A slag stone powder phosphogypsum solid waste-based alkali-activated cementitious material and a preparation method thereof

Abstract

The application discloses a kind of slag stone powder phosphogypsum solid waste base alkali excitation cementing material and preparation method thereof, belong to solid waste resource utilization technical field.It is composed of the following weight parts raw materials: slag 54-66 parts, stone powder 27-43 parts, phosphogypsum 3-7 parts, alkali excitation agent 2-8 parts, lithium metaaluminate 0.5-1.5 parts, water 40-55 parts, basic amino acid modified silica gel material 1-3 parts, organic phosphine modified hydroxyapatite 1-3 parts and dodecyl dimethyl betaine 1-3 parts.The basic amino acid modified silica gel material, organic phosphine modified hydroxyapatite and dodecyl dimethyl betaine introduced in the application are synergized by the three compound, which can improve the compressive strength and reduce the wear loss, and finally obtain the solid waste base cementing material with excellent mechanical properties, wear resistance and durability.

Description

Technical Field

[0001] This invention relates to the field of solid waste resource utilization technology, and more specifically, to a slag, stone powder, phosphogypsum solid waste-based alkali-activated cementitious material and its preparation method. Background Technology

[0002] Traditional silicate cement, as the main cementing material in the construction field, supports the development of engineering construction with its strong versatility. However, its inherent shortcomings are becoming increasingly prominent: high energy consumption in the production process, large carbon emissions (approximately 0.8 tons of CO2 are emitted for every ton of cement produced), and high resource consumption. Furthermore, its important properties such as fatigue resistance and erosion resistance are difficult to fully meet the long-term service requirements of heavy-duty highways.

[0004] Currently, while existing alkali-activated cementitious materials technologies have taken steps to explore the use of industrial solid waste to replace traditional cement, they generally suffer from the following defects: First, the solid waste proportioning design is unreasonable, such as failing to fully utilize the dominant active role of slag, the sulfate activation effect of phosphogypsum, and the particle size optimization function of stone powder, resulting in poor material strength stability and significant performance fluctuations; Second, the synergistic control effect of key alkali activation parameters (alkali equivalent, modulus) and water-cement ratio is unclear, making it difficult to simultaneously consider material strength and construction practicality; Third, the product strength indicators (especially compressive strength) cannot consistently meet the requirements of specifications such as the "Technical Specifications for Construction of Highway Pavement Base Course" (JTG / T F20-2015) and the "Test Method for Strength of Cement Mortar" (GB / T 17671-2021), limiting their large-scale application in engineering projects. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a slag, stone powder, phosphogypsum solid waste-based alkali-activated cementitious material and its preparation method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A slag, stone powder, phosphogypsum solid waste-based alkali-activated cementitious material, composed of the following raw materials in parts by weight:

[0008] The ingredients are: 54-66 parts slag, 27-43 parts stone powder, 3-7 parts phosphogypsum, 2-8 parts alkali activator, 0.5-1.5 parts lithium aluminate, 40-55 parts water, 1-3 parts alkaline amino acid modified silica gel material, 1-3 parts organophosphorus modified hydroxyapatite, and 1-3 parts dodecyl dimethyl betaine.

[0009] Further, the preparation method of the basic amino acid modified silica gel material is as follows: silica gel is added to hydrochloric acid and heated under reflux to obtain activated silica gel; the activated silica gel is added to anhydrous toluene and stirred under nitrogen protection, 3-aminopropyltriethoxysilane and pyridine are added, and the mixture is heated under reflux to obtain aminated silica gel; the aminated silica gel is added to 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and ultrapure water, CBZ-lysine and N-hydroxysuccinimide are added and stirred to react to obtain CBZ-lysine-coupled silica gel material; the CBZ-lysine-coupled silica gel material is added to methanol, palladium on carbon and ammonium formate are added, and the mixture is stirred to react to obtain the basic amino acid modified silica gel material.

[0010] Furthermore, the ratio of silica gel to hydrochloric acid is (3-5) g : (80-120) mL, and the concentration of hydrochloric acid is 9-11 mol / L.

[0011] Furthermore, the ratio of activated silica gel, anhydrous toluene, 3-aminopropyltriethoxysilane and pyridine is (3-5) g: (40-60) mL: (5-7) mL: (0.1-0.2) mL.

[0012] Furthermore, the ratio of amino-modified silica gel, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, ultrapure water, CBZ-lysine, and N-hydroxysuccinimide is (3-5) g: (6-8) mg: (8-12) mL: (10-14) mg: (14-18) mg; the ratio of CBZ-lysine-coupled silica gel material, methanol, palladium on carbon, and ammonium formate is (0.4-0.6) g: (18-22) mL: (70-80) mg: (140-160) mg; and the mass fraction of palladium on carbon is 8-12%.

[0013] Furthermore, the preparation method of organophosphorus modified hydroxyapatite is as follows: prepare calcium chloride solution, mix diethylenetriaminepentimidephosphonic acid solution with diammonium hydrogen phosphate and dissolve in water to obtain modifier solution, add modifier solution to calcium chloride solution, adjust the pH value of solution to 9-10 with concentrated ammonia water, stir reaction to obtain modified hydroxyapatite product.

[0014] Furthermore, the ratio of calcium chloride dihydrate to water in the calcium chloride solution is (5-7) g: (190-210) mL, the mass fraction of the diethylenetriamine pentamethylphosphonic acid solution is 40-60%, and the ratio of the diethylenetriamine pentamethylphosphonic acid solution, diammonium hydrogen phosphate, and water is (0.1-0.2) g: (3-4) g: (100-300) mL.

[0015] A method for preparing an alkali-activated cementitious material based on slag, stone powder, and phosphogypsum solid waste involves mixing slag, stone powder, and phosphogypsum, adding alkaline amino acid-modified silica gel, dodecyl dimethyl betaine, and organophosphorus-modified hydroxyapatite, and stirring until homogeneous to obtain dry industrial solid waste cementitious material; adding an alkali activator to the dry industrial solid waste cementitious material, adding lithium aluminate and water, and stirring to obtain the solid waste-based alkali-activated cementitious material.

[0016] Furthermore, the alkaline activator is prepared by mixing sodium hydroxide and sodium silicate solution in a mass ratio of 1:1.

[0017] Furthermore, the mass ratio of water to solid sodium silicate in the sodium silicate solution is 8:1.

[0018] In summary, the present invention has the following beneficial effects:

[0019] The alkaline amino acid-modified silica gel material, organophosphorus-modified hydroxyapatite, and dodecyl dimethyl betaine introduced in this invention, when combined synergistically, can improve compressive strength and reduce wear loss, ultimately producing a solid waste-based cementitious material with excellent mechanical properties and wear resistance. Attached Figure Description

[0020] Figure 1 These are actual images of the slag used in Examples 1-4;

[0021] Figure 2 The images show actual photos of the stone powder used in Examples 1-4.

[0022] Figure 3 These are actual images of the phosphogypsum used in Examples 1-4;

[0023] Figure 4 These are photographs of the sodium hydroxide particles used in Examples 1-4.

[0024] Figure 5 These are physical images of the sodium silicate solutions used in Examples 1-4;

[0025] Figure 6 The figure shows the 3-day compressive strength test results of the solid waste-based alkali-activated cementitious material prepared in Example 1;

[0026] Figure 7 The figure shows the 3-day compressive strength test results of the solid waste-based alkali-activated cementitious material prepared in Example 2;

[0027] Figure 8 The figure shows the 3-day compressive strength test results of the solid waste-based alkali-activated cementitious material prepared in Example 3;

[0028] Figure 9The figure shows the 3-day compressive strength test results of the solid waste-based alkali-activated cementitious material prepared in Example 4;

[0029] Figure 10 The image shows a scanning electron microscope (SEM) image of the solid waste-based alkali-activated cementitious material prepared in Example 1. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The slag powder phosphogypsum solid waste-based alkaline activated cementitious material of the present invention is composed of the following raw materials in parts by weight:

[0032] The ingredients are: 54-66 parts slag, 27-43 parts stone powder, 3-7 parts phosphogypsum, 2-8 parts alkali activator, 0.5-1.5 parts lithium aluminate, 40-55 parts water, 1-3 parts alkaline amino acid modified silica gel material, 1-3 parts organophosphorus modified hydroxyapatite, and 1-3 parts dodecyl dimethyl betaine.

[0033] The preparation method of basic amino acid modified silica gel material is as follows: Silica gel is added to hydrochloric acid and heated under reflux to obtain activated silica gel; the activated silica gel is added to anhydrous toluene and stirred under nitrogen protection, then 3-aminopropyltriethoxysilane and pyridine are added, and the mixture is heated under reflux to obtain aminated silica gel; the aminated silica gel is added to 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and ultrapure water, stirred, then CBZ-lysine and N-hydroxysuccinimide are added and stirred to obtain CBZ-lysine-coupled silica gel material; the CBZ-lysine-coupled silica gel material is added to methanol, then palladium on carbon and ammonium formate are added and stirred to obtain basic amino acid modified silica gel material. The ratio of silica gel to hydrochloric acid is (3-5) g:(80-120) mL, and the concentration of hydrochloric acid is 9- The ratio of activated silica gel, anhydrous toluene, 3-aminopropyltriethoxysilane and pyridine to 11 mol / L is (3-5) g: (40-60) mL: (5-7) mL: (0.1-0.2) mL. The ratio of amino-modified silica gel, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, ultrapure water, CBZ-lysine and N-hydroxysuccinimide is (3-5) g: (6-8) mg: (8-12) mL: (10-14) mg: (14-18) mg. The ratio of CBZ-lysine-coupled silica gel material, methanol, palladium on carbon and ammonium formate is (0.4-0.6) g: (18-22) mL: (70-80) mg: (140-160) mg. The mass fraction of palladium on carbon is 8-12%.

[0034] The preparation method of organophosphorus modified hydroxyapatite is as follows: Calcium chloride dihydrate is dissolved in water to obtain a calcium chloride solution. Diethylenetriamine pentamethylphosphonic acid solution is mixed with diammonium hydrogen phosphate and then dissolved in water to obtain a modifier solution. The mass fraction of the diethylenetriamine pentamethylphosphonic acid solution is 40-60%. The modifier solution is added dropwise to the calcium chloride solution, and the pH value of the solution is adjusted to 9-10 with concentrated ammonia. The reaction is stirred, centrifuged, and washed to obtain the modified hydroxyapatite product. The phosphorus content of the modifier diethylenetriamine pentamethylphosphonic acid accounts for 2-3% of the total phosphorus content. The ratio of calcium chloride dihydrate to water is (5-7) g: (190-210) mL. The ratio of the diethylenetriamine pentamethylphosphonic acid solution, diammonium hydrogen phosphate, and water is (0.1-0.2) g: (3-4) g: (100-300) mL.

[0035] The present invention relates to a method for preparing alkali-activated cementitious materials based on slag, stone powder, phosphogypsum solid waste:

[0036] 54-66 parts of slag, 27-43 parts of stone powder and 3-7 parts of phosphogypsum were sieved separately and then added together and stirred. 1-3 parts of alkaline amino acid modified silica gel material, 1-3 parts of dodecyl dimethyl betaine and 1-3 parts of organophosphorus modified hydroxyapatite were added and stirred evenly to obtain dry industrial solid waste cementitious material.

[0037] Mix 2-8 parts of alkali activator evenly and add it to the dry industrial solid waste cementitious material. Add 0.5-1.5 parts of lithium aluminate and 40-55 parts of water, and stir until a uniform, fine, lump-free, and flowable solid waste-based alkali-activated cementitious material is formed. The alkali activator is a compound of sodium hydroxide and sodium silicate solution in a mass ratio of 1:1. The mass ratio of water to solid sodium silicate in the sodium silicate solution is 8:1.

[0038] Example 1

[0039] A slag, stone powder, phosphogypsum solid waste-based alkali-activated cementitious material is composed of the following raw materials in parts by weight:

[0040] 64 parts of slag (provided by Henan Yixiang New Building Materials Technology Co., Ltd.), 33 parts of stone powder (provided by Shaoxing Zhongya Industrial Park Co., Ltd.), 3 parts of phosphogypsum (provided by Zhucheng Jiuqi Building Materials Co., Ltd.), 2 parts of alkali activator, 1 part of lithium aluminate, 40 parts of water, 2 parts of alkaline amino acid modified silica gel material, 2 parts of organophosphorus modified hydroxyapatite, and 2 parts of dodecyl dimethyl betaine.

[0041] A method for preparing an alkaline-activated cementitious material based on slag, stone powder, phosphogypsum solid waste:

[0042] 64 parts of slag, 33 parts of stone powder and 3 parts of phosphogypsum were sieved separately. After sieving, they were added together to a mixer and stirred for 5 minutes. Then, 2 parts of alkaline amino acid modified silica gel material, 2 parts of dodecyl dimethyl betaine and 2 parts of organophosphorus modified hydroxyapatite were added and stirred for a while to obtain dry industrial solid waste cementitious material.

[0043] Sodium hydroxide and sodium silicate solution (the mass ratio of sodium hydroxide to sodium silicate solution is 1:1, the sodium silicate solution is made by stirring water and sodium silicate evenly, and the mass ratio of water to sodium silicate in the sodium silicate solution is 8:1) are used as alkali activators. After mixing 2 parts of alkali activator evenly, it is slowly added to the dry industrial solid waste cementitious material. 1 part of lithium aluminate and 40 parts of water are added, and the mixture is stirred at low speed for 10 minutes until a uniform, fine, lump-free slurry with suitable flowability is formed.

[0044] The prepared slurry is quickly poured into a mold (40mm×40mm×160mm) that has been pre-coated with a release agent. The air bubbles trapped inside the slurry are thoroughly removed by vibration to ensure that the sample is compact.

[0045] The mold containing the slurry was completely sealed with plastic film to prevent moisture evaporation. It was left to stand at room temperature (20±2℃) for 24 hours. After the sample had initially hardened and formed, it was demolded.

[0046] The demolded samples were immediately placed in a standard curing chamber, and the curing conditions were 20±2℃ and relative humidity ≥95%. The curing was continued until the preset test age of 3 days and 28 days to obtain solid waste-based alkali-activated cementitious materials.

[0047] The preparation method of basic amino acid modified silica gel material is as follows: Silica gel is added to hydrochloric acid at a ratio of 4g:100mL, and the concentration of hydrochloric acid is 10mol / L. The mixture is refluxed at 90℃ for 12h, vacuum filtered, washed until neutral, and dried at 100℃ for 8h to obtain activated silica gel. The activated silica gel is then added to anhydrous toluene and stirred under nitrogen protection. 3-Aminopropyltriethoxysilane is added dropwise, followed by pyridine. The mixture is refluxed at 100℃ for 24h, filtered, washed, and dried to obtain aminated silica gel. The ratio of activated silica gel, anhydrous toluene, 3-aminopropyltriethoxysilane, and pyridine is 4g:50mL:6mL:0.15mL. The aminated silica gel is then added to 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and ultrapure water. The mixture was stirred, and CBZ-lysine and N-hydroxysuccinimide were added. The mixture was stirred at 54°C for 12 hours, washed, and dried to obtain CBZ-lysine-coupled silica gel material. The CBZ-lysine-coupled silica gel material was added to methanol, and palladium on carbon and ammonium formate were added. The mixture was heated under reflux at 50°C for 2 hours, filtered, washed, and dried to finally obtain basic amino acid-modified silica gel material. The ratio of amino-modified silica gel, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, ultrapure water, CBZ-lysine, and N-hydroxysuccinimide was 4 g:7 mg:10 mL:12 mg:16 mg. The ratio of CBZ-lysine-coupled silica gel material, methanol, palladium on carbon, and ammonium formate was 0.5 g:20 mL:75 mg:150 mg. The mass fraction of palladium on carbon was 10%.

[0048] Preparation method of organophosphorus modified hydroxyapatite: Calcium chloride dihydrate is dissolved in water to obtain a calcium chloride solution. The ratio of calcium chloride dihydrate to water is 6.8478 g: 200 mL. A solution of diethylenetriaminepentimide phosphonic acid (DIPA) is mixed with diammonium hydrogen phosphate (DAP) and dissolved in water to obtain a modifier solution. The ratio of DIPA, DAP, and water is 0.1602 g: 3.5972 g: 150 mL. The mass fraction of DIPA is 50%. The modifier solution is added dropwise to the calcium chloride solution, and the pH is adjusted to 9.5 with concentrated ammonia. After the addition is complete, the mixture is stirred at room temperature for 2 hours, allowed to stand for 24 hours, centrifuged, washed with water, washed with alcohol, washed again with water, dried at 60℃, ground, and sieved to obtain the modified hydroxyapatite product. The phosphorus content of the modifier DIPA accounts for 2.5% of the total phosphorus content.

[0049] Example 2

[0050] The preparation was carried out according to Example 1, except that in the formulation of the solid waste-based alkali-activated gelling material, the alkali activator was changed to 4 parts and the water was changed to 45 parts.

[0051] Example 3

[0052] The preparation was carried out according to Example 1, except that in the formulation of the solid waste-based alkali-activated gelling material, the alkali activator was changed to 6 parts and the water was changed to 50 parts.

[0053] Example 4

[0054] The preparation was carried out according to Example 1, except that in the formulation of the solid waste-based alkali-activated gelling material, the alkali activator was changed to 8 parts and the water was changed to 55 parts.

[0055] Example 5

[0056] The preparation was carried out according to Example 1, except that in the formulation of the solid waste-based alkali-activated cementitious material, slag was changed to 54 parts, stone powder to 43 parts, and water to 50 parts.

[0057] Example 6

[0058] The preparation was carried out according to Example 1, except that in the formula of the solid waste-based alkali-activated cementitious material, slag was changed to 54 parts, stone powder to 43 parts, alkali activator to 4 parts, and water to 55 parts.

[0059] Example 7

[0060] The preparation was carried out according to Example 1, except that in the formulation of the solid waste-based alkali-activated cementitious material, slag was changed to 54 parts, stone powder to 43 parts, and alkali activator to 6 parts.

[0061] Example 8

[0062] The preparation was carried out according to Example 1, except that in the formula of the solid waste-based alkali-activated cementitious material, the slag was changed to 54 parts, the stone powder to 43 parts, the alkali activator to 8 parts, and the water to 45 parts.

[0063] Example 9

[0064] The preparation was carried out according to Example 1, except that in the formula of the solid waste-based alkali-activated cementitious material, the slag was changed to 66 parts, the stone powder to 27 parts, the phosphogypsum to 7 parts, and the water to 55 parts.

[0065] Example 10

[0066] The preparation was carried out according to Example 1, except that in the formula of the solid waste-based alkali-activated cementitious material, the slag was changed to 66 parts, the stone powder to 27 parts, the phosphogypsum to 7 parts, the alkali activator to 4 parts, and the water to 50 parts.

[0067] Example 11

[0068] The preparation was carried out according to Example 1, except that in the formula of the solid waste-based alkali-activated cementitious material, the slag was changed to 66 parts, the stone powder to 27 parts, the phosphogypsum to 7 parts, the alkali activator to 6 parts, and the water to 45 parts.

[0069] Example 12

[0070] The preparation was carried out according to Example 1, except that in the formula of the solid waste-based alkali-activated cementitious material, the slag was changed to 66 parts, the stone powder to 27 parts, the phosphogypsum to 7 parts, and the alkali activator to 8 parts.

[0071] Example 13

[0072] The preparation was carried out according to Example 1, except that in the formula of the solid waste-based alkali-activated cementitious material, the slag was changed to 56 parts, the stone powder to 37 parts, the phosphogypsum to 7 parts, and the water to 45 parts.

[0073] Example 14

[0074] The preparation was carried out according to Example 1, except that in the formula of the solid waste-based alkali-activated cementitious material, the slag was changed to 56 parts, the stone powder to 37 parts, the phosphogypsum to 7 parts, and the alkali activator to 4 parts.

[0075] Example 15

[0076] The preparation was carried out according to Example 1, except that in the formula of the solid waste-based alkali-activated cementitious material, the slag was changed to 56 parts, the stone powder to 37 parts, the phosphogypsum to 7 parts, the alkali activator to 6 parts, and the water to 55 parts.

[0077] Example 16

[0078] The preparation was carried out according to Example 1, except that in the formula of the solid waste-based alkali-activated cementitious material, the slag was changed to 56 parts, the stone powder to 37 parts, the phosphogypsum to 7 parts, the alkali activator to 8 parts, and the water to 50 parts.

[0079] Comparative Example 1

[0080] The preparation was carried out according to Example 12, except that alkaline amino acid-modified silica gel material was not added to the formulation of the solid waste-based alkaline activated gelling material.

[0081] Comparative Example 2

[0082] The preparation was carried out according to Example 12, except that organophosphorus-modified hydroxyapatite was not added to the formulation of the solid waste-based base activated cementitious material.

[0083] Comparative Example 3

[0084] The preparation was carried out according to Example 12, except that dodecyl dimethyl betaine was not added to the formulation of the solid waste-based base activated gelling material.

[0085] Table 1 shows the compressive strength test results of the solid waste-based alkali-activated cementitious materials prepared in Examples 1-16 and Comparative Examples 1-3 after 3 days and 28 days.

[0086] Table 1

[0087]

[0088] Table 2 shows the experimental results of wear loss of solid waste-based alkali-activated cementitious materials prepared in Example 12 and Comparative Examples 1-3.

[0089] Table 2

[0090]

[0091] The compressive strength was tested according to GB / T 17671-2021 "Test Method for Strength of Cement Mortar".

[0092] The wear resistance loss was tested according to GB / T 16925-1997 "Test Method for Abrasion Resistance of Concrete and its Products (Ball Bearing Method)".

[0093] Figures 1-5 The images show actual samples of slag, stone powder, phosphogypsum, sodium hydroxide particles, and sodium silicate solution used in Examples 1-4. Figure 1 This is a picture of actual slag. Figure 2 This is a picture of actual stone powder. Figure 3 This is a picture of actual phosphogypsum. Figure 4 This is a picture of actual sodium hydroxide particles. Figure 5(Image of sodium silicate solution) Figures 6-9 Figure 1 shows the 3-day compressive strength test results of the solid waste-based alkali-activated cementitious materials prepared in Examples 1-4. Figure 6 This corresponds to Example 1. Figure 7 This corresponds to Example 2. Figure 8 This corresponds to Example 3. Figure 9 (Corresponding to Example 4) Figure 10 The image shows a scanning electron microscope (SEM) image of the slag-stone powder-phosphogypsum solid waste-based alkali-activated cementitious material prepared in Example 1.

[0094] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A slag, stone powder, phosphogypsum solid waste-based alkali-activated cementitious material, characterized in that, It is composed of the following raw materials in parts by weight: 54-66 parts slag, 27-43 parts stone powder, 3-7 parts phosphogypsum, 2-8 parts alkali activator, 0.5-1.5 parts lithium aluminate, 40-55 parts water, 1-3 parts alkaline amino acid modified silica gel material, 1-3 parts organophosphorus modified hydroxyapatite, and 1-3 parts dodecyl dimethyl betaine.

2. The slag powder phosphogypsum solid waste-based alkali-activated cementitious material according to claim 1, characterized in that, The preparation method of basic amino acid modified silica gel material is as follows: silica gel is added to hydrochloric acid and heated under reflux to obtain activated silica gel; the activated silica gel is added to anhydrous toluene and stirred under nitrogen protection, 3-aminopropyltriethoxysilane and pyridine are added, and the mixture is heated under reflux to obtain aminated silica gel; the aminated silica gel is added to 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and ultrapure water, CBZ-lysine and N-hydroxysuccinimide are added and stirred to obtain CBZ-lysine-coupled silica gel material; the CBZ-lysine-coupled silica gel material is added to methanol, palladium on carbon and ammonium formate are added, and the mixture is stirred to obtain basic amino acid modified silica gel material.

3. The slag, stone powder, phosphogypsum solid waste-based alkali-activated cementitious material according to claim 2, characterized in that, The ratio of silica gel to hydrochloric acid is (3-5) g: (80-120) mL, and the concentration of hydrochloric acid is 9-11 mol / L.

4. The slag, stone powder, phosphogypsum solid waste-based alkali-activated cementitious material according to claim 2, characterized in that, The ratio of activated silica gel, anhydrous toluene, 3-aminopropyltriethoxysilane and pyridine is (3-5) g: (40-60) mL: (5-7) mL: (0.1-0.2) mL.

5. The slag, stone powder, phosphogypsum solid waste-based alkali-activated cementitious material according to claim 2, characterized in that, The ratio of amino-modified silica gel, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, ultrapure water, CBZ-lysine and N-hydroxysuccinimide is (3-5) g: (6-8) mg: (8-12) mL: (10-14) mg: (14-18) mg. The ratio of CBZ-lysine-coupled silica gel material, methanol, palladium on carbon and ammonium formate is (0.4-0.6) g: (18-22) mL: (70-80) mg: (140-160) mg. The mass fraction of palladium on carbon is 8-12%.

6. The slag, stone powder, phosphogypsum solid waste-based alkali-activated cementitious material according to claim 1, characterized in that, The preparation method of organophosphorus modified hydroxyapatite is as follows: prepare calcium chloride solution, mix diethylenetriamine pentamethylphosphonic acid solution with diammonium hydrogen phosphate and dissolve in water to obtain modifier solution, add modifier solution to calcium chloride solution, adjust the pH value of solution to 9-10 with concentrated ammonia water, stir reaction to obtain modified hydroxyapatite product.

7. The slag, stone powder, phosphogypsum solid waste-based alkali-activated cementitious material according to claim 6, characterized in that, The ratio of calcium chloride dihydrate to water in the calcium chloride solution is (5-7) g: (190-210) mL. The mass fraction of the diethylenetriamine pentamethylphosphonic acid solution is 40-60%. The ratio of the diethylenetriamine pentamethylphosphonic acid solution, diammonium hydrogen phosphate, and water is (0.1-0.2) g: (3-4) g: (100-300) mL.

8. A method for preparing an alkaline-activated cementitious material based on slag powder phosphogypsum solid waste according to claim 1, characterized in that, Slag, stone powder, and phosphogypsum were mixed together, and alkaline amino acid-modified silica gel, dodecyl dimethyl betaine, and organophosphorus-modified hydroxyapatite were added. After stirring evenly, dry industrial solid waste cementitious material was obtained. Alkali activator was added to the dry industrial solid waste cementitious material, along with lithium aluminate and water, and stirred to obtain solid waste-based alkali-activated cementitious material.

9. The preparation method of a slag powder phosphogypsum solid waste-based alkali-activated cementitious material according to claim 8, characterized in that, The alkaline activator is a mixture of sodium hydroxide and sodium silicate solution in a mass ratio of 1:

1.

10. The preparation method of a slag powder phosphogypsum solid waste-based alkali-activated cementitious material according to claim 9, characterized in that, The mass ratio of water to solid sodium silicate in the sodium silicate solution is 8:1.

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