66
J. Wood et al.
Table 1 Composition of zinc materials tested at Outotec Ausmelt facilities
Zinc
concentrate
Zinc-Lead
concentrate
ISP
slag
Lead
BF
Slag
Neutral
leach
residue
Jarosite Goethite EAF
Dust
% Zn
43.6
26.9
12.0
14.3
20.6
2.6
14.3
19.5
% Pb
0.6
18.3
0.9
1.7
5.9
3.3
2.8
2.5
% Fe
12.4
12.5
34.5
22.0
23.5
24.5
36.0
32.0
% As
0.2
0.1
0.1
0.1
0.2
0.1
0.2
0.4
% S
30.4
29.7
–
–
5.9
12.2
4.7
< 0.1
%SiO 2
2.2
8.6
15.2
29.0
4.3
7.6
1.8
3.0
ppm
Ag
600
185
–
20
270
100
100
100
ppm In < 300
–
–
–
–
–
–
–
ppm
Ge
< 200
13
–
–
–
–
–
–
Fig. 2 View of Xingan Ausmelt zinc fuming plant
years, today there is a greater focus than ever on minimising energy consumption
and CO 2 emissions from industrial processes as part of the sustainability initiatives
being promoted by all environmentally responsible companies.