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. |