CN105601135A - Method for preparing geopolymer materials from red mud and coal ash - Google Patents
Method for preparing geopolymer materials from red mud and coal ash Download PDFInfo
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- CN105601135A CN105601135A CN201610017921.8A CN201610017921A CN105601135A CN 105601135 A CN105601135 A CN 105601135A CN 201610017921 A CN201610017921 A CN 201610017921A CN 105601135 A CN105601135 A CN 105601135A
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- red mud
- flyash
- mass ratio
- sodium hydroxide
- hydroxide solution
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Classifications
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- 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
Abstract
The invention discloses a method for preparing geopolymer materials from red mud and coal ash. The red mud and the coal ash are used as main base raw materials, and sodium hydroxide solution is used as an alkali-activator, so that the red mud and coal ash geopolymer gel materials can be prepared. The method includes mixing the red mud and the coal ash with each other according to different mass percentages to obtain geopolymers; respectively adding the NaOH solution with different concentrations into the geopolymers; oxidizing the geopolymer and the NaOH solution under different curing conditions of curing rooms and laboratories to obtain the geopolymer materials with different strength grades. The method has the advantages that the method is simple, the geopolymer materials prepared by the aid of the method can be widely applied to numerous fields of manufacture of building materials, roadbed fillers, pile materials and the like, the problem of environmental pollution due to existing red mud can be solved, waste can be turned into wealth, and positive promoting effects for comprehensively utilizing the red mud and the coal ash can be realized.
Description
Technical field
The present invention relates to a kind of method of preparing inorganic non-metallic polymeric material, particularly a kind of red mud and coal ash for manufacturing of utilizing, for the method for geology polymer material, belongs to waste ' s reclamation and building materials preparing technical field.
Background technology
The waste residue of discharging when red mud is aluminium industry extraction aluminium oxide, is strong alkaline substance environment to contaminative, and depositing easy a large amount of dust and the haze of forming in process, to environment. According to measuring and calculating, approximately 7,000 ten thousand tons of the annual red muds producing in the whole world, the annual red mud producing of China has more than 3,000 ten thousand tons. A large amount of red muds relies on large-area stockyard to store up, and has taken a large amount of soils, also environment is caused to severe contamination. The production on the mankind of the generation of red mud, life cause many-sided impact, and therefore, realization by all kinds of means, recycling is extremely urgent on a large scale. Flyash, is to receive and catch the particle getting off in the flue gas from coal combustion, is the main solid waste that coal-burning power plant discharges, and in recent years, is utilized in fields such as many premixing commerical ready-mixed concretes, Construction of Civil Engineering, subgrade constructions. But it only can be applied as auxiliary material, along with social development transition, following its consumption in civil engineering can present decline trend, will form a large amount of accumulations and affects environment. Application how to expand flyash also will become one of important directions of construction material research future development. Through retrieval related documents, to red mud, flyash, a large amount of experimental research work has all been carried out in the utilization in every profession and trade both at home and abroad, and obtains good application prospect, but due to technology, economic aspect, the technology putting into practice is also few.
Summary of the invention
The object of this invention is to provide a kind of red mud and coal ash for manufacturing method for geology polymer material of utilizing, using red mud as a kind of raw mineral materials, form a kind of novel geology polymer material with the flyash that is all industrial solid castoff, can be used as construction material and be applied in Practical Project.
For achieving the above object, technological thought of the present invention is: performance red mud is as the strong basicity high dispersive slag characteristic taking aluminium silicate salt as main component, it has hydraulic gelling property having under alkali-activator effect, and the heat of hydration is low, be beneficial to the formation of red mud mineral geo-polymer Binder Materials under reaction condition. In flyash, contain a large amount of SiO2、Al2O3There is the particle of pozzolanic activity with vitreum etc., and there is very large specific surface energy, low-density, high osmosis and low compressibility, these become its advantage of preparing high strength mineral polymer. Utilize alkali and the aluminate of high-load in red mud, and glassy phase silicate in flyash, thereby then make it depolymerization and polycondensation occur form the geology polymer material of the network jelling structure with higher-strength by the further alkali excitation of NaOH solution. By changing reaction condition, adjust the kind of exciting agent, obtain the polymer of varying strength, become the Novel geological polymeric material with excellent engineering character.
Concrete, a kind of red mud and coal ash for manufacturing of utilizing of the present invention, for the method for geology polymer material, comprises the following steps:
(1) by red mud, flyash natural air drying, to water content mass content 30%～35%, cross 0.3mm～0.6mm round-hole mesh, pack respectively, protection against the tide, for subsequent use;
(2) preparation sodium hydroxide solution, for subsequent use;
(3) weigh respectively red mud and flyash by quality proportioning, first red mud mixed with flyash and stir, add again aqueous slkali or water to stir 5～10 minutes, in mortar mixer, mix thoroughly, then pour in the cement mortar resistance to compression die trial that scribbles releasing agent, smash evenly, be put in and on shake table, be vibrated to mortar surface pulp, and strike off;
(4) die trial is kept flat to 24～28 hours, the demoulding, normal temperature (20 DEG C～25 DEG C) or 65 DEG C ± 2 DEG C, in fog room, maintenance is to design age;
(5) test specimen in the different length of times is carried out to intensity test.
Method of the present invention, as preferred version, in mass ratio, red mud: after F level flyash=1:1 mixes, then add the nanometer SiO of red mud and flyash gross mass 2%2Mix, by liquid-solid mass ratio, i.e. aqueous slkali: (red mud+flyash+nanometer SiO2)=0.6, by sodium hydroxide solution and red mud, flyash, nanometer SiO2Mixture mixes, and wherein, sodium hydroxide solution mass fraction is 10%.
Method of the present invention, as preferred version, in mass ratio, be red mud: C level flyash=1:1 mixes, by liquid-solid mass ratio, the mass ratio of aqueous slkali and red mud, mixture of fly ash is 0.5, and sodium hydroxide solution is mixed with the mixture of red mud, flyash, wherein, sodium hydroxide solution mass fraction is 3.5%.
Method of the present invention, as preferred version, in mass ratio, be red mud: F level flyash=2:8 mixes, by liquid-solid mass ratio, the mass ratio of aqueous slkali and red mud, mixture of fly ash is 0.5, and sodium hydroxide solution is mixed with the mixture of red mud, flyash, wherein, sodium hydroxide solution mass fraction is 10%.
Method of the present invention, as preferred version, in mass ratio, i.e. red mud: F level flyash=2:8 mixes, by liquid-solid mass ratio, is 0.25 to mix by water and the mass ratio of red mud, mixture of fly ash.
The beneficial effect that the present invention obtains is: preparation method of the present invention is simple, prepared geology polymer material can be widely used in construction material manufacture, roadbed filling, the various fields such as material of body of a pile, both solved the pollution problem of red mud for environment, the characteristic that also makes full use of red mud turns waste into wealth, and seeks the new way of " treatment of wastes with processes of wastes against one another; turn waste into wealth ", and the comprehensive utilization of red mud and flyash is played to positive impetus.
Detailed description of the invention
Following examples are used for illustrating the present invention.
Embodiment 1
Raw material mix proportion scheme is as table 1:
Table 1
Required raw material red mud, flyash, at aeration-drying place natural air drying, are not more than to 35% to moisture content, air-dry rear 0.3mm～0.6mm round-hole mesh of crossing, pack respectively, moistureproof for subsequent use; The sodium hydroxide solution that preparation mass percent concentration is 10% is for subsequent use.
Red mud and F level flyash are weighed respectively to red mud, flyash in the ratio of 1:1, with liquid-solid ratio, be that aqueous slkali is 0.6 weighing sodium hydroxide solution with the ratio of red mud, mixture of fly ash, first red mud and flyash are stirred, pouring sodium hydroxide solution into stirs 5～10 minutes again, in mortar mixer, mix uniform, the red mud stirring, coal ash pulp are poured in the cement mortar resistance to compression die trial that scribbles releasing agent, even with steel tamper ramming, be put in and on shake table, be vibrated to mortar surface pulp, and strike off. Die trial is kept flat to the demoulding in 24 hours, be placed in (65 DEG C of temperature, humidity 100%) maintenance in laboratory. Press the strain rate of 0.3mm/min, test compression strength in the different length of time respectively, test result is in table 1.
Embodiment 2
Raw material mix proportion scheme is as table 2:
Table 2
Required raw material red mud, flyash, at aeration-drying place natural air drying, are not more than to 35% to moisture content,, air-dry rear 0.3mm～0.6mm round-hole mesh of crossing, pack respectively, moistureproof for subsequent use. The sodium hydroxide solution that preparation mass percent concentration is 3.5% is for subsequent use. Weighing respectively red mud, C level flyash by the mass ratio of 1:1, is 0.5 weighing sodium hydroxide solution by liquid-solid ratio.
First red mud and flyash are stirred, then pour sodium hydroxide solution into and stir 5～10 minutes, in mortar mixer, mix uniform. The red mud mixing uniform, coal ash pulp are poured in the cement mortar resistance to compression die trial that scribbles releasing agent, even with steel tamper ramming, be put in and on shake table, be vibrated to mortar surface pulp, and strike off. Die trial is kept flat to the demoulding in 24 hours, be placed in (22 DEG C ± 2 DEG C of temperature) maintenance in laboratory. Press the strain rate of 0.3mm/min, test respectively the compression strength of test specimen in 3 days, 14 days, the 28 day length of time. Test result is in table 2.
Embodiment 3
Raw material mix proportion scheme is as table 3
Table 3
Required raw material red mud, flyash are not more than to 35% in aeration-drying place natural air drying to water content, air-dry rear 0.3mm～0.6mm round-hole mesh of crossing, pack respectively, moistureproof for subsequent use. Weigh respectively red mud and F level flyash by the mass ratio of 2:8, weigh clear water with liquid-solid ratio 0.25.
First red mud and flyash are stirred, stir 5～10 minutes, in mortar mixer, mix uniform. The red mud mixing uniform, coal ash pulp are poured in the cement mortar resistance to compression die trial that scribbles releasing agent, even with steel tamper ramming, be put in and on shake table, be vibrated to mortar surface pulp, and strike off. Die trial is kept flat to the demoulding in 24 hours, be placed in (65 DEG C, 100% humidity) maintenance in fog room. Press the strain rate of 0.3mm/min, test respectively the compression strength of test specimen in 3 days, 14 days, the 28 day length of time. Test result is in table 3.
Embodiment 4
Raw material mix proportion scheme table 4
Table 4
Required raw material red mud, flyash are not more than to 35% in aeration-drying place natural air drying to water content, air-dry rear 0.3mm～0.6mm round-hole mesh of crossing, pack respectively, moistureproof for subsequent use. The sodium hydroxide solution that preparation mass percent concentration is 10% is for subsequent use. Weigh respectively red mud and F level flyash by the mass ratio of 2:8, weigh sodium hydroxide solution with liquid-solid ratio 0.5.
First red mud and flyash are stirred, then pour water into and stir 5～10 minutes, in mortar mixer, mix uniform. The red mud mixing uniform, coal ash pulp are poured in the cement mortar resistance to compression die trial that scribbles releasing agent, even with steel tamper ramming, be put in and on shake table, be vibrated to mortar surface pulp, and strike off. Die trial is kept flat to the demoulding in 24 hours, be placed in (65 DEG C, 100% humidity) maintenance in fog room. Press the strain rate of 0.3mm/min, test respectively the compression strength of test specimen in 3 days, 14 days, the 28 day length of time. Test result is in table 4.
Claims (5)
1. utilize red mud and the coal ash for manufacturing method for geology polymer material, it is characterized in that comprising the following steps:
(1) by red mud, flyash natural air drying, to water content mass content 30%～35%, cross 0.3mm～0.6mm round-hole mesh, pack respectively, protection against the tide, for subsequent use;
(2) preparation sodium hydroxide solution, for subsequent use;
(3) weigh respectively red mud and flyash by quality proportioning, first red mud mixed with flyash and stir, add again aqueous slkali or water to stir 5～10 minutes, in mortar mixer, mix thoroughly, then pour in the cement mortar resistance to compression die trial that scribbles releasing agent, smash evenly, be put in and on shake table, be vibrated to mortar surface pulp, and strike off;
(4) die trial is kept flat to 24～28 hours, the demoulding, at 20 DEG C～25 DEG C or 65 DEG C ± 2 DEG C, in fog room, maintenance is to design age;
(5) test specimen in the different length of times is carried out to intensity test.
2. method according to claim 1, is characterized in that step (3), in mass ratio, and red mud: F level flyash=1:1 adds the nanometer SiO of red mud and flyash gross mass 2% again after mixing2Mix, by liquid-solid mass ratio, aqueous slkali: (red mud+flyash+nanometer SiO2)=0.6, by sodium hydroxide solution and red mud, flyash, nanometer SiO2Mixture mixes, and wherein, sodium hydroxide solution mass fraction is 10%.
3. method according to claim 1, it is characterized in that step (3), in mass ratio, red mud: press liquid-solid mass ratio after C level flyash=1:1 mixes, the mass ratio of aqueous slkali and red mud, mixture of fly ash is 0.5, sodium hydroxide solution is mixed with red mud, flyash, and wherein, sodium hydroxide solution mass fraction is 3.5%.
4. method according to claim 1, it is characterized in that step (3), in mass ratio, red mud: press liquid-solid mass ratio after F level flyash=2:8 mixes, the mass ratio of aqueous slkali and red mud, mixture of fly ash is 0.5, sodium hydroxide solution is mixed with red mud, flyash, and wherein, sodium hydroxide solution mass fraction is 10%.
5. method according to claim 1, is characterized in that step (3), in mass ratio, and red mud: by liquid-solid mass ratio, be 0.25 to mix by water and the mixture quality ratio of red mud, flyash after F level flyash=2:8 mixes.
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Cited By (9)
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| CN108249788A (en) * | 2017-12-21 | 2018-07-06 | 中国建筑材料科学研究总院有限公司 | Alkali-activated carbonatite cementitious material and preparation method thereof |
| CN108455887A (en) * | 2018-03-13 | 2018-08-28 | 山东大学 | The method for preparing solid waste base geological polymer using bored slag method collaboration red mud |
| CN108677932A (en) * | 2018-05-29 | 2018-10-19 | 河北建设勘察研究院有限公司 | A kind of construction method of the heatable red-mud coal ash geo-polymer stake of pile body |
| CN108755664A (en) * | 2018-05-29 | 2018-11-06 | 河北建设勘察研究院有限公司 | A kind of the pile body heating device and heating means of the stake of red-mud coal ash geo-polymer |
| US10407343B2 (en) * | 2017-06-02 | 2019-09-10 | University Of Tennessee Research Foundation | Method of producing geopolymer cement utilizing desulfurized red mud |
| CN110776267A (en) * | 2019-11-06 | 2020-02-11 | 中冶南方都市环保工程技术股份有限公司 | Inorganic cementing material prepared from Bayer process red mud and preparation method thereof |
| CN113416025A (en) * | 2021-04-29 | 2021-09-21 | 浙江天地环保科技股份有限公司 | Fast-hardening high-strength fly ash geopolymer material and preparation method thereof |
| CN115196895A (en) * | 2022-06-23 | 2022-10-18 | 北京交通大学 | Red mud and C-type fly ash geopolymer and preparation method thereof |
| CN116891354A (en) * | 2023-08-08 | 2023-10-17 | 中冀建勘集团有限公司 | Quick-setting red mud and fly ash geopolymer grouting material and preparation method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10407343B2 (en) * | 2017-06-02 | 2019-09-10 | University Of Tennessee Research Foundation | Method of producing geopolymer cement utilizing desulfurized red mud |
| CN108249788A (en) * | 2017-12-21 | 2018-07-06 | 中国建筑材料科学研究总院有限公司 | Alkali-activated carbonatite cementitious material and preparation method thereof |
| CN108455887A (en) * | 2018-03-13 | 2018-08-28 | 山东大学 | The method for preparing solid waste base geological polymer using bored slag method collaboration red mud |
| CN108677932A (en) * | 2018-05-29 | 2018-10-19 | 河北建设勘察研究院有限公司 | A kind of construction method of the heatable red-mud coal ash geo-polymer stake of pile body |
| CN108755664A (en) * | 2018-05-29 | 2018-11-06 | 河北建设勘察研究院有限公司 | A kind of the pile body heating device and heating means of the stake of red-mud coal ash geo-polymer |
| CN108755664B (en) * | 2018-05-29 | 2020-09-01 | 河北建设勘察研究院有限公司 | Pile body heating device and heating method for red mud fly ash geopolymer pile |
| CN108677932B (en) * | 2018-05-29 | 2020-09-01 | 河北建设勘察研究院有限公司 | Construction method of red mud coal ash geopolymer pile with pile body capable of being heated |
| CN110776267A (en) * | 2019-11-06 | 2020-02-11 | 中冶南方都市环保工程技术股份有限公司 | Inorganic cementing material prepared from Bayer process red mud and preparation method thereof |
| CN113416025A (en) * | 2021-04-29 | 2021-09-21 | 浙江天地环保科技股份有限公司 | Fast-hardening high-strength fly ash geopolymer material and preparation method thereof |
| CN115196895A (en) * | 2022-06-23 | 2022-10-18 | 北京交通大学 | Red mud and C-type fly ash geopolymer and preparation method thereof |
| CN116891354A (en) * | 2023-08-08 | 2023-10-17 | 中冀建勘集团有限公司 | Quick-setting red mud and fly ash geopolymer grouting material and preparation method thereof |
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