Environment-friendly efficient solidification and stabilization agent for calcium fluoride sludge and preparation method thereof

Abstract

The invention discloses a calcium fluoride sludge environment-friendly efficient curing and stabilizing agent and a preparation method thereof. The calcium fluoride sludge environment-friendly efficient curing and stabilizing agent comprises the following raw materials in parts by weight: 20-30 parts of a chemical stabilizing agent, 60-70 parts of an inorganic curing agent, 1-5 parts of a microwave dehydration auxiliary agent and 2-5 parts of a pH regulator. The calcium fluoride sludge treatment agent has the advantage of good treatment effect, and solves the problems that in the preparation process of an existing calcium fluoride sludge treatment agent, the treatment effect on calcium fluoride sludge is poor, harmful substances and pollutants in the calcium fluoride sludge easily permeate into underground water or soil, environment pollution is caused, and the treatment effect is poor. And moreover, the treated sludge is treated or utilized if not reaching the environmental protection standard, so that harmful substances are released again in the use process, and secondary pollution is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of material recycling, and in particular to an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent and a preparation method thereof. Background Art

[0002] Environmentally friendly and efficient solidification and stabilization agents for calcium fluoride sludge are specialized agents that solidify or stabilize harmful components in calcium fluoride sludge through chemical or physical methods. These agents effectively reduce the risk of fluoride and other harmful substances leaching from the sludge, improve sludge stability, and achieve resource utilization. These environmentally friendly and efficient solidification and stabilization agents for calcium fluoride sludge include inorganic solidifiers and chemical stabilizers. Chemical stabilizers react with pollutants in calcium fluoride sludge to form a stable precipitate, while solidifiers fix the harmful components in the sludge within a stable mineral structure through physical encapsulation or chemical reactions.

[0003] During the preparation process of existing calcium fluoride sludge treatment agents, the treatment effect on calcium fluoride sludge is poor. Harmful substances and pollutants in calcium fluoride sludge can easily seep into groundwater or soil, causing environmental pollution. Moreover, if the treated sludge does not meet environmental protection standards and is disposed of or utilized, harmful substances will be released again during use, causing secondary pollution. Summary of the Invention

[0004] The object of the present invention is to provide an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent and a preparation method thereof, which has the advantage of good treatment effect and solves the problem that the existing calcium fluoride sludge treatment agent has poor treatment effect on calcium fluoride sludge during the preparation process, and harmful substances and pollutants in the calcium fluoride sludge easily seep into groundwater or soil, causing environmental pollution. In addition, the treated sludge is disposed of or used if it does not meet environmental protection standards, which will lead to the release of harmful substances during use, causing secondary pollution.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent, comprising the following raw materials in parts by weight:

[0006] 20-30 parts of chemical stabilizing agent, 60-70 parts of inorganic curing agent, 1-5 parts of microwave dehydration auxiliary agent, and 2-5 parts of pH regulator.

[0007] A method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent comprises the following steps:

[0008] S1. Raw material preparation: 1 part of chemical stabilization agent includes 0.6 parts of polyphosphate scale inhibitor, 0.2 parts of chelating agent and 0.2 parts of dispersant; 1 part of inorganic curing agent includes 0.5 parts of cement, 0.3 parts of fly ash and 0.2 parts of shale particles;

[0009] S2. Pretreatment of calcium fluoride sludge: Pour the calcium fluoride sludge and microwave dehydration aid into a stirring dehydrator, wherein the microwave dehydration aid is magnesium sulfate. The stirring dehydrator first stirs and mixes the calcium fluoride sludge and the microwave dehydration aid, and then centrifuges and dehydrates the mixture after the mixing is completed.

[0010] S3. Microwave heating: The dehydrated calcium fluoride sludge is transported to a spiral microwave heating device. During the spiral transportation process, the calcium fluoride sludge is heated by microwaves to dry the water content of the calcium fluoride sludge to 30-40%. The magnesium sulfate dehydrating agent helps the calcium fluoride sludge absorb microwave energy and effectively converts this energy into heat energy, thereby accelerating the evaporation rate of the water in the calcium fluoride sludge.

[0011] S4. Chemical stabilization treatment: Pour the dried calcium fluoride sludge and chemical stabilization agent solution into the reaction tank and stir and mix for 10-40 minutes. The polyphosphate scale inhibitor forms a stable complex with the calcium ions in the calcium fluoride sludge, thereby reducing the solubility of calcium fluoride. The chelating agent combines with the heavy metal ions in the calcium fluoride sludge to form a soluble chelate. The dispersant disperses the particulate matter in the calcium fluoride sludge to improve the chemical treatment effect.

[0012] S5. Solidification treatment: The chemically treated calcium fluoride sludge and the inorganic solidifying agent are stirred and mixed. Water is added during the mixing process. The water and cement react to form calcium silicate hydrates to encapsulate and fix harmful substances in the sludge. The fly ash reacts with the calcium silicate hydrates to enhance the overall performance of the mixture. The shale particles optimize the pore structure within the mixture, ultimately forming a recyclable mixture.

[0013] S6, aging and sintering, the mixture is piled and aged for 12-36 hours to promote the formation of silicate minerals. After the aging is completed, the mixture is pressed into a green body, and the green body is sent to a sintering device and sintered into a blank at a high temperature of 1000-1200°C;

[0014] S7. Utilization of building materials: Cool the sintered blanks, use air cooling equipment to gradually cool the blanks during cooling, and then process the cooled blanks into building materials.

[0015] As a preferred method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent of the present invention, in S1, when preparing one portion of the chemical stabilization agent, the polyphosphate scale inhibitor, the chelating agent and the dispersant are weighed in proportion, and the weighed polyphosphate scale inhibitor, the chelating agent and the dispersant are stirred and mixed so that all the ingredients are evenly mixed together.

[0016] As a preferred method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent of the present invention, in S1, when preparing one part of the inorganic solidifying agent, cement, fly ash and shale particles are weighed in proportion, and the weighed cement, fly ash and shale particles are stirred and mixed so that all the components are evenly mixed together.

[0017] As a preferred method for preparing an environmentally friendly and efficient solidification and stabilization agent for calcium fluoride sludge of the present invention, the stirring dehydrator in S2 includes a feeding system, a stirring system, a dehydration system and a discharging system. The feeding system conveys the calcium fluoride sludge and the microwave dehydration aid to the stirring system. The stirring system stirs and mixes the calcium fluoride sludge and the microwave dehydration aid through multiple stirring blade assemblies. After the mixing is completed, the mixture enters the dehydration system. The dehydration system dehydrates the mixture through a high-efficiency rotating centrifugal drum. The dehydrated mixture enters the discharging system. The discharging system conveys the mixture to the spiral microwave heating equipment and conveys the separated wastewater to the sewage treatment equipment.

[0018] As a preferred method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent of the present invention, the spiral microwave heating equipment in S3 includes a spiral conveying system, a microwave generator, a heating chamber and an exhaust gas treatment system. The spiral conveying system is composed of one or more spiral blades and is installed in the heating chamber. The heating chamber is a closed cylindrical structure. During the operation of the spiral conveying system, the mixture moves slowly inside the heating chamber. During the movement, the microwave generator emits microwave energy to the mixture. The microwave energy interacts with the water molecules in the mixture to heat the material. The generated water vapor enters the exhaust gas treatment system. The exhaust gas treatment system first condenses the water vapor and then purifies the exhaust gas and wastewater separately.

[0019] As a preferred method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent of the present invention, after chemical treatment in S4, the treated mixed slurry is introduced into a sedimentation tank to allow solid particles to naturally settle to the bottom, and the supernatant at the top is extracted for further treatment. Then, a sludge pump is used to extract the precipitated solid particles for dehydration. The dehydration equipment is a plate and frame filter press. After dehydration, calcium fluoride sludge blocks are formed. After dehydration, the calcium fluoride sludge blocks are processed using a crushing device to break the calcium fluoride sludge blocks into calcium fluoride sludge particles.

[0020] Preferably, after the preparation of the mixture in S5 is completed, the mixture is ground, the mixture is conveyed into a ball mill, the ball mill grinds the large particles in the mixture through grinding balls inside the ball mill, after grinding is completed, the mixture is conveyed into a vibrating screen, the large particles in the mixture are screened, the screened large particles are returned to the ball mill for secondary grinding, the mixture after secondary grinding is screened, and finally the mixture after multiple screening is stirred and mixed for subsequent processing.

[0021] Preferably, when aging in S6, the aging temperature is 40-60 DEG C, the humidity is 70-90%, the stacked mixture is sealed with waterproof cloth or plastic film to avoid water loss and ensure that the hydration reaction continues, the mixture is stacked in layers and turned over regularly during stacking to improve internal ventilation and water distribution uniformity and avoid local drying or uneven reaction.

[0022] Preferably, when the green body is processed into a building material in S7, the cooled green body is cut, polished, crushed, polished, and engraved in one or more ways to prepare a building material, and the building material includes ecological blocks, permeable pavement materials, light insulation boards, building decoration materials, or building aggregates.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] 1. The present application realizes efficient and environmentally friendly treatment of calcium fluoride sludge through the synergistic effect of multiple components, significantly reducing the threat to the ecological environment and human health. First, the chemical stabilizing agent effectively inhibits the solubility of calcium fluoride and the migration of heavy metal ions by forming stable complexes and encapsulation structures, reducing the fluoride leaching rate of the sludge to below the safety threshold. Second, the microwave dehydration aid combined with a spiral microwave heating device reduces the water content of the sludge from the initial state, significantly reducing the volume and avoiding the high energy consumption problem of traditional dehydration processes. Third, the inorganic curing agent generates calcium silicate hydrate through hydration, further fixing harmful substances, with a fluoride ion curing rate of 60-80%, significantly reducing the risk of secondary pollution. Fourth, the gradual cooling through air cooling equipment during sintering avoids structural cracks caused by high-temperature rapid cooling, ensuring the long-term stability of the cured body. This technology not only meets the requirements of hazardous waste landfill pollution control standards, but also reduces the need for landfill through resource utilization, avoiding the occupation of land resources and groundwater pollution caused by traditional landfill.

[0025] 2. Through full-process optimization design, the present invention achieves the reduction, stabilization and resource utilization of calcium fluoride sludge, with significant economic value and social benefits. First, the mixture after chemical stabilization and solidification treatment can be directly used to prepare ecological building blocks, permeable paving materials and other building materials. Its high compressive strength and durability can replace traditional clay bricks or cement products, reducing the building materials industry's dependence on natural resources. Second, through sintering technology and fine processing, high-value-added building decoration materials can be produced, expanding market application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a flow chart of the preparation method of the present invention. DETAILED DESCRIPTION

[0027] Example 1

[0028] An environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent, comprising the following raw materials in parts by weight:

[0029] 20-30 parts of chemical stabilizing agent, 60-70 parts of inorganic curing agent, 1-5 parts of microwave dehydration auxiliary agent, and 2-5 parts of pH regulator.

[0030] Furthermore, 1 part of chemical stabilization agent includes 0.6 parts of polyphosphate scale inhibitor, 0.2 parts of chelating agent and 0.2 parts of dispersant, and 1 part of inorganic curing agent includes 0.5 parts of cement, 0.3 parts of fly ash and 0.2 parts of shale particles.

[0031] Chemical stabilizers form stable complexes with calcium ions in calcium fluoride, reducing its solubility. Chelating agents combine with heavy metal ions to form soluble chelates, inhibiting their migration. Dispersants improve particle dispersion and enhance reaction uniformity. Inorganic solidifiers form calcium silicate hydrates through hydration, encapsulating and immobilizing harmful substances. The pozzolanic effect of fly ash further enhances the solidified structure. Shale particles optimize the pore structure and improve material durability. Microwave dewatering agents significantly enhance the sludge's ability to absorb microwave energy, accelerating water evaporation and providing suitable physical conditions for subsequent solidification. Through the dual effects of chemical stabilization and physical solidification, the leaching toxicity of calcium fluoride and heavy metals is effectively reduced, avoiding the risk of secondary pollution. Furthermore, the solidified product can be used as a building material, achieving resource utilization and reducing landfill pressure.

[0032] Example 2

[0033] See also Figure 1 A method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent comprises the following steps:

[0034] S1. Raw material preparation: 1 part of chemical stabilization agent includes 0.6 parts of polyphosphate scale inhibitor, 0.2 parts of chelating agent and 0.2 parts of dispersant; 1 part of inorganic curing agent includes 0.5 parts of cement, 0.3 parts of fly ash and 0.2 parts of shale particles;

[0035] S2. Pretreatment of calcium fluoride sludge: Pour the calcium fluoride sludge and microwave dehydration aid into a stirring dehydrator, wherein the microwave dehydration aid is magnesium sulfate. The stirring dehydrator first stirs and mixes the calcium fluoride sludge and the microwave dehydration aid, and then centrifuges and dehydrates the mixture after the mixing is completed.

[0036] S3. Microwave heating: The dehydrated calcium fluoride sludge is transported to a spiral microwave heating device. During the spiral transportation process, the calcium fluoride sludge is heated by microwaves to dry the water content of the calcium fluoride sludge to 30-40%. The magnesium sulfate dehydrating agent helps the calcium fluoride sludge absorb microwave energy and effectively converts this energy into heat energy, thereby accelerating the evaporation rate of the water in the calcium fluoride sludge.

[0037] S4. Chemical stabilization treatment: Pour the dried calcium fluoride sludge and chemical stabilization agent solution into the reaction tank and stir and mix for 10-40 minutes. The polyphosphate scale inhibitor forms a stable complex with the calcium ions in the calcium fluoride sludge, thereby reducing the solubility of calcium fluoride. The chelating agent combines with the heavy metal ions in the calcium fluoride sludge to form a soluble chelate. The dispersant disperses the particulate matter in the calcium fluoride sludge to improve the chemical treatment effect.

[0038] S5. Solidification treatment: The chemically treated calcium fluoride sludge and the inorganic solidifying agent are stirred and mixed. Water is added during the mixing process. The water and cement react to form calcium silicate hydrates to encapsulate and fix harmful substances in the sludge. The fly ash reacts with the calcium silicate hydrates to enhance the overall performance of the mixture. The shale particles optimize the pore structure within the mixture, ultimately forming a recyclable mixture.

[0039] S6, aging and sintering, the mixture is piled and aged for 12-36 hours to promote the formation of silicate minerals. After the aging is completed, the mixture is pressed into a green body, and the green body is sent to a sintering device and sintered into a blank at a high temperature of 1000-1200°C;

[0040] S7. Utilization of building materials: Cool the sintered blanks, use air cooling equipment to gradually cool the blanks during cooling, and then process the cooled blanks into building materials.

[0041] Furthermore, when preparing one portion of the chemical stabilizing agent in S1, the polyphosphate scale inhibitor, the chelating agent and the dispersant are weighed in proportion, and the weighed polyphosphate scale inhibitor, the chelating agent and the dispersant are stirred and mixed so that all the components are evenly mixed together.

[0042] Furthermore, when preparing one portion of the inorganic curing agent in S1, cement, fly ash and shale particles are weighed in proportion, and the weighed cement, fly ash and shale particles are stirred and mixed so that all the components are evenly mixed together.

[0043] Furthermore, the stirring dehydrator in S2 includes a feeding system, a stirring system, a dehydration system and a discharging system. The feeding system transports the calcium fluoride sludge and the microwave dehydration aid into the stirring system. The stirring system stirs and mixes the calcium fluoride sludge and the microwave dehydration aid through multiple stirring blade assemblies. After the mixing is completed, the mixture enters the dehydration system. The dehydration system dehydrates the mixture through a high-efficiency rotating centrifugal drum. The dehydrated mixture enters the discharging system. The discharging system transports the mixture to the spiral microwave heating equipment and transports the separated wastewater to the sewage treatment equipment.

[0044] Furthermore, the spiral microwave heating equipment in S3 includes a spiral conveying system, a microwave generator, a heating chamber and an exhaust gas treatment system. The spiral conveying system is composed of one or more spiral blades and is installed in the heating chamber. The heating chamber is a closed cylindrical structure. During the operation of the spiral conveying system, the mixture moves slowly inside the heating chamber. During the movement, the microwave generator emits microwave energy to the mixture. The microwave energy interacts with the water molecules in the mixture to heat the material. The generated water vapor enters the exhaust gas treatment system. The exhaust gas treatment system first condenses the water vapor and then purifies the exhaust gas and wastewater separately.

[0045] Furthermore, after chemical treatment in S4, the treated mixed slurry is introduced into a sedimentation tank to allow the solid particles to naturally settle to the bottom, and the supernatant on the top is extracted for further treatment. Then, a sludge pump is used to extract the precipitated solid particles for dehydration. The dehydration equipment is a plate and frame filter press. After dehydration, calcium fluoride sludge blocks are formed. The calcium fluoride sludge blocks are processed using a crushing device to break the calcium fluoride sludge blocks into calcium fluoride sludge particles.

[0046] Furthermore, after the mixture in S5 is prepared, the mixture is ground. During the grinding process, the mixture is conveyed to a ball mill, and the ball mill grinds the large particles in the mixture through the grinding balls inside it. After the grinding is completed, the mixture is conveyed to a vibrating screen, and the large particles in the mixture are screened to make the composition of the mixture uniform. The screened large particle mixture is returned to the ball mill for secondary grinding, and the mixture after the secondary grinding is screened again. Finally, the mixture after multiple screenings is stirred and mixed, and then subjected to subsequent processing.

[0047] Further, in S6, when aging, the aging temperature is 40-60 DEG C, the humidity is 70-90%, the stacked mixture is sealed with waterproof cloth or plastic film to avoid water loss, ensure that the hydration reaction continues, and during the stacking process, the mixture is layered and regularly turned over to improve internal ventilation and water distribution uniformity, avoiding local drying or uneven reaction.

[0048] Further, in S7, the blank is processed into building materials, and one or more of cutting, grinding, crushing, polishing and carving are performed on the cooled blank to prepare building materials, including ecological blocks, permeable paving materials, light insulation boards, building decoration materials or building aggregates.

[0049] Through the synergistic effect of multiple components, efficient and environmentally friendly treatment of calcium fluoride sludge is achieved, significantly reducing its threat to the ecological environment and human health. First, the chemical stabilizing agent effectively inhibits the solubility of calcium fluoride and the migration of heavy metal ions by forming stable complexes and encapsulation structures, reducing the fluoride leaching rate of the sludge to below the safety threshold. Second, the microwave dehydration aid combined with a spiral microwave heating device reduces the water content of the sludge from the initial state, significantly reducing the volume and avoiding the high energy consumption problem of traditional dehydration processes. Third, the inorganic solidifying agent generates calcium silicate hydrate through hydration, further fixing harmful substances, with a fluoride ion solidification rate of 60-80%, significantly reducing the risk of secondary pollution. In addition, the gradual cooling through air cooling equipment during the sintering process avoids structural cracks caused by high-temperature rapid cooling, ensuring the long-term stability of the solidified body. This technology not only meets the requirements of hazardous waste landfill pollution control standards, but also reduces landfill demand through resource utilization, avoiding the occupation of land resources and groundwater pollution caused by traditional landfill.

[0050] Through full-process optimization design, the calcium fluoride sludge is reduced, stabilized and resourcefully treated, with significant economic value and social benefits. First, the mixture after chemical stabilization and solidification can be directly used to prepare building materials such as ecological blocks and permeable paving materials, with high compressive strength and durability, replacing traditional clay bricks or cement products and reducing the dependence of the building materials industry on natural resources. Second, through sintering process and fine processing, high-value-added building decoration materials can be produced, expanding market application scenarios.

[0051] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent, characterized in that: The composition comprises the following raw materials in parts by weight: 20-30 parts of chemical stabilizing agent, 60-70 parts of inorganic curing agent, 1-5 parts of microwave dehydration auxiliary agent, and 2-5 parts of pH regulator.

2. A method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent, applicable to the environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent according to claim 1, characterized in that: The following steps are involved: S1. Raw material preparation: 1 part of chemical stabilization agent includes 0.6 parts of polyphosphate scale inhibitor, 0.2 parts of chelating agent and 0.2 parts of dispersant; 1 part of inorganic curing agent includes 0.5 parts of cement, 0.3 parts of fly ash and 0.2 parts of shale particles; S2. Pretreatment of calcium fluoride sludge: Pour the calcium fluoride sludge and microwave dehydration aid into a stirring dehydrator, wherein the microwave dehydration aid is magnesium sulfate. The stirring dehydrator first stirs and mixes the calcium fluoride sludge and the microwave dehydration aid, and then centrifuges and dehydrates the mixture after the mixing is completed. S3. Microwave heating: The dehydrated calcium fluoride sludge is transported to a spiral microwave heating device. During the spiral transportation process, the calcium fluoride sludge is heated by microwaves to dry the water content of the calcium fluoride sludge to 30-40%. The magnesium sulfate dehydrating agent helps the calcium fluoride sludge absorb microwave energy and effectively converts this energy into heat energy, thereby accelerating the evaporation rate of the water in the calcium fluoride sludge. S4. Chemical stabilization treatment: Pour the dried calcium fluoride sludge and chemical stabilization agent solution into the reaction tank and stir and mix for 10-40 minutes. The polyphosphate scale inhibitor forms a stable complex with the calcium ions in the calcium fluoride sludge, thereby reducing the solubility of calcium fluoride. The chelating agent combines with the heavy metal ions in the calcium fluoride sludge to form a soluble chelate. The dispersant disperses the particulate matter in the calcium fluoride sludge to improve the chemical treatment effect. S5. Solidification treatment: The chemically treated calcium fluoride sludge and the inorganic solidifying agent are stirred and mixed. Water is added during the mixing process. The water and cement react to form calcium silicate hydrates to encapsulate and fix harmful substances in the sludge. The fly ash reacts with the calcium silicate hydrates to enhance the overall performance of the mixture. The shale particles optimize the pore structure within the mixture, ultimately forming a recyclable mixture. S6, aging and sintering, the mixture is piled and aged for 12-36 hours to promote the formation of silicate minerals. After the aging is completed, the mixture is pressed into a green body, and the green body is sent to a sintering device and sintered into a blank at a high temperature of 1000-1200°C; S7. Utilization of building materials: Cool the sintered blanks, use air cooling equipment to gradually cool the blanks during cooling, and then process the cooled blanks into building materials.

3. The method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent according to claim 1, characterized in that: When preparing one portion of the chemical stabilizing agent in S1, the polyphosphate scale inhibitor, the chelating agent and the dispersant are weighed in proportion, and the weighed polyphosphate scale inhibitor, the chelating agent and the dispersant are stirred and mixed so that all the components are evenly mixed together.

4. The method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent according to claim 1, characterized in that: When preparing one portion of the inorganic curing agent in S1, cement, fly ash, and shale particles are weighed in proportion, and the weighed cement, fly ash, and shale particles are stirred and mixed so that all the components are evenly mixed together.

5. The method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent according to claim 1, characterized in that: The stirring dehydrator in S2 includes a feeding system, a stirring system, a dehydration system and a discharging system. The feeding system transports the calcium fluoride sludge and the microwave dehydration aid to the stirring system. The stirring system stirs and mixes the calcium fluoride sludge and the microwave dehydration aid through multiple stirring blade assemblies. After mixing, the mixture enters the dehydration system. The dehydration system dehydrates the mixture through a high-efficiency rotating centrifugal drum. The dehydrated mixture enters the discharging system. The discharging system transports the mixture to the spiral microwave heating equipment and transports the separated wastewater to the sewage treatment equipment.

6. The method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent according to claim 1, characterized in that: The spiral microwave heating equipment in S3 includes a spiral conveying system, a microwave generator, a heating chamber and an exhaust gas treatment system. The spiral conveying system is composed of one or more spiral blades and is installed in the heating chamber. The heating chamber is a closed cylindrical structure. During the operation of the spiral conveying system, the mixture moves slowly inside the heating chamber. During the movement, the microwave generator emits microwave energy to the mixture. The microwave energy interacts with the water molecules in the mixture to heat the material. The generated water vapor enters the exhaust gas treatment system. The exhaust gas treatment system first condenses the water vapor and then purifies the exhaust gas and wastewater separately.

7. The method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent according to claim 1, characterized in that: After chemical treatment in S4, the treated mixed slurry is introduced into a sedimentation tank to allow the solid particles to naturally settle to the bottom. The supernatant on the top is extracted for further treatment, and then a sludge pump is used to extract the precipitated solid particles for dehydration. The dehydration equipment is a plate and frame filter press. After dehydration, calcium fluoride sludge blocks are formed. The calcium fluoride sludge blocks are processed using a crushing equipment to break the calcium fluoride sludge blocks into calcium fluoride sludge particles.

8. The method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent according to claim 1, characterized in that: After the mixture in S5 is prepared, the mixture is ground. During the grinding process, the mixture is conveyed to a ball mill, and the ball mill grinds large particles in the mixture through the grinding balls inside it. After the grinding is completed, the mixture is conveyed to a vibrating screen, and the large particles in the mixture are screened to make the mixture composition uniform. The screened large particle mixture is returned to the ball mill for secondary grinding, and the secondary ground mixture is screened again. Finally, the mixture after multiple screenings is stirred and mixed, and then subjected to subsequent processing.

9. The method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent according to claim 1, characterized in that: During aging in S6, the aging temperature is 40-60°C and the humidity is 70-90%. The stacked mixture is sealed with a waterproof cloth or plastic film to avoid moisture loss and ensure that the hydration reaction continues. During the stacking process, the mixture is stacked in layers and turned over regularly to improve internal ventilation and uniformity of moisture distribution to avoid local drying or uneven reaction.

10. The method for preparing an environmentally friendly and efficient calcium fluoride sludge solidification and stabilization agent according to claim 1, characterized in that: When the blank is processed into building materials in S7, the cooled blank is subjected to one or more of cutting, grinding, crushing, polishing and carving to prepare the building materials, which include ecological blocks, permeable paving materials, lightweight insulation boards, building decoration materials or building aggregates.

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