View Full Table | Close Full ViewTable 1.

Characteristics of coal utilization by-products (CUB) samples used in this study.

 
Sample CUB type† Combustor type‡ ASTM class Moisture % LOI %§
FA 22 FA PC C 0.36 3.06
FA 23 FA PC C 0.82 8.53
FA 47 FA PC C 0.08 0.32
CRC 9 w/ FA PC w SCR C 0.29 2.75
CRC 9 w/o FA PC w/o SCR C 0.48 5.44
FA 26 FA PC F 3.00 18.74
FA 39 FA PC F 0.45 0.91
FA 44 FA PC F 41.6 10.03
FA 34 FA FBC n/a 0.82 8.01
FA 45 FA FBC n/a 0.00 4.24
FA 40 BA PC n/a 0.00 7.40
FGD 1 FGD n/a n/a
SRM 1633b FA Unknown (NIST standard)
FA, fly ash; BA,= bottom ash; FGD, flue-gas desulfurization product.
PC, pulverized coal; FBC, fluidized-bed combustor; SCR, selective catalytic reduction.
§LOI, loss on ignition.



View Full Table | Close Full ViewTable 2.

Whole coal utilization by-products (CUB) and CUB sequential leach Sr concentration and isotope data.

 
Sample† Whole CUB
H2O leach
0.1 M HOAc leach
1 M HCl leach
Sr‡ § Sr‡ § Sr‡ § Sr‡ §
Class C fly ash
 FA 22 1011 13.90 ± 0.14 150 9.19 ± 0.16 184 9.69 ± 0.16 310 12.06 ± 0.11
 FA 23 822 13.49 ± 0.11 121 9.90 ± 0.14 196 10.03 ± 0.11 268 13.09 ± 0.11
 FA 47 2961 36.11 ± 0.14 379 32.91 ± 0.11 819 33.93 ± 0.17 1454 37.10 ± 0.14
 CRC 9 w/ 2743 40.70 ± 0.13 478 38.64 ± 0.16 643 41.67 ± 0.16 1473 41.33 ± 0.16
 CRC 9 w/o 2946 39.68 ± 0.13 458 37.26 ± 0.18 563 40.40 ± 0.11 1672 39.79 ± 0.14
Class F fly ash
 FA 26 359 47.44 ± 0.16 40.8 22.72 ± 0.16 25.1 22.11 ± 0.14 20.8 24.82 ± 0.14
 FA 39 1093 48.10 ± 0.14 88.3 28.58 ± 0.16 139 28.47 ± 0.17 212 30.67 ± 0.17
 FA 44 525 70.32 ± 0.14 21.0 35.93 ± 0.11 22.7 36.13 ± 0.10 25.7 38.61 ± 0.16
FBC fly ash
 FA 34 363 22.79 ± 0.16 98.5 −7.64 ± 0.13 65.9 1.16 ± 0.14 98.9 16.02 ± 0.08
 FA 45 235 141.63 ± 0.14 63.7 8.43 ± 0.10 31.6 21.77 ± 0.20 41.3 80.94 ± 0.11
Bottom ash
 FA 40 482 69.79 ± 0.17 1.21 31.64 ± 0.21 0.26 30.95 ± 0.38 0.67 34.46 ± 0.51
FGD
 FGD 1 321 −16.75 ± 0.13
Fly ash standard
 SRM 1633b 936 51.07 ± 0.14 24.8 28.57 ± 0.13 37.4 27.55 ± 0.16 100 26.86 ± 0.13
FBC, fluidized-bed combustion; FGD, flue-gas desulfurization.
Sr in whole-CUB is mg/kg; Sr in leachates is mg Sr leached per kg starting material.
§= 104(87Sr/86Srsample/87Sr/86Srseawater- 1); 87Sr/86Srseawater = 0.709164. Quoted error is 2σ in-run uncertainty.