A diabase tailings geopolymer cementitious material and a method of making the same

Abstract

The application discloses a diabase tailing geopolymer cementing material and a preparation method thereof, and belongs to the technical field of building materials. The diabase tailing geopolymer cementing material provided by the application comprises the following components in mass fractions: 80-120 parts of diabase tailing, 10-20 parts of sodium hydroxide, 80-120 parts of water glass, 10-20 parts of aluminum hydroxide, 1-3 parts of water reducing agent and 2-11 parts of stabilizing material; the material is prepared by using solid waste diabase tailing to prepare a geopolymer cementing material, does not add harmful solvents, heavy metals and radioactive substances, can realize waste-to-resource, and has the advantages of simple preparation process, low cost, small energy consumption and the like, and provides an effective way for comprehensive utilization of diabase tailing.

Description

A geopolymer cementitious material for diabase tailings and its preparation method Technical Field

[0001] This invention belongs to the field of building materials technology, specifically relating to a geopolymer cementitious material for diabase tailings and its preparation method. Background Technology

[0002] Cementitious materials, as fundamental raw materials in the construction industry, have a significant impact on global resource consumption and the environment through their production and use. Traditional silicate cement is the most widely used cementitious material, but its production process consumes large amounts of limestone and clay and requires high-temperature calcination (approximately 1450℃), resulting in high energy consumption and substantial carbon dioxide emissions (approximately 0.8 tons of carbon dioxide are emitted for every ton of cement produced). Furthermore, the brittle nature of cement-based materials limits their application in specialized engineering scenarios. Therefore, developing low-carbon, environmentally friendly, and high-performance alternative cementitious materials has become an urgent need for the industry.

[0003] Geopolymers, as a novel type of inorganic cementitious material, have attracted much attention due to their low carbon emissions, high durability, and excellent mechanical properties. Existing geopolymers mostly use industrial solid wastes such as fly ash and slag as raw materials, forming a three-dimensional network structure through an alkali-activated reaction. However, the sources of these raw materials are limited by the geographical distribution and production fluctuations of specific industrial by-products, and some raw materials (such as fly ash) pose a risk of exceeding radioactive element limits, restricting their large-scale promotion. Furthermore, traditional geopolymer preparation processes often require high-temperature pretreatment or calcination activation of raw materials (e.g., above 600℃), leading to increased energy consumption and high equipment costs. This can also damage the mineral structure of the raw materials, requiring the addition of chemical modifiers to compensate for performance losses, further increasing production costs and process complexity.

[0004] Diabase tailings are solid waste generated during the mining and processing of diabase. Currently, the comprehensive utilization rate of diabase tailings is extremely low, with most being directly stockpiled or landfilled. This not only occupies land resources but also poses a risk of heavy metal leaching and environmental pollution. Existing technologies primarily utilize diabase tailings in low-value-added applications (such as roadbed fillers) or require high-temperature calcination (e.g., above 1200℃) to activate them and enhance their reactivity. However, such processes are energy-intensive, require significant equipment investment, and high-temperature treatment can easily lead to mineral structural instability, necessitating complex formula adjustments or the introduction of expensive additives, making large-scale application difficult.

[0005] Currently, geopolymers mainly rely on industrial byproducts such as fly ash and slag. However, diabase tailings, as a bulk solid waste, have not been effectively used in geopolymer systems. Furthermore, traditional geopolymer raw materials (such as low-activity fly ash, slag, iron / copper metal tailings, and kaolin non-metallic tailings) often require high-temperature calcination pretreatment above 600℃ to enhance reactivity, leading to a surge in energy consumption, high costs, and the potential risk of exceeding radioactive element limits. Low-temperature activation technology for diabase tailings has not yet been reported, and existing high-temperature processes severely restrict their environmental friendliness and economic viability. Moreover, although existing geopolymer materials have high compressive strength, their toughness is generally low (flexural-to-compression ratio is mostly below 0.25), and their flexural strength is difficult to exceed 10MPa, failing to meet the requirements of high-toughness engineering (such as earthquake-resistant structures and crack-resistant pavements). Summary of the Invention

[0006] In view of the above-mentioned prior art, the present invention provides a geopolymer cementitious material for diabase tailings and its preparation method, which solves the problems of high energy consumption and low flexural-to-pressure ratio of the existing technology.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a greenstone tailings geopolymer cementitious material is provided, comprising the following components in parts by weight: 80-120 parts of diabase tailings, 10-20 parts of sodium hydroxide, 80-120 parts of water glass, 10-20 parts of aluminum hydroxide, 1-3 parts of water-reducing agent, and 2-11 parts of stabilizing material.

[0008] The beneficial effects of this invention are as follows: The diabase tailings geopolymer cementitious material provided by this invention utilizes solid waste diabase tailings to prepare the geopolymer cementitious material without adding harmful solvents, heavy metals, or radioactive substances, thus turning waste into treasure and providing an effective way for the comprehensive utilization of diabase tailings; the compressive strength and flexural strength of this diabase tailings geopolymer cementitious material can reach up to 44.93 MPa and 14.77 MPa, respectively, with a flexural-compression ratio of 0.33~0.40, exhibiting significant toughness characteristics; far exceeding traditional cement (flexural-compression ratio ≤0.2) and existing geopolymers (flexural-compression ratio ≤0.25), it combines rigidity and toughness, and can meet the requirements of harsh engineering scenarios such as earthquake resistance and crack resistance. This performance level is not seen in currently published literature and patents.

[0009] This invention is the first to use diabase tailings as a core raw material in a geopolymer system, realizing high-value-added resource utilization of solid waste; moreover, the diabase tailings geopolymer cementitious material does not contain heavy metals, radioactive substances, or harmful solvents, solving the problem of tailings stockpiling pollution from the source and providing a green technology path for diabase mining.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, it includes the following components in parts by weight: 100 parts of diabase tailings, 16 parts of sodium hydroxide, 104 parts of water glass, 16 parts of aluminum hydroxide, 2 parts of water-reducing agent, and 6 parts of stabilizing material.

[0012] Furthermore, the modulus of water glass is 2.23.

[0013] Furthermore, the water-reducing agent is polycarboxylic acid.

[0014] The beneficial effect of adopting a further technical solution is that the optimized composition ratio of the diabase tailings geopolymer cementitious material results in a cementitious material with higher compressive and flexural strength.

[0015] This invention also discloses a method for preparing geopolymer cementitious materials from diabase tailings, comprising the following steps:

[0016] S1: Dry the diabase tailings and activate them at 120~300℃, then grind the activated diabase tailings into diabase tailings powder;

[0017] S2: Sodium hydroxide, water glass, aluminum hydroxide, water-reducing agent and stabilizer are mixed at room temperature and water is added and stirred evenly to obtain an alkali activator;

[0018] S3: Mix diabase tailings powder with alkali activator, and then stir at a speed of 100~120r / min for 5~6min to obtain diabase tailings geopolymer mixture;

[0019] S4: Place the diabase tailings geopolymer mixture into a mold, cure at room temperature for 24 hours, then remove the mold and perform standard curing to obtain the diabase tailings geopolymer cementitious material.

[0020] Further drying involves drying the diabase tailings at 30-45℃ for 3-4 hours.

[0021] Further activation involves placing the diabase tailings at 120-300℃ for 3 hours.

[0022] The beneficial effects of adopting further technical solutions are as follows: This invention creatively adopts a low-temperature activation process of 120~300℃, which reduces energy consumption by more than 60% compared with the traditional calcination above 600℃, and avoids the instability of mineral structure caused by high temperature; after activation, the tailings can efficiently form a three-dimensional network structure under alkali activation, without the need for additional additives to compensate for performance, significantly simplifying the formula and reducing production costs.

[0023] Furthermore, the particle size of the diabase tailings powder is 45~100μm.

[0024] Furthermore, the liquid-to-solid ratio of the diabase tailings geopolymer mixture is 0.35.

[0025] Furthermore, the standard curing temperature is 20±2℃, relative humidity ≥95%, and curing time is 7 days.

[0026] The beneficial effects of this invention are as follows: The preparation method provided by this invention uses low-temperature activation of diabase tailings, which reduces energy consumption and harmful substance emissions compared to the traditional high-temperature calcination method. High temperatures may damage the original mineral structure, requiring adjustments to the formula or the addition of additives, increasing cost and complexity. Furthermore, high-temperature process equipment is expensive, posing a high barrier to large-scale production. This invention, by using low-temperature activation of diabase tailings followed by alkali activation, can form a three-dimensional network structure with high strength and toughness. Moreover, by curing the diabase tailings geopolymer mixture at 20±2℃ and relative humidity ≥95%, the performance of the diabase tailings geopolymer cementitious material is further improved. Therefore, the core advantages of this invention using low-temperature activation of diabase tailings are low energy consumption, low emissions, and low cost, while also possessing environmental safety and material functionality. The preparation method of this invention has a simple process (requiring only drying, low-temperature activation, grinding, mixing, and curing), low equipment requirements, low energy consumption, and no high-temperature or high-pressure steps, making it easy to scale up production. It provides a scalable solution for solid waste resource utilization and the development of low-carbon building materials, and has excellent industrial application prospects. Attached Figure Description

[0027] Figure 1 is a flowchart of the preparation process of geopolymer cementitious materials from diabase tailings. Detailed Implementation

[0028] The specific embodiments of the present invention will be described in detail below with reference to examples.

[0029] Example 1

[0030] A diabase tailings geopolymer cementitious material comprises the following components in parts by weight: 100 parts diabase tailings, 16 parts sodium hydroxide, 104 parts water glass with a modulus of 2.23, 16 parts aluminum hydroxide, 2 parts polycarboxylate, and 6 parts stabilizing material (Haizhisen Co., Ltd. - Cement-based penetrating crystalline waterproof coating).

[0031] The preparation method of the diabase tailings geopolymer cementitious material in this embodiment (as shown in Figure 1) includes the following steps:

[0032] S1: Dry the diabase tailings at 40℃ for 3.5h, then place them at 300℃ for 3h for activation, and then grind the activated diabase tailings into diabase tailings powder with a particle size of 80μm.

[0033] S2: Sodium hydroxide, water glass, aluminum hydroxide, polycarboxylic acid and stabilizing material are mixed in proportion by mass at room temperature and water is added and stirred evenly to obtain an alkali activator;

[0034] S3: Mix diabase tailings powder with alkali activator, and then stir at 120 r / min for 5 min to obtain diabase tailings geopolymer mixture (the liquid-solid ratio of the diabase tailings geopolymer mixture is 0.35).

[0035] S4: Place the diabase tailings geopolymer mixture into a mold and cure at room temperature for 24 hours. Then remove the mold and cure at 20℃ and 95% relative humidity for 7 days to obtain the diabase tailings geopolymer cementitious material.

[0036] Example 2

[0037] A diabase tailings geopolymer cementitious material comprises the following components in parts by weight: 80 parts diabase tailings, 10 parts sodium hydroxide, 80 parts water glass with a modulus of 2.23, 10 parts aluminum hydroxide, 1 part polycarboxylate, and 2 parts stabilizing material (Haizhisen Co., Ltd. - Cement-based penetrating crystalline waterproof coating).

[0038] The preparation method of the diabase tailings geopolymer cementitious material in this embodiment (as shown in Figure 1) includes the following steps:

[0039] S1: Dry the diabase tailings at 30℃ for 4 hours, then place them at 120℃ for 3 hours to activate them, and then grind the activated diabase tailings into diabase tailings powder with a particle size of 100μm.

[0040] S2: Sodium hydroxide, water glass, aluminum hydroxide, polycarboxylic acid and stabilizing material are mixed in proportion by mass at room temperature and water is added and stirred evenly to obtain an alkali activator;

[0041] S3: Mix diabase tailings powder with alkali activator, and then stir at 100 r / min for 6 min to obtain diabase tailings geopolymer mixture (the liquid-solid ratio of the diabase tailings geopolymer mixture is 0.35).

[0042] S4: Place the diabase tailings geopolymer mixture into a mold and cure at room temperature for 24 hours. Then remove the mold and cure at 22℃ and 95% relative humidity for 7 days to obtain the diabase tailings geopolymer cementitious material.

[0043] Example 3

[0044] A diabase tailings geopolymer cementitious material comprises the following components in parts by weight: 120 parts diabase tailings, 20 parts sodium hydroxide, 120 parts water glass with a modulus of 2.23, 20 parts aluminum hydroxide, 3 parts polycarboxylic acid, and 11 parts stabilizing material (Haizhisen Co., Ltd. - Cement-based penetrating crystalline waterproof coating).

[0045] The preparation method of the diabase tailings geopolymer cementitious material in this embodiment (as shown in Figure 1) includes the following steps:

[0046] S1: Dry the diabase tailings at 45℃ for 3 hours, then place them at 200℃ for 3 hours to activate them, and then grind the activated diabase tailings into diabase tailings powder with a particle size of 45μm.

[0047] S2: Sodium hydroxide, water glass, aluminum hydroxide and polycarboxylic acid are mixed in the mass fractions at room temperature and water is added and stirred evenly to obtain an alkali activator;

[0048] S3: Mix diabase tailings powder with alkali activator, and then stir at 120 r / min for 5 min to obtain diabase tailings geopolymer mixture (the liquid-solid ratio of the diabase tailings geopolymer mixture is 0.35).

[0049] S4: Place the diabase tailings geopolymer mixture into a mold and cure at room temperature for 24 hours. Then remove the mold and cure at 18℃ and 95% relative humidity for 7 days to obtain the diabase tailings geopolymer cementitious material.

[0050] Comparative Example 1

[0051] A diabase tailings geopolymer cementitious material comprises the following components in parts by weight: 100 parts diabase tailings, 16 parts sodium hydroxide, 104 parts water glass with a modulus of 2.23, 16 parts aluminum hydroxide, 2 parts polycarboxylate, and 6 parts stabilizing material (Haizhisen Co., Ltd. - Cement-based penetrating crystalline waterproof coating).

[0052] The preparation method of the diabase tailings geopolymer cementitious material in this embodiment includes the following steps:

[0053] S1: Dry the diabase tailings at 40℃ for 3.5h, then place them at room temperature for 3h, and then grind the diabase tailings into diabase tailings powder with a particle size of 80μm.

[0054] S2: Sodium hydroxide, water glass, aluminum hydroxide, polycarboxylic acid and stabilizing material are mixed in proportion by mass at room temperature and water is added and stirred evenly to obtain an alkali activator;

[0055] S3: Mix diabase tailings powder with alkali activator, and then stir at 120 r / min for 5 min to obtain diabase tailings geopolymer mixture (the liquid-solid ratio of the diabase tailings geopolymer mixture is 0.35).

[0056] S4: Place the diabase tailings geopolymer mixture into a mold and cure at room temperature for 24 hours. Then remove the mold and cure at 20℃ and 95% relative humidity for 7 days to obtain the diabase tailings geopolymer cementitious material.

[0057] Comparative Example 2

[0058] A diabase tailings geopolymer cementitious material comprises the following components in parts by weight: 100 parts diabase tailings, 16 parts sodium hydroxide, 104 parts water glass with a modulus of 2.23, 16 parts aluminum hydroxide, 2 parts polycarboxylate, and 6 parts stabilizing material (Haizhisen Co., Ltd. - Cement-based penetrating crystalline waterproof coating).

[0059] The preparation method of the diabase tailings geopolymer cementitious material in this embodiment includes the following steps:

[0060] S1: Dry the diabase tailings at 40℃ for 3.5h, then place them at room temperature for 3h, and then grind the diabase tailings into diabase tailings powder with a particle size of 80μm.

[0061] S2: Sodium hydroxide, water glass, aluminum hydroxide, polycarboxylic acid and stabilizing material are mixed in proportion by mass at room temperature and water is added and stirred evenly to obtain an alkali activator;

[0062] S3: Mix diabase tailings powder with alkali activator, and then stir at 120 r / min for 5 min to obtain diabase tailings geopolymer mixture (the liquid-solid ratio of the diabase tailings geopolymer mixture is 0.35).

[0063] S4: Place the diabase tailings geopolymer mixture into a mold and cure at room temperature for 24 hours. Then remove the mold and cure in a sealed bag at room temperature for 7 days to obtain the diabase tailings geopolymer cementitious material.

[0064] Comparative Example 3

[0065] A diabase tailings geopolymer cementitious material comprises the following components in parts by weight: 100 parts diabase tailings, 16 parts sodium hydroxide, 104 parts water glass with a modulus of 2.23, 16 parts aluminum hydroxide, 2 parts polycarboxylate, and 6 parts stabilizing material (Haizhisen Co., Ltd. - Cement-based penetrating crystalline waterproof coating).

[0066] The preparation method of the diabase tailings geopolymer cementitious material in this embodiment includes the following steps:

[0067] S1: Dry the diabase tailings at 40℃ for 3.5h, then place them at 300℃ for 3h for activation, and then grind the activated diabase tailings into diabase tailings powder with a particle size of 80μm.

[0068] S2: Sodium hydroxide, water glass, aluminum hydroxide, polycarboxylic acid and stabilizing material are mixed in proportion by mass at room temperature and water is added and stirred evenly to obtain an alkali activator;

[0069] S3: Mix diabase tailings powder with alkali activator, and then stir at 120 r / min for 5 min to obtain diabase tailings geopolymer mixture (the liquid-solid ratio of the diabase tailings geopolymer mixture is 0.35).

[0070] S4: Place the diabase tailings geopolymer mixture into a mold and cure at room temperature for 24 hours. Then remove the mold and cure in a sealed bag at room temperature for 7 days to obtain the diabase tailings geopolymer cementitious material.

[0071] Comparative Example 4

[0072] A diabase tailings geopolymer cementitious material comprises the following components in parts by weight: 80 parts diabase tailings, 10 parts sodium hydroxide, 80 parts water glass with a modulus of 2.23, 10 parts aluminum hydroxide, 1 part polycarboxylate, and 2 parts stabilizing material (Haizhisen Co., Ltd. - Cement-based penetrating crystalline waterproof coating).

[0073] The preparation method of the diabase tailings geopolymer cementitious material in this embodiment includes the following steps:

[0074] S1: Dry the diabase tailings at 30℃ for 4 hours, then place them at 120℃ for 3 hours to activate them, and then grind the activated diabase tailings into diabase tailings powder with a particle size of 100μm.

[0075] S2: Sodium hydroxide, water glass, aluminum hydroxide, polycarboxylic acid and stabilizing material are mixed in proportion by mass at room temperature and water is added and stirred evenly to obtain an alkali activator;

[0076] S3: Mix diabase tailings powder with alkali activator, and then stir at 100 r / min for 6 min to obtain diabase tailings geopolymer mixture (the liquid-solid ratio of the diabase tailings geopolymer mixture is 0.35).

[0077] S4: Place the diabase tailings geopolymer mixture into a mold and cure at room temperature for 24 hours. Then remove the mold and cure in a sealed bag at room temperature for 7 days to obtain the diabase tailings geopolymer cementitious material.

[0078] Comparative Example 5

[0079] A diabase tailings geopolymer cementitious material comprises the following components in parts by weight: 120 parts diabase tailings, 20 parts sodium hydroxide, 120 parts water glass with a modulus of 2.23, 20 parts aluminum hydroxide, 3 parts polycarboxylic acid, and 11 parts stabilizing material (Haizhisen Co., Ltd. - cement-based penetrating crystalline waterproof coating).

[0080] The preparation method of the diabase tailings geopolymer cementitious material in this embodiment includes the following steps:

[0081] S1: Dry the diabase tailings at 45℃ for 3 hours, then place them at 200℃ for 3 hours to activate them, and then grind the activated diabase tailings into diabase tailings powder with a particle size of 45μm.

[0082] S2: Sodium hydroxide, water glass, aluminum hydroxide, polycarboxylic acid and stabilizing material are mixed in proportion by mass at room temperature and water is added and stirred evenly to obtain an alkali activator;

[0083] S3: Mix diabase tailings powder with alkali activator, and then stir at 120 r / min for 5 min to obtain diabase tailings geopolymer mixture (the liquid-solid ratio of the diabase tailings geopolymer mixture is 0.35).

[0084] S4: Place the diabase tailings geopolymer mixture into a mold and cure at room temperature for 24 hours. Then remove the mold and cure in a sealed bag at room temperature for 7 days to obtain the diabase tailings geopolymer cementitious material.

[0085] Comparative Example 6

[0086] A diabase tailings geopolymer cementitious material comprises the following components in parts by weight: 100 parts diabase tailings, 16 parts sodium hydroxide, 104 parts water glass with a modulus of 2.23, 16 parts aluminum hydroxide, 2 parts polycarboxylate, and 6 parts stabilizing material (Haizhisen Co., Ltd. - Cement-based penetrating crystalline waterproof coating).

[0087] The preparation method of the diabase tailings geopolymer cementitious material in this embodiment includes the following steps:

[0088] S1: The diabase tailings were dried at 40℃ for 3.5h, then calcined at 600℃ for 1h to activate them, and then the activated diabase tailings were ground into diabase tailings powder with a particle size of 80μm.

[0089] S2: Sodium hydroxide, water glass, aluminum hydroxide, polycarboxylic acid and stabilizing material are mixed in proportion by mass at room temperature and water is added and stirred evenly to obtain an alkali activator;

[0090] S3: Mix diabase tailings powder with alkali activator, and then stir at 120 r / min for 5 min to obtain diabase tailings geopolymer mixture (the liquid-solid ratio of the diabase tailings geopolymer mixture is 0.35).

[0091] S4: Place the diabase tailings geopolymer mixture into a mold and cure at room temperature for 24 hours. Then remove the mold and cure at 20℃ and 95% relative humidity for 7 days to obtain the diabase tailings geopolymer cementitious material.

[0092] Experimental Example 1

[0093] Chemical composition analysis of diabase tailings: XDF analysis was performed on the diabase tailings, and the results are shown in Table 1.

[0094] Table 1 Chemical composition of diabase tailings

[0095]

[0096] Diabase tailings contain a large amount of SiO2 and Al2O3, which are good precursors for potential alkali-activated cementitious materials. Under the activation of alkaline solution, they form a three-dimensional network structure cement. This material has rapid strength development, good durability, and extremely low carbon emissions, and has broad prospects for industrial application.

[0097] Experiment Example 2

[0098] Compressive strength test: The diabase tailings geopolymer cementitious materials prepared in Examples 1-3 and Comparative Examples 1-5 were cured for 7 days and their compressive strength was tested respectively. The results are shown in Table 1.

[0099] Table 1 Compressive strength test results

[0100]

[0101] Experimental Example 3

[0102] Flexural strength test: The diabase tailings geopolymer cementitious materials prepared in Examples 1-3 and Comparative Examples 1-5 were cured for 7 days and their flexural strength was tested respectively. The results are shown in Table 2.

[0103] Table 2 Flexural Strength Test Results

[0104]

[0105] In summary, the diabase tailings geopolymer cementitious material of the present invention employs a low-temperature activation technology, which, compared to the traditional high-temperature calcination activation (Comparative Example 6), reduces energy consumption and harmful substance emissions. Simultaneously, the resulting cementitious material exhibits better compressive and flexural strength. At an activation temperature of 300℃, the obtained diabase tailings geopolymer cementitious material achieves the highest compressive and flexural strengths, reaching 44.93 MPa and 14.77 MPa respectively, demonstrating its superior performance. Furthermore, the cementitious material undergoes standard curing (Examples 1-3) in the preparation method of the present invention, which also exhibits better compressive and flexural strengths compared to sealed curing (Comparative Examples 3-5). Therefore, the low-temperature activation technology combined with suitable standard curing conditions of the present invention yields a pressure-resistant and highly tough diabase tailings geopolymer cementitious material. Moreover, the preparation method is simple, low-cost, and energy-efficient, demonstrating excellent prospects for industrial application.

[0106] Although specific embodiments of the present invention have been described in detail with reference to examples, they should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims are still within the scope of protection of this patent.

Claims

1. A geopolymer cementitious material for diabase tailings, characterized in that, The composition comprises the following components in parts by weight: 80-120 parts diabase tailings, 10-20 parts sodium hydroxide, 80-120 parts water glass, 10-20 parts aluminum hydroxide, 1-3 parts water-reducing agent, and 2-11 parts stabilizing material; the diabase tailings geopolymer cementitious material is prepared by the following steps: S1: Drying the diabase tailings and activating them at 120-300℃, then grinding the activated diabase tailings into diabase tailings powder; S2: Mixing sodium hydroxide, water glass, aluminum hydroxide, and water-reducing agent... S3: Mix the diabase tailings powder with the alkali activator at room temperature and add water to stir evenly to obtain an alkali activator; S4: Mix the diabase tailings powder with the alkali activator and stir at 100~120 r / min for 5~6 min to obtain a diabase tailings geopolymer mixture; S5: Place the diabase tailings geopolymer mixture into a mold and cure at room temperature for 24 h, then remove the mold and perform standard curing to obtain a diabase tailings geopolymer cementitious material; The standard curing is performed at 20±2℃, relative humidity ≥95%, for 7 days.

2. The diabase tailings geopolymer cementitious material according to claim 1, characterized in that, The composition includes the following components in parts by weight: 100 parts diabase tailings, 16 parts sodium hydroxide, 104 parts water glass, 16 parts aluminum hydroxide, 2 parts water-reducing agent, and 6 parts stabilizing material.

3. The diabase tailings geopolymer cementitious material according to claim 2, characterized in that: The modulus of the water glass is 2.

23.

4. The diabase tailings geopolymer cementitious material according to claim 2, characterized in that: The water-reducing agent is polycarboxylic acid.

5. The diabase tailings geopolymer cementitious material according to claim 1, characterized in that: The drying process involves drying the diabase tailings at 30-45°C for 3-4 hours.

6. The diabase tailings geopolymer cementitious material according to claim 1, characterized in that: The activation process involves placing the diabase tailings at 120-300℃ for 3 hours.

7. The diabase tailings geopolymer cementitious material according to claim 1, characterized in that: The particle size of the diabase tailings powder is 45~100μm.

8. The diabase tailings geopolymer cementitious material according to claim 1, characterized in that: The liquid-to-solid ratio of the diabase tailings geopolymer mixture is 0.35.

Images