The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 20, 2024
Filed:
May. 12, 2023
China Building Materials Academy Co., Ltd., Beijing, CN;
Wen Huang, Beijing, CN;
Yang Yu, Beijing, CN;
Min Wang, Beijing, CN;
Zhaijun Wen, Beijing, CN;
Tingting Bao, Beijing, CN;
Guang Yao, Beijing, CN;
Xin Shen, Beijing, CN;
Yun Liu, Beijing, CN;
Jing Wang, Beijing, CN;
Xianbin Wang, Beijing, CN;
Zhongcheng Ma, Beijing, CN;
Xianshu Gao, Beijing, CN;
Kunyue Zhang, Beijing, CN;
Guanbao Tang, Beijing, CN;
Suihua Guo, Beijing, CN;
Mingming Sun, Beijing, CN;
Ao Liu, Beijing, CN;
CHINA BUILDING MATERIALS ACADEMY CO., LTD., Beijing, CN;
Abstract
A method for preparing low-background cement includes: uniformly mixing a seed crystal of cement, CAF 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 CAF 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. %≤CS≤55.0 wt. %; and the high-magnesium raw material has a MgO content between 2.5 wt. % and 3.0 wt. %.