Fluid soil stabilizer based on industrial solid waste and preparation method thereof

Abstract

The invention provides a fluid soil stabilizer based on industrial solid waste and a preparation method thereof, and belongs to the technical field of fluid soil stabilizers. The fluid soil stabilizer comprises the following raw materials in percentage by mass: 40%-50% of electrolytic manganese residues, 20%-30% of phosphogypsum, 15%-25% of red mud and 8%-12% of an organic-inorganic composite exciting agent, wherein the organic-inorganic composite exciting agent comprises the following components in percentage by weight: 50%-70% of sulphoaluminate cement clinker, 20%-30% of polycarboxylic acid type super plasticizer and 10%-20% of rare earth oxide. The electrolytic manganese residues, the ardealite and the red mud are pretreated and then matched with the organic-inorganic composite exciting agent to prepare the fluid-state soil stabilizer, and the fluid-state soil stabilizer has good cementing performance, can be used for preparing fluid-state solidified soil and can replace cement and lime to be applied to roadbed improvement and treatment; the method has the characteristics of good sulfate corrosion resistance, high early strength and the like, solves the problems of low solid waste utilization rate, serious pollution, high storage cost and the like, and has wide application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of fluidized soil solidifiers, and in particular to a fluidized soil solidifier based on industrial solid waste and a preparation method thereof. Background Art

[0002] Every year, a vast number of infrastructure projects are undertaken, most of which involve excavation and backfilling. Some backfill projects involve narrow working areas in specialized areas (such as underground cavities, pipelines, and foundation pits), making heavy machinery impractical for compaction. This results in dead angles or blind spots at the interface between the backfill material and the structure. This requires large quantities of self-compacting, self-hardening fluidized soil as filler to fill these gaps. Cement is a commonly used curing agent in fluidized soil, but its production process consumes significant amounts of natural resources such as limestone, clay, and coal, and produces large amounts of pollutants such as dust and carbon dioxide, severely hindering the sustainable development of a green, circular economy.

[0003] While existing research has proposed improvements to the utilization of industrial solid waste, only a handful have truly achieved industrial application. Given the low utilization rate, severe pollution, and high storage costs of these solid wastes, maximizing the efficiency of solid waste utilization is imperative. Summary of the Invention

[0004] To address the shortcomings of the above-mentioned existing technologies, the present invention provides a fluidized soil solidifier based on industrial solid waste and its preparation method. The fluidized soil solidifier, which uses electrolytic manganese slag, phosphogypsum, and red mud as its main raw materials, is used to prepare fluidized solidified soil, demonstrating technical feasibility and outstanding economic and environmental benefits.

[0005] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0006] The present invention provides a fluid soil solidifier based on industrial solid waste, comprising the following raw materials in percentage by mass: 40% to 50% electrolytic manganese slag, 20% to 30% phosphogypsum, 15% to 25% red mud, and 8% to 12% organic-inorganic composite activator;

[0007] The organic-inorganic composite activator comprises the following components in percentage by mass: 50% to 70% of sulphoaluminate cement clinker, 20% to 30% of polycarboxylic acid superplasticizer, and 10% to 20% of rare earth oxide.

[0008] The present invention compounds sulfoaluminate cement clinker, polycarboxylic acid superplasticizer, and rare earth oxide in a specific proportion as an activator. Among them, the inorganic part can destroy the mineral phase structure through alkali excitation or sulfate excitation, release active ions, hydrate the calcium-containing active components into amorphous gel, and bond the incompletely reacted inert particles; the organic part can stabilize the active intermediates through chelation, reduce the reaction energy barrier, and accelerate the hydration process; the inorganic part and the organic part achieve a balance between activity excitation, structural strengthening, and environmental protection and economy through the "chemical-physical" synergistic effect, and significantly improve the performance of solid waste-based cementitious materials.

[0009] Preferably, the rare earth oxide includes but is not limited to at least one of yttrium oxide, lanthanum oxide, and cerium oxide.

[0010] The present invention also provides a method for preparing the fluidized soil solidifying agent based on industrial solid waste, comprising the following steps:

[0011] Electrolytic manganese slag, phosphogypsum and red mud are pretreated respectively; 40%-50% of the pretreated electrolytic manganese slag, 20%-30% of the pretreated phosphogypsum and 15%-25% of the pretreated red mud are weighed, water is added according to a water-binder ratio of 0.3 and mixed evenly, and then an organic-inorganic composite activator is added and mixed evenly to obtain a fluid soil solidifier based on industrial solid waste.

[0012] Preferably, the step of pre-treating the electrolytic manganese slag includes drying the electrolytic manganese slag, performing an irradiation activation treatment, and crushing and drying to obtain pre-treated electrolytic manganese slag. Drying the electrolytic manganese slag to remove free moisture can improve the absorption efficiency of the subsequent microwave irradiation activation treatment.

[0013] Preferably, the irradiation activation treatment is carried out in a microwave reactor with an irradiation power of 500-1000 W and an irradiation frequency of 2-3 GHz.

[0014] Preferably, the step of pretreating the phosphogypsum includes: drying the phosphogypsum to remove free water and part of the crystallization water, calcining the phosphogypsum, cooling, crushing and drying to obtain pretreated phosphogypsum.

[0015] Preferably, the phosphogypsum is calcined at a temperature of 600-800°C for 2-4 hours. During the calcination process, a suitable modifier (e.g., potassium aluminum sulfate, lime, fly ash) may be added to regulate the activity and stability of the phosphogypsum.

[0016] Preferably, the step of pretreating the red mud includes: drying the red mud, removing free water, placing it in an acid solution under heating conditions for pickling reaction, during which the acid solution can dissolve soluble metal oxides such as aluminum and iron in the red mud, while reducing the alkalinity and heavy metal content of the red mud; after the pickling reaction is completed, filtering and washing with water to neutrality, roasting and activating the washed red mud, and crushing and drying to obtain pretreated red mud.

[0017] Preferably, the acid solution is 0.1-2 M sulfuric acid or hydrochloric acid.

[0018] Preferably, the temperature of the pickling reaction is 60-90° C., and the time is 1-3 h.

[0019] Preferably, the calcination temperature is 500-800° C. and the calcination time is 2-4 h.

[0020] Preferably, the pulverization is performed using a jet mill at a pressure of 0.6-1.0 MPa, capable of achieving submicron-level pulverization of electrolytic manganese slag, phosphogypsum, or red mud. After pulverization, the resulting powdered electrolytic manganese slag has a particle size of 0.1-1 μm, the resulting powdered phosphogypsum has a particle size of 0.2-2 μm, and the resulting powdered red mud has a particle size of 0.5-5 μm, achieving submicron-level dispersion.

[0021] Preferably, the moisture content of the pretreated electrolytic manganese slag, the pretreated phosphogypsum and the pretreated red mud is ≤5%.

[0022] The present invention also provides application of the fluidized soil solidifier based on industrial solid waste in fluidized solidified soil.

[0023] Preferably, the mixing ratio of the fluid soil solidifier based on industrial solid waste is 10% to 30%, which can be flexibly adjusted according to the soil moisture content of the construction site and the construction requirements.

[0024] Compared with the prior art, the present invention is beneficial in that:

[0025] The present invention uses electrolytic manganese slag, phosphogypsum, and red mud as the main raw materials, pre-treats them separately, and then prepares a fluidized soil solidifier by combining them with an organic-inorganic composite activator. The obtained fluidized soil solidifier has good cementing properties and is used to prepare fluidized solidified soil. It can replace cement and lime in roadbed improvement and treatment, and has the characteristics of good sulfate erosion resistance and high early strength. At the same time, the present invention uses a large amount of solid waste, which can reduce the landfill and incineration of waste, reduce pollution to land and air, and reduce environmental pressure; it can also reduce the mining and consumption of primary resources, thereby saving limited natural resources. The present invention promotes the resource utilization of electrolytic manganese slag, phosphogypsum, and red mud solid waste, and has broad and far-reaching significance. DETAILED DESCRIPTION

[0026] The technical solutions of the present invention are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] The present invention provides a fluid soil solidifier based on industrial solid waste, comprising the following raw materials in percentage by mass: 40% to 50% electrolytic manganese slag, 20% to 30% phosphogypsum, 15% to 25% red mud, and 8% to 12% organic-inorganic composite activator;

[0028] The organic-inorganic composite activator comprises the following components in percentage by mass: 50% to 70% of sulphoaluminate cement clinker, 20% to 30% of polycarboxylic acid superplasticizer, and 10% to 20% of rare earth oxide.

[0029] In some examples, the rare earth oxide includes but is not limited to at least one of yttrium oxide, lanthanum oxide, and cerium oxide.

[0030] The method for preparing the fluidized soil solidifying agent based on industrial solid waste comprises the following steps:

[0031] Electrolytic manganese slag, phosphogypsum and red mud are pretreated respectively; 40%-50% of the pretreated electrolytic manganese slag, 20%-30% of the pretreated phosphogypsum and 15%-25% of the pretreated red mud are weighed, water is added according to a water-binder ratio of 0.3 and mixed evenly, and then an organic-inorganic composite activator is added and mixed evenly to obtain a fluid soil solidifier based on industrial solid waste.

[0032] In some examples, the step of pretreating the electrolytic manganese slag includes: drying the electrolytic manganese slag, then irradiating the slag in a microwave reactor for activation at an irradiation power of 500-1000 W and an irradiation frequency of 2-3 GHz; and crushing and drying the slag to obtain pretreated electrolytic manganese slag. Drying the slag to remove free moisture can improve absorption efficiency during subsequent microwave irradiation activation.

[0033] In some examples, the step of pretreating the phosphogypsum includes drying the phosphogypsum to remove free water and some crystalline water, calcining the phosphogypsum at 600-800°C for 2-4 hours, cooling, crushing, and drying to obtain pretreated phosphogypsum. During the calcination process, a modifier (e.g., lime or fly ash) may be added to adjust the activity and stability of the phosphogypsum.

[0034] In some examples, the steps of pretreating the red mud include: drying the red mud, removing free water, placing it in a 0.1~2 M sulfuric acid or hydrochloric acid solution at 60~90°C for an acid wash reaction for 1~3 hours. During the acid wash reaction, the acid solution can dissolve soluble metal oxides such as aluminum and iron in the red mud, and at the same time reduce the alkalinity and heavy metal content of the red mud; after the acid wash reaction is completed, filtering and washing with water to neutrality, calcining and activating the washed red mud at 500~800°C for 2~4 hours, and then crushing and drying to obtain pretreated red mud.

[0035] In some examples, the pulverization is performed using a jet mill at a pressure of 0.6-1.0 MPa, enabling submicron-level pulverization of electrolytic manganese slag, phosphogypsum, or red mud. After pulverization, the resulting powdered electrolytic manganese slag has a particle size of 0.1-1 μm, the resulting powdered phosphogypsum has a particle size of 0.2-2 μm, and the resulting powdered red mud has a particle size of 0.5-5 μm, achieving submicron-level dispersion.

[0036] In some examples, the moisture content of the pretreated electrolytic manganese slag, the pretreated phosphogypsum, and the pretreated red mud is ≤5%.

[0037] In some examples, the fluidized soil solidifier based on industrial solid waste is used to prepare fluidized solidified soil, and its mixing ratio is 10% to 30%.

[0038] In the following specific examples, the sulphoaluminate cement clinker was purchased from Hebei Gunate Building Materials Co., Ltd.; the polycarboxylic acid superplasticizer was purchased from Jiangsu Subote New Materials Co., Ltd.

[0039] In the following specific examples, the soil used is shale soil, and its basic performance parameters are shown in Table 1.

[0040] Table 1: Basic performance parameters of shale soil

[0041]

[0042] Example 1

[0043] A fluid soil solidifier based on industrial solid waste, the preparation method comprising the following steps:

[0044] (1) After drying the electrolytic manganese slag, the irradiation activation treatment is performed in a microwave reactor for standby use; the irradiation power is 800 W and the irradiation frequency is 2.45 GHz;

[0045] The phosphogypsum was dried to remove free water and part of the crystal water, and then calcined at 700 °C for 3 h, cooled and set aside;

[0046] After drying and removing free water, the red mud was acid-washed in a 1 M hydrochloric acid solution at 80°C for 1 h. The residue was then filtered and washed with water until neutral. The washed red mud was then calcined and activated at 600°C for 3 h, cooled, and set aside. The main chemical compositions of the pretreated electrolytic manganese slag, phosphogypsum, and red mud are shown in Table 2.

[0047] Table 2: Main chemical compositions of electrolytic manganese slag, phosphogypsum and red mud after pretreatment

[0048]

[0049] (2) The electrolytic manganese slag, phosphogypsum and red mud obtained in step (1) are crushed separately using a jet mill (pressure of 0.8 MPa), and are placed in an oven for drying to obtain pretreated electrolytic manganese slag, phosphogypsum and red mud.

[0050] (3) Weigh 45% of the pretreated electrolytic manganese slag, 20% of the pretreated phosphogypsum and 25% of the pretreated red mud, add water according to a water-binder ratio of 0.3 and mix them evenly.

[0051] (4) Then, 10% of an organic-inorganic composite activator (the components of the organic-inorganic composite activator are: 50% sulfoaluminate cement clinker, 30% polycarboxylic acid superplasticizer, and 20% yttrium oxide) is added and mixed evenly to obtain a fluid soil solidifier based on industrial solid waste.

[0052] Example 2

[0053] A fluid soil solidifier based on industrial solid waste, the preparation method comprising the following steps:

[0054] (1) After drying the electrolytic manganese slag, the irradiation activation treatment is performed in a microwave reactor for standby use; the irradiation power is 800 W and the irradiation frequency is 2.45 GHz;

[0055] The phosphogypsum was dried to remove free water and part of the crystal water, and then calcined at 700 °C for 3 h, cooled and set aside;

[0056] The red mud was dried to remove free water, and then placed in a 1 M hydrochloric acid solution for acid washing at 80 °C for 1 h. It was then filtered and washed with water until neutral. The washed red mud was calcined and activated at 600 °C for 3 h, cooled, and set aside.

[0057] (2) The electrolytic manganese slag, phosphogypsum and red mud obtained in step (1) are crushed separately using a jet mill (pressure of 0.8 MPa), and are placed in an oven for drying to obtain pretreated electrolytic manganese slag, phosphogypsum and red mud.

[0058] (3) Weigh 45% of the pretreated electrolytic manganese slag, 25% of the pretreated phosphogypsum and 20% of the pretreated red mud, add water according to a water-binder ratio of 0.3 and mix them evenly.

[0059] (4) Then, 10% of an organic-inorganic composite activator (the components of the organic-inorganic composite activator are: 70% sulfoaluminate cement clinker, 20% polycarboxylic acid superplasticizer, and 10% yttrium oxide) is added and mixed evenly to obtain a fluid soil solidifier based on industrial solid waste.

[0060] Example 3

[0061] A fluid soil solidifier based on industrial solid waste, the preparation method comprising the following steps:

[0062] (1) After drying the electrolytic manganese slag, the irradiation activation treatment is performed in a microwave reactor for standby use; the irradiation power is 800 W and the irradiation frequency is 2.45 GHz;

[0063] The phosphogypsum was dried to remove free water and part of the crystal water, and then calcined at 700 °C for 3 h, cooled and set aside;

[0064] The red mud was dried to remove free water, and then placed in a 1 M hydrochloric acid solution for acid washing at 80 °C for 1 h. It was then filtered and washed with water until neutral. The washed red mud was calcined and activated at 600 °C for 3 h, cooled, and set aside.

[0065] (2) The electrolytic manganese slag, phosphogypsum and red mud obtained in step (1) are crushed separately using a jet mill (pressure of 0.8 MPa), and are placed in an oven for drying to obtain pretreated electrolytic manganese slag, phosphogypsum and red mud.

[0066] (3) Weigh 45% of the pretreated electrolytic manganese slag, 30% of the pretreated phosphogypsum, and 15% of the pretreated red mud, add water at a water-binder ratio of 0.3 and mix well.

[0067] (4) Then, 10% of an organic-inorganic composite activator (the components of the organic-inorganic composite activator are: 60% sulfoaluminate cement clinker, 25% polycarboxylic acid superplasticizer, and 15% yttrium oxide) is added and mixed evenly to obtain a fluid soil solidifier based on industrial solid waste.

[0068] Example 4

[0069] A fluid soil solidifier based on industrial solid waste, the preparation method comprising the following steps:

[0070] (1) After drying the electrolytic manganese slag, the irradiation activation treatment is performed in a microwave reactor for standby use; the irradiation power is 800 W and the irradiation frequency is 2.45 GHz;

[0071] After drying the phosphogypsum and removing free water and part of the crystal water, potassium aluminum sulfate (0.2% by weight of the phosphogypsum) was added and mixed evenly, and calcined at 700 °C for 3 h, cooled, and set aside;

[0072] The red mud was dried to remove free water, and then placed in a 1 M hydrochloric acid solution for acid washing at 80 °C for 1 h. It was then filtered and washed with water until neutral. The washed red mud was calcined and activated at 600 °C for 3 h, cooled, and set aside.

[0073] (2) The electrolytic manganese slag, phosphogypsum and red mud obtained in step (1) are crushed separately using a jet mill (pressure of 0.8 MPa), and are placed in an oven for drying to obtain pretreated electrolytic manganese slag, phosphogypsum and red mud.

[0074] (3) Weigh 45% of the pretreated electrolytic manganese slag, 20% of the pretreated phosphogypsum and 25% of the pretreated red mud, add water according to a water-binder ratio of 0.3 and mix them evenly.

[0075] (4) Then, 10% of an organic-inorganic composite activator (the components of the organic-inorganic composite activator are: 50% sulfoaluminate cement clinker, 30% polycarboxylic acid superplasticizer, and 20% yttrium oxide) is added and mixed evenly to obtain a fluid soil solidifier based on industrial solid waste.

[0076] Comparative Example 1

[0077] A fluid soil solidifier, the preparation method of which is substantially the same as that of Example 1, except that step (4) is: then adding 10% of an organic-inorganic composite activator (the components of the organic-inorganic composite activator are: 70% of sulfoaluminate cement clinker and 30% of a polycarboxylic acid superplasticizer) and mixing evenly to obtain a fluid soil solidifier.

[0078] Comparative Example 2

[0079] A fluid soil solidifier, the preparation method of which is substantially the same as that of Example 1, except that step (4) is: then adding 10% of an organic-inorganic composite activator (the components of the organic-inorganic composite activator are: 80% of sulfoaluminate cement clinker and 20% of yttrium oxide) and stirring evenly to obtain a fluid soil solidifier.

[0080] Comparative Example 3

[0081] A fluid soil solidifying agent, the preparation method comprises the following steps:

[0082] (1) Electrolytic manganese slag, phosphogypsum and red mud were pulverized separately using a jet mill (pressure of 0.8 MPa) and dried in an oven to obtain powdered electrolytic manganese slag, phosphogypsum and red mud;

[0083] The main chemical components of the powdered electrolytic manganese slag include: SiO2 31.7%, SO3 22.4%, Fe2O36%, Al2O3 6.7%, MnO 3.5%, and CaSO4 27%;

[0084] The main chemical components of the powdered phosphogypsum include: CaSO4 90%, SiO2 5.6%, P2O5 1.2%, Al2O3 0.6%, Fe2O3 0.2%, MgO 0.4%;

[0085] The main chemical components of the powdered red mud include: Al2O3 26.8%, SiO2 19.6%, Fe2O3 24.3%, CaO 18.4%, Na2O 5.2%, and TiO2 4.1%.

[0086] (2) Weigh 45% of powdered electrolytic manganese slag, 20% of phosphogypsum, and 25% of red mud, add water at a water-binder ratio of 0.3 and mix well.

[0087] (3) Then add 10% of organic-inorganic composite activator (the components of the organic-inorganic composite activator are: 50% of sulfoaluminate cement clinker, 30% of polycarboxylic acid superplasticizer, and 20% of yttrium oxide) and mix evenly to obtain a fluid soil solidifier.

[0088] The fluidized soil solidifiers of Examples 1 to 3 and Comparative Examples 1 to 3 were added to shale soil at a dosage of 16% to prepare solidified soil. Test specimens were formed and cured according to the 7-day unconfined compressive strength test method for inorganic binders T0805-2024 in JTG 3441-2024 "Test Procedure for Stabilized Materials of Inorganic Binders for Highway Engineering". After curing, the technical indicators were measured. The test results are shown in Table 3.

[0089] Table 3: Unconfined compressive strength test results of fluidized solidified soil

[0090]

[0091] As shown in Table 3, the fluidized soil solidifier provided by the present invention, which uses electrolytic manganese slag, phosphogypsum and red mud as main raw materials, has good cementing properties. Using it to prepare fluidized solidified soil has technical feasibility and outstanding economic and environmental benefits.

[0092] In addition, the fluidized soil solidifiers of Examples 1 to 3 were added to shale soil at a dosage of 16% to prepare solidified soil. The solidified soil was immersed in a 5% Na2SO4 solution for 28 days. The corrosion resistance coefficient K was greater than 0.92, and the strength drop did not exceed 8%, indicating that the solidified soil prepared using the solidifier of the present invention has good resistance to sulfate erosion and can meet the use requirements of most harsh environments.

[0093] In summary, the fluidized soil solidifier of the present invention comprises the following raw materials in percentage by mass: 40% to 50% electrolytic manganese slag, 20% to 30% phosphogypsum, 15% to 25% red mud, and 8% to 12% organic-inorganic composite activator; wherein the organic-inorganic composite activator comprises 50% to 70% sulfoaluminate cement clinker, 20% to 30% polycarboxylic acid superplasticizer, and 10% to 20% rare earth oxide. The present invention prepares the fluidized soil solidifier by pre-treating the electrolytic manganese slag, phosphogypsum, and red mud separately and then combining them with the organic-inorganic composite activator. The resulting fluidized soil solidifier has excellent cementing properties and can be used to prepare fluidized solidified soil. It can replace cement and lime in roadbed improvement and treatment, has good sulfate erosion resistance and high early strength, and solves the problems of low solid waste utilization, severe pollution, and high storage costs, and has broad application prospects.

[0094] The above specific embodiments describe the implementation of the present invention in detail, but the present invention is not limited to the specific details of the above embodiments. Within the scope of the claims and technical concept of the present invention, various simple modifications and changes can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

Claims

1. A fluid soil solidifier based on industrial solid waste, characterized in that: The method comprises the following raw materials in percentage by mass: 40% to 50% electrolytic manganese slag, 20% to 30% phosphogypsum, 15% to 25% red mud, and 8% to 12% organic-inorganic composite activator; wherein the organic-inorganic composite activator comprises the following components in percentage by mass: 50% to 70% sulphoaluminate cement clinker, 20% to 30% polycarboxylic acid superplasticizer, and 10% to 20% rare earth oxide.

2. The fluid soil solidifying agent based on industrial solid waste according to claim 1, characterized in that: The rare earth oxide includes but is not limited to at least one of yttrium oxide, lanthanum oxide, and cerium oxide.

3. The method for preparing a fluid soil solidifying agent based on industrial solid waste according to claim 1 or 2, characterized in that: The following steps are involved: Electrolytic manganese slag, phosphogypsum and red mud are pretreated respectively; 40%-50% of the pretreated electrolytic manganese slag, 20%-30% of the pretreated phosphogypsum and 15%-25% of the pretreated red mud are weighed, water is added and mixed evenly, and then an organic-inorganic composite activator is added and mixed evenly to obtain a fluid soil solidifier based on industrial solid waste.

4. The method for preparing a fluidized soil solidifying agent based on industrial solid waste according to claim 3, characterized in that: The step of pre-treating the electrolytic manganese slag comprises: drying the electrolytic manganese slag, performing irradiation activation treatment, crushing and drying to obtain pre-treated electrolytic manganese slag; The step of pre-treating the phosphogypsum comprises: drying the phosphogypsum, calcining the phosphogypsum, cooling, crushing and drying the phosphogypsum to obtain pre-treated phosphogypsum; The steps of pre-treating the red mud include: drying the red mud, placing it in an acid solution under heating conditions to carry out an acid washing reaction, filtering and washing after the acid washing reaction is completed; roasting the washed red mud, crushing and drying it to obtain pre-treated red mud.

5. The method for preparing a fluidized soil solidifying agent based on industrial solid waste according to claim 4, characterized in that: When the electrolytic manganese slag is pretreated, the irradiation activation treatment is carried out in a microwave reactor with an irradiation power of 500-1000 W and an irradiation frequency of 2-3 GHz.

6. The method for preparing a fluidized soil solidifying agent based on industrial solid waste according to claim 4, characterized in that: When the phosphogypsum is pretreated, the calcination temperature is 600-800° C. and the time is 2-4 h.

7. The method for preparing a fluidized soil solidifying agent based on industrial solid waste according to claim 4, characterized in that: When the phosphogypsum is pretreated, during the calcination process, an appropriate amount of modifier is added to regulate the activity and stability of the phosphogypsum, and the modifier includes but is not limited to potassium aluminum sulfate, lime or fly ash.

8. The method for preparing a fluidized soil solidifying agent based on industrial solid waste according to claim 4, characterized in that: When the red mud is pretreated, the acid washing reaction temperature is 60-90° C. and the time is 1-3 h.

9. The method for preparing a fluidized soil solidifying agent based on industrial solid waste according to claim 4, characterized in that: When the red mud is pretreated, the calcination temperature is 500-800°C and the calcination time is 2-4 hours.

10. Use of the fluidized soil solidifier based on industrial solid waste according to claim 1 or 2 in fluidized solidified soil.

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