PAR LES SUBSTANCES HUMIQUES

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1962

OSTI ID:4707521

Martin, J

Thesis submitted to Universite de Paris, France. A study was made of the part taken by organic substances in ores that contain urarium in a disseminated form, without mineralization, considering the reaction between uranium and humus. Humic acids are extracted from the peat by ammonia. By the fact of their ability to cationic exchange, these form humates with metal cations; monovalent humates, normally soluble in water, can become insoluble after treatment of humic acids with methanol. The polyvalent humates are insoluble in water, especialiy humates of U (IV) and uranyl U (VI). Action of Li, Na, K, Mg, and Ca uranylcarbonates solutions on the humic acids results in the formation of humates contairing uranyl and the other cation. About 100 g of humic acids gave a fixation of no more than 38 g of uranium as uranyl. In contact with uraniferous weakly concentrated solutions, they fixed 4 to 8 g according to pH, with a yield in the extraction greater than 95%. The action of a sodium humate solution on a humate of uranyl gave a solution containing a soluble sodium and uranyl humate. The solution was precipitated at various degrees by the polyvalent cations and insoluble humic substances. In all cases, the fixation of urarium with such prepared humic acids corresponds to a chemisorption of uranyl cations. (auth)

• Research Organization: France. Commissariat a l'Energie Atomique. Centre d'Etudes Nucleaires, Fontenay-aux-Roses
• NSA Number: NSA-17-012362
• OSTI ID: 4707521
• Report Number(s): CEA-2141
• Country of Publication: France
• Language: English

Related Subjects

CHEMISTRY
HUMIC ACID
HUMUS
ORGANIC ACIDS
SOILS