China Building Materials Academy Co., Ltd.

Tingting Bao

Jing Wang

Min Wang

Yang Yu

Wen Ji Huang

Mingming Sun

Guang Yao

Yun Liu

Xin Shen

Zhaijun Wen

Kunyue Zhang

Xianshu Gao

Ao Liu

Zhongcheng Ma

Guanbao Tang

Xianbin Wang

Suihua Guo

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. %.

Method for preparing low-background cement

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Beijing, China

Tingting Bao