460
M. Kaya et al.
Table 6 Effect of S/L ratio on metal dissolution at 1.0 M CA concentration and 80 °C leaching
temperature
Citric acid (CA)
Zn (%)
As (%)
Fe (%)
Pb (%)
S/L ratio: 1/10, time
80 °C
1.0 M
1/10 S/L
400 rpm
30 min
83.5
14.0
11.0
10.0
60 min
89.1
15.0
13.0
11.0
120 min
90.6
16.0
17.0
11.0
180 min
91.0
17.0
19.0
12.0
Metal
Dissolution
Order
Zn > Fe > As > Pb
S/L ratio: 2/10, time
80 °C
1.0 M
2/10 S/L
400 rpm
30 min
72.0
12.0
11.0
8.0
60 min
79.4
13.0
14.0
8.0
120 min
88.0
14.0
17.0
9.0
180 min
90.6
15.0
20.0
10.0
Metal
Dissolution
Order
Zn > Fe > As > Pb
S/L ratio: 3/10, time
80 °C
1.0 M
3/10 S/L
400 rpm
60 min
64.7
11.0
11.0
6.0
120 min
69.0
12.0
13.0
7.0
180 min
80.0
13.0
16.0
7.0
240 min
82.6
13.0
18.0
7.0
PLS
78.3
11.2
17.8
7.0
Metal
Dissolution
Order
Zn > Fe > As > Pb
Fig. 2 PLS of citric (left) and H 2 SO 4 (right) leach solutions