Application of CSC Technology in Nonferrous Metallurgy
209
(5) Main equipment specifications and metal recovery:
• Main equipment: CSC smelting furnace 9 m
2 , CSC reduction furnace 7 m
2 ,
and fuming furnace 8 m
2
• Recovery of major metals:
Zinc recovery: 90.27%
Lead recovery: 96.86%
Bismuth recovery: 84.07%
Antimony recovery: 89.11%
Gold recovery: 94.89%
Silver recovery: 95.87%
Lead Continuous Smelting
(1) Typical Case: Lead Smelting Project of a Plant in Guangxi.
(2) Design capacity: Cathode lead; 150 kt/a.
(3) Main process: The Project is the first in China to adopt a three side-blown
continuous smelting process for high antimony lead concentrate (with part of
leaching residue of zinc system). CSC oxygen-enriched air side-blown oxidation
+CSC oxygen-enriched side-blown reduction +CSC oxygen-enriched air sideblown fuming. The Project was completed and put into operation in November
2016. Raw materials are directly fed into an oxidation furnace for oxidation
smelting after proportioning and granulation. Oxidized slag continuously enters
the reduction furnace through a chute. Reduced slag continuously flows into the
fuming furnace through the chute for fuming volatilization, and pulverized coal
is used as fuel and reductant to produce secondary zinc oxide smoke dust and
waste slag, see Fig. 4 for process flow chart. It was put into production in
November 2016.
(4) Process flow:
➀ Side-blown oxidation smelting
After the mixture from the raw material bin is transferred by the belt conveyor, it will
enter the cylinder mixing granulator in the smelting plant to directly add water to mix
and granulate. The ball material is metered and then sent to the oxidation furnace.
The temperature in the furnace is controlled at 1050 °C, and the oxidation furnace is
operated continuously. Two feeding ports are set at the top and nozzles are set at the
side for blowing oxygen-rich air for smelting. One end of the oxidation furnace is a
siphon slag outlet, and the other side is provided with a siphon antimony silver coarse
lead polymetallic outlet. The primary lead is discharged continuously and flows into
the fire refining pot through the chute for preliminary fire refining such as copper
removal; the high lead slag from the slag outlet flows directly into the reduction
furnace through the chute for reduction smelting. A flue gas outlet is arranged above
one end of the siphon port. The high-temperature flue gas from the oxidation furnace
209
(5) Main equipment specifications and metal recovery:
• Main equipment: CSC smelting furnace 9 m
2 , CSC reduction furnace 7 m
2 ,
and fuming furnace 8 m
2
• Recovery of major metals:
Zinc recovery: 90.27%
Lead recovery: 96.86%
Bismuth recovery: 84.07%
Antimony recovery: 89.11%
Gold recovery: 94.89%
Silver recovery: 95.87%
Lead Continuous Smelting
(1) Typical Case: Lead Smelting Project of a Plant in Guangxi.
(2) Design capacity: Cathode lead; 150 kt/a.
(3) Main process: The Project is the first in China to adopt a three side-blown
continuous smelting process for high antimony lead concentrate (with part of
leaching residue of zinc system). CSC oxygen-enriched air side-blown oxidation
+CSC oxygen-enriched side-blown reduction +CSC oxygen-enriched air sideblown fuming. The Project was completed and put into operation in November
2016. Raw materials are directly fed into an oxidation furnace for oxidation
smelting after proportioning and granulation. Oxidized slag continuously enters
the reduction furnace through a chute. Reduced slag continuously flows into the
fuming furnace through the chute for fuming volatilization, and pulverized coal
is used as fuel and reductant to produce secondary zinc oxide smoke dust and
waste slag, see Fig. 4 for process flow chart. It was put into production in
November 2016.
(4) Process flow:
➀ Side-blown oxidation smelting
After the mixture from the raw material bin is transferred by the belt conveyor, it will
enter the cylinder mixing granulator in the smelting plant to directly add water to mix
and granulate. The ball material is metered and then sent to the oxidation furnace.
The temperature in the furnace is controlled at 1050 °C, and the oxidation furnace is
operated continuously. Two feeding ports are set at the top and nozzles are set at the
side for blowing oxygen-rich air for smelting. One end of the oxidation furnace is a
siphon slag outlet, and the other side is provided with a siphon antimony silver coarse
lead polymetallic outlet. The primary lead is discharged continuously and flows into
the fire refining pot through the chute for preliminary fire refining such as copper
removal; the high lead slag from the slag outlet flows directly into the reduction
furnace through the chute for reduction smelting. A flue gas outlet is arranged above
one end of the siphon port. The high-temperature flue gas from the oxidation furnace