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高岭石的热稳定性和热处理产物的DTA,IR和EPR研究

INVESTIGATION OF HEAT-STABILITY AND HEAT-TREATED PRODUCTS OF KAOLINITE WITH DTA,IR,AND EPR

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【作者】 张实张惠芬

【Author】 Zhang Shi Zhang Huifeng (Guang Zhou branch, Institute of geochemistry, Academia Sinica,Guang Zhou 510640)

【机构】 中国科学院地球化学研究所广州分部中国科学院地球化学研究所广州分部 广州 510640广州 510640

【摘要】 本文利用DTA、IR和EPR等方法研究了高岭石的热稳定性及100—900℃热处理产物的系统特征。高岭石的热稳定性会因为堆垛层错缺陷浓度的增大而降低。根据IR和EPR实验,所有高岭石热处理过程中的变化包括:脱羟前、脱羟和脱羟后三个阶段。小于400℃时,产物成分和结构同原高岭石相同,≥400℃开始产物的堆垛层错浓度增大并有利于继续升温后的脱羟过程。变高岭石可能介于晶质和非晶质之间。此外,高岭石Ⅰ位Fe3+和变高岭石结构中的Fe3+可能有某些相似的特征。

【Abstract】 Heat—stability and heat-treated products throughout the temperature 100—900℃ of kaolinite have been studied with DTA, IR, and EPR. Data show that heat-stability of kaolinite decreases as the concentration of stacking faults increases. EPR and IR results indicate that heat-treating process may be described as three stages: pre-dehydro-xylation,dehydroxylation,and post-dehydroxylation stage. The products treated below 400℃ are just the same as original. kaolinite in struscture and composition. It is nearly 400℃ when stacking fault concentration in products begin to increase and this may be helpful for dehydroxylation. Investigation implies that metakaolinite may be a material between crystalline and non-crystalline. In addition,EPR spectra of a series heat-treated products in the range of 100—900℃ suggest some similarities between I site Fe of kaolinite and Fe in matekaolinite and transition kaolinite.

【关键词】 高岭石热处理产物热稳定性
【Key words】 kaoliniteheat-treated productsheat-stability
  • 【文献出处】 矿物岩石 ,Journal of Mineralogy and Petrology , 编辑部邮箱 ,1992年02期
  • 【被引频次】17
  • 【下载频次】168
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