CN112845534A - Method for treating waste residue liquid of soda ash - Google Patents
Method for treating waste residue liquid of soda ash Download PDFInfo
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- CN112845534A CN112845534A CN202110113031.8A CN202110113031A CN112845534A CN 112845534 A CN112845534 A CN 112845534A CN 202110113031 A CN202110113031 A CN 202110113031A CN 112845534 A CN112845534 A CN 112845534A
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- soda
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- 239000007788 liquid Substances 0.000 title claims abstract description 110
- 239000002699 waste material Substances 0.000 title claims abstract description 109
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 38
- 235000017550 sodium carbonate Nutrition 0.000 title claims abstract description 30
- 229910000029 sodium carbonate Inorganic materials 0.000 title claims abstract description 30
- 238000004140 cleaning Methods 0.000 claims abstract description 87
- 150000003839 salts Chemical class 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000007787 solid Substances 0.000 claims abstract description 25
- 239000004576 sand Substances 0.000 claims abstract description 19
- 239000008235 industrial water Substances 0.000 claims abstract description 15
- 238000005406 washing Methods 0.000 claims abstract description 14
- 238000009826 distribution Methods 0.000 claims abstract description 9
- 239000004744 fabric Substances 0.000 claims abstract description 8
- 239000010413 mother solution Substances 0.000 claims abstract description 4
- 239000012267 brine Substances 0.000 claims description 31
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 31
- 238000004519 manufacturing process Methods 0.000 claims description 29
- 229910052736 halogen Inorganic materials 0.000 claims description 6
- 150000002367 halogens Chemical class 0.000 claims description 6
- 239000003513 alkali Substances 0.000 abstract description 43
- 235000002639 sodium chloride Nutrition 0.000 description 53
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- 239000012452 mother liquor Substances 0.000 description 16
- 239000000243 solution Substances 0.000 description 15
- 239000000463 material Substances 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 9
- 241000196324 Embryophyta Species 0.000 description 8
- 229910021529 ammonia Inorganic materials 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000002689 soil Substances 0.000 description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 6
- 240000006909 Tilia x europaea Species 0.000 description 6
- 235000011941 Tilia x europaea Nutrition 0.000 description 6
- 239000004571 lime Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 239000003518 caustics Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 208000028659 discharge Diseases 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000010802 sludge Substances 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000010446 mirabilite Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000006351 Leucophyllum frutescens Species 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 206010035148 Plague Diseases 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000009621 Solvay process Methods 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010908 plant waste Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/04—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for treating waste residue liquid of soda ash, which comprises the following steps: a. uniformly distributing ammonia-soda waste residue liquid on a vacuum belt filter through a distribution funnel, carrying out first-stage cleaning on the ammonia-soda waste residue liquid under the driving of filter cloth, wherein the first-stage cleaning water is salt-making condensate water of a salt making system, and collecting a cleaning mother solution after cleaning; b. after the ammonia-soda waste residue liquid in the step a is cleaned in the first stage, cleaning in a second stage and a third stage, wherein the cleaning water in the second stage and the cleaning water in the third stage are industrial water, and cleaning water is collected after cleaning; c. and washing the waste ammonia-soda residue liquid by three stages to obtain clean solid sand, wherein the solid sand can be used as sand for building engineering. The invention increases the mutual connection between the two systems by comprehensively utilizing the resources of the large saline-alkali system, and provides a new idea of waste discharge for the alkali industry in inland regions.
Description
Technical Field
The invention relates to the technical field of comprehensive utilization of waste residues in salt and alkali co-production, in particular to a method for treating waste residue liquid of soda.
Background
The method for preparing the sodium carbonate by the ammonia-soda process has the advantages of mature technology, short process route, cheap and easily available raw materials, high product quality and the like, so that the method becomes the most popular method for preparing the sodium carbonate in the alkali industry. However, the soda ash process requires discharge of a large amount of waste residue liquid (also called soda ash plant waste liquid, soda ash waste liquid). According to statistics, 11m of soda needs to be discharged every 1t of soda produced3The waste residue liquid. The discharge problem of the alkaline residue liquid is one of the major bottlenecks which plague the development of ammonia-soda plants. At present, most ammonia and soda plants at home and abroad are built by facing the sea, caustic sludge is filled in the sea to build land, a dam is built and stockpiled, and alkali liquor is discharged into the sea after being pretreated. The problem of waste residue liquid of the ammonia alkali plant greatly limits the regional distribution of the alkali plant, so that the transportation distance of products and raw materials is long, and the industrial layout distribution is unreasonable.
In the industrial production of salt, the salt is called as 'mother of industry', and the salt chemical industry using salt as a basic raw material mainly comprises two major industries of chlor-alkali and soda (commonly called as 'double alkali'). The production modes of industrial salt are roughly divided into three types, namely sea salt, lake salt and well and mineral salt. And the salt mine mainly comprising the sodium sulfate type (namely the mirabilite type salt mine) almost occupies the half-wall Jiangshan of well mineral salt. The production process of salt and nitrate co-production is almost adopted by mirabilite type salt mine production enterprises, brine is comprehensively utilized, and the maximum utilization of resources is expected to be obtained. Nowadays, salt chemical industry workers have explored a salt and alkali co-production process in order to obtain a better circular economy industry and make greater use of industrial resources. The low-nitrate brine provided by a salt making system can be directly used for producing soda ash, and the waste residue liquid discharged by the soda ash is supplied to the salt making system for brine extraction. The process mode of the saline-alkali co-production not only can relieve the environmental protection pressure of the ammonia-alkali plant in the inland, but also can realize the reutilization of resources, thereby realizing environment-friendly enterprises.
The combined production mode of salt and alkali is a large circulation system with mutual complementation, interdependence and mutual influence formed by salt and alkali production systems. The production mode has the greatest advantages that the limited resources of the two systems can be fully excavated and integrated, and the production cost is reduced. The method has the disadvantages that the mutual influence between the two systems can cause impure production of the two systems, and the special problem of salt-alkali co-production is derived.
In China, the caustic sludge is generally directly stacked, so that the soil is alkalized, and a large amount of land resources are occupied. There are many alkali-making enterprises or sending the waste ammonia-alkali slag liquid to salt-making system mine to inject into the waste brine well. Therefore, the solid waste in the waste residue liquid naturally settles in the waste dissolving cavity, so that a large amount of solid waste is filled in the halogen well. Therefore, the alkaline residue waste can be properly treated, and the problem of cavity collapse can be prevented. However, the conveying pump is abraded greatly by the quartz sand with higher hardness as larger solid particles in the waste slag liquid. This wear has already seriously affected normal production and is costly. Therefore, new methods for treating the waste residue liquid are urgently sought.
The composition of the ammonia-soda waste residue liquid varies with manufacturers, time, raw materials and operation conditions, and the composition of the solid waste content of the waste residue liquid of the alkali plant in a certain place is shown in table 1.
TABLE 1 composition of soda ash and ammonia-soda residue composition (unit:%)
As can be seen from other documents and table 1, the main components of the alkaline residue are calcium carbonate, calcium hydroxide and calcium sulfate, which can be used as the components of the soil framework, and the calcium carbonate itself can produce cementation between soil particles, so the alkaline residue itself can be the engineering soil. After the alkaline residue and materials such as fly ash or cement are mixed and compacted according to a certain proportion, the physical and mechanical properties of the alkaline residue are higher than those of common plain soil. The alkaline residue soil can be used as backfill of low-lying lands and underground tunnels and as a house foundation or road bed material, and the performance of the alkaline residue soil meets the requirement of the bearing capacity of the foundation. It is also shown by research that when the waste caustic sludge is used as road material, the lime-caustic sludge is compacted, fixed and converted, and the chloride ion elution amount is about 1.3% -1.4%, and the lime has obvious activation effect on the caustic sludge, and can improve the road surface strength. Therefore, the alkaline residue component contains NaCl and has a composition similar to that of the construction soil, and only Cl in the alkaline residue component needs to be removed-Or other impurity components, to obtain a roadbed material suitable for road construction, an auxiliary material for cement production or a backfill for a building construction site.
In conclusion, the treatment problem of the waste residue liquid from alkali production still troubles various ammonia alkali enterprises, and how to properly solve the waste residue liquid from alkali production or make the waste residue liquid become available resources is still a significant thing.
Disclosure of Invention
The invention aims to provide a method for treating waste residue liquid of soda, which aims at the special problems of salt and soda coproduction, comprehensively utilizes two large system resources of salt production and soda, further integrates the resources of the large system of salt and soda, realizes the proper treatment of the waste residue liquid of soda, can change waste into valuable, and reduces the production energy consumption.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for treating waste residue liquid of soda comprises the following steps:
a. uniformly distributing ammonia-soda waste residue liquid on a vacuum belt filter through a distribution funnel, carrying out first-stage cleaning on the ammonia-soda waste residue liquid under the driving of filter cloth, wherein the first-stage cleaning water is salt-making condensate water from a salt-making system, and collecting a cleaning mother solution after cleaning;
b. after the ammonia-soda waste residue liquid is washed in the first stage, washing in a second stage and a third stage is carried out, wherein the washing water in the second stage and the washing water in the third stage are industrial water, and washing liquid is collected after washing;
c. and washing the waste ammonia-soda residue liquid by three stages to obtain clean solid sand, wherein the solid sand can be used as sand for building engineering.
The ammonia-soda waste residue liquid in the invention is from a soda ash system, is waste produced by soda ash and contains about 3% of solid. The salt-making condensed water in the invention comes from a salt-making system and contains a small amount of Cl-And cannot be directly discharged. The cleaning mother liquor in the step a contains a large amount of Cl-And cleaning liquid of other impurity ions can not be directly discharged.
According to the invention, aiming at the special problems in the salt and alkali co-production, the salt making condensate water in the salt making system is used as the cleaning water in the first stage to clean the waste ammonia-alkali waste residue liquid generated by the soda system in the first stage, the cleaning mother liquor obtained after cleaning can return to the salt making system for injecting well to extract brine, and the extracted brine can return to the salt making system for making salt or can be directly used in the alkali making system. Industrial water is used as the second-stage and third-stage cleaning water to carry out second-stage and third-stage cleaning on the ammonia-soda waste residue liquid, and the cleaning liquid obtained after cleaning can be directly sent to a soda lime plant for lime melting or returned to a salt making system together with mother liquid for well injection and halogen extraction. After three stages of washing, Cl is obtained-The solid sand with low content meets the requirement of the sand for construction engineering and can be used as the sand for construction engineering. The method for treating the waste residue liquid of the calcined soda can utilize the resources of a large system for the salt and alkali co-production, treat the waste residue liquid of the ammonia and alkali in a grading and grading manner, change waste into valuable and further exert the circular economic advantages of the salt and alkali co-production.
Furthermore, the dosage ratio of the ammonia-soda waste residue liquid to the salt-making condensed water is 1.8-2.5 tons/cubic meter.
Further, the using amount ratio of the ammonia-soda waste residue liquid to the industrial water is 1.2-3.1 tons/cubic meter.
Further, Cl in the brine condensate in the step a-The content is 0-2500 mg/L, and Cl in the mother liquor-The content of Cl in the cleaning liquid in the step b is 0-75 g/L-The content is 0 to 11 g/L.
Further, Cl in the brine condensate in the step a-The content is 30-850 mg/L, and Cl in the mother liquor-The content of Cl in the cleaning liquid in the step b is 0-55 g/L-The content is 0 to 4.5 g/L.
Further, Cl in the brine condensate in the step a-The content is 45-550 mg/L, and Cl in the mother liquor-The content of Cl in the cleaning liquid in the step b is 0-55 g/L-The content is 0-2 g/L.
Further, the ammonia-soda waste residue liquid in the step a comes from a water vapor plant of a soda ash system, and the vacuum belt filter is a DI13/1300 type vacuum belt filter.
Further, the speed of the ammonia-soda waste residue liquid entering the vacuum belt filter in the step a is 3-6.2 t/h.
Further, the mother liquor in the step a is used for injecting well and producing halogen. The mother liquor of the invention removes quartz with a diameter of more than 0.5mm or solid with larger particles, thereby greatly reducing the abrasion of waste slag to the split pump and greatly prolonging the service life of the split pump.
The brine is injected into the brine well to dissolve rock salt, and the qualified brine can be used for salt production or directly used for an alkali production system.
Further, the cleaning solution in the step b is used for dissolving ash or is used for injecting well and producing halogen together with the mother solution. When Cl is in the cleaning solution-When the content is low, the cleaning agent is suitable for dissolving ash, and Cl is contained in the cleaning solution-When the content is higher, the method is suitable for being used together with the mother liquor for well injection and brine extraction.
The filter cloth on the vacuum belt filter can be cleaned by salt making condensed water to obtain filtrate which can be sent to lime melting. Further improving the recycling.
Compared with the prior art, the method for treating the waste residue liquid of the calcined soda has the following beneficial effects that:
the invention comprehensively utilizes the resources of the large saline-alkali system, increases the mutual connection between the two systems, and provides a new idea of waste discharge treatment for the alkali industry in inland regions.
The invention utilizes the wastes of salt and alkali production to carry out grading treatment and reasonable arrangement. The invention properly processes the waste residue liquid of ammonia-soda, not only solves the discharge problem of the waste residue liquid of ammonia-soda, but also obtains the materials which can be used for building, changes waste into valuable and exerts the circular economic advantage of the salt-alkali co-production.
And thirdly, quartz or solid with larger particles with the size of more than 0.5mm is removed from the mother liquor used for well injection in the treatment method, so that the abrasion of waste residues to the split pump can be greatly reduced, and the service life of the split pump can be greatly prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a process flow diagram for treating and recycling ammonia-soda waste residue liquid in the embodiment of the present invention;
FIG. 2 is a schematic diagram of a process for treating and recycling ammonia-soda waste residue liquid in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for treating waste residue liquid of soda comprises the following steps:
a. 25t of ammonia-soda waste residue liquid from a soda ash system is uniformly distributed on a vacuum belt filter through a distribution funnel, the speed of the ammonia-soda waste residue liquid entering the vacuum belt filter is 5t/h, the ammonia-soda waste residue liquid is cleaned in a first stage under the driving of filter cloth, cleaning water in the first stage is salt making condensate water from a salt making system, and the using amount of the salt making condensate water is 10m3H, Cl in the brine condensate-The content is 45mg/L, and cleaning mother liquor is collected after cleaning, wherein Cl in the mother liquor-The content is 55g/L, the mother liquor salt preparation system is used for injecting well and extracting brine, and the extracted brine can be sent to a salt preparation system to be used for preparing salt or directly used in an alkali preparation system;
b. after the ammonia alkali waste residue liquid in the step a is cleaned in the first stage, cleaning in the second stage and the third stage is carried out, the cleaning water in the second stage and the cleaning water in the third stage are all industrial water, and the water inflow of the industrial water for cleaning in the second stage and the third stage is 14m respectively3/h、12m3And h, collecting the obtained cleaning solution after cleaning, wherein Cl is contained in the obtained cleaning solution-The content is 2g/L, and the cleaning solution can be directly sent to a soda lime workshop for lime melting;
c. the ammonia-soda waste residue liquid can be cleaned in three stages to obtain cleaned solid sand, and Cl in the solid sand-The content is 0.65%, and the material can be used as backfill of underground tunnels or road bed materials.
Example 2
A method for treating waste residue liquid of soda comprises the following steps:
a. uniformly distributing 18t of ammonia-soda waste residue liquid from a soda ash system on a vacuum belt filter through a distribution funnel, wherein the speed of the ammonia-soda waste residue liquid entering the vacuum belt filter is 3t/h, the ammonia-soda waste residue liquid is cleaned in a first stage under the driving of filter cloth, the cleaning water in the first stage is salt-making condensed water from a salt-making system, and the using amount of the salt-making condensed water is 10m3H, Cl in the brine condensate-The content is 2500mg/L, cleaning mother liquor is collected after cleaning, and Cl in the mother liquor-The content is 65g/L, the mother liquor salt-making system is used for injecting well and extracting brine, and the extracted brine can be removedThe salt making system is used for making salt or directly used for an alkali making system;
b. after the ammonia alkali waste residue liquid in the step a is cleaned in the first stage, cleaning in the second stage and the third stage is carried out, the cleaning water in the second stage and the cleaning water in the third stage are all industrial water, and the water inflow of the industrial water for cleaning in the second stage and the third stage is 14m respectively3/h、13m3And h, collecting the obtained cleaning solution after cleaning, wherein Cl is contained in the obtained cleaning solution-The content is 4.5g/L, and the cleaning solution can be directly sent to a soda lime workshop for lime melting;
c. the ammonia-soda waste residue liquid can be cleaned in three stages to obtain cleaned solid sand, and Cl in the solid sand-The content is 0.73%, and the coating can be used for building paving.
Example 3
A method for treating waste residue liquid of soda comprises the following steps:
a. uniformly distributing 20t of ammonia-soda waste residue liquid from a soda ash system on a vacuum belt filter through a distribution funnel, wherein the speed of the ammonia-soda waste residue liquid entering the vacuum belt filter is 6.2t/h, the ammonia-soda waste residue liquid is cleaned in a first stage under the driving of filter cloth, the cleaning water in the first stage is salt-making condensed water from a salt-making system, and the using amount of the salt-making condensed water is 10m3H, Cl in the brine condensate-The content is 850mg/L, cleaning mother liquor is collected after cleaning, and Cl in the mother liquor-The content is 75g/L, the mother liquor salt preparation system is used for injecting well and extracting brine, and the extracted brine can be sent to a salt preparation system to be used for preparing salt or directly used in an alkali preparation system;
b. after the ammonia alkali waste residue liquid in the step a is cleaned in the first stage, cleaning in the second stage and the third stage is carried out, the cleaning water in the second stage and the cleaning water in the third stage are all industrial water, and the water inflow of the industrial water for cleaning in the second stage and the third stage is 12m respectively3/h、15m3And h, collecting the obtained cleaning solution after cleaning, wherein Cl is contained in the obtained cleaning solution-The content is 6.5g/L, and the cleaning solution can be directly sent to a soda lime workshop for lime melting;
c. the ammonia-soda waste residue liquid can be cleaned in three stages to obtain cleaned solid sand, and Cl in the solid sand-The content is 0.83%, and the product can be used as auxiliary material or building material for cement productionBuilding backfill of a construction site.
Example 4
A method for treating waste residue liquid of soda comprises the following steps:
a. the 24t of ammonia-soda waste residue liquid from a soda ash system is uniformly distributed on a vacuum belt filter through a distribution funnel, the speed of the ammonia-soda waste residue liquid entering the vacuum belt filter is 4.5t/h, the ammonia-soda waste residue liquid is cleaned in a first stage under the driving of filter cloth, the cleaning water in the first stage is salt-making condensate water from a salt-making system, and the using amount of the salt-making condensate water is 12m3H, Cl in the brine condensate-The content is 550mg/L, cleaning mother liquor is collected after cleaning, and Cl in the mother liquor-The content is 46g/L, the mother liquor salt preparation system is used for injecting well and extracting brine, and the extracted brine can be sent to a salt preparation system to be used for preparing salt or directly used in an alkali preparation system;
b. after the ammonia alkali waste residue liquid in the step a is cleaned in the first stage, cleaning in the second stage and the third stage is carried out, the cleaning water in the second stage and the cleaning water in the third stage are all industrial water, and the water inflow of the industrial water for cleaning in the second stage and the third stage is 11m respectively3/h、13m3And h, collecting the obtained cleaning solution after cleaning, wherein Cl is contained in the obtained cleaning solution-The content of Cl in the cleaning solution is 11g/L-The concentration is high, and the brine can be returned to the mother liquor pool and enters a brine production workshop together with the mother liquor for brine production;
c. the ammonia-soda waste residue liquid can be cleaned in three stages to obtain cleaned solid sand, and Cl in the solid sand-The content is 0.93%, and the product can be used for paving buildings or used as backfill for low-lying and underground tunnels.
Comparative example 1
The difference from the example 1 is that the comparative example 1 only carries out the first stage cleaning on the ammonia-soda waste residue liquid, the second stage cleaning and the third stage cleaning are omitted, the ammonia-soda waste residue liquid can be cleaned to obtain the solid sand, and Cl in the solid sand-The content was 7.2%.
Comparative example 2
The difference from the example 1 is that the comparative example 1 only carries out the second stage and the third stage cleaning on the ammonia-soda waste residue liquid, the cleaning of the first stage is omitted, and the ammonia-soda waste residue liquid can be cleanedObtaining clean solid sand, Cl in the solid sand-The content was 8.4%.
Comparative example 3
The difference from the example 1 is that the cleaning water in the first stage in the comparative example 1 is industrial water, and the ammonia-soda waste residue liquid can be cleaned to obtain cleaned solid sand, wherein Cl in the solid sand-The content was 4.8%.
The following compares examples 1-4 with comparative examples 1-3, and the results are shown in Table 2:
TABLE 2
As can be seen from the comparison between examples 1-4 and comparative examples 1-3, the cleaning in the first stage or the second and third stages is omitted, the connection between the salt making system and the alkali making system is destroyed, the circulation of the large salt and alkali making system is destroyed, and the harmless discharge of the ammonia-alkali waste residue liquid and the waste recycling of the ammonia-alkali waste residue liquid cannot be realized.
The invention also relates to a more detailed description of the treatment method of the invention with reference to fig. 1 and fig. 2, wherein fig. 1 is a process flow chart for treating and reusing the ammonia-soda waste residue liquid, and fig. 2 is a process schematic diagram for treating and reusing the ammonia-soda waste residue liquid.
The features of the embodiments and embodiments described above may be combined with each other without conflict.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The method for treating the waste residue liquid of the calcined soda is characterized by comprising the following steps of:
a. uniformly distributing ammonia-soda waste residue liquid on a vacuum belt filter through a distribution funnel, carrying out first-stage cleaning on the ammonia-soda waste residue liquid under the driving of filter cloth, wherein the first-stage cleaning water is salt-making condensate water of a salt making system, and collecting a cleaning mother solution after cleaning;
b. after the ammonia-soda waste residue liquid is washed in the first stage, washing in a second stage and a third stage is carried out, wherein the washing water in the second stage and the washing water in the third stage are industrial water, and washing liquid is collected after washing;
c. and washing the waste ammonia-soda residue liquid by three stages to obtain clean solid sand, wherein the solid sand can be used as sand for building engineering.
2. The method for treating the waste residue liquid of soda ash as claimed in claim 1, wherein the usage ratio of the waste residue liquid of soda ash to the condensed water for salt production is 1.8-2.5 tons/cubic meter.
3. The method for treating the waste residue liquid of soda ash as claimed in claim 1, wherein the using amount ratio of the waste residue liquid of soda ash to the industrial water is 1.2-3.1 ton/cubic meter.
4. The method for treating the waste residue liquid of the sodium carbonate according to claim 1, wherein Cl in the brine condensate water in the step a is added-The content is 0-2500 mg/L, and Cl in the mother liquor-The content of Cl in the cleaning liquid in the step b is 0-75 g/L-The content is 0 to 11 g/L.
5. The method for treating the waste residue liquid of the soda ash as claimed in claim 4, wherein Cl in the brine condensate in step a-The content is 30-850 mg/L, and Cl in the mother liquor-The content of Cl in the cleaning liquid in the step b is 0-55 g/L-The content is 0 to 4.5 g/L.
6.The method for treating the waste residue liquid of the soda ash as claimed in claim 5, wherein Cl in the brine condensate in step a-The content is 45-550 mg/L, and Cl in the mother liquor-The content of Cl in the cleaning liquid in the step b is 0-55 g/L-The content is 0-2 g/L.
7. The method for treating the waste residue liquid of the soda ash as claimed in claim 1, wherein the ammonia-soda residue liquid in step a is from a steam plant of a soda ash system, and the vacuum belt filter is a vacuum belt filter of DI13/1300 type.
8. The method for treating the waste residue liquid of soda ash as claimed in claim 1, wherein the speed of the waste residue liquid of soda ash entering the vacuum belt filter in step a is 3-6.2 t/h.
9. The method for treating the waste soda residue liquid as claimed in claim 1, wherein the mother liquid in step a is used for injecting well and extracting halogen.
10. The method for treating the soda ash waste residue liquid as claimed in claim 1, wherein the cleaning liquid in step b is used for dissolving ash or used for injecting well and extracting halogen together with mother liquid.
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