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US 12,187,621 B2Granted
Sustainable calcium hydroxide production for green cement
AssigneeWisconsin Alumni Research Foundation
InventorsBu Wang, Raghavendra Ragipani, Robert Phillip Anex, Thatcher Wiley Root
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Abstract
A method of making a composition of matter comprising calcium hydroxide. The method includes the steps of contacting a calcium-containing molecule with an aqueous solution of a water-soluble salt having ammonium cation and a counter-anion, under conditions effective to yield a compound containing calcium and the counter-anion; and reacting the compound comprising calcium and the counter-anion with ammonia and water under conditions to yield calcium hydroxide.
Claims4
A method of making a composition of matter comprising calcium hydroxide, the method comprising:
- (a) contacting a feedstock comprising a material selected from the group consisting of crystalline, amorphous, or hydrated phases of calcium silicate, calcium aluminate, calcium aluminosilicate, and combinations thereof with an aqueous solution comprising a water-soluble salt comprising ammonium cation and a counter-anion, for a time, and at a temperature, pH, and pressure effective to yield a compound comprising calcium and the counter-anion;
- and
- (b) reacting at least a portion of the compound comprising calcium and the counter-anion with ammonia and water for a time, and at a temperature, pH, and pressure effective to yield calcium hydroxide.
Dependencies are inferred from the claim text.