the hydrophobic character of pretreated coal surfaces.
the hydrophobic character of pretreated coal surfaces. the hydrophobic character of pretreated coal surfaces.
150 100 t m- Pressurized by Air (20 psi). aged in Air, air Bubble Pressurized by C02 (20 psi), aged In air, C02 bubble Pressurized by CO2 (20 psi), aged In N2. C02 bubble 0' I I 1 I 1 0 5 10 15 20 25 30 35 AGING TIHE, hours Figure 3 Bubble attachment time measured on the polished surfxe of a preaeated low-volatile bituminous coal as a function of aging time of the coal. 1.7 . 1.6 - C02 Pressure 20 psi 1.3 ' I 0 100 200 300 C0,-COAL INTERACTION TINE, min Figure 4 The hydrophilicity index of a m-pretreated high-volatile bituminous coal ( -5 micron ) at 302 OK determined by DRIFT-FTIR spectroscopy as a function of m-coal interactloli time. 816
COAL IlACROrlOLECULES a COAL VOLATILE IlATTER 48 fllNERAL IlATTER a POLARIZED co2 0 NONPOLAR co2 @,e CHARGE0 SITES Figure 5 Schematic drawing of carbon dioxide adsorption by coal. S Hydrophlllclty Index o Bubble Attachment Tlme Flotation Recovery 80 60 40 20 0 0 2 4 6 8 IO' IO2 IO3 IO4 HEATING TIRE, min. Figure 6 Hydrophobic character of lignite evaluated by the DRIFT-FTIR hydrophilicity index, bubble attachment time and flotation recovery as a function of rhemal-maanent time.0) 817
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- Page 3 and 4: lignite by thermal txahnent arises
- Page 5: 40 - LIG SUB HVB MVB LVB ANT COAL R
150<br />
100<br />
t<br />
m-<br />
Pressurized<br />
by Air (20 psi).<br />
aged in Air,<br />
air Bubble<br />
Pressurized<br />
by C02 (20 psi),<br />
aged In air,<br />
C02 bubble<br />
Pressurized<br />
by CO2 (20 psi),<br />
aged In N2.<br />
C02 bubble<br />
0' I I 1 I 1<br />
0 5 10 15 20 25 30 35<br />
AGING TIHE, hours<br />
Figure 3<br />
Bubble attachment time measured on <strong>the</strong> polished surfxe <strong>of</strong> a preaeated low-volatile<br />
bituminous <strong>coal</strong> as a function <strong>of</strong> aging time <strong>of</strong> <strong>the</strong> <strong>coal</strong>.<br />
1.7 .<br />
1.6 - C02 Pressure 20 psi<br />
1.3<br />
' I<br />
0 100 200 300<br />
C0,-COAL INTERACTION TINE, min<br />
Figure 4 The hydrophilicity index <strong>of</strong> a m-<strong>pretreated</strong> high-volatile bituminous <strong>coal</strong> ( -5 micron )<br />
at 302 OK determined by DRIFT-FTIR spectroscopy as a function <strong>of</strong> m-<strong>coal</strong><br />
interactloli time.<br />
816
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