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细度和煅烧温度对煤矸石火山灰活性及微观结构的影响
作者:曹永丹 李彦鑫 张金山 曹钊 孙春宝 
单位:内蒙古科技大学矿业研究院 内蒙古 包头 014010 
关键词:煤矸石 煅烧活化 偏高岭石 火山灰活性 微观结构 
分类号:TD849.5
出版年,卷(期):页码:2017,45(8):0-0
DOI:
摘要:

 通过化学吸钙量和水泥胶砂力学强度测试,研究了煅烧温度及细度对煅烧煤矸石火山灰活性的影响,并结合X射线衍射、红外光谱、扫描电镜和热重测试,研究了煤矸石不同煅烧温度下矿物组成、化学结构及表面形貌发生的变化。结果表明:细度和煅烧温度都会对煅烧煤矸石火山灰活性产生影响,粒度越细煅烧煤矸石的火山灰活性越大,最佳煅烧温度为800 ℃左右;500 ℃煅烧时煤矸石中高岭石开始发生脱羟基反应,其层状结构逐渐被破坏;600~800 ℃煅烧时高岭石完全转变为多孔无序、非晶结构的偏高岭石;煅烧至1 000 ℃时偏高岭石转化为晶态的莫来石和方石英,使煅烧煤矸石无序度变差、火山灰活性变弱。

 

 The effects of calcination temperature and fineness on the pozzolanic activity of calcined coal gangue were investigated via chemical calcium absorption amount tests and mechanical strength measurement of cement mortar. The mineral composition, chemical structure and topography of coal gangue were analyzed by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectrometry and thermogravimetry analysis-differential scanning calorimetry, respectively. The result show that the fineness and calcination temperature both affect the pozzolanic activity of calcined coal gangue, and the pozzolanic activity increases with the fineness. The optimal calcination temperature is 800 ℃. The dehydroxylation of kaolinite begins when coal gangue is calcined at 500 ℃, which gradually destroys the lamellar structure of kaolinite. Kaolinite completely transforms into porous and disorderly, amorphous structural metakaolinite when calcination temperature is from 600 ℃ to 800 ℃. When calcined at 1 000 ℃ metakaolinite transforms into crystalline mullite and cristobalite, decreasing the disorder degree and pozzolanic activity of calcined coal gangue.

 
基金项目:
内蒙古自然科学基金(2017MS(LH)0521));国家自然科学基金(51464037);内蒙古科技大学创新基金(2016XYPYL01)
作者简介:
曹永丹(1986—),女,讲师,博士研究生。
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