Environmental Engineering Reference
In-Depth Information
Table 11.3: Recovery of Ni, Co, Mo and Al present in NiMo and CoMo spent catalysts treated with fusion with KHSO
4
at 350 and
500
◦
C [From ref.
662
. Reprinted with permission].
Catalyst
Product
Metals recovered (wt.%)
Temperature (
◦
C)
Ni or Co
Mo
Al
CoMo
Co
3
(PO
4
)
2
+ Co(OH)
2
(blue
precipitate)
87.6
0.2
Not detected
Not detected
350
±
90.9
0.5
Not detected
Not detected
500
±
NiMo
Ni
3
(PO
4
)
2
+Ni(OH)
2
(green
precipitate)
91.6
0.4
<
0.05
Not detected
350
±
94.2
±
0.8
Not detected
Not detected
500
CoMO
Al(OH)
3
(white solid)
0.05
±
0.01
Not detected
94.5
±
1.1
350
Not detected
Not detected
95.6
±
0.7
500
NiMo
0.05
±
0.01
Not detected
90.2
±
0.9
350
Not detected
Not detected
92.8
±
0.7
500
CoMo
(NH
4
)
7
Mo
6
O
24
·
4H
2
O
(white solid)
Not detected
96.2
±
0.5
Not detected
350
Not detected
99.2
±
0.2
0.05
500
CoMo
Not detected
95.9
±
0.6
<
0.05
350
Not detected
97.4
±
0.5
Not detected
500
