Uranyl hydroxide

Dihydroxidioxiuran

Fixed

Risk

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Uranyl hydroxide is a hydroxide of uranium having the chemical formula UO2 (OH) 2 in the monomers, and ( UO2 ) 2 ( OH) 4 in dimeric form. Both isomers can exist in normal aqueous medium. Uranylhydroxidhydrat is precipitated as a gelatinous yellowcake uranium from oxidized bases at around neutral pH.

Properties

Uranyl derived as the hypothetical uranates of uranium acid capable of reacting both as base and as an acid. As the base, the uranyl compounds and acid as the uranates be formed. However, the latter are not stable and are transformed into the di- uranates ( U2O72 ). The corresponding reaction equations are as follows:

On the basis of these reactions uranates and Uranylsalze can easily be converted into the other form.

Modifications

The modifications have been described with the following properties:

Use

Uranyl was previously used in the manufacture of glass and ceramics in order to color the glass phase and to produce pigments for the high temperature firing. By introducing alkaline Diuranaten in glass produces a yellow color in the glass and a green reflection. In addition, this glass can radiate ultraviolet light from cold light and fluoresces. The uranyl conducts protons when it is continuously more compressed and then expanded slowly; and it is used as a component of fuel cells.

Health effects

Uranyl mutagenic, leading to deformities and is radioactive; therefore it should be treated with extreme caution.