Method for preparing low-background cement

US12065378B2 · kind B2 · utility

Assignee

• China Building Materials Academy Co., Ltd. · CN

Inventors

• Wen Huang · Gongguan, TW
• Yang Yu · Beijing, CN
• Min Wang
• Zhaijun Wen · Chengdu, CN
• Tingting Bao · Hefei, CN
• Guang Yao · Chengdu, CN
• Xin Shen · Beijing, CN
• Yun Liu · Nanhu, CN
• Jing Wang · Beijing, CN
• Xianbin Wang · London, CA
• Zhongcheng Ma · Beijing, CN
• Xianshu Gao · Chengdu, CN
• Kunyue Zhang · Beijing, CN
• Guanbao Tang · Beijing, CN
• Suihua Guo · Beijing, CN
• Mingming Sun · Beijing, CN
• Ao Liu · Beijing, CN

Key dates

• Filing date: May 12, 2023
• Grant date: Aug 20, 2024
• Expiry date: May 12, 2043

Classification

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

Abstract

A method for preparing low-background cement includes: uniformly mixing a seed crystal of cement, C4AF whiskers, and high-magnesium raw material to yield a first mixture, calcining the first mixture at 1400-1500° C., to yield a low-background clinker, the first mixture including 1.0-5.0 wt. % of the seed crystal of cement, 1.0-5.0 wt. % of the C4AF whiskers, and the balance is the high-magnesium raw material; and grinding a second mixture of the low-background clinker and gypsum, to yield low-background cement. The seed crystal of cement is a high-magnesium and low hydration heat clinker, has a specific activity of Ra-226 radioactive nuclides within 50 Bq/kg, and the MgO content of the clinker is between 4.0 wt. % and 5.0 wt. %, with 50 wt. %≤C3S≤55.0 wt. %; and the high-magnesium raw material has a MgO content between 2.5 wt. % and 3.0 wt. %.