Alpha-type calcium sulfate hemihydrate compositions and methods of making same
AssigneeG.B. Technologies, LLC
InventorsRobert Bruce, Danny Cox
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Abstract
Disclosed is an improved alpha-type calcium sulfate hemihydrate. Methods of producing an improved powdered calcium sulfate hemihydrate (CaSO4.½H2O) [alpha-type] compound are disclosed, at least one method including forming calcium sulfate dihydrate (CaSO4O.2H2O) into a briquette, calcining the briquette to transform the calcium sulfate dihydrate to calcium sulfate hemihydrate [alpha-type], drying the calcium sulfate hemihydrate [alpha-type] briquette, and optionally grinding the briquette. Also disclosed are methods of producing an improved gypsum plaster including producing the disclosed powdered calcium sulfate hemihydrate [alpha-type] and mixing the powdered calcium sulfate hemihydrate [alpha-type] with water.
Claims20
A method, comprising:
- forming calcium sulfate dihydrate (CaSO4.2H2O) into a briquette, wherein forming calcium sulfate dihydrate into a briquette includes providing an optimized combination of high pressure of formation and free water content to produce a substantially uncracked briquette that will remain substantially uncracked during calcination;
- calcining the briquette;
- transforming the calcium sulfate dihydrate briquette to a calcium sulfate hemihydrate (CaSO4.½H2O) [alpha-type] (“alpha-hemihydrate”) briquette;
- and
- drying the alpha-hemihydrate briquette.
The product of claim 28, further comprising at least one of the following:
- sand and fly ash.
A calcium sulfate hemihydrate (CaSO4.½H2O) [alpha-type] (“alpha-hemihydrate”) comprising:
- crystals of the alpha-hemihydrate that have grown together to form clusters of the crystals;
- wherein the clusters of crystals have a substantially smaller amount of pore volume between the clusters, when compared to the pore volume of alpha-hemihydrate crystals formed from dihydrate briquettes with about 0% to 12% moisture concentration.
A dry, ground calcium sulfate hemihydrate (CaSO4.½H2O) [alpha-type] (“alpha-hemihydrate”) converted from a calcined calcium sulfate dihydrate briquette;
- wherein the dry, ground alpha-hemihydrate has a water demand of less than 50 milliliters (ml) per 100 grams (g) of dry, ground alpha-hemihydrate.
Dependencies are inferred from the claim text.