Method for ammonium-enhanced flue gas desulfurization by using red mud slurry

US11535572B2 · kind B2 · utility

Assignee

• Kunming University of Science and Technology · CN

Inventors

• Ping Ning · Kunming, CN
• Senlin Tian · Longchuan, CN
• Jianhong Huang · Kunming, CN
• Qin Zhang · Beijing, CN
• Xuewei Hu · Longchuan, CN
• Bin Li · Beijing, CN

Key dates

• Filing date: Mar 17, 2020
• Grant date: Dec 27, 2022
• Expiry date: Jul 23, 2041

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/40
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention discloses a method for ammonium-enhanced flue gas desulfurization (FGD) by using red mud slurry. The method specifically includes: crushing red mud, sieving the crushed red mud, slurrying the red mud, conducting aeration treatment, adding an ammonium salt and/or ammonia, and conducting natural sedimentation to obtain pretreated red mud slurry and pretreated red mud liquor; adding an ammonium salt and/or ammonia to the slurry, adding water and conducting uniform mixing, conducting pre-FGD, conducting deep desulfurization on treated flue gas by using the pretreated red mud liquor, and directly discharging desulfurized flue gas; and charging the pretreated red mud slurry and the pretreated red mud liquor obtained after the treatment to a replacement tank below, adding lime milk to the replacement tank, conducting stirring and natural sedimentation, conducting soilization on subnatant thick red mud slurry, and refluxing the supernatant to a red mud aeration tank.