CN109865388A - A kind of temperature control purification method of the flue gas during smelting for relieving haperacidity - Google Patents
A kind of temperature control purification method of the flue gas during smelting for relieving haperacidity Download PDFInfo
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- CN109865388A CN109865388A CN201910189737.5A CN201910189737A CN109865388A CN 109865388 A CN109865388 A CN 109865388A CN 201910189737 A CN201910189737 A CN 201910189737A CN 109865388 A CN109865388 A CN 109865388A
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Abstract
The invention discloses a kind of temperature control purification method of flue gas during smelting for relieving haperacidity, this method stablizes the temperature of Flue Gas of Nonferrous Smelting at 180 DEG C -230 DEG C, and at this temperature, sulfur trioxide and vapor will not condense；Flow velocity of the flue gas in flue gas register is 1m/min-2.5m/min, and arsenic trioxide is sublimated and is attached on soot dust granule, is conducive to remove together with flue dust, and recycled in a manner of solid, is generated without acidic arsenic-containing waste water；Then sulfuric acid is formed with the sulfur trioxide and moisture in concentrated sulfuric acid absorption flue gas during smelting, sulfur trioxide is enable to recycle.Present invention process is succinct, process control, stabilization, arsenic trioxide depth is sublimated and is attached on soot dust granule, be conducive to recycle together with solid forms with flue dust, sulfur trioxide and vapor will not condense in flue gas, and can be absorbed by the concentrated sulfuric acid and form sulfuric acid product, high dust collection efficiency of the present invention, good purification have a good application prospect.
Description
Technical field
The invention belongs to flue gas during smelting purification techniques fields, and in particular to a kind of temperature control of the flue gas during smelting for relieving haperacidity is net
Change method.
Background technique
The Flue Gas of Nonferrous Smelting such as copper blast furnace off-gas, nickel fibers flue gas, lead-zinc smelting flue gas etc. that non-ferrous metal metallurgy generates,
Flue gas is large-minded, and temperature fluctuation is big (120 DEG C -400 DEG C), containing dust (main component be silica, lead oxide, calcium oxide,
Copper oxide, di-iron trioxide etc.), sulfur dioxide, arsenic trioxide, sulfur trioxide and vapor etc., if be directly discharged to big
In gas, environment is seriously polluted.Administer Flue Gas of Nonferrous Smelting in most cases surround recycling sulfur dioxide for extracting sulfuric acid into
Row takes into account recycling dust and arsenic trioxide.
Flue Gas of Nonferrous Smelting is used for extracting sulfuric acid, needs to remove dust, arsenic trioxide, sulfur trioxide in flue gas, this
A process is known as the purification of flue gas.The purification of flue gas is divided into wet process and dry method.Wet cleaning process includes electrostatic dust collection, washing drop
The links such as warm dedusting, electrostatic acid-mist-removing, the dry water removal of 92% sulfuric acid.Wet cleaning process is little by temperature fluctuations affect, but deposits
Deficiency be that technique is tediously long, equipment investment is big, generates a large amount of arsenic-containing acid waste water, and arsenic-containing acid waste water treatment also needs secondary throwing
Money.
Comparatively ideal situation is dry cleaning, and Chengdu YiTai Science Co., Ltd discloses a kind of " flue gas during smelting purification work
Skill " (CN107952342A), step include: a, removing sulfur trioxide, make sulfur trioxide in flue gas during smelting by mainly by
Any one or a few substance forms the absorption of powdery absorbent in magnesium hydroxide, calcium hydroxide, magnesia and calcium oxide；B, it removes
Dirt, in the state that gas to be processed is maintained at temperature higher than the de-sublimation temperature of arsenic trioxide, high-temperature dust removal；C, arsenic is received, it will
The de-sublimation temperature to be processed for being cooled to arsenic trioxide is hereinafter, recycling arsenic trioxide；D, third gas to be processed is passed through two
Sulfur oxide relieving haperacidity unit, to obtain sulfuric acid product by sulfur dioxide relieving haperacidity unit.Deficiency existing for the purification process is three
Sulfur oxide is converted into magnesium sulfate, calcium sulfate etc. and sublimates containing useless solid material, arsenic trioxide at 250 DEG C or more, sublimates depth not
Enough, crystal grain-growth is little, causes filtering removal insufficient.Sulfur trioxide when entrance flue gas temperature is lower than 170 DEG C, in flue gas
It can condense with vapor, deduster can block, efficiency of dust collection decline, or even cause to stop production.
Summary of the invention
The purpose of the present invention is to solve the technical problems existing in the prior art, a kind of simple process, process are provided
The temperature control purification method of the flue gas during smelting for relieving haperacidity of controllable stabilization, high dust collection efficiency, good purification.
In order to achieve the above object, the invention adopts the following technical scheme: a kind of temperature control of the flue gas during smelting for relieving haperacidity
Purification method, method includes the following steps:
A, regulate and control flue-gas temperature: so that Flue Gas of Nonferrous Smelting is passed through flue gas register, flue-gas temperature is adjusted to 180 DEG C -230
DEG C, at this temperature, sulfur trioxide and vapor will not condense, and flow velocity of the flue gas in flue gas register is 1m/min-
2.5m/min, arsenic trioxide are sublimated and are attached on soot dust granule；
B, dedusting arsenic removal: 180 DEG C of -230 DEG C of flue gas during smeltings in step A are passed through in deduster by keeping the temperature flue, keep removing
Dust of the dirt device temperature in 180 DEG C -230 DEG C, flue gas during smelting, the arsenic trioxide sublimated are retained in by solid gas separating treatment
In deduster, the flue gas during smelting dust-laden after dedusting arsenic removal is less than 5mg/Nm3, the dirt containing arsenic powder being retained in deduster periodically arranges
Out, make further recovery processing；
C, it absorbs sulfur trioxide and water: the flue gas during smelting after dedusting arsenic removal being passed through absorption tower, keeps flue gas during smelting inverse with the concentrated sulfuric acid
Stream contact, the concentrated sulfuric acid absorb flue gas during smelting in sulfur trioxide and moisture and form sulfuric acid, so that sulfur trioxide is recycled.
Further, the flue gas register includes heat exchanger, frequency conversion air blower, furnace heater and chain control system
System, the heat exchanger, frequency conversion air blower, furnace heater be sequentially connected in series, the linkage control system respectively with heat exchanger, frequency conversion
Air blower is connected with furnace heater.
Further, deduster is bag filter in the step B.
Further, the mass concentration of sulfuric acid is 98% in the step C.
The present invention has the advantages that temperature control purification of the present invention for the flue gas during smelting of relieving haperacidity compared with the prior art
Method stablizes the temperature of Flue Gas of Nonferrous Smelting at 180 DEG C -230 DEG C, at this temperature in, sulfur trioxide and vapor will not be tied
Dew；Flow velocity of the flue gas in flue gas register is 1m/min-2.5m/min, and arsenic trioxide sublimates and is attached to soot dust granule
On, be conducive to remove together with flue dust, and recycle in a manner of solid, be generated without acidic arsenic-containing waste water；Then it is inhaled with the concentrated sulfuric acid
It receives the sulfur trioxide and moisture in flue gas during smelting and forms sulfuric acid, sulfur trioxide is enable to recycle.Present invention process is succinct, process
Controllably, stablize, arsenic trioxide depth is sublimated and is attached on soot dust granule, is conducive to return together with solid forms with flue dust
It receives, sulfur trioxide and vapor will not condense in flue gas, and can be absorbed by the concentrated sulfuric acid and form sulfuric acid product, dedusting of the present invention
High-efficient, good purification, has a good application prospect.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
The present invention is further explained in the light of specific embodiments.
Embodiment 1
Certain copper blast furnace off-gas, 75000 Nm of flue gas during smelting tolerance3/ h, 130 DEG C -350 DEG C of flue gas during smelting temperature, flue gas during smelting dioxy
Change sulphur concentration 5%-8%, flue gas impurity content such as table 1 before flue gas during smelting purifies.
Flue gas impurity content before 1 flue gas during smelting of table purifies
According to flue gas tolerance and heat exchanger heat exchange efficiency, 175 DEG C, flue gas flow rate 1.5m/min are dropped to from 360 DEG C by flue-gas temperature,
Setting heat exchanger area is 100m2, setting furnace heater power is 1000KW, and frequency conversion air blower tolerance is 10000Nm3/h；
By import flue gas flue dust 3000mg/Nm3, exiting flue gas flue dust 1mg/Nm3, back-blowing bag filter filtrate area, which is arranged, is
3600m2；By import sulfur trioxide in flue gas 1%, import flue gas moisture 1%, exiting flue gas sulfur trioxide 0.005%, exiting flue gas water
Divide 0.001%, setting concentrated acid absorption tower is packed tower, and concentrated acid absorption tower diameter is 4 meters, and filler is ceramic ring, and packed height is
2.5 meters, setting high-temperature concentrated sulfuric acid pumps 1, and high-temperature concentrated sulfuric acid pump discharge is 300 m3/h。
The flue gas during smelting is subjected to temperature control purification, comprising the following steps:
A, regulate and control flue-gas temperature: so that Flue Gas of Nonferrous Smelting is passed through flue gas register, flue-gas temperature is adjusted to 180 DEG C -230
DEG C, flue gas register includes heat exchanger, frequency conversion air blower, furnace heater and linkage control system, heat exchanger, frequency conversion air blast
Mechanical, electrical stove heating device is sequentially connected in series, and linkage control system is connect with heat exchanger, frequency conversion air blower and furnace heater respectively.It changes
Hot device heat exchange mode are as follows: flue gas during smelting passes through out of Tube Sheet of Heat Exchanger, and outside air passes through between Tube Sheet of Heat Exchanger, when flue gas during smelting temperature
When degree is lower than 180 DEG C, linkage control system controls furnace heater starting, the blown air of frequency conversion air blower, through furnace heater
It after heating, is blown between Tube Sheet of Heat Exchanger, by indirect heat exchange, Flue Gas of Nonferrous Smelting temperature is raised to 180 DEG C or more；When coloured smelting
When refining flue-gas temperature higher than 230 DEG C, linkage control system controls furnace heater and closes, and the blown air of frequency conversion air blower is through electric furnace
Heater does not heat, and to cold wind is blown between Tube Sheet of Heat Exchanger, by indirect heat exchange, flue gas during smelting temperature is dropped to 230 DEG C or less.?
Under the conditions of 180 DEG C of -230 DEG C of temperature, sulfur trioxide and vapor will not condense, and flow velocity of the flue gas in flue gas register is
1m/min, arsenic trioxide are sublimated and are attached on soot dust granule.
B, 180 DEG C of -230 DEG C of flue gas during smeltings in step A dedusting arsenic removal: are passed through bag filter by keeping the temperature flue
In, keep dust of the bag filter temperature in 180 DEG C -230 DEG C, flue gas during smelting, the arsenic trioxide sublimated is by solid gas
Separating treatment is retained in bag filter, and the dirt containing arsenic powder being retained in bag filter is periodically discharged, and makees further recycling
Processing.
C, it absorbs sulfur trioxide and water: the flue gas during smelting after dedusting arsenic removal being passed through absorption tower, makes flue gas during smelting and quality
Concentration be 98% concentrated sulfuric acid counter current contacting, the concentrated sulfuric acid absorb flue gas during smelting in sulfur trioxide and moisture and form sulfuric acid, make three
Sulfur oxide is recycled.
Flue gas content such as table 2 after flue gas during smelting purification.
Flue gas content after the purification of 2 copper blast furnace off-gas of table
Embodiment 2
Certain nickel fibers flue gas, 200000 Nm of flue gas during smelting tolerance3/ h, 135 DEG C -380 DEG C of flue gas during smelting temperature, flue gas during smelting two
Sulfur oxide concentration 8%-10%, flue gas impurity content such as table 3 before flue gas during smelting purifies.
Flue gas impurity content before 3 nickel fibers gas cleaning of table
According to flue gas tolerance and heat exchanger heat exchange efficiency, 175 DEG C, flue gas flow rate 1.5m/min are dropped to from 390 DEG C by flue-gas temperature,
Setting heat exchanger area is 400m2, setting furnace heater power is 3000KW, and frequency conversion air blower tolerance is 40000Nm3/h；
By import flue gas flue dust 2500mg/Nm3, exiting flue gas flue dust 1mg/Nm3, back-blowing bag filter filtrate area, which is arranged, is
10000m2；By import sulfur trioxide in flue gas 0.3%, import flue gas moisture 1%, exiting flue gas sulfur trioxide 0.005%, exiting flue gas
Moisture 0.001%, setting concentrated acid absorption tower are packed tower, and concentrated acid absorption tower diameter is 6 meters, and filler is ceramic ring, and packed height is
2.5 meters, setting high-temperature concentrated sulfuric acid pumps 1, and high-temperature concentrated sulfuric acid pump discharge is 480m3/h。
The flue gas during smelting is subjected to temperature control purification, comprising the following steps:
A, regulate and control flue-gas temperature: so that Flue Gas of Nonferrous Smelting is passed through flue gas register, flue-gas temperature is adjusted to 180 DEG C -230
DEG C, flue gas register includes heat exchanger, frequency conversion air blower, furnace heater and linkage control system, heat exchanger, frequency conversion air blast
Mechanical, electrical stove heating device is sequentially connected in series, and linkage control system is connect with heat exchanger, frequency conversion air blower and furnace heater respectively.It changes
Hot device heat exchange mode are as follows: flue gas during smelting passes through out of Tube Sheet of Heat Exchanger, and outside air passes through between Tube Sheet of Heat Exchanger, when flue gas during smelting temperature
When degree is lower than 180 DEG C, linkage control system controls furnace heater starting, the blown air of frequency conversion air blower, through furnace heater
It after heating, is blown between Tube Sheet of Heat Exchanger, by indirect heat exchange, Flue Gas of Nonferrous Smelting temperature is raised to 180 DEG C or more；When coloured smelting
When refining flue-gas temperature higher than 230 DEG C, linkage control system controls furnace heater and closes, and the blown air of frequency conversion air blower is through electric furnace
Heater does not heat, and to cold wind is blown between Tube Sheet of Heat Exchanger, by indirect heat exchange, flue gas during smelting temperature is dropped to 230 DEG C or less.?
Under the conditions of 180 DEG C of -230 DEG C of temperature, sulfur trioxide and vapor will not condense, and flow velocity of the flue gas in flue gas register is
2.5m/min, arsenic trioxide are sublimated and are attached on soot dust granule.
B, 180 DEG C of -230 DEG C of flue gas during smeltings in step A dedusting arsenic removal: are passed through bag filter by keeping the temperature flue
In, keep dust of the bag filter temperature in 180 DEG C -230 DEG C, flue gas during smelting, the arsenic trioxide sublimated is by solid gas
Separating treatment is retained in bag filter, and the dirt containing arsenic powder being retained in bag filter is periodically discharged, and makees further recycling
Processing.
C, it absorbs sulfur trioxide and water: the flue gas during smelting after dedusting arsenic removal being passed through absorption tower, makes flue gas during smelting and quality
Concentration be 98% concentrated sulfuric acid counter current contacting, the concentrated sulfuric acid absorb flue gas during smelting in sulfur trioxide and moisture and form sulfuric acid, make three
Sulfur oxide is recycled.
Flue gas content such as table 4 after flue gas during smelting purification.
Flue gas content after 4 nickel fibers gas cleaning of table
Claims (4)
1. a kind of temperature control purification method of the flue gas during smelting for relieving haperacidity, it is characterised in that method includes the following steps:
A, regulate and control flue-gas temperature: so that Flue Gas of Nonferrous Smelting is passed through flue gas register, flue-gas temperature is adjusted to 180 DEG C -230
DEG C, at this temperature, sulfur trioxide and vapor will not condense, and flow velocity of the flue gas in flue gas register is 1m/min-
2.5m/min, arsenic trioxide are sublimated and are attached on soot dust granule；
B, dedusting arsenic removal: 180 DEG C of -230 DEG C of flue gas during smeltings in step A are passed through in deduster by keeping the temperature flue, keep removing
Dust of the dirt device temperature in 180 DEG C -230 DEG C, flue gas during smelting, the arsenic trioxide sublimated are retained in by solid gas separating treatment
In deduster, the flue gas during smelting dust-laden after dedusting arsenic removal is less than 5mg/Nm3, the dirt containing arsenic powder being retained in deduster periodically arranges
Out, make further recovery processing；
C, it absorbs sulfur trioxide and water: the flue gas during smelting after dedusting arsenic removal being passed through absorption tower, keeps flue gas during smelting inverse with the concentrated sulfuric acid
Stream contact, the concentrated sulfuric acid absorb flue gas during smelting in sulfur trioxide and moisture and form sulfuric acid, so that sulfur trioxide is recycled.
2. a kind of temperature control purification method of flue gas during smelting for relieving haperacidity according to claim 1, it is characterised in that: described
Flue gas register includes heat exchanger, frequency conversion air blower, furnace heater and linkage control system, the heat exchanger, frequency conversion drum
Blower, furnace heater are sequentially connected in series, and the linkage control system connects with heat exchanger, frequency conversion air blower and furnace heater respectively
It connects.
3. a kind of temperature control purification method of flue gas during smelting for relieving haperacidity according to claim 1, it is characterised in that: described
Deduster is bag filter in step B.
4. a kind of temperature control purification method of flue gas during smelting for relieving haperacidity according to claim 1, it is characterised in that: described
The mass concentration of sulfuric acid is 98% in step C.
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Cited By (2)
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| CN110282805A (en) * | 2019-07-22 | 2019-09-27 | 红河砷业有限责任公司 | A kind of method of comprehensive utilization of waste acid containing arsenic that flue gas during smelting generates |
| CN112370951A (en) * | 2020-09-10 | 2021-02-19 | 矿冶科技集团有限公司 | Method and system for removing arsenic from smelting flue gas by wet method |
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