the coking properties of coal at elevated pressures. - Argonne ...

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SURFACE AND BULK ENRICHMENT OF COAL COMBUSTION ASH FOR SELECTED ELEMENTS
ELEMENT
As
Cd
Cr
Pb
Sb
Se
TP,
W
Zn
AI
Ca
CI1
cs
Fe
K
Pfc:
Mn
Na
Rb
Ti
I
*
BULK
ENRI CHbENT
BULK**
**,k
SURFACE
9.4 13.4
--_
___
___
11.5
2.4
3.8
7.9
10.4
__-
7.1
7.8
1.0
1.1
1.1
1.2
1.3
1.1
1.3
1.5
1.5
1.1
1.2
Be 1.6
cu I 2.3
6.2
8.4
---
5.4
4.9
---
6.2
1.6
1.0
1.0
___
1.3
1.3
---
1.7
--_
1.7
1.2
---
2.2
3.3
11.0
1.1
1.6
___
___
0.8
7.6
0.9
6.4
15.2
_--
V I 3.8 2.7 2.0
''Bulk enrichment defined as the ratio of the concentration ina 1U particles
to that in an 18.5~ particle, from D.G. Coles, R.C. Ragaini, J.M. Ondov,
G.L. Fisher, D. Silberman, B.A. Prentice, Environ. Sci. & Tech., 13, 455
(1979).
>k ?<
Bulk enrichment defined as the ratio of the concentration in a 0.15~
particle to that in a 20p particle, from R.D.
& Comb. Sci., 6, 53 (1980).
Smith, Prog. in Energy
**??
Surface enrichment defined as the ratio of the surface composition divided
by the composition at 500 8, from R.W. Linton, P. Williams, C.A. Evans, Jr.,
and D.S.F. Natusch, Anal. Chem., - 49, 1514 (1977).
143
0.9
6.0