کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1602433 | 1515907 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure and cementitious properties of calcined clay-containing gangue
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Microstructure and cementitious properties of calcined clay-containing gangue Microstructure and cementitious properties of calcined clay-containing gangue](/preview/png/1602433.png)
چکیده انگلیسی
To investigate the optimum calcination temperature and cementitious properties of gangue, the microstructure of clay-containing gangue calcined at different temperatures was analyzed by X-ray diffraction (XRD), infrared spectroscopy (IR), and magnetic angle spinning nuclear magnetic resonance (MAS NMR). The results show that the structure of kaolinite in the gangue sample calcined at 500°C is destroyed. The XRD spectra show the disappearance of illite at about 800°C and the formation of mullite at about 1000°C. With the increase in calcination temperature, octahedral (6-coordinated) aluminum is transformed to tetrahedral (4-coordinated) aluminum gradually. For the gangue sample calcined at 700°C, the 29Si MAS NMR sharp peak of Q4 (framework silicate-quartz) is left. Compared with kaolinite in gangue, the thermal transformed temperature of pure kaolinite is lagged. On the basis of the microstructure and cementitious properties of calcined gangue, the results can be concluded, in order to obtain metakaolinite, the optimum calcination temperature of this gangue is about 500°C, and the optimum temperature is about 700°C for activated SiO2 and Al2O3.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Minerals, Metallurgy and Materials - Volume 16, Issue 4, August 2009, Pages 482-486
Journal: International Journal of Minerals, Metallurgy and Materials - Volume 16, Issue 4, August 2009, Pages 482-486
نویسندگان
Hua-jian Li, Heng-hu Sun,