煅烧温度对高岭石结构及电绝缘性能的影响  

Influences of Temperature on the Structure of Kaolinite and Its Electric Insulation Properties

作　　者：许红亮[1] 刘钦甫[2] 丁述理[2] 

机构地区：[1]同济大学材料科学与工程学院 [2]中国矿业大学资源与安全工程学院,北京100083

出　　处：《中国矿业大学学报》2003年第3期332-335,共4页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目 ( 4 0 0 72 0 18) ;高等学校优秀青年教师教学科研奖励计划项目

摘　　要：对大同矿区太原组 8号煤层底板的高岭土进行了煅烧实验 ,并做了 X射线衍射 ( XRD)、红外光谱 ( IR)测试 .结果表明 :煅烧温度对高岭土中高岭石的结构及性能影响很大 .5 0 0℃前煅烧时高岭石晶体结构未受破坏或影响较小 ,60 0℃时高岭石脱除大量羟基而解体为 Si- O四面体片和 Al- O八面体片 ,且随煅烧温度的升高 ,高岭石晶体结构解体加剧 .95 0℃时生成无定形 Si O2和 γ- Al2 O3 ,以及少量的 Al- Si尖晶石相及其过渡相 .煅烧高岭土的理化性能随煅烧温度而异 ,用 5 0 0℃煅烧高岭土填充电缆绝缘橡胶时 ,击穿电压等指标最高 ,电绝缘性能最好 .Raw kaolin from the bottom of coal seam No.8 in Taiyuan Formation of Datong mine district was calcined and tested by means of XRD and IR . The result shows that the calcinating temperature has a great influence on the structure and properties of kaolinite. The crystal structure of kaolinite is not or slightly damaged when calcined at 500℃, but it begin to break into Si-O tetrahedron and Al-O octahedron and to lose much hydroxyl at a temperature of above 600℃. The decomposition of kaolinite structure will be intensified with the increasing temperature. Amorphous SiO 2 ,γ Al 2O 3, a little Al-Si spinel and some transition phases are formed at 950℃. The electric properties of calcined kaolin changes with the calcination temperature. The best insulation property of wire cable rubber, such as broken voltage, can be obtained when it is filled with kaolin calcined at 500℃.

关 键 词：煅烧温度 高岭石 结构 电绝缘性能 X射线衍射 红外光谱 晶体结构 深加工利用 

分 类 号：TD973.2[矿业工程—选矿]