Preparation of highly pure thorium nitrate via thorium sulfate and thorium peroxide
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2000
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INTERNATIONAL CONFERENCE ON F-ELEMENTS, 4th
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A simple alternative and selective method has been proposed for the preparation of thorium nitrate using as raw material a hydrated
crystalline technical grade thorium sulfate. This salt was produced industrially [1] from the alkaline chemical processing of monazite sand
in S. Paulo. From a crude thorium hydroxide as the raw material containing uranium and rare earth elements was prepared a technical
grade thorium sulfate [Th(SO ) .9H O]. A typical analysis of this salt had shown the following composition: ThO 47–53%, R O (rare 42 2 2 23
earth oxides) 0.5–0.9%, and UO 0.01% and minor amounts of iron, titanium, phosphorus, and silicon oxides. The thorium sulfate is 3
dissolved into water and the thorium peroxide is precipitated from acidic medium by addition of hydrogen peroxide. The thorium peroxide
is filtered, washed and finally dissolved with nitric acid. Samples of the thorium peroxide were dried and fired to ThO and aliquot of the 2
thorium nitrate solution was evaporated to dryness and calcined to obtain the ThO . Both ThO have high purity (.99.5%). The content 2 2
of total rare earth elements is very low (0.23% as oxide). Uranium was not detected. The great majority of the RE is precipitated and
recovered from the filtrate by oxalic acid.
Como referenciar
ABRAO, A.; FREITAS, A.A.; CARVALHO, F.M.S. Preparation of highly pure thorium nitrate via thorium sulfate and thorium peroxide. In: INTERNATIONAL CONFERENCE ON F-ELEMENTS, 4th, Sept. 17-21, 2000, Madrid, Spain. Proceedings... DOI: 10.1016/S0925-8388(01)00998-7. Disponível em: http://repositorio.ipen.br/handle/123456789/15197. Acesso em: 22 Mar 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.