CN107188143A - A kind of Wet Phosphoric Acid Concentration Plant and its technique - Google Patents
A kind of Wet Phosphoric Acid Concentration Plant and its technique Download PDFInfo
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- CN107188143A CN107188143A CN201710264353.6A CN201710264353A CN107188143A CN 107188143 A CN107188143 A CN 107188143A CN 201710264353 A CN201710264353 A CN 201710264353A CN 107188143 A CN107188143 A CN 107188143A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/234—Purification; Stabilisation; Concentration
- C01B25/2343—Concentration concomitant with purification, e.g. elimination of fluorine
- C01B25/2346—Concentration
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- C—CHEMISTRY; METALLURGY
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- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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Abstract
The invention discloses a kind of Wet Phosphoric Acid Concentration Plant and its technique, including phosphoric acid,diluted storage tank, graphite heat exchanger, flash chamber, forced circulation pump, demister, barometric condenser；The material liquid outlet of phosphoric acid,diluted storage tank and the material liquid outlet of graphite heat exchanger are connected with the feed liquid port of flash chamber respectively；Graphite heat exchanger is provided with low-pressure steam inlet port；The material liquid outlet of flash chamber is connected with the entrance of forced circulation pump, and the recycle acid outlet of forced circulation pump is connected with the feed liquid port of graphite heat exchanger, and forced circulation pump loop bottom is exported provided with concentrated phosphoric acid；The steam (vapor) outlet of flash chamber is connected with the entrance of demister；The acid solution outlet of demister is connected with the entrance of forced circulation pump；The gaseous phase outlet of demister is connected with the entrance of barometric condenser.The wet-process phosphoric acid concentration technique of the present invention, can fully improve the solubility of phosphoric acid, reduce the viscosity of phosphoric acid so that the concentration process of phosphoric acid is easier to carry out, and its effect is more excellent than traditional phosphoric acid by wet process effect.
Description
Technical field
The invention belongs to wet-process phosphoric acid concentration technical field, more particularly, to a kind of Wet Phosphoric Acid Concentration Plant and its
Technique.
Background technology
The utilization of the valuable phosphate rock resource of China turns to lean ore from exploitation rich ore, to greatest extent, reasonably to utilize
This valuable resource of good phosphorus ore, phosphoric acid by wet process is due to being by reacting generation phosphoric acid so as to realize utilization directly from rock phosphate in powder
The purpose of phosphor resource, therefore this method is the direction of Future Development in the long run.
Wet Processes of Phosphoric Acid principle and method produce obtained phosphoric acid using two water laws, and its mass fraction only has 28% left side
The right side, and when producing Diammonium phosphate (DAP), the mass fraction requirement of phosphoric acid is more than 48%, therefore phosphoric acid,diluted must pass through concentration.
The concentration of phosphoric acid is considered as a kind of difficult operation, because containing about 2% H in phosphoric acid by wet process2SO4About 2%
H2SIF6, with very strong corrosivity, while during concentration is heated, in satiety and/or saturation state in phosphoric acid,diluted
Impurity, separated out with the continuous rise of phosphoric acid concentration, and be deposited on wall surface, additionally there are waste gas in concentration process
Process problem.The method of the concentration of phosphoric acid can be divided into two classes with its mode of heating, that is, directly heat and indirectly heat evaporation.Directly
Connect heating evaporation：It is that simplest mode is concentrated to directly heat evaporation, and phosphoric acid is directly contacted with hot gas, with regard to its equipment
Speech, the caused corrosion of intermediate heat evaporation and scale problems can be overcome by directly heating evaporation, be widely used in Phosphoric Acid Concentration
Direct heater have bubbling concentration flow path evaporator with submerged combustion and wet wall evaporator etc..But at past twenties years
In, the use of this kind of device has been gradually reduced, and mainly fuel cost is too high and does not reach the waste gas emission standard of environmental requirement.
Indirectly heat is evaporated：Indirectly heat evaporation is that heating steam is conducted heat by heat transfer medium (tube wall of such as tubulation) to phosphoric acid, due to
During Phosphoric Acid Concentration, with P2O5Concentration raising, sludge fouling and equipment and pipeline corrosion problem on heating surface can direct shadows
Ring heat transfer property and structural material.Being widely used in the indirect heater of Phosphoric Acid Concentration has forced circulation to be evaporated in vacuo tubulation heat exchange
Device.Phosphoric acid by wet process is concentrated using steam indirectly heat, and the mass fraction of phosphoric acid is in 0-75%P2O5When, it seethes with excitement in balance gas phase
Vapor is only existed, in theory can be by Phosphoric Acid Concentration to very high concentration, but with the raising of phosphoric acid concentration, while phosphoric acid,diluted
Some impurity compositions are because solubility is reduced and separates out precipitation in solution, and as a result the viscosity of phosphoric acid rises, and become phosphoric acid operation
It is highly difficult.In actual production, phosphoric acid viscosity rises to more than 70MPA.S, and concentration operation is difficult to carry out.
The content of the invention
For problems of the prior art, it is an object of the invention to provide a kind of Wet Phosphoric Acid Concentration Plant and its
Technique, to solve that the technical problem that concentrates can be difficult to because viscosity is larger during Phosphoric Acid Concentration in the prior art.
To achieve the above object, a kind of Wet Phosphoric Acid Concentration Plant of the invention, including the heat exchange of phosphoric acid,diluted storage tank, graphite
Device, flash chamber, forced circulation pump, demister, barometric condenser；The material liquid outlet of the phosphoric acid,diluted storage tank and graphite heat exchanger
Material liquid outlet is connected with the feed liquid port of flash chamber respectively；The graphite heat exchanger is provided with low-pressure steam inlet port；It is described to dodge
The material liquid outlet of steam room is connected with the entrance of forced circulation pump, and recycle acid outlet and the graphite of the forced circulation pump exchange heat
The feed liquid port of device is connected, and the forced circulation pump loop bottom is exported provided with concentrated phosphoric acid；
The steam (vapor) outlet of the flash chamber is connected with the entrance of demister；
The acid solution outlet of the demister is connected with the entrance of forced circulation pump；The gaseous phase outlet and air of the demister
The entrance of condenser is connected.
A kind of wet-process phosphoric acid concentration technique of the present invention, using Wet Phosphoric Acid Concentration Plant as described above, including such as
Lower step：
Step (1)：The phosphoric acid,diluted raw material being stored in phosphoric acid,diluted storage tank is discharged into sudden strain of a muscle by the material liquid outlet of phosphoric acid,diluted storage tank
Low-pressure steam is passed through in steam room, in graphite heat exchanger to heat recycle acid, then is discharged into by the material liquid outlet of graphite heat exchanger
Mix to be incorporated in be evaporated in flash chamber with phosphoric acid,diluted into flash chamber and be condensed into concentrated phosphoric acid；
Step (2)：The concentrated phosphoric acid is entered in forced circulation pump by the material liquid outlet of flash chamber, and part concentrated phosphoric acid is by forcing
The concentrated phosphoric acid outlet discharge of circulating pump bottom loop, is delivered in concentrated phosphoric acid storage tank by concentrated phosphoric acid pump and stored；Most of dense phosphorus
Acid is delivered to formation circulation loop in graphite heat exchanger by forced circulation pump as recycle acid and continues cycling through concentration；Graphite exchanges heat
Condensate liquid is discharged into condensate liquid holding tank in device；
Step (3)：Contain fluoride and phosphoric acid mist in the vapor evaporated in the flash chamber, vapor is by flash chamber
Steam (vapor) outlet be discharged into demister separate vapor in phosphoric acid mist, phosphoric acid mist by the acid solution of demister export into
Enter and concentration is continued cycling through in forced circulation pump, gas is entered to condense in barometric condenser by the gaseous phase outlet of demister to be reclaimed.
The beneficial effects of the present invention are：The present invention wet-process phosphoric acid concentration technique using graphite heat exchanger, flash chamber and
Forced circulation pump formation concentration loop, and it is low-pressure steam that 0.29-0.31MPa, temperature are 135-140 DEG C to following to use pressure
Phosphoric acid in loop back path is heated, and is evaporated concentration in the environment of vacuum is 65-70KPa, when phosphoric acid is in concentration
During mass concentration become larger, low-pressure steam can fully improve the solubility of phosphoric acid, reduce the viscosity of phosphoric acid so that phosphoric acid
Concentration process be easier to carry out, its effect is more excellent than traditional phosphoric acid by wet process effect, and the mass concentration of its finished product is dense up to 48%
The yield of phosphoric acid improves 20% or so compared with existing, reduces the loss late of phosphoric acid by wet process.
Brief description of the drawings
The present invention is further explained below in conjunction with the drawings and specific embodiments.
Fig. 1 is the phosphoric acid by wet process waste gas recovering device structural representation of the present invention；
Wherein, phosphoric acid,diluted storage tank 1, graphite heat exchanger 2, flash chamber 3, forced circulation pump 4, demister 5, barometric condenser 6,
Concentrated phosphoric acid pump 7, phosphoric acid,diluted pump 8, washing liquid pump 9, condensate pump 10, vavuum pump 11, condensate liquid holding tank 12.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention will be described in detail, the description of this part be only it is exemplary and
It is explanatory, there should not be any restriction effect to protection scope of the present invention.
As shown in figure 1, a kind of Wet Phosphoric Acid Concentration Plant, including it is phosphoric acid,diluted storage tank 1, graphite heat exchanger 2, flash chamber 3, strong
Circulating pump 4 processed, demister 5, barometric condenser 6；The material liquid outlet of the phosphoric acid,diluted storage tank 1 and the feed liquid of graphite heat exchanger 2 go out
Feed liquid port of the mouth respectively with flash chamber 3 is connected；The graphite heat exchanger 2 is provided with low-pressure steam inlet port；The flash chamber 3
Material liquid outlet be connected with the entrance of forced circulation pump 4, the outlet of the recycle acid of the forced circulation pump 4 and the graphite heat exchanger
2 feed liquid port is connected, and the loop bottom of forced circulation pump 4 is exported provided with concentrated phosphoric acid；The steam (vapor) outlet of the flash chamber 3 with
The entrance of demister 5 is connected；The acid solution outlet of the demister 5 is connected with the entrance of forced circulation pump 4；The demister 5
Gaseous phase outlet is connected with the entrance of barometric condenser.
Further, the concentrated phosphoric acid outlet of the loop bottom of forced circulation pump 4 passes through concentrated phosphoric acid pump 7 and concentrated phosphoric acid storage tank
It is connected；The material liquid outlet of the phosphoric acid,diluted storage tank 1 is connected by phosphoric acid,diluted pump 8 with the feed liquid port of flash chamber 3.
Further, washing liquid pump 9 is additionally provided between the forced circulation pump 4 and graphite heat exchanger 2.
Further, the bottom of the graphite heat exchanger 2 is provided with condensate outlet, and the condensate outlet is deposited with condensate liquid
Storage tank 12 is connected, and condensate liquid is delivered to by condensate pump 10 in the deoxygenation water tank in desalted water workshop in condensate liquid holding tank 12, returns
Receive and utilize.
Further, the condensate outlet of the barometric condenser 6 is connected with vavuum pump 11.
Further, between the graphite heat exchanger 2 and flash chamber 3, flash chamber 3 and forced circulation pump 4, forced circulation pump
Connected between 4 and graphite heat exchanger 2 by 2205 duplex phase stainless tubes.The flash chamber 3 is between barometric condenser 6
Equipment is connected by DN1600mm steel lining plastic pipe.Existing Phosphoric Acid Concentration acid circulation system liquid pipe is carbon steel line with rubber
Often occurs the phenomenon of carbon steel rubber lined pipe leakage when pipeline, concentration infusion and driving, system after leakage occur must parking area
Reason, it is larger to concentration Influence of production, in order to ensure Phosphoric Acid Concentration acid circulation system infusion effect, concentration driving rate is improved, by stone
The liquid pipe of the concentration acid circulation system of black heat exchanger 2, flash chamber 3 and the formation of forced circulation pump 4 uses caliber
DN1600mm 2205 duplex phase stainless tubes.Liquid-phase tube between graphite heat exchanger 2, condensate liquid storage tank 4 and condensate pump 10
Road uses caliber DN1400mm 2205 duplex phase stainless tubes.
A kind of wet-process phosphoric acid concentration technique, using Wet Phosphoric Acid Concentration Plant as described above, comprises the following steps：
Step (1)：The phosphoric acid,diluted raw material being stored in phosphoric acid,diluted storage tank 1 by the material liquid outlet of phosphoric acid,diluted storage tank 1 be discharged into
Low-pressure steam is passed through in flash chamber 3, in graphite heat exchanger 2 to heat recycle acid, then by the material liquid outlet of graphite heat exchanger 2
It is discharged into flash chamber 3 to mix to be incorporated in be evaporated in flash chamber 3 with phosphoric acid,diluted and is condensed into concentrated phosphoric acid；
Step (2)：The concentrated phosphoric acid is entered in forced circulation pump 4 by the material liquid outlet of flash chamber 3, and part concentrated phosphoric acid is by strong
The concentrated phosphoric acid outlet discharge of the bottom loop of circulating pump 4 processed, is delivered in concentrated phosphoric acid storage tank by concentrated phosphoric acid pump 7 and stored；It is most of
Concentrated phosphoric acid is delivered to formation circulation loop in graphite heat exchanger 2 by forced circulation pump 4 as recycle acid and continues cycling through concentration；Stone
Condensate liquid is discharged into condensate liquid holding tank 12 in black heat exchanger 2, and is delivered to by condensate pump 10 deoxygenation in desalted water workshop
Recycled in water tank；Phosphoric acid concentration after concentration is 48% or so, and the phosphoric acid sludge containing 8-10% need to be clarified,
Concentrated phosphoric acid after clarification send two ammonium workshops, and sludge is expelled to reactive tank circulating filtration from concentrated phosphoric acid sump bottom.
Step (3)：Contain fluoride and phosphoric acid mist in the vapor evaporated in the flash chamber 3, vapor is by flashing
The steam (vapor) outlet of room 3 be discharged into demister 5 separate vapor in phosphoric acid mist, phosphoric acid mist by demister 5 acid solution
Outlet, which enters in forced circulation pump 4, continues cycling through concentration, and fluoride gas enter barometric condenser by the gaseous phase outlet of demister 5
Middle condensation is reclaimed, and the barometric condenser 6 is connected with vavuum pump 11, carried by 11 pairs of whole wet-process phosphoric acid concentration techniques of vavuum pump
For vacuum environment.
Further, in the step (1), the low pressure steam pressure of graphite heat exchanger 2 is that 0.29-0.31MPa, temperature are
135-140℃；Vacuum in the flash chamber 3 is 65-70KPa.Steam pressure is controlled by pressure-regulating valve.Steam
Pressure is too high, more than the graphite tubulation pressure voltage of graphite heat exchanger 2, graphite-pipe can be caused to damage；Steam pressure is too low, and band water is tight
Weight, can equally impact graphite tubulation, tubulation is damaged.Vapor (steam) temperature adds steam pipe by the subsidiary deaerated water regulation of boiler
The water in road is controlled.Vapor (steam) temperature is too high, can damage graphite tubulation；Temperature is too low, and band water is serious, can equally damage graphite
Tubulation.Evaporator vacuum lets out vacuum valve by adjusting into the circulating cooling water of barometric condenser 6 and the concentration import of vavuum pump 11
Aperture be controlled, vacuum degree control should not be too high, can meet sour temperature control system, too it is high can cause vacuum system equipment,
Pipeline, rubber lining come off, and damage equipment pipe.
Further, in the step (1), the mass concentration percentage composition for controlling the concentrated phosphoric acid after being concentrated by evaporation is
48%th, temperature is 80-85 DEG C.Mass concentration section after Phosphoric Acid Concentration is by adjusting the addition of diluted acid and entering graphite heat exchanger 2
Steam flow regulates and controls, and phosphoric acid concentration is too low, it is impossible to meet two ammonium production requirements, while fluorine recovery section can produce a large amount of silica gel,
Block shower nozzle and equipment pipe；Phosphoric acid concentration is too high, can reduce produce load, increases steam consumption, while accelerating graphite heat exchange
The scale velocity of device 2, shortens the cycle of operation.Temperature after Phosphoric Acid Concentration can by adjusting into the steam flow of graphite heat exchanger 2 and
The vacuum of flash chamber 3 is controlled, and sour Wen Taigao (more than 90 DEG C) can burn out rubber plantlining of equipment, the too low evaporated quantity of water of acid temperature
It is small, it is impossible to the need for meeting produce load.
Further, flash chamber 3 is cleaned with 5% sulfuric acid solution, cleaning temperature is 80-85 DEG C.Phosphoric acid,diluted is being concentrated to
Mass concentration is 48%P2O5During, precipitation can be separated out, causes graphite tubulation, the fouling of flash chamber 3 of graphite heat exchanger 2, this
The sediment of a little preferably foulings is mainly the calcium salt, sylvite and sodium salt of fluosilicic acid, it is necessary to periodically be cleaned to concentrator pipeline,
Cleaning fluid is 5% sulfuric acid solution, and cleaning temperature is 80-85 DEG C.Generally, cleaning in two weeks is about once, every time 8 hours
(can according to circumstances extend scavenging period).
Embodiment 1
The mass concentration that will be stored in phosphoric acid,diluted storage tank 1 for 24% phosphoric acid,diluted raw material by phosphoric acid,diluted storage tank 1 feed liquid
Outlet is discharged into flash chamber 3, and be passed through low-pressure steam in graphite heat exchanger 2 heats to recycle acid, its low pressure steam
Pressure is that 0.29MPa, temperature are 135 DEG C, then is discharged into flash chamber 3 and is mixed with phosphoric acid,diluted by the material liquid outlet of graphite heat exchanger 2
It is incorporated in be evaporated in flash chamber 3 and is condensed into concentrated phosphoric acid, it is true into the circulating cooling water of barometric condenser 6 and concentration by adjusting
The aperture that vacuum valve is let out in the empty import of pump 11 controls the vacuum in flash chamber 3 to be 70KPa, is steamed by adjusting into graphite heat exchanger 2
Temperature after steam flow amount and the vacuum degree control Phosphoric Acid Concentration of flash chamber 3 is 80 DEG C, by adjust phosphoric acid,diluted raw material addition and
Enter the steam flow of graphite heat exchanger 2, the mass concentration percentage composition of the concentrated phosphoric acid after evaporation and concentration is reached 48%；Concentrated phosphoric acid by
The material liquid outlet of flash chamber 3 enters in forced circulation pump 4, and part concentrated phosphoric acid is gone out by the concentrated phosphoric acid of the bottom loop of forced circulation pump 4
Mouth discharge, is delivered in concentrated phosphoric acid storage tank by concentrated phosphoric acid pump 7 and stored, and most of concentrated phosphoric acid passes through forced circulation as recycle acid
Pump 4 is delivered to formation circulation loop in graphite heat exchanger 2 and continues cycling through concentration, and the phosphoric acid concentration after concentration is 48% left
The right side, the phosphoric acid sludge containing 8-10% need to be clarified, and the concentrated phosphoric acid after clarification send two ammonium workshops, and sludge is store from concentrated phosphoric acid
Trench bottom is expelled to reactive tank circulating filtration；Condensate liquid is discharged into condensate liquid holding tank 12 in graphite heat exchanger 2, and passes through condensation
Liquid pump 10 is delivered in the deoxygenation water tank in desalted water workshop and recycled；Contain fluoride in the vapor evaporated in flash chamber 3
With phosphoric acid mist, vapor is discharged into the phosphoric acid mist separated in demister 5 in vapor by the steam (vapor) outlet of flash chamber 3,
Phosphoric acid mist is entered in forced circulation pump 4 by the acid solution outlet of demister 5 continues cycling through concentration, and fluoride gas are by demister 5
Gaseous phase outlet enter barometric condenser 6 in reclaimed by circulating water condensing, barometric condenser 6 is connected with vavuum pump 11, passes through
The whole wet-process phosphoric acid concentration technique of 11 pairs of vavuum pump provides vacuum environment.The finished product concentrated phosphoric acid yield of the present embodiment compares tradition
Wet-process phosphoric acid concentration technique volume increase 19% or so.
Embodiment 2
The mass concentration that will be stored in phosphoric acid,diluted storage tank 1 for 24% phosphoric acid,diluted raw material by phosphoric acid,diluted storage tank 1 feed liquid
Outlet is discharged into flash chamber 3, and be passed through low-pressure steam in graphite heat exchanger 2 heats to recycle acid, its low pressure steam
Pressure is that 0.30MPa, temperature are 135 DEG C, then is discharged into flash chamber 3 and is mixed with phosphoric acid,diluted by the material liquid outlet of graphite heat exchanger 2
It is incorporated in be evaporated in flash chamber 3 and is condensed into concentrated phosphoric acid, it is true into the circulating cooling water of barometric condenser 6 and concentration by adjusting
The aperture that vacuum valve is let out in the empty import of pump 11 controls the vacuum in flash chamber 3 to be 70KPa, is steamed by adjusting into graphite heat exchanger 2
Temperature after steam flow amount and the vacuum degree control Phosphoric Acid Concentration of flash chamber 3 is 83 DEG C, by adjust phosphoric acid,diluted raw material addition and
Enter the steam flow of graphite heat exchanger 2, the mass concentration percentage composition of the concentrated phosphoric acid after evaporation and concentration is reached 48%；Concentrated phosphoric acid by
The material liquid outlet of flash chamber 3 enters in forced circulation pump 4, and part concentrated phosphoric acid is gone out by the concentrated phosphoric acid of the bottom loop of forced circulation pump 4
Mouth discharge, is delivered in concentrated phosphoric acid storage tank by concentrated phosphoric acid pump 7 and stored, and most of concentrated phosphoric acid passes through forced circulation as recycle acid
Pump 4 is delivered to formation circulation loop in graphite heat exchanger 2 and continues cycling through concentration, and the phosphoric acid concentration after concentration is 48% left
The right side, the phosphoric acid sludge containing 8-10% need to be clarified, and the concentrated phosphoric acid after clarification send two ammonium workshops, and sludge is store from concentrated phosphoric acid
Trench bottom is expelled to reactive tank circulating filtration；Condensate liquid is discharged into condensate liquid holding tank 12 in graphite heat exchanger 2, and passes through condensation
Liquid pump 10 is delivered in the deoxygenation water tank in desalted water workshop and recycled；Contain fluoride in the vapor evaporated in flash chamber 3
With phosphoric acid mist, vapor is discharged into the phosphoric acid mist separated in demister 5 in vapor by the steam (vapor) outlet of flash chamber 3,
Phosphoric acid mist is entered in forced circulation pump 4 by the acid solution outlet of demister 5 continues cycling through concentration, and fluoride gas are by demister 5
Gaseous phase outlet enter barometric condenser 6 in reclaimed by circulating water condensing, barometric condenser 6 is connected with vavuum pump 11, passes through
The whole wet-process phosphoric acid concentration technique of 11 pairs of vavuum pump provides vacuum environment.The finished product concentrated phosphoric acid yield volume increase 20% of the present embodiment
Left and right.
Embodiment 3
The mass concentration that will be stored in phosphoric acid,diluted storage tank 1 for 24% phosphoric acid,diluted raw material by phosphoric acid,diluted storage tank 1 feed liquid
Outlet is discharged into flash chamber 3, and be passed through low-pressure steam in graphite heat exchanger 2 heats to recycle acid, its low pressure steam
Pressure is that 0.31MPa, temperature are 140 DEG C, then is discharged into flash chamber 3 and is mixed with phosphoric acid,diluted by the material liquid outlet of graphite heat exchanger 2
It is incorporated in be evaporated in flash chamber 3 and is condensed into concentrated phosphoric acid, it is true into the circulating cooling water of barometric condenser 6 and concentration by adjusting
The aperture that vacuum valve is let out in the empty import of pump 11 controls the vacuum in flash chamber 3 to be 65KPa, is steamed by adjusting into graphite heat exchanger 2
Temperature after steam flow amount and the vacuum degree control Phosphoric Acid Concentration of flash chamber 3 is 85 DEG C, by adjust phosphoric acid,diluted raw material addition and
Enter the steam flow of graphite heat exchanger 2, the mass concentration percentage composition of the concentrated phosphoric acid after evaporation and concentration is reached 48%；Concentrated phosphoric acid by
The material liquid outlet of flash chamber 3 enters in forced circulation pump 4, and part concentrated phosphoric acid is gone out by the concentrated phosphoric acid of the bottom loop of forced circulation pump 4
Mouth discharge, is delivered in concentrated phosphoric acid storage tank by concentrated phosphoric acid pump 7 and stored, and most of concentrated phosphoric acid passes through forced circulation as recycle acid
Pump 4 is delivered to formation circulation loop in graphite heat exchanger 2 and continues cycling through concentration, and the phosphoric acid concentration after concentration is 48% left
The right side, the phosphoric acid sludge containing 8-10% need to be clarified, and the concentrated phosphoric acid after clarification send two ammonium workshops, and sludge is store from concentrated phosphoric acid
Trench bottom is expelled to reactive tank circulating filtration；Condensate liquid is discharged into condensate liquid holding tank 12 in graphite heat exchanger 2, and passes through condensation
Liquid pump 10 is delivered in the deoxygenation water tank in desalted water workshop and recycled；Contain fluoride in the vapor evaporated in flash chamber 3
With phosphoric acid mist, vapor is discharged into the phosphoric acid mist separated in demister 5 in vapor by the steam (vapor) outlet of flash chamber 3,
Phosphoric acid mist is entered in forced circulation pump 4 by the acid solution outlet of demister 5 continues cycling through concentration, and fluoride gas are by demister 5
Gaseous phase outlet enter barometric condenser 6 in reclaimed by circulating water condensing, barometric condenser 6 is connected with vavuum pump 11, passes through
The whole wet-process phosphoric acid concentration technique of 11 pairs of vavuum pump provides vacuum environment.The concentrated phosphoric acid yield volume increase 19.5% of the present embodiment is left
It is right.
Described above is only presently preferred embodiments of the present invention, not makes any limit to the technical scope of the present invention
System, therefore any subtle modifications, equivalent variations and modifications that every technical spirit according to the present invention is made to above example,
Still fall within the range of technical scheme.
Claims (10)
1. a kind of Wet Phosphoric Acid Concentration Plant, it is characterised in that：Followed including phosphoric acid,diluted storage tank, graphite heat exchanger, flash chamber, pressure
Ring pump, demister, barometric condenser；
The material liquid outlet of the phosphoric acid,diluted storage tank and the material liquid outlet of graphite heat exchanger are connected with the feed liquid port of flash chamber respectively；
The graphite heat exchanger is provided with low-pressure steam inlet port；
The material liquid outlet of the flash chamber is connected with the entrance of forced circulation pump, the recycle acid outlet of the forced circulation pump and institute
The feed liquid port for stating graphite heat exchanger is connected, and the forced circulation pump loop bottom is exported provided with concentrated phosphoric acid；
The steam (vapor) outlet of the flash chamber is connected with the entrance of demister；
The acid solution outlet of the demister is connected with the entrance of forced circulation pump；The gaseous phase outlet and atmospheric condensation of the demister
The entrance of device is connected.
2. Wet Phosphoric Acid Concentration Plant as claimed in claim 1, it is characterised in that：The forced circulation pump loop bottom it is dense
Phosphoric acid outlet is connected by concentrated phosphoric acid pump with concentrated phosphoric acid storage tank；The material liquid outlet of the phosphoric acid,diluted storage tank is by phosphoric acid,diluted pump with dodging
The feed liquid port of steam room is connected.
3. Wet Phosphoric Acid Concentration Plant as claimed in claim 2, it is characterised in that：The forced circulation pump and graphite heat exchanger
Between be additionally provided with washing liquid pump.
4. Wet Phosphoric Acid Concentration Plant as claimed in claim 3, it is characterised in that：The bottom of the graphite heat exchanger is provided with cold
Condensate outlet, the condensate outlet is connected with condensate liquid holding tank.
5. Wet Phosphoric Acid Concentration Plant as claimed in claim 4, it is characterised in that：The condensate outlet of the barometric condenser
It is connected with vavuum pump.
6. Wet Phosphoric Acid Concentration Plant as claimed in claim 5, it is characterised in that：The graphite heat exchanger and flash chamber it
Between, pass through 2205 duplex phase stainless tubes between flash chamber and forced circulation pump, forced circulation pump and graphite heat exchanger and connect.
7. a kind of wet-process phosphoric acid concentration technique, it is characterised in that：Using Wet Phosphoric Acid Concentration Plant as claimed in claim 6,
Comprise the following steps：
Step (1)：The phosphoric acid,diluted raw material being stored in phosphoric acid,diluted storage tank is discharged into flash chamber by the material liquid outlet of phosphoric acid,diluted storage tank
In, low-pressure steam is passed through in graphite heat exchanger recycle acid is heated, then be discharged into by the material liquid outlet of graphite heat exchanger to sudden strain of a muscle
Mix to be incorporated in be evaporated in flash chamber with phosphoric acid,diluted in steam room and be condensed into concentrated phosphoric acid；
Step (2)：The concentrated phosphoric acid is entered in forced circulation pump by the material liquid outlet of flash chamber, and part concentrated phosphoric acid is by forced circulation
The concentrated phosphoric acid outlet discharge of pump bottom loop, is delivered in concentrated phosphoric acid storage tank by concentrated phosphoric acid pump and stored；Most of concentrated phosphoric acid is made
Formation circulation loop in graphite heat exchanger is delivered to by forced circulation pump for recycle acid and continues cycling through concentration；In graphite heat exchanger
Condensate liquid is discharged into condensate liquid holding tank；
Step (3)：In the vapor evaporated in the flash chamber contain fluoride and phosphoric acid mist, vapor by flash chamber steaming
Vapor outlet is discharged into the phosphoric acid mist separated in demister in vapor, and phosphoric acid mist enters strong by the acid solution outlet of demister
Concentration is continued cycling through in circulating pump processed, gas is entered to condense in barometric condenser by the gaseous phase outlet of demister to be reclaimed, described big
Gas condenser 6 is connected with vavuum pump 11, and vacuum environment is provided by 11 pairs of whole wet-process phosphoric acid concentration techniques of vavuum pump.
8. wet-process phosphoric acid concentration technique as claimed in claim 7, it is characterised in that：In the step (1), in graphite heat exchanger
Low-pressure steam pressure is that 0.29-0.31MPa, temperature are 135-140 DEG C；Vacuum in the flash chamber is 65-70KPa.
9. wet-process phosphoric acid concentration technique as claimed in claim 8, it is characterised in that：In the step (1), control is concentrated by evaporation
The mass concentration percentage composition of concentrated phosphoric acid afterwards is that 48%, temperature is 80-85 DEG C.
10. wet-process phosphoric acid concentration technique as claimed in claim 8, it is characterised in that：Flash chamber is cleaned with 5% sulfuric acid solution,
Cleaning temperature is 75-80 DEG C.
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| CN201710264353.6A CN107188143A (en) | 2017-04-21 | 2017-04-21 | A kind of Wet Phosphoric Acid Concentration Plant and its technique |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109264687A (en) * | 2018-10-18 | 2019-01-25 | 昆明理工大学 | A kind of phosphoric acid microwave flash distillation prepares the method and apparatus of polyphosphoric acid |
| CN110510591A (en) * | 2019-09-27 | 2019-11-29 | 瓮福达州化工有限责任公司 | A kind of high purity phosphorus hydrochlorate concentration technology |
| CN110562943A (en) * | 2019-09-05 | 2019-12-13 | 云南云天化以化磷业研究技术有限公司 | Method for continuously preparing superphosphoric acid |
| CN115626615A (en) * | 2022-10-24 | 2023-01-20 | 中石化南京工程有限公司 | System and method for three-stage concentration of phosphoric acid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108046222A (en) * | 2017-11-30 | 2018-05-18 | 湖北东方化工有限公司 | High-concentration sulfuric acid forced circulated heating system and its application method with quick brush-wash function |
| CN109264687A (en) * | 2018-10-18 | 2019-01-25 | 昆明理工大学 | A kind of phosphoric acid microwave flash distillation prepares the method and apparatus of polyphosphoric acid |
| CN110562943A (en) * | 2019-09-05 | 2019-12-13 | 云南云天化以化磷业研究技术有限公司 | Method for continuously preparing superphosphoric acid |
| CN110510591A (en) * | 2019-09-27 | 2019-11-29 | 瓮福达州化工有限责任公司 | A kind of high purity phosphorus hydrochlorate concentration technology |
| CN115626615A (en) * | 2022-10-24 | 2023-01-20 | 中石化南京工程有限公司 | System and method for three-stage concentration of phosphoric acid |
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