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Extração líquido-líquido de urânio(VI) do colofanito de itataia (Santa Quitéria, Ceará) por extratantes orgânicos em presença de ácido fosfórico

2008; Brazilian Chemical Society; Volume: 31; Issue: 8 Linguagem: Inglês

10.1590/s0100-40422008000800042

ISSN

1678-7064

Autores

Valeria Aparecida Leitão Ribeiro, Júlio Carlos Afonso, Glória Regina da Silva Wildhagen, José Waldemar Silva Dias da Cunha,

Tópico(s)

Radioactive element chemistry and processing

Resumo

PHOSPHORIC ACID.This work describes the liquid-liquid extraction of uranium after digestion of colofanite (a fluoroapatite) from Itataia with sulfuric acid.The experiments were run at room temperature in one stage.Among the solutions tested the highest distribution coefficient (D > 60) was found for 40%vol.DEHPA (di(2-ethyl-hexyl) phosphoric acid) + 20% vol.TOPO (trioctylphosphine oxide) in kerosene.Thorium in the raffinate was quantitatively extracted by TOPO (0.1% vol.) in cyclohexane.Uranium stripping and separation from iron was possible using 1.5 mol L -1 ammonium or sodium carbonate (room temperature, one stage).However, pH control is essential for a good separation.

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