Activity and Structure of Calcined Coal Gangue

武汉理工大学学报-材料科学版(英文版), 2007, 22(4): 749-753.

^1, , ^2, , ^3, , ^4,

1.College of Materials Science and Engineering, Nanjing University of Technology, Nanjing,210009,China

2.College of Materials Science and Engineering, Nanjing University of Technology, Nanjing,210009,China

3.College of Materials Science and Engineering, Nanjing University of Technology, Nanjing,210009,China

4.Department of Civil Engineering, The Hong Kong University of Science and Technology, Hong Kong, China

基金项目: 国家自然科学基金(2001CB610703) Nanjing University of Technology(Bscx200502)

Activity and Structure of Calcined Coal Gangue

GONG Chenchen ^1, , LI Dongxu ^2, , WANG Xiaojun ^3, , LI Zongjin ^4,

1.College of Materials Science and Engineering, Nanjing University of Technology, Nanjing,210009,China

2.College of Materials Science and Engineering, Nanjing University of Technology, Nanjing,210009,China

3.College of Materials Science and Engineering, Nanjing University of Technology, Nanjing,210009,China

4.Department of Civil Engineering, The Hong Kong University of Science and Technology, Hong Kong, China

Keywords： coal gangue

Coal gangue was activated by means of calcination in seven temperature ranges. Systematic research was made about activation mechanism and structural evolution. Glycerin-ethanol method, SEM, MIP and XRD were used to determine the variation of structure and activation of coal gangue during the calcination.The experimental results show that because of heat treatment in the range of calcination temperature, mineral composition and microstructure of coal gangue are changed. In addition, its activity is improved evidently. The amount of lime absorbed by the sample calcined at 700 C is 2-4 times that by uncalcined coal gangue in the course of hydration. When NaOH is added to coal gangue-lime system, hydration reaction of the system is sped up and the microstructure of hydrating samples of coal gangue is improved.

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Activity and Structure of Calcined Coal Gangue

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