Environmental Engineering Reference
In-Depth Information
Table 11.4: Summary of metal recovery by different leaching and roasting methods.
Metal present in
spent catalyst
Reagent
Metal recovered (wt.%)
Reference
Mo
V
Ni
Co
Al
V, Mo, Ni, Co, Al
Na
2
CO
3
+H
2
O
2
99
85
-
-
-
[633]
Mo, Ni, Al
Na
2
CO
3
+H
2
O
2
85
-
65
-
[635]
V, Ni, Mo, Al
NaOH (10%), pH 8.8
92
89
20
-
35
[617]
V, Ni, Mo, Al
NaOH (10%), pH 8.4
99
93
10
-
20
[688]
V, Ni, Mo
NaOH (atmospheric pressure
leaching in two steps)
97
92
-
-
-
[639]
V, Ni, Mo, Al
Aqueous NH
3
solution (17M)
-
99
-
-
-
[617]
NaOH (1
st
stage) and H
2
SO
4
(2
nd
stage)
Ni, Mo, Al
84
-
98
-
-
[636]
NaOH (1
st
stage) and H
2
SO
4
(2
nd
stage)
Ni, Co, Mo, Al
97
-
92
92
65-75
[637]
V, Mo, Co, Ni, Al
Na
2
CO
3
(roasting + leaching with
H
2
O)
90-95
90-95
-
-
-
[654]
NaOH roasting (1
st
stage) H
2
SO
4
leaching (2
nd
stage)
Co, Mo, Al
90
-
-
90
85
[655]
NaOH roasting (1
st
stage) and
H
2
SO
4
leaching (2
nd
stage)
V, Mo, Ni Co, Al
99
96
98
99
91
[659]
Mo, Ni, Al
NaCl roasting + water extraction
90
-
-
-
-
[658]
Mo, Ni, Co, Al
KHSO fusion + water extraction
96
-
90
90
90
[662]
