LOW-ALKALI ACCELERATOR AND PREPARATION METHOD

Abstract: a low-alkali accelerator and a preparation method therefor are provided. the preparation method comprises: s1, preparing a sodium metaaluminate solution; s2, adding water to the sodium metaaluminate solution, stirring same until uniform, then adding aluminum sulfate thereto, and reacting same at 50-80� c. for 0.5-1 h under stirring conditions; s3, within 10-30 min after complete reaction of the aluminum sulfate, adding, in a dropwise manner, a regulator to regulate the ph value to a neutral state; s4, mixing a strong-alkali weak-acid salt and a silicon dioxide gel until uniform, then adding same to a fluoride salt, and mixing same until uniform, to obtain a modified fluoride salt; and adding the modified fluoride salt to a neutral solution obtained in s3, and reacting same for 1-1.5 h, with the temperature maintained at 50-80� c.; and s5, adding an organic alcohol amine thereto, and stirring same for 0.5-1 h, to obtain the low-alkali accelerator.

Inventor(s): Dongdong FAN, Chunhong LIN, Zongjian ZHU, Zhiyong WANG, Hai HUANG, Zhenghui XIA, Shuangchao LI, Zhonghan WANG, Yafei ZHANG

CPC Classification: C04B14/043 (Silica-rich materials; Silicates)

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