The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 07, 2023
Filed:
May. 11, 2020
Applicant:
Wisconsin Alumni Research Foundation, Madison, WI (US);
Inventors:
Bu Wang, Madison, WI (US);
Raghavendra Ragipani, Madison, WI (US);
Assignee:
Wisconsin Alumni Research Foundation, Madison, WI (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C04B 18/10 (2006.01); C04B 18/08 (2006.01); C04B 20/02 (2006.01);
U.S. Cl.
CPC ...
C04B 18/106 (2013.01); C04B 18/08 (2013.01); C04B 18/088 (2013.01); C04B 20/023 (2013.01);
Abstract
A method of reducing sulfur concentration in fly ash, flue gas desulfurization (FGD) ash, and mixtures thereof by contacting the fly ash, FGD ash, or mixtures thereof with an aqueous acidic solution, for a time, at a temperature, and at a liquid-to-solid ratio wherein the sulfur concentration within the fly ash, FGD ash, or mixture thereof is reduced to no more than 5 wt % SObased on the total weight of dry fly ash, FGD ash, or mixture thereof so treated.