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.

● 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
Calcite gypsum

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