CN107935264A - A kind of sea water desalination salt manufacturing comprehensive technological method - Google Patents
A kind of sea water desalination salt manufacturing comprehensive technological method Download PDFInfo
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- CN107935264A CN107935264A CN201711246650.4A CN201711246650A CN107935264A CN 107935264 A CN107935264 A CN 107935264A CN 201711246650 A CN201711246650 A CN 201711246650A CN 107935264 A CN107935264 A CN 107935264A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/22—Treatment of water, waste water, or sewage by freezing
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The step of present invention provides a kind of sea water desalination salt manufacturing comprehensive technological method, belongs to seawater treatment technologies field, the process be：Seawater enters reverse-osmosis treated after pretreatment, reverse osmosis concentrated water enters nanofiltration device, nanofiltration concentrated water salt manufacturing after carrying bromine, adjust pH plus reducing agent, and concentrated water of the nanofiltration production water by the processing of high pressure reverse osmosis unit enters electrodialysis plant, strong brine is obtained, strong brine is through function of mechanical steam recompression device salt manufacturing.Using nanofiltration, a series of technologies such as high pressure is reverse osmosis, electrodialysis, mechanical steam recompression technology, by dosing, concentration and grading recycle, the comprehensive utilization of seawater is realized in composition sealing and circulating circuit, and then salt manufacturing, carry bromine, carry magnesium, saltcake processed etc..
Description
Technical field
The present invention relates to seawater treatment technologies field, specifically a kind of sea water desalination salt manufacturing comprehensive technological method.
Background technology
China's water resource critical shortage, fresh water amount is few per capita and spatial and temporal distributions are uneven.Sea water desalination can be unrestricted
System, stable offer freshwater resources, are greatly reduced, China's sea water desalination is obtained recently as the progress water producing cost of technology
It is fast-developing.
With the expansion of sea water desalination industry size, the discharge of by-product concentrated seawater is asking for desalination technology urgent need to resolve
Topic.Currently used method for treating strong brine can be divided into two major classes：The first kind is directly to discharge, and is such as discharged into ocean, surface water, dirt
Water treatment system etc.；Second class is recycled strong brine, such as surface irrigation, salt manufacturing, extraction industrial chemicals.Concentrated seawater is straight
Run in and put and marine organisms and marine environment can be had some impact on, polluted surface water and underground water, increase sewage treatment plant
Processing load.In terms of recycling, the method primarily now tedded using salt pan, but with coastal area expanding economy, salt
Field brewed brine area is gradually reduced, and limits its application range.
For Salt Industry, due to the development of infant industry, there is an urgent need to land resource, the salt pan of low yield extracting rate into
Decline increasingly for primary reduction target, another aspect subsurface brine resource exhaustion, concentration and storage, rely on subsurface brine resource shape
Into the gradual atrophy of Salt production ability, Salt production and cost of labor, which are significantly increased, in addition also promotes salt industry Transformation Development.
Brine resources are substituted using the by-product concentrated seawater of sea water desalination, develop a kind of novel sea water desalinization concentrated seawater batch production
Brewed brine Comprehensive Utilization Scheme, can both save floor occupying area, raise labour productivity, and new outlet is found for sea salt development, and can
It is the inevitable choice of Development of Salt Industry to realize the zero-emission of desalination technology by-product concentrated seawater, and solves sea water desalination system
About factor there is an urgent need to.
The content of the invention
The technical assignment of the present invention is to solve the deficiencies in the prior art, there is provided a kind of sea water desalination salt manufacturing composite technology side
Method.
The technical scheme is that realize in the following manner, its core process is reverse osmosis, electric using nanofiltration, high pressure
A series of technologies such as dialysis, mechanical steam recompression technology, by dosing, concentration and grading recycle, form sealing and circulating
Circuit, and then salt manufacturing, carry bromine, carry magnesium, saltcake processed etc., realize the comprehensive utilization of seawater.
The step of process is：
Seawater enters reverse-osmosis treated after pretreatment, and reverse osmosis concentrated water enters nanofiltration after carrying bromine, adjust pH plus reducing agent and fills
To put, nanofiltration concentrated water salt manufacturing, concentrated water of the nanofiltration production water by the processing of high pressure reverse osmosis unit enters electrodialysis plant, obtains strong brine,
Strong brine is through function of mechanical steam recompression device salt manufacturing.
The step of scheme as an optimization of the process is：
Seawater handles to obtain reverse osmosis produced water and reverse osmosis concentrated water, reverse osmosis concentrated water acid by preprocessing process into counter-infiltration system
Change, and bromine is carried into bromine device is carried, put forward bromine concentrated water and added by pH adjustings after reducing agent, separated into the first nanofiltration device
One divalent ion, obtains the first nanofiltration production water and the first nanofiltration concentrated water；
First nanofiltration is produced water and is concentrated into downstream subsequent technique, and the first nanofiltration concentrated water enters downstream byproduct technique；
First nanofiltration production water is concentrated into high pressure reverse osmosis unit, and high pressure reverse osmosis produced water takes out collection or grading recycle returns
Stream enters the counter-infiltration system circular treatment of upstream, and high pressure reverse osmosis concentrated water is concentrated into electrodialysis plant, obtains electrodialysis concentration
Water and electrodialysis desalination water, electrodialysis condensed water enter mechanical steam recompression device salt manufacturing, and electrodialysis desalination water flows back into
Enter the high pressure reverse osmosis unit circular treatment of upstream；
First nanofiltration concentrated water enters deliming technique and carries out deliming, and solution, which enters, after deliming puies forward magnesium process, puies forward magnesium Mother liquor and enters system
Saltcake process, saltcake mother liquor processed enter the second nanofiltration device nanofiltration after adjusting, the second nanofiltration concentrate recirculation is filled into the first nanofiltration
Circular treatment is put, the second nanofiltration production water flows back into high pressure reverse osmosis unit and concentrated.
Sea water preprocessing process is using one or more combinations in media filtration, micro-filtration, ultrafiltration, for removing sea
Water mechanical admixture, the seawater of pretreatment reach pollution index SDI less than 5, and turbidity is less than 1 NTU.
First nanofiltration device and the second nanofiltration device are used for high level salt solution, the nanofiltration membrane component of high separating efficiency, the
One nanofiltration device and the second nanofiltration device use one-part form nanofiltration technique or two-part nanofiltration technique, and using under nanofiltration membrane component
The recycling of the acquisition nanofiltration membrane component pressure energy of trip reflux upstream, operation pressure control is in 2.0~3.8Mpa, rate of recovery control
50%~70%, more than 99% is reached to the rejection of sulfate radical, more than 80% is reached to calcium ion rejection, to magnesium ion
Rejection reaches more than 95%, is less than 20% to the rejection of chlorion.
High pressure reverse osmosis unit is fine and close using Upstream section high pressure reverse osmosis membrane, is gradient to tract high pressure reverse osmosis membrane and dredges
Pine, the multistage concentration high pressure reverse osmosis process of film compactness extent gradual change.
The control pressure of high pressure reverse osmosis unit processing is in 8.0~12.0 MPa, 15~45 DEG C of temperature；
Handle the reverse osmosis concentrated water concentration of high pressure is 9~12 ° of B é, the g/L of the wherein concentration 60g/L of chlorion~100, sulfate radical
0.1g/L~1g/L, calcium ion 0.1g/L~1g/L, magnesium ion 0.1g/L~1g/L；
The reverse osmosis low concentration production water concentration of high pressure is less than 10g/L in 1 ° of below B é, the wherein concentration of chlorion, and sulfate radical is less than
0.01g/L, calcium ion are less than 0.01g/L, and magnesium ion is less than 0.01g/L；
The reverse osmosis high concentration of high pressure produces concentration 20 g/Ls ± 5g/L of the water in 2 ° of B é ± 1 ° B é, wherein chlorion, and sulfate radical is less than
0.01 g/L, calcium ion are less than 0.01 g/L, and magnesium ion is less than 0.01 g/L.
Sodium chloride concentration in brine can be improved 5~7 times by electrodialysis plant, and concentration brings up to 240~270g/L, calcium from
Sub- 0.4~0.6g/L of controlled concentration, 0.1~0.3g/L of magnesium ion controlled concentration.
Deliming technique uses flue gas deliming method, and 7.8~8.6, carbon dioxide volume fraction is controlled 8% for pH value control
~15%, liquid-gas ratio control adds calcium carbonate crystal seed 18~24, and 3%~9%, calcium ion removal rate reaches for mass fraction control
50%~90%.
Magnesium process is put forward using technique of the hydrogenation sodium oxide molybdena as precipitating reagent, reaction temperature is controlled at 20~60 DEG C, OH-/
Mg2The control of+ion concentration is 0.8~1.6, magnesium extraction rate reached to 60%~99%.
Saltcake process processed uses frozen saltpeter mention, adjusts the temperature to -1 DEG C~-15 DEG C, extraction rate reached to 60%~90%, carries nitre
The control of mother liquor nanofiltration process pressure is controlled 50%~90% in 2.0~3.8Mpa, the rate of recovery.
The caused compared with prior art beneficial effect of the present invention is：
A kind of sea water desalination salt manufacturing comprehensive technological method of the present invention is that a kind of utilize arranges dense salt outside Reverse-osmosis Seawater Desalination Technology
Water salt manufacturing and the method for comprehensive utilization.
Compared with prior art, the present invention one is the comprehensive utilization for realizing seawater, desalination technology is realized with carrying
Bromine, salt manufacturing, carry being combined with each other for the technologies such as magnesium, saltcake processed, has accomplished the zero-emission of concentrated seawater；Second, the batch production system of realizing
Halogen, reduces salt manufacturing and teds area；Third, intake using sea water desalination concentrated seawater as bromine is carried；Fourth, the classification for realizing production water is returned
With improving each production water application efficiency, reduce processing cost；Fifth, by nanofiltration, high pressure is reverse osmosis, electrodialysis and mechanical steams
Vapour recompression couples, and for Salt production, has saved land resource, has improved production efficiency.
Brief description of the drawings
Attached drawing 1 is the method technological process principle schematic of the present invention.
Mark in attached drawing represents respectively：
1st, reverse osmosis unit；2nd, bromine device is carried；3rd, the first nanofiltration device；4th, high pressure reverse osmosis unit；5th, electrodialysis plant；6th, machine
Tool formula steam recompression device；7th, calcium-removing device；8th, magnesium apparatus is carried；9th, denitrification apparatus；10th, the second nanofiltration device.
Embodiment
A kind of sea water desalination salt manufacturing comprehensive technological method of the present invention is described in detail below below in conjunction with the accompanying drawings.
As shown in drawings, the step of process of the invention is：
（1）For pre-treating seawater by counter-infiltration system production fresh water, concentrated seawater acidifying, bromine is carried into bromine device is carried.
（2）Concentrated seawater adds reducing agent by pH adjustings after carrying bromine, separates a divalence into the first nanofiltration device afterwards
Ion, the first nanofiltration are produced water and are concentrated into subsequent technique, and the first nanofiltration concentrated water enters other techniques.
（3）Scale-forming ion has been removed in first nanofiltration production water, can carry out the concentration of high power, the first nanofiltration produce water into
Enter that high pressure is reverse osmosis to be concentrated.The reverse osmosis different section production water of high pressure are collected respectively and carry out grading recycle, and rear end production water returns anti-
Infiltration water inlet, front end production water can enter low pressure reverse osmosis device pure water.
（4）High pressure reverse osmosis concentrated water is concentrated into electrodialysis plant, and electrodialysis condensed water enters mechanical steam recompression
Device salt manufacturing, desalted water return to high pressure feed water by reverse osmosis.
（5）The first nanofiltration of concentrated seawater concentrated water removes wherein calcium ion in order to further concentrating.
（6）Solution, which enters, after deliming puies forward magnesium process.
（7）Put forward magnesium Mother liquor and enter saltcake process processed.
（8）Saltcake mother liquor processed enters the second nanofiltration device after adjusting, the second nanofiltration concentrated water the first nanofiltration device of return, and second
Nanofiltration production water returns to the reverse osmosis process of high pressure.
Sewater pretreating method is using the one or more combination mode in media filtration, micro-filtration, ultrafiltration, for removing
Mechanical admixture.For different influent qualities, selected preprocess method would also vary from, but finally should ensure that pretreatment
The production water SDI of unit is less than 5, and turbidity is less than 1 NTU.
Nanofiltration device, it is characterised in that adopted using a kind of for high level salt solution, the nanofiltration membrane component of high separating efficiency, device
With one-part form nanofiltration technique or two-part nanofiltration technique, and using the acquisition nanofiltration membrane component of nanofiltration membrane component downstream reflux upstream
The recycling of pressure energy.In 2.0~3.8Mpa, rate of recovery control reaches the rejection of sulfate radical 50%~70% for pressure control
To more than 99%, more than 80% is reached to calcium ion rejection, more than 95% is reached to magnesium ion rejection, to chlorion
Rejection is less than 20%.
High pressure reverse osmosis unit, using multistage concentration technology, is designed to that 2~5 sections are concentrated, film between every section by device
Compactness extent it is different, it is fine and close using Upstream section high pressure reverse osmosis membrane, be gradient to that tract high pressure reverse osmosis membrane is loose, and film is fine and close
The multistage concentration high pressure reverse osmosis process of degree gradual change.
High pressure reverse osmosis unit control pressure is in 8.0~12.0 MPa, 15~45 DEG C of temperature.The high pressure is anti-
Infiltration concentrated water concentration is 9~12 ° of B é, the wherein concentration 60g/L of chlorion~100 g/L, 0.1 g/L of sulfate radical~1g/
L, 0.1 g/L of calcium ion~1g/L, the g/L of 0.1 g/L of magnesium ion~1.Described low concentration production water in 1 ° of below B é, its
The concentration of middle chlorion is less than 10 g/L, and sulfate radical is less than 0.01 g/L, and calcium ion is less than 0.01 g/L, and magnesium ion is less than 0.01
g/L.The high concentration production water is less than 0.01 in 2 ° of B é ± 1 ° B é or so, wherein 20 g/L of concentration of chlorion or so, sulfate radical
G/L, calcium ion are less than 0.01 g/L, and magnesium ion is less than 0.01 g/L.
Sodium chloride concentration in brine can be improved 5~7 times by electrodialysis plant, and concentration brings up to 240~270g/L, its
His ion such as 0.4~0.6g/L of calcium ion controlled concentration, 0.1~0.3g/L of magnesium ion controlled concentration.
Nanofiltration concentrated water deliming process uses flue gas deliming method, and pH value control is 7.8~8.6, carbon dioxide volume fraction
8%~15%, liquid-gas ratio control adds calcium carbonate crystal seed 18~24 for control, and 3%~9%, calcium ion is gone for mass fraction control
Except rate reaches 50%~90%.
Magnesium process is put forward using technique of the hydrogenation sodium oxide molybdena as precipitating reagent, reaction temperature is controlled at 20~60 DEG C, n（OH-）/
n（Mg2+）Control is 0.8~1.6, magnesium extraction rate reached to 60%~99%.
Saltcake process processed uses frozen saltpeter mention, adjusts the temperature to -1 DEG C~-15 DEG C, extraction rate reached to 60%~90%.
The control of nitre mother liquor nanofiltration process pressure is proposed to control 50%~90% in 2.0~3.8Mpa, the rate of recovery.
Embodiment 1：
Certain reverse osmosis unit seawater desalting plant, 25000 ton day of inflow, influent concentration are 3.2 ° of B é, sodium ion 11g/L, calcium from
Sub- 0.4g/L, magnesium ion 1.2g/L, sulfate ion 2.3g/L, chlorion 18g/L, bromide ion 0.065g/L, by pretreatment
Into reverse osmosis unit（1）, the rate of recovery 40%, water yield is 10000 ton days, and production water power leads 300 μ s cm-1It is anti-into two level
Infiltration production pure water；Concentrated water amount is 15000 ton days, and concentrated water concentration is 4~5 ° of B é, wherein sodium ion 18.3g/L, calcium ion 0.6~
0.7g/L, 1.8~2.2g/L of magnesium ion, 3.5~4.5g/L of sulfate ion, 29~31g/L of chlorion, bromide ion 0.1g/L.
Concentrated seawater carries bromine into bromine device is carried, and concentrated seawater bromine concentration is 0.1g/L, and pH value is controlled 2.5~4, is with chlorine rate
105%~130%, chlorine gas outlet pressure is controlled in 0.45Mpa~0.5Mpa.
Sea water desalination concentrated seawater enters the first nanofiltration device 3 after overregulating pH value, add reducing agent, and the rate of recovery 55%~
60%, nanofiltration production water concentration 3~4 ° of B é, 16~17g/L of sodium ion, calcium ion 0.05g/L, magnesium ion 0.02g/L, sulfate radical from
Sub- 0.02g/L, 26~27g/L of chlorion；Nanofiltration concentrated water concentration 5~6 ° of B é, wherein 18~19g/L of sodium ion, calcium ion 1.5~
2g/L, 4.5~5.5g/L of magnesium ion, 9~10g/L of sulfate ion, 32~34g/L of chlorion.
Water enriching stage is produced in first nanofiltration：
First nanofiltration device production water concentrated into high pressure reverse osmosis unit 4, by concentration production 9~12 ° of B é of water concentration, sodium from
Son 60~65g/L, calcium ion ＜ 0.15g/L, magnesium ion ＜ 0.06g/L, sulfate ion ＜ 0.06g/L, chlorion 75~
90g/L；The preferable electrical conductivity of water is produced in 2000~3000 μ scm in the reverse osmosis front end of high pressure-1, two can be mixed with reverse osmosis produced water
The reverse osmosis produced high purity water of level, the reverse osmosis poor electrical conductivity of rear end producing water water quality of high pressure make 30~40 mscm-1, can conduct（Sea
Water is desalinated）Reverse osmosis unit 1 is intake.
Into electrodialysis plant 5, electrodialysis desalination water concentration 3~4 ° of B é, 20~30g/L of sodium ion, calcium ion 0.1~
0.2g/L, 0.05~0.1g/L of magnesium ion, 0.05~0.1g/L of sulfate ion, 30~40g/L of chlorion；Electrodialysis condensed water
Concentration 20 ° of B é, 90~100g/L of sodium ion, 0.4~0.6g/L of calcium ion, 0.1~0.3g/L of magnesium ion, sulfate ion 0.2
~0.3g/L, 130~170g/L of chlorion.
Electrodialysis condensed water enters 6 salt manufacturing of mechanical steam recompression device.
First nanofiltration concentrated water processing stage：
Nanofiltration concentrated water deliming process described in first nanofiltration device uses flue gas deliming method, and magnesium is carried except mother liquor of calcium adjusting pH value enters
Process, 4.5~5.5 ° of B é of concentration, wherein 26~27g/L of sodium ion, 0.3~0.4g/L of calcium ion, magnesium ion 0.45 after processing
~0.55g/L, 9~10g/L of sulfate ion, 32~34g/L of chlorion；
Carry the mother liquor after magnesium and enter saltcake process processed, adjust the temperature to -1 DEG C~-15 DEG C, 4~5 ° of B é of concentration, wherein sodium after denitration
21~22g/L of ion, 0.3~0.4g/L of calcium ion, 0.3~0.5g/L of magnesium ion, 2~3g/L of sulfate ion, chlorion 32
~34g/L.
Saltcake Mother liquor processed enters the second nanofiltration device 10, the second nanofiltration production water concentration 4~5 ° of B é, wherein 20~21g/ of sodium ion
L, 0.05~0.1g/L of calcium ion, 0.02~0.03g/L of magnesium ion, 0.01~0.02g/L of sulfate ion, chlorion 30~
32g/L, nanofiltration production water return to high pressure reverse osmosis unit 4；Second 4.5~5.5 ° of B é of nanofiltration concentrated water concentration, wherein sodium ion 23~
24g/L, 0.5~0.6g/L of calcium ion, 0.9~1.1g/L of magnesium ion, 4~6g/L of sulfate ion, 34~36g/L of chlorion,
Return to 3 reuse of the first nanofiltration device.
Claims (10)
1. a kind of sea water desalination salt manufacturing comprehensive technological method, it is characterised in that the step of process is：
Seawater enters reverse-osmosis treated after pretreatment, and reverse osmosis concentrated water enters nanofiltration after carrying bromine, adjust pH plus reducing agent and fills
To put, nanofiltration concentrated water salt manufacturing, concentrated water of the nanofiltration production water by the processing of high pressure reverse osmosis unit enters electrodialysis plant, obtains strong brine,
Strong brine is through function of mechanical steam recompression device salt manufacturing.
2. a kind of sea water desalination salt manufacturing comprehensive technological method, it is characterised in that the step of process is：
Seawater handles to obtain reverse osmosis produced water and reverse osmosis concentrated water, reverse osmosis concentrated water acid by preprocessing process into counter-infiltration system
Change, and bromine is carried into bromine device is carried, put forward bromine concentrated water and added by pH adjustings after reducing agent, separated into the first nanofiltration device
One divalent ion, obtains the first nanofiltration production water and the first nanofiltration concentrated water；
First nanofiltration is produced water and is concentrated into downstream subsequent technique, and the first nanofiltration concentrated water enters downstream byproduct technique；
First nanofiltration production water is concentrated into high pressure reverse osmosis unit, and high pressure reverse osmosis produced water takes out collection or grading recycle returns
Stream enters the counter-infiltration system circular treatment of upstream, and high pressure reverse osmosis concentrated water is concentrated into electrodialysis plant, obtains electrodialysis concentration
Water and electrodialysis desalination water, electrodialysis condensed water enter mechanical steam recompression device salt manufacturing, and electrodialysis desalination water flows back into
Enter the high pressure reverse osmosis unit circular treatment of upstream；
First nanofiltration concentrated water enters deliming technique and carries out deliming, and solution, which enters, after deliming puies forward magnesium process, puies forward magnesium Mother liquor and enters system
Saltcake process, saltcake mother liquor processed enter the second nanofiltration device nanofiltration after adjusting, the second nanofiltration concentrate recirculation is filled into the first nanofiltration
Circular treatment is put, the second nanofiltration production water flows back into high pressure reverse osmosis unit and concentrated.
A kind of 3. sea water desalination salt manufacturing comprehensive technological method according to claim 2, it is characterised in that：
Sea water preprocessing process is using one or more combinations in media filtration, micro-filtration, ultrafiltration, for removing seawater machine
Tool impurity, the seawater of pretreatment reach pollution index SDI less than 5, and turbidity is less than 1 NTU.
A kind of 4. sea water desalination salt manufacturing comprehensive technological method according to claim 2, it is characterised in that：
First nanofiltration device and the second nanofiltration device are used for high level salt solution, the nanofiltration membrane component of high separating efficiency, and first receives
Filter device and the second nanofiltration device use one-part form nanofiltration technique or two-part nanofiltration technique, and nanofiltration concentrated water energy is returned
Receive, operation pressure control in 2.0~3.8Mpa, rate of recovery control 50%~70%, the rejection of sulfate radical is reached 99% with
On, more than 80% is reached to calcium ion rejection, more than 95% is reached to magnesium ion rejection, the rejection of chlorion is less than
20%。
A kind of 5. sea water desalination salt manufacturing comprehensive technological method according to claim 2, it is characterised in that：
High pressure reverse osmosis unit is fine and close using Upstream section high pressure reverse osmosis membrane, and it is loose to be gradient to tract high pressure reverse osmosis membrane, film
The multistage concentration high pressure reverse osmosis process of compactness extent gradual change.
A kind of 6. sea water desalination salt manufacturing comprehensive technological method according to claim 2, it is characterised in that：The reverse osmosis dress of high pressure
The control pressure of processing is put in 8.0~12.0 MPa, 15~45 DEG C of temperature；
Handle the reverse osmosis concentrated water concentration of high pressure is 9~12 ° of B é, the g/L of the wherein concentration 60g/L of chlorion~100, sulfate radical
0.1g/L~1g/L, calcium ion 0.1g/L~1g/L, magnesium ion 0.1g/L~1g/L；
The reverse osmosis low concentration production water concentration of high pressure is less than 10g/L in 1 ° of below B é, the wherein concentration of chlorion, and sulfate radical is less than
0.01g/L, calcium ion are less than 0.01g/L, and magnesium ion is less than 0.01g/L；
The reverse osmosis high concentration of high pressure produces concentration 20 g/Ls ± 5g/L of the water in 2 ° of B é ± 1 ° B é, wherein chlorion, and sulfate radical is less than
0.01 g/L, calcium ion are less than 0.01 g/L, and magnesium ion is less than 0.01 g/L.
A kind of 7. sea water desalination salt manufacturing comprehensive technological method according to claim 2, it is characterised in that：
Sodium chloride concentration in brine can be improved 5~7 times by electrodialysis plant, and concentration to 240~270g/L, calcium ion controls dense
Spend 0.4~0.6g/L, 0.1~0.3g/L of magnesium ion controlled concentration.
A kind of 8. sea water desalination salt manufacturing comprehensive technological method according to claim 2, it is characterised in that：
Deliming technique uses flue gas deliming method, pH value control 7.8~8.6, the control of carbon dioxide volume fraction 8%~
15%, liquid-gas ratio control adds calcium carbonate crystal seed 18~24, and 3%~9%, calcium ion removal rate reaches for mass fraction control
50%~90%.
A kind of 9. sea water desalination salt manufacturing comprehensive technological method according to claim 2, it is characterised in that：
Magnesium process is put forward using technique of the hydrogenation sodium oxide molybdena as precipitating reagent, reaction temperature is controlled at 20~60 DEG C, OH-/Mg2+ from
The control of sub- concentration ratio is 0.8~1.6, magnesium extraction rate reached to 60%~99%.
A kind of 10. sea water desalination salt manufacturing comprehensive technological method according to claim 2, it is characterised in that：
Saltcake process processed uses frozen saltpeter mention, adjusts the temperature to -1 DEG C~-15 DEG C, extraction rate reached to 60%~90%, carries nitre mother liquor
The control of nanofiltration process pressure is controlled 50%~90% in 2.0~3.8Mpa, the rate of recovery.
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| CN113087229A (en) * | 2021-04-28 | 2021-07-09 | 中国华能集团清洁能源技术研究院有限公司 | Carbon sequestration application system and method for concentrated seawater |
| CN113401929A (en) * | 2021-06-23 | 2021-09-17 | 湖北富邦科技股份有限公司 | Method for preparing nano calcium carbonate magnesium material by using nanofiltration seawater to trap carbon dioxide |
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| CN115321485A (en) * | 2022-10-17 | 2022-11-11 | 唐山三友化工股份有限公司 | Method for extracting chemical elements from concentrated seawater |
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