Abstract
Zeolite NaA materials were synthesized successfully by hydrothermal method using the Jabal Nafusah kaolinite. In the first step, kaolinite [20g,125µm-particle size] has been calcined at 600 °C for 2h. confirm the transformation to the metkaolinite phase which has been detected during the calcination process in muffel funnece. As a second step, the zeolitisation experiments have been carried out under hydrothermal conditions. The metkaolinite obtained has been reacted with 200 ml of NaOH solutions of different concentrations in autoclaves /reflex at 105 °C for 2 h. The reaction product was found to be essentially sodium metakaolinate with the NaOH solution of 4 N. In third step filtration- filter the sodium metakaolinate and then dry. Prepation of sodium silicate- take 5 grams of NaOH and 5 grams of Sio2 in 25ml of distilled water, heat and stir the contents gently. Prepation of sodium aluminate - take 5 grams of NaOH and 5 grams of Al(OH)3 in 25ml of distilled water, heat and stir the contents gently mixing of sodium silicate and sodium aluminate until optimum solubility , in the fourth step-thermal-method; heat the mixture of sodium metakaolinate, sodium silicate, and sodium aluminate at 600 °c for 2 h the products obtained from the experiments have been characterized by using infrared spectroscopic, x-difraction analysis and electron microscopc methods. Zeolite NaA can be obtained from kaolinite under the conditions applied showing that a metakaolinisation can be achieved at 600 °C which is much lower than the temperatures given in the literature, 700-900 °C and also the time necessary for formation of zeolite NaA is less than that of the previous works.