CN102515204A - Device for producing salt by brine-mixing and evaporation method with concentrated seawater by-product of seawater desalination as raw material and method thereof - Google Patents
Device for producing salt by brine-mixing and evaporation method with concentrated seawater by-product of seawater desalination as raw material and method thereof Download PDFInfo
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- CN102515204A CN102515204A CN2011104112708A CN201110411270A CN102515204A CN 102515204 A CN102515204 A CN 102515204A CN 2011104112708 A CN2011104112708 A CN 2011104112708A CN 201110411270 A CN201110411270 A CN 201110411270A CN 102515204 A CN102515204 A CN 102515204A
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Abstract
The invention relates to a device for producing salt by a brine-mixing and evaporation method with a concentrated seawater by-product of seawater desalination as a raw material and a method thereof. The method provided by the invention comprises the following steps of: putting 10 unit volumes of concentrated seawater of 5-12 baume degrees, 2.2-2.5 unit volumes of bitter brine of 28-29 baume degrees and 0.26-0.27 unit volumes of salt slurry into a static mixer H, wherein with the salt slurry as the reference for volume ratio, sodium chloride accounts for 45-50% and bitter brine accounts for 50-55%; mixing brine by the use of the static mixer at room temperature and normal pressure to obtain mixed brine; settling the mixed brine by the use of a settler, forming a solid phase of calcium sulfate, precipitating calcium sulfate from the mixed brine to obtain a calcium sulfate product; allowing the calcium sulfate product to enter into an evaporating pot for evaporation concentration when the concentration of the mixed brine in the settler is baume degrees, continuously precipitating a sodium chloride solid while evaporating water, and carrying out solid-liquid separation on the salt slurry by the use of a centrifuge H to obtain the sodium chloride product. Concentrated seawater discharged from a seawater desalination factory has been completely utilized. Therefore, zero discharge is realized. Pollution of concentrated seawater to the ocean or occupation of large areas for drying brine is avoided.
Description
Technical field
The present invention relates to the comprehensive utilization of sea water desaltination by-product concentrated seawater, the concentrated seawater that relates in particular to the sea water desaltination by-product is that the device and method of halogen method of evaporation salt manufacturing is converted in the raw material employing.
Background technology
The method that adopts desalination technology to produce fresh water by seawater has been used decades all over the world.In recent years, also obtained fast development in China.
Desalination technology is a large amount of concentrated seawater (the about 5 ° of B é～12 ° B é of concentration) of by-product when producing fresh water, and saltiness is higher 1～3 times than seawater.The concentrated seawater of existing desalinator institute by-product basically all returns the sea owing to when continuing evaporation concentration, can not solve the calcium sulfate scaling problem, and very big pollution is caused in the ocean.
Recent years; Domestic newly-built sea water desaltination factory site is all selected to build near the saltern; After concentrated seawater enters the salt pan; (be called for short: Exposure to Sunlight system halogen) about the concentration enrichment to 25.5 of concentrated seawater ° B é, the calcium sulfate in the concentrated seawater has been separated out more than 85% and is just saturated to sodium-chlor at this moment with the method for Exposure to Sunlight.The saturated bittern of sodium-chlor is introduced in the crystallizing pond with the method salt manufacturing of Exposure to Sunlight, also can be introduced the method salt manufacturing of factory with evaporation concentration.
The ocean is polluted or land occupation area Exposure to Sunlight system halogen for fear of concentrated seawater; Chemicals such as the sodium-chlor that contains in the extraction concentrated seawater, Repone K, magnesium chloride, sal epsom, industrial bromine, calcium sulfate, the various countries expert extracts the Chemicals in the concentrated seawater in research with the method for batch production.But owing to contain a certain amount of calcium sulfate in the concentrated seawater, concentrated seawater can produce calcium sulfate scaling in continuing evaporating concentration process (is called for short: the calcium dirt), cause evaporation unit normally to move.
Summary of the invention
The present invention is according to dissolubility data and the common-ion effcet principle of calcium sulfate in seawater; " converting halogen " method of employing was separated out the calcium sulfate that is dissolved in the concentrated seawater in a large number before advancing evaporating pot; Concentrated seawater has successfully been crossed the peak phase that calcium sulfate is separated out; Thereby produce the calcium dirt when having avoided concentrated seawater in evaporating pot, to continue evaporation concentration, realized the purpose of concentrated seawater batch production salt manufacturing, concentrated seawater promptly need not enter the sea and also not take a large amount of soils.
Technical scheme of the present invention is following:
A kind of concentrated seawater with the sea water desaltination by-product is that the device of halogen method of evaporation salt manufacturing is converted in the raw material employing, and static mixer H connects settling vessel C, and settling vessel connects vaporizer Z, and vaporizer connects whizzer L; Static mixer is provided with concentrated seawater inlet H1, bittern inlet H2, salt slurry inlet H4 and mixes halogen outlet H3; Settling vessel is provided with and mixes halogen inlet C1, mixing halogen outlet C2 and calcium sulfate outlet C3; Vaporizer is provided with secondary steam outlet Z1, salt slurry outlet Z2, vaporizer bittern outlet Z3, vaporizer mixing halogen inlet Z4, condensation-water drain Z5 and heating steam inlet Z6; Whizzer is provided with whizzer salt slurry inlet L1, salt outlet L2 and whizzer bittern outlet L3; Mixing halogen outlet H3 is connected with mixing halogen inlet C1 through pipeline; Mixing halogen outlet C2 is connected with mixing halogen inlet Z4 through pipeline; Salt slurry outlet Z2 is connected with the pipeline of salt slurry inlet H4 with whizzer salt slurry inlet L1 through pipeline; Mix halogen outlet C2 and be connected with mixing halogen inlet Z4 through pipeline, bittern inlet H2 is connected with the pipeline of whizzer bittern outlet L3 with vaporizer bittern outlet Z3 through pipeline.
Concentrated seawater with the sea water desaltination by-product is that raw material adopts the method for halogen method of evaporation salt manufacturing of converting; Get 5～12 ° of B é concentrated seawaters of 10 unit volumes and 28～29 ° of B é bitterns of 2.2～2.5 unit volumes and the salt slurry of 0.26～0.27 unit volume and put into static mixer H, the salt slurry is volume ratio; 45～50%, sodium-chlor and 50～55% bitterns; Under normal temperature, normal pressure, convert halogen and obtain mixing halogen through static mixer; Mix halogen through the settling vessel sedimentation, calcium sulfate forms solid phase and from mix halogen, separates out, and obtains the calcium sulfate product; The mixing halogen concentration of settling vessel is advanced the evaporating pot evaporation concentration when 23～25 ° of B é, solid sodium chloride can constantly be separated out from bittern in transpiring moisture; The salt of getting 0.26～0.27 unit volume of from evaporating pot, discharging is starched back the concentrated seawater of converting halogen operation and 10 unit volumes and is converted halogen, and all the other salt slurries obtain the sodium-chlor product after through whizzer H solid-liquid separation; , bittern concentration stops evaporation operation when reaching 28～29 ° of B é; The bittern of from the bittern that evaporating pot is discharged, getting 2.2～2.5 unit volumes is got back to the concentrated seawater of converting halogen operation and 10 units and is converted halogen, and all the other bitterns (comprising the bittern that whizzer H discharges) are discharged the raw material of evaporization process as Chemicals such as production Repone K.
So far, the concentrated seawater of discharging from desalinator is all utilized, and accomplishes zero release.
3.3; Advantage of the present invention
Biggest advantage of the present invention is: according to the common-ion effcet principle; Bittern (bittern) and the salt slurry of getting high density is got back to and is converted the halogen operation and participate in concentrated seawater and convert halogen; Separate out with solid phase form being dissolved in the concentrated seawater calcium sulfate dexterously; Overwhelming majority calcium sulfate separates with concentrated seawater, reaches concentrated seawater does not generate the calcium dirt when continuing evaporation concentration purpose.Successfully solved concentrated seawater generates the calcium dirt when continuing evaporation concentration a difficult problem, concentrated seawater can realize batch production salt manufacturing, avoided concentrated seawater to the pollution of ocean or take a large amount of soils and shine halogen.
Description of drawings
Fig. 1: apparatus of the present invention figure.
Explain:
H: static mixer Z
1: the secondary steam outlet
C: settling vessel Z
2: the outlet of salt slurry
Z: vaporizer Z
3: the outlet of vaporizer bittern
L: whizzer Z
4: vaporizer mixing halogen inlet
H
1: concentrated seawater inlet Z
5: condensation-water drain
H
2: bittern inlet Z
6: the heating steam inlet
H
3: mix halogen outlet L
1: whizzer salt slurry inlet
H
4: salt slurry inlet L
2: the salt outlet
C
1: mix halogen inlet L
3: the outlet of whizzer bittern
C
2: mix the halogen outlet
C
3: the calcium sulfate outlet
Embodiment
Key of the present invention is to adopt the method for converting halogen to solve concentrated seawater when continuing evaporation concentration, to generate the calcium dirt, guarantees that evaporation unit moves continuously.
Device of the present invention is as shown in Figure 1: static mixer H connects settling vessel C, and settling vessel connects vaporizer Z, and vaporizer connects whizzer L; Static mixer is provided with concentrated seawater inlet H1, bittern inlet H2, salt slurry inlet H4 and mixes halogen outlet H3; Settling vessel is provided with and mixes halogen inlet C1, mixing halogen outlet C2 and calcium sulfate outlet C3; Vaporizer is provided with secondary steam outlet Z1, salt slurry outlet Z2, vaporizer bittern outlet Z3, vaporizer mixing halogen inlet Z4, condensation-water drain Z5 and heating steam inlet Z6; Whizzer is provided with whizzer salt slurry inlet L1, salt outlet L2 and whizzer bittern outlet L3; Mixing halogen outlet H3 is connected with mixing halogen inlet C1 through pipeline; Mixing halogen outlet C2 is connected with mixing halogen inlet Z4 through pipeline; Salt slurry outlet Z2 is connected with the pipeline of salt slurry inlet H4 with whizzer salt slurry inlet L1 through pipeline; Mix halogen outlet C2 and be connected with mixing halogen inlet Z4 through pipeline, bittern inlet H2 is connected with the pipeline of whizzer bittern outlet L3 with vaporizer bittern outlet Z3 through pipeline.
Concentrated seawater with the sea water desaltination by-product is that raw material adopts the method for halogen method of evaporation salt manufacturing of converting; Get 5～12 ° of B é concentrated seawaters of 10 unit volumes and 28～29 ° of B é bitterns of 2.2～2.5 unit volumes and the salt slurry of 0.26～0.27 unit volume and put into static mixer H, the salt slurry is volume ratio; 45～50%, sodium-chlor and 50～55% bitterns; Under normal temperature, normal pressure, convert halogen and obtain mixing halogen through static mixer; Mix halogen through the settling vessel sedimentation, calcium sulfate forms solid phase and from mix halogen, separates out, and obtains the calcium sulfate product; The mixing halogen concentration of settling vessel is advanced the evaporating pot evaporation concentration when 23～25 ° of B é, solid sodium chloride can constantly be separated out from bittern in transpiring moisture; The salt of getting 0.26～0.27 unit volume of from evaporating pot, discharging is starched back the concentrated seawater of converting halogen operation and 10 unit volumes and is converted halogen, and all the other salt slurries obtain the sodium-chlor product after through whizzer H solid-liquid separation; , bittern concentration stops evaporation operation when reaching 28～29 ° of B é; The bittern of from the bittern that evaporating pot is discharged, getting 2.2～2.5 unit volumes is got back to the concentrated seawater of converting halogen operation and 10 units and is converted halogen, and all the other bitterns (comprising the bittern that whizzer H discharges) are discharged the raw material of evaporization process as Chemicals such as production Repone K.
Instance 1:
The first step is converted the halogen operation
Get 11～12 ° of B é concentrated seawaters ((salt slurry (volume ratio of sulfur acid calcium 0.30～0.35g/l) and 0.264 liter in this moment bittern of the bittern of sulfur acid calcium 4.03～4.06g/l) and 28～29 ° of B é of 2.4 liters in this moment concentrated seawater of 10 liters; 45～50%, sodium-chlor, 50～55%, bittern) under normal temperature, normal pressure, convert halogen.
Because common-ion effcet, the calcium sulfate in the concentrated seawater forms solid phase and from mix halogen, separates out, and through the settling vessel sedimentation, calcium sulfate separates with mixing halogen, isolates 21～23 gram calcium sulfate products.
Through converting mixing halogen concentration after the halogen about 23～25 ° of B é, the calcium sulphate content of this moment has dropped to the 1.40～1.45g/l that mixes halogen (23～25 ° of B é) from 4.03～4.06g/l of concentrated seawater (11～12 ° of B é).
After converting halogen, the halogen operation obtains the raw material of about 12.4～12.5 liters mixing halogen (concentration is at 23～25 ° of B é) through converting as evaporization process.
Second step, evaporization process
The concentration of converting after the halogen gets into the evaporization process evaporation concentration at the mixing halogen of 23～25 ° of B é, and bittern concentration stops evaporation when reaching 28～29 ° of B é.
The part (ratio see convert the halogen operation) that evaporization process is discharged bittern is returned and is converted the halogen operation and convert halogen, all the other bitterns (1.5～1.6 liters, sulfur acid calcium 0.30～0.36g/l) are as the raw material of producing product such as Repone K.
A part (ratio see convert the halogen operation) of discharging the salt slurry is returned and is converted that the halogen operation is converted halogen, all the other salt slurries obtain 800～810 gram sodium-chlor products through solid-liquid separation.
Instance 2
The first step is converted the halogen operation
Get 9～10B é concentrated seawater ((salt slurry (volume ratio of sulfur acid calcium 0.30～0.35g/l) and 0.264 liter in this moment bittern of the bittern of sulfur acid calcium 3.95～4.02g/l) and 28～29 ° of B é of 2.5 liters in this moment concentrated seawater of 10 liters; 45～50%, sodium-chlor, 50～55%, bittern) under normal temperature, normal pressure, convert halogen.
Because common-ion effcet, the calcium sulfate in the concentrated seawater forms solid phase and from mix halogen, separates out, and through the settling vessel sedimentation, calcium sulfate separates with mixing halogen, obtains 20～21 gram calcium sulfate products.
Through converting mixing halogen concentration after the halogen about 23～25 ° of B é, the calcium sulphate content of this moment has dropped to the 1.40～1.45g/l that mixes halogen (23～25 ° of B é) from 3.95～4.03g/l of concentrated seawater (9～10 ° of B é).
After converting halogen, the halogen operation obtains the raw material of about 12.4～12.5 liters mixing halogen (concentration is at 23～25 ° of B é) through converting as evaporization process.
Second step, evaporization process
The mixing halogen of concentration about 23～25 ° of B é of converting after the halogen gets into the evaporization process evaporation concentration, and bittern concentration stops evaporation when reaching 28～29 ° of B é.
The part (ratio see convert the halogen operation) that evaporization process is discharged bittern is returned and is converted the halogen operation and convert halogen, all the other bitterns (about 1.45～1.55 liters, sulfur acid calcium 0.30～0.35g/l) are as the raw material of producing product such as Repone K.
A part (ratio see convert the halogen operation) of discharging the salt slurry is returned and is converted that the halogen operation is converted halogen, all the other salt slurries obtain 795～805 gram sodium-chlor products through solid-liquid separation.
The invention solves concentrated seawater and when continuing evaporation concentration, generate the calcium dirt, guarantee that evaporation unit moves continuously.Described in the inventionly can not be interpreted as the restriction that the present invention is done, to belonging to mentality of designing of the present invention on the whole, and the conspicuous change of having done all should belong within the protection domain of the present invention.
Claims (2)
1. the concentrated seawater with the sea water desaltination by-product is that the device of halogen method of evaporation salt manufacturing is converted in the raw material employing, it is characterized in that static mixer H connects settling vessel C, and settling vessel connects vaporizer Z, and vaporizer connects whizzer L; Static mixer is provided with concentrated seawater inlet H1, bittern inlet H2, salt slurry inlet H4 and mixes halogen outlet H3; Settling vessel is provided with and mixes halogen inlet C1, mixing halogen outlet C2 and calcium sulfate outlet C3; Vaporizer is provided with secondary steam outlet Z1, salt slurry outlet Z2, vaporizer bittern outlet Z3, vaporizer mixing halogen inlet Z4, condensation-water drain Z5 and heating steam inlet Z6; Whizzer is provided with whizzer salt slurry inlet L1, salt outlet L2 and whizzer bittern outlet L3; Mixing halogen outlet H3 is connected with mixing halogen inlet C1 through pipeline; Mixing halogen outlet C2 is connected with mixing halogen inlet Z4 through pipeline; Salt slurry outlet Z2 is connected with the pipeline of salt slurry inlet H4 with whizzer salt slurry inlet L1 through pipeline; Mix halogen outlet C2 and be connected with mixing halogen inlet Z4 through pipeline, bittern inlet H2 is connected with the pipeline of whizzer bittern outlet L3 with vaporizer bittern outlet Z3 through pipeline.
2. the concentrated seawater with the sea water desaltination by-product is that raw material adopts the method for halogen method of evaporation salt manufacturing of converting; It is characterized in that getting 5～12 ° of B é concentrated seawaters of 10 unit volumes and 28～29 ° of B é bitterns of 2.2～2.5 unit volumes and the salt slurry of 0.26～0.27 unit volume and put into static mixer H, the salt slurry is volume ratio; 45～50%, sodium-chlor and 50～55% bitterns; Under normal temperature, normal pressure, convert halogen and obtain mixing halogen through static mixer; Mix halogen through the settling vessel sedimentation, calcium sulfate forms solid phase and from mix halogen, separates out, and obtains the calcium sulfate product; The mixing halogen concentration of settling vessel is advanced the evaporating pot evaporation concentration when 23～25 ° of B é, solid sodium chloride can constantly be separated out from bittern in transpiring moisture; The salt of getting 0.26～0.27 unit volume of from evaporating pot, discharging is starched back the concentrated seawater of converting halogen operation and 10 unit volumes and is converted halogen, and all the other salt slurries obtain the sodium-chlor product after through whizzer H solid-liquid separation; , bittern concentration stops evaporation operation when reaching 28～29 ° of B é; The bittern of from the bittern that evaporating pot is discharged, getting 2.2～2.5 unit volumes is got back to the concentrated seawater of converting halogen operation and 10 units and is converted halogen, and all the other bitterns are discharged the raw material of evaporization process as products such as production Repone K.
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| CN 201110411270 CN102515204B (en) | 2011-12-09 | 2011-12-09 | Device for producing salt by brine-mixing and evaporation method with concentrated seawater by-product of seawater desalination as raw material and method thereof |
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| CN 201110411270 CN102515204B (en) | 2011-12-09 | 2011-12-09 | Device for producing salt by brine-mixing and evaporation method with concentrated seawater by-product of seawater desalination as raw material and method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109534568A (en) * | 2017-09-22 | 2019-03-29 | 金達行有限公司 | Integrated seawater resources utilization system |
| CN111362284A (en) * | 2020-05-18 | 2020-07-03 | 天津君瑞和科技有限公司 | Method for preparing magnesium potassium sulfate from bittern obtained by preparing salt from seawater |
| CN111547745A (en) * | 2020-05-18 | 2020-08-18 | 天津君瑞和科技有限公司 | Method for removing sodium chloride from bittern produced by seawater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109534568A (en) * | 2017-09-22 | 2019-03-29 | 金達行有限公司 | Integrated seawater resources utilization system |
| CN111362284A (en) * | 2020-05-18 | 2020-07-03 | 天津君瑞和科技有限公司 | Method for preparing magnesium potassium sulfate from bittern obtained by preparing salt from seawater |
| CN111547745A (en) * | 2020-05-18 | 2020-08-18 | 天津君瑞和科技有限公司 | Method for removing sodium chloride from bittern produced by seawater |
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