Baddeleyite (ZrO2)
- CAS No.
- 12036-23-6
- Chemical Name:
- Baddeleyite (ZrO2)
- Synonyms
- caldasite;baddeleyite;Baddeleyite (ZrO2)
- CBNumber:
- CB1917323
- Molecular Formula:
- O2Zr
- Molecular Weight:
- 123.2228
- MDL Number:
- MOL File:
- 12036-23-6.mol
| Melting point | 2710℃ [KIR84] |
|---|---|
| Boiling point | 4300℃ [MER06] |
| Density | 5.85 [MER06] |
| Water Solubility | insoluble H2O; slightly soluble HCl, HNO3; soluble in heated mixture of 2 part H2SO4, 1 part H2O [MER06] |
| CAS DataBase Reference | 12036-23-6 |
Baddeleyite (ZrO2) Chemical Properties,Uses,Production
Chemical Properties
Zirconia occurs as the mineral baddeleyite, for instance, in a deposit around Sao Paulo, Brazil. However, these baddeleyite deposits generally contain large amounts of impurities and only about 80% ZrO2.
Chemical Properties
Black, brown, yellow to colorless; streak white, luster submetallic to vitreous to greasy. Highly resistant to chemicals.
Physical properties
Habit: tabular, crystalline.
Color: brown, colorless, black.
Diaphaneity: transparent,
translucent, opaque.
Luster: adamantine.
Streak: white.
Fracture: uneven.
Cleavage: (001).
Slightly sol. HCl, HNO3, and dil. H2SO4, sol. hot conc. H2SO4, and HF. Attacked by molten
KHSO4, NaOH, and Na2CO3.
Melting point: 2710°C.
Uses
Corrosion- and heat-resistant applications, source zirconium.
Production Methods
High purity zirconia can be obtained from baddeleyite by leaching with concentrated sulfuric acid or chlorination at high temperatures. The zirconium sulfates and chlorides thus formed are readily separated from the impurities. Zirconia also is made from zircon by electric-arc melting under reducing conditions.