Study of a Novel Chloride Volatilization Process …
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Increasing the content of calcium chloride added has a significant effect on the
increase of the volatilization rate of zinc, lead, indium, and silver. When the addition
amount is 24%, zinc, lead, and indium can obtain better volatilization results, and
the volatilization rate almost all reached more than 85%.
Effect of Chlorinating Agent Content Under Pulverized Coal
The effect of chlorinating agent content on the volatilization rates is investigated
under pulverized coal. The content of chlorinating agent was varied from 12 to 28%
using a roast temperature of 1100 °C, calcination time of 2 h, total feed amount of
50 g, and pulverized coal addition amount of 3%. The effects of the volatilization
rates of copper, silver, and indium are shown in Table 3 and Fig. 5.
It can be seen from Fig. 5 that under the condition of 3% addition of pulverized coal, the volatilization rates of five metals, such as zinc, lead, copper, indium,
and silver, increases to different degrees with the increase of calcium chloride
addition. Among them, the volatilization rate of zinc, copper, and indium metal
Table 3 Metal volatilization rate under pulverized coal
Chlorinating agent content (%)
Volatilization rates/%
Zn
Pb
Cu
In
Ag
12
26.33
93.20
15.38
17.77
86.62
16
51.70
99.02
34.91
41.79
95.21
20
74.23
99.61
56.36
58.05
96.83
24
98.26
99.88
97.32
58.73
95.22
28
99.43
99.86
97.90
75.91
97.34
Fig. 5 Effect of chlorinating
agent content on metal
volatilization rate
10
12
14
16
18
20
22
24
26
28
30
0
10
20
30
40
50
60
70
80
90
100
volatilization rates/%
chlorination agent content/%
Zn
Pb
Cu
In
Ag