Precipitation of Thorium or Uranium(VI) Complex Ion with Cobalt(III) or Chromium(III) Complex Cation, (II)

Precipitation of Thorium and Uranium(VI) Sulfito Complex Ions

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The precipitations of thorium and uranium(VI) sulfito complex ions with hexammine cobalt(X) chloride as the precipitant have been studied.
The orange-colored uranium(VI) precipitate obtained is [Co(NH₃)₆]₄[UO₂(SO₃)₃]₃22H₂O, which is in the form of square bipyramid, about 4 μm across in a cubic symmetry of the diamond type with a =10.40 Å It decomposes to an oxide mixture of Co₃0₄ and U₃O₈ above 850°C in the air through a sulfate mixture of CoSO₄ and UO₂SO₄.
Composition of the thorium precipitate varies with the precipitation conditions. Therefore, it is considered that the thorium precipitate contains thorium hydroxide and basic thorium sulfite.