Chromium: Difference between revisions
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Chromium is toxic and carcinogenic in its hexavalent state. Production of chromium metal often takes a path through (VI) to separate other materials, only to reduce it to (III) later. This makes chromium production via this path very dangerous. | Chromium is toxic and carcinogenic in its hexavalent state. Production of chromium metal often takes a path through (VI) to separate other materials, only to reduce it to (III) later. This makes chromium production via this path very dangerous. | ||
==Production== | ==Production== | ||
===Extraction | |||
See [[chromium procesing]] for details on extracting both the pure metal and its various salts from naturally occurring [[chromite]] | |||
See [[chromium procesing]] for details on extracting both the pure metal and its various salts | |||
==Purification== | ==Purification== | ||
Revision as of 21:41, 5 February 2025
| Chemical formula | {{#Chem:Cr}} |
|---|---|
| Atomic Number | 24 |
| OTP appearance | solid |
| Density(g/cc) | 7.2 |
| Melting Point(°C) | 1907 |
| Boiling Point(°C) | 2671 |
| Coefficient of Thermal Expansion(×10-6 °C-1) | 4.9 |
| NFPA 704 |  1
2
1
|
Uses
Primary
- Stainless steel
- High speed steel
- Electroplating
Secondary
- Tanning
- Cleaning glassware via chromic acid
- Combined with Nickel for heating elements
Natural Occurrence
- Elemental chromium does not occur naturally
- Iron chromium oxide ({{#Chem: FeCr2O4}}) occurrs as the mineral Chromite
- Lead chromium oxide ({{#Chem: PbCrO4}}) occurrs as the mineral Crocoite
Hazards
Chromium is toxic and carcinogenic in its hexavalent state. Production of chromium metal often takes a path through (VI) to separate other materials, only to reduce it to (III) later. This makes chromium production via this path very dangerous.
Production
===Extraction See chromium procesing for details on extracting both the pure metal and its various salts from naturally occurring chromite