The Process and Application of Oxygen-Enriched Air Side Blown …
295
PbS + 2PbO = 3Pb + SO 2
(5)
Heat can be provided by adding flotation sulfur slag to improve the concentration
of SO 2 in the fume and meet the requirement of acid-making system. The main
reaction is as follows:
S + O 2 = SO 2
(6)
Smelting process: Lead-bearing polymetallic materials, flotation sulfur slag,
quartz sand, and crushed coal are fed by disc feeder and measured through the electronic belt scale in accordance with the requirements of the proportioning process,
before charged via the belt conveyer into the oxygen-enriched side blown oxidation
furnace for oxidation smelting. The charge is smelted in the furnace with oxygenenriched air blown in from the tuyeres on both sides of the furnace. The input charge
reacts strongly with oxygen to form lead alloy and slag. The heat required in the
smelting process comes from the combustion heat of crushed coal, flotation sulfur
slag, and the slagging reaction heat. The lead alloy formed from the smelting is precipitated and separated from the slag in the static slag layer below the tuyere with
Pb alloy settled in the hearth bottom and slag in the top layer of the hearth melt. The
slag flows from the slag tap into the reducing furnace for reduction; the lead alloy is
discharged out from the flat head of the furnace end before the casting by the disc
casting machine. Carbon monoxide and elemental sulfur are oxidized by secondary
air blown in the hearth space. The resultant high-temperature fume will be cooled in
the waste heat boiler, purified and dedusted by ESP and bag filter before sent to the
sulfuric acid-making workshop. The dust from the waste heat boiler and ESP dust
will be returned to the smelting process, while the bag filter dust will be sent to the
metal arsenic recovery process.
Reduction Stage
The main reaction equations of the reduction section are as follows:
2C + O 2 = 2CO
(7)
CaCO 3 = CO 2 + CaO
(8)
C + 2PbO · SiO 2 + CaO = 2Pb + CO 2 + SiO 2 · CaO
(9)
CO + PbO · SiO 2 + CaO = Pb + CO 2 + SiO 2 · CaO
(10)
295
PbS + 2PbO = 3Pb + SO 2
(5)
Heat can be provided by adding flotation sulfur slag to improve the concentration
of SO 2 in the fume and meet the requirement of acid-making system. The main
reaction is as follows:
S + O 2 = SO 2
(6)
Smelting process: Lead-bearing polymetallic materials, flotation sulfur slag,
quartz sand, and crushed coal are fed by disc feeder and measured through the electronic belt scale in accordance with the requirements of the proportioning process,
before charged via the belt conveyer into the oxygen-enriched side blown oxidation
furnace for oxidation smelting. The charge is smelted in the furnace with oxygenenriched air blown in from the tuyeres on both sides of the furnace. The input charge
reacts strongly with oxygen to form lead alloy and slag. The heat required in the
smelting process comes from the combustion heat of crushed coal, flotation sulfur
slag, and the slagging reaction heat. The lead alloy formed from the smelting is precipitated and separated from the slag in the static slag layer below the tuyere with
Pb alloy settled in the hearth bottom and slag in the top layer of the hearth melt. The
slag flows from the slag tap into the reducing furnace for reduction; the lead alloy is
discharged out from the flat head of the furnace end before the casting by the disc
casting machine. Carbon monoxide and elemental sulfur are oxidized by secondary
air blown in the hearth space. The resultant high-temperature fume will be cooled in
the waste heat boiler, purified and dedusted by ESP and bag filter before sent to the
sulfuric acid-making workshop. The dust from the waste heat boiler and ESP dust
will be returned to the smelting process, while the bag filter dust will be sent to the
metal arsenic recovery process.
Reduction Stage
The main reaction equations of the reduction section are as follows:
2C + O 2 = 2CO
(7)
CaCO 3 = CO 2 + CaO
(8)
C + 2PbO · SiO 2 + CaO = 2Pb + CO 2 + SiO 2 · CaO
(9)
CO + PbO · SiO 2 + CaO = Pb + CO 2 + SiO 2 · CaO
(10)