Method for sulfur removal from coal fly ash
AssigneeWisconsin Alumni Research Foundation
InventorsBu Wang, Raghavendra Ragipani
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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 % SO3 based on the total weight of dry fly ash, FGD ash, or mixture thereof so treated.
Claims15
A method of reducing sulfur concentration in fly ash, flue gas desulfurization (FGD) ash, and mixtures thereof, the method comprising contacting 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 sulfur concentration within the fly ash, FGD ash, or mixture thereof is reduced to no more than 5 wt % SO3 based on total weight of dry fly ash, FGD ash, or mixture thereof so contacted.
Dependencies are inferred from the claim text.