TY - JOUR
T1 - Characterization and utilization of fly ash of heavy fuel oil generated in power stations
AU - Al-Degs, Yahya S.
AU - Ghrir, Ayoub
AU - Khoury, Hani
AU - Walker, Gavin M.
AU - Sunjuk, Mahmoud
AU - Al-Ghouti, Mohammad A.
PY - 2014/7
Y1 - 2014/7
N2 - Unlike coal fly ash, fly ash of heavy fuel oil has received much less attention in the literature. In this work, detailed physicochemical characterization of heavy fuel oil fly ash (FA) is provided. The ash has a carbonaceous matrix and contains V, Ni, Zn, Cr, Cu, and Pb with variable amounts. V was the most abundant heavy metal with enrichment factor of 277 in the FA. The presence of V in the FA is attributed to the formation of Mg 3V2O8 oxides at high combustion temperature as confirmed by XRD. Particle size distribution showed that the mean particle diameter of the FA was 70.5 μm. Extraction recovery up to 85% of metals was achieved using 1.0 M HNO3 and at room temperature. Standard metal-leaching tests confirmed that the elution of the toxic metals and the level of eluted Zn were much higher than the regulated value for the solid residues. Five stable geopolymers GPs containing 41.7 wt.% FA were prepared. All GPs showed high compressive strength and low water absorption which support their application as lightweight construction composites. Most importantly, adding FA to GP had significantly reduced metal migration into the environment as confirmed by the synthetic precipitation leaching procedure.
AB - Unlike coal fly ash, fly ash of heavy fuel oil has received much less attention in the literature. In this work, detailed physicochemical characterization of heavy fuel oil fly ash (FA) is provided. The ash has a carbonaceous matrix and contains V, Ni, Zn, Cr, Cu, and Pb with variable amounts. V was the most abundant heavy metal with enrichment factor of 277 in the FA. The presence of V in the FA is attributed to the formation of Mg 3V2O8 oxides at high combustion temperature as confirmed by XRD. Particle size distribution showed that the mean particle diameter of the FA was 70.5 μm. Extraction recovery up to 85% of metals was achieved using 1.0 M HNO3 and at room temperature. Standard metal-leaching tests confirmed that the elution of the toxic metals and the level of eluted Zn were much higher than the regulated value for the solid residues. Five stable geopolymers GPs containing 41.7 wt.% FA were prepared. All GPs showed high compressive strength and low water absorption which support their application as lightweight construction composites. Most importantly, adding FA to GP had significantly reduced metal migration into the environment as confirmed by the synthetic precipitation leaching procedure.
KW - Fly ash
KW - Geopolymerization
KW - Heavy fuel oil
KW - Metals extraction
KW - Surface characterization
UR - http://www.scopus.com/inward/record.url?scp=84894576187&partnerID=8YFLogxK
U2 - 10.1016/j.fuproc.2014.01.040
DO - 10.1016/j.fuproc.2014.01.040
M3 - Article
AN - SCOPUS:84894576187
SN - 0378-3820
VL - 123
SP - 41
EP - 46
JO - Fuel Processing Technology
JF - Fuel Processing Technology
ER -