Installation of a Brown Field Slag Reduction Furnace: State …
191
• One tap hole to remove matte if necessary
• One emergency tap hole for fast discharging.
Furnace Hearth
The rectangular furnace hearth is made of a welded steel construction which is
refractory lined, and it is formed as a trough shape with the metal siphon at the
lowest point.
Lead will be discharged by this siphon, while slag is discharged by the slag tap
hole at the front end of the furnace. In case of matte formation, the matte phase may
be discharged from the furnace through the matte tap, which is located at the level
of the slag/lead interface. The emergency tap hole is used for complete discharging
of the furnace during shutdown.
Furnace Body
The furnace walls in the smelting zone consist of water-cooled panels arranged in
three rows. The cooling panels are made of cast electrolytic copper. During furnace
operation, cooling water circulates through the panels. At the cold inner surface of
the cooling panels, the molten slag freezes and forms a so-called freeze-lining. Kuettner introduced independent cooling water supply and controls for each of the 128
individual circuits, thereby providing detailed monitoring and improved automated
controls of the furnace cooling while contributing to operational safety.
Primary air tuyeres are installed at each long side wall in the lower panel row.
These primary tuyeres are operating submerged in the molten slag. Oxygen enriched
air is blown at high speed via these tuyeres into the melt, vigorously agitating the
slag melt and thus ensuring a high degree of intermixing of all reactants.
Upper Furnace
Initial post-combustion takes place above the molten slag. The furnace shell in this
area consists of a water-cooled copper panel layer and is covered in the roof by
water-cooled steel panels.
Secondary tuyeres are installed on each side wall of the post-combustion zone to
enable post-combustion of combustible gases such as CO (carbon monoxide) and
metal vapors such as lead and zinc.
191
• One tap hole to remove matte if necessary
• One emergency tap hole for fast discharging.
Furnace Hearth
The rectangular furnace hearth is made of a welded steel construction which is
refractory lined, and it is formed as a trough shape with the metal siphon at the
lowest point.
Lead will be discharged by this siphon, while slag is discharged by the slag tap
hole at the front end of the furnace. In case of matte formation, the matte phase may
be discharged from the furnace through the matte tap, which is located at the level
of the slag/lead interface. The emergency tap hole is used for complete discharging
of the furnace during shutdown.
Furnace Body
The furnace walls in the smelting zone consist of water-cooled panels arranged in
three rows. The cooling panels are made of cast electrolytic copper. During furnace
operation, cooling water circulates through the panels. At the cold inner surface of
the cooling panels, the molten slag freezes and forms a so-called freeze-lining. Kuettner introduced independent cooling water supply and controls for each of the 128
individual circuits, thereby providing detailed monitoring and improved automated
controls of the furnace cooling while contributing to operational safety.
Primary air tuyeres are installed at each long side wall in the lower panel row.
These primary tuyeres are operating submerged in the molten slag. Oxygen enriched
air is blown at high speed via these tuyeres into the melt, vigorously agitating the
slag melt and thus ensuring a high degree of intermixing of all reactants.
Upper Furnace
Initial post-combustion takes place above the molten slag. The furnace shell in this
area consists of a water-cooled copper panel layer and is covered in the roof by
water-cooled steel panels.
Secondary tuyeres are installed on each side wall of the post-combustion zone to
enable post-combustion of combustible gases such as CO (carbon monoxide) and
metal vapors such as lead and zinc.