Current Research Paper The potential use of geopolymer containing fly ash produced in heavy fuel power plants for toxic metals fixation: Chemical and physical characteristics KEYWORDS Geopolymers; Fly ash; Heavy Fuel; Vanadium; Nickel; Immobilisation. ABSTRACT In Jordan, large amounts of fly ash (FA) are produced from heavy fuel composition in power stations. The produced fly ash is highly contaminated with heavy metals including V, Ni, Zn and Fe. Geopolymer containing different amounts of FA was fabricated for sake of minimising the mobility of toxic elements in the repository site. Using local kaolinite, fly ash and NaOH mixture, five geopolymers were prepared at room temperature and cured at 80 o C at the following ratios: Si/Al: 1.684.71, Na 2 O/Al 2 O 3 : 1.481.84, Na/Al: 0.740.92. The maximum compressive strength was observed for the geopolymer containing no fly ash, 28 Mpa at day 1 and dry sample. A geopolymer containing 10% FA showed promising results where a compressive strength of 23 Mpa was reported. The porosity of FA has been partially destroyed after polymerisation process as indicated from SEM pictures and XRD analysis; new phases have been created under the action of applied pressure. The leachability test indicated that the samples of higher FA are more leachable. The results proved that involving FA in geopolymerisation was significantly decreased the mobility of the toxic metals like Ni and V. Therefore, the prepared geopolymers will definitely have important industrial applications.  2012 Trade Science Inc. - INDIA INTRODUCTION The power generation industry that based on burning petroleum fuels (like diesel) produces a solid residue which is known as fly ash (FA) [1] . In Jordan, the total consumed power during 2009 was approximately 3.44 million toes (tone oil equivalent). This amount represents 45% of the total power consumption in our Kingdom. In 2009, the total amounts of consumed fuel in power stations were 261 thousand toes (as heavy fuel oil) and Mohammad A.Al-Ghouti 1,2 *, Yahya S.Al-Degs 3 , Ayoup Ghrair 2 , Hani Khoury 4 , Mohammad Ziedan 5 1 Arts and Sciences Unit, Fahad Bin Sultan University, 15700, Tabuk, (KINGDOM OF SAUDI ARABIA) 2 Knowledge section, Royal Scientific Society P.O. Box: 1438 Amman, (JORDAN) 3 Chemistry Department, Faculty of Science, Hashemite University, Al-Zarqa, (JORDAN) 4 Earth Sciences and Environment Department, University of Jordan, Amman, (JORDAN) 5 Chemistry Department, Hussein Thermal Power Station, Al-Zarqa, (JORDAN) E-mail : Alghoutimohammad@gmail.com Received: 28 th November, 2011 ; Accepted: 3 rd January, 2012 Environmental Science An Indian Journal Trade Science Inc. Volume 7 Issue 3 ESAIJ, 7(3), 2012 [84-92] Environmental Science ISSN : 0974 - 7451