1876 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
to determine the presence of nickel leached into solution.
The chemical analysis findings are shown in Figure 1(a),
which shows that HNO3 gave the greatest results for nickel
recovery at an ideal leaching time of 12 hours. Yet due to
practical, economical, and environmental considerations,
H2SO4 was chosen for further research. Consequently, the
preliminary leaching investigations demonstrated that an
oxidant was necessary for efficient leaching since HNO3 is
a comparatively more effective oxidant (Sastre et al., 2002).
Traditional oxidizing agents were therefore evaluated to
improve the leaching recovery of H2SO4 under the same
leaching conditions (Hernández et al., 2015 Watling,
2013). There were variations in the molar concentration
of H2SO4. As can be seen from Figure 1(b), the outcome
0
10
20
30
40
50
60
70
0 6 12 18 24 30 36 42 48
Leaching time (h)
HNO3
HCL
H2SO4
(a)
0
10
20
30
40
50
60
70
80
90
0.5 M
H2SO4
1 M
H2SO4
2 M
H2SO4
4 M
H2SO4
1 M
H2SO4
+20 g/ l
FeCl3
1 M
H2SO4
+20 g/ l
NaCl
1 M
H2SO4
+20 g/ l
MgCl2
(b)
Figure 1. The leaching recoveries of Ni for (a) HNO
3 ,HCL, and H
2 SO
4 dissolution (b) different
concentrations of H
2 SO
4 and 20 g/L addition of FeCl
3 ,NaCl, and MgCl
2
Ni
recvovery
(%)
Ni
recovery
(%)