Method of sulfur dioxide removal from gaseous streams with .alpha.-hemihydrate gypsum product formation
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United States of America Patent
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May 17, 1994
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N/A
app pub date -
Dec 31, 1992
filing date -
Dec 31, 1992
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Abstract
A method is provided for removing sulfur dioxide from a hot gaseous stream while directly producing .alpha.-hemihydrate gypsum from a scrubber effluent. A portion of an aqueous scrubbing medium containing calcium and magnesium sulfite is removed from a scrubbing unit and passed to a pressurized oxidation vessel where the sulfites are contacted with an oxidizing gas at an elevated temperature to convert calcium sulfite directly to .alpha.-hemihydrate gypsum and magnesium sulfite to magnesium sulfate. The .alpha.-hemihydrate is separated from the aqueous medium removed from the pressurized oxidation vessel.
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