464
M. Kaya et al.
0.0
50.7
46.5
51.9
55.4
0
10
20
30
40
50
60
70
0
8
1
0
2
1
0
6
0
3
0
Metal dissolution (%)
Time (min.)
Zn
Pb
Fe
As
Ag
0.0
52.6
59.2
65.5
68.1
0
10
20
30
40
50
60
70
0
8
1
0
2
1
0
6
0
3
0
Metal dissolution(%)
Time (min.)
Zn
Pb
Fe
As
Ag
0.0
71.1
77.7
88.3
95.8
0
20
40
60
80
100
0
8
1
0
2
1
0
6
0
3
0
Metal dissolution(%)
Time(min.)
Zn
Pb
Fe
As
Ag
(a)
(b)
(c)
Fig. 4 Metal dissolutions with 1.0 M oxalic acid at S/L ratio of 1/10, a 25 °C, b 40 °C, and c 60 °C
Table 8 Comparison of
metal dissolutions at different
S/L ratios with OA at 60 °C
leaching temperature and
180 min leaching time
1.0 M OA, 60 °C,
180 min
S/L: 1/10 S/L: 2/10 S/L: 3/10
Fe (%)
96.0
55.9
30.0
As (%)
69.0
45.4
25.2
Zn (%)
2.9
3.5
9.0
Pb (%)
3.2
3.4
3.0
Ag (%)
0.0
0.0
0.0