CN107473247B - A kind of brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique - Google Patents
A kind of brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique Download PDFInfo
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- 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
- C01F5/14—Magnesium hydroxide
- C01F5/22—Magnesium hydroxide from magnesium compounds with alkali hydroxides or alkaline- earth oxides or hydroxides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
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- 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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/02—Preparation by double decomposition
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Abstract
A kind of brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique, taking brackish water desalination by-product effluent brine is raw material, and caustic soda is added in the concentrated mother liquor of the abraum salt water evaporation and reacts to obtain magnesium hydroxide and mother liquid of magnesium processed；Mother liquid of magnesium processed mixes addition potassium chloride with salt-making mother liquor and two step mother liquors and water carries out a step double decomposition normal-temperature reaction and obtains glaserite intermediate products and a step mother liquor；One step mother liquor mixing high temperature evaporation obtains sodium chloride and salt-making mother liquor；Potassium chloride is added in glaserite intermediate products and water carries out two step double decomposition normal-temperature reactions and obtains potassium product and two step mother liquors；Salt-making mother liquor and two step Recycling Mother Solutions to a step double decomposition normal-temperature reaction；Sodium chloride reacts to obtain magnesium hydroxide products and mother liquid of magnesium processed for producing caustic soda, concentrated mother liquor of the caustic soda of production for abraum salt water evaporation.The circular economies feature such as the innovation of present invention process process, products scheme is reasonable, adaptability to raw material is strong, cost and low energy consumption, three-waste free discharge, closed cycle.
Description
Technical field
The present invention relates to technical field of inorganic chemical industry, and especially one kind is with NaCl-MgSO4-KCl-H2O system bitter
Desalinating by-product effluent brine is the circular economy technique that raw material produces magnesium hydroxide, potassium sulfate, sodium chloride and caustic soda.
Background technique
The components brackish water desalination by-product such as known saliferous, magnesium sulfate, potassium chloride effluent brine is usually outer to be discharged into sea, however this
Method is only applicable to coastal area, and the above method is for Northwest inland area brackish water desalination by-product effluent brine and is not suitable for, meeting
Cause the situation of circulation wetland with saline-alkaline.The desalination by-product of the bitters of components such as these regional saliferous, magnesium sulfate, potassium chloride is useless
Salt water needs to solve the problems, such as to separate salt, magnesium sulfate, the inorganic salts such as potassium chloride, therefore, it is highly desirable find one rationally, it is economical,
Meet the process route of the Northwest's actual conditions.
Summary of the invention
The object of the present invention is to provide a kind of brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy techniques, have
Process flow innovation, products scheme is reasonable, adaptability to raw material is strong, cost and low energy consumption, three-waste free discharge, the circulation such as closed cycle
Economic traits.
To achieve the above object, the present invention takes following technical scheme:
A kind of brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique, takes brackish water desalination by-product effluent brine
For raw material, caustic soda is added in the concentrated mother liquor of the abraum salt water evaporation (20-150 DEG C of evaporating temperature) and carries out normal-temperature reaction (when reaction
Between 0.2-4 hours) obtain magnesium hydroxide products and mother liquid of magnesium processed；Mother liquid of magnesium processed is mixed with salt-making mother liquor and two step mother liquors is added chlorine
Change potassium and water carries out a step double decomposition normal-temperature reaction (reaction time 0.2-4 hour) and obtains glaserite intermediate products and step mother
Liquid；One step mother liquor mixing high temperature evaporation (70-150 DEG C of evaporating temperature) obtains sodium chloride and salt-making mother liquor；Glaserite intermediate products
Potassium chloride is added and water carries out two step double decomposition normal-temperature reactions (reaction time 0.2-4 hour) and obtains potassium product and two steps mother
Liquid；Salt-making mother liquor and two step Recycling Mother Solutions to a step double decomposition normal-temperature reaction；Sodium chloride is used for producing caustic soda, the caustic soda of production
Normal-temperature reaction, which is carried out, in the concentrated mother liquor of abraum salt water evaporation obtains magnesium hydroxide products and mother liquid of magnesium processed.
Further, NaCl, KCl and MgSO are contained in the bitter4。
Further, in the effluent brine each component content are as follows: NaCl 30.00-150g/l, MgSO4 15.0-
75.0g/l、KCl 1.0-5.3g/l。
Further, in the concentrated mother liquor of the abraum salt water evaporation each component content are as follows: NaCl 180-270g/l,
MgSO4 90-135g/l、KCl 6.0-10.0g/l。
Further, in the mother liquid of magnesium processed each component content are as follows: NaCl 180-270g/l, Na2SO4 106-160g/
l、KCl 6.0-10.0g/l。
Further, in the magnesium hydroxide each component content are as follows: Mg (OH)298-99.6%.
Further, in a step mother liquor each component content are as follows: NaCl 215-345g/l, Na2SO4 45-100g/
l、KCl 60-135g/l。
Further, in the glaserite each component content are as follows: Na2SO416.87%, K2SO483.13%.
Further, in the sodium chloride each component content are as follows: NaCl 98-99.6%.
Further, in the salt-making mother liquor each component content are as follows: NaCl 200-300g/l, Na2SO4 50-120g/
l、KCl 80-180g/l。
Further, in the two steps mother liquor each component content are as follows: NaCl 70-115g/l, Na2SO4 35-90g/l、
KCl 100-300g/l。
The alternative of bitter of the present invention be also possible to other contain a small amount of calcium sulfate, magnesium chloride, potassium sulfate, calcium chloride and
The bitter system solution of sodium sulphate.
The beneficial effects of the present invention are: present invention process process is innovated, products scheme is reasonable, adaptability to raw material is strong, cost
With low energy consumption, three-waste free discharge, closed cycle, the components bitters such as Northwest inland area saliferous, magnesium sulfate, potassium chloride can be solved
Desalination by-product effluent brine separation salt, magnesium sulfate, the inorganic salts such as potassium chloride the problem of, obtain preferable comprehensive utilization and circulation warp
Ji effect.
Detailed description of the invention
Fig. 1 is the process flow chart of brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique of the present invention.
Specific embodiment
In order to which technical solution of the present invention and beneficial effect is more clearly understood, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
As shown in Figure 1, the present invention provides a kind of brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique, take
Brackish water desalination by-product effluent brine is raw material, and caustic soda progress normal-temperature reaction is added in the concentrated mother liquor of the abraum salt water evaporation and obtains hydrogen
Magnesium oxide product and mother liquid of magnesium processed；Mother liquid of magnesium processed mixes addition potassium chloride with salt-making mother liquor and two step mother liquors and water carries out a step and answers
It decomposes normal-temperature reaction and obtains glaserite intermediate products and a step mother liquor；One step mother liquor mixing high temperature evaporation obtains sodium chloride and salt manufacturing
Mother liquor；Potassium chloride is added in glaserite intermediate products and water carries out two step double decomposition normal-temperature reactions and obtains potassium product and two steps mother
Liquid；Salt-making mother liquor and two step Recycling Mother Solutions to a step double decomposition normal-temperature reaction；Sodium chloride removes production process of caustic soda, the caustic soda of production
Concentrated mother liquor for abraum salt water evaporation carries out normal-temperature reaction and obtains magnesium hydroxide products and mother liquid of magnesium processed.It lifts below several specific
The present invention is described in more detail for embodiment.
Embodiment 1: 1000m is taken3Brackish water desalination by-product effluent brine (30.00g/l containing NaCl, MgSO4 15.00g/l、
KCl 1.00g/l) it is raw material, which is obtained into 125m3Concentrated mother liquor (240g/ containing NaCl
l、MgSO4120g/l, KCl 8.0g/l) it 10 tons of caustic soda (NaOH) is added carries out normal-temperature reaction (2 hours reaction time) and obtain
7.25 tons of magnesium hydroxide products and 125m3Mother liquid of magnesium (NaCl 240g/l, Na processed2SO4142g/l,KCl 8.0g/l)；125m3
Mother liquid of magnesium processed mixes with circulation salt-making mother liquor and two step mother liquors of circulation and 13.875 tons of potassium chloride and water one step double decomposition of progress is added
Normal-temperature reaction (2 hours reaction time) obtains 48.9375 tons of glaserite intermediate products and a step mother liquor；One step mother liquor mixing high temperature
Evaporation (100 DEG C of evaporating temperature) obtains 44.50 tons of sodium chloride and salt-making mother liquor；48.9375 ton glaserite intermediate products are added
6.9375 potassium chloride and water carry out two step double decomposition normal-temperature reactions (2 hours reaction time) obtain 21.75 tons of potassium products and
Two step mother liquors；Salt-making mother liquor and two step Recycling Mother Solutions to a step double decomposition normal-temperature reaction；44.50 tons of sodium chloride alkalines obtain
30.69 tons of caustic soda products, wherein 10 tons of caustic soda, which carry out normal-temperature reaction for the concentrated mother liquor of abraum salt water evaporation, obtains magnesium hydroxide
Product and mother liquid of magnesium processed.
Embodiment 2: 1000m is taken3Brackish water desalination by-product effluent brine (150.00g/l containing NaCl, MgSO4 75.00g/l、
KCl 5.00g/l) it is raw material, which is obtained into 625m3Concentrated mother liquor (contains NaCl
240g/l、MgSO4120g/l, KCl 8.0g/l) 50 tons of caustic soda (NaOH) progress normal-temperature reaction (2 hours reaction time) are added
Obtain 36.25 tons of magnesium hydroxide products and 625m3Mother liquid of magnesium (NaCl 240g/l, Na processed2SO4142g/l,KCl 8.0g/l)；
625m3Mother liquid of magnesium processed mixes 69.375 tons of potassium chloride of addition with circulation salt-making mother liquor and two step mother liquors of circulation and water carries out a step and answers
Decomposition normal-temperature reaction (2 hours reaction time) obtains 244.6875 tons of glaserite intermediate products and a step mother liquor；One step mother liquor is mixed
It closes high temperature evaporation (100 DEG C of evaporating temperature) and obtains 222.5 tons of sodium chloride and salt-making mother liquor；244.6875 ton glaserite intermediate products
34.6875 potassium chloride are added and water progress two step double decomposition normal-temperature reactions (2 hours reaction time) obtains 108.75 tons of potassium sulfates
Product and two step mother liquors；Salt-making mother liquor and two step Recycling Mother Solutions to a step double decomposition normal-temperature reaction；222.5 tons of sodium chloride alkalines obtain
To 153.45 tons of caustic soda products, wherein 50 tons of caustic soda, which carry out normal-temperature reaction for the concentrated mother liquor of abraum salt water evaporation, obtains hydroxide
Magnesium products and mother liquid of magnesium processed.
Embodiment 3: 1000m is taken3Brackish water desalination by-product effluent brine (90.00g/l containing NaCl, MgSO4 45.00g/l、
KCl 3.00g/l) it is raw material, which is obtained into 375m3Concentrated mother liquor (240g/ containing NaCl
l、MgSO4120g/l, KCl 8.0g/l) it 30 tons of caustic soda (NaOH) is added carries out normal-temperature reaction (2 hours reaction time) and obtain
21.75 tons of magnesium hydroxide products and 375m3Mother liquid of magnesium (NaCl 240g/l, Na processed2SO4142g/l,KCl 8.0g/l)；375m3
Mother liquid of magnesium processed mixes with circulation salt-making mother liquor and two step mother liquors of circulation and 41.625 tons of potassium chloride and water one step double decomposition of progress is added
Normal-temperature reaction (2 hours reaction time) obtains 146.8125 tons of glaserite intermediate products and a step mother liquor；The mixing of one step mother liquor is high
Temperature evaporation (100 DEG C of evaporating temperature) obtains 133.5 tons of sodium chloride and salt-making mother liquor；146.8125 ton glaserite intermediate products are added
20.8125 potassium chloride and water carry out two step double decomposition normal-temperature reactions (2 hours reaction time) obtain 65.25 tons of potassium products and
Two step mother liquors；Salt-making mother liquor and two step Recycling Mother Solutions to a step double decomposition normal-temperature reaction；133.5 tons of sodium chloride alkalines obtain
92.07 tons of caustic soda products, wherein 30 tons of caustic soda, which carry out normal-temperature reaction for the concentrated mother liquor of abraum salt water evaporation, obtains magnesium hydroxide
Product and mother liquid of magnesium processed.
Embodiment 4: 1000m is taken3Brackish water desalination by-product effluent brine (60.00g/l containing NaCl, MgSO4 30.00g/l、
KCl 2.00g/l) it is raw material, which is obtained into 250m3Concentrated mother liquor (240g/ containing NaCl
l、MgSO4120g/l, KCl 8.0g/l) it 20 tons of caustic soda (NaOH) is added carries out normal-temperature reaction (2 hours reaction time) and obtain
14.5 tons of magnesium hydroxide products and 250m3Mother liquid of magnesium (NaCl 240g/l, Na processed2SO4142g/l,KCl 8.0g/l)；250m3
Mother liquid of magnesium processed mixes 27.75 tons of potassium chloride of addition with circulation salt-making mother liquor and two step mother liquors of circulation and water one step double decomposition of progress is normal
Temperature reaction (2 hours reaction time) obtains 97.875 tons of glaserite intermediate products and a step mother liquor；One step mother liquor mixing high temperature steams
Hair (100 DEG C of evaporating temperature) obtains 89.00 tons of sodium chloride and salt-making mother liquor；97.875 tons of glaserite intermediate products are added 13.875
Potassium chloride and water progress two step double decomposition normal-temperature reactions (2 hours reaction time) obtain 43.5 tons of potassium products and two steps are female
Liquid；Salt-making mother liquor and two step Recycling Mother Solutions to a step double decomposition normal-temperature reaction；89.00 tons of sodium chloride alkalines obtain 61.38 tons of burnings
Alkali product, wherein 20 tons of caustic soda, which carry out normal-temperature reaction for the concentrated mother liquor of abraum salt water evaporation, obtains magnesium hydroxide products and magnesium processed
Mother liquor.
Embodiment 5: 1000m is taken3Brackish water desalination by-product effluent brine (120.00g/l containing NaCl, MgSO4 60.00g/l、
KCl 4.00g/l) it is raw material, which is obtained into 500m3Concentrated mother liquor (240g/ containing NaCl
l、MgSO4120g/l, KCl 8.0g/l) it 40 tons of caustic soda (NaOH) is added carries out normal-temperature reaction (2 hours reaction time) and obtain
29.0 tons of magnesium hydroxide products and 500m3Mother liquid of magnesium (NaCl 240g/l, Na processed2SO4142g/l,KCl 8.0g/l)；500m3
Mother liquid of magnesium processed mixes 55.5 tons of potassium chloride of addition with circulation salt-making mother liquor and two step mother liquors of circulation and water one step double decomposition of progress is normal
Temperature reaction (2 hours reaction time) obtains 195.75 tons of glaserite intermediate products and a step mother liquor；One step mother liquor mixing high temperature steams
Hair (100 DEG C of evaporating temperature) obtains 178.0 tons of sodium chloride and salt-making mother liquor；195.75 tons of glaserite intermediate products are added 27.75
Potassium chloride and water progress two step double decomposition normal-temperature reactions (2 hours reaction time) obtain 87.0 tons of potassium products and two steps are female
Liquid；Salt-making mother liquor and two step Recycling Mother Solutions to a step double decomposition normal-temperature reaction；178.0 tons of sodium chloride alkalines obtain 122.76 tons of burnings
Alkali product, wherein 40 tons of caustic soda, which carry out normal-temperature reaction for the concentrated mother liquor of abraum salt water evaporation, obtains magnesium hydroxide products and magnesium processed
Mother liquor.
Embodiment 6: 1000m is taken3Brackish water desalination by-product effluent brine (45.00g/l containing NaCl, MgSO4 22.5g/l、KCl
It is 1.50g/l) raw material, which is obtained into 187.5m3Concentrated mother liquor (240g/l containing NaCl,
MgSO4120g/l, KCl 8.0g/l) it 15 tons of caustic soda (NaOH) is added carries out normal-temperature reaction (2 hours reaction time) and obtain
10.875 ton magnesium hydroxide products and 187.5m3Mother liquid of magnesium (NaCl 240g/l, Na processed2SO4142g/l,KCl 8.0g/l)；
187.5m3Mother liquid of magnesium processed mixes with circulation salt-making mother liquor and two step mother liquors of circulation and 20.8125 tons of potassium chloride and water progress one is added
Step double decomposition normal-temperature reaction (2 hours reaction time) obtains 73.41 tons of glaserite intermediate products and a step mother liquor；One step mother liquor is mixed
It closes high temperature evaporation (100 DEG C of evaporating temperature) and obtains 66.75 tons of sodium chloride and salt-making mother liquor；73.41 tons of glaserite intermediate products add
Enter 10.41 potassium chloride and water progress two step double decomposition normal-temperature reactions (2 hours reaction time) obtains 33.625 tons of potassium products
With two step mother liquors；Salt-making mother liquor and two step Recycling Mother Solutions to a step double decomposition normal-temperature reaction；66.75 tons of sodium chloride alkalines obtain
46.035 tons of caustic soda products, wherein 15 tons of caustic soda, which carry out normal-temperature reaction for the concentrated mother liquor of abraum salt water evaporation, obtains magnesium hydroxide
Product and mother liquid of magnesium processed.
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 (9)
1. a kind of brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique, which is characterized in that take brackish water desalination
By-product effluent brine is raw material, the content of each component in the effluent brine are as follows: NaCl 30.00-150g/l, MgSO4 15.0-
75.0g/l,KCl 1.0-5.3g/l；The concentrated mother liquor that the effluent brine is evaporated at 20-150 DEG C is added caustic soda and carries out often
Temperature reaction, reaction time 0.2-4 hour obtain magnesium hydroxide products and mother liquid of magnesium processed；Mother liquid of magnesium processed and salt-making mother liquor and two steps
Potassium chloride is added in mother liquor mixing and water carries out a step double decomposition normal-temperature reaction, in reaction time 0.2-4 hour, obtains among glaserite
Product and a step mother liquor；One step mother liquor mixing high temperature evaporation, obtains sodium chloride and salt-making mother liquor by 70-150 DEG C of evaporating temperature；Potassium
Potassium chloride is added in saltcake intermediate products and water carries out two step double decomposition normal-temperature reactions, in reaction time 0.2-4 hour, obtains potassium sulfate
Product and two step mother liquors；Salt-making mother liquor and two step Recycling Mother Solutions to a step double decomposition normal-temperature reaction；Sodium chloride is used to produce caustic soda,
The caustic soda of production carries out normal-temperature reaction for the concentrated mother liquor of abraum salt water evaporation and obtains magnesium hydroxide products and mother liquid of magnesium processed.
2. brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique according to claim 1, it is characterised in that:
The content of each component in the concentrated mother liquor of the abraum salt water evaporation are as follows: NaCl 180-270g/l, MgSO4 90-135g/l、KCl
6.0-10.0g/l。
3. brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique according to claim 1, it is characterised in that:
The content of each component in the mother liquid of magnesium processed are as follows: NaCl 180-270g/l, Na2SO4 106-160g/l、KCl 6.0-10.0g/
l。
4. brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique according to claim 1, it is characterised in that:
The content of each component in the one step mother liquor are as follows: NaCl 215-345g/l, Na2SO4 45-100g/l、KCl 60-135g/l。
5. brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique according to claim 1, it is characterised in that:
The content of each component in the glaserite are as follows: Na2SO416.87%, K2SO483.13%.
6. brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique according to claim 1, it is characterised in that:
The content of each component in the sodium chloride are as follows: NaCl 98-99.6%.
7. brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique according to claim 1, it is characterised in that:
The content of each component in the salt-making mother liquor are as follows: NaCl 200-300g/l, Na2SO4 50-120g/l、KCl 80-180g/l。
8. brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique according to claim 1, it is characterised in that:
The content of each component in the two steps mother liquor are as follows: NaCl 70-115g/l, Na2SO4 35-90g/l、KCl 100-300g/l。
9. brackish water desalination effluent brine magnesium sylvite alkali coproduction circular economy technique according to claim 1, it is characterised in that:
Also contain calcium sulfate, magnesium chloride, potassium sulfate, calcium chloride and sodium sulphate in the raw material.
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| US3598522A (en) * | 1968-07-18 | 1971-08-10 | Nat Lead Co | Conversion of potassium-magnesium double salts into kainite |
| CN1214980C (en) * | 2003-06-07 | 2005-08-17 | 程培胜 | New method for coproducing sodium carbonate, potassium sulfate and ammonium chloride |
| CN101327940B (en) * | 2007-06-21 | 2012-02-01 | 天津长芦海晶集团有限公司 | Process for preparing solar salt from purified saturated bittern as raw material |
| CN105819401A (en) * | 2016-03-18 | 2016-08-03 | 中国中轻国际工程有限公司 | LNG cold energy seawater desalination and concentrated saltwater comprehensive utilization technology |
| CN106315626A (en) * | 2016-08-23 | 2017-01-11 | 中国中轻国际工程有限公司 | Process for producing sodium chloride and magnesium sulfate heptahydrate from brackish water desalination by-product strong brine |
| CN106690246A (en) * | 2016-12-06 | 2017-05-24 | 中国中轻国际工程有限公司 | Technology of producing green liquid edible salt using brine and the green liquid edible salt |
| CN106745115A (en) * | 2017-01-19 | 2017-05-31 | 中国中轻国际工程有限公司 | Calcium and magnesium mud production magnesium sulfate and the calcium carbonate technique of a kind of utilization bittern purifying |
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