Microwave activation method for coating copper tailings with water glass and application of microwave activation method

Abstract

The invention discloses a microwave activation method for coating copper tailings with water glass and application of the microwave activation method, and belongs to the technical field of comprehensive utilization and treatment of the copper tailings. The microwave activation method for coating the copper tailings with the water glass comprises the steps that the water glass and a water-soluble polymer substance are fully mixed in deionized water to obtain a water glass composite solution, then copper tailings particles are added to form water glass composite slurry containing the copper tailings particles, the water glass composite slurry is dried to generate a water glass composite coating layer, and the water glass composite coating layer is coated with the water glass. And finally, the copper tailing particles coated with the water glass composite coating layer are subjected to microwave activation treatment. According to the microwave activation method, the cladding layer is used for regulating and controlling the energy absorption behavior to generate a large number of micro-area stress fields in the copper tailing particles in the cladding layer, micro-cracks are induced to be formed in the particles, and uniform activation of the copper tailing particles is achieved; the technical problems of low tailing activity index, non-uniform activation, agglomeration and the like in the existing activation technology are effectively solved, and the reaction activity and utilization potential of the copper tailings are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the technical field of comprehensive utilization and treatment of copper tailings, specifically relating to a microwave activation method for copper tailings coated with water glass and its application. Background Technology

[0002] Copper tailings are solid waste discharged after crushing, grinding, and sorting natural copper ore. my country has a large stockpile of copper tailings, low resource utilization, and high construction and maintenance costs for copper tailings ponds, making the resource utilization of copper tailings an urgent problem to be solved. Since its chemical composition is mainly SiO2, Al2O3, Fe2O3, and CaO, which is very similar to the composition of building materials, it can be used as fine aggregate in concrete, cement admixtures, and concrete additives after pretreatment. This is currently one of the important directions for the large-scale application of copper tailings. However, copper tailings require drying and grinding processes in application, resulting in high production costs. Furthermore, copper tailings are chemically inert and have low activity, limiting their application. Therefore, effectively improving the activity of copper tailings has become key to promoting its resource utilization in the building materials field.

[0003] Currently, common methods for activating copper tailings include mechanical, chemical, and thermal activation methods, but these methods suffer from problems such as high energy consumption, high cost, and large carbon emissions. Microwave activation, as an emerging method, has certain applications in improving the activation performance of solid waste materials such as fly ash and coal gangue. For example, in the paper "Research on Microwave Irradiation Activation of Fly Ash Auxiliary Cementitious Materials [J]. Cement, 2024, (02): 31-35" published by Shen Hongdong, Li Shuhui, Luo Shuqiong, et al., it was found that microwave irradiation can stimulate the activity of fly ash, with the optimal irradiation power being 1000W, and the activity index after 28 days increasing from 75.04% to 80.89% of the original fly ash. However, this method may still have problems such as excessively high microwave power and uneven activation within the fly ash. For example, in the study "Influence of Microwave Activation of Coal Gangue on the Performance of Cement-Based Materials [J]. Materials Reports, 2023, 37(04): 95-101" published by Guan Xiao, Chen Jixi, Zhu Mengyu, et al., it was found that when the microwave temperature was 500~600℃, the pozzolanic activity of coal gangue powder was significantly improved. When the coal gangue powder content was 10%, 20%, and 30%, the 28-day compressive strength of the test blocks was increased by 46.5%, 37.9%, and 51.1% respectively compared with the unactivated group. However, during the microwave treatment, the coal gangue particles exhibited agglomeration, failing to achieve uniform and efficient activation of the particles. Similarly, in order to adopt the microwave activation method to replace the traditional activation method and achieve efficient and low-energy activation of copper tailings solid waste, and to quickly improve the activity of copper tailings, it is also necessary to solve or avoid the aforementioned problems. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a microwave activation method for copper tailings coated with water glass and its application, so as to solve the technical problems of low tailings activity index, uneven activation and agglomeration in the existing activation technology.

[0005] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides a microwave activation method for copper tailings coated with water glass, comprising the following steps: Step 1: Weigh water glass and water-soluble polymers and add them to deionized water and mix thoroughly to obtain a water glass composite solution; Step 2: Weigh out copper tailings particles according to the proportion, add the copper tailings particles to the water glass composite solution in Step 1, stir to disperse them evenly, and obtain water glass composite slurry containing copper tailings particles. Step 3: Spread out the water glass composite slurry containing copper tailings particles from Step 2 and dry it to obtain a water glass composite coating layer. Step 4: Spread out the copper tailings particles coated with the water glass composite coating layer in Step 3 evenly and perform microwave activation treatment.

[0006] A further improvement of the present invention is that, in step 1, the modulus of the water glass is 2.4-3.2.

[0007] A further improvement of the present invention is that, in step 1, the water-soluble polymer is polyacrylic acid, polyacrylamide and polyvinyl alcohol, wherein the mass concentration of each added water-soluble polymer is 0.5%-1%.

[0008] A further improvement of the present invention is that, in step 1, the mass concentration of the water glass composite solution obtained is 20%-30%.

[0009] A further improvement of the present invention is that, in step 2, the liquid-solid mass ratio of the water glass composite solution and the copper tailings particles is (1:1.2)-(1:1.5).

[0010] A further improvement of the present invention is that, in step 2, a stirrer is used for dispersion, the speed of the stirrer is 600rpm-800rpm, and the stirring time is 20-30min.

[0011] A further improvement of the present invention is that, in step 3, the thickness of the water glass composite slurry containing copper tailings particles is 5-10 mm.

[0012] A further improvement of the present invention is that, in step 3, an oven is used to dry the flattened water glass composite slurry containing copper tailings particles. The oven temperature is 100-120℃ and the drying time is 2 hours.

[0013] A further improvement of the present invention is that, in step 4, a microwave oven is used for microwave activation treatment, the microwave power of the microwave oven is 400-500W, and the microwave activation time is 25-35min.

[0014] Secondly, the present invention also provides the application of activated copper tailings prepared by the microwave activation method of the above-mentioned water glass-coated copper tailings in cement admixtures.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a microwave activation method for copper tailings coated with water glass. The method involves thoroughly mixing water glass and a water-soluble polymer in deionized water to obtain a water glass composite solution. Copper tailings particles are then added to form a water glass composite slurry containing copper tailings particles. After drying, a dense water glass composite coating layer is formed. Finally, the copper tailings particles coated with the water glass composite coating layer are subjected to microwave activation treatment. This microwave activation method utilizes the energy absorption behavior regulated by the coating layer to generate a large number of micro-stress fields within the copper tailings particles, inducing the formation of microcracks inside the particles. This achieves uniform activation of the copper tailings particles, effectively solving the technical problems of low tailings activity index, uneven activation, and agglomeration in existing activation technologies, and significantly improving the reactivity and utilization potential of copper tailings.

[0016] Furthermore, the coated copper tailings particles mainly contain sodium silicate and various mineral components. These components have different dielectric properties and coefficients of thermal expansion, leading to thermal stress during heating. This thermal stress causes microcracks to form inside the particles, especially at grain boundaries and the interface between the coating layer and the tailings particles. These microcracks disrupt the integrity of the mineral lattice, causing some crystalline phases to disintegrate into smaller particles, significantly increasing the specific surface area and porosity of the copper tailings particles, thus giving them higher reactivity.

[0017] Furthermore, during microwave activation, electromagnetic waves act on the interior of the material, causing polar molecules (such as water molecules) and conductive particles to vibrate rapidly and generate heat. The outer shell encapsulated by the water glass composite solution can effectively fill the pores and defects on the surface of copper tailings, increasing the density of the particle surface. The coating layer can regulate energy absorption behavior, making the energy distribution more even when the microwave field is applied, avoiding local overheating or underheating caused by irregular particle shape, thus preventing uneven activation or agglomeration. Attached Figure Description

[0018] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components of the invention.

[0019] Figure 1(a) is a SEM image of untreated copper tailings particles; Figure 1(b) is a SEM image of copper tailings particles coated with a layer of water glass composite solution; Figure 1(c) is a SEM image of copper tailings particles coated with water glass composite solution and microwave treated. Figure 2 The compressive strength diagrams at 3d, 7d, and 28d are shown for mortar test blocks prepared from untreated copper tailings particles, copper tailings particles coated with water glass composite solution, and copper tailings particles coated with water glass composite solution and microwave activated, as described in Example 1. Figure 3 The 3-day, 7-day, and 28-day compressive strength diagrams are shown for mortar test blocks prepared from untreated copper tailings particles, copper tailings particles coated with water glass composite solution, and copper tailings particles coated with water glass composite solution and microwave activated, as described in Example 2. Detailed Implementation

[0020] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0021] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0022] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0023] In this article, unless otherwise specified, “contains,” “includes,” “containing,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of,” for example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a.”

[0024] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0025] This invention provides a microwave activation method for copper tailings coated with water glass, comprising the following steps: Step 1: Weigh water glass and water-soluble polymer into a stirring container, add deionized water, and mix thoroughly under stirring conditions to obtain a water glass composite solution; wherein the modulus of the water glass is 2.4-3.2, and the mass concentration of the obtained water glass composite solution is 20%-30%; Step 2: Weigh the copper tailings particles according to the liquid-solid mass ratio of water glass composite solution to copper tailings particles of (1:1.2)-(1:1.5), add the copper tailings particles to the water glass composite solution in Step 1, and use a stirrer for auxiliary dispersion. Set the speed of the stirrer to 600rpm-800rpm and the stirring time to 20-30min to obtain water glass composite slurry containing copper tailings particles. Step 3: Transfer the water glass composite slurry containing copper tailings particles from Step 2 to a drying tray and spread it evenly to a thickness of 5-10 mm. Then, place the drying tray in an oven to dry at a temperature of 100-120℃ for 2 hours to form a dense and stable water glass composite solution coating layer on the surface of the copper tailings particles. Step 4: Spread the copper tailings particles coated with the water glass composite solution coating layer in Step 3 evenly in a ceramic dish, and then place the ceramic dish in a microwave oven with a microwave power of 400-500W for microwave activation.

[0026] Specifically, the water-soluble polymers are polyacrylic acid, polyacrylamide, and polyvinyl alcohol, with each polymer added at a concentration of 0.5%-1%. This concentration range ensures that the polymers form a stable composite solution with water glass, preventing both incomplete coating due to excessively low concentrations and excessively high concentrations that could affect the uniform dispersion of copper tailings particles. Furthermore, the number-average molecular weight of polyacrylic acid ranges from 30,000 to 70,000; that of polyacrylamide from 500,000 to 800,000; and that of polyvinyl alcohol from 31,000 to 50,000. These three polymers synergistically construct the coating structure, ultimately achieving a significant increase in specific surface area and porosity.

[0027] This invention uses water glass as the main component, with small amounts of polyacrylic acid, polyacrylamide, and polyvinyl alcohol added. Through the reaction of CO2 in the air with the water glass, dehydration, crystallization, and solidification, and the action of microwaves, a hard and dense outer shell is formed on the outside of copper tailings particles. During microwave heating, a certain micro-pressure is generated inside the shell formed by the coating layer. Furthermore, by alternating the energy of the electric and magnetic fields within the shell through microwave modulation, dipole rotation and ionic conductor effects are generated with the polar molecules inside the copper tailings, inducing cracks on the surface of the copper tailings particles and promoting their efficient activation.

[0028] This invention also provides the application of activated copper tailings prepared by the microwave activation method of water glass-coated copper tailings described above in cement admixtures. When used as a cement admixture, the activated copper tailings exhibit high reactivity due to the microwave activation treatment, which significantly improves the mechanical properties and durability of cement-based materials.

[0029] In this invention, the mortar prepared from copper tailings particles coated with a water glass composite solution and then microwave-activated is evaluated for its pozzolanic activity index according to the strength index in the Chinese national standard GB / T12957—2005. The strength index is calculated by comparing the compressive strength of two mortar samples, and the calculation formula is as follows:

[0030] In the formula, Compressive strength, expressed in % %. The compressive strength values ​​of mortar prepared by replacing 30% silicate cement with copper tailings treated in different ways are given in MPa. The compressive strength value for mortar prepared from silicate cement, expressed in MPa.

[0031] In this invention, ordinary Portland cement is used. The 28-day compressive strength of the cement mortar sample is 43.45 MPa, which meets the requirements of the relevant national standard GB175-2007 "General Portland Cement". The copper tailings are from Yuanqu, Yuncheng Copper Mine in Shanxi Province (production 9.6 million tons / year), and their specific surface area after drying at 100℃ is 32.845 m². 2 / kg. The standard sand used is standard Chinese ISO standard sand, conforming to the basic requirements of GB / T17671-2021 "Cement - Test Methods - Determination of Strength (ISO Method)". The density of the sand is 1.425 g / cm³. 3 The fineness modulus is 2.11.

[0032] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0033] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" refers to weight percentage, "parts" refers to parts by weight, and "ratio" refers to weight proportion.

[0034] Example 1 This embodiment proposes a microwave activation method for copper tailings coated with water glass, comprising the following steps: Step 1: Weigh 33.113g of water glass, 1.058g of polyacrylic acid, 1.058g of polyacrylamide, and 1.058g of polyvinyl alcohol. Place the weighed components in a stirring container, add 114.912g of deionized water, and mix thoroughly under stirring until all components are completely dissolved. The added polyacrylic acid, polyacrylamide, and polyvinyl alcohol have a mass concentration of 0.7%, resulting in a uniform water glass composite solution with a mass of 151.2g and a concentration of 24%. Step 2: Weigh 126g of copper tailings particles and add them to 151.2g of water glass composite solution from Step 1 (liquid-solid mass ratio of 1.2:1). Then, stir the solution at 650rpm for 20min using a magnetic stirrer to ensure full dispersion. If agglomeration occurs, the stirring time can be extended appropriately to obtain water glass composite slurry containing copper tailings particles. Step 3: Transfer the water glass composite slurry containing copper tailings particles from Step 2 to a drying tray and spread it evenly to a thickness of 6 mm. Then, place the drying tray in an oven to dry at 100°C for 2 hours to form a dense and stable water glass composite solution coating layer on the surface of the copper tailings particles. In step 3 of this embodiment, the water gradually evaporates, and the water glass reacts with CO2 in the air, dehydrates, crystallizes and solidifies to produce a dense and stable water glass composite solution coating layer.

[0035] Step 4: Spread the copper tailings particles coated with water glass composite solution in step 3 evenly in a ceramic dish, place the ceramic dish in a microwave oven, and heat at 420W for 25 minutes for microwave activation.

[0036] In step 4 of this embodiment, microwave action promotes the reaction between the water glass composite solution coating layer and the outer surface of the copper tailings particles, accelerating the gelation process. The thermal stress generated by the microwave will cause microcracks to form inside the copper tailings particles, as well as at the grain boundaries and the interface between the water glass composite solution coating layer and the copper tailings particles.

[0037] In this embodiment, SEM tests were performed on the untreated copper tailings particles in step 2, the copper tailings particles coated with water glass composite solution in step 3, and the copper tailings particles coated with water glass composite solution and microwave-treated in step 4, as shown in Figures 1(a) to 1(c). As can be seen from Figures 1(a) to 1(c), the originally rough surface of the copper tailings particles is wrapped with a layer of water glass composite solution shell, and the rough surface and edges of the original copper tailings particles have become relatively smooth. Some cracks have appeared on the outer surface of the water glass composite solution coating layer of the copper tailings particles after microwave activation. This is because the thermal stress generated during microwave heating induces microcracks at the grain boundaries and interfaces, destroys the mineral lattice, and causes the crystal phase to disintegrate into smaller particles, which significantly increases the specific surface area, porosity and reactivity of the copper tailings.

[0038] In this embodiment, copper tailings cement mortar is prepared using copper tailings particles with microcracks on the surface obtained in step 4. The preparation steps include: weighing 294g of cement, 126g of copper tailings particles with microcracks on the surface, 1260g of standard sand and 210g of deionized water, with a water-cement ratio of about 0.5; preparing cement mortar according to the requirements of GB / T17671-2021 "Test Methods for Determination of Strength of Cement (ISO Method)"; and then curing it in a standard indoor environment at a temperature of 20±2℃ and a relative humidity greater than 95% until the specified age (3d, 7d and 28d).

[0039] In this embodiment, copper tailings cement mortar was prepared using both the untreated copper tailings particles from step 2 and the copper tailings particles coated with the water glass composite solution from step 3. The preparation steps were the same as those for preparing copper tailings cement mortar using copper tailings particles with microcracks on the surface obtained in step 4. Then, the mortar was cured in a standard indoor environment at a temperature of 20±2℃ and a relative humidity greater than 95% for the specified ages (3d, 7d, and 28d). The test results are as follows: Figure 2 As shown.

[0040] from Figure 2 As can be seen, the compressive strength increases with the increase of curing age. The compressive strength of the mortar in the water glass and microwave activation group at 3d, 7d, and 28d is consistently higher than that of the water glass-treated group and the untreated copper tailings group. Furthermore, the 28-day compressive strength of the copper tailings cement mortar in the water glass-treated group is 22.82 MPa, and the copper tailings activity index is 52.53%, while the 28-day compressive strength of the copper tailings cement mortar in the water glass and microwave activation group is 28.89 MPa, and the copper tailings activity index reaches the highest of 66.49%.

[0041] Compared to unactivated copper tailings, the 28-day activity index of copper tailings treated by the two different methods increased by 12.55% and 26.51%, respectively. The copper tailings treated with water glass and microwave activation exhibited the highest activity index and the greatest mortar compressive strength. This is because microwave heating excites polar molecular vibrations through electromagnetic waves, rapidly generating heat within the material. The outer shell can fill surface defects in the copper tailings and improve particle uniformity. Simultaneously, the dissolution of water glass in an alkaline environment provides reactive SiO4. 4- , with Ca released during cement hydration 2+ The reaction forms a C–S–H gel, accelerating the overall hydration rate. The increased gel phase content in the hydration products enhances the compressive strength of the copper tailings cement mortar, thereby improving its mechanical properties. Compared to untreated copper tailings and copper tailings only coated with a water glass composite solution, the copper tailings coated with the water glass composite solution and microwave-treated exhibit the highest activity index, and the prepared cement mortar specimens show superior mechanical properties.

[0042] Example 2 This embodiment proposes a microwave activation method for copper tailings coated with water glass, comprising the following steps: Step 1: Weigh 47.817g of water glass, 1.701g of polyacrylic acid, 1.701g of polyacrylamide and 1.701g of polyvinyl alcohol. Place the weighed components in a stirring container, add 136.080g of deionized water, and mix thoroughly under stirring until all components are completely dissolved. The added polyacrylic acid, polyacrylamide and polyvinyl alcohol have a mass concentration of 0.9%, resulting in a uniform water glass composite solution with a mass of 189g and a concentration of 28%. Step 2: Weigh 126g of copper tailings particles and add them to 189g of water glass composite solution from Step 1 (liquid-solid mass ratio of 1.5:1). Then, use a magnetic stirrer to stir at 750rpm for 30min to ensure full dispersion. If agglomeration occurs, the time can be extended appropriately to obtain water glass composite slurry containing copper tailings particles. Step 3: Transfer the water glass composite slurry containing copper tailings particles from Step 2 to a drying tray and spread it evenly to a thickness of 7mm. Then, place the drying tray in an oven to dry at 120℃ for 2 hours to form a dense and stable water glass composite solution coating layer on the surface of the copper tailings particles. In step 3 of this embodiment, the water gradually evaporates, and the water glass reacts with CO2 in the air, dehydrates, crystallizes and solidifies to produce a dense and stable water glass composite solution coating layer.

[0043] Step 4: Spread the copper tailings particles coated with water glass composite solution in step 3 evenly in a ceramic dish, place the ceramic dish in a microwave oven, and heat at 460W for 35 minutes for microwave activation.

[0044] In step 4 of this embodiment, microwave action promotes the reaction between the water glass composite solution coating layer and the outer surface of the copper tailings particles, accelerating the gelation process. The thermal stress generated by the microwave will cause microcracks to form inside the copper tailings particles, as well as at the grain boundaries and the interface between the water glass composite solution coating layer and the copper tailings particles.

[0045] In this embodiment, copper tailings cement mortar is prepared using copper tailings particles with microcracks on the surface obtained in step 4. The preparation steps include: weighing 294g of cement, 126g of copper tailings particles with microcracks on the surface, 1260g of standard sand and 210g of deionized water, with a water-cement ratio of about 0.5; preparing cement mortar according to the requirements of GB / T17671-2021 "Test Methods for Determination of Strength of Cement (ISO Method)"; and then curing it in a standard indoor environment at a temperature of 20±2℃ and a relative humidity greater than 95% until the specified age (3d, 7d and 28d).

[0046] In this embodiment, copper tailings cement mortar was prepared using both the untreated copper tailings particles from step 2 and the copper tailings particles coated with the water glass composite solution from step 3. The preparation steps were the same as those for preparing copper tailings cement mortar using copper tailings particles with microcracks on the surface obtained in step 4. Then, the mortar was cured in a standard indoor environment at a temperature of 20±2℃ and a relative humidity greater than 95% for the specified ages (3d, 7d, and 28d). The test results are as follows: Figure 3 As shown.

[0047] from Figure 3 As can be seen, the compressive strength increases with the increase of curing age. The 28-day compressive strength of the copper tailings cement mortar treated with water glass was 28.32 MPa, and the copper tailings activity index was 65.18%. The 28-day compressive strength of the copper tailings cement mortar treated with both water glass and microwave activation was 34.93 MPa, and the copper tailings activity index reached 80.39%. Compared with unactivated copper tailings, the 28-day activity index of copper tailings increased by 25.20% and 40.41% respectively under the two different treatment methods.

[0048] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A microwave activation method for copper tailings coated with water glass, characterized in that, Includes the following steps: Step 1: Weigh water glass and water-soluble polymers and add them to deionized water and mix thoroughly to obtain a water glass composite solution; Step 2: Weigh out copper tailings particles according to the proportion, add the copper tailings particles to the water glass composite solution in Step 1, stir to disperse them evenly, and obtain water glass composite slurry containing copper tailings particles. Step 3: Spread out the water glass composite slurry containing copper tailings particles from Step 2 and dry it to obtain a water glass composite coating layer. Step 4: Spread out the copper tailings particles coated with the water glass composite coating layer in Step 3 evenly and perform microwave activation treatment.

2. The microwave activation method for copper tailings coated with water glass according to claim 1, characterized in that, In step 1, the modulus of the water glass is 2.4-3.

2.

3. The microwave activation method for copper tailings coated with water glass according to claim 1, characterized in that, In step 1, the water-soluble polymers are polyacrylic acid, polyacrylamide, and polyvinyl alcohol, and the mass concentration of each added water-soluble polymer is 0.5%-1%.

4. The microwave activation method for copper tailings coated with water glass according to claim 1, characterized in that, In step 1, the mass concentration of the water glass composite solution obtained is 20%-30%.

5. The microwave activation method for copper tailings coated with water glass according to claim 1, characterized in that, In step 2, the liquid-solid mass ratio of the water glass composite solution and the copper tailings particles is (1:1.2)-(1:1.5).

6. The microwave activation method for copper tailings coated with water glass according to claim 1, characterized in that, In step 2, a stirrer is used for dispersion. The speed of the stirrer is 600 rpm-800 rpm, and the stirring time is 20-30 minutes.

7. The microwave activation method for copper tailings coated with water glass according to claim 1, characterized in that, In step 3, the thickness of the water glass composite slurry containing copper tailings particles is 5-10 mm.

8. The microwave activation method for copper tailings coated with water glass according to claim 1, characterized in that, In step 3, the water glass composite slurry containing copper tailings particles that has been spread out is dried in an oven at a temperature of 100-120℃ for 2 hours.

9. The microwave activation method for copper tailings coated with water glass according to claim 1, characterized in that, In step 4, a microwave oven is used for microwave activation treatment. The microwave power of the microwave oven is 400-500W, and the microwave activation time is 25-35min.

10. The application of activated copper tailings prepared by the microwave activation method of water glass coated copper tailings according to any one of claims 1 to 9 in cement admixtures.

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