CN114570204A - Method for dealkalizing and soil-working red mud mediated by organic amine - Google Patents
Method for dealkalizing and soil-working red mud mediated by organic amine Download PDFInfo
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- 150000001412 amines Chemical class 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 51
- 230000001404 mediated effect Effects 0.000 title claims abstract description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 238000011069 regeneration method Methods 0.000 claims abstract description 14
- 230000008929 regeneration Effects 0.000 claims abstract description 13
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 10
- 238000003795 desorption Methods 0.000 claims abstract description 7
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 5
- 239000000047 product Substances 0.000 claims abstract description 5
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 4
- 239000002689 soil Substances 0.000 claims abstract description 3
- 239000006228 supernatant Substances 0.000 claims abstract 2
- 239000000243 solution Substances 0.000 claims description 43
- 239000007788 liquid Substances 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 10
- 239000011734 sodium Substances 0.000 claims description 7
- 230000035484 reaction time Effects 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000004131 Bayer process Methods 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 3
- 150000003141 primary amines Chemical class 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 150000003335 secondary amines Chemical class 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000005245 sintering Methods 0.000 claims description 2
- 150000003512 tertiary amines Chemical class 0.000 claims description 2
- 239000006096 absorbing agent Substances 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 11
- 239000006227 byproduct Substances 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 238000009270 solid waste treatment Methods 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 24
- 239000003513 alkali Substances 0.000 description 13
- 239000002699 waste material Substances 0.000 description 5
- 229910021532 Calcite Inorganic materials 0.000 description 4
- 230000033558 biomineral tissue development Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000002440 industrial waste Substances 0.000 description 4
- 238000002386 leaching Methods 0.000 description 4
- 238000006386 neutralization reaction Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical class OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 2
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910020814 NaAl(OH)4 Inorganic materials 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000001994 activation Methods 0.000 description 1
- 230000004075 alteration Effects 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
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052663 cancrinite Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 125000005587 carbonate group Chemical group 0.000 description 1
- 229910001748 carbonate mineral Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910052665 sodalite Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
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- 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
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/22—Purification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/80—Organic bases or salts
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
Abstract
The invention discloses an organic amine mediated red mud dealkalization and soil treatment method, and belongs to the field of solid waste treatment. The method is realized by the following steps: (1) in the organic amine regeneration reactor A, the organic amine captures CO2Post-formation of CO-rich2Part of the solution is mixed with the red mud by-product solution, the reaction product is high-concentration carbonate solution and contains CO2The organic amine is regenerated; (2) in a red mud dealkalization reactor B, the CO-rich collected by the organic amine2Mixing the solution with red mud, wherein the reaction product is dealkalized red mud, and the supernatant is conveyed to a red mud dealkalization reactor A; (3) Concentrating and purifying the high-concentration carbonate solution, and recovering to obtain a sodium carbonate product; (4) the organic amine after desorption and regeneration returns to the absorption device to continuously capture CO2A gas. The invention not only realizes the low-cost desorption regeneration of the organic amine, but also realizes the carbon capture and the sodium carbonate recovery; and simultaneously realizes dealkalization and stabilization of the red mud.
Description
Technical Field
The invention belongs to the field of comprehensive utilization of resources, and particularly relates to a method for dealkalizing and soil-working red mud mediated by organic amine.
Background
The red mud is a large industrial waste discharged during the extraction of alumina, and by 2020, the red mud stockpiling quantity of China breaks through 16 hundred million tons, and the comprehensive utilization rate of the red mud is only 1%. The red mud contains a large amount of chemically bound alkali and free alkali, and the dealkalization process is severely restricted because the release rate of the chemically bound alkali is slow and difficult. High-alkalinity Na released by conventional red mud stockpiling2O can pollute the surrounding farmland and water systems, and also pollute the atmospheric environment due to alkali-containing dust, thus seriously harming the health of surrounding residents.
The red mud dealkalization method comprises a water washing method, an acid leaching method, a lime method, a salt leaching method and CO2The method and the industrial three-waste neutralization method. The water washing method mainly removes free alkali and cannot remove chemically combined alkali; although the acid leaching method, the lime method and the salt leaching method can remove free alkali and combined alkali of the red mud, the economic cost is higher; CO 22The method and the industrial three-waste neutralization method can realize the coordinated treatment of wastes. Introducing CO2The method and the industrial three-waste neutralization method are combined for use, so that not only can CO be realized2The capture and sealing can remove free alkali and combined alkali in the red mud, and realize the dealkalization and discharge of greenhouse gases and red mud.
Typical of industry CO2The chemical absorption trapping technology comprises the following steps: ammonia absorption method, hot potash method, organic amine method, etc., for absorbing CO by using organic amine containing water2The technology is mature and the application is wide. Absorption of CO by aqueous organic amines2Some challenges are faced in the application of technology: (1) Absorption of CO during desorption regeneration2The water in the air flow needs an additional drying step, so that the energy consumption is high; (2) high temperature desorption regeneration processes can lead to absorbent degradation and equipment corrosion problems. The recovery and regeneration of the organic amine become the organic amine for trapping CO2The key technical problem of (2).
CO2The capture, fixation and utilization (CCUS) technique is due to CO2Low concentration, resulting in slower rate of mineralization, CO enrichment by organic amine capture2Liquid, increasing HCO in solution3-The concentration is favorable for improving the mineralization rate of the red mud, and the industrial application is convenient.
The patent with application publication number CN 110655342A discloses a modified red mud capable of absorbing, solidifying and sealing up carbon dioxide and a preparation method thereof, and the patent needs procedures of high-temperature activation, ball milling, drying and the like on the red mud, and has high energy consumption and complex working procedures.
Disclosure of Invention
Aiming at dealkalization and greenhouse gas CO in the comprehensive utilization process of red mud2The invention provides a method for dealkalizing and converting red mud into soil by organic amine. The invention converts CO into2Products of amine chemical absorption with CO2The mineralization process is combined, the problem of high heating energy consumption in the organic amine regeneration of the traditional organic amine trapping process is solved, the process flow is simplified, the reaction condition is mild, and the CO is favorably used for CO2The emission reduction and the dealkalization and reutilization of the red mud.
The invention is realized by the following technical scheme:
(1) washing the red mud with water at room temperature to obtain a dissolved-out red mud attached solution and the washed red mud; organic amine capture CO2CO formed later2The rich solution is reserved;
(2) in the red mud dealkalization reactor A, organic amine is used for capturing CO2CO formed later2Mixing one part of the pregnant solution with the red mud absorption solution to react, wherein a reaction product is a carbonate solution, and organic amine is liberated due to chemical desorption;
(3) in a red mud dealkalization reactor B, organic amine is used for capturing CO2CO formed later2After rich solution and water washingThe red mud is mixed and reacted, solid-liquid separation is carried out, filter residues are dealkalized red mud and are directly discharged, and supernate is conveyed to a red mud dealkalization reactor A;
(4) concentrating and purifying the obtained high-concentration carbonate solution, and recovering to obtain a sodium carbonate product; the obtained organic amine after desorption and regeneration returns CO2In the absorption apparatus, CO continues to be trapped2A gas.
Preferably, the red mud is any one or more of bayer process red mud, mixed process red mud and sintering process red mud.
Further, the red mud is preferably Bayer process red mud.
Preferably, the pH of the red mud attaching solution is 7-13, and Na is added+The concentration is not less than 1 × 10-7mol/L。
Further, the pH of the red mud attaching solution is 9-13, and Na is contained+The concentration is not less than 0.1 mol/L.
Preferably, the organic amine is any one or more of primary amine, secondary amine, tertiary amine and steric hindrance amine, and the CO is2The rich solution is saturated CO2And (4) enriching the liquid.
Further, the organic amine is one or More of Ethanolamine (MEA), Diethanolamine (DEA) and N-Methyldiethanolamine (MDEA).
Preferably, in the step (1), water is added to adjust the solid-liquid ratio to 1-8: 1, and the washing times are 1-10 times.
Further, in the step (1), the washing frequency of the red mud is 3-5 times, and the mass ratio of the water consumption to the red mud is 3: 1-6: 1.
Preferably, the mixing in the step (2) is to adjust the red mud effluent and CO2HCO in rich solution mixed solution3 -The concentration is 1X 10-7～1×10-1mol/L。
Further, in the step (2), adjusting the red mud liquid and CO2HCO in rich solution mixed solution3-The concentration is 1X 10-5～1×10-2mol/L。
Preferably, in the step (2), the reaction temperature is 0-150 ℃, the reaction time is 0-5 h, and the stirring speed is 100-600 r/min.
Further, in the step (2), the reaction temperature is 60-100 ℃, the stirring speed is 100-300 r/min, and the reaction time is 1.5-4 h.
Preferably, the mixing in the step (3) is to control the mass concentration of the slurry to be 1: 10-10: 1.
preferably, the reaction temperature in the step (3) is 0-60 ℃, the stirring speed is 0-600 r/min, and the reaction time is 0-50 h.
Furthermore, in the step (3), the reaction temperature is 30-50 ℃, the stirring speed is 100-300 r/min, and the reaction time is 2-24 h.
The invention principle of the invention is as follows:
organic amine for capturing CO2CO generated after2The rich solution can be mixed with free alkali (NaOH, Na) in the red mud waste solution2CO3、NaHCO3、NaAl(OH)4Etc.) to generate sodium carbonate, and the sodium carbonate can be recycled after dehydration and concentration. Organic amine for capturing CO2CO generated after2The pregnant solution can be in carbonation reaction with chemically combined alkali (sodalite, cancrinite, garnet, etc.) in the red mud to generate carbonate minerals, the combined alkali in the water-washed red mud is removed, and the dealkalization of the red mud is finally realized. Organic amine for capturing CO2CO generated after2In the rich solution, highly saturated bicarbonate ions and the red mud attaching solution are subjected to neutralization reaction, and the reaction is maintained at a high rate; on the other hand, consumption of bicarbonate desorbs the organic amine. In the process of purifying and heating the sodium carbonate, the purification of the sodium carbonate can be realized, and the regeneration of the organic amine can also be realized.
Compared with the prior art, the invention has the beneficial effects that:
the invention converts CO into2Products of amine chemical absorption with CO2The mineralization process is combined, the problem of high heating energy consumption in the organic amine regeneration of the traditional organic amine trapping process is solved, the process flow is simplified, the reaction condition is mild, and the CO is favorably used for CO2The emission reduction and the dealkalization and reutilization of the red mud.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to be limiting in any way, and any modifications or alterations based on the teachings of the present invention are intended to fall within the scope of the present invention.
Example 1
(1) Regulating solid-to-liquid ratio of Bayer process red mud at room temperature to 5:1, soaking for 1 day, washing for 5 times, and dissolving red mud eluate with pH of 11.7 and Na+The concentration was 150 mg/L.
(2) Absorbing CO in mixed organic amine solution for a certain factory2Saturated CO formed after industrial waste gas2Introducing the rich solution into the red mud solution to generate Na at normal temperature and normal pressure2CO3The alkalinity of the red mud attached liquid is reduced, and the regeneration of organic amine can be realized.
(3) Mixing the above CO2Introducing the rich solution into red mud, mixing to obtain 10% red mud slurry, reacting at 40 deg.C for 2 hr at a stirring speed of 500 r/min, and detecting that the content of tricalcium aluminate in red mud is reduced and calcite (CaCO)3) The content is increased, and the pH value of the red mud is reduced to 6.
Example 2
(1) The solid-liquid ratio of certain Bayer process red mud is adjusted to be 3:1 at room temperature, and the red mud is washed for 3 times after being soaked for 1 day to dissolve out red mud attached liquid.
(2) Absorbing CO in mixed organic amine solution for a certain factory2Saturated CO formed after industrial waste gas2The rich solution is mixed with the red mud sub-solution and reacts for 1 hour at 40 ℃ and under negative pressure (0.05 MPa), and the solution contains 3-5% of Na2CO3The alkalinity of the red mud attached liquid is reduced, and the regeneration of the organic amine can be better realized.
(3) Mixing the above CO2Introducing the rich solution into red mud, mixing to obtain 20% red mud slurry, reacting at 50 deg.C for 3 hr with stirring speed of 500 r/min to obtain calcite (CaCO) in red mud3) The content is increased, and the alkalinity of the red mud is obviously reduced.
Example 3
Absorbing CO with a single organic amine in a plant2Saturated CO formed after industrial waste gas2The rich solution is mixed with the red mud by-product solution, the reaction temperature is 90 ℃, and Na is generated under normal pressure2CO3The alkalinity of the red mud attached liquid is reduced, and the regeneration of organic amine can be realized.
Mixing the above CO2Introducing the rich solution into red mud, mixing to obtain 30% red mud slurry, reacting at 40 deg.C for 4 hr at stirring speed of 300 r/min, and reducing tricalcium aluminate content in red mud to obtain calcite (CaCO)3) The content is increased, and the pH value of the red mud is obviously reduced.
Example 4
(1) The red mud is dried for two weeks in the natural condition and then is placed in a drying oven at 105 ℃ to be dried to constant weight for later use. Placing the red mud in a reactor, and reacting according to the weight ratio of 5: washing the red mud for 4 times according to the liquid-solid ratio of 1, and separating the red mud attaching liquid and the red mud washed by water.
(2) CO absorption from organic amines2Mixing the pregnant solution and the red mud by-product solution at 110 deg.C for 2h, stirring at 500 r/min, stabilizing the pH value of the red mud by-product solution at 6.3, and adding Na2CO3Mainly comprises the following steps.
(3) CO absorption from organic amines2The pregnant solution and the washed red mud are mixed into 20 percent red mud slurry, the mixture reacts for 24 hours at normal temperature, the stirring speed is 500 r/min, and finally, calcite (CaCO) in the red mud3) The content is increased, and the alkalinity of the red mud is obviously reduced.
Claims (9)
1. An organic amine mediated red mud dealkalization and soil improvement method is characterized by comprising the following steps:
(1) washing the red mud with water at room temperature to obtain a dissolved-out red mud attached solution and the washed red mud; organic amine capture CO2CO formed later2The rich solution is reserved;
(2) in the red mud dealkalization reactor A, organic amine is used for capturing CO2CO formed later2Mixing one part of the pregnant solution with the red mud attaching solution, reacting to obtain a carbonate solution as a reaction product, and chemically desorbing organic amine;
(3) in the red mud dealkalization reactor B, the organic amine is capturedCO2CO formed later2Mixing the pregnant solution and the washed red mud, reacting, performing solid-liquid separation, directly discharging filter residues which are dealkalized red mud, and conveying the supernatant to a red mud dealkalization reactor A;
(4) concentrating and purifying the obtained high-concentration carbonate solution, and recovering to obtain a sodium carbonate product; the obtained organic amine after desorption and regeneration returns CO2Continuously capturing CO in the absorber2A gas.
2. The method for dealkalizing and argillizing red mud mediated by organic amine according to claim 1, wherein the red mud is any one or more of bayer process red mud, mixed process red mud and sintering process red mud.
3. The method for dealkalizing and argillizing red mud mediated by organic amine according to claim 1, wherein the pH of the red mud effluent is 7-13, and Na is contained in the red mud effluent+The concentration is not less than 1 × 10-7mol/L。
4. The method of dealkalizing and argillizing red mud as claimed in claim 1, wherein said organic amine is any one or more of primary amine, secondary amine, tertiary amine and sterically hindered amine, and said CO is2The rich solution is saturated CO2And (4) enriching the liquid.
5. The method for dealkalizing and argillizing red mud mediated by organic amine according to claim 1, wherein the water washing in the step (1) is water addition for adjusting the solid-to-liquid ratio to 1-8: 1, and the washing times are 1-10 times.
6. The method for dealkalizing and argillizing red mud as claimed in claim 1, wherein said mixing in step (2) is adjusting red mud leachate and CO2HCO in rich solution mixed solution3 -The concentration is 1X 10-7～1×10-1mol/L。
7. The method for dealkalizing and argillizing red mud mediated by organic amine according to claim 1, wherein the reaction temperature in step (2) is 0-150 ℃, the reaction time is 0-5 h, and the stirring speed is 100-600 r/min.
8. The method for dealkalizing and argillizing red mud according to claim 1, wherein the mixing in the step (3) is performed by controlling the mass concentration of the slurry to be 1: 10-10: 1.
9. the method for dealkalizing and argillizing red mud mediated by organic amine according to claim 1, wherein the reaction temperature in the step (3) is 0-60 ℃, the stirring speed is 0-600 r/min, and the reaction time is 0-50 h.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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