660
P. Xin et al.
In accordance with above table, Pb, Zn, and Sb can be collected and recovered
from bag filter, but sulfur goes to offgas in the form of other loss. It can be seen that
lead and zinc can be effectively collected and recovered during antimony smelting
slag treatment by fuming furnace process, Pb recovery is about 95%, Zn recovery is
about 88%, but Sb recovery is comparatively low which is impacted by low saturated
steam pressure of antimony. When the operation temperature is 1250 °C, metals Pb
and Sb are both in liquids, and metal Zn is volatilized in gas. In addition, saturated
steam pressure of Sb is lower than that of Pb, so Pb is easier to volatile than Sb.
Conclusion
Zn, Pb, and Sb in antimony smelting slag can be effectively collected and recovered
by fuming furnace process. The zinc recovery is around 88%, the lead recovery is
about 95%, and the antimony recovery is about 60%. The fuming furnace process
can help the plant to treat with such stored antimony smelting slag and can further
collect and recover some zinc, lead, and antimony as well.
When cold slag is directly fed into fuming furnace, some cold slag goes to following dust collection system rather than falls into bath for reaction due to small
particles. Therefore, agglomeration or screening should be considered to ensure the
particle size of feeding materials. On the other hand, if the particle size of feeding
materials is oversize or too big, the melting speed will slow down, which will have
negative impact on production capacity. Therefore, the range of feeding materials
particle size should be researched and studied during following operation.
If only cold slag is fed into fuming furnace, less cold slag should be fed into
fuming furnace at the first half feeding period to avoid cold slag heaping up at the
bottom of fuming furnace. In accordance with operation experiences in Guangxi raw
antimony rich Polytron Technologies Inc, the feeding speed at the first half hour of
feeding period should be controlled at 12 t/h, and the second half hour should be
controlled at 20 t/h, which can keep normal operation.
References
1. He Q-X, Qin Y-L (2008) On zinc and indium recycle from blast furnace slag by fuming process.
Jiangxi Nonferrous Met 22(2):29–32
2. Richards GG, Brimacombe JK, Toop GW (1985) Kinetics of the zinc slag-fuming process: part
I. Industrial measurements. Metall Trans B 16(B):513–526
P. Xin et al.
In accordance with above table, Pb, Zn, and Sb can be collected and recovered
from bag filter, but sulfur goes to offgas in the form of other loss. It can be seen that
lead and zinc can be effectively collected and recovered during antimony smelting
slag treatment by fuming furnace process, Pb recovery is about 95%, Zn recovery is
about 88%, but Sb recovery is comparatively low which is impacted by low saturated
steam pressure of antimony. When the operation temperature is 1250 °C, metals Pb
and Sb are both in liquids, and metal Zn is volatilized in gas. In addition, saturated
steam pressure of Sb is lower than that of Pb, so Pb is easier to volatile than Sb.
Conclusion
Zn, Pb, and Sb in antimony smelting slag can be effectively collected and recovered
by fuming furnace process. The zinc recovery is around 88%, the lead recovery is
about 95%, and the antimony recovery is about 60%. The fuming furnace process
can help the plant to treat with such stored antimony smelting slag and can further
collect and recover some zinc, lead, and antimony as well.
When cold slag is directly fed into fuming furnace, some cold slag goes to following dust collection system rather than falls into bath for reaction due to small
particles. Therefore, agglomeration or screening should be considered to ensure the
particle size of feeding materials. On the other hand, if the particle size of feeding
materials is oversize or too big, the melting speed will slow down, which will have
negative impact on production capacity. Therefore, the range of feeding materials
particle size should be researched and studied during following operation.
If only cold slag is fed into fuming furnace, less cold slag should be fed into
fuming furnace at the first half feeding period to avoid cold slag heaping up at the
bottom of fuming furnace. In accordance with operation experiences in Guangxi raw
antimony rich Polytron Technologies Inc, the feeding speed at the first half hour of
feeding period should be controlled at 12 t/h, and the second half hour should be
controlled at 20 t/h, which can keep normal operation.
References
1. He Q-X, Qin Y-L (2008) On zinc and indium recycle from blast furnace slag by fuming process.
Jiangxi Nonferrous Met 22(2):29–32
2. Richards GG, Brimacombe JK, Toop GW (1985) Kinetics of the zinc slag-fuming process: part
I. Industrial measurements. Metall Trans B 16(B):513–526