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

Abstract

The application discloses an environment-friendly and efficient solidification and stabilization agent for calcium fluoride sludge and a preparation method thereof, and comprises the following raw materials in parts by weight: a chemical stabilization agent 20-30 parts, an inorganic solidification agent 60-70 parts, a microwave dehydration aid 1-5 parts and a pH regulator 2-5 parts. The application has the advantages of good treatment effect, solves the problems that the existing calcium fluoride sludge treatment agent has poor treatment effect on calcium fluoride sludge in the preparation process, harmful substances and pollutants in the calcium fluoride sludge are easy to penetrate into underground water or soil, environmental pollution is caused, and the treated sludge cannot reach the environmental protection standard and is disposed or utilized, which leads to the problems of re-releasing harmful substances in the use process and forming secondary pollution.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of material recycling, in particular to an environment-friendly and efficient solidification and stabilization agent for calcium fluoride sludge and a preparation method thereof. BACKGROUND

[0002] The environment-friendly and efficient solidification and stabilization agent for calcium fluoride sludge refers to a special agent for solidifying or stabilizing harmful components in calcium fluoride sludge through chemical or physical methods. The agent can effectively reduce the dissolution risk of fluorides and other harmful substances in the sludge, improve the stability of the sludge, and realize resource utilization. The environment-friendly and efficient solidification and stabilization agent for calcium fluoride sludge includes inorganic solidification agents and chemical stabilization agents. The chemical stabilization agents react with pollutants in the calcium fluoride sludge to generate stable precipitates, and the solidification agents fix the harmful components in the sludge in stable mineral structures through physical wrapping or chemical reaction.

[0003] The existing calcium fluoride sludge treatment agent has poor treatment effect on calcium fluoride sludge in the preparation process. The harmful substances and pollutants in the calcium fluoride sludge can easily penetrate into groundwater or soil, causing environmental pollution. Moreover, the treated sludge cannot meet the environmental protection standard and is disposed or utilized, which can cause the harmful substances to be released again in the use process, forming secondary pollution. SUMMARY

[0004] The application aims to provide an environment-friendly and efficient solidification and stabilization agent for calcium fluoride sludge and a preparation method thereof, which has the advantages of good treatment effect, and solves the problems of the existing calcium fluoride sludge treatment agent, such as poor treatment effect on calcium fluoride sludge in the preparation process, easy penetration of harmful substances and pollutants in the calcium fluoride sludge into groundwater or soil, causing environmental pollution, and the treated sludge cannot meet the environmental protection standard and is disposed or utilized, which can cause the harmful substances to be released again in the use process, forming secondary pollution.

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme: an environment-friendly and efficient solidification and stabilization agent for calcium fluoride sludge, which comprises the following raw materials in parts by weight:

[0006] The chemical stabilization agent is 20-30 parts, the inorganic solidification agent is 60-70 parts, the microwave dehydration aid is 1-5 parts, and the pH regulator is 2-5 parts.

[0007] A preparation method of the environment-friendly and efficient solidification and stabilization agent for calcium fluoride sludge, comprising the following steps:

[0008] S1, raw material preparation, 1 part of the chemical stabilization agent includes 0.6 parts of a polyphosphate scale inhibitor, 0.2 parts of a chelating agent and 0.2 parts of a dispersant, 1 part of the inorganic solidification agent includes 0.5 parts of cement, 0.3 parts of coal ash and 0.2 parts of shale particles;

[0009] S2, calcium fluoride sludge pretreatment, calcium fluoride sludge and microwave dewatering aid are poured into the stirring dewatering machine, the microwave dewatering aid is magnesium sulfate, the stirring dewatering machine is used to stir and mix the calcium fluoride sludge and the microwave dewatering aid, and then centrifugal dewatering is carried out;

[0010] S3, microwave heating, the dewatered calcium fluoride sludge is transported into the spiral microwave heating equipment, and microwave heating is carried out on the calcium fluoride sludge in the process of spiral conveying, the moisture content of the calcium fluoride sludge is dried to 30-40%, the magnesium sulfate dewatering agent helps the calcium fluoride sludge to absorb microwave energy, and effectively converts the energy into heat energy, so as to accelerate the evaporation speed of the internal water in the calcium fluoride sludge;

[0011] S4, chemical stabilization treatment, the dried calcium fluoride sludge and the chemical stabilization agent solution are poured into the reaction tank and stirred and mixed, the mixing time is 10-40 min, the polyphosphate scale inhibitor forms a stable complex with calcium ions in the calcium fluoride sludge, so as to reduce the solubility of calcium fluoride, the chelating agent combines with heavy metal ions in the calcium fluoride sludge to form a soluble chelate, and the dispersant disperses the particulate matter in the calcium fluoride sludge, so as to improve the chemical treatment effect;

[0012] S5, solidification treatment, the chemical treated calcium fluoride sludge and the inorganic solidifying agent are stirred and mixed, and water is added in the mixing process, the water and the cement undergo hydration reaction to generate calcium silicate hydrate to wrap and fix the harmful substances in the sludge, the fly ash reacts with the calcium silicate hydrate to enhance the overall performance of the mixture, and the shale particles optimize the pore structure inside the mixture, so as to finally generate a recyclable mixture;

[0013] S6, aging and sintering, the mixture is stacked and aged for 12-36 hours to promote the generation of silicate minerals, and then the mixture is pressed into a green body, and the green body is sent into a sintering equipment to be sintered into a blank at a high temperature of 1000-1200 DEG C;

[0014] S7, building material utilization, the sintered blank is cooled, the air cooling equipment is used to gradually cool the blank during the cooling, and then the cooled blank is processed into a building material.

[0015] As a preparation method of the calcium fluoride sludge environmental protection efficient solidification and stabilization agent, in the preparation of 1 part of the chemical stabilization agent, the polyphosphate scale inhibitor, the chelating agent and the dispersant are weighed according to the proportion, and the weighed polyphosphate scale inhibitor, chelating agent and dispersant are stirred and mixed to uniformly mix all the ingredients together.

[0016] Preferably, in the preparation method of the calcium fluoride sludge environment-friendly and efficient solidification and stabilization agent, in S1, when preparing 1 part of inorganic solidification agent, the cement, coal ash and shale particles are weighed in proportion, and the weighed cement, coal ash and shale particles are stirred and mixed to uniformly mix all the ingredients together.

[0017] Preferably, in the preparation method of the calcium fluoride sludge environment-friendly and efficient solidification and stabilization agent, the stirring and dewatering machine in S2 comprises a feeding system, a stirring system, a dewatering system and a discharging system. The feeding system delivers the calcium fluoride sludge and the microwave dewatering aid into the stirring system. The stirring system stirs and mixes the calcium fluoride sludge and the microwave dewatering aid through a plurality of stirring blade assemblies. After mixing, the mixture enters the dewatering system. The dewatering system dewatering the mixture through a high-efficiency rotating centrifugal drum. The dewatered mixture enters the discharging system. The discharging system delivers the mixture into the spiral microwave heating equipment and delivers the separated wastewater into the wastewater treatment equipment.

[0018] Preferably, in the preparation method of the calcium fluoride sludge environment-friendly and efficient solidification and stabilization agent, the spiral microwave heating equipment in S3 comprises a spiral conveying system, a microwave generator, a heating chamber and a waste 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 slowly moves inside the heating chamber. In the moving process, 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 waste gas treatment system. The waste gas treatment system first condenses the water vapor and then separately purifies the waste gas and wastewater.

[0019] Preferably, in the preparation method of the calcium fluoride sludge environment-friendly and efficient solidification and stabilization agent, after the chemical treatment in S4, the treated mixed slurry is introduced into a settling tank to allow the solid particles to naturally settle at the bottom. The supernatant at the top is pumped out for further treatment. Then, a sludge pump is used to pump out the settled solid particles for dewatering. The dewatering equipment is a plate and frame filter press. After dewatering, calcium fluoride sludge blocks are formed. A crushing device is used to process the calcium fluoride sludge blocks to crush them 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 layered and regularly turned over 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、The present application realizes the reduction, stabilization and resource utilization of calcium fluoride sludge through whole-process optimization design, has significant economic value and social benefits, firstly, the mixture after chemical stabilization and solidification treatment can be directly used for preparing ecological building blocks, permeable paving materials and other building materials, which has high compressive strength and durability, replaces traditional clay bricks or cement products, reduces the dependence of the building materials industry on natural resources, secondly, through sintering process and fine processing, high value-added building decoration materials can be produced, which expands the market application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The preparation method flow chart of the present application. DETAILED DESCRIPTION

[0027] Example 1

[0028] A kind of calcium fluoride sludge environmental protection high-efficiency solidification and stabilization reagent, comprising the following weight parts of raw materials:

[0029] Chemical stabilization reagent 20-30 parts, inorganic curing agent 60-70 parts, microwave dehydration aid 1-5 parts, pH regulator 2-5 parts.

[0030] Further, 1 part of chemical stabilization reagent 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 coal ash and 0.2 parts of shale particles.

[0031] The chemical stabilization reagent forms a stable complex with calcium ions in calcium fluoride, reduces the solubility of calcium fluoride, the chelating agent combines with heavy metal ions to form a soluble chelate, inhibits its migration, and the dispersant improves the dispersibility of particulate matter and improves the uniformity of the reaction, the inorganic curing agent generates calcium silicate hydrate by hydration reaction, which wraps and fixes harmful substances, at the same time, the pozzolanic effect of fly ash further enhances the strength of the solidified body, and the shale particles optimize the pore structure and improve the durability of the material, the microwave dehydration aid can significantly enhance the absorption capacity of sludge to microwave energy, accelerate water evaporation, and at the same time provide suitable physical conditions for subsequent solidification, through the dual action of chemical stabilization and physical solidification, the leaching toxicity of calcium fluoride and heavy metals is effectively reduced, and the risk of secondary pollution is avoided, at the same time, the solidified product can be used as a building material raw material, realizing resource utilization and reducing landfill pressure.

[0032] Example 2

[0033] Please refer to Figure 1 A preparation method of a calcium fluoride sludge environmental protection high-efficiency solidification and stabilization reagent, comprising the following steps:

[0034] S1, raw material preparation, 1 part of the 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, calcium fluoride sludge pretreatment, pour calcium fluoride sludge and microwave dewatering aid into the stirring dewatering machine, the microwave dewatering aid is magnesium sulfate, the stirring dewatering machine first stirs and mixes the calcium fluoride sludge and the microwave dewatering aid, and then centrifugal dewatering is performed after mixing is completed;

[0036] S3, microwave heating, the dewatered calcium fluoride sludge is transported to the spiral microwave heating equipment, and microwave heating is performed on the calcium fluoride sludge in the process of spiral conveying, the moisture content of the calcium fluoride sludge is dried to 30-40%, the magnesium sulfate dewatering agent helps the calcium fluoride sludge to absorb microwave energy, and effectively converts the energy into heat energy, accelerating the evaporation speed of the internal water in the calcium fluoride sludge;

[0037] S4, chemical stabilization treatment, pour the dried calcium fluoride sludge and the chemical stabilization agent solution into the reaction tank for stirring and mixing, the mixing time is 10-40 min, the polyphosphate scale inhibitor forms a stable complex with calcium ions in the calcium fluoride sludge, thereby reducing the solubility of calcium fluoride, the chelating agent combines with heavy metal ions in the calcium fluoride sludge to form a soluble chelate, and the dispersant disperses the particulate matter in the calcium fluoride sludge, thereby improving the chemical treatment effect;

[0038] S5, curing treatment, stir and mix the chemically treated calcium fluoride sludge and the inorganic curing agent, and add water during the mixing process, the water and the cement undergo hydration reaction to generate calcium silicate hydrate to wrap and fix the harmful substances in the sludge, the fly ash reacts with the calcium silicate hydrate to enhance the overall performance of the mixture, and the shale particles optimize the pore structure inside the mixture, finally generating a recyclable mixture;

[0039] S6, aging and sintering, stack and age the mixture for 12-36 hours to promote the generation of silicate minerals, and then press the mixture into a green body after aging is completed, and then send the green body into a sintering equipment to be sintered into a blank at a high temperature of 1000-1200℃;

[0040] S7, building material utilization, cool the sintered blank, use air cooling equipment to gradually cool the blank during cooling, and then process the cooled blank into a building material.

[0041] Further, in S1, the polyphosphate scale inhibitor, the chelating agent and the dispersant are weighed in proportion when preparing 1 part of the chemical stabilization agent, and the weighed polyphosphate scale inhibitor, chelating agent and dispersant are stirred and mixed to uniformly mix all the ingredients together.

[0042] Further, in S1, when preparing 1 part of inorganic curing agent, the cement, fly ash and shale particles are weighed in proportion, and the weighed cement, fly ash and shale particles are stirred and mixed to uniformly mix all ingredients.

[0043] Further, the stirring and dewatering machine in S2 includes a feeding system, a stirring system, a dewatering system and a discharging system. The feeding system delivers the calcium fluoride sludge and the microwave dewatering aid into the stirring system. The stirring system stirs and mixes the calcium fluoride sludge and the microwave dewatering aid through a plurality of stirring blade assemblies. After mixing, the mixture enters the dewatering system. The dewatering system dewatering the mixture through a high-efficiency rotating centrifugal drum. The dewatered mixture enters the discharging system. The discharging system delivers the mixture into the spiral microwave heating equipment and delivers the separated wastewater into the sewage treatment equipment.

[0044] Further, the spiral microwave heating equipment in S3 includes a spiral conveying system, a microwave generator, a heating chamber and a waste 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 slowly moves inside the heating chamber. The microwave generator emits microwave energy to the mixture during the movement process. The microwave energy interacts with the water molecules in the mixture to heat the material. The generated water vapor enters the waste gas treatment system. The waste gas treatment system first condenses the water vapor and then separately purifies the waste gas and wastewater.

[0045] Further, after the chemical treatment in S4, the treated mixed slurry is introduced into a settling tank to allow the solid particles to naturally settle at the bottom. The supernatant at the top is pumped out for further treatment. Then, a sludge pump is used to pump out the settled solid particles for dewatering. The dewatering equipment is a plate and frame filter press. After dewatering, calcium fluoride sludge blocks are formed. A crushing device is used to process the calcium fluoride sludge blocks into calcium fluoride sludge particles.

[0046] Further, after the preparation of the mixture in S5, the mixture is ground. During the grinding process, the mixture is delivered into a ball mill. The ball mill grinds large particles in the mixture with grinding balls inside. After grinding, the mixture is delivered into a vibrating screen for screening. The large particle mixture is screened to make the mixture uniform. The screened large particle mixture is returned to the ball mill for secondary grinding. The secondary ground mixture is screened again. Finally, the multiple screened mixture is stirred and mixed for 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. A method for preparing an environmentally friendly and highly efficient solidification and stabilization agent for calcium fluoride sludge, characterized in that, The ingredients include the following parts by weight: 20-30 parts chemical stabilizer, 60-70 parts inorganic curing agent, 1-5 parts microwave dehydration aid, and 2-5 parts pH adjuster; Includes the following steps: S1. Raw material preparation: 1 part of chemical stabilizing 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 dewatering aid into a stirring dewatering machine. The microwave dewatering aid is magnesium sulfate. The stirring dewatering machine first stirs and mixes the calcium fluoride sludge and microwave dewatering aid. After mixing, centrifuge the mixture to dewater it. S3. Microwave heating: The dehydrated calcium fluoride sludge is transported to a spiral microwave heating device. During the spiral conveying process, the calcium fluoride sludge is microwave heated to dry the moisture content of the calcium fluoride sludge to 30-40%. Magnesium sulfate dehydrating agent helps the calcium fluoride sludge absorb microwave energy and effectively convert this energy into heat energy, accelerating the evaporation rate of the moisture inside the calcium fluoride sludge. S4. Chemical stabilization treatment: Pour the dried calcium fluoride sludge and chemical stabilizing agent solution into the reaction tank and stir to 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 soluble chelates. The dispersant disperses the particulate matter in the calcium fluoride sludge, improving the chemical treatment effect. S5. Solidification treatment: The chemically treated calcium fluoride sludge is mixed with an inorganic solidifying agent, and water is added during the mixing process. The water and cement undergo a hydration reaction to generate calcium silicate hydrate, which encapsulates and fixes the harmful substances in the sludge. Fly ash reacts with calcium silicate hydrate to enhance the overall performance of the mixture. Shale particles optimize the internal pore structure of the mixture, ultimately generating a recyclable mixture. S6. Aging and sintering: The mixture is piled up and aged for 12-36 hours to promote the formation of silicate minerals. After aging, the mixture is pressed into a green body and sent into a sintering equipment to be sintered into a green body at a high temperature of 1000-1200℃. S7. Building material utilization: The sintered billet is cooled down. During the cooling process, air-cooling equipment is used to gradually cool the billet down. Then, the cooled billet is processed into building materials.

2. The preparation method of the environmentally friendly and efficient solidification and stabilization agent for calcium fluoride sludge according to claim 1, characterized in that: In S1, when preparing one part of chemical stabilizing agent, the polyphosphate scale inhibitor, chelating agent and dispersant are weighed according to the proportion, and the weighed polyphosphate scale inhibitor, chelating agent and dispersant are stirred and mixed to make all components uniformly mixed together.

3. The preparation method of the environmentally friendly and efficient solidification and stabilization agent for calcium fluoride sludge according to claim 1, characterized in that: In S1, when preparing one part of inorganic curing agent, cement, fly ash and shale particles are weighed according to the proportion, and the weighed cement, fly ash and shale particles are stirred and mixed to make all components uniformly mixed together.

4. The preparation method of the environmentally friendly and efficient solidification and stabilization agent for calcium fluoride sludge according to claim 1, characterized in that: The S2 mixing dewatering machine includes a feeding system, a mixing system, a dewatering system, and a discharging system. The feeding system conveys calcium fluoride sludge and microwave dewatering aid to the mixing system. The mixing system mixes the calcium fluoride sludge and microwave dewatering aid through multiple mixing blade assemblies. After mixing, the mixture enters the dewatering system, which dewaters the mixture through a high-efficiency rotating centrifugal drum. The dewatered mixture enters the discharging system, which conveys the mixture to a spiral microwave heating device and delivers the separated wastewater to a wastewater treatment device.

5. The preparation method of the environmentally friendly and efficient solidification and stabilization agent for calcium fluoride sludge 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 consists of one or more spiral blades and is installed inside the heating chamber, which 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, which first condenses the water vapor and then purifies the exhaust gas and wastewater separately.

6. The preparation method of the environmentally friendly and efficient solidification and stabilization agent for calcium fluoride sludge according to claim 1, characterized in that: After chemical treatment in S4, the treated mixed slurry is introduced into a settling tank, allowing the solid particles to settle naturally to the bottom. The supernatant at the top is extracted for further treatment. Then, a sludge pump is used to extract the settled solid particles for dewatering. The dewatering equipment is a plate and frame filter press. After dewatering, calcium fluoride sludge blocks are formed. The calcium fluoride sludge blocks are then processed using crushing equipment to break them into calcium fluoride sludge particles.

7. The preparation method of the environmentally friendly and efficient solidification and stabilization agent for calcium fluoride sludge according to claim 1, characterized in that: After the mixture in S5 is prepared, it is ground. During the grinding process, the mixture is fed into a ball mill, where the grinding balls inside grind the large particles in the mixture. After grinding, the mixture is fed into a vibrating screen to screen the large particles, making the mixture composition uniform. The screened large particles are then returned to the ball mill for secondary grinding. The mixture after secondary grinding is screened again. Finally, the mixture after multiple screenings is stirred and mixed for subsequent processing.

8. The preparation method of the environmentally friendly and efficient solidification and stabilization agent for calcium fluoride sludge according to claim 1, characterized in that: During aging in S6, the aging temperature is 40-60℃ and the humidity is 70-90%. The piled mixture is sealed with 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 uniform moisture distribution, and to avoid local dryness or uneven reaction.

9. The preparation method of the environmentally friendly and efficient solidification and stabilization agent for calcium fluoride sludge according to claim 1, characterized in that: In S7, when processing billets into building materials, the cooled billets are subjected to one or more of the following processes: cutting, grinding, crushing, polishing, and carving, to prepare building materials. Building materials include ecological blocks, permeable paving materials, lightweight insulation boards, building decoration materials, or building aggregates.

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