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US 2021/0198587 A1Published application
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
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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.
Claims14
A method of manufacturing a 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 high sulfur concentrations to yield a screened ash product, the screened coal ash particles being at least as big as the predetermined particle size;
- and
- reducing the size of the screened ash such that reduced size particles of the coal ash have particle sizes that meet fineness requirements set forth in American Society for Testing and Materials (ASTM) and/or American Association of State Highway and Transportation Officials (AASHTO) specifications for coal ash for use with concrete.
A method of manufacturing a 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 fractions of the coal ash with high carbon concentrations 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 such that particles are produced having particle sizes meeting fineness requirements set forth in ASTM and/or AASHTO specifications for coal ash for use on concrete.
Dependencies are inferred from the claim text.