The Recovery of Pb and Zn in Antimony Smelting Slag
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Fuming Furnace
WHB
ZnO Dust
Oī Gas
Bag filter
To Gas desulfurizaƟon
Oī Gas
Fan
Oī Gas
ZnO Dust
SeƩling chamber
Oī Gas
ZnO Dust
ZnO Dust
To Zinc plant
FF Slag
Slag granulaƟon
Cold Slag
Pulverized coal
Secondary air
Primary air
Fig. 2 Process block diagram of fuming furnace
Table 1 Major equipment
specification
Equipment
Unit
Specification
Fuming furnace
m 2
7.0
Blower
m 3 /min 300
Waste heat boiler
t/h
~15 t/h
Surface cooler
m 2
1000
Bag filter
m 2
2200
Pulverized coal feeder
t/h
3*2
Pulverized coal preparation system t/h
10
Major Production Data and Process Data
The antimony smelting slag treated is the slag stored during antimony production,
so the composition of slag has few variation. The composition of antimony smelting
slag is shown in Table 2.
Table 2 states that Pb in the slag is almost similar to that from blast furnace of lead
smelting, which shows that zinc in slag is low, antimony content and lead content
are almost same, and Fe/SiO 2 = 0.93 and CaO/SiO 2 = 0.86.