CN117263547A - Two-stage alkali-excited full-solid waste low-carbon polymer and preparation method thereof - Google Patents
Two-stage alkali-excited full-solid waste low-carbon polymer and preparation method thereof Download PDFInfo
- Publication number
- CN117263547A CN117263547A CN202311531369.0A CN202311531369A CN117263547A CN 117263547 A CN117263547 A CN 117263547A CN 202311531369 A CN202311531369 A CN 202311531369A CN 117263547 A CN117263547 A CN 117263547A
- Authority
- CN
- China
- Prior art keywords
- excitation
- solid waste
- stage
- carbon polymer
- mass
- 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.)
- Granted
Links
- 239000002910 solid waste Substances 0.000 title claims abstract description 64
- 229920000642 polymer Polymers 0.000 title claims abstract description 47
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 230000005284 excitation Effects 0.000 claims abstract description 99
- 239000000463 material Substances 0.000 claims abstract description 89
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 70
- 239000011499 joint compound Substances 0.000 claims abstract description 67
- 239000002893 slag Substances 0.000 claims abstract description 58
- 239000003245 coal Substances 0.000 claims abstract description 45
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 30
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000011449 brick Substances 0.000 claims abstract description 24
- 238000002309 gasification Methods 0.000 claims abstract description 24
- 239000002699 waste material Substances 0.000 claims abstract description 24
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 10
- 239000003513 alkali Substances 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 15
- 239000000292 calcium oxide Substances 0.000 claims description 14
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 14
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 13
- 230000003213 activating effect Effects 0.000 claims description 5
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 230000004913 activation Effects 0.000 claims 2
- 239000000378 calcium silicate Substances 0.000 abstract description 18
- 229910052918 calcium silicate Inorganic materials 0.000 abstract description 18
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 abstract description 18
- 229910052710 silicon Inorganic materials 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 4
- 239000003469 silicate cement Substances 0.000 abstract description 2
- 239000002956 ash Substances 0.000 description 41
- 230000036571 hydration Effects 0.000 description 10
- 238000006703 hydration reaction Methods 0.000 description 10
- 239000000243 solution Substances 0.000 description 10
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 229910004298 SiO 2 Inorganic materials 0.000 description 6
- 239000004568 cement Substances 0.000 description 6
- 239000012670 alkaline solution Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 229910000323 aluminium silicate Inorganic materials 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910008455 Si—Ca Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000000404 calcium aluminium silicate Substances 0.000 description 2
- 235000012215 calcium aluminium silicate Nutrition 0.000 description 2
- WNCYAPRTYDMSFP-UHFFFAOYSA-N calcium aluminosilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O WNCYAPRTYDMSFP-UHFFFAOYSA-N 0.000 description 2
- 229940078583 calcium aluminosilicate Drugs 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- JLDKGEDPBONMDR-UHFFFAOYSA-N calcium;dioxido(oxo)silane;hydrate Chemical compound O.[Ca+2].[O-][Si]([O-])=O JLDKGEDPBONMDR-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 241001591024 Samea Species 0.000 description 1
- 230000006978 adaptation 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
- 239000004566 building material Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- -1 gangue Substances 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
-
- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of solid waste material excitation. The invention provides a two-stage alkali-excited full-solid waste low-carbon polymer and a preparation method thereof, wherein the preparation raw materials of the two-stage alkali-excited full-solid waste low-carbon polymer comprise excitation materials, white mud, potassium hydroxide and water; the mass of the white mud is 5-15% of the mass of the excitation material; the mass of the potassium hydroxide is 5-12% of the mass of the exciting material, and the water-gel ratio is 0.30-0.34; the excitation material comprises coal gangue, coal gasification ash, calcium silicate slag, waste red bricks, red mud, nickel slag and aluminum ash. The method is characterized in that industrial solid waste rich in Si and Al is used as a raw material, the raw material is mixed with white mud to carry out solid-solid one-stage excitation at high temperature, then the mixture is added into potassium hydroxide solution to carry out solid-liquid two-stage excitation, and the total solid waste low-carbon polymer with an amorphous-semi-crystalline three-dimensional network structure is obtained through the two-stage excitation, so that the total solid waste low-carbon polymer has good mechanical properties, and can replace the use scene of the traditional silicate cement.
Description
Technical Field
The invention relates to the technical field of solid waste material excitation, in particular to a two-stage alkali-excited full solid waste low-carbon polymer and a preparation method thereof.
Background
The preparation of the cementing material based on the multi-element solid waste synergistically excited by the alkaline solution of the calcium oxide has better excitation effect than the preparation of the cementing material by single excitation of the alkaline solution. CN 115368035A uses limestone, fly ash, blast furnace slag, carbide slag and sodium hydroxide as raw materials, and introduces the concrete steps of preparing the multi-element solid waste cementing material by synergic excitation of the calcium-rich carbide slag in an alkaline environment; the prepared multi-element solid waste cementing material has high strength, better working performance and economic benefit. However, the solid waste materials consumed by the device are single, and no systematic study is performed on different solid waste materials and water-gel ratios. Patent CN115572087 a describes specific steps of adding silicate raw material (glass slag), polymerization inhibitor and surfactant into alkali solution to prepare excitant, and its excitation effect is superior to that of single alkali solution. But the excited materials are slag, fly ash and quartz sand, so that the solid waste is less. Patent CN 114426405A will K 2 CO 3 And K 2 SiO 3 The solution is added into the slag and white mud composite material to perform acidic activity excitation, and the prepared cementing material has good mechanical properties. But it only describes the excitation step in an acidic environment and its excitation pattern is relatively single. The traditional Portland cement consumes a large amount of non-renewable energy sources in the production process, generates a large amount of carbon dioxide, causes great pollution to the environment, and needs to find green building materials to replace common Portland cement so as to obtain the excited solid waste low-carbon polymer.
Therefore, the research results in an alkali-excited full-solid waste low-carbon polymer which is suitable for various solid waste materials and combines various excitation modes, and has important significance.
Disclosure of Invention
The invention aims to provide a two-stage alkali-activated full-solid waste low-carbon polymer and a preparation method thereof, aiming at the defects of the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a two-stage alkali-activated full-solid waste low-carbon polymer, wherein the preparation raw materials of the two-stage alkali-activated full-solid waste low-carbon polymer comprise an activating material, white mud, potassium hydroxide and water;
the mass of the white mud is 5-15% of the mass of the excitation material; the mass of the potassium hydroxide is 5-12% of the mass of the excitation material.
Preferably, the water-gel ratio is 0.30-0.34.
Preferably, the excitation material comprises coal gangue, coal gasification ash, silica-calcium slag, waste red bricks, red mud, nickel slag and aluminum ash, wherein the mass ratio of the coal gangue to the coal gasification ash to the silica-calcium slag to the waste red bricks to the red mud to the nickel slag to the aluminum ash is (10-20): 15-20: 15-25: 12-20: 12-20: 5-10: 5-10.
Preferably, the grain diameter of the exciting material is less than or equal to 45 mu m, and the grain diameter of the white mud is less than or equal to 75 mu m.
Preferably, the content of calcium oxide in the white mud is more than or equal to 80wt%, and the pH value of the white mud is more than or equal to 12.
The invention also provides a preparation method of the two-stage alkali-activated full-solid waste low-carbon polymer, which comprises the following steps:
1) Mixing the excitation material and white mud to carry out solid fixation for one section of excitation to obtain one section of excitation material;
2) And mixing the first-stage excitation material, potassium hydroxide and water to perform solid-liquid two-stage excitation to obtain the two-stage alkali-excited full-solid waste low-carbon polymer.
Preferably, the excitation temperature of the solid-fixing section is 780-830 ℃.
Preferably, the time for fixing one section of excitation is 1.5-2.5 hours.
The beneficial effects of the invention include the following points:
1) The method comprises the steps of mixing industrial solid wastes (coal gangue, coal gasification ash, silicon calcium slag, waste red bricks, red mud, nickel slag, aluminum ash and the like) which are rich in silicon (Si) and aluminum (Al) serving as raw materials with white mud, performing solid-solid primary excitation at high temperature, and adding the excited industrial solid wastes and the white mud into potassium hydroxide solution for solid-liquid secondary excitation. Obtaining a full-amorphous to semi-crystalline three-dimensional network structure through two excitationsThe solid waste low-carbon polymer (aluminosilicate novel cementing material) has good mechanical property, corrosion resistance and high temperature resistance, and can replace the use scene of the traditional silicate cement. One of the advantages of the all-solid waste low-carbon polymer is that CO is produced in the production process 2 The emission, energy loss and cost are greatly reduced, and the greenhouse gas emission of the total solid waste low-carbon polymer is 20-80% lower than that of ordinary Portland cement. In addition, the full solid waste low-carbon polymer absorbs a large amount of solid waste (coal gangue, coal gasification ash, silicon calcium slag, waste red bricks, red mud, nickel slag, aluminum ash and white mud), and is beneficial to realizing the sustainable development of the environment.
2) In the solid-solid one-stage excitation process, impurities in the excitation material are removed, and a large amount of calcium oxide in the white mud, si and Al generate CaO-SiO 2 、CaO-Al 2 O 3 -SiO 2 、CaO-Al 2 O 3 The system is compared with the traditional SiO generated when various materials are heated independently 2 、Al 2 O 3 The system is CaO-SiO regenerated by breaking the silicon oxygen bond, the aluminum oxygen bond and the carbon oxygen bond 2 、CaO-Al 2 O 3 -SiO 2 、CaO-Al 2 O 3 The system increases the activity of the excitation material, so that the excitation effect is better after the excitation material is dissolved in alkaline solution. When the solid-liquid two-stage excitation is carried out, calcium oxide in the white mud reacts with water to generate calcium hydroxide, and the calcium hydroxide solution and the potassium hydroxide solution are used as excitation solutions, so that the excitation material has stronger alkalinity, is more favorable for hydration of glass bodies in the excitation material compared with the single use of the potassium hydroxide solution as the excitation solution, and has better excitation effect. In addition, can also generateAnd gel with a network structure is filled, so that good mechanical properties are provided.
Detailed Description
The invention provides a two-stage alkali-activated full-solid waste low-carbon polymer, wherein the preparation raw materials of the two-stage alkali-activated full-solid waste low-carbon polymer comprise an activating material, white mud, potassium hydroxide and water;
the mass of the white mud is 5-15% of the mass of the excitation material; the mass of the potassium hydroxide is 5-12% of the mass of the excitation material.
In the invention, the mass of the white mud is preferably 7-12% of the mass of the excitation material, more preferably 9-11% of the mass of the excitation material, and even more preferably 10% of the mass of the excitation material; the mass of potassium hydroxide is preferably 5-12% of the mass of the exciting material, more preferably 7-10% of the mass of the exciting material, and even more preferably 8-9% of the mass of the exciting material.
In the present invention, the water-gel ratio is preferably 0.30 to 0.34, more preferably 0.31 to 0.33, and still more preferably 0.32.
In the invention, the water-gel ratio is the mass ratio of water to the two-stage alkali-activated total solid waste low-carbon polymer (cementing material). The alkali-activated cementing material is a polymer synthesized by alkali-activated reaction of an aluminosilicate material mixed in an alkali-activated agent to form an amorphous phase and a three-dimensional aluminosilicate network structure.
In the invention, the excitation material preferably comprises coal gangue, coal gasification ash, calcium silicate slag, waste red bricks, red mud, nickel slag and aluminum ash, and the mass ratio of the coal gangue to the coal gasification ash to the calcium silicate slag to the waste red bricks is preferably 10-20: 15-20: 15-25: 12-20: 12-20: 5-10: 5 to 10, more preferably 12 to 18: 16-19: 17-23: 15-18: 15-18: 6-9: 6 to 9, more preferably 14 to 15: 17-18: 19-20: 16-17: 16-17: 7-8: 7-8.
In the invention, al in gangue 2 O 3 The content is more than or equal to 45 weight percent, siO 2 The content is more than or equal to 50 weight percent, and the loss on ignition is more than or equal to 12 weight percent; al in coal gasification ash 2 O 3 The content is more than or equal to 14 weight percent, siO 2 The content is more than or equal to 42 weight percent, and the loss on ignition is more than or equal to 18 weight percent; al in Si-Ca slag 2 O 3 The content is more than or equal to 10 weight percent, siO 2 The content is more than or equal to 26 weight percent, and the loss on ignition is more than or equal to 6 weight percent;
al in waste red bricks 2 O 3 The content is more than or equal to 14 weight percent, siO 2 The content is more than or equal to 60 weight percent, and the loss on ignition is more than or equal to 3 weight percent; al in red mud 2 O 3 The content is more than or equal to 10 weight percent, siO 2 The content is more than or equal to 55wt percent, and the loss on ignition is more than or equal to 8wt percent; al in aluminum ash 2 O 3 The content is more than or equal to 60 weight percent, siO 2 The content is more than or equal to 13 weight percent, and no loss on ignition is caused.
The industrial solid waste such as gangue, coal gasification ash, calcium silicate slag, waste red bricks, red mud, nickel slag, aluminum ash and the like contains se:Sub>A large amount of silicon (Si) and aluminum (Al), and the industrial solid waste can be excited by alkaline substances, and the generated hydration products mainly comprise calcium aluminosilicate (C-A-S-H) and calcium silicate hydrate (C-S-H), so that the all-solid waste low-carbon polymer with an amorphous-semi-crystalline three-dimensional network structure is prepared.
In the present invention, the particle diameter of the exciting material is preferably not more than 45. Mu.m, more preferably not more than 40. Mu.m, still more preferably not more than 35. Mu.m; the particle size of the white mud is preferably not more than 75. Mu.m, more preferably not more than 70. Mu.m, still more preferably not more than 60. Mu.m.
In the invention, the content of calcium oxide in the white mud is preferably more than or equal to 80wt%, and the pH value of the white mud is preferably more than or equal to 12.
The invention also provides a preparation method of the two-stage alkali-activated full-solid waste low-carbon polymer, which comprises the following steps:
1) Mixing the excitation material and white mud to carry out solid fixation for one section of excitation to obtain one section of excitation material;
2) And mixing the first-stage excitation material, potassium hydroxide and water to perform solid-liquid two-stage excitation to obtain the two-stage alkali-excited full-solid waste low-carbon polymer.
In the invention, the excitation temperature of the solid-solid section is preferably 780-830 ℃, more preferably 790-820 ℃, and even more preferably 800-810 ℃.
In the invention, the time for fixing and fixing one-stage excitation is preferably 1.5-2.5 h, and more preferably 2h.
In the invention, the mixing in the step 2) is preferably uniform mixing of potassium hydroxide and water to obtain a potassium hydroxide solution, and the potassium hydroxide solution is mixed with a section of excitation material; stirring in the mixing process until the uniform all-solid waste low-carbon polymer is obtained.
In the solid-liquid two-stage excitation, potassium hydroxide reacts with Si and Al in the first-stage excitation material to generate hydration products calcium aluminosilicate (C-A-S-H) and calcium silicate hydrate (C-S-H). The main component of the white mud is calcium oxide after high-temperature treatment, and the calcium oxide is dissolved in water to increase the alkaline strength of the water and increase the effect of solid-liquid alkali excitation.
White mud for paper-makingAn industrial solid waste generated in the factory production process is mostly treated by landfill or piling of white mud. Along with rain wash, impurities in the white mud can permeate into the ground, and serious pollution is caused to surrounding soil and groundwater resources. The main component of the white mud is calcium carbonate, which is decomposed into calcium oxide at 714.9 ℃. Mixing white mud serving as an exciting agent with industrial solid waste (coal gangue, coal gasification ash, calcium silicate slag, waste red bricks, red mud, nickel slag and aluminum ash), calcining at 800-850 ℃ for 1.5-2.5 hours, completely converting calcium hydroxide and calcium carbonate in the white mud into calcium oxide, removing impurities in the exciting material, wherein a silicon and aluminum system and the calcium oxide generate CaO-SiO 2 、CaO-Al 2 O 3 -SiO 2 、CaO-Al 2 O 3 The activity of the system is better than that of CaO and Al 2 O 3 And SiO 2 The simple substance system can lead industrial solid waste to be better primarily excited, and then the secondary excitation of potassium hydroxide solution is combined, so that the prepared full solid waste low-carbon polymer has better mechanical property, and simultaneously more solid waste is consumed, thereby reducing the pollution to the environment in the production process of the excitant.
The solid-liquid two-stage excitation reaction is divided into three main stages: (1) The calcined calcium oxide in the white mud is fused with water, so that the alkalinity of the solution is increased while the calcium hydroxide is generated; the Si and Al rich excitation material is dissolved in an alkaline solution (potassium hydroxide solution) to produce free silica and alumina tetrahedral units. (2) In the migration and solidification/gelation process of the material, aluminum oxide and silicon hydroxyl undergo condensation reaction to form a gel phase of the inorganic alkali-activated gel material. At this stage, water is drained from the structure due to hydrolysis. (3) With the hardening of the gel phase, the gel phase is coagulated into a three-dimensional network structure of aluminosilicate, thereby generating the full solid waste low-carbon polymer.
In the invention, the reaction equation in the solid-liquid two-stage excitation process is as follows:
；/>；
；
；
the method comprises the steps of carrying out a first treatment on the surface of the Mainly, mainly
The components are as followsAnd->Crystal and method for producing the sameA system.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
In examples and comparative examples, al in gangue 2 O 3 The content is 48wt%, siO 2 55wt% of the catalyst and 14wt% of loss on ignition; al in coal gasification ash 2 O 3 The content is 15wt percent, siO 2 45wt% of the catalyst and 19wt% of loss on ignition; al in Si-Ca slag 2 O 3 The content is 11wt percent, siO 2 The content is 28wt percent, and the loss on ignition is 8wt percent; al in waste red bricks 2 O 3 The content is 15wt percent, siO 2 The content is 63wt% and the loss on ignition is 4wt%; al in red mud 2 O 3 The content is 11wt percent, siO 2 The content is 57wt% and the loss on ignition is 10wt%; al in aluminum ash 2 O 3 The content of SiO was 62wt% 2 The content is 15wt%, and no loss on ignition is caused.
The calcium oxide content in the white mud was 82wt% and the pH of the white mud was 13.
The potassium hydroxide is granular, an analytically pure reagent, purchased from Tianjin Yongda chemical reagent Co., ltd, and the water is tap water.
Example 1
The preparation raw materials of the two-stage alkali-activated full-solid waste low-carbon polymer comprise an activating material, white mud, potassium hydroxide and water; the exciting material comprises the following components in mass ratio 20:15:20:15:15:5:5, coal gangue, coal gasification ash, calcium silicate slag, waste red bricks, red mud, nickel slag and aluminum ash, wherein the mass of white mud is 5% of the mass of the excitation material; the mass of potassium hydroxide is 10% of the mass of the excitation material; the water-gel ratio was 0.32. The excitation material is sieved by a 325-mesh sieve, and the white mud is sieved by a 200-mesh sieve.
Weighing water according to a water-gel ratio of 0.32, uniformly mixing the water with potassium hydroxide, and standing to obtain a potassium hydroxide solution. Mixing the excitation material and white mud, then placing the mixture into a muffle furnace, solidifying the mixture at 800 ℃ for one section of excitation for 2 hours, and then drying and standing the mixture to obtain one section of excitation material; mixing the first-stage excitation material with potassium hydroxide solution, stirring for 3min at the speed of 65r/min by using a stirring pot, and performing solid-liquid two-stage excitation to obtain the two-stage alkali-excited full-solid waste low-carbon polymer.
Example 2
The excitation material in example 1 was prepared from the following materials in mass ratio 20:15:20:15:15:5:5, coal gangue, coal gasification ash slag, calcium silicate slag, waste red brick, red mud, nickel slag and aluminum ash, wherein the mass of white mud is 5% of the mass of the excitation material, and the excitation material is prepared from the following components in mass ratio 15:16:17:13:15:7:7, coal gangue, coal gasification ash, calcium silicate slag, waste red brick, red mud, nickel slag and aluminum ash, wherein the mass of white mud is 10% of the mass of the excitation material, and the other conditions are the same as in example 1.
Example 3
The excitation material in example 1 was prepared from the following materials in mass ratio 20:15:20:15:15:5:5, coal gangue, coal gasification ash slag, calcium silicate slag, waste red brick, red mud, nickel slag and aluminum ash, wherein the mass of white mud is 5% of the mass of the excitation material, and the excitation material is prepared from the following components in percentage by mass: 18:20:12:12:6:7, coal gangue, coal gasification ash, calcium silicate slag, waste red brick, red mud, nickel slag and aluminum ash, wherein the mass of white mud is 15% of the mass of the excitation material, and the other conditions are the same as in example 1.
Example 4
The water-gel ratio of 0.32 in example 1 was changed from the one-stage excitation at 800℃for 2 hours to 0.30, and the one-stage excitation at 830℃for 1.5 hours, under the same conditions as in example 1.
Example 5
The same conditions as in example 1 were employed except that the water-gel ratio of 0.32 in example 1 was changed from the one-stage excitation at 800℃for 2 hours to the one-stage excitation at 780℃for 2.5 hours.
Comparative example 1
The white mud of example 1 was omitted and the excitation material of example 1 was prepared from the following materials in mass ratio 20:15:20:15:15:5:5, coal gangue, coal gasification ash slag, calcium silicate slag, waste red brick, red mud, nickel slag and aluminum ash, wherein the water-cement ratio is changed into 0.32, and the excitation material consists of the following components in percentage by mass: 20:20:15:15:5:5, coal gangue, coal gasification ash slag, calcium silicate slag, waste red brick, red mud, nickel slag and aluminum ash, wherein the water-cement ratio is 0.30, and other conditions are the same as in example 1.
Comparative example 2
The white mud of example 1 was omitted and the excitation material of example 1 was prepared from the following materials in mass ratio 20:15:20:15:15:5:5, coal gangue, coal gasification ash slag, calcium silicate slag, waste red brick, red mud, nickel slag and aluminum ash are changed into excitation materials with the mass ratio of 20:20:20:15:15:5:5, coal gangue, coal gasification ash, calcium silicate slag, waste red brick, red mud, nickel slag and aluminum ash, and other conditions are the same as in example 1.
Comparative example 3
The white mud of example 1 was omitted and the excitation material of example 1 was prepared from the following materials in mass ratio 20:15:20:15:15:5:5, coal gangue, coal gasification ash slag, calcium silicate slag, waste red brick, red mud, nickel slag and aluminum ash, wherein the water-cement ratio is changed into 0.32, and the excitation material consists of the following components in percentage by mass: 20:20:15:15:5:5, coal gangue, coal gasification ash slag, calcium silicate slag, waste red brick, red mud, nickel slag and aluminum ash, wherein the water-cement ratio is 0.34, and other conditions are the same as in example 1.
Pouring the alkali-activated total solid waste low-carbon polymers of examples 1-5 and comparative examples 1-3 into a container of 40X 160mm 3 In the steel mold (B), the steel mold was vibrated (vibration frequency: 2860 times/min, amplitude: 0.5 mm) on a vibrating table to discharge bubbles and solidifyAfter that, the mold was removed, and the solidified low-carbon polymer was put into a constant temperature curing oven (temperature: 20.+ -. 2 ℃ C., humidity: 95.+ -. 5%) and cured to the corresponding age (1 d, 3d, 7d, 14d, 28d, 90 d), and the compressive strength and hydration degree of the test specimens at the different ages were measured, and the test results are shown in tables 1 and 2.
TABLE 1 compressive Strength of different samples at different ages
TABLE 2 hydration levels of different samples at different ages
From tables 1 and 2, it can be seen that, according to examples 1 to 3, as the white mud content increases, the mechanical properties of the fully solid waste low-carbon polymer show a decreasing trend, the 90d hydration degree shows a trend of rising first and then falling, and when the white mud doping amount is 10% of the excitation material mass, the mechanical properties and the hydration effect of the fully solid waste low-carbon polymer are better.
As can be seen from examples 4-5, the temperature of solid-solid excitation is too high or too low, the water-gel ratio is too high or too low, the mechanical properties are reduced, and the optimal calcination temperature is determined to be 800 ℃, and the optimal water-gel ratio is determined to be 0.32.
As can be seen from comparative example 2 and example 2, the excitation is directly performed by using the potassium hydroxide alkaline solution without mixing with white mud, the overall mechanical property and hydration degree are not as good as those of the primary excitation of white mud and the secondary excitation of alkali solution, and the superiority of the secondary excitation is proved.
As can be seen from comparative examples 1-3, when white mud is not mixed, the compressive strength and 90d hydration performance of the all-solid waste low-carbon polymer are better when the water-cement ratio is 0.32, and as the amount of potassium hydroxide is fixed, the alkalinity of the solution can be obtained to be too strong or too weak, and the mechanical property and the hydration performance of the all-solid waste low-carbon polymer can be reduced.
As can be seen from examples 1 to 3, during curingAfter 28 days, the compressive strength of the two-stage alkali-activated full-solid waste low-carbon polymer reaches more than 42.5MPa, thereby achievingThe full solid waste low carbon polymer can replace the traditional cement.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (8)
1. The preparation raw materials of the two-stage alkali-activated full-solid waste low-carbon polymer comprise an activating material, white mud, potassium hydroxide and water;
the mass of the white mud is 5-15% of the mass of the excitation material; the mass of the potassium hydroxide is 5-12% of the mass of the excitation material.
2. The two-stage alkali-activated total solid waste low-carbon polymer according to claim 1, wherein the water-gel ratio is 0.30-0.34.
3. The two-stage alkali-activated total solid waste low-carbon polymer according to claim 1 or 2, wherein the activated material comprises coal gangue, coal gasification ash, silicon calcium slag, waste red bricks, red mud, nickel slag and aluminum ash, and the mass ratio of the coal gangue to the coal gasification ash to the silicon calcium slag to the waste red bricks to the red mud to the nickel slag to the aluminum ash is 10-20: 15-20: 15-25: 12-20: 12-20: 5-10: 5-10.
4. The two-stage alkali-activated total solid waste low carbon polymer of claim 3, wherein the particle size of the activating material is less than or equal to 45 μm and the particle size of the white mud is less than or equal to 75 μm.
5. The two-stage alkali-activated total solid waste low carbon polymer of claim 3, wherein the calcium oxide content in the white mud is not less than 80wt%, and the pH value of the white mud is not less than 12.
6. The method for preparing the two-stage alkali-activated total solid waste low-carbon polymer according to any one of claims 1 to 5, which is characterized by comprising the following steps:
1) Mixing the excitation material and white mud to carry out solid fixation for one section of excitation to obtain one section of excitation material;
2) And mixing the first-stage excitation material, potassium hydroxide and water to perform solid-liquid two-stage excitation to obtain the two-stage alkali-excited full-solid waste low-carbon polymer.
7. The method for preparing the two-stage alkali-activated total solid waste low-carbon polymer according to claim 6, wherein the solid-solid one-stage activation temperature is 780-830 ℃.
8. The method for preparing the two-stage alkali-activated total solid waste low-carbon polymer according to claim 6 or 7, wherein the time for solid-solid one-stage activation is 1.5-2.5 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311531369.0A CN117263547B (en) | 2023-11-17 | 2023-11-17 | Two-stage alkali-excited full-solid waste low-carbon polymer and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311531369.0A CN117263547B (en) | 2023-11-17 | 2023-11-17 | Two-stage alkali-excited full-solid waste low-carbon polymer and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117263547A true CN117263547A (en) | 2023-12-22 |
| CN117263547B CN117263547B (en) | 2024-02-13 |
Family
ID=89216263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311531369.0A Active CN117263547B (en) | 2023-11-17 | 2023-11-17 | Two-stage alkali-excited full-solid waste low-carbon polymer and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117263547B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000008904A (en) * | 1998-07-18 | 2000-02-15 | 황용길 | Production method of calciumaluminosulfate(cas)-based expanding agent |
| KR101276095B1 (en) * | 2012-09-18 | 2013-06-18 | (주)에프씨코리아랜드 | Inorganic composite for soil pavement, construction method of soil pavement using the composite |
| CN103342492A (en) * | 2013-06-26 | 2013-10-09 | 绵阳西南科大瑞方科技有限公司 | Method for preparing building material admixture by use of bamboo pulp papermaking causticization white mud |
| CN111434749A (en) * | 2019-01-11 | 2020-07-21 | 厦门大学 | Near-ultraviolet excited warm white light fluorescent powder and preparation method and application thereof |
| CN116675472A (en) * | 2023-05-30 | 2023-09-01 | 内蒙古工业大学 | Method for preparing geopolymer by composite excitation of carbide slag and white mud solid waste |
-
2023
- 2023-11-17 CN CN202311531369.0A patent/CN117263547B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000008904A (en) * | 1998-07-18 | 2000-02-15 | 황용길 | Production method of calciumaluminosulfate(cas)-based expanding agent |
| KR101276095B1 (en) * | 2012-09-18 | 2013-06-18 | (주)에프씨코리아랜드 | Inorganic composite for soil pavement, construction method of soil pavement using the composite |
| CN103342492A (en) * | 2013-06-26 | 2013-10-09 | 绵阳西南科大瑞方科技有限公司 | Method for preparing building material admixture by use of bamboo pulp papermaking causticization white mud |
| CN111434749A (en) * | 2019-01-11 | 2020-07-21 | 厦门大学 | Near-ultraviolet excited warm white light fluorescent powder and preparation method and application thereof |
| CN116675472A (en) * | 2023-05-30 | 2023-09-01 | 内蒙古工业大学 | Method for preparing geopolymer by composite excitation of carbide slag and white mud solid waste |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117263547B (en) | 2024-02-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112125541B (en) | Method for activating waste concrete regenerated micro powder through wet carbonization and application of regenerated micro powder | |
| CN112266264B (en) | Aerated concrete based on synergistic effect of alkali excitation and accelerated carbonization and preparation method thereof | |
| US10800704B2 (en) | Fly ash-based geopolymer concrete and method of formation | |
| CN113548841B (en) | Composite geopolymer mortar grouting material for reinforcing pavement base and preparation method thereof | |
| CN113277790B (en) | Slag-based highway grouting material and preparation method thereof | |
| CN114988791B (en) | Flue grouting material doped with sulfur-rich lithium slag, and preparation method and application thereof | |
| CN113045228A (en) | Steel slag-based alkali-activated cementing material, preparation method and application thereof | |
| CN111333393A (en) | Water glass excited nickel slag-domestic garbage incinerator slag-fly ash high-strength environment-friendly brick and preparation method thereof | |
| CN113603402B (en) | Method for preparing anti-carbonization concrete by using waste slurry of mixing plant | |
| CN110357462A (en) | A kind of slag based dried powder ground polymers and preparation method and application | |
| CN117263547B (en) | Two-stage alkali-excited full-solid waste low-carbon polymer and preparation method thereof | |
| CN108264249B (en) | Ferronickel slag-slag low-hydration-heat cementing material and preparation method thereof | |
| CN114213080B (en) | Recycled concrete | |
| CN115849824A (en) | Carbon fixation of electric furnace nickel slag carbon and high-value utilization method thereof in concrete | |
| CN115432982A (en) | Preparation method of novel aerated concrete | |
| CN113735545A (en) | Concrete product containing phosphogypsum fly ash cement and preparation method thereof | |
| JP2012240852A (en) | Method for producing geopolymer cured body having controlled coagulation start time | |
| CN112341053A (en) | High-ductility geopolymer and preparation method thereof | |
| CN116514431B (en) | Anti-cracking and anti-permeability agent for concrete and preparation method thereof | |
| CN117401913B (en) | High-strength low-calcium cement suitable for carbonization maintenance and preparation method thereof | |
| CN113979679B (en) | Self-repairing polymer-based permeable crystallization waterproof material and preparation method thereof | |
| CN116854497A (en) | Cementing material for absorbing carbon dioxide and preparation method thereof | |
| CN117069395A (en) | Carbon-fixing composite cementing material and preparation method and application thereof | |
| Wu et al. | Effect of curing conditions on the alkali-activated blends: Microstructure, performance and economic assessment | |
| WO2024089406A1 (en) | Alkali-activated material |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |