Calcite Gypsum
● Calcite Gypsum:
This isn’t a common industrial term either, but it could be referring to a natural mixture of gypsum (calcium sulfate dihydrate – CaSO4·2H2O) and calcite (calcium carbonate – CaCO3).
These minerals often occur together in geological formations.
● Calcined Gypsum:
This is a more likely possibility. Calcined gypsum is produced by heating gypsum to drive off some of the water content,
creating plaster of Paris (calcium sulfate hemihydrate – CaSO4·½H2O) or anhydrite (calcium sulfate – CaSO4).
Calcined gypsum, also known as plaster of Paris or stucco, has a wide range of applications due to its unique properties.
Here’s a breakdown of its key uses:
Construction Industry:
● Wallboard (Drywall):
The most common use. Calcined gypsum is the primary component of the core material in drywall panels,
providing fire resistance, sound insulation, and a smooth surface for finishing.
● Plaster:
Used for creating decorative moldings, cornices, and other architectural features.
It also finds use in patching and repairing walls and ceilings.
● Stucco:
A coarser form of calcined gypsum used for creating exterior finishes on buildings.
It provides a durable and weather-resistant surface.
● Fireproofing:
Due to its fire-resistant properties, calcined gypsum is used in fireproofing materials for walls, ceilings, and columns.
Other Industries:
● Molding and Casting:
Calcined gypsum is used to create molds for casting sculptures, figurines, and other decorative items.
It’s also used in dental and orthopedic applications to create casts for teeth and bones.
• Agriculture:
Small amounts of calcined gypsum can be used as a soil conditioner, particularly for soils high in sodium content.
It helps improve drainage and provide calcium for plant growth.
• Manufacturing:
Calcined gypsum finds use in various manufacturing processes, including the production of paper, paint, and glass.
It acts as a filler, binder, or retarder depending on the application.
Advantages of Calcined Gypsum:
● Versatility:
Wide range of applications in construction, manufacturing, and other industries.
● Workability:
Relatively easy to mix and apply when wet, allowing for shaping and molding.
● Setting properties:
Sets and hardens rapidly after mixing with water, providing a strong and stable material.
Fire resistance:
Provides good fire resistance, making it valuable for construction applications.
● Cost-effective:
A relatively inexpensive material compared to some alternatives.
Limitations:
● Water sensitivity:
Calcined gypsum loses strength and can deteriorate when exposed to water for extended periods.
● Limited strength:
While strong for its weight, it’s not suitable for structural applications requiring high load-bearing capacity.
Chemical specification:
92. min
| Constituents | Typical PCT |
| Crystal water | 5-7 |
| Hemi-hydrate CaSO4.1/2 H2O | |
| Insoluble residue | 1.00 max |
| Fe2O3 | 0.1 max |
| Nacl | 0.05 max |
| CaO | 37-38 |
| SO3 | 51-53 |
| Moisture | 0.00 |
Physical specification:
| Initial setting time | 8-15 minutes |
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