Method of preparing recycled cementitious material by phosphogypsum-assisted carbon sequestration pretreatment process

US11912630B2 · kind B2 · utility

Assignee

• Hubei University of Technology · CN

Inventors

• Jin Hong Yang · Daejeon, KR
• Xiaolei Yu · Beijing, CN
• Xingyang He · Hubei, CN
• Ying Su
• Mingchao ZHANG · Nanhu, CN
• Qiang Zhang · Dalian, CN
• Zhengqi Zheng · Hubei, CN
• Hongbo Tan · Sichuan, CN

Key dates

• Filing date: May 23, 2023
• Grant date: Feb 27, 2024
• Expiry date: May 23, 2043

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P40/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention provides a method of preparing a recycled cementitious material by a phosphogypsum-assisted carbon sequestration pretreatment process. The method includes: (1) placing 100 mass parts of phosphogypsum, 1 to 2 mass parts of grinding aid, 10 to 20 mass parts of sodium-containing alkali component, 150 to 300 mass parts of zirconia balls, and 150 to 300 mass parts of water into a wet grinding tank for wet grinding. After 10 min to 30 min of wet grinding, introducing CO2 at a flow rate of 1.5 to 2.2 mass parts/min to keep a temperature of a wet grinding slurry below 40° C. When the wet grinding slurry reaches pH=10, ending the wet grinding and sieving out a wet grinding slurry; (2) mixing the wet grinding slurry with 700 to 1000 mass parts of slag and 100 to 350 mass parts of water to obtain a recycled cementitious material.