Process for producing cement and elemental sulfur from a flue gas desulfurization waste product
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United States of America Patent
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Jun 23, 1998
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N/A
app pub date -
Jul 28, 1997
filing date -
May 7, 1997
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Abstract
Cement and elemental sulfur are produced by forming a moist mixture of a flue gas desulfurization process waste product containing 80-95 percent by weight calcium sulfate hemihydrate and 5-20 percent by weight calcium sulfate hemihydrate, aluminum, iron, silica and carbon, agglomerating the moist mixture while drying the same to form a feedstock, and calcining the dry agglomerated feedstock in a rotary kiln. Sulfur dioxide produced during the calcination is cooled and contacted with hydrogen and carbon monoxide to reduce the same to elemental sulfur.
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