Zirconium Dioxide Chemical Properties

1. The zirconium dioxide obtained by burning zirconium dioxide hydrate or volatile oxyacid zirconium salt is white powder, insoluble in water.

ZrO₂·xH₂O ZrO₂+xH₂O;

2. The zirconium dioxide obtained by mild sintering is easier to dissolve by inorganic acid

ZrO₂+4H+=Zr₄++2H2O

The zirconium dioxide obtained by intense heat burning only dissolves in concentrated sulfuric acid and hydrofluoric acid, and the zirconium dioxide after melting and recrystallization only reacts with hydrofluoric acid;

3. Zirconium dioxide is an amphoteric oxide, which can form zirconate by eutectic with alkali, [2] but zirconate is easily hydrolyzed into ZrO₂·xH₂O and precipitates when it meets with water.

ZrO₂+2NaOH=Na₂ZrO₃+H₂O

Na.ZrO₃+H2O=ZrO₂+NaOH;