Process and apparatus for calcination of gypsum
AssigneeKnauf Gips KG
InventorsOlaf Johannsmann, Rainer Schulte, Juan Jose Ruiz
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Abstract
The invention pertains to a process for modifying gypsum, wherein a continuous feed of raw gypsum is provided; the water content of the raw gypsum is determined in the continuous feed by near infrared spectroscopy (NIR) measurement; the raw gypsum is calcined in a calcination unit at a fire rate to remove water from the raw gypsum and to obtain a continuous feed of calcined gypsum having a water content within a selected range; a water content of the calcined gypsum is determined by near infrared spectroscopy, and the fire rate is adjusted based on the water content of the raw gypsum and of the calcined gypsum. Further, the invention pertains to an apparatus for performing said process.
Claims15
Process for dehydrating gypsum, wherein
- a continuous feed of raw gypsum is provided;
- the raw gypsum is calcined in a calcination unit at a fire rate to remove water from the raw gypsum and to obtain a continuous feed of calcined gypsum having a water content within a selected range;
- a water content of the calcined gypsum is determined by near infrared spectroscopy, and
- the fire rate is adjusted based on the water content of the calcined gypsum.
Apparatus for dehydrating gypsum comprising:
- a feeder for feeding a raw gypsum to a calcination unit;
- a calcination unit for calcining the raw gypsum;
- a discharging unit for discharging calcined gypsum from the calcination unit, and
- a first NIR (Near Infrared) spectroscopy unit to determine the content of water or water of crystallization comprised in the calcined gypsum.
Dependencies are inferred from the claim text.