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Method for sulfur removal from coal fly ash
US2021346838A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2021346838-A1 |
| Application number | US-202016871508-A |
| Country | US |
| Kind code | A1 |
| Filing date | May 11, 2020 |
| Priority date | May 11, 2020 |
| Publication date | Nov 11, 2021 |
| Grant date | — |
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Abstract
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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 % SO 3 based on the total weight of dry fly ash, FGD ash, or mixture thereof so treated.
First claim
Opening claim text (preview).
What is claimed is: 1 . 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 % SO 3 based on total weight of dry fly ash, FGD ash, or mixture thereof so contacted. 2 . The method of claim 1 , comprising contacting the fly ash, FGD ash, or mixtures thereof with the aqueous, acidic solution at a liquid-to-solid ratio of no more than 2 liters aqueous, acidic solution per gram of fly ash, FGD ash, or mixture thereof. 3 . The method of claim 1 , comprising contacting the fly ash, FGD ash, or mixtures thereof with the aqueous, acidic solution at a liquid-to-solid ratio of no more than 1 liter aqueous, acidic solution per gram of fly ash, FGD ash, or mixture thereof. 4 . The method of claim 1 , comprising contacting the fly ash, FGD ash, or mixtures thereof with the aqueous, acidic solution at a liquid-to-solid ratio of no more than 100 mL aqueous, acidic solution per gram of fly ash, FGD ash, or mixture thereof. 5 . The method of claim 1 , comprising contacting the fly ash, FGD ash, or mixtures thereof with the aqueous, acidic solution at a liquid-to-solid ratio of no more than 50 mL aqueous, acidic solution per gram of fly ash, FGD ash, or mixture thereof. 6 . The method of claim 1 , comprising contacting the fly ash, FGD ash, or mixtures thereof with the aqueous, acidic solution at a liquid-to-solid ratio of no more than 25 mL aqueous, acidic solution per gram of fly ash, FGD ash, or mixture thereof. 7 . The method claim 1 , wherein pH of the aqueous, acidic solution is from about 2.0 to about 6.5. 8 . The method claim 1 , wherein pH of the aqueous, acidic solution is from about 4.0 to about 6.0. 9 . The method claim 1 , wherein pH of the aqueous, acidic solution is from about 4.0 to about 5.0. 10 . The method of claim 1 , wherein the aqueous acidic solution comprises carbonic acid. 11 . The method of claim 10 , wherein the fly ash, FGD ash, or mixture thereof is contacted with water in the presence of a gas phase comprising a partial pressure of carbon dioxide of from about 0.12 atm to about 10 atm. 12 . The method of claim 10 , wherein the fly ash, FGD ash, or mixture thereof is contacted with water in the presence of a gas phase comprising a partial pressure of carbon dioxide of from about 1 atm to about 5 atm. 13 . The method of claim 1 , wherein the aqueous acidic solution comprises a mineral acid. 14 . The method of claim 13 , wherein the mineral acid is selected from the group consisting of hydrochloric acid (HCl), nitric acid (HNO 3 ), phosphoric acid (H 3 PO 4 ), sulfuric acid (H 2 SO 4 ), boric acid (H 3 BO 3 ), hydrofluoric acid (HF), hydrobromic acid (HBr), and perchloric acid (HClO 4 ). 15 . The method of claim 1 , wherein the fly ash, FGD ash, or mixture thereof is contacted with the aqueous acidic solution at a liquid-to-solid ratio wherein hydrogen ion concentration ([H + ]) in the aqueous acidic solution is at least 1.95 mmol [H + ] per mole of sulfur to be washed.
Assignees
Inventors
Classifications
with carbon dioxide · CPC title
Chemical treatment · CPC title
- C04B18/106Primary
Fly ash from waste incinerators · CPC title
in high volume fly ash compositions · CPC title
Carbon dioxide · CPC title
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- What does patent US2021346838A1 cover?
- 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 % SO 3 based on the to…
- Who is the assignee on this patent?
- Wisconsin Alumni Res Found
- What technology area does this patent fall under?
- Primary CPC classification C04B18/106. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Nov 11 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).