CN101104532A - Technique for producing refined salt from salt production waste liquid - Google Patents
Technique for producing refined salt from salt production waste liquid Download PDFInfo
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- CN101104532A CN101104532A CNA2007100571953A CN200710057195A CN101104532A CN 101104532 A CN101104532 A CN 101104532A CN A2007100571953 A CNA2007100571953 A CN A2007100571953A CN 200710057195 A CN200710057195 A CN 200710057195A CN 101104532 A CN101104532 A CN 101104532A
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- 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
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- Y02A20/124—Water desalination
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Abstract
The present invention provides a refined salt preparation technology by using salt-making liquid waste. The technology comprises the following five steps: evaporation and concentration, mother liquor thickening, bitter salt recovery, washing and dehydration, as well as drying and packaging, and the refined salt will be finally sent to the salt storehouse. The effect of the invention is that the advanced vacuum salt-making technology and salt washing process are adopted in stead of alternative drying to produce high-quality industrial salt so as to improve the yield and quality of industrial salt. Meanwhile, the invention can also help improve the concentration of bittern that enters into the potassium-making work section to reduce the salinity and provide high-quality raw materials for the production of chemical plants; the application of the invention can save the alternative drying area, raise resource utilization rate, increase product yield and reduce the loss of chemical resources to provide a model road for comprehensive utilization of the seawater salt industry as well as the concentrated seawater salt-making after the desalination. The invention achieves organic combination between the new-type salt-making industry and the ocean chemical engineering and realizes zero-discharge of the salt-making waste liquid to make the brine resources be scientifically protected and rationally used. The invention can also protect the marine environment and gradually realize factory salt production.
Description
Technical field
The present invention relates to a kind of salt extraction process, particularly a kind of is the preparation technology of raw material production purified salt with the salt-manufacturing waste liquor.
Background technology
Mother liquor behind the preparing salt by working up seawater (salt-manufacturing waste liquor) concentration is about 27 ° of Be/, contains a large amount of salts, enters the sea and can cause environmental pollution, needs further to concentrate laggard chemical plant and extracts available resources.Normally through multiple the solarization concentration is brought up to about 30 ° of Be/, this technology shortcoming one is that multiple solarization back institute salt manufacturing quality is low; The 2nd, there is a large amount of seepage losseses, serious waste of resources; The 3rd, take a large amount of land resourcess.
Salt is the basic raw material that middle caustic soda of chemical industry " three sour two alkali " and soda ash are produced, and annual consumption is for producing 60% of salt amount.Along with the increase day by day of ion film caustic soda ratio, domestic salt industry market, presses for and produces high-quality Industrial Salt and satisfy the demand in market also with growing the demand of high-quality salt.Salt-manufacturing waste liquor being fully utilized, improve resource utilization, with salt-manufacturing waste liquor " eat do press clean ", is to demand the technical task developed at present urgently.
Summary of the invention
In order to address the above problem, the purpose of this invention is to provide a kind of is the preparation technology of raw material production purified salt with the salt-manufacturing waste liquor, adopt salt-manufacturing waste liquor directly to enter evaporating pot evaporation salt manufacturing and coproduction vitriolate of tartar, magnesium chloride, purified salt, bromine, concentrating waste liquid also, by-product goes out high-quality Industrial Salt, reduce the saltiness that enters system potassium workshop section bittern and improve its concentration, reduce the energy consumption of system potassium technology and improve potassium quality and output, and save and shine the soil again, prevented the seepage losses that multiple solarization brings, substitute multiple the solarization, reduce resources loss, make full use of the bittern resource, increase product production.
For achieving the above object, it is the preparation technology of raw material production purified salt with the salt-manufacturing waste liquor that the technical solution that the present invention adopts provides a kind of, and this technology may further comprise the steps:
Step 1: evaporation concentration, the salt-manufacturing waste liquor of raw materials for production after imitating exhaust steam preheater and the preheating of mixing condensation water plate-type heat exchanger, IV is imported the IV effect, after going out the preheating of IV effect feed liquid branch effect, advance I, II, III effect through the pump advection, each imitates the pressured poor following current of feed liquid changes material, and III imitate salt discharge simultaneously to desalinization of soil by flooding or leaching device, row's mother liquor to dense halogen jar; It is 120～140 ℃ that I is imitated feed temperature; It is 60～90 ℃ that III is imitated feed temperature, and dense halogen jar feed temperature is 40～60 ℃, and row's halogen concentration that control III is imitated is not higher than 31.5 ° of Be ', and control sal epsom is not separated out;
Step 2: the mother liquor thickening, above-mentioned III is imitated the mother liquor of discharging the dense halogen jar of importing continue evaporation, control dense halogen jar row halogen concentration and be not higher than 33 ° of Be ';
Step 3: sal amarum reclaims, and the sal amarum of discharging from dense halogen jar imports IV again and imitates reuse after salt dissolving tank is handled, and the concentrated halogen of discharge is delivered to the extraction that the chemical industry element is carried out in the chemical plant;
Step 4: washing dehydration, above-mentioned III is imitated salt discharge slurry liquid to desalinization of soil by flooding or leaching device wash with saturated halogen, after washing back salt slurry liquid imports the settling vessel thickening, enter centrifuge dewatering through swirler and form wet salt;
Step 5: dry packing, send into the salt storehouse after the wet salt drying device drying that the dehydration back forms.
Effect of the present invention is to adopt advanced vacuum salt production technology and desalinization of soil by flooding or leaching technology, substitutes multiple the solarization, produces the fine Industrial Salt, improves Industrial Salt output and quality.Improve the concentration that enters system potassium workshop section bittern, reduce its saltiness, provide the fine raw material for the chemical plant produces.Can save multiple solarization area, improve resource utilization, increase product production, reduce the loss of chemical resource, the road of a demonstration is provided for the concentrated seawater salt manufacturing after preparing salt by working up seawater comprehensive utilization and the sea water desaltination.Realize the combination of novel salt industry and marine chemical industry, realize " zero release " of salt-manufacturing waste liquor, make the bittern resource obtain science protection and utilization rationally, and protected ocean environment, progressively realize batch production salt manufacturing.
Description of drawings
Fig. 1 is a preparation technology's of the present invention schema.
Embodiment
Reach in conjunction with the accompanying drawings embodiment to of the present invention be that the preparation technology's of raw material production purified salt implementation procedure is illustrated with the salt-manufacturing waste liquor.
Of the present invention is that the preparation technology of raw material production purified salt adopts the sea salt salt-manufacturing waste liquor directly to enter evaporating pot evaporation salt manufacturing and coproduction vitriolate of tartar, magnesium chloride, purified salt, bromine Technology with the salt-manufacturing waste liquor, promptly be raw material, adopt the contrary circulation axis of external-heat to the dense halogen jar of discharging quadruple effect band vacuum evaporation technology with the salt-manufacturing waste liquor.(so-called " effects " is meant the efficient to steam utilization, and promptly the evaporation mode that only is utilized once of steam is called single-effect evaporation, does heating steam, the solution of this vaporizer of devaporation if the secondary steam that handle is evaporated from solution is delivered in another vaporizer.The steam of this moment has been utilized secondary, and this evaporation mode is called double-effect evaporation.That vaporizer that heating steam at first feeds is called I and imitates evaporation; Secondary steam feeds second vaporizer and is called the evaporation of II effect, and the rest may be inferred II, III effect occurs.) its technical process is: salt-manufacturing waste liquor enters IV and imitates after IV is imitated exhaust steam preheater and the preheating of mixing condensation water plate-type heat exchanger, go out IV imitate material divide imitate preheating after, through the pump advection advance I, II, III is imitated.Each imitates the pressured poor following current of salt slurry liquid changes feed liquid, and imitates salt discharge, row's mother liquor at III.Mother liquor enters dense halogen jar, continue to be concentrated into qualified after, deliver to chemical plant system potassium workshop, crude salt imports IV again and imitates reuse after salt dissolving tank is handled.The salt slurry liquid through two-stage desalinization of soil by flooding or leaching device (vertical desalinization of soil by flooding or leaching device and horizontal desalinization of soil by flooding or leaching device), after washing back salt slurry imports the settling vessel thickening, advances centrifuge dewatering through swirler with saturated halogen.Send into the salt storehouse after the wet salt drying after the dehydration.
This preparation technology may further comprise the steps:
Step 1: evaporation concentration, (it consists of: sodium-chlor 120～240g/L with the raw materials for production salt-manufacturing waste liquor; Repone K 12～28g/L; Sal epsom 20～120g/L; Magnesium chloride 30～150g/L) imports IV and imitates after IV is imitated exhaust steam preheater and the preheating of mixing condensation water plate-type heat exchanger, go out IV imitate feed liquid divide imitate preheating after, through the pump advection advance I, II, III is imitated.Each is imitated salt and starches pressured poor following current and change feed liquid, and imitates salt discharge, mother liquor at III.It is 120～140 ℃ that I is imitated feed temperature; It is 60～90 ℃ that III is imitated feed temperature; Dense halogen jar feed temperature is 40～60 ℃, and row's halogen concentration that control III is imitated is not higher than 31.5 ° of Be ', and assurance sal epsom is not separated out and is principle.
Step 2: the mother liquor thickening, III is imitated the mother liquor feed liquid of discharging the dense halogen jar of importing continue evaporation, control dense halogen jar row halogen concentration and be not higher than 33 ° of Be ', guarantee that the sal epsom amount of separating out is few, particle is thin, realizes flotation separation and Hui Rong.The salt amount and arrange halogen concentration to improve concentration ratio, to improve.
Step 3: sal amarum reclaims, and the sal amarum of discharging from dense halogen jar imports IV and imitates reuse after salt dissolving tank is handled, and the concentrated halogen of discharge is delivered to the extraction that the chemical industry element is carried out in the chemical plant.
Step 4: washing dehydration, III is imitated the salt slurry liquid of discharging wash through two-stage desalinization of soil by flooding or leaching device (vertical desalinization of soil by flooding or leaching device and horizontal desalinization of soil by flooding or leaching device) with saturated halogen, after washing back salt slurry imports the settling vessel thickening, enter centrifuge dewatering formation wet salt through swirler.
Step 5: dry packing, send into the salt storehouse after the wet salt drying device drying that dehydration forms.
It is the purified salt top grade standard of national standard " Industrial Salt " in (GB/T5462-2003) that this preparation technology produces technical indicator that purified salt reaches, and its quality standard is as follows respectively:
Industrial Salt
NaCl≥99.1％；
H
2O≤0.30％；
Water-insoluble≤0.05%;
Whiteness 80 degree;
Granularity: 0.25mm screenings 〉=80%,
≤ 0.1mm less than 2%.
Of the present invention is that the preparation technology of raw material production purified salt has realized vacuum salt production with the salt-manufacturing waste liquor, changes the seepage losses of multiple solarization bittern.This preparation technology is by controlling row's halogen concentration rationally, and row's halogen concentration that control III is imitated is not higher than 31.5 ° of Be ', and assurance sal epsom is not separated out and is principle, be not higher than 33 ° of Be ' in dense halogen jar control row halogen concentration, guarantee that the sal epsom amount of separating out is few, particle is thin, realizes flotation separation and Hui Rong.Improve concentration ratio as far as possible, can improve greatly the salt amount and arrange halogen concentration, improve separating effect, improve the economy that salt manufacturing economy and back segment extract.
This preparation technology has realized concentrating, analysing the combination of salt and chemical industry, and significantly the concentrating and analyse salt of its FEOL is for the energy-conservation of last part technology laid a good foundation.
Adopt advanced vacuum salt production technology and desalinization of soil by flooding or leaching technology, produce the fine Industrial Salt, improve Industrial Salt output and quality, improve the concentration that enters system potassium operation bittern, reduce its saltiness, provide the fine raw material for the downstream, chemical plant produces.This preparation technology has realized salt-manufacturing waste liquor " zero release ", makes the bittern resource obtain science protection and utilization rationally, and has protected ocean environment, progressively realizes batch production salt manufacturing.Preparation technology of the present invention already realizes recycling economy as an environmental protection and energy saving project to sea salt, forms an energy-conservation industrial chain, and is significant, for the recycling of mother liquor behind the preparing salt by working up seawater searches out an energy-efficient road.
The steam that produces advances I imitates heating chamber, and each is imitated the secondary steam that is produced and imitates thermal source as next successively.Dense halogen jar extracts III imitates secondary steam as thermal source, and tail vapour enters reverse-flow spray mixing condenser.I sends the boiler reuse back to after imitating twice of water of condensation shwoot, and II is imitated water of condensation and sent the boiler reuse through washing back to after qualified.III, IV are imitated water of condensation and are made the plate-type heat exchanger thermal source behind the shwoot step by step.Water of condensation after preheating is used enters the water of condensation storage tank and makes production, domestic water.
Evaporating pot heating chamber heating tube material I is imitated and is selected titanium alloy for use, and II, III, IV are imitated and dense halogen jar is selected pure titanium for use.Evaporator room and circulation tube adopt the 316L/Q235-B composition board.And select for use condensation effect preferably KTPL spray opposite flow condenser add secondary and steam spray and the spray of one-level water, the material of imitating feed liquid in the end is gentle to improve the vacuum tightness that feed liquid is imitated at the end to reduce, and increases the vapo(u)rization system effective temperature difference, raising system steam capability.Circulating water system adopts the WGPL no-padding and spraying cooling tower, with further reduction temperature of cooling water.Automatically advanced DCS Controlling System is reliably adopted in control.This Technology is reliable, index advanced person, good energy-conserving effect, good environmental protection, remarkable in economical benefits.
Claims (2)
1. one kind is the preparation technology of raw material production purified salt with the salt-manufacturing waste liquor, and this technology may further comprise the steps:
Step 1: evaporation concentration, the salt-manufacturing waste liquor of raw materials for production after imitating exhaust steam preheater and the preheating of mixing condensation water plate-type heat exchanger, IV is imported the IV effect, after going out the preheating of IV effect feed liquid branch effect, advance I, II, III effect through the pump advection, each imitates the pressured poor following current of feed liquid changes material, and III imitate salt discharge simultaneously to desalinization of soil by flooding or leaching device, row's mother liquor to dense halogen jar; It is 120～140 ℃ that I is imitated feed temperature; It is 60～90 ℃ that III is imitated feed temperature, and dense halogen jar feed temperature is 40～60 ℃, and row's halogen concentration that control III is imitated is not higher than 31.5 ° of Be ', and control sal epsom is not separated out;
Step 2: the mother liquor thickening, above-mentioned III is imitated the mother liquor of discharging the dense halogen jar of importing continue evaporation, control dense halogen jar row halogen concentration and be not higher than 33 ° of Be ';
Step 3: sal amarum reclaims, and the sal amarum of discharging from dense halogen jar imports IV again and imitates reuse after salt dissolving tank is handled, and the concentrated halogen of discharge is delivered to the extraction that the chemical industry element is carried out in the chemical plant;
Step 4: washing dehydration, above-mentioned III is imitated salt discharge slurry liquid to desalinization of soil by flooding or leaching device wash with saturated halogen, after washing back salt slurry liquid imports the settling vessel thickening, enter centrifuge dewatering through swirler and form wet salt;
Step 5: dry packing, send into the salt storehouse after the wet salt drying device drying that the dehydration back forms.
2. preparation technology according to claim 1 is characterized in that: described desalinization of soil by flooding or leaching device is vertical desalinization of soil by flooding or leaching device and horizontal desalinization of soil by flooding or leaching device two-stage desalinization of soil by flooding or leaching device.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102461860A (en) * | 2010-11-17 | 2012-05-23 | 天津长芦汉沽盐场有限责任公司 | Method for preparing edible salt from acrid bittern |
| CN102502713A (en) * | 2011-10-18 | 2012-06-20 | 江苏白玫化工有限公司 | Sodium sulphate preparation method and sodium sulphate foot structure of evaporator therefor |
| CN104370315A (en) * | 2014-11-14 | 2015-02-25 | 青岛双瑞海洋环境工程股份有限公司 | Novel low-temperature multi-effect seawater desalination evaporator |
| CN104755426A (en) * | 2012-09-12 | 2015-07-01 | 洲际钾肥公司(美国) | Methods of processing solutions of potassium sulfate and magnesium sulfate, methods of producing potassium sulfate, and related systems |
| CN105692558A (en) * | 2015-08-26 | 2016-06-22 | 天津长芦海晶集团有限公司 | Method for vaporizing liquid chlorine by using heat energy produced from sulfur combustion |
| CN108211389A (en) * | 2018-03-22 | 2018-06-29 | 兰州节能环保工程有限责任公司 | A kind of vaporising device and setting method with self-cleaning function |
| CN108584986A (en) * | 2018-05-15 | 2018-09-28 | 新疆盐湖制盐有限责任公司 | A kind of preparation process producing purified salt using salt-manufacturing waste liquor as raw material |
| CN109607569A (en) * | 2018-12-10 | 2019-04-12 | 中盐枣阳盐化有限公司 | A kind of three-level desalinization of soil by flooding or leaching method |
| CN109896536A (en) * | 2017-12-11 | 2019-06-18 | 江苏苏盐井神股份有限公司 | A kind of technique that powder salt turns brilliant production certified products product salt |
| CN109911917A (en) * | 2019-01-16 | 2019-06-21 | 江苏盛勤环境工程有限公司 | The dangerous waste of organic matter containing complicated ingredient consolidates the process of salt resource regeneration |
| CN113666392A (en) * | 2021-08-31 | 2021-11-19 | 中盐工程技术研究院有限公司 | Salt discharge system of counter-current salt washer and counter-current salt discharge control method |
| CN115770551A (en) * | 2022-12-12 | 2023-03-10 | 江苏苏盐井神股份有限公司 | Method for producing multifunctional dehumidifying agent and bamboo salt by using calcium chloride type brine |
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2007
- 2007-04-24 CN CNB2007100571953A patent/CN100484883C/en active Active
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102461860A (en) * | 2010-11-17 | 2012-05-23 | 天津长芦汉沽盐场有限责任公司 | Method for preparing edible salt from acrid bittern |
| CN102502713A (en) * | 2011-10-18 | 2012-06-20 | 江苏白玫化工有限公司 | Sodium sulphate preparation method and sodium sulphate foot structure of evaporator therefor |
| CN104755426A (en) * | 2012-09-12 | 2015-07-01 | 洲际钾肥公司(美国) | Methods of processing solutions of potassium sulfate and magnesium sulfate, methods of producing potassium sulfate, and related systems |
| CN104755426B (en) * | 2012-09-12 | 2017-05-31 | 洲际钾肥公司(美国) | Process method, the method for production potassium sulfate and the related system of sulphate of potash and magesium solution |
| CN104370315A (en) * | 2014-11-14 | 2015-02-25 | 青岛双瑞海洋环境工程股份有限公司 | Novel low-temperature multi-effect seawater desalination evaporator |
| CN105692558A (en) * | 2015-08-26 | 2016-06-22 | 天津长芦海晶集团有限公司 | Method for vaporizing liquid chlorine by using heat energy produced from sulfur combustion |
| CN109896536A (en) * | 2017-12-11 | 2019-06-18 | 江苏苏盐井神股份有限公司 | A kind of technique that powder salt turns brilliant production certified products product salt |
| CN109896536B (en) * | 2017-12-11 | 2021-09-07 | 江苏苏盐井神股份有限公司 | Process for producing quality salt product by powder salt crystal transformation |
| CN108211389A (en) * | 2018-03-22 | 2018-06-29 | 兰州节能环保工程有限责任公司 | A kind of vaporising device and setting method with self-cleaning function |
| CN108584986A (en) * | 2018-05-15 | 2018-09-28 | 新疆盐湖制盐有限责任公司 | A kind of preparation process producing purified salt using salt-manufacturing waste liquor as raw material |
| CN109607569A (en) * | 2018-12-10 | 2019-04-12 | 中盐枣阳盐化有限公司 | A kind of three-level desalinization of soil by flooding or leaching method |
| CN109911917A (en) * | 2019-01-16 | 2019-06-21 | 江苏盛勤环境工程有限公司 | The dangerous waste of organic matter containing complicated ingredient consolidates the process of salt resource regeneration |
| CN113666392A (en) * | 2021-08-31 | 2021-11-19 | 中盐工程技术研究院有限公司 | Salt discharge system of counter-current salt washer and counter-current salt discharge control method |
| CN115770551A (en) * | 2022-12-12 | 2023-03-10 | 江苏苏盐井神股份有限公司 | Method for producing multifunctional dehumidifying agent and bamboo salt by using calcium chloride type brine |
| CN115770551B (en) * | 2022-12-12 | 2024-02-23 | 江苏苏盐井神股份有限公司 | Method for producing multifunctional dehumidifier and bamboo salt by using calcium chloride type brine |
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