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Zeolite syntheses were examined using coal fly ash, paper sludge ash, municipal waste incineration fly ash, RDF fly ash and swage sludge incineration ash as raw material. The hydrothermal reaction was performed under the following conditions; NaOH concentration of 1.5 or 2.0mol/dm3, reaction time for 3 or 5h, slurry concentration of 20wt% and reaction temperature at 393K. Properties such as structure of particle surface, cation exchange capacity, chemical composition and so on were investigated for the products synthesized from various ashes. The propriety of the raw material was also evaluated. These characterized various natures including solid-liquid separation habit, which is an important factor for designing the production equipment of zeolite.Zeolite P and hydroxysodalite could be produced from raw materials of coal fly ash and paper sludge ash in the present work. Zeolite with sufficient cation exchange capacity was synthesized from municipal waste incineration fly ash, when it was treated with water washing and acid washing in order to remove soluble or acid-soluble impurities in incineration ash. The factors affecting solid-liquid separation of zeolite owe mainly to the contents of calcium component and unburned carbon in the incineration ash. The solid-liquid separation of zeolite becomes extremely difficult when the contents of calcium component and unburned carbon exceed 30% and 10wt%, respectively. This is explaned by the phenomenon that the calcium component and unburned carbon in the incineration ashes are converted to the small floating materials with small density in alkali solution.

Evaluation of Coal Fly Ash and Incineration Ash as Raw Material for Zeolite Synthesis.