Installation of a Brown Field Slag Reduction Furnace: State …
189
In the SBF furnace, the lead-high input slag is reduced to lead content below
2%. Coke, which is supplied to the furnace with other solid input materials, is used
as reducing agent. Air is injected through submerged primary tuyeres to strongly
agitate the melt and pre-combust carbon to carbon monoxide. Secondary and tertiary
air are injected into the off-gas flow to ensure complete post-combustion and defined
off-gas temperature.
The products of the SBF furnace are
• Lead bullion containing Antimony
• Secondary slag at <2% Pb
• Dust rich in Pb and Zn (to be recirculated).
The Kuettner scope as an EPC supplier included the following equipment around
the furnace:
• Raw material storage
• Input material conveying and dosing
• Off-gas post-combustion
• Waste heat boiler
• Water quenching
• Filter unit
• Furnace cooling water system
• Complete media supply
• Slag granulation
• Lead decoppering kettles.
A schematic flow diagram of the main plant units is given in Fig. 1
SBF—Side-Blowing Furnace
General
The furnace has a rectangular shape and consists from bottom to the top of mainly
three sections, as shown in Fig. 2:
• Furnace hearth zone
• Furnace body/Smelting zone
• Furnace post-combustion zone.
The furnace is equipped with submerged bath tuyeres, so-called primary tuyeres,
which are arranged on both long side walls of the furnace in the melting zone. In
the post-combustion zone, secondary air tuyeres are arranged along the furnace long
side walls.
The furnace top consists of the process gas offtake for the process gas and the
material feeding ports in the roof of the furnace. In addition, there is also a feed port
189
In the SBF furnace, the lead-high input slag is reduced to lead content below
2%. Coke, which is supplied to the furnace with other solid input materials, is used
as reducing agent. Air is injected through submerged primary tuyeres to strongly
agitate the melt and pre-combust carbon to carbon monoxide. Secondary and tertiary
air are injected into the off-gas flow to ensure complete post-combustion and defined
off-gas temperature.
The products of the SBF furnace are
• Lead bullion containing Antimony
• Secondary slag at <2% Pb
• Dust rich in Pb and Zn (to be recirculated).
The Kuettner scope as an EPC supplier included the following equipment around
the furnace:
• Raw material storage
• Input material conveying and dosing
• Off-gas post-combustion
• Waste heat boiler
• Water quenching
• Filter unit
• Furnace cooling water system
• Complete media supply
• Slag granulation
• Lead decoppering kettles.
A schematic flow diagram of the main plant units is given in Fig. 1
SBF—Side-Blowing Furnace
General
The furnace has a rectangular shape and consists from bottom to the top of mainly
three sections, as shown in Fig. 2:
• Furnace hearth zone
• Furnace body/Smelting zone
• Furnace post-combustion zone.
The furnace is equipped with submerged bath tuyeres, so-called primary tuyeres,
which are arranged on both long side walls of the furnace in the melting zone. In
the post-combustion zone, secondary air tuyeres are arranged along the furnace long
side walls.
The furnace top consists of the process gas offtake for the process gas and the
material feeding ports in the roof of the furnace. In addition, there is also a feed port