CN109020021A - It is a kind of sea desalination and strong brine comprehensively utilize energy saving technique - Google Patents

It is a kind of sea desalination and strong brine comprehensively utilize energy saving technique Download PDF

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CN109020021A
CN109020021A CN201810795629.8A CN201810795629A CN109020021A CN 109020021 A CN109020021 A CN 109020021A CN 201810795629 A CN201810795629 A CN 201810795629A CN 109020021 A CN109020021 A CN 109020021A
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strong brine
mgcl
mgso
nacl
kcl
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彭赛军
朱晓峰
柴朝晖
袁建军
唐娜
张维胜
冯逸仙
项振荣
周堃
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China Zhongqing International Engineering Co Ltd
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China Zhongqing International Engineering Co Ltd
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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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D3/00—Halides of sodium, potassium or alkali metals in general
    • C01D3/04—Chlorides
    • C01D3/06—Preparation by working up brines; seawater or spent lyes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F5/00—Compounds of magnesium
    • C01F5/26—Magnesium halides
    • C01F5/30—Chlorides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F5/00—Compounds of magnesium
    • C01F5/40—Magnesium sulfates
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • 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
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • 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
    • 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
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/02—Temperature
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/046—Recirculation with an external loop
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Abstract

A kind of sea desalination and strong brine comprehensively utilize energy saving technique, take sodium chloride-containing, magnesium sulfate, potassium chloride, sodium bromide, magnesium chloride extra large salt water be raw material, carry out extra large desalination, obtain fresh water and strong brine；By the strong brine using air blowout method production bromine and debrominate strong brine；The debrominate strong brine nanofiltration separation is obtained into monovalence compound strong brine and bivalent compound strong brine, monovalence strong brine high temperature evaporation is obtained into sodium chloride and salt-making mother liquor, the salt-making mother liquor low-temperature evaporation is obtained into potassium chloride and potassium mother liquor processed, the potassium Recycling Mother Solution processed is extremely mixed with debrominate strong brine and carries out nanofiltration, divalent strong brine high temperature evaporation is obtained into magnesium sulfate monohydrate and mother liquid of magnesium processed, which is concentrated by evaporation cooling and obtains magnesium chloride product.The present invention has process flow reasonable, and heat utilization rate is high, and product quality is high, and production cost and energy consumption are greatly lowered, realize the characteristics of strong brine zero-emission, is adapted to extensive extra large desalination.

Description

It is a kind of sea desalination and strong brine comprehensively utilize energy saving technique
Technical field
The invention belongs to technical field of inorganic chemical industry, especially a kind of extra large desalination and strong brine comprehensively utilize energy saving work Skill.
Background technique
Extra large desalination and strong brine comprehensive utilization, i.e., extract fresh water, chemical element, chemicals and deep processing from seawater Deng.It is known using the seawater of the components such as saliferous, magnesium sulfate, extra large desalination potassium chloride, bromine, magnesium chloride as raw material for producing fresh water And strong brine, adding halogen method produce salt, magnesium sulfate, potassium chloride, bromine and magnesium chloride technique, are a kind of synthesis of sewater chemistry resource Using technique, however that there are process flows is long for the technique, and heat energy utilization is unreasonable, and steam consumption is very high, and the production cost is very high, no The problem of adapting to extensive extra large desalination.Therefore, the above method produces salt, magnesium sulfate, potassium chloride, bromine and magnesium chloride Process economy and adaptability are all poor.
Summary of the invention
The object of the present invention is to provide a kind of extra large desalinations and strong brine to comprehensively utilize energy saving technique, utilizes membrane technology Fresh water, monovalence and bivalent compound are separated, separation monovalence and bivalent compound is evaporated by reasonable process routes, is conducive to drop Low investment, energy consumption and cost, the problem of can solve less economical prior art and adaptability.
To achieve the above object, the present invention takes following technical scheme:
It is a kind of sea desalination and strong brine comprehensively utilize energy saving technique, which is characterized in that it includes the following steps:
A. take sodium chloride-containing, magnesium sulfate, potassium chloride, sodium bromide, magnesium chloride extra large salt water be raw material, using thermal distillation method or Hyperfiltration or electroosmose process carry out extra large desalination, and desalination temperature is 20-130 DEG C, obtain fresh water and strong brine；
B. by the strong brine using air blowout method production bromine and debrominate strong brine；
C. the debrominate strong brine nanofiltration separation is obtained into monovalence compound strong brine (containing a small amount of bivalent compound) and two Valence compound strong brine (contains a small amount of monovalence compound), and nanofiltration temperature is 20--30 DEG C；
D. monovalence compound strong brine high temperature evaporation is obtained into sodium chloride and salt-making mother liquor, evaporating temperature is 100-140 DEG C；
E. the salt-making mother liquor low-temperature evaporation is obtained into potassium chloride and potassium mother liquor processed (containing part bivalent compound), evaporation temperature Degree is 20-70 DEG C；
F. by the potassium Recycling Mother Solution processed to step C, nanofiltration, mixing temperature 20-30 are mixed and carried out with debrominate strong brine ℃；
G. bivalent compound strong brine high temperature evaporation is obtained into magnesium sulfate monohydrate and mother liquid of magnesium processed, evaporating temperature 70-140 ℃；
H. the mother liquid of magnesium processed is concentrated by evaporation cooling and obtains magnesium chloride product, evaporating temperature is 20-130 DEG C.
Further, each component content in the raw material are as follows: NaCl 15-40g/l, KCl 0.3-1.0g/l, NaBr0.05-0.20g/l、MgSO4 1.0-3.0g/l、MgCl2 1.5-5.0g/l。
Further, each component content in the fresh water are as follows: TDS≤500ppm, remaining be H2O。
Further, each component content in the strong brine are as follows: NaCl 60-100g/l, KCl 1.2-2.5g/l, NaBr 0.25-0.5g/l、MgSO4 4.0-7.5g/l、MgCl2 6.0-11.0g/l。
Further, each component content in the debrominate strong brine are as follows: NaCl 60-100g/l, KCl1.2-2.5g/l, MgSO4 4.0-7.5g/l、MgCl2 6.0-11.0g/l。
Further, each component content in the monovalence compound strong brine are as follows: NaCl 60-100g/l, KCl1.2- 2.5g/l、MgSO4 0.2-0.35g/l、MgCl20.6-1.1g/l；Each component content in the bivalent compound strong brine are as follows: NaCl 1-2g/l、KCl 0.12-0.25g/l、MgSO4 40-75g/l、MgCl2 60-110g/l。
Further, each component content in the salt-making mother liquor are as follows: NaCl 100-250g/l, KCl150-250g/l, MgSO4 20-35g/l、MgCl2 80-140g/l。
Further, each component content in the potassium mother liquor processed are as follows: NaCl 250-280g/l, KCl150-200g/l, MgSO4 20-35g/l、MgCl2 80-140g/l。
Further, each component content in the mother liquid of magnesium processed are as follows: NaCl 4-14g/l, KCl 0.72-1.50g/l, MgSO4 4-14g/l、MgCl2 350-600g/l。
Further, the extra large desalination in the step A is using thermal distillation method or reverse osmosis or electrodialytic membranes technology Desalinated.
Further, raw material in step A can be using sodium chloride-containing, magnesium sulfate, potassium chloride, sodium bromide, magnesium chloride Bitter or industrial wastewater are alternative materials.
The beneficial effects of the present invention are: present invention sea desalination and strong brine comprehensively utilize energy saving technique, there is technique Process is reasonable, and heat utilization rate is high, and product quality is high, and production cost and energy consumption are greatly lowered, realize strong brine zero-emission Feature is adapted to extensive extra large desalination.
Detailed description of the invention
Fig. 1 is the process flow diagram of extra large desalination and strong brine comprehensive utilization energy saving technique of the invention.
Specific embodiment
Below with reference to the preferred embodiment specific embodiment that the present invention will be described in detail.
As shown in Figure 1, the present invention provides a kind of extra large desalination and strong brine comprehensive utilization energy saving technique, it includes following Step:
A. take sodium chloride-containing, magnesium sulfate, potassium chloride, sodium bromide, magnesium chloride extra large salt water be raw material, carry out desalt processing, Obtain fresh water and strong brine；Desalt processing is to carry out extra large desalination using thermal distillation method or hyperfiltration or electroosmose process；It is light Changing temperature is 20-130 DEG C；
B. the strong brine is produced into bromine (Br using air blowout method2) and debrominate strong brine；Air blowout method is normal at present The method for extracting bromine, is passed through chlorine to solution, the bromide ion in solution is made to be oxidized to simple substance bromine；Blast hot-air or water Steam can distill out simple substance bromine therein；
C. the debrominate strong brine nanofiltration separation is obtained into monovalence compound strong brine (containing a small amount of bivalent compound) and two Valence compound strong brine (contains a small amount of monovalence compound), and nanofiltration temperature is 20-30 DEG C；
D. monovalence compound strong brine (containing a small amount of bivalent compound) high temperature evaporation is obtained into sodium chloride and salt-making mother liquor, 100-140 DEG C of high temperature evaporation temperature；
E. the salt-making mother liquor low-temperature evaporation is obtained into potassium chloride and potassium mother liquor processed, 20-70 DEG C of low-temperature evaporation temperature；
F. the potassium mother liquor (containing part bivalent compound) processed is recycled to and mixes nanofiltration separation two with debrominate strong brine Valence compound, mixing temperature are 20-30 DEG C；
G. bivalent compound strong brine high temperature evaporation is obtained into magnesium sulfate monohydrate and mother liquid of magnesium processed, high temperature evaporation temperature 70- 140℃；
H. the mother liquid of magnesium processed is concentrated by evaporation cooling and obtains magnesium chloride product, evaporate 20-130 DEG C of cooling temperature.
Enumerating several specific embodiments below, the present invention is described in detail.
Embodiment 1: 900m is taken3Seawater (NaCl 30g/l, KCl 0.72g/l, NaBr 0.14g/l, MgSO42.15g/l、 MgCl23.28g/l) it is raw material, 600 tons of fresh water and 300m is produced using reverse osmosis progress sea water desalination3Strong brine (NaCl 90g/l、KCl 2.16g/l、NaBr 0.42g/l、MgSO4 6.45g/l、MgCl29.84g/l), 30 DEG C of reverse osmosis temperature；It will 300m3Strong brine produces 0.29 ton of bromine (Br using air blowout method2) and 300m3Debrominate strong brine (NaCl 90g/l, KCl 2.16g/l、NaBr 0.015g/l、MgSO46.45g/l、MgCl29.84g/l)；By 300m3Debrominate strong brine (NaCl 90g/ l、KCl 2.16g/l、NaBr0.015g/l、MgSO4 6.45g/l、MgCl29.84g/l) and 3.49m3Potassium mother liquor (NaCl processed 250g/l、KCl 193g/l、MgSO4 26.1g/l、MgCl2303.49m after 87.2g/l) mixing3Mixed liquor nanofiltration separation obtains 278.7m3Monovalence compound strong brine (NaCl 100g/l, KCl 4.7g/l, MgSO4 0.3g/l、MgCl21.0g/l) and 24.79m3Bivalent compound strong brine (NaCl 1.2g/l, KCl 0.12g/l, MgSO4 78.05g/l、MgCl2 119.08g/ L), 25 DEG C of nanofiltration temperature；By 278.7m3Monovalence compound strong brine (NaCl 100g/l, KCl 4.7g/l, MgSO4 0.3g/l、 MgCl21.0g/l) high temperature evaporation obtains 26.96 tons of sodium chloride and 3.82m3Salt-making mother liquor (NaCl 228g/l, KCl 346g/l, MgSO4 23.8g/l、MgCl279.7g/l), 125 DEG C of evaporating temperature；By 3.82m3Salt-making mother liquor low-temperature evaporation obtains 0.63 ton Potassium chloride and 3.49m3Potassium mother liquor (NaCl 250g/l, KCl 193g/l, MgSO processed4 26.1g/l、MgCl287.2g/l)；It will 3.49m3Potassium mother liquor (NaCl 250g/l, KCl 193g/l, MgSO processed4 26.1g/l、MgCl2It 87.2g/l) is recycled to and debrominate Nanofiltration separation bivalent compound is gone in strong brine mixing；By 24.79m3Bivalent compound strong brine (NaCl 1.2g/l, KCl 0.12g/l、MgSO4 78.05g/l、MgCl2119.08g/l) high temperature evaporation obtains 2.05 tons of magnesium sulfate monohydrates and 6.87m3System Mother liquid of magnesium (NaCl 4.33g/l, KCl 0.43g/l, MgSO4 23.4g/l、MgCl2430g/l), 100 DEG C of evaporating temperature；It will 6.87m3Mother liquid of magnesium processed is concentrated by evaporation cooling and obtains 6.91 tons of magnesium chlorides (containing MgCl242.75%).
Embodiment 2: 900m is taken3Seawater (NaCl 30g/l, KCl 0.72g/l, NaBr 0.14g/l, MgSO42.15g/l、 MgCl23.28g/l) it is raw material, sea water desalination is carried out using thermal distillation and produces 600 tons of fresh water and 300m3Strong brine (NaCl 90g/l、KCl 2.16g/l、NaBr 0.42g/l、MgSO4 6.45g/l、MgCl29.84g/l), 80 DEG C of thermal distillation temperature；It will 300m3Strong brine produces 0.29 ton of bromine (Br using air blowout method2) and 300m3Debrominate strong brine (NaCl 90g/l, KCl 2.16g/l、NaBr 0.015g/l、MgSO46.45g/l、MgCl29.84g/l)；By 300m3Debrominate strong brine (NaCl 90g/ l、KCl 2.16g/l、NaBr0.015g/l、MgSO4 6.45g/l、MgCl29.84g/l) and 3.49m3Potassium mother liquor (NaCl processed 250g/l、KCl 193g/l、MgSO4 26.1g/l、MgCl2303.49m after 87.2g/l) mixing3Mixed liquor nanofiltration separation obtains 278.7m3Monovalence compound strong brine (NaCl 100g/l, KCl 4.7g/l, MgSO4 0.3g/l、MgCl21.0g/l) and 24.79m3Bivalent compound strong brine (NaCl 1.2g/l, KCl 0.12g/l, MgSO4 78.05g/l、MgCl2 119.08g/ L), 25 DEG C of nanofiltration temperature；By 278.7m3Monovalence compound strong brine (NaCl 100g/l, KCl 4.7g/l, MgSO4 0.3g/l、 MgCl21.0g/l) high temperature evaporation obtains 26.96 tons of sodium chloride and 3.82m3Salt-making mother liquor (NaCl 228g/l, KCl 346g/l, MgSO4 23.8g/l、MgCl279.7g/l), 125 DEG C of evaporating temperature；By 3.82m3Salt-making mother liquor low-temperature evaporation obtains 0.63 ton Potassium chloride and 3.49m3Potassium mother liquor (NaCl 250g/l, KCl 193g/l, MgSO processed4 26.1g/l、MgCl287.2g/l)；It will 3.49m3Potassium mother liquor (NaCl 250g/l, KCl 193g/l, MgSO processed4 26.1g/l、MgCl2It 87.2g/l) is recycled to and debrominate Nanofiltration separation bivalent compound is gone in strong brine mixing；By 24.79m3Bivalent compound strong brine (NaCl 1.2g/l, KCl 0.12g/l、MgSO4 78.05g/l、MgCl2119.08g/l) high temperature evaporation obtains 2.05 tons of magnesium sulfate monohydrates and 6.87m3System Mother liquid of magnesium (NaCl 4.33g/l, KCl 0.43g/l, MgSO4 23.4g/l、MgCl2430g/l), 100 DEG C of evaporating temperature；It will 6.87m3Mother liquid of magnesium processed is concentrated by evaporation cooling and obtains 6.91 tons of magnesium chlorides (containing MgCl242.75%).
Embodiment 3: 900m is taken3Seawater (NaCl 30g/l, KCl 0.72g/l, NaBr 0.14g/l, MgSO42.15g/l、 MgCl23.28g/l) it is raw material, sea water desalination is carried out using electrodialysis and produces 600 tons of fresh water and 300m3Strong brine (NaCl 90g/l、KCl 2.16g/l、NaBr 0.42g/l、MgSO4 6.45g/l、MgCl29.84g/l), 25 DEG C of electric osmose eutectoid temperature；It will 300m3Strong brine produces 0.29 ton of bromine (Br using air blowout method2) and 300m3Debrominate strong brine (NaCl 90g/l, KCl 2.16g/l、NaBr 0.015g/l、MgSO46.45g/l、MgCl29.84g/l)；By 300m3Debrominate strong brine (NaCl 90g/ l、KCl 2.16g/l、NaBr0.015g/l、MgSO4 6.45g/l、MgCl29.84g/l) and 3.49m3Potassium mother liquor (NaCl processed 250g/l、KCl 193g/l、MgSO4 26.1g/l、MgCl2303.49m after 87.2g/l) mixing3Mixed liquor nanofiltration separation obtains 278.7m3Monovalence compound strong brine (NaCl 100g/l, KCl 4.7g/l, MgSO4 0.3g/l、MgCl21.0g/l) and 24.79m3Bivalent compound strong brine (NaCl 1.2g/l, KCl 0.12g/l, MgSO4 78.05g/l、MgCl2 119.08g/ L), 25 DEG C of nanofiltration temperature；By 278.7m3Monovalence compound strong brine (NaCl 100g/l, KCl 4.7g/l, MgSO4 0.3g/l、 MgCl21.0g/l) high temperature evaporation obtains 26.96 tons of sodium chloride and 3.82m3Salt-making mother liquor (NaCl 228g/l, KCl 346g/l, MgSO4 23.8g/l、MgCl279.7g/l), 125 DEG C of evaporating temperature；By 3.82m3Salt-making mother liquor low-temperature evaporation obtains 0.63 ton Potassium chloride and 3.49m3Potassium mother liquor (NaCl 250g/l, KCl 193g/l, MgSO processed4 26.1g/l、MgCl287.2g/l)；It will 3.49m3Potassium mother liquor (NaCl 250g/l, KCl 193g/l, MgSO processed4 26.1g/l、MgCl2It 87.2g/l) is recycled to and debrominate Nanofiltration separation bivalent compound is gone in strong brine mixing；By 24.79m3Bivalent compound strong brine (NaCl 1.2g/l, KCl 0.12g/l、MgSO4 78.05g/l、MgCl2119.08g/l) high temperature evaporation obtains 2.05 tons of magnesium sulfate monohydrates and 6.87m3System Mother liquid of magnesium (NaCl 4.33g/l, KCl 0.43g/l, MgSO4 23.4g/l、MgCl2430g/l), 100 DEG C of evaporating temperature；It will 6.87m3Mother liquid of magnesium processed is concentrated by evaporation cooling and obtains 6.91 tons of magnesium chlorides (containing MgCl242.75%).
Embodiment 4: 900m is taken3Bitter (NaCl 3g/l, KCl 0.072g/l, NaBr 0.014g/l, MgSO40.215g/l、MgCl20.328g/l) be raw material, using reverse osmosis progresss brackish water desalination produce 870 tons of fresh water with 30m3Strong brine (NaCl 90g/l, KCl 2.16g/l, NaBr 0.42g/l, MgSO4 6.45g/l、MgCl29.84g/l), instead 30 DEG C of temperature of infiltration；By 30m3Strong brine produces 0.029 ton of bromine (Br using air blowout method2) and 30m3Debrominate strong brine (NaCl 90g/l、KCl 2.16g/l、NaBr 0.015g/l、MgSO46.45g/l、MgCl29.84g/l)；By 30m3Debrominate strong brine (NaCl 90g/l、KCl 2.16g/l、NaBr0.015g/l、MgSO4 6.45g/l、MgCl29.84g/l) and 0.349m3Potassium processed Mother liquor (NaCl 250g/l, KCl 193g/l, MgSO4 26.1g/l、MgCl230.349m after 87.2g/l) mixing3Mixed liquor is received Filter isolated 27.87m3Monovalence compound strong brine (NaCl 100g/l, KCl 4.7g/l, MgSO4 0.3g/l、 MgCl21.0g/l) and 2.479m3Bivalent compound strong brine (NaCl 1.2g/l, KCl 0.12g/l, MgSO4 78.05g/l、 MgCl2119.08g/l), 25 DEG C of nanofiltration temperature；By 27.87m3Monovalence compound strong brine (NaCl 100g/l, KCl 4.7g/ l、MgSO4 0.3g/l、MgCl21.0g/l) high temperature evaporation obtains 2.696 tons of sodium chloride and 0.382m3Salt-making mother liquor (NaCl 228g/l、KCl 346g/l、MgSO4 23.8g/l、MgCl279.7g/l), 125 DEG C of evaporating temperature；By 0.382m3Salt-making mother liquor Low-temperature evaporation obtains 0.063 ton of potassium chloride and 0.349m3Potassium mother liquor (NaCl 250g/l, KCl 193g/l, MgSO processed4 26.1g/ l、MgCl287.2g/l)；By 0.349m3Potassium mother liquor (NaCl 250g/l, KCl 193g/l, MgSO processed4 26.1g/l、MgCl2 It 87.2g/l) is recycled to and mixes nanofiltration separation bivalent compound with debrominate strong brine；By 2.479m3Bivalent compound strong brine (NaCl1.2g/l、KCl 0.12g/l、MgSO4 78.05g/l、MgCl2119.08g/l) high temperature evaporation obtains 0.205 ton of one water Magnesium sulfate and 0.687m3Mother liquid of magnesium (NaCl 4.33g/l, KCl 0.43g/l, MgSO processed4 23.4g/l、MgCl2430g/l), 100 DEG C of evaporating temperature；By 0.687m3Mother liquid of magnesium processed is concentrated by evaporation cooling and obtains 0.691 ton of magnesium chloride (containing MgCl242.75%).
Embodiment 5: 900m is taken3Bitter (NaCl 3g/l, KCl 0.072g/l, NaBr 0.014g/l, MgSO40.215g/l、MgCl20.328g/l) be raw material, using thermal distillation carry out brackish water desalination produce 870 tons of fresh water and 30m3Strong brine (NaCl 90g/l, KCl 2.16g/l, NaBr 0.42g/l, MgSO4 6.45g/l、MgCl29.84g/l), hot 80 DEG C of vapo(u)rizing temperature；By 30m3Strong brine produces 0.029 ton of bromine (Br using air blowout method2) and 30m3Debrominate strong brine (NaCl 90g/l、KCl 2.16g/l、NaBr 0.015g/l、MgSO46.45g/l、MgCl29.84g/l)；By 30m3Debrominate strong brine (NaCl 90g/l、KCl 2.16g/l、NaBr0.015g/l、MgSO4 6.45g/l、MgCl29.84g/l) and 0.349m3Potassium processed Mother liquor (NaCl 250g/l, KCl 193g/l, MgSO4 26.1g/l、MgCl230.349m after 87.2g/l) mixing3Mixed liquor is received Filter isolated 27.87m3Monovalence compound strong brine (NaCl 100g/l, KCl 4.7g/l, MgSO4 0.3g/l、 MgCl21.0g/l) and 2.479m3Bivalent compound strong brine (NaCl 1.2g/l, KCl 0.12g/l, MgSO4 78.05g/l、 MgCl2119.08g/l), 25 DEG C of nanofiltration temperature；By 27.87m3Monovalence compound strong brine (NaCl 100g/l, KCl 4.7g/ l、MgSO4 0.3g/l、MgCl21.0g/l) high temperature evaporation obtains 2.696 tons of sodium chloride and 0.382m3Salt-making mother liquor (NaCl 228g/l、KCl 346g/l、MgSO4 23.8g/l、MgCl279.7g/l), 125 DEG C of evaporating temperature；By 0.382m3Salt-making mother liquor Low-temperature evaporation obtains 0.063 ton of potassium chloride and 0.349m3Potassium mother liquor (NaCl 250g/l, KCl 193g/l, MgSO processed4 26.1g/ l、MgCl287.2g/l)；By 0.349m3Potassium mother liquor (NaCl 250g/l, KCl 193g/l, MgSO processed4 26.1g/l、MgCl2 It 87.2g/l) is recycled to and mixes nanofiltration separation bivalent compound with debrominate strong brine；By 2.479m3Bivalent compound strong brine (NaCl1.2g/l、KCl 0.12g/l、MgSO4 78.05g/l、MgCl2119.08g/l) high temperature evaporation obtains 0.205 ton of one water Magnesium sulfate and 0.687m3Mother liquid of magnesium (NaCl 4.33g/l, KCl 0.43g/l, MgSO processed4 23.4g/l、MgCl2430g/l), 100 DEG C of evaporating temperature；By 0.687m3Mother liquid of magnesium processed is concentrated by evaporation cooling and obtains 0.691 ton of magnesium chloride (containing MgCl242.75%).
Embodiment 6: 900m is taken3Bitter (NaCl 3g/l, KCl 0.072g/l, NaBr 0.014g/l, MgSO40.215g/l、MgCl20.328g/l) be raw material, using electrodialysis carry out brackish water desalination produce 870 tons of fresh water and 30m3Strong brine (NaCl 90g/l, KCl 2.16g/l, NaBr 0.42g/l, MgSO4 6.45g/l、MgCl29.84g/l), electric 25 DEG C of dialysis temperature；By 30m3Strong brine produces 0.029 ton of bromine (Br using air blowout method2) and 30m3Debrominate strong brine (NaCl 90g/l、KCl 2.16g/l、NaBr 0.015g/l、MgSO46.45g/l、MgCl29.84g/l)；By 30m3Debrominate strong brine (NaCl 90g/l、KCl 2.16g/l、NaBr0.015g/l、MgSO4 6.45g/l、MgCl29.84g/l) and 0.349m3Potassium processed Mother liquor (NaCl 250g/l, KCl 193g/l, MgSO4 26.1g/l、MgCl230.349m after 87.2g/l) mixing3Mixed liquor is received Filter isolated 27.87m3Monovalence compound strong brine (NaCl 100g/l, KCl 4.7g/l, MgSO4 0.3g/l、 MgCl21.0g/l) and 2.479m3Bivalent compound strong brine (NaCl 1.2g/l, KCl 0.12g/l, MgSO4 78.05g/l、 MgCl2119.08g/l), 25 DEG C of nanofiltration temperature；By 27.87m3Monovalence compound strong brine (NaCl 100g/l, KCl 4.7g/ l、MgSO4 0.3g/l、MgCl21.0g/l) high temperature evaporation obtains 2.696 tons of sodium chloride and 0.382m3Salt-making mother liquor (NaCl 228g/l、KCl 346g/l、MgSO4 23.8g/l、MgCl279.7g/l), 125 DEG C of evaporating temperature；By 0.382m3Salt-making mother liquor Low-temperature evaporation obtains 0.063 ton of potassium chloride and 0.349m3Potassium mother liquor (NaCl 250g/l, KCl 193g/l, MgSO processed4 26.1g/ l、MgCl287.2g/l)；By 0.349m3Potassium mother liquor (NaCl 250g/l, KCl 193g/l, MgSO processed4 26.1g/l、MgCl2 It 87.2g/l) is recycled to and mixes nanofiltration separation bivalent compound with debrominate strong brine；By 2.479m3Bivalent compound strong brine (NaCl1.2g/l、KCl 0.12g/l、MgSO4 78.05g/l、MgCl2119.08g/l) high temperature evaporation obtains 0.205 ton of one water Magnesium sulfate and 0.687m3Mother liquid of magnesium (NaCl 4.33g/l, KCl 0.43g/l, MgSO processed4 23.4g/l、MgCl2430g/l), 100 DEG C of evaporating temperature；By 0.687m3Mother liquid of magnesium processed is concentrated by evaporation cooling and obtains 0.691 ton of magnesium chloride (containing MgCl242.75%).
The present invention has process flow reasonable, and heat utilization rate is high, and product quality is high, and production cost and energy consumption significantly drop It is low, realize the characteristics of strong brine zero-emission, be adapted to extensive extra large desalination.
The above described is only a preferred embodiment of the present invention, not making in any form to structure of the invention Limitation.Any simple modification, equivalent change and modification to the above embodiments according to the technical essence of the invention, In the range of still falling within technical solution of the present invention.

Claims (10)

1. a kind of sea desalination and strong brine comprehensively utilize energy saving technique, which is characterized in that it includes the following steps:
A. take sodium chloride-containing, magnesium sulfate, potassium chloride, sodium bromide, magnesium chloride extra large salt water be raw material, carry out extra large desalination, it is light Changing temperature is 20-130 DEG C, obtains fresh water and strong brine；
B. by the strong brine using air blowout method production bromine and debrominate strong brine；
C. the debrominate strong brine nanofiltration separation is obtained into monovalence compound strong brine and bivalent compound strong brine, nanofiltration temperature is 20--30℃；
D. monovalence strong brine high temperature evaporation is obtained into sodium chloride and salt-making mother liquor, evaporating temperature is 100-140 DEG C；
E. the salt-making mother liquor low-temperature evaporation is obtained into potassium chloride and potassium mother liquor processed, evaporating temperature is 20-70 DEG C；
F. by the potassium Recycling Mother Solution processed to step C, nanofiltration is mixed and carried out with debrominate strong brine, and mixing temperature is 20-30 DEG C；
G. divalent strong brine high temperature evaporation is obtained into magnesium sulfate monohydrate and mother liquid of magnesium processed, evaporating temperature is 70-140 DEG C；
H. the mother liquid of magnesium processed is concentrated by evaporation cooling and obtains magnesium chloride product, evaporating temperature is 20-130 DEG C.
2. sea desalination according to claim 1 and strong brine comprehensively utilize energy saving technique, which is characterized in that the original Each component content in material are as follows: NaCl 15-40g/l, KCl 0.3-1.0g/l, NaBr 0.05-0.20g/l, MgSO4 1.0- 3.0g/l、MgCl2 1.5-5.0g/l。
3. sea desalination according to claim 1 and strong brine comprehensively utilize energy saving technique, which is characterized in that described light Each component content in water are as follows: TDS≤500ppm, remaining be H2O。
4. sea desalination according to claim 1 and strong brine comprehensively utilize energy saving technique, which is characterized in that described dense Each component content in salt water are as follows: NaCl 60-100g/l, KCl 1.2-2.5g/l, NaBr 0.25-0.5g/l, MgSO4 4.0- 7.5g/l、MgCl2 6.0-11.0g/l。
5. sea desalination according to claim 1 and strong brine comprehensively utilize energy saving technique, which is characterized in that described de- Each component content in bromine strong brine are as follows: NaCl 60-100g/l, KCl 1.2-2.5g/l, MgSO4 4.0-7.5g/l、MgCl2 6.0-11.0g/l。
6. sea desalination according to claim 1 and strong brine comprehensively utilize energy saving technique, which is characterized in that described one Each component content in valence compound strong brine are as follows: NaCl 60-100g/l, KCl 1.2-2.5g/l, MgSO4 0.2-0.35g/l、 MgCl20.6-1.1g/l；Each component content in the bivalent compound strong brine are as follows: NaCl 1-2g/l, KCl 0.12- 0.25g/l、MgSO4 40-75g/l、MgCl2 60-110g/l。
7. sea desalination according to claim 1 and strong brine comprehensively utilize energy saving technique, which is characterized in that the system Each component content in salt mother liquor are as follows: NaCl 100-250g/l, KCl 150-250g/l, MgSO4 20-35g/l、MgCl2 80- 140g/l。
8. sea desalination according to claim 1 and strong brine comprehensively utilize energy saving technique, which is characterized in that the system Each component content in potassium mother liquor are as follows: NaCl 250-280g/l, KCl 150-200g/l, MgSO4 20-35g/l、MgCl2 80- 140g/l。
9. sea desalination according to claim 1 and strong brine comprehensively utilize energy saving technique, which is characterized in that the system Each component content in mother liquid of magnesium are as follows: NaCl 4-14g/l, KCl 0.72-1.50g/l, MgSO4 4-14g/l、MgCl2 350- 600g/l。
10. sea desalination according to claim 1 and strong brine comprehensively utilize energy saving technique, which is characterized in that described Extra large desalination in step A is desalinated using thermal distillation method or reverse osmosis or electrodialytic membranes technology.
CN201810795629.8A 2018-07-19 2018-07-19 It is a kind of sea desalination and strong brine comprehensively utilize energy saving technique Pending CN109020021A (en)

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US11502323B1 (en) 2022-05-09 2022-11-15 Rahul S Nana Reverse electrodialysis cell and methods of use thereof
US11502322B1 (en) 2022-05-09 2022-11-15 Rahul S Nana Reverse electrodialysis cell with heat pump
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