840
H. B. Wang et al.
Results and Discussion
Effect of Chlorinating Agent Content Under No Pulverized
Coal
The effect of chlorinating agent content on the volatilization rates is investigated
under no pulverized coal. The content of chlorinating agent was varied from 12 to
24% using roast temperature of 1100 °C, roast time of 2 h, and total feed amount of
50 g. The effects of the volatilization rates of copper, silver, and indium are shown
in Table 2 and Fig. 4.
It can be seen from Fig. 4 that under the condition of no addition of pulverized
coal, with the increase of the content of calcium chloride, the volatilization rate of
zinc, lead, indium, and silver metal increases greatly, and the increase rate of copper
volatilization rate is small. During the increase of calcium chloride from 12 to 24%,
the volatilization rate of zinc, lead, indium, silver, and copper increased from 29% to
85.53%, from 30.21% to 85.33%, from 55.67% to 91.42%, from 37.46% to 68.18%,
and from 11.12% to 32.98%, respectively.
Table 2 Metal volatilization rate under no pulverized coal
Chlorinating agent content (%)
Volatilization rate/%
Zn
Pb
Cu
In
Ag
12
29.00
30.21
11.12
55.67
37.46
16
44.87
32.67
21.29
80.88
41.46
20
65.87
50.24
23.69
88.05
48.41
24
85.53
85.33
32.98
91.42
68.18
Fig. 4 Effect of chlorinating
agent on volatilization
12
14
16
18
20
22
24
0
10
20
30
40
50
60
70
80
90
100
volatilization rates/%
chlorination agent content/%
Zn
Pb
Cu
In
Ag