MICROWAVE HEATING FOR GYPSUM MANUFACTURING PROCESSES
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United States of America Patent
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Issued Date -
May 5, 2016
app pub date -
Nov 3, 2015
filing date -
Nov 3, 2014
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Abstract
Methods of making calcium sulfate whiskers are provided. In one aspect, a method includes autoclaving a slurry of calcium sulfate hemihydrate and water to form calcium sulfate hemihydrate whiskers in water and microwaving the whiskers to dewater them, wherein the microwaving is effective to prevent a majority of the whiskers from reverting to a dihydrate form. In one aspect, a method includes microwaving calcium sulfate hemihydrate whiskers to form anhydrite calcium sulfate whiskers, wherein the microwaving is effective to remove a substantial amount of chemically bound water from the whiskers.
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