Sungai Ringin power plant located in Kedabang Village, Sintang District of Indonesia, uses coal as its main source of energy. Chemically, coal combustion products are volatile materials, such as CO2, SO2, NO2 and H2O and non-volatile materials in the form of coal ash known as bottom ash and fly ash. During the process of coal combustion, a portion of the mineral fuses into fly ash particles, which can form crystalline phases like quartz and mullites, though the glass phase covers the aluminosilicate surface. This potentially creates detrimental impact on the environment [1]. Therefore, the problem of coal fly ash should be solved by utilizing wasted materials in order to avoid their accumulation in large amounts. Fly ash contains metal oxides with main components of SiO2 and Al2O3 with several crystal forms, such as quartz (SiO2), mullite (2SiO2.3Al2O3), hematite (α-Fe2O3) and magnetite (Fe3O4) [1]. The fly ash containing more than 85 % of SiO2 and Al2O3 can be used as a raw material of sodium silicate and synthetic aluminate [2]. A new approach widely developed for the utilization of fly ash is converting it into value-added products as zeolites [2-4]. The X-ray fluorescence (XRF) analysis shows that Sungai Ringin's fly ash contains minerals of SiO2 (about 53.26 %) and Al2O3 (about 28.13 %). So, it is reasonable to utilize it for synthesizing zeolite materials. The components of SiO2 and Al2O3 are the active side of fly ash and bottom ash, which can be used as zeolite base for removing heavy metals, phenol wastes and dye waste in waters.
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