公开(公告)号：US12065378B2

公开(公告)日：2024-08-20

申请号：US18197028

申请日：2023-05-12

申请人： China Building Materials Academy Co., Ltd.

发明人： Wen Huang ,  Yang Yu ,  Min Wang ,  Zhaijun Wen ,  Tingting Bao ,  Guang Yao ,  Xin Shen ,  Yun Liu ,  Jing Wang ,  Xianbin Wang ,  Zhongcheng Ma ,  Xianshu Gao ,  Kunyue Zhang ,  Guanbao Tang ,  Suihua Guo ,  Mingming Sun ,  Ao Liu

IPC分类号： C04B28/14 ,  C04B7/42 ,  C04B7/44 ,  C04B14/46 ,  C04B22/06 ,  C04B40/00 ,  G21F1/04 ,  C04B111/00

CPC分类号： C04B28/14 ,  C04B7/424 ,  C04B7/44 ,  C04B14/4618 ,  C04B22/066 ,  C04B40/0042 ,  G21F1/042 ,  C04B2111/00862

摘要： 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. %.