Investigation of the formation of uranium tetrafluoride in solution

An investigation of the system U(SO₄)₂-HF-H₂O through the solubility, optical density, and pH showed that in this system there is the successive formation of a soluble uranium fluorosulfate and sparingly soluble UF₄ · 1¹/2H₂O in cubic and monoclinic forms. Solubility data are given for the system UF₄-HF-H₂O (t = 25 °C), in which the solid phases are UF₄ · 2¹/2H₂O, UF₄, and UF₄ · 4HF.