206
X. Wu
(4) The brief description of process flow: The annual treatment capacity of copper
and nickel ore in this project is 292,728.33 t, including 82,000 t of ultra rich block
ore and 210,728.33 t of copper and nickel concentrate. Ultra rich ore, coppernickel concentrate, quartzite, smoke, and pulverized coal are measured by disc
feeder and electronic belt scale, respectively, according to the requirements
of proportioning ratio, and then transported to proportioning belt conveyor,
and then transferred by belt into oxygen-enriched side blowing furnace for
oxygen-enriched matte smelting.
In the oxygen-enriched side blowing furnace and from the Tuyeres on both sides
of the furnace body, the charge is blown into the oxygen-enriched air with the oxygen
content of ~60% for smelting in the oxygen-enriched molten pool. The height of the
tuyere is 0.5 m below the top surface of the slag layer, and the slag layer above the
tuyere will generate a bubble layer due to the strong agitation of the oxygen-enriched
air, which will melt the added charge and generate a strong oxidation and slagging
reaction to generate copper-nickel matte and slag. The heat needed in smelting process mainly comes from the oxidation of sulfur in raw materials and the reaction heat
of slagging, and a small part comes from the combustion heat of pulverized coal.
The copper-nickel matte produced by smelting and slag is precipitated and separated
in a static slag layer 1 m deep below the tuyere. The low matte nickel produced by
smelting is deposited in the bottom of furnace, the slag containing low copper-nickel
is discharged from the slag mouth in the upper layer of furnace melt; the low matte
nickel is discharged from the siphon mouth at the furnace end; the reductive gas discharged from the furnace body is oxidized by the air inhaled in the furnace space to
produce high-temperature flue gas containing SO 2 15–25%. After being discharged,
it is cooled by waste heat boiler, purified by electric dust collector and sent to sulfuric
acid workshop for acid production.
The low ice nickel and slag produced in the smelting process flow into the dilution
electric furnace through the launder for reduction, clarification, and separation. The
pulverized coal is added above the electric furnace as the reducing agent, and the
dosage is 980 kg/h. After the melt is fully clarified and separated in the dilution
electric furnace, the upper layer is the dilution slag, which is discharged through the
slag mouth, and the water is broken into waste slag. The slag is lifted to the slag bin by
the chain bucket raking machine and then transported to the slag yard by the tipper.
Low ice nickel is siphoned out and lifted to converter by ladle. The concentration
of sulfur dioxide in the flue gas of the dilution electric furnace is less than 0.02%,
which is discharged after the waste heat recovery and dust collection. On the one
hand, low ice nickel can be used as curing agent, on the other hand, the converter is
intermittently charged, and the furnace plays the role of heat preservation.
The low ice nickel of the dilution electric furnace is put into the ladle intermittently
and is hoisted by the crane and added into the PS converter for blowing. Converter
blowing is an oxidation reaction process. Low ice nickel is mainly composed of
Cu 2 S, Ni 3 S 2 , and FES. The task of blowing is to oxidize and slag FES in low ice
nickel, remove iron and part of sulfur, and produce high ice nickel composed of Cu 2 S
and Ni 3 S 2 and enriched precious metals. Its grade (Ni + Cu) is about 78%.
X. Wu
(4) The brief description of process flow: The annual treatment capacity of copper
and nickel ore in this project is 292,728.33 t, including 82,000 t of ultra rich block
ore and 210,728.33 t of copper and nickel concentrate. Ultra rich ore, coppernickel concentrate, quartzite, smoke, and pulverized coal are measured by disc
feeder and electronic belt scale, respectively, according to the requirements
of proportioning ratio, and then transported to proportioning belt conveyor,
and then transferred by belt into oxygen-enriched side blowing furnace for
oxygen-enriched matte smelting.
In the oxygen-enriched side blowing furnace and from the Tuyeres on both sides
of the furnace body, the charge is blown into the oxygen-enriched air with the oxygen
content of ~60% for smelting in the oxygen-enriched molten pool. The height of the
tuyere is 0.5 m below the top surface of the slag layer, and the slag layer above the
tuyere will generate a bubble layer due to the strong agitation of the oxygen-enriched
air, which will melt the added charge and generate a strong oxidation and slagging
reaction to generate copper-nickel matte and slag. The heat needed in smelting process mainly comes from the oxidation of sulfur in raw materials and the reaction heat
of slagging, and a small part comes from the combustion heat of pulverized coal.
The copper-nickel matte produced by smelting and slag is precipitated and separated
in a static slag layer 1 m deep below the tuyere. The low matte nickel produced by
smelting is deposited in the bottom of furnace, the slag containing low copper-nickel
is discharged from the slag mouth in the upper layer of furnace melt; the low matte
nickel is discharged from the siphon mouth at the furnace end; the reductive gas discharged from the furnace body is oxidized by the air inhaled in the furnace space to
produce high-temperature flue gas containing SO 2 15–25%. After being discharged,
it is cooled by waste heat boiler, purified by electric dust collector and sent to sulfuric
acid workshop for acid production.
The low ice nickel and slag produced in the smelting process flow into the dilution
electric furnace through the launder for reduction, clarification, and separation. The
pulverized coal is added above the electric furnace as the reducing agent, and the
dosage is 980 kg/h. After the melt is fully clarified and separated in the dilution
electric furnace, the upper layer is the dilution slag, which is discharged through the
slag mouth, and the water is broken into waste slag. The slag is lifted to the slag bin by
the chain bucket raking machine and then transported to the slag yard by the tipper.
Low ice nickel is siphoned out and lifted to converter by ladle. The concentration
of sulfur dioxide in the flue gas of the dilution electric furnace is less than 0.02%,
which is discharged after the waste heat recovery and dust collection. On the one
hand, low ice nickel can be used as curing agent, on the other hand, the converter is
intermittently charged, and the furnace plays the role of heat preservation.
The low ice nickel of the dilution electric furnace is put into the ladle intermittently
and is hoisted by the crane and added into the PS converter for blowing. Converter
blowing is an oxidation reaction process. Low ice nickel is mainly composed of
Cu 2 S, Ni 3 S 2 , and FES. The task of blowing is to oxidize and slag FES in low ice
nickel, remove iron and part of sulfur, and produce high ice nickel composed of Cu 2 S
and Ni 3 S 2 and enriched precious metals. Its grade (Ni + Cu) is about 78%.