CN113893661A - CO2Process for reducing hardness of fly ash water washing liquid by coupling with alkali metal hydroxide - Google Patents
CO2Process for reducing hardness of fly ash water washing liquid by coupling with alkali metal hydroxide Download PDFInfo
- Publication number
- CN113893661A CN113893661A CN202111253789.8A CN202111253789A CN113893661A CN 113893661 A CN113893661 A CN 113893661A CN 202111253789 A CN202111253789 A CN 202111253789A CN 113893661 A CN113893661 A CN 113893661A
- Authority
- CN
- China
- Prior art keywords
- fly ash
- water washing
- solution
- hardness
- washing liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010881 fly ash Substances 0.000 title claims abstract description 56
- 238000005406 washing Methods 0.000 title claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000007788 liquid Substances 0.000 title claims abstract description 39
- 150000008044 alkali metal hydroxides Chemical class 0.000 title claims abstract description 22
- 230000008878 coupling Effects 0.000 title claims abstract description 15
- 238000010168 coupling process Methods 0.000 title claims abstract description 15
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 76
- 238000000034 method Methods 0.000 claims abstract description 35
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 21
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 18
- 239000003546 flue gas Substances 0.000 claims abstract description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000010521 absorption reaction Methods 0.000 claims description 13
- 238000005273 aeration Methods 0.000 claims description 9
- 239000007791 liquid phase Substances 0.000 claims description 9
- 238000002425 crystallisation Methods 0.000 claims description 7
- 230000008025 crystallization Effects 0.000 claims description 7
- 238000004821 distillation Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 7
- 238000000746 purification Methods 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 5
- 238000005201 scrubbing Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract description 4
- 239000002244 precipitate Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 55
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 5
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 238000003926 complexometric titration Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 3
- 239000002920 hazardous waste Substances 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 238000004537 pulping Methods 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 159000000000 sodium salts Chemical class 0.000 description 2
- 238000004056 waste incineration Methods 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- NOTVAPJNGZMVSD-UHFFFAOYSA-N potassium monoxide Inorganic materials [K]O[K] NOTVAPJNGZMVSD-UHFFFAOYSA-N 0.000 description 1
- 159000000001 potassium salts Chemical class 0.000 description 1
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
Abstract
The invention discloses CO2The invention relates to a process for reducing the hardness of fly ash water washing liquid by coupling with alkali metal hydroxide, which directly introduces CO purified by kiln tail flue gas into the fly ash water washing liquid2In order to maintain a certain PH value in the water washing liquid, simultaneously (or sequentially) adding alkali metal hydroxide, wherein the concentration of carbonate in the solution is greatly increased, so that a large amount of calcium ions are precipitated as calcium carbonate precipitates, and the aim of fully reducing the hardness of the water washing liquid is fulfilled; adopts a mode of adding NaOH to replace Na2CO3And the treatment cost of the fly ash washing liquid is reduced.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to CO2A process for reducing the hardness of aqueous fly ash liquors by coupling with alkali metal hydroxides.
Background
The fly ash generated after incineration treatment of garbage or other wastes contains oxides such as CaO, SiO2, Al2O3, Na2O, K2O and the like, and also contains heavy metals such as Pb, Cd, Zn, Cu, Cr and the like and substances such as dioxin and the like, and belongs to hazardous wastes according to the national hazardous waste record (2016 edition), the fly ash needs to be washed by multi-stage water to remove chlorine, and then high-temperature melting solidification of heavy metals is carried out, wherein the solution of the fly ash washing has the characteristics of high PH value, high chlorine, high calcium, potassium, sodium double salt, high heavy metal concentration and the like, and if the fly ash is directly discharged, the environment is seriously polluted, and the metal salt is also seriously wasted; at present, the distillation crystallization process is mainly adopted in industry, a large amount of sodium and potassium salts in fly ash solution are crystallized in the form of sodium chloride and potassium chloride and then sold in the form of products, and a large amount of water vapor generated in the evaporation process can enter a water washing circulation system again, so that zero emission is realized.
The process equipment for distillation crystallization requires that the hardness value of the treated liquid is below 200mg/L (calculated by CaO), in addition, a large amount of calcium ions are separated from the liquid phase, and the purity of the obtained sodium chloride and potassium chloride can also be higher, and the current industrially used mode is to add a large amount of Na into the solution2 CO3Adding Na2 CO3The method mainly aims to lead calcium ions and carbonate in the solution to form calcium carbonate precipitate, separate the calcium ions from the solution, bring a large amount of sodium ions into the solution while precipitating the calcium ions, and finally form sodium chloride salt through distillation and crystallization, and a process for separating and recycling metal sodium salt and potassium salt is disclosed in the patent of 'a method for producing potassium salt and sodium salt by utilizing waste incineration fly ash'; in patent application No. 202110729028.9 entitled fly ash washing System and washing method, a fly ash washing system is disclosed, which explains the washing process steps, equipment structure and principle in each step in detail, and in patent application No. 202110572606.2 entitled novel System and method for pulping, washing and carbon neutralization coupling of fly ash from waste incineration, the system comprises CO2A trapping device, a multiphase mixed pulping water washing unit and a solid-liquid separation unit, wherein the CO is2The collecting device comprises an adsorption furnace and a high-temperature roasting furnace, the multiphase mixed pulping and water washing unit comprises a carbonation reaction kettle, a fly ash storage tank, a three-way pipeline and a water washing reaction tank, and the carbonation reaction kettleComprises a kettle body, a windmill-shaped one-way pipeline, a vertical flute-shaped pipeline and a surrounding microporous pipeline, wherein CO is introduced into the kettle body2The invention firstly prepares the carbonic acid solution in the low-temperature pressurizing environment, can quickly generate a large amount of carbonate ions for reaction, and can obviously improve the efficiency of washing fly ash and CO2The utilization ratio of (2).
CO is also mentioned in the above patent2Especially patent (patent application No. 202110572606.2) proposes to use CO2Pressurizing the water for dissolving and washing fly ash, and the mode is also to increase CO as much as possible2To generate more carbonate ions in the solution, thereby maximizing the precipitation of calcium ions in the solution to reduce hardness, but in actual operation, due to CO2The lower water solubility, which greatly lowers the pH upon dissolution into a liquid, has the following effects: 1) will inhibit CO2The CO is significantly limited by continued dissolution of2The amount of dissolution of (a), limits the concentration of carbonate in the solution; 2) the reduction of the pH value can cause the precipitated calcium carbonate to be dissolved again, which can cause the concentration of calcium ions in the solution to be gradually increased, and is not beneficial to continuously reducing the hardness value in the liquid2CO can be obtained by coupling with alkali metal hydroxide such as NaOH2The process method can completely replace a large amount of sodium carbonate to further reduce the treatment cost of the fly ash water washing liquid.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides CO2A process for reducing the hardness of aqueous fly ash liquors by coupling with alkali metal hydroxides.
In order to achieve the purpose, the invention adopts the following technical scheme:
CO2the process for reducing the hardness of the fly ash water washing liquid by coupling with alkali metal hydroxide comprises the following specific steps:
S1、CO2extracting;
S2、CO2introducing fly ash washing solution;
s3, adding NaOH;
s4, introducing CO2And adding NaOH for cyclic treatment.
Preferably, the step S1 specifically includes: kiln tail flue gas CO2Including all carbon capture technologies, e.g. pressure swing adsorption purification of CO2Condensing, liquefying and purifying CO2Liquid phase absorption and purification of CO2Processes, membrane separation techniques, and the like.
Preferably, the step S2 specifically includes: CO purified from flue gas in step S12Introducing into water scrubbing solution of fly ash by CO aeration2Aerating in the fly ash washing liquid through an aeration head to achieve the effect of absorption; the spraying absorption mode is that the gas is filled with CO with a certain concentration2Spraying water washing solution of fly ash, water washing solution and CO in an atmosphere container2The contact achieves the absorption effect.
Preferably, the step S3 specifically includes: step S2 introducing CO2Then, the pH value of the solution is reduced while carbonate is generated, and at the moment, the pH value of the solution is properly increased by adding the alkali metal hydroxide NaOH, so that more CO can be dissolved2More carbonate can be generated in the solution, a large amount of calcium ions in the fly ash water washing liquid can be precipitated at the moment, and the concentration of the calcium ions can be reduced to meet the use requirement of a subsequent distillation crystallization system.
Preferably, the step S4 specifically includes: after a certain amount of NaOH is added in the step S3, the hardness of the liquid phase is not less than 200, at the moment, the NaOH needs to be added again, and the CO is introduced again2The hardness of the solution is further reduced until it is less than 200mg/L (calculated as CaO content in the solution).
Preferably, the CO collected and purified in the step S12The concentration is 5-100%.
The invention has the beneficial effects that:
1. the invention relates to CO extracted by kiln tail flue gas2Introduction of CO into2Purifying the concentration from 8% of the original concentration to a certain concentrationSince the fly ash solution is alkaline to some extent, part of CO can be dissolved2And form carbonate, the carbonate formed can precipitate a part of calcium ions; but with CO2In order to counteract the reduction in pH, a certain amount of NaOH, which is an alkali metal hydroxide, is added to the solution, the pH of the solution is increased to a great extent after the NaOH is added, and CO is introduced at this time2And carbonate with a certain concentration is further generated, according to the method, the concentration of the carbonate in the solution is continuously increased, more calcium carbonate is precipitated by the increased concentration of the carbonate, the concentration of calcium ions in the solution is reduced until the use requirement of a subsequent distillation crystallization system is met, and the process not only fully utilizes and solidifies CO2And the pH value is adjusted by using NaOH to completely replace Na2 CO3Greatly reduces the cost of hardness adjustment in the fly ash water washing liquid.
2. For the environment, the process realizes carbon capture and carbon neutralization; for economy, the process saves cost, reduces the operation energy consumption of fly ash treatment and realizes a route of green circular ecological production.
Drawings
FIG. 1 is a schematic view of the process of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments.
CO2The process for reducing the hardness of the fly ash water washing liquid by coupling with alkali metal hydroxide comprises the following specific steps:
S1、CO2extracting;
S2、CO2introducing fly ash washing solution;
s3, adding NaOH;
s4, introducing CO2And adding NaOH for cyclic treatment.
Wherein, the step S1 specifically includes: kiln tail flue gas CO2Including all carbon capture technologies, e.g. pressure swing adsorption purification of CO2Condensing, liquefying and purifying CO2Liquid phase absorption and purification of CO2Processes, membrane separation techniques, and the like.
Wherein, the step S2 specifically includes: CO purified from flue gas in step S12Introducing into water scrubbing solution of fly ash by CO aeration2Aerating in the fly ash washing liquid through an aeration head to achieve the effect of absorption; the spraying absorption mode is that the gas is filled with CO with a certain concentration2Spraying water washing solution of fly ash, water washing solution and CO in an atmosphere container2The contact achieves the absorption effect.
Wherein, the step S3 specifically includes: step S2 introducing CO2Then, the pH value of the solution is reduced while carbonate is generated, and at the moment, the pH value of the solution is properly increased by adding the alkali metal hydroxide NaOH, so that more CO can be dissolved2More carbonate can be generated in the solution, a large amount of calcium ions in the fly ash water washing liquid can be precipitated at the moment, and the concentration of the calcium ions can be reduced to meet the use requirement of a subsequent distillation crystallization system.
Wherein, the step S4 specifically includes: after a certain amount of NaOH is added in the step S3, the hardness of the liquid phase is not less than 200, at the moment, the NaOH needs to be added again, and the CO is introduced again2The hardness of the solution is further reduced until it is less than 200mg/L (calculated as CaO content in the solution).
Wherein the CO after capture and purification in the step S12The concentration is 5-100%.
In the present invention, CO2The utilization mode mainly refers to aeration and spray absorption processes, wherein the former is to distribute CO in liquid phase2The latter being in CO2Liquid-phase water washing liquid is distributed in the gas phase, and the two modes can adjust the pH value of the solution and generate carbonate ions in the solution; the fly ash types aimed by the invention comprise high-chlorine fly ash and low-chlorine fly ash, including but not limited to domestic garbage incineration fly ash, and also comprises all burned fly ash of industrial waste, hazardous waste liquid and the like; in the process of the inventionCO2The adding mode and the adding sequence of the alkali metal hydroxide are not limited, gas can be introduced to directly dissolve or dissolve under pressure, and the alkali metal hydroxide can be added in a solid form or can be dissolved and added; can be NaOH and CO2Can be used in combination, and small amount of Na can also be added2 CO3Compounding NaOH and CO2The final purpose of use is CO2Generating carbonate, and adjusting the pH value of the solution by using alkali metal hydroxide; the process of the present invention is intended to adjust the hardness of the liquid and includes, but is not limited to, calcium ions in the precipitation solution, but also magnesium ions and other types of all metal ions that contribute to the increased hardness of the solution.
The first embodiment is as follows:
taking 1L of fly ash water washing liquid, measuring to obtain the water washing liquid with pH value of 12.82 and hardness of 6800mg/L (calculated by CaO mass), and introducing 40% CO in an aeration manner2Adjusting the pH value of the solution to be 11-13 by using NaOH, and adding CO when the pH value is adjusted to be 11-1322.6L, when the adding amount of NaOH is 4.2g, the pH value of the solution is 12.6, and the hardness of the liquid is measured to be 180mg/L (calculated by the mass of CaO) by titration of an EDTA standard solution; so as to completely replace sodium carbonate. In the example, the pH value is measured by a German Saidishi acidimeter PB-10|, the hardness is measured by a method for measuring the concentration of Ca2+ in EDTA complexometric titration liquid, and the measurement result is measured by CaO.
Example two
Taking 1.5L of water washing solution of fly ash, measuring to obtain a pH value of 13.26 and water washing solution hardness of 12800mg/L (based on CaO mass), and introducing 45% CO by spraying and absorbing2The fly ash water scrubbing solution is sprayed in a container in a circulating way, the PH value of the solution is adjusted to be between 11 and 13 by NaOH, and when CO is introduced cumulatively25.8L, when the adding amount of NaOH is 6.2g, the pH value of the solution is 11.52, and the hardness is 140mg/L (calculated by the mass of CaO); so as to completely replace sodium carbonate. In the example, the pH value is measured by a German Saidishi acidimeter PB-10|, the hardness is measured by a method for measuring the concentration of Ca2+ in EDTA complexometric titration liquid, and the measurement result is measured by CaO.
EXAMPLE III
Taking 2.2L of fly ash water washing liquid, measuring to obtain the water with pH value of 11.8Washing liquid hardness of 24200mg/L (calculated by the mass of CaO), and 42 percent of CO is aerated into the solution2The pH of the solution was adjusted to 13.5 with KOH, at which time 38.5g of KOH38 was added to precipitate calcium ions, and CO was added221.2L, the pH value of the end point of the solution is 12.2, and the hardness is 160mg/L (calculated by the mass of CaO); so as to completely replace sodium carbonate. In the example, the pH value is measured by a German Saidishi acidimeter PB-10|, the hardness is measured by a method for measuring the concentration of Ca2+ in EDTA complexometric titration liquid, and the measurement result is measured by CaO.
Example four
Taking 1.8L of water washing solution of fly ash, measuring to obtain a pH value of 13.05 and a water washing solution hardness of 9860mg/L (calculated by CaO mass), and introducing 46% CO in an aeration manner2Adjusting the pH value of the solution to be 11-13 by using KOH, and adding CO27.6L, when the adding amount of KOH is 15.2g, the pH value of the solution is 11.8, and the hardness is 90mg/L (calculated by the mass of CaO); so as to completely replace sodium carbonate. In the example, the pH value is measured by a German Saidishi acidimeter PB-10|, the hardness is measured by a method for measuring the concentration of Ca2+ in EDTA complexometric titration liquid, and the measurement result is measured by CaO.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1.CO2The process for reducing the hardness of the fly ash water washing liquid by coupling with alkali metal hydroxide is characterized by comprising the following specific steps of:
S1、CO2extracting;
S2、CO2introducing fly ash washing solution;
s3, adding NaOH;
s4, introducing CO2And adding NaOH for cyclic treatment.
2. According to claimCO as claimed in claim 12The process for reducing the hardness of the fly ash water washing liquid by coupling with the alkali metal hydroxide is characterized in that the step S1 specifically comprises the following steps: kiln tail flue gas CO2Including all carbon capture technologies, e.g. pressure swing adsorption purification of CO2Condensing, liquefying and purifying CO2Liquid phase absorption and purification of CO2Processes, membrane separation techniques, and the like.
3. CO according to claim 12The process for reducing the hardness of the fly ash water washing liquid by coupling with the alkali metal hydroxide is characterized in that the step S2 specifically comprises the following steps: CO purified from flue gas in step S12Introducing into water scrubbing solution of fly ash by CO aeration2Aerating in the fly ash washing liquid through an aeration head to achieve the effect of absorption; the spraying absorption mode is that the gas is filled with CO with a certain concentration2Spraying water washing solution of fly ash, water washing solution and CO in an atmosphere container2The contact achieves the absorption effect.
4. CO according to claim 12The process for reducing the hardness of the fly ash water washing liquid by coupling with the alkali metal hydroxide is characterized in that the step S3 specifically comprises the following steps: step S2 introducing CO2Then, the pH value of the solution is reduced while carbonate is generated, and at the moment, the pH value of the solution is properly increased by adding the alkali metal hydroxide NaOH, so that more CO can be dissolved2More carbonate can be generated in the solution, a large amount of calcium ions in the fly ash water washing liquid can be precipitated at the moment, and the concentration of the calcium ions can be reduced to meet the use requirement of a subsequent distillation crystallization system.
5. CO according to claim 12The process for reducing the hardness of the fly ash water washing liquid by coupling with the alkali metal hydroxide is characterized in that the step S4 specifically comprises the following steps: after a certain amount of NaOH is added in the step S3, the hardness of the liquid phase is not less than 200, at the moment, the NaOH needs to be added again, and the CO is introduced again2The hardness of the solution is further reduced until it is less than 200mg/L (calculated as CaO content in the solution).
6. CO according to claim 12The process for reducing the hardness of the fly ash water washing liquid by coupling with the alkali metal hydroxide is characterized in that the CO collected and purified in the step S12The concentration is 5-100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111253789.8A CN113893661A (en) | 2021-10-27 | 2021-10-27 | CO2Process for reducing hardness of fly ash water washing liquid by coupling with alkali metal hydroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111253789.8A CN113893661A (en) | 2021-10-27 | 2021-10-27 | CO2Process for reducing hardness of fly ash water washing liquid by coupling with alkali metal hydroxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113893661A true CN113893661A (en) | 2022-01-07 |
Family
ID=79027053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111253789.8A Pending CN113893661A (en) | 2021-10-27 | 2021-10-27 | CO2Process for reducing hardness of fly ash water washing liquid by coupling with alkali metal hydroxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113893661A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804480A (en) * | 2022-04-13 | 2022-07-29 | 江山市虎鼎环保科技有限公司 | Treatment method of fly ash washing liquid |
| CN115626656A (en) * | 2022-09-28 | 2023-01-20 | 江西盖亚环保科技有限公司 | Preparation method of calcium carbonate based on waste incineration fly ash |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000144271A (en) * | 1998-11-13 | 2000-05-26 | Yoshizawa Lime Industry | Method of recovering heavy metal from molten fly ash |
| CN101687648A (en) * | 2007-12-28 | 2010-03-31 | 卡勒拉公司 | methods of sequestering co2 |
| TW201348143A (en) * | 2012-05-28 | 2013-12-01 | Wu-Jang Huang | A regeneration method for high-hardness wastewater containing heavy metal |
| CN104529011A (en) * | 2015-01-05 | 2015-04-22 | 北京建筑材料科学研究总院有限公司 | Device and method for reducing hardness and pH value of waste incineration fly ash washing liquid |
| CN111233121A (en) * | 2020-02-12 | 2020-06-05 | 北京科技大学 | Utilizing CO in cement kiln tail gas2System and method for pretreating fly ash washing wastewater |
| CN113332927A (en) * | 2021-05-25 | 2021-09-03 | 杭州灰弘环保科技有限公司 | Novel coupling system and method for pulping, washing and carbon neutralization of waste incineration fly ash |
| CN113477670A (en) * | 2021-07-08 | 2021-10-08 | 江苏瑞达环保科技有限公司 | Carbon neutralization-based household garbage incineration fly ash resource utilization process |
-
2021
- 2021-10-27 CN CN202111253789.8A patent/CN113893661A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000144271A (en) * | 1998-11-13 | 2000-05-26 | Yoshizawa Lime Industry | Method of recovering heavy metal from molten fly ash |
| CN101687648A (en) * | 2007-12-28 | 2010-03-31 | 卡勒拉公司 | methods of sequestering co2 |
| TW201348143A (en) * | 2012-05-28 | 2013-12-01 | Wu-Jang Huang | A regeneration method for high-hardness wastewater containing heavy metal |
| CN104529011A (en) * | 2015-01-05 | 2015-04-22 | 北京建筑材料科学研究总院有限公司 | Device and method for reducing hardness and pH value of waste incineration fly ash washing liquid |
| CN111233121A (en) * | 2020-02-12 | 2020-06-05 | 北京科技大学 | Utilizing CO in cement kiln tail gas2System and method for pretreating fly ash washing wastewater |
| CN113332927A (en) * | 2021-05-25 | 2021-09-03 | 杭州灰弘环保科技有限公司 | Novel coupling system and method for pulping, washing and carbon neutralization of waste incineration fly ash |
| CN113477670A (en) * | 2021-07-08 | 2021-10-08 | 江苏瑞达环保科技有限公司 | Carbon neutralization-based household garbage incineration fly ash resource utilization process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804480A (en) * | 2022-04-13 | 2022-07-29 | 江山市虎鼎环保科技有限公司 | Treatment method of fly ash washing liquid |
| CN115626656A (en) * | 2022-09-28 | 2023-01-20 | 江西盖亚环保科技有限公司 | Preparation method of calcium carbonate based on waste incineration fly ash |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113893661A (en) | CO2Process for reducing hardness of fly ash water washing liquid by coupling with alkali metal hydroxide | |
| CN106673022B (en) | A method of LITHIUM BATTERY Lithium hydroxide monohydrate is produced from battery-level lithium carbonate | |
| CN113145608A (en) | System and process for treating incineration fly ash through thermal desorption and carbon neutralization | |
| CN112374521A (en) | Process for extracting calcium chloride from waste incineration fly ash | |
| CN108396158A (en) | A kind of processing method of the complex salt crystal object of electrolytic manganese process | |
| CN113955889A (en) | Resource recovery process of fly ash washing liquid | |
| CN101745309A (en) | Flue gas desulfurization (FGD) and comprehensive utilization method for flyash pudding blast furnace slag | |
| CN112919499A (en) | Method for recycling sodium bicarbonate dry-process desulfurized fly ash | |
| CN114888056B (en) | Method for synchronously solidifying carbon dioxide and deeply dechlorinating waste incineration fly ash | |
| CN102910760A (en) | Treatment process of contaminated acid containing heavy metals | |
| CN113754162A (en) | Method and system for recovering chloride by crystallizing acidic washing wastewater | |
| CN103482655A (en) | Lime-sodium sulfate-carbon dioxide method used for purifying calcium chloride type bittern | |
| CN111424168A (en) | Water-washing dechlorination system and method for metallurgical precipitator dust | |
| HU213383B (en) | Method for producing aqueous sodium chloride solution and crystalline sodium chloride | |
| CN110229964B (en) | Method for extracting rubidium from fly ash | |
| CN101775497B (en) | Method for recovering metal by using waste common zinc-manganese battery to purify flue gas | |
| CN115155279A (en) | Flue gas deacidification coupling fly ash treatment method | |
| JP5114820B2 (en) | Sodium chloride purification method and sodium hydroxide production method | |
| JP2012055851A (en) | Refining method of by-product salt, by-product salt, and antifreezing agent | |
| CN109095484A (en) | A method of utilizing desulfurization wastewater preparing magnesium hydroxide | |
| CN106746101B (en) | Method for treating ethylene waste alkali liquor | |
| CN213701193U (en) | Resourceful treatment device for mother liquor generated by reaction of waste incineration fly ash and hydrochloric acid | |
| CN101792861B (en) | Method for recovering metal by using waste alkaline zinc-manganese battery to purify flue gas | |
| CN207361982U (en) | The special equipment of flying dust washings processing technique | |
| CN114231741B (en) | Method for selectively separating lithium from potassium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |