CN106268179A - The energy saving technique of a kind of synthetical recovery sulfuric acid purification spent acid and system - Google Patents
The energy saving technique of a kind of synthetical recovery sulfuric acid purification spent acid and system Download PDFInfo
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- CN106268179A CN106268179A CN201610723207.0A CN201610723207A CN106268179A CN 106268179 A CN106268179 A CN 106268179A CN 201610723207 A CN201610723207 A CN 201610723207A CN 106268179 A CN106268179 A CN 106268179A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
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Abstract
The invention discloses the energy saving technique of a kind of synthetical recovery sulfuric acid purification spent acid: high-temperature flue gas is passed through one-level scrubbing tower；Acid pump at the bottom of tower inversely contacts the SO in absorption flue gas to the sour shower nozzle that goes out within one-level scrubbing tower admission line, acid solution with high-temperature flue gas3；The continuation cooling of follow-up conventional purge flow process is entered, the SO that the condensation diluted acid that follow-up cooling procedure produces returns in one-level scrubbing tower in maintenance tower after the flue gas cool-down of acid solution washing3And water balance；Heavy metal dirt and arsenic element in flue gas form sulfate and arsenious acid after acid solution is washed；Arsenious acid in acid solution is oxidized to arsenic acid by compressed air aerator；Acid solution containing arsenic acid and heavy metal hydrochlorate sends into cooling densifying tower；Cooling densifying tower concentrated acid out leaches heavy metal sulfate slag through slag filter, and filtrate enters SO2Reductive jar, is passed through highly concentrated SO in tank2Gas is reduced to be slightly soluble in the arsenious acid precipitation of sulphuric acid arsenic acid；Arsenious acid filter cake is obtained after acid solution solid-liquid separation containing arsenious acid precipitation.
Description
Technical field
The present invention relates to energy saving technique and the system of a kind of synthetical recovery sulfuric acid purification spent acid.
Background technology
In flue gas acid preparing technique, the spent acid of cleaning system is employing sulfuration alkaline agent or alkaline agent to it except weights such as As, Cu at present
Metal ion and neutralization Hou Zaijinquan factory sewage disposal system.Although having neutralized spent acid, being extracted As, Cu plasma, but produce
Give birth to a large amount of Gypsum Fibrosum containing heavy metal, it is virtually impossible to being used, long-term stacking causes again serious secondary pollution, processes again
Come abnormal thorny.
Titanium dioxide industry is it has been proposed that the mode that system spent acid carries out multiple-effect evaporation carries out enrichment recovery, but operates bar
Part is abnormal harsh.Because the Waste Sulfuric Acid concentration by about 10% is to more than 80%, the boiling point of sulphuric acid will be raised to more than 200 DEG C, right
On the one hand equipment selection harshness is, adds vapours and is necessary for middle pressure steam, and surprising consumption is also the weight that this technique cannot be promoted
Want reason.
It has been proposed that use the mode concentration spent acid of MVR engine driven supercharging., owing to sulphuric acid boiling point is with the dense lifting of acid
Dramatically increase.MVR system can only process the highest 20 DEG C of boiling points rise about solution, sulfuric acid concentration can only concentration to 48%, reclaim
The value utilized is little.On the other hand the electrical network electric energy expense that MVR consumes is the lowest, unless had private station, otherwise, and economy
Upper feasibility there is also problem.
Summary of the invention
It is contemplated that overcome the deficiencies in the prior art, it is provided that the energy saving technique of a kind of synthetical recovery sulfuric acid purification spent acid and
System.
In order to achieve the above object, the technical scheme that the present invention provides is:
The energy saving technique process of described synthetical recovery sulfuric acid purification spent acid is as follows:
The high-temperature flue gas of (1) 200 DEG C～300 DEG C is passed through one-level scrubbing tower；The cleaning circulation pump of one-level scrubbing tower is by one-level
Acid pump at the bottom of scrubbing tower tower is to the sour shower nozzle that goes out being arranged within one-level scrubbing tower admission line, with high temperature cigarette after acid solution ejection
QI rising in reverse order SO in contact, flue gas3Absorbed by acid solution；
(2) flue-gas temperature through the washing of one-level scrubbing tower acid solution enters follow-up conventional purge after being down to 70 DEG C～160 DEG C
Flow process continues cooling, maintains the SO in one-level scrubbing tower in the condensation diluted acid return one-level scrubbing tower that follow-up cooling procedure produces3
And water balance；
(3) the heavy metal dirt in flue gas and arsenic element form sulfate and arsenous in one-level scrubbing tower after acid solution is washed
Acid；Arsenious acid in acid solution is oxidized to arsenic acid by the compressed air aerator that one-level scrubbing tower intracavity bottom is arranged；
(4) acid solution containing arsenic acid and heavy metal hydrochlorate is arranged on sulphuric acid by washing delivery pump from one-level scrubbing tower feeding
Cooling densifying tower after drying and absorption process；The flue gas discharged after one-level scrubbing tower washs carries out secondary suction through sulphuric acid drying and absorption process
Receiving, the partial fume after sulphuric acid does suction is passed through acid solution concentration and the cooling to entering cooling densifying tower of the cooling densifying tower；
(5) cooling densifying tower flue gas out is discharged into tail suction desulfurization；Cooling densifying tower concentrated acid out is through acid sludge filter pump
Pump, to slag filter, leaches heavy metal sulfate slag, and filtrate enters SO2Reductive jar, by being passed through highly concentrated SO in tank2Gas handle
Arsenic acid is reduced to be slightly soluble in the arsenious acid precipitation of sulphuric acid, and residual gas is incorporated to antacid purifying smoke entrance；Precipitate containing arsenious acid
Acid solution to arsenic filter, carry out solid-liquid separation by arsenic filter pump pump, the clear acid after being filtered and arsenious acid filter cake；Sub-
Arsenic acid filter cake is collected after drying, obtains white arsenic product.
The energy conserving system of described synthetical recovery sulfuric acid purification spent acid includes one-level scrubbing tower；Described one-level scrubbing tower side sets
There is vertically arranged admission line；Described one-level scrubbing tower bottom is provided with recycle acid outlet, and cycles of washing is passed through in recycle acid outlet
Pump connects with the acid shower nozzle that goes out being arranged within admission line；Described one-level scrubbing tower top is provided with exhanst gas outlet, exhanst gas outlet
Connect with conventional purge flow system；One-level scrubbing tower intracavity bottom is provided with compressed air aerator；Described one-level scrubbing tower
Bottom is additionally provided with acid solution outlet, and acid solution outlet is connected with cooling densifying tower by washing delivery pump；Described cooling densifying tower and sulfur
Acid drying and absorption process system connectivity；Described cooling densifying tower bottom is provided with acid sludge outlet, and acid sludge exports by acid sludge filter pump and slag
Filter connects；Slag filter and SO2Reductive jar connects；SO2Reductive jar is connected with arsenic filter by arsenic filter pump.
Wherein, described one-level scrubbing tower is provided with multiple times sour entrances.Described cooling densifying tower bottom acid outlet and enrichment
Pump entry connects, and enrichment circulating-pump outlet connects with cooling densifying tower top.Described arsenic filter is with pneumatic conveyer dryer even
Logical；Described pneumatic conveyer dryer is received arsenic device with cloth bag and is connected.
The invention will be further described below:
Concrete technology flow process of the present invention is as follows:
The high-temperature flue gas of 200 DEG C～300 DEG C is introduced in purification one-level scrubbing tower (this tower high temperature resistant peracid of energy), purifies one
Level scrubbing tower is provided with cleaning circulation pump, and acid solution at the bottom of tower is squeezed into scrubbing tower shower nozzle, and acid solution inversely contacts with high-temperature flue gas fills
The mass-and heat-transfer divided.SO in flue gas3Absorbed by recycle acid, purify two grades of washings, electricity except mist condensation diluted acid all fill into one-level
Scrubbing tower, for the acid in holding scrubbing tower, dense stable and water balance, should arrange a regulation valve dense according to the recycle acid in scrubbing tower
Degree controls the output of the cold diluted acid of Clean room, discharges diluted acid entrance sewage workshop and is neutralized process.Scrubbing tower recycle acid is dense
Can be arbitrary value between 10%～80% (w%), be specifically controlled as requested by aforementioned regulation valve.Flue gas washs through one-level
Tower height temperature acid elution, temperature is down to 70 DEG C～160 DEG C (concrete numerical value will provide in an embodiment), is entered back into follow-up conventional purge
Flow process continues cooling, maintains the SO in one-level scrubbing tower in the condensation diluted acid return one-level scrubbing tower that follow-up cooling procedure produces3
And water balance.The elements such as heavy metal dirt in flue gas and arsenic enter solution through pickling in one-level scrubbing tower, formed sulfate and
Arsenious acid.It is provided with compressed air aerator in one-level wash tower bottoms, arsenious acid less for dissolubility in acid solution is oxidized to
The arsenic acid that dissolubility is bigger, is completely dissolved in sulfuric acid solution.High-temperature acid containing arsenic acid and heavy metal hydrochlorate is carried by washing
Pump is squeezed into from one-level scrubbing tower and is arranged on sulphuric acid and does the cooling densifying tower after suction.By the flue gas extension after double absorption
It is passed through in cooling densifying tower and the high-temperature acid entering tower is carried out again concentration and lowers the temperature (such as: can by the exhaust gas volumn required for calculating
To carry to 93% dense for acid in densifying tower, reach directly to produce the purpose of string acid to dry suction).Acid Wen Ze is reduced to close to entering tower cigarette
Temperature (65 DEG C～80 DEG C) is discharged into tail and inhales desulfurization.The relatively low temperature reaching to set concentration contains the concentrated acid of crystal precipitation by acid
Slag filter pump is squeezed into slag filter and is leached heavy metal sulfate slag, and filtrate enters SO2Reductive jar, by being passed through highly concentrated SO in tank2
Gas is reduced to be slightly soluble in the arsenious acid precipitation of sulphuric acid arsenic acid, and residual gas is incorporated to antacid purifying smoke entrance.Containing arsenous
The Calyx seu fructus physalis of Acid precipitation squeezes into arsenic filter solid-liquid separation by arsenic filter pump.The clear acid of 93% be filtrated to get is sent to dry absorption section and is followed
Naphthenic acid groove is as moisturizing and produces acid.The arsenious acid filter cake of output is then first passed through hot-air in pneumatic conveyer dryer and agitates dry.Weight
Granule falls into and is collected at the bottom of tower, and light granule enters cloth bag receipts arsenic device with dry gas and removes down further.The white arsenic collected is made
For selling outside qualified products.Dry flue gas containing micro amount of arsenic is then incorporated to antacid purifying smoke entrance circulation and stress.
Compared with prior art, the invention have the characteristics that
1, this technique is not on the premise of increasing any external evaporation energy consumption (steam, electricity etc.), utilizes and smelts 250 produced
～300 DEG C of high-temperature flue gas are as the evaporation thermal source of spent acid concentration.Only by changing the pickling of sulfuric acid purification operation one-level scrubbing tower
Pattern (makes purification one-level Diluted Acid Washing temperature reduction technology into concentrated acid cleaning dust technique), so that it may by purification acid-spending strength concentration to connecing
Nearly 80%, then a densifying tower is set after sulphuric acid dry absorption section, utilize the low temperature dry flue gas after antacid double absorption one-level
The high temperature spent acid that scrubbing tower is discharged proposes step concentration and a cooling.Finally low temperature height concentrated acid filtering heavy metal salt, clear liquid are carried arsenic,
Dry absorption section can be sent into about 90% clear acid and replace part system moisturizing.Operating cost is at a fairly low, is particularly adapted to existing smelting
The upgrading of refining flue gas acid preparing factory and transformation.
2, in this technique the design concentration of one-level scrubbing tower recycle acid with less than 80% preferably (but, if import flue gas
Water content is little, it is also possible to the design concentration of recycle acid is promoted to more than 80%, and even 90%).Need to be at one-level scrubbing tower
Solution district, bottom be provided with compressed air aerator (note: compressed air must be the pressure 0.6MPa that obtains with air compressor machine with
Upper compressed air.Unavailable Roots blower replaces, because in its gas, water content is the highest), by Asia less for dissolubility in solution
Arsenic acid is oxidized to the arsenic acid that dissolubility is bigger.
3, the conventional purge flow process after this technique varies without one-level scrubbing tower.According to the difference of flue gas condition, should
Problem of both noting: one, when entering before cleaning system SO in flue gas2With H2Volume ratio V of OSO2: VH2O≥Time, illustrate in flue gas that moisture is not only able to meet follow-up 98% acid and produces, and cleaning system
Any acid waste water can not be discharged while the highly concentrated waste acid of concentration.Two, V is worked asSO2: VH2O＜
Time, illustrate that in addition to maintaining the dry water yield inhaling production 98% acid balance, cleaning system need to remove more than V containing water excess in flue gasSO2
The steam of volume.This is the most in two kinds of situation: (1) is if beyond VSO2The steam vapour amount of volume and the V in purifying smokeSO3Body
Accumulated amount is suitable, then cleaning system can not discharge any acid waste water；(2) if the SO in flue gas3It is not enough to and exceeds VSO2Volume
Steam make the one-level scrubbing tower recycle acid of setting dense (such as 80% acid), then purification section whole cannot be condensed dilute
Acid fills in one-level scrubbing tower, gesture necessary loss, discharges Partial cleansing cold diluted acid decontaminated water and processes workshop section and neutralize.Although such as
This, SO in flue gas3Maximum loss be not more than the 30% of total amount.
4, the high-temperature acid of one-level scrubbing tower is sent to densifying tower by the delivery pump of high silicon iron (or high silicon stainless steel) material and enters
Row cooling concentration.After densifying tower should be arranged on the final double absorption of sulphuric acid.It is that 80% (quality is dense when the acid entering densifying tower is dense
Degree) time, owing to two inhale the water vapor pressure ＜ 1Pa in rear 70 DEG C of flue gases, 80% acid saturated vapor pressure～500Pa, with 80% acid with
After two suctions, smoke contacts can make 80% acid concentration continue raising, temperature continues to reduce.As a example by concentration to 93% acid, because two suctions follow
Naphthenic acid is 98% acid, and the saturated vapor pressure in its corresponding exiting flue gas is less than 93% sour water vapour pressure, Gu with 93% acid for following
Naphthenic acid then can also continue to increase the moisture content in gas phase so that it is water vapor pressure reaches the saturated vapor pressure of 93% acid, thus reaches handle
Acid is concentrated into the purpose of 93% further from 80%.The exhaust gas volumn size of required cooling should be by the gas-liquid of the dense correspondence of recycle acid in tower
Balance and system heat balance are calculated.It is said that in general, required exhaust gas volumn can be less than double absorption whole exhaust gas volumns out, institute
This concentration tower is entered with flue gas after taking part double absorption.
5, under concentrated acid, the dissolubility of various heavy metal sulfates is the lowest, the most all can crystallization, therefore, from cooling increase
The concentrated acid of dense tower output can directly filter separation.Containing a small amount of concentrated acid (93%) to cast iron corruption in the heavy metal sulfate filtered out
Erosion property is less, can usual manner transport.
6, filter in the sulphuric acid after acid sludge containing arsenic acid, be passed through SO2Gas carries out reaction reduction, regenerates arsenious acid micro-
Insoluble precipitate.The most again filter separation, filtration cakes torrefaction is obtained white arsenic product, filter gained acid clearly and fill into sulphuric acid dry suction product
String acid.
Accompanying drawing explanation
Fig. 1 is the energy conserving system structural representation of synthetical recovery sulfuric acid purification spent acid of the present invention.
In figure: 1, one-level scrubbing tower；2, admission line；3, acid shower nozzle is gone out；4, compressed air aerator；5, washing conveying
Pump；6, cooling densifying tower；7, acid sludge filter pump；8, slag filter；9、SO2Reductive jar；10, arsenic filter pump；11, arsenic filter；
12, acid entrance is returned；13, enrichment circulating pump；14, pneumatic conveyer dryer；15, arsenic device received by cloth bag.
Detailed description of the invention
Embodiment 1
Described energy conserving system includes one-level scrubbing tower 1；Described one-level scrubbing tower 1 side is provided with vertically arranged admission line
2；Described one-level scrubbing tower 1 bottom be provided with recycle acid outlet, recycle acid outlet by cleaning circulation pump be arranged on admission line 2
The internal acid shower nozzle 3 that goes out connects；Described one-level scrubbing tower 1 top is provided with exhanst gas outlet, exhanst gas outlet and conventional purge flow process system
System connection；One-level scrubbing tower 1 intracavity bottom is provided with compressed air aerator 4；Described one-level scrubbing tower 1 bottom is additionally provided with acid solution
Outlet, acid solution outlet is connected with cooling densifying tower 6 by washing delivery pump 5；Described cooling densifying tower 6 and sulphuric acid drying and absorption process system
System connection；Described cooling densifying tower 6 bottom is provided with acid sludge outlet, and acid sludge outlet is by acid sludge filter pump 7 with slag filter 8 even
Logical；Slag filter 8 and SO2Reductive jar 9 connects；SO2Reductive jar 9 is connected with arsenic filter 11 by arsenic filter pump 10.
Wherein, described one-level scrubbing tower 1 is provided with multiple times sour entrances 12.Described cooling densifying tower 6 bottom acid outlet with
Enrichment circulating pump 13 entrance connects, and enrichment circulating pump 13 outlet connects with cooling densifying tower 6 top.Described arsenic filter 11 and gas
Flash dryer 14 connects；Described pneumatic conveyer dryer 14 is received arsenic device 15 with cloth bag and is connected.
Case history:
1, containing H2O is 5%, SO2Concentration ＞ 5%, SO3Concentration is 0.2%, and temperature is that the flue gas during smelting of 300 DEG C enters one-level
Scrubbing tower, with the acid solution counter current contacting squeezed into from cycles of washing acid pump mass-and heat-transfer occurs.Recycle acid temperature is 147 DEG C, and acid is dense
Degree is 80%.The SO of 30% in flue gas3It is directly entered in cycles of washing acid solution, remaining 70%SO3Follow-up tradition is entered with flue gas
Cleaning equipment, and all return in one-level scrubbing tower with the form of condensation diluted acid, whole SO in recovered flue gas3Composition, does not now have
Have outside any diluted acid and arrange.According to the water balance in scrubbing tower, a small amount of new water should be supplemented in scrubbing tower and be used for maintaining in tower 80%
The concentration of acid.Flue gas washs through one-level scrubbing tower high-temperature acid, and temperature is down to 149 DEG C, is entered back into follow-up conventional purge flow process and continue
Continuous cooling.The elements such as heavy metal dirt in flue gas and arsenic enter solution through pickling in one-level scrubbing tower, form sulfate and Asia
Arsenic acid.It is provided with compressed air aerator in one-level wash tower bottoms, arsenious acid less for dissolubility in acid solution is oxidized to molten
The arsenic acid that Xie Du is bigger.High-temperature sulfuric acid containing arsenic acid and heavy metal hydrochlorate is squeezed into by washing delivery pump and is arranged on the dry suction of sulphuric acid
Cooling densifying tower afterwards.Flue gas extension after double absorption is passed through in cooling densifying tower entering the high-temperature acid of tower again
Concentration is to 90% and is cooled to 73 DEG C, and densifying tower flue gas out is discharged into tail and inhales desulfurization.The Calyx seu fructus physalis of cooling densifying tower is by slag mistake
Filter pump is squeezed into slag filter and is leached heavy metal sulfate slag, and filtrate enters SO2Reductive jar.By being passed through highly concentrated SO in tank2Gas
Arsenic acid is reduced to be slightly soluble in the arsenious acid precipitation of sulphuric acid, and residual gas is incorporated to antacid purifying smoke entrance.Sink containing arsenious acid
The Calyx seu fructus physalis formed sediment squeezes into solid-liquid separation in arsenic filter by arsenic filter pump.Dry absorption section circulation is sent in the clear acid of 90% be filtrated to get
Acid tank is as moisturizing and produces acid.The arsenious acid filter cake of output is then first passed through hot-air in pneumatic conveyer dryer and agitates dry.Weight
Grain falls into and is collected at the bottom of tower, and light granule enters cloth bag receipts arsenic device with dry gas and removes down further.The white arsenic collected i.e. is made
For selling outside qualified products.
2, containing H2O is 10%, SO2Concentration ＜ 10%, SO3Concentration is 0.2%, and temperature is that the flue gas during smelting of 300 DEG C enters one
Level scrubbing tower, with the acid solution counter current contacting squeezed into from cycles of washing acid pump mass-and heat-transfer occurs.The SO of 30% in flue gas3Enter
In cycles of washing acid solution, remaining 70%SO3Follow-up conventional purification apparatus is entered, owing to system is containing water excess with flue gas, it is impossible to
Subsequent condensation diluted acid is all filled into one-level scrubbing tower, therefore a regulation valve is set and controls according to recycle acid concentration in scrubbing tower
The output of the cold diluted acid of Clean room.Discharge diluted acid and enter sewage workshop neutralisation treatment, dense with recycle acid in keeping one-level scrubbing tower
Being 80%, acid temperature is 155 DEG C.Flue gas washs through one-level scrubbing tower high-temperature acid, and temperature is down to 157 DEG C, is entered follow-up tradition clean
Change flow process and continue cooling.The elements such as heavy metal dirt in flue gas and arsenic enter solution through pickling in one-level scrubbing tower, form sulfur
Hydrochlorate and arsenious acid.It is provided with compressed air aerator, by arsenious acid less for dissolubility in acid solution in one-level wash tower bottoms
It is oxidized to the arsenic acid that dissolubility is bigger.High-temperature sulfuric acid containing arsenic acid and heavy metal hydrochlorate is squeezed into by washing delivery pump and is arranged on
Sulphuric acid does the cooling densifying tower after suction.Flue gas extension after double absorption is passed through in cooling densifying tower entering tower height temperature
Acid concentration again is to 90% and is cooled to 73 DEG C, and densifying tower flue gas out is discharged into tail and inhales desulfurization.The Calyx seu fructus physalis of cooling densifying tower is led to
Crossing slag filter pump to squeeze into slag filter and leach heavy metal sulfate slag, filtrate enters SO2Reductive jar.Highly concentrated by being passed through in tank
SO2Gas is reduced to be slightly soluble in the arsenious acid precipitation of sulphuric acid arsenic acid, and residual gas is incorporated to antacid purifying smoke entrance.Containing Asia
The Calyx seu fructus physalis of arsenic acid precipitation squeezes into solid-liquid separation in arsenic filter by arsenic filter pump.Dry suction work is sent in the clear acid of 90% be filtrated to get
Duan Xunhuan acid tank is as moisturizing and produces acid.The arsenious acid filter cake of output is then first passed through hot-air in pneumatic conveyer dryer and agitates dry
Dry.Weight granule falls into and is collected at the bottom of tower, and light granule enters cloth bag receipts arsenic device with dry gas and removes down further.That collects is white
Arsenic is i.e. sold as outside qualified products.
3, for not losing completeness, the embodiment data of this technique one-level scrubbing tower and cooling densifying tower can be also following multiple
Situation, but it is not limited to situations below (table 1).
Table 1
Claims (5)
1. the energy saving technique of a synthetical recovery sulfuric acid purification spent acid, it is characterised in that described technical process is as follows:
The high-temperature flue gas of (1) 200 DEG C～300 DEG C is passed through one-level scrubbing tower；One-level is washed by the cleaning circulation pump of one-level scrubbing tower
Acid pump at the bottom of tower tower is to the sour shower nozzle that goes out being arranged within one-level scrubbing tower admission line, inverse with high-temperature flue gas after acid solution ejection
SO in contact, flue gas3Absorbed by acid solution；
(2) flue-gas temperature through the washing of one-level scrubbing tower acid solution enters follow-up conventional purge flow process after being down to 70 DEG C～160 DEG C
Continue cooling, the condensation diluted acid return one-level scrubbing tower that follow-up cooling procedure produces maintains the SO in one-level scrubbing tower3And water
Balance；
(3) the heavy metal dirt in flue gas and arsenic element form sulfate and arsenious acid in one-level scrubbing tower after acid solution is washed；
Arsenious acid in acid solution is oxidized to arsenic acid by the compressed air aerator that one-level scrubbing tower intracavity bottom is arranged；
(4) acid solution containing arsenic acid and heavy metal hydrochlorate is arranged on the dry suction of sulphuric acid by washing delivery pump from one-level scrubbing tower feeding
Cooling densifying tower after flow process；The flue gas discharged after one-level scrubbing tower washs carries out double absorption through sulphuric acid drying and absorption process,
Partial fume after sulphuric acid does suction is passed through acid solution concentration and the cooling to entering cooling densifying tower of the cooling densifying tower；
(5) cooling densifying tower flue gas out is discharged into tail suction desulfurization；Cooling densifying tower concentrated acid out is through acid sludge filter pump pump extremely
Slag filter, leaches heavy metal sulfate slag, and filtrate enters SO2Reductive jar, by being passed through highly concentrated SO in tank2Gas is arsenic acid
Being reduced to be slightly soluble in the arsenious acid precipitation of sulphuric acid, residual gas is incorporated to antacid purifying smoke entrance；Acid containing arsenious acid precipitation
Liquid carries out solid-liquid separation by arsenic filter pump pump to arsenic filter, the clear acid after being filtered and arsenious acid filter cake；Arsenious acid
Filter cake is collected after drying, obtains white arsenic product.
2. the energy conserving system of a synthetical recovery sulfuric acid purification spent acid, it is characterised in that described energy conserving system includes that one-level is washed
Tower (1)；Described one-level scrubbing tower (1) side is provided with vertically arranged admission line (2)；Described one-level scrubbing tower (1) bottom sets
Having recycle acid to export, recycle acid outlet is connected by acid shower nozzle (3) that goes out that cleaning circulation pump is internal with being arranged on admission line (2)
Logical；Described one-level scrubbing tower (1) top is provided with exhanst gas outlet, and exhanst gas outlet connects with conventional purge flow system；One-level is washed
Tower (1) intracavity bottom is provided with compressed air aerator (4)；Described one-level scrubbing tower (1) bottom is additionally provided with acid solution outlet, acid solution
Export and connected with cooling densifying tower (6) by washing delivery pump (5)；Described cooling densifying tower (6) and sulphuric acid drying and absorption process system
Connection；Described cooling densifying tower (6) bottom is provided with acid sludge outlet, and acid sludge outlet is by acid sludge filter pump (7) and slag filter (8)
Connection；Slag filter (8) and SO2Reductive jar (9) connects；SO2Reductive jar (9) is by arsenic filter pump (10) and arsenic filter (11)
Connection.
3. energy conserving system as claimed in claim 2, it is characterised in that described one-level scrubbing tower (1) is provided with multiple times acid and enters
Mouth (12).
4. energy conserving system as claimed in claim 2, it is characterised in that described cooling densifying tower (6) bottom acid outlet and enrichment
Circulating pump (13) entrance connects, and enrichment circulating pump (13) exports and cools down densifying tower (6) top and connect.
5. energy conserving system as claimed in claim 2, it is characterised in that described arsenic filter (11) is with pneumatic conveyer dryer (14) even
Logical；Described pneumatic conveyer dryer (14) is received arsenic device (15) with cloth bag and is connected.
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