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US 4,005,987 AGranted
Process for drying moist materials, particularly crystalline solids containing water of hydration
AssigneeMetallgesellschaft Aktiengesellschaft
InventorEgon Jury
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Abstract
A process for drying moist material, particularly substances containing water of crystallization, in which the material is passed in counterflow through a shaft to gases having an inlet temperature of 200.degree. to 1000.degree. C. The gas rises at a velocity of 2 to 30 m/sec. and the moist substances are introduced into the shaft in a high-density stream so that the moist materials agglomerate concurrently with the drying.
Claims2
A process for removing water of hydration from iron sulfate heptahydrate and agglomerating the resulting crystalline solid which comprises the steps of:
- A. passing a hot gas stream upwardly through a shaft at a velocity of 2 to 30 m/sec and an inlet temperature of substantially 500.degree. to 1000.degree. C,
- B. introducing particles of said crystalline solid into said shaft at an upper portion thereof,
- C. permitting said particles to descend in counterflow to said gas stream whereby said particles agglomerate while water of hydration is driven off,
- D. cooling the agglomerated material at a lower portion of said shaft below that at which said hot gas stream is introduced by treating the agglomerated material with cold air,
- E. recovering fine particles from said hot gas stream upon its emergence from said shaft, and
- F. adding the recovered fine particles to the solid introduced into said shaft.
3 more elements
Dependencies are inferred from the claim text.