Submerged combustion calcination

Details Submerged combustion calcination Submerged combustion calcination

1986-11-04

1988-05-17

Sneed, Helen M. S.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423555, 106109, C04B 11036

Patent

active

047449616

ABSTRACT:
Gypsum is calcined by contacting it with the hot gases spewing out of a combustion tube submerged in the mass of gypsum. The formation of dead-burned anhydrite is reduced by surrounding the combustion tube with a second tube called a draft tube. Gypsum passing through the annulus between the tubes is heated by the hot gases and is ejected from the annulus to prevent repeated excursions into the hot gas zone at the muzzle of the combustion tube.

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