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US 11,807,821 B2Granted
Process for the manufacture of a mineral admixture for use in concrete products by selective sizing and milling of coal ash
AssigneeAsh Recovery Systems, Inc.
InventorRobert L. Smith
Life of this patent
Estimating the term…
Abstract
Provided are methods or preparing coal ash with acceptable concentrations of sulfur and/or carbon for using making concrete, as well as the coal ash products produced by the described methods.
Claims22
A method of manufacturing a coal ash material for use in concrete products by reducing sulfur concentration of a coal ash, the method comprising:
- selectively screening the coal ash based on a predetermined particle size to remove a portion of the coal ash with sulfur concentrations higher than a desired sulfur concentration to yield a screened ash product, particles of the screened ash product being at least as big as the predetermined particle size;
- and
- reducing the size of the particles of the screened ash product to produce the coal ash material meeting fineness requirements set forth in American Society for Testing and Materials (ASTM) specifications, American Association of State Highway and Transportation Officials (AASHTO) specifications, or both the ASTM specifications and the AASHTO specifications for coal ash for use with concrete.
A method of manufacturing a coal ash material for use in concrete products by reducing a carbon concentration of a coal ash, the method comprising:
- selectively screening the coal ash based on a predetermined particle size to remove fractions of the coal ash with carbon concentrations higher than a predetermined carbon concentration to yield a screened ash product, the fractions including particles with particle sizes at least as big as the predetermined particle size;
- and
- processing the screened ash product to produce the coal ash material meeting fineness requirements set forth in American Society for Testing and Materials (ASTM) specifications, American Association of State Highway and Transportation Officials (AASHTO) specifications, or both the ASTM specifications and the AASHTO specifications for coal ash for use with concrete.
A method of making a concrete product comprising:
- selectively screening coal ash based on a predetermined particle size to remove a portion of the coal ash with sulfur concentrations higher than a desired sulfur concentration to yield a screened ash product, particles of the screened ash product being at least as big as the predetermined particle size;
- reducing the size of the particles of the screened ash product to produce the coal ash material meeting fineness requirements set forth in American Society for Testing and Materials (ASTM) specifications, American Association of State Highway and Transportation Officials (AASHTO) specifications, or both the ASTM specifications and the AASHTO specifications for coal ash for use with concrete;
- and
- admixing the coal ash material with concrete materials, including a cementitious material, to produce the concrete product.
1 more element
A method comprising:
- selectively screening coal ash, which does not contain coal fly ash, based on a predetermined particle size to remove a portion of the coal ash with sulfur concentrations higher than a desired sulfur concentration to yield a screened ash product, particles of the screened ash product being at least as big as the predetermined particle size;
- reducing the size of the particles of the screened ash product to produce the coal ash material meeting fineness requirements set forth in American Society for Testing and Materials (ASTM) specifications, American Association of State Highway and Transportation Officials (AASHTO) specifications, or both the ASTM specifications and the AASHTO specifications for coal ash for use with concrete;
- and
- admixing the coal ash material with concrete materials, including a cementitious material, to produce a concrete product.
1 more element
A method comprising:
- selectively screening coal ash, which does not contain coal fly ash, based on a predetermined particle size to remove fractions of the coal ash with carbon concentrations higher than a predetermined carbon concentration to yield a screened ash product, the fractions including particles with particle sizes at least as big as the predetermined particle size;
- processing the screened ash product to produce the coal ash material meeting fineness requirements set forth in American Society for Testing and Materials (ASTM) specifications, American Association of State Highway and Transportation Officials (AASHTO) specifications, or both the ASTM specifications and the AASHTO specifications for coal ash for use with concrete;
- and
- admixing the coal ash material with concrete materials, including a cementitious material, to produce a concrete product.
1 more element
Dependencies are inferred from the claim text.