Environmental Engineering Reference
In-Depth Information
Table 9.11: Composition of abrasive and alloy prepared from spent catalyst [From ref.
564
.
Reprinted with permission].
Abrasive (wt.%)
Alloy (wt.%)
Fe
2
O
3
0.06
Co
12
.
0
CoO
0.07
Ni
12
.
9
NiO
0.05
Mo
25
.
0
MoO
3
0.06
V
41
.
5
V
2
O
5
0.31
C
1
.
4
S
0.04
Al
1
.
6
C
0.04
Fe
2
.
8
MgO
0.05
Si
1
.
2
Si
0.04
Al
2
O
3
Balance
Table 9.12: Composition of Gulf Chemical and Metallurgical Corporation (GCMC) smelting
products [From ref.
567
. Reprinted with permission].
Weight %
Fused alumina
Mixed alloy
Al
47-51
0.1-0.3
Ni
0
.
1-0
.
3
37-43
Co
<
0.02
12-17
Mo
0
.
1-0
.
3
3-17
V
0
.
1-0
.
3
4-14
Si
0
.
1-0
.
5
1.11
Fe
0
.
5-1
.
2
6-13
Na
0
.
2-1
.
5
-
and refractory applications. The unleached metals present in the alumina residue form a mixed
alloy containing Ni, Co, Mo, and V during smelting process. Composition of the fused alumina
and mixed alloy materials produced by the smelting process are presented in
Table 9.12 [567]
.
Recently, Su et al.
[557]
prepared anorthite glass-ceramic material using the alumina residue
left after recovering the metals from spent hydrotreating catalysts. Small quantities of
unrecovered heavy metals (Co, Mo, V) present in the alumina base were effectively stabilized
in the anorthite glass-ceramic product, which can be used as an electrically insulating material
in the electronic industry.
The use of alumina containing industrial wastes (e.g. spent catalysts) in preparing stressing
cements with low self-stressing energy is reported in a Russian paper
[568]
. In the recent
