656
P. Xin et al.
The dust produced during such reaction will go to dust collection system together
with offgas. After dust collection, the offgas will be sent to desulphurization system.
Process Description
Antimony smelting slag produced from blast furnace will be fed to fuming furnace
via belt conveyor after weighting. Since fuming process is satisfied with antimony
smelting slag, no flux is required for slag composition adjustment during the process.
The operation of fuming furnace is in batch, and certain molten bath should be
remained in accordance with process requirement. The slag will be tapped out when
one campaign is completed, but certain molten bath should be kept, and then cold
materials will be fed to molten bath of fuming furnace via belt conveyor. Process
air and pulverized coal will be injected into fuming furnace via tuyeres located at
the side of fuming furnace. Pulverized coal is delivered to constant coal feeder by
double cyclones for pulverized coal feeding. Primary air and secondary air as process
air are blown into fuming furnace via injectors. Primary air as coal handle carrier
is mixed with pulverized coal and then injected into injector passage. The primary
air carrying with pulverized coal together with secondary air within injector passage
will be injected into fuming furnace. The cold materials are fed into fuming furnace
during melting stage in batch. The period of melting is around 70–75 min. During
melting stage, the λ (λ = actual air supply/required air for fed coal fully combustion)
should be controlled within 0.9–1.0 to speed up cold slag melting and ensure most
coal completely combustion. For fuming stage, the reducing atmosphere will be
created by adjusting the amount of process air blown from tuyeres and that of coal.
Zinc and lead will be reduced in the molten bath, when λ is controlled within 0.6–0.8.
When the fuming stage is completed, the final slag will be tapped out, and the process
will go to next campaign (Fig. 2).
Major Equipment
The fuming system of antimony smelting slag includes circulation water cooling system, pulverized coal preparation system, materials feeding system, desulphurization
system, and fuming furnace system. For fuming furnace system, the major equipment covers fuming furnace, waste heat boiler for fuming furnace, surface cooler,
bagfilter, ID fan, process blower, and pulverized coal feeder. The specification of
major equipment in such system is shown in Table 1.
P. Xin et al.
The dust produced during such reaction will go to dust collection system together
with offgas. After dust collection, the offgas will be sent to desulphurization system.
Process Description
Antimony smelting slag produced from blast furnace will be fed to fuming furnace
via belt conveyor after weighting. Since fuming process is satisfied with antimony
smelting slag, no flux is required for slag composition adjustment during the process.
The operation of fuming furnace is in batch, and certain molten bath should be
remained in accordance with process requirement. The slag will be tapped out when
one campaign is completed, but certain molten bath should be kept, and then cold
materials will be fed to molten bath of fuming furnace via belt conveyor. Process
air and pulverized coal will be injected into fuming furnace via tuyeres located at
the side of fuming furnace. Pulverized coal is delivered to constant coal feeder by
double cyclones for pulverized coal feeding. Primary air and secondary air as process
air are blown into fuming furnace via injectors. Primary air as coal handle carrier
is mixed with pulverized coal and then injected into injector passage. The primary
air carrying with pulverized coal together with secondary air within injector passage
will be injected into fuming furnace. The cold materials are fed into fuming furnace
during melting stage in batch. The period of melting is around 70–75 min. During
melting stage, the λ (λ = actual air supply/required air for fed coal fully combustion)
should be controlled within 0.9–1.0 to speed up cold slag melting and ensure most
coal completely combustion. For fuming stage, the reducing atmosphere will be
created by adjusting the amount of process air blown from tuyeres and that of coal.
Zinc and lead will be reduced in the molten bath, when λ is controlled within 0.6–0.8.
When the fuming stage is completed, the final slag will be tapped out, and the process
will go to next campaign (Fig. 2).
Major Equipment
The fuming system of antimony smelting slag includes circulation water cooling system, pulverized coal preparation system, materials feeding system, desulphurization
system, and fuming furnace system. For fuming furnace system, the major equipment covers fuming furnace, waste heat boiler for fuming furnace, surface cooler,
bagfilter, ID fan, process blower, and pulverized coal feeder. The specification of
major equipment in such system is shown in Table 1.