A system for preparing high-purity ammonium fluoride in the photovoltaic industry through combined fluorine and ammonia treatment

Abstract

The utility model relates to photovoltaic technical field, specifically is a kind of photovoltaic industry fluorine ammonia combined processing preparation high-purity ammonium fluoride's system, including concentrated fluorine waste water delivery pipe, ammonia-containing waste gas delivery pipe, waste gas absorption tower, collection tank, impurity removal system, blending tank, concentration equipment, crystallization equipment, solid-liquid separation equipment, drying equipment and packaging equipment;It can utilize fluorine ammonia combined processing mode, and fluorine-containing waste water is through waste gas absorption, pH adjustment, solid-liquid separation, evaporation concentration, crystallization and drying etc. Series of processes, not only can realize the preparation of ammonium fluoride product, so that the fluorine-containing waste water of photovoltaic enterprise ammonia-containing waste gas is recycled to resource, to reduce the environmental protection cost of enterprise, also can obtain silicon dioxide while fluorine ammonia combined processing preparation ammonium fluoride product, by recycling silicon dioxide, can further reduce resource waste, reduce the environmental protection cost required for wastewater treatment.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, specifically to a system for preparing high-purity ammonium fluoride through a combined process of fluorine and ammonia in the photovoltaic industry. Background Technology

[0002] Photovoltaics (solar photovoltaic power generation system) is a power generation system that converts the radiant energy of sunlight into electrical energy. The photovoltaic power generation industry uses a large amount of hydrofluoric acid. In industrial wastewater, the fluoride content is as high as 10,000 mg / L, causing serious environmental pollution and having a great impact on human health. Fluoride ions are highly reactive, and fluoride-containing wastewater is a difficult type of industrial wastewater to remove. According to national wastewater standards, it fails to meet its discharge standards and cannot be directly discharged.

[0003] Currently, the treatment of fluoride-containing wastewater requires the input of large amounts of reagents (such as lime, PAC, PAM, etc.) followed by flocculation and sedimentation. This process incurs significant reagent costs, resulting in high wastewater treatment costs and hindering the economic, environmental, and sustainable development of the photovoltaic industry. Therefore, this paper proposes a system for the combined treatment of fluoride and ammonia in the photovoltaic industry to produce high-purity ammonium fluoride. This system enables the combined treatment of high-concentration fluoride-containing wastewater and ammonia-containing waste gas to produce ammonium fluoride products, allowing for the resource recovery of fluoride-containing wastewater and ammonia-containing waste gas from photovoltaic enterprises, thereby reducing the environmental protection costs of these companies. Summary of the Invention

[0004] To address the problems in existing technologies, this utility model provides a system for the combined treatment of fluoride and ammonia in the photovoltaic industry to prepare high-purity ammonium fluoride. This system facilitates the combined treatment of high-concentration fluoride-containing wastewater and ammonia-containing waste gas to produce ammonium fluoride products, enabling the resource recovery of fluoride-containing wastewater and ammonia-containing waste gas from photovoltaic enterprises, thereby reducing the environmental protection costs of these enterprises.

[0005] The technical solution adopted by this utility model to solve its technical problem is a system for the combined treatment of fluorine and ammonia in the photovoltaic industry to prepare high-purity ammonium fluoride, including a concentrated fluorine wastewater conveying pipe, an ammonia-containing waste gas conveying pipe, a waste gas absorption tower, a collection tank, a purification system, a blending tank (mixing tank), a concentration device, a crystallization device, a solid-liquid separation device, a drying device, and a packaging device. The outlet of the concentrated fluoride wastewater conveying pipe is connected to the inlet of the waste gas absorption tower, the outlet of the ammonia-containing waste gas conveying pipe is connected to the inlet of the waste gas absorption tower, the outlet of the waste gas absorption tower is connected to the collection tank through a pipe, and the outlet of the waste gas absorption tower discharges the remaining gas in compliance with standards.

[0006] By adopting the above technical solution, the fluoride-ammonia combined treatment method can be used to prepare ammonium fluoride products by going through a series of processes such as waste gas absorption, pH adjustment, solid-liquid separation, evaporation and concentration, crystallization and drying of fluoride-containing wastewater. This enables photovoltaic enterprises to recover fluoride-containing wastewater and ammonia-containing waste gas by resource utilization, thereby reducing the environmental protection costs of enterprises.

[0007] Specifically, the liquid outlet of the collection tank is connected to the impurity removal system through a pipeline. After filtration and impurity removal, the liquid phase of the impurity removal system is connected to the mixing tank through the liquid outlet pipeline, and the solid phase of the impurity removal system is collected uniformly through the solid waste end.

[0008] By adopting the above technical solution, the waste liquid obtained after the absorption of waste gas can be collected, precipitated, filtered and impurities removed in sequence to obtain filtrate and filter residue. At the same time, the filter residue can be recycled to form silica, which helps to further reduce the environmental protection costs of enterprises.

[0009] Specifically, the filtrate discharge end of the impurity removal system is connected to a mixing tank via a pipe, and the discharge end of the mixing tank is connected to the feed end of the concentration equipment via a pipe. The concentration equipment includes a condensate guide pipe, and the discharge end of the condensate guide pipe is connected to the inlet end of the waste gas absorption tower.

[0010] By adopting the above technical solution, the filtrate after the impurity removal system is mixed and evaporated.

[0011] Specifically, the discharge end of the concentration equipment is connected to the feed end of the crystallization equipment via a pipeline, the discharge end of the crystallization equipment is connected to a solid-liquid separation device via a pipeline, the liquid outlet of the solid-liquid separation device is connected to a mixing tank via a pipeline, and the discharge end of the solid-liquid separation device is connected to a drying device via a pipeline.

[0012] By adopting the above technical solution, the material obtained after evaporation can be crystallized, centrifuged, and dried in sequence to obtain ammonium fluoride product.

[0013] Specifically, the liquid outlet of the drying equipment is connected to a condenser, the condenser includes a condensate delivery pipe, and the liquid outlet of the condensate delivery pipe is connected to a mixing tank. The gas outlet of the condenser is connected to a waste gas absorption tower through a pipeline, and the material outlet of the drying equipment is connected to packaging equipment.

[0014] By adopting the above technical solution, the crystallized material can be dried, and the resulting ammonium fluoride product can be automatically packaged by packaging equipment. At the same time, after condensation and secondary waste gas absorption treatment, the non-condensable gases can be discharged after meeting the standards.

[0015] The beneficial effects of this utility model are: This invention describes a system for preparing high-purity ammonium fluoride through a combined fluoride-ammonia treatment in the photovoltaic industry. The system comprises a concentrated fluoride wastewater conveying pipe, an ammonia-containing waste gas conveying pipe, a waste gas absorption tower, a collection tank, a purification system, a mixing tank, a concentration device, a crystallization device, a solid-liquid separation device, a drying device, and a packaging device. Utilizing a combined fluoride-ammonia treatment method, the system processes fluoride-containing wastewater through a series of steps including waste gas absorption, pH adjustment, solid-liquid separation, evaporation and concentration, crystallization, and drying. This not only enables the preparation of ammonium fluoride, allowing for the resource recovery of fluoride-containing wastewater and ammonia-containing waste gas from photovoltaic enterprises, thereby reducing environmental costs, but also yields silicon dioxide during the ammonium fluoride production process. By recovering silicon dioxide, resource waste can be further reduced, lowering the environmental costs associated with wastewater treatment. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a flowchart illustrating the present invention. In the diagram: 1. Ammonia-containing waste gas conveying pipe; 2. Concentrated fluoride wastewater conveying pipe; 3. Waste gas absorption tower; 4. Collection tank; 5. Impurity removal system; 6. Mixing tank; 7. Concentration device; 8. Crystallization equipment; 9. Solid-liquid separation equipment; 10. Drying equipment; 11. Packaging equipment. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] A system for preparing high-purity ammonium fluoride through combined fluorine and ammonia treatment in the photovoltaic industry includes a waste pretreatment unit, a concentration unit, and a crystallization unit connected in sequence. The waste pretreatment unit includes a waste gas absorption tower, a collection tank and a purification system connected in sequence. The concentration unit is connected to the discharge end of the purification system, the inlet end of the crystallization unit is connected to the discharge end of the concentration unit, and the discharge end of the crystallization unit is also connected to a solid-liquid separation device. The solid-liquid separation device is connected to a drying device at the discharge end and to a recycling and processing unit at the liquid discharge end.

[0020] The solid phase of the impurity removal system is discharged and collected through the solid waste port. The recycling and processing unit includes a condenser connected to the liquid outlet of the drying equipment, and the condenser includes a condensate delivery pipe.

[0021] To facilitate the combined treatment of high-concentration fluoride-containing wastewater and ammonia-containing waste gas to produce ammonium fluoride products, enabling the resource recovery of fluoride-containing wastewater and ammonia-containing waste gas from photovoltaic enterprises, thereby reducing the environmental protection costs of these enterprises, such as... Figure 1As shown, the system for preparing high-purity ammonium fluoride through combined treatment of fluorine and ammonia in the photovoltaic industry according to this utility model includes an ammonia-containing waste gas conveying pipe 1; a concentrated fluorine wastewater conveying pipe 2; a waste gas absorption tower 3; a collection tank 4; a purification system 5; a blending tank 6; a concentration device 7; a crystallization device 8; a solid-liquid separation device 9; a drying device 10; and a packaging device 11.

[0022] The outlet of the concentrated fluoride wastewater conveying pipe 2 is connected to the inlet of the waste gas absorption tower 3, the outlet of the ammonia-containing waste gas conveying pipe 1 is connected to the inlet of the waste gas absorption tower 3, and the outlet of the waste gas absorption tower 3 is connected to the collection tank 4 through a pipe.

[0023] In use, the system utilizes a combination of fluoride and ammonia treatment. Through a series of processes including waste gas absorption tower 3, concentrated fluoride wastewater conveying pipe 2, ammonia-containing waste gas conveying pipe 1, collection tank 4, impurity removal system 5, blending tank 6, concentration device 7, crystallization equipment 8, solid-liquid separation equipment 9, and drying equipment 10, fluoride-containing wastewater undergoes waste gas absorption, pH adjustment, solid-liquid separation, evaporation concentration, crystallization, and drying to produce ammonium fluoride products. This allows photovoltaic enterprises to recover fluoride-containing wastewater and ammonia-containing waste gas through resource utilization, thereby reducing the environmental protection costs of enterprises.

[0024] For example, such as Figure 1 As shown, the present invention also includes a collection tank 4 whose outlet is connected to a purification system 4 via a pipe. The purification system 4 includes a membrane concentration and filtration device and a centrifugal separation device. The waste liquid outlet of the membrane concentration and filtration device is connected to the centrifugal separation device via a pipe, and the lower liquid outlet of the collection tank is connected to the centrifugal separation device via a pipe.

[0025] During use, the waste liquid obtained after absorbing the waste gas can be subjected to sedimentation, membrane concentration filtration, and centrifugal separation through the collection tank 4 and the impurity removal system to obtain filtrate and filter residue. At the same time, the filter residue can be recycled to form silica, which helps to further reduce the environmental protection costs of enterprises.

[0026] For example, such as Figure 1 As shown, the present invention also includes a filtrate discharge end of the impurity removal system connected to a mixing tank 6 via a pipe, and the discharge end of the mixing tank 6 connected to the feed end of the concentration device 7 via a pipe. The concentration device 7 includes a condensate guide pipe, and the discharge end of the condensate guide pipe is connected to the inlet end of the waste gas absorption tower 3.

[0027] During use, the filtrate after membrane concentration filtration can be mixed and evaporated through the mixing tank 6 and the concentration equipment 7, while the generated condensate is pumped back to the waste gas absorption tower 3 for recycling.

[0028] For example, such as Figure 1As shown, the present invention also includes a concentration device 7 whose discharge end is connected to the crystallization device 8 via a pipeline, a solid-liquid separation device 9 whose discharge end is connected to the solid-liquid separation device 9 via a pipeline, a mixing tank 6 whose liquid discharge end is connected to the solid-liquid separation device 9 via a pipeline, and a drying device 10 whose discharge end is connected to the solid-liquid separation device 9 via a pipeline.

[0029] In use, the material obtained after evaporation can be crystallized, centrifuged, and dried sequentially through the crystallization equipment 8, the solid-liquid separation equipment 9, and the drying equipment 10 to obtain ammonium fluoride products.

[0030] For example, such as Figure 1 As shown, the present invention also includes a gas outlet end of the drying device 10 connected to a waste gas absorption tower 3 via a pipeline, and a material outlet end of the drying device 10 connected to a packaging device 11.

[0031] In use, the crystallized material can be dried by the drying equipment 11, the waste gas absorption tower 3 and the packaging equipment 11. The resulting ammonium fluoride product is then automatically packaged by the packaging equipment 11. At the same time, the secondary waste gas generated by the drying equipment 11 is absorbed and treated by the waste gas absorption tower 3 so that the non-condensable gases meet the standards before being discharged to the outside.

[0032] By utilizing the above-mentioned combined treatment of fluoride and ammonia, fluoride-containing wastewater can undergo a series of processes such as waste gas absorption, pH adjustment, solid-liquid separation, evaporation and concentration, crystallization and drying to produce ammonium fluoride products. This enables photovoltaic enterprises to recover fluoride-containing wastewater and ammonia-containing waste gas through resource utilization, thereby reducing the environmental protection costs of enterprises.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A system for preparing high-purity ammonium fluoride through a combined fluorine-ammonia treatment process in the photovoltaic industry, characterized in that, It includes a waste pretreatment unit, a concentration unit, and a crystallization unit connected in sequence; The waste pretreatment unit includes a waste gas absorption tower, a collection tank and a purification system connected in sequence. The concentration unit is connected to the discharge end of the purification system, the inlet end of the crystallization unit is connected to the discharge end of the concentration unit, and the discharge end of the crystallization unit is also connected to a solid-liquid separation device. The solid-liquid separation device is connected to a drying device at the discharge end and to a recycling and processing unit at the liquid discharge end.

2. The system for preparing high-purity ammonium fluoride through combined fluorine and ammonia treatment in the photovoltaic industry according to claim 1, characterized in that, The waste gas absorption tower is connected to a concentrated fluoride wastewater conveying pipe and an ammonia-containing waste gas conveying pipe, respectively. The liquid outlet of the waste gas absorption tower is connected to a collection tank through a pipe, and the gas outlet discharges the remaining gas in compliance with standards.

3. The system for preparing high-purity ammonium fluoride through combined fluorine and ammonia processing in the photovoltaic industry according to claim 1, characterized in that, The liquid outlet of the collection tank is connected to the impurity removal system through a pipeline. The liquid phase of the impurity removal system is connected to the mixing tank through the liquid outlet pipeline, and the solid phase of the impurity removal system is discharged and collected through the solid waste port.

4. The system for preparing high-purity ammonium fluoride through combined fluorine and ammonia processing in the photovoltaic industry according to claim 3, characterized in that, The discharge end of the mixing tank is connected to the feed end of the concentration equipment via a pipeline; The concentration equipment is equipped with a condensate guide pipe, and the liquid outlet of the condensate guide pipe is connected to the liquid inlet of the waste gas absorption tower. The discharge end of the concentration equipment is connected to the inlet end of the crystallization equipment via a pipeline; The discharge end of the crystallization equipment is connected to the solid-liquid separation equipment via a pipeline, and the liquid discharge end of the solid-liquid separation equipment is connected to the mixing tank via a pipeline, while the discharge end is connected to the drying equipment via a pipeline.

5. The system for preparing high-purity ammonium fluoride through combined fluorine and ammonia processing in the photovoltaic industry according to claim 1, characterized in that, The recycling unit includes a condenser connected to the liquid outlet of the drying equipment. The condenser includes a condensate delivery pipe, and the liquid outlet of the condensate delivery pipe is connected to a mixing tank, while the gas outlet is connected to a waste gas absorption tower via a pipeline.

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