TY - GEN
T1 - Abundances and distribution of minerals and elements in high-alumina coal fly ash from the Jungar Power Plant, Inner Mongolia, China; ICCP-TSOP 2008; selected papers from the ICCP-TSOP joint meeting 2008
AU - Dai, Shifeng
AU - Zhao Lei, Peng
AU - Suping, Chou
AU - Chen-Lin, Wang Xibo
AU - Zhang Yong, Li Dan
AU - Sun Yingying, null
N1 - Conference Proceedings
PY - 2010
Y1 - 2010
N2 - The fly ash from the Jungar Power Plant, Inner Mongolia, China, is unique because it is highly enriched in alumina (Al (sub 2) O (sub 3) > 50%). The fly ash mainly consists of amorphous glass and mullite and trace amounts of corundum, quartz, char, calcite, K-feldspar, clay minerals, and Fe-bearing minerals. The mullite content in fly ash is as high as 37.4% because of high boehmite and kaolinite contents in feed coal. Corundum is a characteristic mineral formed during the combustion of boehmite-rich coal. Samples from the economizer were sieved into six size fractions (500 mesh) and separated into magnetic, mullite+corundum+quartz (MCQ) and glass phases for mineralogical and chemical analysis. The corundum content increases but amorphous glass decreases with decreasing particle size. Fractions of small particle sizes are relatively high in mullite, probably because mullite was formed from fine clay mineral particles under high-temperature combustion condition. Similarly, fine corundum crystals formed in the boiler from boehmite in feed coal. The magnetic phase consists of hematite, magnetite, magnesioferrite, and MgFeAlO (sub 4) crystals. The MCQ phase is composed of 89% mullite, 6.1% corundum, 4.5% quartz, and 0.5% K-feldspar. Overall, the fly ash from the power plant is significantly enriched in Al (sub 2) O (sub 3) with an average of 51.9%, but poor in SiO (sub 2) , Fe (sub 2) O (sub 3) , CaO, MgO, Na (sub 2) O, P (sub 2) O (sub 5) , and As. Arsenic, TiO (sub 2) , Th, Al (sub 2) O (sub 3) , Bi, La, Ga, Ni, and V are high in mullite, and the magnetic matter is enriched in Fe (sub 2) O (sub 3) , CaO, MnO, TiO (sub 2) , Cs, Co, As, Cd, Ba, Ni, Sb, MgO, Zn, and V. The remaining elements are high in the glass fraction. The concentration of K (sub 2) O, Na (sub 2) O, P (sub 2) O (sub 5) , Nb, Cr, Ta, U, W, Rb, and Ni do not clearly vary with particle size, while SiO (sub 2) and Hg decrease and the remaining elements clearly increase with decreasing particle size.
AB - The fly ash from the Jungar Power Plant, Inner Mongolia, China, is unique because it is highly enriched in alumina (Al (sub 2) O (sub 3) > 50%). The fly ash mainly consists of amorphous glass and mullite and trace amounts of corundum, quartz, char, calcite, K-feldspar, clay minerals, and Fe-bearing minerals. The mullite content in fly ash is as high as 37.4% because of high boehmite and kaolinite contents in feed coal. Corundum is a characteristic mineral formed during the combustion of boehmite-rich coal. Samples from the economizer were sieved into six size fractions (500 mesh) and separated into magnetic, mullite+corundum+quartz (MCQ) and glass phases for mineralogical and chemical analysis. The corundum content increases but amorphous glass decreases with decreasing particle size. Fractions of small particle sizes are relatively high in mullite, probably because mullite was formed from fine clay mineral particles under high-temperature combustion condition. Similarly, fine corundum crystals formed in the boiler from boehmite in feed coal. The magnetic phase consists of hematite, magnetite, magnesioferrite, and MgFeAlO (sub 4) crystals. The MCQ phase is composed of 89% mullite, 6.1% corundum, 4.5% quartz, and 0.5% K-feldspar. Overall, the fly ash from the power plant is significantly enriched in Al (sub 2) O (sub 3) with an average of 51.9%, but poor in SiO (sub 2) , Fe (sub 2) O (sub 3) , CaO, MgO, Na (sub 2) O, P (sub 2) O (sub 5) , and As. Arsenic, TiO (sub 2) , Th, Al (sub 2) O (sub 3) , Bi, La, Ga, Ni, and V are high in mullite, and the magnetic matter is enriched in Fe (sub 2) O (sub 3) , CaO, MnO, TiO (sub 2) , Cs, Co, As, Cd, Ba, Ni, Sb, MgO, Zn, and V. The remaining elements are high in the glass fraction. The concentration of K (sub 2) O, Na (sub 2) O, P (sub 2) O (sub 5) , Nb, Cr, Ta, U, W, Rb, and Ni do not clearly vary with particle size, while SiO (sub 2) and Hg decrease and the remaining elements clearly increase with decreasing particle size.
KW - ISGS
UR - http://www.sciencedirect.com/science/journal/01665162
U2 - 10.1016/j.coal.2009.03.005
DO - 10.1016/j.coal.2009.03.005
M3 - Conference contribution
SN - 0166-5162
VL - 81
SP - 320
EP - 332
BT - International Journal of Coal Geology
A2 - Suarez-Ruiz, Isabel
PB - Elsevier
CY - Amsterdam, Netherlands
ER -