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US 7,824,490 B2Granted
Calcium sulfate hemihydrate treatment process
AssigneeThe Nugyp Corp.
InventorsRobert Byron Bruce, Mark Richard Flumiani, Charles E. Blow
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Abstract
A process for treating beta calcium sulfate hemihydrate is disclosed. The process comprises exposing beta calcium sulfate hemihydrate to steam at a pressure above atmospheric pressure.
Claims42
A process for treating beta calcium sulfate hemihydrate comprising:
- a. providing the beta calcium sulfate hemihydrate to a pressure chamber;
- b. after step a., closing the pressure chamber;
- c. with the pressure chamber closed, providing steam to the pressure chamber to pressurize the pressure chamber to a pressure of at least 10 psig and to expose the beta calcium sulfate hemihydrate to the steam;
- and
- d. after step c., releasing the pressure in the pressure chamber.
2 more elements
A process for treating beta calcium sulfate hemihydrate comprising:
- a. providing a quantity of beta calcium sulfate to a pressure chamber at a temperature of between 120° C. and 190° C.;
- b. providing steam at a temperature of between 115° C. and 195° C. to the pressure chamber to reach a pressure of between 10 psig and 200 psig in the pressure chamber;
- and
- c. maintaining the pressure in the pressure chamber at between 10 psig and 200 psig for between 5 and 900 seconds.
1 more element
Dependencies are inferred from the claim text.