A multi-solid waste based porous geopolymer material and a method of making the same

Abstract

This invention discloses a porous geopolymer material based on solid waste and its preparation method. The porous geopolymer is composed of solid powder, a foaming agent, and an alkali activator. The solid powder is composed of iron tailings and blast furnace slag, and the alkali activator is made solely from a mixture of calcium carbide slag and water. This invention uses iron tailings and blast furnace slag as the main raw materials, mixes them with a foaming agent, and utilizes solid waste as an alkali activator to obtain a novel porous material. The process is simple, produces no CO2 emissions, and exhibits strong compressive strength among porous materials. It also realizes the resource utilization of iron tailings and blast furnace slag, effectively solving the environmental pollution problems caused by the stockpiling of iron tailings and slag.

Description

Technical Field

[0001] This invention belongs to the field of geopolymer materials, specifically relating to a multi-solid waste-based porous geopolymer material and its preparation method. Background Technology

[0002] The rapid development of modern society has led to an ever-increasing demand for steel and acetylene. The production of these two substances inevitably generates large quantities of iron tailings, blast furnace slag, and calcium carbide slag, which are major components of my country's bulk industrial solid waste. However, the current practice of stockpiling iron tailings, slag, and calcium carbide slag has the following drawbacks: 1) it consumes a large amount of land resources; 2) leachate from the stockpiling process pollutes the soil and groundwater; 3) the dust generated by untreated stockpiled powdery materials causes air pollution; 4) the toxic chemicals they contain pose a threat to human health and wildlife; and 5) failing to treat them results in the waste of secondary resources. Therefore, the comprehensive utilization of iron tailings, slag, and calcium carbide slag has become an important trend in the treatment of bulk industrial solid waste. Geopolymers, inorganic cementitious materials with a three-dimensional network structure composed of [SiO4] tetrahedral and [AlO4] tetrahedral structural units, are obtained from one or more silica-alumina raw materials under the action of alkaline activators. They represent the third generation of cement after traditional OPC, possessing advantages such as low energy consumption, simple preparation process, low CO2 emissions, high strength, and good durability. Using iron tailings, slag, and carbide slag as raw materials, and SDS and hydrogen peroxide as foaming agents, porous geopolymers can be prepared. This not only effectively utilizes the silica-alumina oxides in iron tailings and slag but also leverages the alkaline components inherent in carbide slag for alkaline activation. However, current research on porous materials using only solid waste as alkaline activators is limited. Therefore, studying the preparation of porous geopolymers from these three solid wastes—iron tailings, slag, and carbide slag—has significant environmental and ecological implications for the comprehensive utilization of tailings and slag. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a porous geopolymer material based on solid waste and its preparation method. The porous geopolymer material prepared by adding slag, iron tailings, and carbide slag can improve the porosity and surface activity of the geopolymer, and can play a good technical role in adsorption, heat insulation and other fields. It can also be used as a lightweight building material.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A porous geopolymer material based on solid waste is composed of solid powder, alkali activator, and foaming agent;

[0006] Furthermore, the solid powder consists of 30wt%~70wt% iron tailings and 30wt%~70wt% slag, with the sum of their weight percentages being 100%; the preferred ratio of the two is 50%:50%.

[0007] The alkaline activator used in the preparation of this material is only a mixture of carbide slag and water. The amount of carbide slag accounts for 30%-60% of the mass of iron tailings, and the ratio of water to iron tailings mass is 1.4-1.1:1.

[0008] The foaming agent used to create the channels is a mixture of hydrogen peroxide and solid SDS (sodium dodecyl sulfate), wherein the amount of hydrogen peroxide is 0.2%-1.2% of the iron tailings mass and the amount of solid SDS (sodium dodecyl sulfate) is 0.6% of the iron tailings mass.

[0009] Furthermore, based on a total weight percentage of 100%, the mass percentages of each component in the iron tailings are as follows: SiO2 30%~50%, Al2O3 10%~20%, Fe2O3 20%~30%, CaO 5%~10%, MgO 1%~3%, K2O 1%~3%, Na2O 1%~3%, TiO2 1%~2%, MnO 0.1%~0.5%, and its loss on ignition is 0.4%~1%.

[0010] The main components in the slag have the following mass percentages: SiO2 30-35%, CaO 35-45%, Al2O3 15-20%, TiO2 1-5%, MgO 1-5%, Na2O 1-2%, K2O 0.1-0.5%, Fe2O3 0.1-0.5%;

[0011] The calcium carbide slag is the waste residue generated after the hydrolysis of calcium carbide to prepare acetylene. The main components account for the following mass percentages: CaO 90~95%, SiO2 1~5%, Al2O3 0.5~1%, Cl 0.5~1%, Na2O 0.5~1%, F 0.5~1%, Fe2O3 0.1~0.5%, SO3 0.1~0.5%, MgO 0.1~0.5%.

[0012] Furthermore, the particle size of the iron tailings, slag, and carbide slag is less than 0.075 mm.

[0013] Furthermore, the hydrogen peroxide is of analytical grade and has a percentage content of 10% to 70%, preferably 30%.

[0014] The preparation method of the multi-solid waste-based porous geopolymer material includes the following steps:

[0015] Step S1: Mix iron tailings and slag evenly in a certain proportion to obtain solid powder A;

[0016] Step S2: Dissolve SDS completely in water according to the ratio, then add carbide slag according to the ratio, stir and mix well, and let stand for a period of time to obtain the alkali activator.

[0017] Step S3: Mix the obtained solid powder A with the alkali activator and mechanically stir for 2-4 minutes to obtain mixed slurry B;

[0018] Step S4: Add hydrogen peroxide to the mixed slurry B in proportion, and then mechanically stir for 1-2 minutes to obtain porous geopolymer slurry C;

[0019] Step S5: Pour slurry C into the mold and seal it. Cure at room temperature for 24 hours, then place it in an oven for 6 hours. Cure the molded blank at room temperature for 14 days until demolding.

[0020] Furthermore, in the oven curing process described in step S5, the surface curing temperature of the mold and the specimen is controlled to be no higher than 60°C.

[0021] This invention primarily utilizes iron tailings and slag as raw materials to provide active silica-alumina compounds. The alkali activator consists only of calcium carbide slag (a solid waste) and water. Through the combined action of added SDS (sodium dodecyl sulfate) and hydrogen peroxide, the porosity and surface activity of the geopolymer are jointly improved. The main component of calcium carbide slag is calcium oxide, and its alkalinity directly facilitates alkali activation. Within the geopolymer, the active silica-alumina compound components from the iron tailings and slag undergo complexation. Furthermore, the foaming agent and alkali activator are added when the slurry becomes viscous. This allows the active silica-alumina compounds to form an inherent three-dimensional structure and also to fix a large number of pores, thus significantly enhancing the surface activity of the geopolymer.

[0022] Compared with existing methods, the significant advantages of the present invention are:

[0023] 1) This invention uses industrial solid waste to prepare porous geopolymer materials. The raw materials are widely available, the preparation process is green and environmentally friendly, with no CO2 emissions and low production costs. It effectively solves the problems of tailings accumulation and environmental pollution, and is conducive to the high-value utilization of industrial solid waste.

[0024] 2) The porous geopolymer prepared by this invention has good compressive strength among porous materials.

[0025] 3) Unlike traditional geopolymers, this invention uses only solid waste and water as alkaline activators. The prepared geopolymer has a porous structure, and its surface activity is significantly enhanced compared to traditional geopolymers, resulting in significantly optimized performance.

[0026] 4) The materials for this invention are readily available and the technical route is simple. It only requires mixing and stirring the raw materials, followed by a little curing, making it easy to operate. Attached Figure Description

[0027] Figure 1 The image shows the XRD pattern of the iron tailings used in the example.

[0028] Figure 2 The image shows the XRD pattern of the slag used in the example.

[0029] Figure 3 The images shown are XRD patterns of samples from some of the embodiments. Detailed Implementation

[0030] A porous geopolymer material based on solid waste is composed of solid powder, alkali activator, and foaming agent;

[0031] The solid powder is composed of iron tailings and slag in a weight percentage ratio of 50:50. The alkali activator used in the preparation of this material is only a mixture of carbide slag and water. The amount of carbide slag accounts for 30%-60% of the mass of iron tailings, and the mass ratio of water to iron tailings is 1.4-1.1:1.

[0032] The foaming agent used to create the channels is a mixture of hydrogen peroxide and solid SDS (sodium dodecyl sulfate), wherein the amount of hydrogen peroxide is 0.2%-1.2% of the iron tailings mass and the amount of solid SDS is 0.6% of the iron tailings mass.

[0033] Based on a total weight percentage of 100%, the mass percentages of each component in the iron tailings are as follows: SiO2 30%~50%, Al2O3 10%~20%, Fe2O3 20%~30%, CaO 5%~10%, MgO 1%~3%, K2O 1%~3%, Na2O 1%~3%, TiO2 1%~2%, MnO 0.1%~0.5%, and its loss on ignition is 0.4%~1%.

[0034] The mass percentages of each component in the slag are as follows: SiO2 30-35%, CaO 35-45%, Al2O3 15-20%, TiO2 1-5%, MgO 1-5%, Na2O 1-2%, K2O 0.1-0.5%, Fe2O3 0.1-0.5%;

[0035] The calcium carbide slag is the waste residue generated after the hydrolysis of calcium carbide to prepare acetylene, and the mass percentage of each component is as follows: CaO 90~95%, SiO2 1~5%, Al2O3 0.5~1%, Cl 0.5~1%, Na2O 0.5~1%, F 0.5~1%, Fe2O3 0.1~0.5%, SO3 0.1~0.5%, MgO 0.1~0.5%.

[0036] Furthermore, the particle size of the iron tailings, slag, and carbide slag is less than 0.075 mm.

[0037] Furthermore, the hydrogen peroxide is of analytical grade and has a content of 30%.

[0038] The preparation method of the multi-solid waste-based porous geopolymer material includes the following steps:

[0039] Step S1: Mix iron tailings and slag evenly in a certain proportion to obtain solid powder A;

[0040] Step S2: Dissolve SDS completely in water according to the ratio, then add carbide slag according to the ratio, stir and mix well, and let stand for a period of time to obtain the alkali activator.

[0041] Step S3: Mix the obtained solid powder A with the alkali activator and mechanically stir for 2-4 minutes to obtain mixed slurry B;

[0042] Step S4: Add hydrogen peroxide to the mixed slurry B in proportion, and then mechanically stir for 1-2 minutes to obtain porous geopolymer slurry C;

[0043] Step S5: Pour slurry C into the mold and seal it. Cure at room temperature for 24 hours, then place it in an oven for 6 hours. Cure the molded green body at room temperature for 14 days until demolding.

[0044] To make the content of this invention easier to understand, the technical solution of this invention will be further described below with reference to specific embodiments, but this invention is not limited thereto.

[0045] The mass percentages of each component in the iron tailings used in the following examples are as follows: SiO2 45.07%, Al2O3 13.38%, Fe2O3 25.75%, CaO 6.91%, MgO 2.47%, K2O 2.42%, Na2O 2.03%, TiO2 1.75%, MnO 0.22%, with a loss on ignition of 0.5%.

[0046] The mass percentages of the main components in the slag used in the following examples are as follows: SiO2 30.57%, CaO 38.55%, Al2O3 15.09%, TiO2 1.60%, MgO 1.305%, Na2O 0.50%, K2O 0.37%, Fe2O3 0.33%;

[0047] The calcium carbide slag used in the following examples comes from the waste residue generated after the hydrolysis of calcium carbide to prepare acetylene. The main components account for the following mass percentages: CaO 93.47%, SiO2 3.03%, Al2O3 0.946%, Cl 0.585%, Na2O 0.531%, F 0.41%, Fe2O3 0.348%, SO3 0.304%, MgO 0.183%.

[0048] The hydrogen peroxide used in the following examples is of analytical grade and has a purity of 30%.

[0049] The water used in the following examples is free water.

[0050] Example 1:

[0051] The porous geopolymer material in this embodiment includes solid powder, a foaming agent, and an alkali activator. The solid powder contains 50% iron tailings and 50% slag by mass. The alkali activator contains 30% calcium carbide slag and 110% water by mass of the iron tailings. The foaming agent contains 0.6% hydrogen peroxide by mass of the iron tailings, with analytical purity and a mass percentage of 30%. The solid SDS contains 0.6% SDS by mass of the iron tailings.

[0052] During preparation, 50g of iron tailings and 50g of slag were weighed and mixed evenly to obtain powder A. 0.3g of SDS (sodium dodecyl sulfate) was weighed and dissolved in 55g of water. After complete dissolution, 15g of carbide slag was added and stirred evenly, and then allowed to stand for 1min to obtain an alkali activator. Powder A and the alkali activator were mixed and stirred for 3min to obtain slurry B. 0.3ml of hydrogen peroxide was added to slurry B and mixed and stirred for 1-2min to obtain slurry C. The slurry C was poured into a rubber mold for casting. After solidification, the sample was obtained. The sample and mold were sealed and cured at room temperature for 24h, and then placed in an oven for 6h. After the green body was formed, it was cured at room temperature for 14 days until demolding.

[0053] Example 2:

[0054] The porous geopolymer material in this embodiment includes solid powder, foaming agent, and alkali activator; the solid powder contains 50% iron tailings by mass and 50% slag by mass; the alkali activator contains 30% calcium carbide slag by mass and 110% water by mass; the foaming agent contains 1% hydrogen peroxide by mass, with analytical purity and a mass percentage of 30%; and solid SDS contains 0.6% solid SDS by mass.

[0055] During preparation, 50g of iron tailings and 50g of slag were weighed and mixed evenly to obtain powder A. 0.3g of SDS (sodium dodecyl sulfate) was weighed and dissolved in 55g of water. After complete dissolution, 15g of carbide slag was added and stirred evenly, and then allowed to stand for 1 minute to obtain an alkali activator. Powder A and the alkali activator were mixed and stirred for 3 minutes to obtain slurry B. 0.5ml of hydrogen peroxide was added to slurry B and mixed and stirred for 1-2 minutes to obtain slurry C. The slurry C was poured into a rubber mold for casting. After solidification, the sample was obtained. The sample and mold were sealed and cured at room temperature for 24 hours, and then placed in an oven for 6 hours. After the green body was formed, it was cured at room temperature for 14 days until demolding.

[0056] Example 3:

[0057] The porous geopolymer material in this embodiment includes solid powder, a foaming agent, and an alkali activator. The solid powder contains 50% iron tailings and 50% slag by mass. The alkali activator contains 40% calcium carbide slag and 110% water by mass of the iron tailings. The foaming agent contains 0.6% hydrogen peroxide by mass of the iron tailings, with analytical purity and a mass percentage of 30%. The solid SDS contains 0.6% SDS by mass of the iron tailings.

[0058] During preparation, 50g of iron tailings and 50g of slag were weighed and mixed evenly to obtain powder A. 0.3g of SDS (sodium dodecyl sulfate) was weighed and dissolved in 55g of water. After complete dissolution, 20g of carbide slag was added and stirred evenly, and then allowed to stand for 1 minute to obtain an alkali activator. Powder A and the alkali activator were mixed and stirred for 3 minutes to obtain slurry B. 0.3ml of hydrogen peroxide was added to slurry B and mixed and stirred for 1-2 minutes to obtain slurry C. The slurry C was poured into a rubber mold for casting. After solidification, the sample was obtained. The sample and mold were sealed and cured at room temperature for 24 hours, and then placed in an oven for 6 hours. After the green body was formed, it was cured at room temperature for 14 days until demolding.

[0059] Example 4:

[0060] The porous geopolymer material in this embodiment includes solid powder, foaming agent, and alkali activator; the solid powder contains 50% iron tailings by mass and 50% slag by mass; the alkali activator contains 40% calcium carbide slag by mass and 140% water by mass; the foaming agent contains 1% hydrogen peroxide by mass of iron tailings, with analytical purity and a mass percentage of 30%; and solid SDS contains 0.6% solid SDS by mass of iron tailings.

[0061] During preparation, 50g of iron tailings and 50g of slag were weighed and mixed evenly to obtain powder A. 0.3g of SDS (sodium dodecyl sulfate) was weighed and dissolved in 70g of water. After complete dissolution, 20g of carbide slag was added and stirred evenly, and then allowed to stand for 1 minute to obtain an alkali activator. Powder A and the alkali activator were mixed and stirred for 3 minutes to obtain slurry B. 0.5ml of hydrogen peroxide was added to slurry B and mixed and stirred for 1-2 minutes to obtain slurry C. The slurry C was poured into a rubber mold for casting. After solidification, the sample was obtained. The sample and the mold were sealed and cured at room temperature for 24 hours, and then placed in an oven for 6 hours. After the green body was formed, it was cured at room temperature for 14 days until demolding.

[0062] Example 5:

[0063] The porous geopolymer of this embodiment includes solid powder, foaming agent, and alkali activator; the solid powder contains 50% iron tailings by mass and 50% slag by mass; the alkali activator contains 50% calcium carbide slag by mass and 110% water by mass; the foaming agent contains 0.6% hydrogen peroxide by mass of iron tailings, with analytical purity and a mass percentage of 30%; and solid SDS contains 0.6% solid SDS by mass of iron tailings.

[0064] During preparation, 50g of iron tailings and 50g of slag were weighed and mixed evenly to obtain powder A. 0.3g of SDS (sodium dodecyl sulfate) was weighed and dissolved in 55g of water. After complete dissolution, 25g of carbide slag was added and stirred evenly, and then allowed to stand for 1min to obtain an alkali activator. Powder A and the alkali activator were mixed and stirred for 3min to obtain slurry B. 0.3ml of hydrogen peroxide was added to slurry B and mixed and stirred for 1-2min to obtain slurry C. The slurry C was poured into a rubber mold for casting. After solidification, the sample was obtained. The sample and mold were sealed and cured at room temperature for 24h, and then placed in an oven for 6h. After the green body was formed, it was cured at room temperature for 14 days until demolding.

[0065] Example 6:

[0066] The porous geopolymer of this embodiment includes solid powder, foaming agent, and alkali activator; the solid powder contains 50% iron tailings and 50% slag by mass; the alkali activator contains 50% calcium carbide slag and 110% water by mass of iron tailings; the foaming agent contains 1% hydrogen peroxide by mass of iron tailings, with analytical purity and a mass percentage of 30%; and solid SDS contains 0.6% iron tailings by mass.

[0067] During preparation, 50g of iron tailings and 50g of slag were weighed and mixed evenly to obtain powder A. 0.3g of SDS (sodium dodecyl sulfate) was weighed and dissolved in 55g of water. After complete dissolution, 25g of carbide slag was added and stirred evenly, and then allowed to stand for 1min to obtain an alkali activator. Powder A and the alkali activator were mixed and stirred for 3min to obtain slurry B. 0.5ml of hydrogen peroxide was added to slurry B and mixed and stirred for 1-2min to obtain slurry C. The slurry C was poured into a rubber mold for casting. After solidification, the sample was obtained. The sample and mold were sealed and cured at room temperature for 24h, and then placed in an oven for 6h. After the green body was formed, it was cured at room temperature for 14 days until demolding.

[0068] Example 7:

[0069] The porous geopolymer of this embodiment includes solid powder, foaming agent, and alkali activator; the solid powder contains 30% iron tailings by mass and 70% slag by mass; the alkali activator contains 50% calcium carbide slag by mass and 110% water by mass; the foaming agent contains 1% hydrogen peroxide by mass of iron tailings, with analytical purity and a mass percentage of 30%; and solid SDS contains 0.6% solid SDS by mass of iron tailings.

[0070] During preparation, 30g of iron tailings and 70g of slag were weighed and mixed evenly to obtain powder A. 0.3g of SDS (sodium dodecyl sulfate) was weighed and dissolved in 55g of water. After complete dissolution, 20g of carbide slag was added and stirred evenly, and then allowed to stand for 1 minute to obtain an alkali activator. Powder A and the alkali activator were mixed and stirred for 3 minutes to obtain slurry B. 0.3ml of hydrogen peroxide was added to slurry B and mixed and stirred for 1-2 minutes to obtain slurry C. The slurry C was poured into a rubber mold for casting. After solidification, the sample was obtained. The sample and mold were sealed and cured at room temperature for 24 hours, and then placed in an oven for 6 hours. After the green body was formed, it was cured at room temperature for 14 days until demolding.

[0071] Example 8:

[0072] The porous geopolymer of this embodiment includes solid powder, foaming agent, and alkali activator; the solid powder contains 70% iron tailings by mass and 30% slag by mass; the alkali activator contains 50% calcium carbide slag by mass and 110% water by mass; the foaming agent contains 1% hydrogen peroxide by mass of iron tailings, with analytical purity and a mass percentage of 30%; and solid SDS contains 0.6% solid SDS by mass of iron tailings.

[0073] During preparation, 70g of iron tailings and 30g of slag were weighed and mixed evenly to obtain powder A. 0.3g of SDS (sodium dodecyl sulfate) was weighed and dissolved in 55g of water. After complete dissolution, 20g of carbide slag was added and stirred evenly, and then allowed to stand for 1 minute to obtain an alkali activator. Powder A and the alkali activator were mixed and stirred for 3 minutes to obtain slurry B. 0.3ml of hydrogen peroxide was added to slurry B and mixed and stirred for 1-2 minutes to obtain slurry C. The slurry C was poured into a rubber mold for casting. After solidification, the sample was obtained. The sample and mold were sealed and cured at room temperature for 24 hours, and then placed in an oven for 6 hours. After the green body was formed, it was cured at room temperature for 14 days until demolding.

[0074] Example 9:

[0075] The porous geopolymer of this embodiment includes solid powder, foaming agent, and alkali activator; the solid powder contains 50% iron tailings and 50% slag by mass; the alkali activator is sodium silicate with a modulus of 3.3; the amount of hydrogen peroxide in the foaming agent is 1% of the mass of iron tailings, with analytical purity and a mass percentage of 30%; the amount of solid SDS is 0.6% of the mass of iron tailings.

[0076] During preparation, 50g of iron tailings and 50g of slag were weighed and mixed evenly to obtain powder A. 0.3g of SDS (sodium dodecyl sulfate) was weighed and dissolved in 55g of water. After complete dissolution, 30g of sodium silicate was added and stirred evenly. After standing for 1 minute, an alkali activator was obtained. Powder A and the alkali activator were mixed and stirred for 3 minutes to obtain slurry B. 0.3ml of hydrogen peroxide was added to slurry B and mixed and stirred for 1-2 minutes to obtain slurry C. The slurry C was poured into a rubber mold for casting. After solidification, a sample was obtained. The sample was sealed with the mold and cured at room temperature for 24 hours, then placed in an oven for 6 hours. After the green body was formed, it was cured at room temperature for 14 days until demolding.

[0077] The mechanical properties of the porous geopolymers prepared in Examples 1-9 were tested, and the results are shown in Table 1.

[0078] Table 1. Test results of the mechanical properties of porous geopolymers obtained in Examples 1-9

[0079]

[0080] As shown in Table 1, the porous geopolymers prepared in each embodiment all exhibit high compressive strength. The principle behind this is that iron tailings and slag contain a large amount of active silica-alumina compounds. The main component of carbide slag is calcium oxide, which has strong alkalinity, acting as an alkali activator for the silica-alumina compounds, thus giving the samples high compressive strength. Simultaneously, hydrogen peroxide decomposes to generate bubbles, which are stabilized by SDS (sodium dodecyl sulfate), forming a stable porous structure, resulting in high compressive strength for the porous material. In Examples 7, 8, and 9, changing the ratio of iron tailings to slag reduced the compressive strength; using sodium silicate as an alkali activator provided only a limited increase in compressive strength.

[0081] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.

Claims

1. A multi-solid waste-based porous geopolymer material, characterized in that, The porous geopolymer material is composed of solid powder, alkali activator, and foaming agent; The solid powder consists of 30wt%~70wt% iron tailings and 30wt%~70wt% slag, with the sum of their weight percentages being 100%. The alkaline activator is a mixture of carbide slag and water. The amount of carbide slag accounts for 30%-60% of the mass of iron tailings, and the mass ratio of water to iron tailings is 1.4-1.1:

1. The foaming agent used to create the pores is a mixture of hydrogen peroxide and solid SDS, wherein the amount of hydrogen peroxide is 0.2%-1.2% of the iron tailings mass, and the amount of solid SDS is 0.6% of the iron tailings mass. The particle size of the iron tailings, slag, and calcium carbide slag is less than 0.075 mm. The iron tailings are waste residue discharged after iron ore has been processed to obtain iron concentrate. Based on a weight percentage of 100%, the mass percentages of each component in the iron tailings are: SiO2 30%~50%, Al2O3 10%~20%, Fe2O3 20%~30%, CaO 5%~10%, MgO 1%~3%, K2O 1%~3%, Na2O 1%~3%, TiO2 1%~2%, MnO 0.1%~0.5%, and its loss on ignition is 0.4%~1%. The slag is waste residue discharged during the pyrometallurgical smelting of pig iron in a blast furnace. The main components in the slag account for the following mass percentages: SiO2 30~35%, CaO 35~45%, Al2O3 15~20%, TiO2 1~5%, MgO 1~5%, Na2O 1~2%, K2O 0.1~0.5%, Fe2O3 0.1~0.5%. The calcium carbide slag is the waste residue generated after the hydrolysis of calcium carbide to prepare acetylene. The main components in the calcium carbide slag contain the following mass percentages: CaO 90~95%, SiO2 1~5%, Al2O3 0.5~1%, Cl 0.5~1%, Na2O 0.5~1%, F 0.5~1%, Fe2O3 0.1~0.5%, SO3 0.1~0.5%, and MgO 0.1~0.5%.

2. The multi-solid waste-based porous geopolymer material as described in claim 1, characterized in that, The hydrogen peroxide is of analytical grade and has a percentage content of 10% to 70%.

3. A method for preparing a multi-solid waste-based porous geopolymer material as described in any one of claims 1-2, characterized in that, Specifically, the steps include the following: Step S1: Mix iron tailings and slag evenly in a certain proportion to obtain solid powder A; Step S2: Dissolve SDS completely in water according to the ratio, then add carbide slag according to the ratio, stir and mix well, and let stand for a period of time to obtain the alkali activator. Step S3: Mix the obtained solid powder A with the alkali activator and mechanically stir for 2-4 minutes to obtain the mixed slurry B; Step S4: Add hydrogen peroxide to the mixed slurry B in proportion, and then mechanically stir for 1-2 minutes to obtain porous geopolymer slurry C; Step S5: Pour slurry C into the mold and seal it. Cure at room temperature for 24 hours, then place it in an oven for 6 hours. Cure the molded green body at room temperature for 14 days until demolding.

4. The method for preparing a multi-solid waste-based porous geopolymer material as described in claim 3, characterized in that, In the oven curing process described in step S5, the surface curing temperature of the mold and the specimen shall be controlled to be no higher than 60°C.

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