Topic: Essays

Last updated: February 16, 2019

In this study, commercial kaolin from Kaolin (M) Bhd.

was used as the raw material for the synthesis of NaA zeolites. Kaolin was subjected to metakaolinization in order to produce a metakaolin. Later, the metakaolin was zeolitized, to produce NaA zeolites. Prior to use, the kaolin was treated with 2.5 % sodium hexametaphosphate. One kilogram of kaolin was treated with 5 L of distilled water containing 2.5 % of sodium hexametaphosphate. An IKA mechanical stirrer was used to homogenously stir the mixture at 4,000 rpm for 2 h.

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After 1 h of settling time, the supernatant was taken out and dried in an oven for 72 h. The treated kaolin was converted to metakaolin by calcined at 900 °C for 2 h in a muffle furnace. In order to obtain the desired zeolite, an alkaline hydrothermal reaction was carried out on the treated zeolite. Sodium hydroxide 2.75 M was added to the metakaolin in the ratio of 13.3 mL NaOH/g metakaolin. The mixture was thoroughly mechanically stirred (200 rpm) at 70 °C for 2 h.

The mixture was left at 60 °C in the oven for 12 h for completion of the crystallization process. After that, the zeolite was separated by vacuum filtration and was dried at 105 °C for 24 h in the oven.


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