Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Synthesis of A Type Zeolite from Raw Kaolin by Calcination and Hydrothermal Method and Its Modification in order to Use It Instead of Phosphate Compounds in Detergent Industries

Document Type : Research Article

Authors
Tahereh Fadaei Belkor 1
Azizullah Nejadali 1
Mahnoud Payehghadr 1
Shohreh Hasanpour 2
1 Department of Chemistry, Payame Noor University, Tehran, I.R. IRAN
2 Department of Geology, Payame Noor University, Tehran, I.R. IRAN
Abstract
The advantages of using kaolin as a source of aluminosilicate in the synthesis of zeolite for the production of catalysts, ion exchangers and adsorbents at a lower cost are known. Therefore, in this research the synthesis of type A zeolite from the source of raw kaolin aluminosilicate without any additional additives was carried out by calcining and hydrothermal methods as a non-phosphate replacement in detergents containing phosphate compounds. For this purpose, type A zeolite was synthesized using raw and natural kaolin from Masar mine in the southwest of Natanz city in Isfahan province. The samples of raw kaolin, calcined kaolin and the resulting final zeolite were analyzed by X-ray diffraction spectroscopy, scanning electron microscopy, X-ray fluorescence and atomic absorption spectroscopy. The optimal calcination temperature was 820 degrees Celsius for 1 hour, which is much lower than previous researches. Optimization of zeolite synthesis was done by hydrothermal method in different concentrations of sodium hydroxide at a temperature of 121 degrees Celsius. This synthesis was done without any additives to complete the synthesis. In the optimal conditions of this synthesis, the molar ratio of SiO2 to Al2O3 is equal to 0.7 and the molar ratio of Na2O to SiO2 is equal to 0.52 with 90% crystallization It is achieved. The reaction time was 1 hour, which is significantly less than previous studies. The synthesized zeolite is almost cubic in terms of crystallinity and has rounded edges which is a very good candidate in the formulation of powder detergents.
Keywords
Kaolin
Calcination
Zeolite
Hydrothermal
Detergent

Subjects

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