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J. Korean Ceram. Soc. > Volume 14(2); 1977 > Article
Journal of the Korean Ceramic Society 1977;14(2): 82.
국산 Kaolin의 개질에 관한 연구(Halloysite에서 Kaolinite로의 전이)
이종근, 이병하, 김성일
Studies on Transformation of Domestic Kaolin
The material used in this experiment is Ha-Dong kaolin whichis composed of almost crystallographically pure meta-halloysite. It was grinded and passed through 250 mesh and 325 mesh. It was treated with oxalic acids and EDTA which are different in concentration. The samples in conical beaker were kept in laboratory incubator at $25^{circ}C$ for a certain hours. The treated samples were stirred twice a day. The sample in the conditions as A-7 was kept in an autoclave under the pressure of 3 atmospheric. The samples suspended in each solution were kept for 1.5, 3 and 6 months. The transformation of crystals was detected by X-ray spectrometer, electron microscopy, and infrared spectrometer. The sample through 325 mesh compared with one through 250 mesh was transformed much more. It took for 6 months to transfer from halloysite to kaolinite in EDTA, and 3~4 months under 3 atms in autoclave at the same condition. In oxalic acids it took more than 6 months.
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