Light-emitting geopolymer with low alkali damage and sunlight energy storage and preparation method of light-emitting geopolymer

Abstract

The invention discloses a light-emitting geopolymer with low alkali damage and sunlight energy storage and a preparation method thereof.The geopolymer is prepared by taking industrial solid waste blast furnace slag and iron tailings as solid powder raw materials, doping green fluorescent powder and reacting through a composite alkali activator composed of alkaline white mud, sodium silicate and alkaline residue cement; the luminescent intensity and compressive strength of the geopolymer can be improved at the same time by utilizing the synergistic effect of the solid powder, the sodium silicate, the alkaline white mud and the alkaline residue cement, and the compound alkali activator can weaken the alkali quenching effect of the luminescent material in an alkali environment, so that the luminescent geopolymer can still keep higher brightness in the alkali environment, and the service life of the luminescent material is prolonged. And the light-emitting cement can be used as a substitute of light-emitting cement, so that the accident occurrence probability of a dark road can be reduced, the cost of raw materials can be greatly reduced, the light-emitting property of the geopolymer can be improved while the compressive strength of the geopolymer is ensured, and the light-emitting cement has economic benefits and environmental friendliness.

Description

Technical Field

[0001] This invention belongs to the fields of comprehensive utilization of solid waste and preparation and application of geopolymers, and specifically relates to a luminescent geopolymer with low alkali damage for solar energy storage and its preparation method. Background Technology

[0002] Iron tailings are solid waste generated after mineral processing. Most iron tailings are directly landfilled or dumped outdoors, leading to environmental pollution and potential safety hazards. Therefore, finding ways to utilize iron tailings has become a hot research topic in the construction industry. Currently, the main method of consuming iron tailings is to use them as substitutes for cement and aggregates. However, excessive CO2 emissions during cement production can lead to a series of environmental problems. Therefore, research on synthesizing geopolymers to replace cement-based concrete has attracted widespread attention from researchers. Geopolymers, as three-dimensional network gel materials formed from alkali-activated aluminosilicate raw materials, are an ideal choice for building materials due to their high early compressive strength, durability, and low carbon footprint. More importantly, geopolymers themselves can serve as excellent matrices for functional materials.

[0003] Traditional fluorescent materials suffer from high costs and poor durability. Meanwhile, the demand for active luminescent signage and energy-saving lighting in nighttime or low-light environments is increasing in the construction and transportation sectors, for example, in safety guidance, road markings, and landscaping. Current mainstream solutions involve coating the substrate with fluorescent paint, but these coatings are prone to wear, aging and peeling, and have short lifespans. Research shows that the dense, amorphous silica-alumina network structure of geopolymers can effectively encapsulate and fix the luminescent central ions, providing them with a stable crystal field environment. This offers the possibility of combining luminescent materials with geopolymer matrices to develop luminescent building materials. However, traditional geopolymer preparation relies on high-concentration alkaline activators, and the strongly alkaline environment easily causes "alkaline damage" to the luminescent lattice, resulting in a sharp decrease or even quenching of luminescence intensity. Therefore, how to reduce the impact of alkaline solutions on phosphors while ensuring successful polymerization and mechanical properties of geopolymers has become a key technical challenge for the application of geopolymers in the luminescent field.

[0004] Therefore, this invention synthesizes a multi-alkali activator composite iron tailings-blast furnace slag-based luminescent geopolymer, evaluates its mechanical properties and luminescence intensity, and studies the synergistic effect between different alkaline solutions on luminescence characteristics and compressive strength. The results of this study may provide inspiration for the development of building materials with excellent luminescent properties. This invention utilizes an alkaline-activated reaction of sodium silicate, alkaline mud, and alkaline slag cement, with blast furnace slag, iron tailings, and green phosphor as raw materials, and leverages the synergistic effect between sodium silicate, alkaline mud, and alkaline slag cement to prepare a geopolymer with high compressive strength and luminescence properties. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing a low-alkali-damage solar energy storage luminescent geopolymer, belonging to the field of geopolymer preparation. This geopolymer material uses blast furnace slag and iron tailings as base materials, and modifies the geopolymer by adding green phosphor. This invention uses a composite alkali activator to synthesize the geopolymer, which has the characteristics of being environmentally friendly and having good luminescent performance. The geopolymer of this invention uses industrial waste blast furnace slag and iron tailings as raw materials, which not only protects the environment and fully utilizes the value of solid waste, but also reduces the production cost of the geopolymer. Adding green phosphor can improve the luminescent performance of the geopolymer. Utilizing the synergistic effect between sodium silicate, alkaline white mud (alkaline waste residue generated during industrial alkali production or alkali treatment), and alkali slag cement, the compressive strength and luminescent performance of the geopolymer can be improved. Using this geopolymer as a substitute for ordinary silicate cement, developing inexpensive and environmentally friendly luminescent building materials has good application prospects.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: A low-alkali-damage solar energy storage luminescent geopolymer, characterized by comprising the following raw materials: Solid powder, green fluorescent powder, composite alkali activator and water; The total mass of the composite alkali activator is 31.5 wt%-55.5 wt% of the total mass of the solid powder, the mass ratio of water to solid powder is 0.1-0.3, and the mass ratio of green phosphor to solid powder is 0.15-0.45. Furthermore, the solid powder is a mixture of iron tailings and blast furnace slag, wherein the mass fraction of iron tailings in the solid powder mixture is 40 wt%-60 wt%, and the mass fraction of blast furnace slag is 40 wt%-60 wt%. The composite alkali activator is a mixture of sodium silicate, alkaline white mud (alkaline waste residue generated during industrial alkali production or alkali treatment), and alkali slag cement. The amount of sodium silicate is 15 wt%-25 wt% of the total solid powder mass; the amount of alkaline white mud is 1.5 wt%-5.5 wt% of the total solid powder mass; and the amount of alkali slag cement is 15 wt%-25 wt% of the total solid powder mass. Furthermore, the iron tailings are ground and screened to reduce the particle size to less than 100 μm, with an Al2O3 content of 30-60 wt% and a SiO2 content of 30-60 wt%. Furthermore, the blast furnace slag is ground and sieved to a particle size of less than 100 μm, with a CaO content of 20-50 wt%. Furthermore, the green phosphor is a long-afterglow green phosphor with a particle size of 55-95 μm.

[0007] This invention also provides a method for preparing a low-alkali-damage solar energy storage luminescent geopolymer, the preparation method comprising the following steps: Step S1: Crush, grind, and sieve the iron tailings and blast furnace slag; Step S2: Weigh the iron tailings and blast furnace slag obtained in step S1 respectively; weigh the green fluorescent powder according to the mass ratio, pour the above raw materials into a container and mix them evenly to obtain mixture A; Step S3: Mix sodium silicate, alkaline white mud, and alkaline slag cement with water according to the mass ratio, stir and let stand to obtain alkali activator B; mix alkali activator B with mixture A evenly, stir and pour into a steel mold, vibrate on a vibrating table to remove air bubbles in the slurry, then seal the mold and cure it in an oven, then take it out of the oven and demold it after curing at room temperature for 4-14 days to obtain a low-alkali damage solar energy storage luminescent geopolymer; Furthermore, in step S1, the iron tailings and blast furnace slag are crushed, ground, and passed through a 200-mesh sieve. Furthermore, in step S3, the stirring time is 4-10 min, the vibration time is 2-10 min, the curing temperature in the oven is 40-80 ℃, and the curing time is 4-6 h.

[0008] Furthermore, the characteristic feature is that the curing temperature in step S3 is 60 ℃ and the curing time is 6 h.

[0009] Furthermore, the curing time in step S3 is 7 days.

[0010] The beneficial effects of this invention are as follows: 1) This invention innovatively uses alkali slag cement, alkaline white mud (alkaline waste residue generated during industrial alkali production or alkali treatment) and sodium silicate as components of the alkali activator. This not only realizes the resource utilization of industrial waste alkali and greatly reduces the cost of raw materials, but also improves the luminescence performance of the geopolymer while ensuring the compressive strength of the geopolymer, thus combining economic benefits and environmental friendliness. 2) This invention uses iron tailings and blast furnace slag as solid powders for preparing geopolymers, employs a composite alkali activator of sodium silicate, alkaline white mud, and alkali slag cement, and adds green phosphor. Utilizing the synergistic effect of the solid powders with sodium silicate, alkaline white mud, and alkali slag cement, the luminescence intensity and compressive strength of the geopolymers can be simultaneously improved. The composite alkali activator can weaken the "alkali quenching" effect of luminescent materials in alkaline environments, allowing the luminescent geopolymers to maintain high brightness even in alkaline environments. Simultaneously, it can improve the compressive strength of the geopolymers. As an alternative to luminescent cement, it can reduce the probability of accidents on dark roads, beautify urban nightscapes, reduce carbon emissions, lower road marking costs, and ensure that the compressive strength of the geopolymers meets standards. Attached Figure Description

[0011] Figure 1 This is a photograph of the low-alkali-damage solar energy storage luminescent geopolymer prepared in Example 1 of the present invention. Figure 2 A photograph of the low-alkali-damage solar energy storage luminescent geopolymer prepared in Example 1 of the invention under 365nm light source illumination. Figure 3 The image shows the XRD pattern of the low-alkali-damage solar energy storage luminescent geopolymer prepared in Example 1 of this invention. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0013] In the embodiments and comparative examples of this invention, the iron tailings, after grinding and screening, has a particle size of 80 μm, with an Al2O3 content of 30 wt% and a SiO2 content of 35 wt%; the blast furnace slag, after grinding and screening, has a particle size of 70 μm, with a CaO content of 25 wt%; and the green phosphor is a long-afterglow green phosphor with a particle size of 60 μm.

[0014] Example 1: The raw materials prepared in this embodiment include solid powder, green fluorescent powder, and alkali activator; the mass fraction of iron tailings in the solid powder is 40 wt%, the mass fraction of blast furnace slag is 60 wt%, and the total mass of green fluorescent powder is 15 wt% of the mass of solid powder; the total mass of the composite alkali activator is 31.5 wt% of the total mass of solid powder, the mass of sodium silicate in the composite alkali activator is 15 wt% of the mass of solid powder, the mass of alkaline white mud is 1.5 wt% of the mass of solid powder, the mass of alkali slag cement is 15 wt% of the mass of solid powder, and the mass ratio of water to solid powder is 0.1.

[0015] During preparation, 24 g of iron tailings, 36 g of blast furnace slag, and 9 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 9 g of sodium silicate, 0.9 g of alkaline white mud (alkaline waste residue generated during industrial alkali production or alkali treatment), and 9 g of alkali slag cement were weighed and added with 6 g of water for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 hours for later use. Powder A and the composite alkali activator were mixed and stirred for 5 minutes, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 hours to form. Then, it was removed from the oven and cured at room temperature for 7 days before demolding.

[0016] After demolding, the geopolymer samples were irradiated with a 365 nm light source for 8 minutes, and the luminescence intensity of the luminescent geopolymers was measured using a Konica Minolta LS-150 luminometer (Japan). See [link to relevant documentation]. Figure 1-2 , Figure 1 This is a photograph of the low-alkali-damage solar energy storage luminescent geopolymer prepared in Example 1 of the present invention. Figure 2 A photograph of the low-alkali-damage solar energy storage luminescent geopolymer prepared in Example 1 of the invention under 365nm light source illumination. Figure 3 The image shows the XRD pattern of the low-alkali-damage solar energy storage luminescent geopolymer prepared in Example 1 of this invention; from Figure 3 It can be seen that as the phosphor content increases, the gel peak of the geopolymer gradually broadens, representing an increase in gel content and compressive strength. When the phosphor content increases to 45%, the amorphous phase peak increases.

[0017] The compressive strength of the prepared geopolymer was tested according to the national standard GB / T 50081-2019 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete". A compressive strength of 30 MPa was considered to meet the standard. The test methods for the remaining embodiments and comparative examples were the same as those in Example 1.

[0018] Example 2: The raw materials for preparation in this embodiment include solid powder, green fluorescent powder, and alkali activator; the mass fraction of iron tailings in the solid powder is 50 wt%, the mass fraction of blast furnace slag is 50 wt%, and the total mass of green fluorescent powder is 30 wt% of the mass of solid powder; the total mass of the composite alkali activator is 43.5 wt% of the total mass of solid powder, the mass of sodium silicate in the composite alkali activator is 20 wt% of the mass of solid powder, the mass of alkaline white mud is 3.5% of the mass of solid powder, the mass of alkali slag cement is 20 wt% of the mass of solid powder, and the mass ratio of water to solid powder is 0.2.

[0019] During preparation, 30 g of iron tailings, 30 g of blast furnace slag, and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 12 g of sodium silicate, 2.1 g of alkaline white mud, and 12 g of alkaline slag cement were weighed and added to disperse 12 g of water. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0020] Example 3: The raw materials for preparation in this embodiment include solid powder, green fluorescent powder, and alkali activator; the mass fraction of iron tailings in the solid powder is 60 wt%, the mass fraction of blast furnace slag is 40 wt%, and the total mass of green fluorescent powder is 45 wt% of the mass of solid powder; the total mass of the composite alkali activator is 55.5 wt% of the total mass of solid powder, the mass of sodium silicate in the composite alkali activator is 25 wt% of the mass of solid powder, the mass of alkaline white mud is 5.5% of the mass of solid powder, the mass of alkali slag cement is 25 wt% of the mass of solid powder, and the mass ratio of water to solid powder is 0.3.

[0021] During preparation, 36 g of iron tailings, 24 g of blast furnace slag, and 27 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 15 g of sodium silicate, 3.3 g of alkaline white mud, and 15 g of alkaline slag cement were weighed and 18 g of water were added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 hours for later use. Powder A and the alkali activator were mixed and stirred for 5 minutes, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 hours to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0022] Comparative Example 1: The raw materials for this comparative example include solid powder, green fluorescent powder, and alkali activator; the mass fraction of iron tailings in the solid powder is 50 wt%, the mass fraction of blast furnace slag is 50 wt%, and the total mass of green fluorescent powder is 30 wt% of the solid powder mass; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of alkaline white mud in the composite alkali activator is 6.48% of the solid powder mass, the mass of alkali slag cement is 37.02 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0023] During preparation, 30 g of iron tailings, 30 g of blast furnace slag, and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 3.89 g of alkaline white mud and 22.21 g of alkaline slag cement were weighed, and 12 g of water was added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 hours for later use. Powder A and the alkali activator were mixed and stirred for 5 minutes, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 hours to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0024] Comparative Example 2: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of iron tailings in the solid powder is 50 wt%, the mass fraction of blast furnace slag is 50 wt%, and the total mass of green phosphor is 30 wt% of the solid powder; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of sodium silicate in the composite alkali activator is 21.75 wt% of the solid powder, the mass of alkali slag cement is 21.75 wt% of the solid powder, and the mass ratio of water to solid powder is 0.2.

[0025] During preparation, 30 g of iron tailings, 30 g of blast furnace slag, and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 13.05 g of sodium silicate and 13.05 g of alkali slag cement were weighed, and 12 g of water was added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 hours for later use. Powder A and the alkali activator were mixed and stirred for 5 minutes, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 hours to form the mold. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0026] Comparative Example 3: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of iron tailings in the solid powder is 50 wt%, the mass fraction of blast furnace slag is 50 wt%, and the total mass of green phosphor is 30 wt% of the solid powder; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of alkaline white mud in the composite alkali activator is 6.48% of the solid powder, the mass of sodium silicate is 37.02 wt% of the solid powder, and the mass ratio of water to solid powder is 0.2.

[0027] During preparation, 30 g of iron tailings, 30 g of blast furnace slag, and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 3.89 g of alkaline white mud and 22.21 g of sodium silicate were weighed, and 12 g of water was added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0028] Comparative Example 4: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of iron tailings in the solid powder is 50 wt%, the mass fraction of blast furnace slag is 50 wt%, the total mass of green phosphor is 30 wt% of the solid powder mass; the total mass of alkali activator is 43.5 wt% of the total mass of solid powder, the mass of alkali slag cement in the alkali activator is 43.5 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0029] During preparation, 30 g of iron tailings, 30 g of blast furnace slag, and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 26.1 g of alkali slag cement was weighed, and 12 g of water was added to disperse it. After stirring evenly, alkali activator was obtained and left to stand for 24 h for later use. Powder A and alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0030] Comparative Example 5: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of iron tailings in the solid powder is 50 wt%, the mass fraction of blast furnace slag is 50 wt%, the total mass of green phosphor is 30 wt% of the solid powder mass; the total mass of alkali activator is 43.5 wt% of the total mass of solid powder, the mass of alkaline white mud in the alkali activator is 43.5 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0031] During preparation, 30 g of iron tailings, 30 g of blast furnace slag, and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 26.1 g of alkaline white mud was weighed, and 12 g of water was added to disperse it. After stirring evenly, an alkali activator was obtained and left to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0032] Comparative Example 6: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of iron tailings in the solid powder is 50 wt%, the mass fraction of blast furnace slag is 50 wt%, the total mass of green phosphor is 30 wt% of the solid powder mass; the total mass of alkali activator is 43.5 wt% of the total mass of solid powder, the mass of sodium silicate in the alkali activator is 43.5 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0033] During preparation, 30 g of iron tailings, 30 g of blast furnace slag, and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 26.1 g of sodium silicate was weighed and 12 g of water was added for dispersion. After stirring evenly, an alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60°C for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0034] Comparative Example 7: The raw materials for this comparative example include solid powder, green fluorescent powder, and alkali activator; the mass fraction of blast furnace slag in the solid powder is 100 wt%, the total mass of green fluorescent powder is 30 wt% of the solid powder mass; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of sodium silicate in the composite alkali activator is 20 wt% of the solid powder mass, the mass of alkaline white mud is 3.5% of the solid powder mass, the mass of alkali slag cement is 20 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0035] During preparation, 60 g of blast furnace slag and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 12 g of sodium silicate, 2.1 g of alkaline white mud and 12 g of alkaline slag cement were weighed and 12 g of water were added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0036] Comparative Example 8: The raw materials for this comparative example include solid powder, green fluorescent powder, and alkali activator; the mass fraction of blast furnace slag in the solid powder is 100 wt%, the total mass of green fluorescent powder is 30 wt% of the solid powder mass; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of alkaline white mud in the composite alkali activator is 6.48% of the solid powder mass, the mass of alkali slag cement is 37.02 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0037] During preparation, 60 g of blast furnace slag and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 3.89 g of alkaline white mud and 22.21 g of alkaline slag cement were weighed, and 12 g of water was added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0038] Comparative Example 9: The raw materials for this comparative example include solid powder, green fluorescent powder, and alkali activator; the mass fraction of blast furnace slag in the solid powder is 100 wt%, the total mass of green fluorescent powder is 30 wt% of the solid powder mass; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of sodium silicate in the composite alkali activator is 21.75 wt% of the solid powder mass, the mass of alkali slag cement is 21.75 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0039] During preparation, 60 g of blast furnace slag and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 13.05 g of sodium silicate and 13.05 g of alkali slag cement were weighed, and 12 g of water was added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0040] Comparative Example 10: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of blast furnace slag in the solid powder is 100 wt%, and the total mass of green phosphor is 30 wt% of the solid powder; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of alkaline white mud in the composite alkali activator is 6.48% of the solid powder, the mass of sodium silicate is 37.02 wt% of the solid powder, and the mass ratio of water to solid powder is 0.2.

[0041] During preparation, 60 g of blast furnace slag and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 3.89 g of alkaline white mud and 22.21 g of sodium silicate were weighed, and 12 g of water was added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0042] Comparative Example 11: The raw materials for this comparative example include solid powder, green fluorescent powder, and alkali activator; the mass fraction of blast furnace slag in the solid powder is 100 wt%, the total mass of green fluorescent powder is 30 wt% of the mass of solid powder; the total mass of alkali activator is 43.5 wt% of the total mass of solid powder, the mass of alkali slag cement in the alkali activator is 43.5 wt% of the mass of solid powder, and the mass ratio of water to solid powder is 0.2.

[0043] During preparation, 60 g of blast furnace slag and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 26.1 g of alkali slag cement was weighed and 12 g of water was added to disperse it. After stirring evenly, alkali activator was obtained and left to stand for 24 h for later use. Powder A and alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0044] Comparative Example 12: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of blast furnace slag in the solid powder is 100 wt%, the total mass of green phosphor is 30 wt% of the solid powder mass; the total mass of alkali activator is 43.5 wt% of the total mass of solid powder, the mass of alkaline white mud in the alkali activator is 43.5 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0045] During preparation, 60 g of blast furnace slag and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 26.1 g of alkaline white mud was weighed and 12 g of water was added for dispersion. After stirring evenly, an alkali activator was obtained and left to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0046] Comparative Example 13: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of blast furnace slag in the solid powder is 100 wt%, the total mass of green phosphor is 30 wt% of the solid powder mass; the total mass of alkali activator is 43.5 wt% of the total mass of solid powder, the mass of sodium silicate in the alkali activator is 43.5 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0047] During preparation, 60 g of blast furnace slag and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 26.1 g of sodium silicate was weighed and 12 g of water was added for dispersion. After stirring evenly, an alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0048] Comparative Example 14: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of iron tailings in the solid powder is 100 wt%, and the total mass of green phosphor is 30 wt% of the solid powder; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of sodium silicate in the composite alkali activator is 20 wt% of the solid powder, the mass of alkaline white mud is 3.5% of the solid powder, the mass of alkali slag cement is 20 wt% of the solid powder, and the mass ratio of water to solid powder is 0.2.

[0049] During preparation, 60 g of iron tailings and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 12 g of sodium silicate, 2.1 g of alkaline white mud and 12 g of alkaline slag cement were weighed and 12 g of water were added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0050] Comparative Example 15: The raw materials for this comparative example include solid powder, green fluorescent powder, and alkali activator; the mass fraction of iron tailings in the solid powder is 100 wt%, and the total mass of green fluorescent powder is 30 wt% of the solid powder mass; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of alkaline white mud in the composite alkali activator is 6.48% of the solid powder mass, the mass of alkali slag cement is 37.02 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0051] During preparation, 60 g of iron tailings and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 3.89 g of alkaline white mud and 22.21 g of alkaline slag cement were weighed, and 12 g of water was added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0052] Comparative Example 16: The raw materials for this comparative example include solid powder, green fluorescent powder, and alkali activator; the mass fraction of iron tailings in the solid powder is 100 wt%, the total mass of green fluorescent powder is 30 wt% of the solid powder mass; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of sodium silicate in the composite alkali activator is 21.75 wt% of the solid powder mass, the mass of alkali slag cement is 21.75 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0053] During preparation, 60 g of iron tailings and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 13.05 g of sodium silicate and 13.05 g of alkali slag cement were weighed, and 12 g of water was added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0054] Comparative Example 17: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of iron tailings in the solid powder is 100 wt%, and the total mass of green phosphor is 30 wt% of the solid powder; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of alkaline white mud in the composite alkali activator is 6.48% of the solid powder, the mass of sodium silicate is 37.02 wt% of the solid powder, and the mass ratio of water to solid powder is 0.2.

[0055] During preparation, 60 g of iron tailings and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 3.89 g of alkaline white mud and 22.21 g of sodium silicate were weighed, and 12 g of water was added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0056] Comparative Example 18: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of iron tailings in the solid powder is 100 wt%, the total mass of green phosphor is 30 wt% of the solid powder mass; the total mass of alkali activator is 43.5 wt% of the total mass of solid powder, the mass of alkali slag cement in the alkali activator is 43.5 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0057] During preparation, 60 g of iron tailings and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 26.1 g of alkali slag cement was weighed and 12 g of water was added to disperse it. After stirring evenly, alkali activator was obtained and left to stand for 24 h for later use. Powder A and alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0058] Comparative Example 19: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of iron tailings in the solid powder is 100 wt%, the total mass of green phosphor is 30 wt% of the solid powder mass; the total mass of alkali activator is 43.5 wt% of the total mass of solid powder, the mass of alkaline white mud in the alkali activator is 43.5 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0059] During preparation, 60 g of iron tailings and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 26.1 g of alkaline white mud was weighed and 12 g of water was added for dispersion. After stirring evenly, an alkali activator was obtained and left to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0060] Comparative Example 20: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of iron tailings in the solid powder is 100 wt%, the total mass of green phosphor is 30 wt% of the solid powder mass; the total mass of alkali activator is 43.5 wt% of the total mass of solid powder, the mass of sodium silicate in the alkali activator is 43.5 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0061] During preparation, 60 g of iron tailings and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 26.1 g of sodium silicate was weighed and 12 g of water was added for dispersion. After stirring evenly, an alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0062] Comparative Example 21: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the mass fraction of metakaolin in the solid powder is 50 wt%, the mass fraction of blast furnace slag is 50 wt%, and the total mass of green phosphor is 30 wt% of the solid powder; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of sodium silicate in the composite alkali activator is 20 wt% of the solid powder, the mass of alkaline white mud is 3.5% of the solid powder, the mass of alkali slag cement is 20 wt% of the solid powder, and the mass ratio of water to solid powder is 0.2.

[0063] During preparation, 30 g of metakaolin, 30 g of blast furnace slag, and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 12 g of sodium silicate, 2.1 g of alkaline white mud, and 12 g of alkaline slag cement were weighed and 12 g of water were added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0064] Comparative Example 22: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the solid powder contains 50 wt% iron tailings, 50 wt% metakaolin, and 30 wt% green phosphor; the composite alkali activator contains 43.5 wt% composite alkali activator, of which sodium silicate accounts for 20 wt% of the solid powder, alkaline white mud accounts for 3.5% of the solid powder, alkali slag cement accounts for 20 wt% of the solid powder, and the water-to-solid powder mass ratio is 0.2.

[0065] During preparation, 30 g of iron tailings, 30 g of metakaolin, and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 12 g of sodium silicate, 2.1 g of alkaline white mud, and 12 g of alkaline slag cement were weighed and added to disperse 12 g of water. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 hours before use. Powder A and the alkali activator were mixed and stirred for 5 minutes, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 hours to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0066] Comparative Example 23: The raw materials for this comparative example include solid powder, green fluorescent powder, and alkali activator; the mass fraction of iron tailings in the solid powder is 50 wt%, the mass fraction of blast furnace slag is 50 wt%, and the total mass of green fluorescent powder is 30 wt% of the solid powder mass; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of sodium sulfate in the composite alkali activator is 20 wt% of the solid powder mass, the mass of alkaline white mud is 3.5% of the solid powder mass, the mass of alkali slag cement is 20 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0067] During preparation, 30 g of iron tailings, 30 g of blast furnace slag, and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 12 g of sodium sulfate, 2.1 g of alkaline white mud, and 12 g of alkaline slag cement were weighed and 12 g of water were added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 hours for later use. Powder A and the alkali activator were mixed and stirred for 5 minutes, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 hours to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0068] Comparative Example 24: The raw materials for this comparative example include solid powder, green fluorescent powder, and alkali activator; the mass fraction of iron tailings in the solid powder is 50 wt%, the mass fraction of blast furnace slag is 50 wt%, and the total mass of green fluorescent powder is 30 wt% of the solid powder mass; the total mass of the composite alkali activator is 43.5 wt% of the total mass of the solid powder, the mass of sodium silicate in the composite alkali activator is 20 wt% of the solid powder mass, the mass of sodium hydroxide is 3.5% of the solid powder mass, the mass of alkali slag cement is 20 wt% of the solid powder mass, and the mass ratio of water to solid powder is 0.2.

[0069] During preparation, 30 g of iron tailings, 30 g of blast furnace slag, and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 12 g of sodium silicate, 2.1 g of sodium hydroxide, and 12 g of alkali slag cement were weighed and 12 g of water were added for dispersion. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 hours for later use. Powder A and the alkali activator were mixed and stirred for 5 minutes, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 hours to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0070] Comparative Example 25: The raw materials for this comparative example include solid powder, green phosphor, and alkali activator; the solid powder contains 50 wt% iron tailings, 50 wt% blast furnace slag, and 30 wt% green phosphor; the composite alkali activator contains 43.5 wt% composite alkali activator, of which sodium silicate accounts for 20 wt% of the solid powder, alkaline white mud accounts for 3.5% of the solid powder, calcium carbide slag accounts for 20 wt% of the solid powder, and the water-to-solid powder mass ratio is 0.2.

[0071] During preparation, 30 g of iron tailings, 30 g of blast furnace slag, and 18 g of green fluorescent powder were weighed and mixed evenly to obtain powder A. 12 g of sodium silicate, 2.1 g of alkaline white mud, and 12 g of carbide slag were weighed and added to disperse in water. After stirring evenly, a composite alkali activator was obtained and allowed to stand for 24 h for later use. Powder A and the alkali activator were mixed and stirred for 5 min, poured into a 30 mm × 30 mm × 30 mm steel mold for casting, and cured in an oven at 60 ℃ for 6 h to form. Then, it was taken out of the oven and cured at room temperature for 7 days before demolding.

[0072] The luminescence intensity and compressive strength of the geopolymers prepared in Examples 1-3 and Comparative Examples 1-25 were tested, and the results are shown in Table 1.

[0073] Table 1. Compressive strength and luminescence intensity of the geopolymers prepared in Examples 1-3 and Comparative Examples 1-25

[0074] As can be seen from the data in Table 1, this invention uses iron tailings and blast furnace slag as solid powders for preparing geopolymers, employs a composite alkali activator of sodium silicate, alkaline white mud, and alkali slag cement, and adds green phosphor. Utilizing the synergistic effect of the solid powders with sodium silicate, alkaline white mud, and alkali slag cement, the luminescence intensity and compressive strength of the geopolymers can be simultaneously improved. The composite alkali activator can weaken the "alkali quenching" effect of luminescent materials in alkaline environments, allowing the luminescent geopolymers to maintain high brightness even in alkaline environments. Simultaneously, it can improve the compressive strength of the geopolymers. As a substitute for luminescent cement, it can reduce the probability of accidents on dark roads while ensuring that the compressive strength of the geopolymers meets the application standards for road concrete.

[0075] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low-alkali-damage luminescent geopolymer for solar energy storage, characterized in that, Including the following raw materials: Solid powder, green fluorescent powder, composite alkali activator and water; The total mass of the composite alkali activator is 31.5 wt%-55.5 wt% of the total mass of the solid powder, the mass ratio of water to solid powder is 0.1-0.3, and the mass ratio of green phosphor to solid powder is 0.15-0.

45.

2. The low-alkali-damage solar energy storage luminescent geopolymer as described in claim 1, characterized in that, The solid powder is a mixture of iron tailings and blast furnace slag, wherein the mass fraction of iron tailings and blast furnace slag in the solid powder mixture is 40 wt%-60 wt%. The composite alkali activator is a mixture of sodium silicate, alkaline white mud, and alkali slag cement. The amount of sodium silicate is 15 wt%-25 wt% of the total mass of solid powder; the amount of alkaline white mud is 1.5 wt%-5.5 wt% of the total mass of solid powder; and the amount of alkali slag cement is 15 wt%-25 wt% of the total mass of solid powder.

3. The low-alkali-damage solar energy storage luminescent geopolymer as described in claim 1, characterized in that, The iron tailings are ground and screened to make their particle size less than 100 μm, with an Al2O3 content of 30-60 wt% and a SiO2 content of 30-60 wt%.

4. The low-alkali-damage solar energy storage luminescent geopolymer as described in claim 1, characterized in that, The blast furnace slag is ground and sieved to a particle size of less than 100 μm, and contains 20-50 wt% CaO.

5. The low-alkali-damage solar energy storage luminescent geopolymer as described in claim 1, characterized in that, The green phosphor is a long-afterglow green phosphor with a particle size of 55-95 μm.

6. The method for preparing a low-alkali-damage solar energy storage luminescent geopolymer as described in claims 1-5, characterized in that, The preparation method includes the following steps: Step S1: Crush, grind, and sieve the iron tailings and blast furnace slag; Step S2: Weigh the iron tailings and blast furnace slag obtained in step S1 respectively; weigh the green fluorescent powder according to the mass ratio, pour the above raw materials into a container and mix them evenly to obtain mixture A; Step S3: Mix sodium silicate, alkaline white mud, and alkaline slag cement with water according to the mass ratio, stir and let stand to obtain alkali activator B; mix alkali activator B with mixture A evenly, stir and pour into a steel mold, vibrate on a vibrating table to remove air bubbles in the slurry, then seal the mold and cure it in an oven. After that, take it out of the oven and demold it after curing at room temperature for 4-14 days to obtain a low-alkali damage solar energy storage luminescent geopolymer.

7. The preparation method according to claim 6, characterized in that, In step S1, the iron tailings and blast furnace slag are crushed, ground, and passed through a 200-mesh sieve.

8. The preparation method according to claim 6, characterized in that, The stirring time in step S3 is 4-10 min, the vibration time is 2-10 min, the curing temperature in the oven is 40-80 ℃, and the curing time is 4-6 h.

9. The preparation method according to claim 8, characterized in that, The curing temperature in step S3 is 60 ℃, and the curing time is 6 h.

10. The preparation method according to claim 8, characterized in that, The curing time in step S3 is 7 days.

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