Gypsum Calcination Plant
|Minimum Order Quantity||1 Unit|
|Power Source||Hydraulic, Diesel|
|Capacity||3 lakh - 15 Million Sq. meter per annum|
|Automatic Grade||Manual, Semi-Automatic, Automatic|
|Certification||ISO 9001: 2008|
|Capacity (products per hour)||Annual Capaicty 2 to 30 Million Sq.m/year|
|Size||Length:2400mm-3600mm, Width: 900mm-1220mm,Thickness: 9.5mm-15mm|
To produce gypsum board, calcined gypsum is mixed with water and additives to form a slurry which is fed between continuous layers of paper on a board machine. As the board moves down a conveyer line, the calcium sulfate recrystallizes or rehydrates, reverting to its original rock state. The paper becomes chemically and mechanically bonded to the core. The board is then cut to length and conveyed through dryers to remove any free moisture.
Gypsum manufacturers also rely increasingly on "synthetic" gypsum as an effective alternative to natural gypsum ore. Synthetic gypsum is a byproduct primarily from the desulfurization of the flue gases in fossil-fueled power plants.
Gypsum board, drywall or plasterboard is a building product used in modern construction for efficient, cost effective fire protection that can be easily installed and decorated. The process to produce gypsum board generally consists of calcining and or grinding gypsum powder, forming a gypsum panel product and drying off excess water.
ABOUT GYPSUM CALCINATION - PROCESS
Gypsum Consists Of A Matrix Of Interlocking Elongated Crystals Solid Gypsum And Gypsum Rock Is Calcium Sulphate Dihydrate, Caso4.2h2o, Produced From Dehydration And Re-hydration Of A Mineral Crystal. The Two Water Molecules Are Chemically Bound with Calcium Sulphate In An Orthorhombic Crystalline Mineral Structure. Calcium sulphate Hemihydrate, Caso4.1/2h2o, Is Produced When Dihydrate Is Heated Driving Off The Chemically Bound Water Out Of The Gypsum Rock In A Process Called Calcining.
The Dehydration Reaction, Also Known As Calcination, Is An Endothermic Decomposition Reaction Which Occurs Between 100oc And 120oc. When Gypsum Is Heated In A Fire, The Dehydration Follows The Reaction As Solid Gypsum Starts To Degrade, Loses Its Strength And Is Eventually Transformed Back To The Powdery Material Of Calcium Sulphate Hemihydrate.
The Reaction Is Reversed To Become A Hydration Reaction When The Powder Is Mixed With Water And Formed Into Flat Sheets Of Gypsum Plaster. The Hydration Reaction Is Resulting Gypsum Contains Approximately 21% Water Content And About 79% Calcium Sulphate, Which Is Inert Below A Temperature Of 225 – 1100˚c (Goncalves Et Al 1996). The Bound Crystalline Moisture Content Plays A Significant Role In The Excellent Fire-resisting Behavior Of Gypsum Plasterboard. It Is Found That Approximately 3% Free Water Is Contained Inside Gypsum Plaster, Depending On The Ambient Temperature And Relative Humidity.
In Order To Evaporate The Free Water And Create The Chemical Change Which Releases The Chemically Bound Water In Crystal Structure, A Large Amount Of Energy Is Required. If The Reaction In Equation Calcium Sulphate Hemihydrate Is Heated To Higher Temperature, Complete Dehydration Occurs.Download Now