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Journal of the Korean Ceramic Society 1978;15(1): 21. |
원주형으로 성형된 하동고령토의 수산화나트륨 수용액 처리에 의한 결정의 변화 |
김면섭 |
한양대 공대 화공과 |
On Crystallization of Hadong Kaolin Granulated Cylindrically Treated with Aqueous Sodium Hydroxide Solution |
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ABSTRACT |
Hadong Kaolin (Halloysite) was granulated cylindrically and treated with 1N aqueous sodium hydroxide solution for 6-48 hrs at 60-10$0^{circ}C$. The crystalling structure of surface of the products was studied by X-ray powder diffraction method. The reaction rate of halloysite to sodium A zeolite showed a gradual decrease from surface to inner layer. At the surface layer, the reaction mechanism was observed as first order consecutive reaction as follows: halloysitelongrightarrowamorphous aluminosilicatelongrightarrowsodium A zeolitelongrightarrowhydroxysodalite By applying the above reaction mechanism, the rate constants and activation energies was measured. |
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