Method for regenerating calcium sulfate
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United States of America Patent
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Issued Date -
Dec 9, 2004
app pub date -
Aug 5, 2004
filing date -
Sep 26, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Calcium sulfate is regenerated to lime at a relatively low temperature and in a short time. In a method of regenerating lime by reducing calcium sulfate by flowing a reducing gas containing 0.5 to 20% by volume of CO and 0.03 to 30% by volume of CO.sub.2, the reduction is carried out in the presence of an aid selected from the group consisting of Fe.sub.2O.sub.3, MgSO.sub.4 and mixtures thereof at a temperature of 900 to 1000.degree. C. In cases where the aid is Fe.sub.2O.sub.3, the amount thereof is 0.2 to 10% by weight based on the weight of the calcium sulfate in terms of anhydrous calcium sulfate. In cases where the aid is MgSO.sub.4, the amount thereof is preferably 10 to 50% by weight based on the weight of the calcium sulfate in terms of anhydrous calcium sulfate.
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