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US 12,709,571 B2Granted
Production of activated-belite-CSA clinkers at extremely low firing temperature
AssigneeUniversity of Kentucky Research Foundation
InventorsTristana Duvallet, Thomas Lee Robl, Robert B. Jewell, Anne Elizabeth Oberlink
Life of this patent
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Abstract
A raw meal for a cement clinker, a cement clinker made from that raw meal and a process for producing a cement clinker are provided. The clinker contains mainly the hydraulically activate alpha′H-belite polymorph and calcium sulfoaluminate (ye'elimite or C4A3Ś), at the low firing temperature of 1050° C., using a combination of fluoride and boron oxide.
Claims14
A raw meal of a cement clinker, comprising:
- about 45-57 weight percent calcium oxide;
- about 15-25 weight percent silicon dioxide;
- about 9-18 weight percent aluminum oxide;
- about 0.5-5 weight percent iron oxide;
- about 2-8 weight percent sulfur trioxide;
- about 0.2-3 weight percent calcium fluoride;
- about 0.2-4 weight percent sodium oxide;
- and
- about 0.5-5 weight percent boron oxide wherein the raw meal is adapted to produce a cement clinker with no more than 2.4 weight percent tetracalcium aluminoferrite.
6 more elements
Dependencies are inferred from the claim text.