摘要
利用等离子发射光谱仪测定了7个不同温度煅烧的煤矸石在NaOH溶液和NaOH+Ca(OH)2溶液中Si4+和Al3+的溶出特性,并利用红外光谱、X射线衍射、核磁共振、扫描电镜等分析方法,研究了煤矸石、煅烧煤矸石的组成和结构以及碱溶出后煤矸石残渣的结构和形貌。结果表明:煤矸石在20℃,1mol/lNaOH溶液中经过7d溶解,Si4+和Al3+的溶出量均随煤矸石煅烧温度的变化而变化。在700℃煅烧煤矸石试样中的铝氧多面体以六配位和四配位2种形式存在且两者数量相差不大,但经碱溶蚀后,六配位铝氧多面体明显少于四配位铝氧多面体,这表明六配位铝更容易被溶出。
Coal gangues were calcined at different temperatures and their Si and Al ions dissolving-out characteristics in NaOH and NaOH-Ca(OH)2 solutions were examined by identical coupled plasma optical emission spectroscopy. After dissolving-out in alkaline solutions, changes in compositions and structures of coal gangue and calcined coal gangues, and the original structures, as well as images of the coal gangues and the calcined coal gangues were investigated by infrared spectra, X-ray diffraction, nuclear magnetic resonance, and scanning electron microscope. Results show that the ion amount of dissolving-out of Si4+ and Al3+ in 1 mol/1 NaOH solution for 7 d varies with changes of temperature. There are two kinds of Al-O polyhedrons, including hexa- and tetra-coordinate, and their contents in the calcined coal gangue samples at 700°C are similar. After dissolving-out in the alkaline solution, the amount of hexa-coordinate is much less than tetra-coordinate, hexa-coordinate is dissolved out easily.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第10期1229-1234,共6页
Journal of The Chinese Ceramic Society
基金
国家重点基础研究"973"计划(2001CB610703)资助项目。
关键词
煤矸石
煅烧
高岭石
核磁共振
氢氧化钠
Calcination
Infrared spectroscopy
Kaolin
Nuclear magnetic resonance
Quartz
Scanning electron microscopy
X ray diffraction analysis
