Uranium Tungstate

When ammonium tungstate is added to a solution of uranium tetrachloride, a brownish-green precipitate of composition U(WO₄)₂.WO₃.6H₂O is obtained. This compound is used in the preparation of phosphorescent screens for use in experiments with Rontgen rays.

By the action of uranium sulphate on alkali paratungstates, complex salts of composition 12Na₂O.6UO₂.8WO₃.25H₂O, 9K₂O.6UO₂.8WO₃.34H₂O, and a corresponding ammonium salt, have been prepared. Uranvl compounds of composition UO₂.WO₄ and UO₂.WO₄.2WO₃.5H₂O are described by Lefort.