Regulation of Reactivity of Calcined Ultrafine Kaolin Products

被引:2
|
作者
Yin, Hui [1 ,2 ]
Liu, Huajie [1 ,2 ]
Bu, Yuhuan [1 ,2 ]
Chen, Weiqing [3 ]
Ding, Fuquan [1 ,2 ]
Lin, Wenxiang [1 ,2 ]
Zhang, Yuwei [1 ,2 ]
机构
[1] China Univ Petr East China, Key Lab Unconvent Oil & Gas Dev, Minist Educ, Qingdao 266580, Peoples R China
[2] China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Peoples R China
[3] CNPC R&D DIFC Co Ltd, Dubai 415747, U Arab Emirates
基金
中国国家自然科学基金;
关键词
kaolin; temperature of calcination; time of calcination; Si-Al ratio; thickening time; reactivity; THERMAL-TREATMENT; COMPRESSIVE STRENGTH; PHASE-TRANSFORMATION; SILICA FUME; GEOPOLYMER; METAKAOLIN; CLAY; CRYSTALLIZATION; KINETICS; ZEOLITE;
D O I
10.3390/pr12102268
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
This study explored the potential of ultrafine kaolin as a geopolymer raw material, focusing on the reactivity of calcined kaolin products and its influencing factors. Through a series of analytical techniques, including thickening experiments, particle size analysis, SEM, XRD, and FT-IR, the effects of calcination temperature, time, and Si-Al ratio were evaluated. The results indicated that calcination temperature significantly impacts reactivity, with optimal conditions found between 600 degrees C and 800 degrees C, yielding metakaolin with thickening times of 12 to 43 min. Temperatures above 900 degrees C led to the formation of low-reactivity phases like mullite. The Si-Al ratio also influenced thickening time, with durations varying from 97 min at 0.85 to 43 min at 0.9 and increasing to 157 min at 0.95. Calcination time had the smallest effect, with thickening times ranging from 10 to 25 min over 4 to 8 h. Additionally, calcination altered particle size, initially expanding due to thermal expansion and later shrinking due to lattice distortion above 700 degrees C. By adjusting these parameters, the reactivity of calcined kaolin could be tailored to suit specific needs. This research provides a theoretical foundation for metakaolin's application in construction materials and offers novel insights into geopolymer preparation.
引用
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页数:20
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