우리나라산 하동 kaolin （halloysite）을 과량의 1N수산나트륨수용액으로 60 ℃, 80 ℃ 및 100 ℃에서 1∼50시간 처리하여 생성된 무정형 aluminosilicate, sodium A zeolite, hydroxysodalite를 halloysite ⇬(k1)→ 무정형 aluminosilicate ⇬(k2)→ sodium A zeolite ⇬(k3)→ hydroxysodalite의 반응기구에 적용시켜 각각의 반응속도 정수를 구하였다. 또한 halloysite로부터 무정형 aluminosilicate로 되는 반응의 activation energy는 10 kcal/mol이고 무정형 aluminosilicate로부터 sodium A zeolite로 되는 경우는 16 kcal/mol이며 sodium A zeolite로부터 hydroxysodalite로 되는 경우는 7 kcal/mol임을 알았다.

Amorphous aluminosilicate, sodium A zeolite and hydroxysodalite were obtained by treating Hadong-kaolin （halloysite） with 1N aqueous sodium hydroxide solution for one to five hours and with temperature range from 60 to 100 ℃. The reaction mechanism was observed as first order consecutive reaction as follows:
halloysite ⇬（k1）→ amorphous aluminosilicate ⇬(k2)→ sodium A zeolite ⇬(k3)→ hydroxysodalite By applying the above reaction mechanism, rate constants and activation energies were measured. The activation energies of the reactions from halloysite to amorphous aluminosilicate, from amorphous aluminosilicate to sodium A zeolite, and from sodium A zeolite to hydroxysodalite were 10 kcal/mol, 16 kcal/mol, and 7 kcal/mol, respectively.