CN115321887A - Method for preparing light heat-insulating material by utilizing waste incineration fly ash and secondary aluminum ash - Google Patents
Method for preparing light heat-insulating material by utilizing waste incineration fly ash and secondary aluminum ash Download PDFInfo
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Abstract
The invention discloses a method for preparing a light heat-insulating material by utilizing waste incineration fly ash and secondary aluminum ash, which comprises the following steps: 1) Weighing appropriate amount of light-burned magnesium oxide, red mud and waste incineration fly ash respectively, and mixing uniformly to obtain magnesium-doped waste incineration fly ash red mud; 2) Respectively weighing appropriate amount of secondary aluminum ash and magnesium-doped waste incineration fly ash red mud, and uniformly mixing to obtain aluminum ash and magnesium-doped waste incineration fly ash red mud; 3) Respectively weighing proper amounts of expanded perlite particles and aluminum ash magnesium doped waste incineration fly ash red mud, and uniformly mixing to obtain aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite; 4) Weighing a proper amount of cyclodextrin excitant solution and expanded perlite of aluminum ash magnesium doped garbage incineration fly ash red mud, uniformly stirring, introducing into a mold for curing, and demolding to obtain a light heat-insulating material; the cyclodextrin excitant solution is formed by dissolving a proper amount of cyclodextrin and water glass in water, the preparation process is simple, and waste can be utilized to prepare a good light heat-insulating material.
Description
Technical Field
The invention relates to a method for preparing a light heat-insulating material by utilizing waste incineration fly ash and secondary aluminum ash.
Background
The secondary aluminum ash, which contains aluminum nitride and aluminum carbide, has a distinct reactivity characteristic and is listed in the "hazardous waste list" (2021). When the secondary aluminum ash is contacted with water, aluminum nitride and aluminum carbide contained in the secondary aluminum ash can rapidly react with the water, and a large amount of heat and gas are released in a short time, so that the secondary aluminum ash has the potential as a foaming material. However, since the secondary aluminum ash reacts too violently when in contact with water, it generally does not provide good control of the foaming process and the resulting gas has poor stability and even adversely affects the curing process of the cement itself. The main components in the household garbage incineration fly ash are calcium oxide, calcium carbonate, chlorohydroxy calcium, sodium chloride, potassium chloride and the like, which do not have the characteristics of a cementing material, and effective component matching and complementation can not be formed between the household garbage incineration fly ash and aluminum ash. Therefore, the fly ash from waste incineration and the secondary aluminum ash are treated in a synergistic manner, and an obvious technical barrier exists for realizing the synchronous recycling of the fly ash from the waste incineration and the secondary aluminum ash.
The light heat-insulating material has good heat-insulating property, and the product quality depends on the reasonable selection of the foaming agent and the cementing material and the arrangement of the operation process. Therefore, it is urgently needed to develop a method for preparing a light thermal insulation material by using waste incineration fly ash and secondary aluminum ash to realize waste utilization, and simultaneously, the problems that the secondary aluminum ash reacts too violently and releases gas too quickly need to be solved.
Disclosure of Invention
The invention provides a method for preparing a light heat-insulating material by utilizing waste incineration fly ash and secondary aluminum ash, aiming at preparing the light heat-insulating material by utilizing the waste incineration fly ash and the secondary aluminum ash and solving the problems that the secondary aluminum ash reacts too violently when meeting water and releases gas too quickly.
The invention discloses a method for preparing a light heat-insulating material by utilizing waste incineration fly ash and secondary aluminum ash, which comprises the following steps:
1) Respectively weighing light burned magnesia, red mud and waste incineration fly ash according to the mass ratio of 2.5-35, 15-105, and mixing and stirring uniformly to obtain magnesium-doped waste incineration fly ash red mud;
2) Weighing secondary aluminum ash and magnesium-doped waste incineration fly ash red mud according to the mass ratio of 1-15;
3) Respectively weighing expanded perlite particles and the aluminum ash magnesium doped waste incineration fly ash red mud according to the mass ratio of 15-55 to 100, and uniformly mixing and stirring to obtain the aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite;
4) Weighing cyclodextrin excitant solution and aluminum ash magnesium doped garbage incineration fly ash red mud expanded perlite according to the liquid-solid ratio of 0.2-0.4 (mL: g), uniformly stirring, introducing into a mold, maintaining for 7-28 days, and demolding to obtain the light heat-insulating material; the cyclodextrin excitant solution is formed by dissolving cyclodextrin and water glass in water, and the mass ratio of the cyclodextrin to the water glass to the aluminum ash magnesium doped garbage incineration fly ash red mud expanded perlite is (0.1-2).
In the step 1), the mass ratio of the light burned magnesium oxide to the red mud to the waste incineration fly ash is 5-25.
In the step 2), the mass ratio of the secondary aluminum ash to the magnesium-doped waste incineration fly ash red mud is 2.5-12.5.
In the step 4), the mass ratio of the cyclodextrin, the water glass and the aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite is 0.25-1.75.
Has the advantages that: the preparation process is simple, the preparation raw materials are wide and easy to obtain, and the reaction of secondary aluminum ash, light-burned magnesium oxide, red mud and waste incineration fly ash is excited by the cyclodextrin excitant, so that the geopolymer colloid and the cyclodextrin are mixed and meshed together, the effective wrapping of expanded perlite particles and the effective sealing of gas released by the secondary aluminum ash are realized, and a good heat insulation material is formed; the invention provides a visual idea for preparing a novel light heat-insulating material by utilizing waste incineration fly ash and secondary aluminum ash, and realizes the utilization of waste.
Drawings
FIG. 1 is a flow chart of the method for preparing a light heat-insulating material by using waste incineration fly ash and secondary aluminum ash according to the invention.
Detailed Description
The technical solution of the present invention is described in detail by the following examples, but the scope of the present invention is not limited to the examples.
The waste incineration fly ash is obtained from a feed opening of a dust removal bag dust removal module of a waste incineration fly ash flue gas treatment in Zhu and eight-square thermal power plants (Zhejiang Chongchi eight-square thermoelectricity Limited liability company), and is sealed by a waterproof belt to be used as a test sample.
The secondary aluminum ash is obtained from Xinchang aerospace machine tool equipment Limited, is flue ash generated in the aluminum casting process, is sealed by a waterproof belt and is used as a test sample.
The red mud is produced in a combined process production process from a Zibo bauxite alumina refining enterprise, and a red mud sample is dried and then sealed by a waterproof belt to be used as a test sample.
Example 1 influence of the quality ratio of light-burned magnesia, red mud and waste incineration fly ash on the performance of the prepared light-burned thermal insulation material
The following are taken as reference numerals in the following, and the following description is given to a 15.5. And (2) weighing the secondary aluminum ash and the magnesium-doped waste incineration fly ash red mud according to the mass ratio of 2.5. Respectively weighing the expanded perlite particles and the aluminum ash magnesium doped waste incineration fly ash red mud according to the mass ratio of 15 to 100, and uniformly mixing and stirring to obtain the aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite. Weighing a cyclodextrin activator solution and aluminum ash magnesium doped garbage incineration fly ash red mud expanded perlite according to a liquid-solid ratio of 0.2 (mL: g), uniformly stirring, introducing into a mold, maintaining for 7-28 days under a normal temperature environment, and demolding to obtain the light heat-insulating material (the preparation process is shown in figure 1), wherein the cyclodextrin activator solution is prepared by dissolving cyclodextrin and water glass in water, and the mass ratio of the cyclodextrin to the water glass to the aluminum ash magnesium doped garbage incineration fly ash red mud expanded perlite is 0.25. The light-burned magnesium oxide, the cyclodextrin the water glass is all commercial products.
The dry density test and the compressive strength test of the heat-insulating material are carried out according to the test method of inorganic hard heat-insulating products (GB/T5486-2008); the thermal conductivity coefficient of the thermal insulation material is tested according to the thermal insulation material steady-state thermal resistance and related characteristic determination protective hot plate method (GB/T10294). The test results of the quality ratio of the light-burned magnesia, the red mud and the waste incineration fly ash on the performance of the prepared light-burned thermal insulation material are shown in the table 1.
TABLE 1
As can be seen from Table 1, the dry density ranges from 363.77 to 423.82kg/m 3 The thermal conductivity coefficient is 0.048-0.089W/(m.K), and the compressive strength is 1.72-1.98MPa. When the mass ratio of the light-burned magnesia to the red mud to the waste incineration fly ash is too small as being lower than the lowest value in the table 1, the mixing amount of the light-burned magnesia and the red mud is too small, the generated sodium aluminosilicate and calcium aluminosilicate-based geopolymer colloid is too small, and the gas sealing effect generated by secondary aluminum ash is poor, so that the dry density and the heat conductivity coefficient of the prepared light heat insulation material are both greatly increased along with the further reduction of the mass ratio of the light-burned magnesia to the red mud to the waste incineration fly ash, and the performance of the prepared light heat insulation material is poor.
When the mass ratio of the light-burned magnesia to the red mud to the waste incineration fly ash exceeds the highest value in the table 1 and is too high, the light-burned magnesia or the red mud is too much doped, the calcium aluminosilicate-based geopolymer colloid generated in the process of excitation of the cyclodextrin-carried silicate is reduced, and the gas sealing effect is deteriorated, so that the dry density and the heat conductivity coefficient of the prepared light heat insulation material are greatly increased along with the further increase of the mass ratio of the light-burned magnesia to the red mud to the waste incineration fly ash, and the performance of the prepared light heat insulation material is poor.
The mass ratio of the light burned magnesium oxide to the red mud to the waste incineration fly ash is preferably 5-25 to 100, so that after the cyclodextrin excitant solution and the aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite are mixed, secondary aluminum ash, the light burned magnesium oxide, the red mud and the waste incineration fly ash are induced by alkali excitation and a hollow cylinder three-dimensional annular structure in the stirring process through cyclodextrin-carried silicate, sodium aluminosilicate and calcium aluminosilicate-based geopolymer colloid are generated and gathered towards the inner side of a cyclodextrin molecular structure, and therefore the geopolymer colloid and the cyclodextrin are promoted to be mixed and meshed together and the expanded perlite particles are wrapped; generating aluminum hydroxide and releasing ammonia gas when the secondary aluminum ash meets the cyclodextrin excitant solution; the ammonia gas is encapsulated in the geopolymer and cyclodextrin mixed mesh colloid. From the aspects of benefit and cost, when the mass ratio of the light-burned magnesia to the red mud to the waste incineration fly ash is 5-25 to 30-90.
Example 2 quality ratio of Secondary aluminum Ash and magnesium doped waste incineration fly Ash Red mud to the Performance of the prepared lightweight insulation Material
Weighing light-burned magnesia, red mud and waste incineration fly ash according to a mass ratio of 25. The method comprises the following steps of (1). Respectively weighing the expanded perlite particles and the aluminum ash magnesium doped waste incineration fly ash red mud according to the mass ratio of 35. Weighing a cyclodextrin activator solution and aluminum ash magnesium doped garbage incineration fly ash red mud expanded perlite according to a liquid-solid ratio of 0.3 (mL: g), uniformly stirring, introducing into a mold, maintaining for 17.5 days under a normal temperature environment, and demolding to obtain the light heat-insulating material, wherein the cyclodextrin activator solution is prepared by dissolving cyclodextrin and water glass in water, and the mass ratio of the cyclodextrin, the water glass and the aluminum ash magnesium doped garbage incineration fly ash red mud expanded perlite is 1.
The dry density test, the compressive strength test and the thermal conductivity test of the thermal insulation material are the same as those in example 1, and the test results of the mass ratio of the secondary aluminum ash and the magnesium-doped waste incineration fly ash red mud to the performance of the prepared light thermal insulation material are shown in Table 2.
TABLE 2
As can be seen from Table 2, the dry density ranges from 331.98 to 383.19kg/m 3 The thermal conductivity coefficient is 0.037-0.074W/(m.K), and the compressive strength is 1.11-1.94MPa. When the mass ratio of the secondary aluminum ash to the magnesium-doped waste incineration fly ash red mud is less than 1.
When the mass ratio of the secondary aluminum ash to the magnesium-doped waste incineration fly ash red mud is more than 15, the mixing amount of the secondary aluminum ash is too much, and the ammonia gas released by the secondary aluminum ash after encountering a cyclodextrin excitant solution is too much, so that the compression strength of the prepared light heat-insulating material is greatly reduced along with the further increase of the mass ratio of the secondary aluminum ash to the magnesium-doped waste incineration fly ash red mud, and the heat-insulating material is poor.
When the mass ratio of the secondary aluminum ash to the magnesium-doped waste incineration fly ash red mud is preferably 2.5-12.5, in this way, after the cyclodextrin excitant solution and the aluminum ash magnesium-doped waste incineration fly ash red mud expanded perlite are mixed, the secondary aluminum ash, the light burned magnesium oxide, the red mud and the waste incineration fly ash are induced by alkali excitation and a hollow cylinder three-dimensional annular structure in the stirring process through cyclodextrin-carried silicate, sodium aluminosilicate and calcium aluminosilicate-based geopolymer colloid are generated by reaction and are gathered towards the inner side of a cyclodextrin molecular structure, so that the geopolymer colloid and the cyclodextrin are promoted to be mixed and meshed together, and the expanded perlite particles are wrapped; generating aluminum hydroxide and releasing ammonia gas when the secondary aluminum ash meets the cyclodextrin excitant solution; ammonia gas is sealed and fixed in the geopolymer and cyclodextrin mixed mesh colloid; and the aluminum hydroxide participates in the generation process of sodium aluminosilicate and calcium aluminosilicate based geopolymer colloid. Therefore, from the aspects of benefit and cost, when the mass ratio of the secondary aluminum ash to the magnesium-doped waste incineration fly ash red mud is equal to 2.5-12.5.
Example 3 quality ratio of cyclodextrin, water glass, aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite to the prepared lightweight insulation material
Weighing light-burned magnesia, red mud and waste incineration fly ash according to a mass ratio of 25. And (2) weighing the secondary aluminum ash and the magnesium-doped waste incineration fly ash red mud according to the mass ratio of 12.5. Respectively weighing expanded perlite particles and the aluminum ash magnesium doped waste incineration fly ash red mud according to the mass ratio of 55. The mass ratio of the cyclodextrin activator solution to the aluminum ash-doped fly ash-expanded perlite is 0.4 (mL: g), and the mass ratio of the cyclodextrin activator solution to the water glass is 0.25.
The dry density test, the compressive strength test and the thermal conductivity test of the thermal insulation material are the same as those in example 1, and the test results of the mass ratio of the cyclodextrin, the water glass and the aluminum ash magnesium doped waste incineration fly ash and the red mud expanded perlite on the prepared light thermal insulation material are shown in Table 3.
TABLE 3
As can be seen from Table 3, the dry density ranges from 325.73 to 423.44kg/m 3 The thermal conductivity coefficient is 0.032-0.079W/(m.K), and the compressive strength is 1.24-2.26MPa. When the mass ratio of the cyclodextrin to the water glass to the aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite is lower than the lowest value in the table 3 but is too small, the mixing amount of the cyclodextrin to the water glass is too small, the excitation effect of the cyclodextrin carrying silicate alkali is insufficient, so that the dry density and the heat conductivity coefficient of the prepared light heat insulation material are both greatly increased along with the further reduction of the mass ratio of the cyclodextrin to the water glass to the aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite, and the compressive strength of the prepared light heat insulation material is greatly reduced along with the further reduction of the mass ratio of the cyclodextrin to the water glass to the aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite, so that the performance of the heat insulation material is poor.
When the mass ratio of the cyclodextrin, the water glass and the aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite exceeds the highest value in the table 3 and is too large, the cyclodextrin and the water glass are excessive, the generation of the calcium aluminosilicate-based geopolymer colloid is reduced, the dry density and the heat conductivity coefficient of the prepared light heat-insulating material are both greatly increased along with the further increase of the mass ratio of the cyclodextrin, the water glass and the aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite, and the compressive strength is greatly reduced along with the further increase of the mass ratio of the cyclodextrin, the water glass and the aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite, so that the performance of the heat-insulating material is poor.
When the mass ratio of the cyclodextrin, the water glass and the aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite is preferably 0.25-1.75; after the cyclodextrin excitant solution and the aluminum ash magnesium-doped waste incineration fly ash red mud expanded perlite are mixed, in the stirring process, secondary aluminum ash, light-burned magnesium oxide, red mud and waste incineration fly ash are induced to react by cyclodextrin-carried silicate through alkali excitation and a hollow cylinder three-dimensional annular structure to generate sodium aluminosilicate and calcium aluminosilicate-based geopolymer colloid, and the sodium aluminosilicate and the calcium aluminosilicate-based geopolymer colloid are gathered towards the inner side of a cyclodextrin molecular structure, so that the geopolymer colloid and the cyclodextrin are promoted to be mixed and meshed together, and expanded perlite particles are wrapped; the secondary aluminum ash meets the cyclodextrin excitant solution to generate aluminum hydroxide and release ammonia gas; ammonia gas is sealed and fixed in the geopolymer and cyclodextrin mixed mesh colloid; the aluminum hydroxide participates in the generation process of sodium aluminosilicate and calcium aluminosilicate based geopolymer colloid; after the maintenance is finished, the mesh colloid wrapping the gas and the expanded perlite particles is hardened to form a good heat-insulating material. Therefore, from the aspects of benefit and cost, when the mass ratio of the cyclodextrin, the water glass and the aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite is equal to 0.25-1.75.
The above-mentioned techniques not specifically mentioned refer to the prior art.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited to the invention itself. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A method for preparing a light heat-insulating material by utilizing waste incineration fly ash and secondary aluminum ash is characterized by comprising the following steps:
1) Weighing light-burned magnesium oxide, red mud and waste incineration fly ash according to the mass ratio of 2.5-35;
2) Weighing secondary aluminum ash and magnesium-doped waste incineration fly ash red mud according to the mass ratio of 1-15;
3) Respectively weighing expanded perlite particles and the aluminum ash magnesium doped waste incineration fly ash red mud according to the mass ratio of 15-55 to 100, and uniformly mixing and stirring to obtain the aluminum ash magnesium doped waste incineration fly ash red mud expanded perlite;
4) Weighing cyclodextrin excitant solution and aluminum ash magnesium doped garbage incineration fly ash red mud expanded perlite according to the liquid-solid ratio of 0.2-0.4; the cyclodextrin excitant solution is formed by dissolving cyclodextrin and water glass in water, wherein the mass ratio of the cyclodextrin to the water glass to the aluminum ash magnesium doped garbage incineration fly ash red mud expanded perlite is 0.1-2.
2. The method for preparing the light heat-insulating material by using the waste incineration fly ash and the secondary aluminum ash according to claim 1, wherein in the step 1), the mass ratio of the light-burned magnesium oxide to the red mud to the waste incineration fly ash is 5-25.
3. The method for preparing a lightweight thermal insulation material by using waste incineration fly ash and secondary aluminum ash according to claim 1, wherein in the step 2), the mass ratio of the secondary aluminum ash to the magnesium-doped waste incineration fly ash red mud is 2.5-12.5.
4. The method for preparing the light-weight thermal insulation material by using the waste incineration fly ash and the secondary aluminum ash as claimed in claim 1, wherein in the step 4), the mass ratio of the cyclodextrin, the water glass, the aluminum ash and the magnesium doped waste incineration fly ash red mud expanded perlite is 0.25-1.75.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115636648A (en) * | 2022-12-05 | 2023-01-24 | 中国建筑材料科学研究总院有限公司 | Cement-based foamed wave-absorbing heat-insulating concrete and preparation method thereof |
| CN116178033A (en) * | 2023-04-24 | 2023-05-30 | 常熟理工学院 | Method for preparing refractory brick by using aluminum ash and product thereof |
| CN116332616A (en) * | 2023-01-18 | 2023-06-27 | 常熟理工学院 | Method for preparing heat insulation material from waste incineration fly ash and heat insulation material |
| CN116553541A (en) * | 2023-04-27 | 2023-08-08 | 常熟理工学院 | Method for preparing activated carbon and cementing material by cooperatively utilizing waste incineration fly ash and oil sludge |
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| CN116332616B (en) * | 2023-01-18 | 2023-10-27 | 常熟理工学院 | Method for preparing heat insulation material from waste incineration fly ash and heat insulation material |
| CN116178033A (en) * | 2023-04-24 | 2023-05-30 | 常熟理工学院 | Method for preparing refractory brick by using aluminum ash and product thereof |
| CN116178033B (en) * | 2023-04-24 | 2023-07-21 | 常熟理工学院 | Method for preparing refractory brick by using aluminum ash and product thereof |
| CN116553541A (en) * | 2023-04-27 | 2023-08-08 | 常熟理工学院 | Method for preparing activated carbon and cementing material by cooperatively utilizing waste incineration fly ash and oil sludge |
| CN116553541B (en) * | 2023-04-27 | 2024-08-02 | 常熟理工学院 | Method for preparing activated carbon and cementing material by cooperatively utilizing waste incineration fly ash and oil sludge |
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