Synthesis of Kaolinite and Transformation of Halloysite byHydrothermal Reaction

,; ,; ,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 30(1); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(1): 41.

열수반응에 의한 Kaolinite의 합성 및 Halloysite의 개질

김성규, 이화영, 오종기

한국과학기술연구원 금속재료공정연구실

Synthesis of Kaolinite and Transformation of Halloysite byHydrothermal Reaction

ABSTRACT

synthesis of artificial kaolinite and the transformation of domestic halloysite have been attempted by means of the hydrothermal treatment. The hydrothermal reaction of the mixtures of gibbsite and amorphous silica was conducted for the synthesis of kaolinite under the pressure of 125MPa at 30$0^{circ}C$ and especially the seed of kaolinite was added so as to facilitate the synthesis reaction. Domestic pink kaolin of B-grade was hydrothermally treated, in a similar way, for the transformation of crystalline form of it. Boehmite and the artificial kaolinite less than 0.4${mu}{textrm}{m}$ could be obtained through the hydrothermal reaction. It could also be found that the majority of hyalloysite was transformed into the plate-type kaolinite through the recrystallization by treating hydrothermally for a long time.