China Building Materials Academy Co., Ltd.

2nd Assignee: China National Building Material Group Co., Ltd.

1st Assignee: China Building Materials Academy Co., Ltd.

Zhaijun Wen

Min Wang

Yang Yu

Wen Ji Huang

Guang Yao

Xin Shen

Kunyue Zhang

Jing Wang

Mingming Sun

Yun Liu

Xiaopeng An

Xianshu Gao

Xiao Zhi

Zhongcheng Ma

Ao Liu

Tingting Bao

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

A method for preparing Portland cement includes: respectively weighing iron slag, copper slag, vanadium slag, and nickel slag and grinding, to yield prefabricated iron slag, prefabricated copper slag, prefabricated vanadium slag, and prefabricated nickel slag; weighing mica and kaolinite, mixing, and grinding to obtain aluminous raw materials; evenly mixing the prefabricated iron slag and the aluminous raw materials, and calcining, to yield an iron-aluminum eutectic mineral; weighing the marble, fluorite, dolomite, and quartz, evenly mixing the marble, fluorite, dolomite, and quartz with the prefabricated copper slag, prefabricated vanadium slag, and prefabricated nickel slag to yield a first mixture; grinding the iron-aluminum eutectic mineral to yield powders, and calcining a second mixture of the first mixture and the powders, to yield the cement clinker; and cooling the cement clinker, and grinding a third mixture of the cooled cement clinker and the gypsum, to yield the Portland cement.

Method for preparing portland cement featuring early strength, low shrinkage, and low heat

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Beijing, China

Zhaijun Wen