DocumentCode :
3287610
Title :
Extraction of silica and alumina from coal fly ash for the synthesis of zeolites
Author :
Kamarudin, Rose Aini ; Matlob, Abdul Salam ; Jubri, Zaemah ; Ramli, Zainab
Author_Institution :
Dept. of Eng. Sci. & Math., Univ. Tenaga Nasional, Kajang, Malaysia
fYear :
2009
fDate :
7-8 Dec. 2009
Firstpage :
456
Lastpage :
461
Abstract :
This paper reports the extraction of soluble silicates and aluminates from coal fly ash using microwave irradiation from a domestic microwave oven. Fifteen experimental conditions for the extraction were obtained using Box-Behnken design through manipulation of three variables namely sodium hydroxide (NaOH) concentration, power level of microwave irradiation and exposure time; each variable has three values. The variables with their values were; NaOH concentration (2, 4 and 6 M), exposure time to microwave irradiation (1, 3.5 and 6 min) and power level of the irradiation (10, 50 and 100 Watts). Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) was used to study the amount of silicon and aluminium in the extracts. The extracted silicates and aluminates (after the molar ratio of SiO2 to Al2O3 was adjusted to unity by adding aluminium foil) were further incubated at 95°C for 72 hours. The products isolated from the 14 experiments were characterized by their XRD images and found to be Na-A zeolites, gibbsite and sodalite octahydrate.
Keywords :
alumina; coal ash; fly ash; luminescence; microwave ovens; minerals; radiation effects; separation; silicon compounds; zeolites; Box-Behnken design; Na-A zeolites; XRD images; alumina; coal fly ash; domestic microwave oven; gibbsite; inductively coupled plasma-optical emission spectroscopy; microwave exposure time; microwave irradiation; power 10 W; power 100 W; power 50 W; silica; sodalite octahydrate; sodium hydroxide concentration; temperature 95 degC; time 1 min; time 3.5 min; time 6 min; time 72 hr; Aluminum; Crystallization; Electromagnetic heating; Fly ash; Microwave ovens; Minerals; Power engineering and energy; Silicon compounds; Solids; X-ray scattering; fly ash; microwave; silica; zeolites;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Energy and Environment, 2009. ICEE 2009. 3rd International Conference on
Conference_Location :
Malacca
Print_ISBN :
978-1-4244-5144-9
Electronic_ISBN :
978-1-4244-5145-6
Type :
conf
DOI :
10.1109/ICEENVIRON.2009.5398608
Filename :
5398608
Link To Document :
بازگشت