Online monitoring device for phosphogypsum and harmless treatment system, phosphoric acid production line

Abstract

This application discloses an online monitoring device for phosphogypsum, a harmless treatment system, and a phosphoric acid production line, solving the technical problem of low detection efficiency for phosphate, fluoride, and heavy metal content in phosphogypsum in the industry. The online monitoring device for phosphogypsum includes: a slurry tank for storing phosphogypsum slurry, the slurry tank being a stirring tank of the phosphogypsum treatment system; a sampling pipeline including a filter and a power unit connected in sequence, the input end of the sampling pipeline extending below the liquid surface of the slurry tank; a storage unit for storing filtrate, the storage unit being connected to the output end of the power unit; a first detection component for detecting at least one of the conductivity, temperature, turbidity, pH value, and TDS of the filtrate; and a second detection component for detecting the phosphate concentration, fluoride concentration, and heavy metal concentration of the filtrate. The monitoring device provided by this application has high monitoring efficiency.

Description

Technical Field

[0001] This application belongs to the field of phosphogypsum monitoring technology, specifically relating to an online phosphogypsum monitoring device and a harmless treatment system, as well as a phosphoric acid production line. Background Technology

[0002] The wet-process phosphoric acid production line uses sulfuric acid to react with phosphate rock to produce a mixed slurry of phosphoric acid and phosphogypsum. The slurry is filtered and washed to separate phosphoric acid and phosphogypsum. The residual fluorine and phosphorus content in the phosphogypsum directly affects the recovery rate of valuable components. At the same time, the entry of valuable components such as fluorine and phosphorus into the phosphogypsum increases environmental risks.

[0003] In related technologies, the detection of phosphate, fluoride and heavy metal content in phosphogypsum generally involves taking a phosphogypsum sample, sending it to the laboratory, adding water to form a slurry, and then conducting the test. However, this detection method has low efficiency. Summary of the Invention

[0004] To address the current technical problem of low detection efficiency for phosphate, fluoride, and heavy metal content in phosphogypsum, this application provides an online monitoring device for phosphogypsum, a harmless treatment system, and a phosphoric acid production line.

[0005] In a first aspect of this application, an online monitoring device for phosphogypsum is provided, comprising: A slurry tank is used to temporarily store phosphogypsum slurry, and the slurry tank is the mixing tank of the phosphogypsum treatment system; The sampling pipeline includes a filter and a power unit connected in sequence, and the input end of the sampling pipeline is used to extend below the liquid surface of the slurry tank; A storage unit for storing filtrate, wherein the storage unit is connected to the output end of the power unit; The first detection component is used to detect at least one of the following: conductivity, temperature, turbidity, pH value, and TDS of the filtrate. The second detection component is used to detect the phosphate concentration, fluoride concentration, and heavy metal concentration of the filtrate.

[0006] In some embodiments, the storage device is provided with an overflow port; The overflow outlet is connected to the waste liquid collection system of the phosphoric acid production line, or the overflow outlet is connected to the slurry tank.

[0007] In some embodiments, the storage device is a storage tank, the lower part of which is funnel-shaped, and the output end of the sampling pipeline is connected to the lower part of the storage tank.

[0008] In some embodiments, the slurry tank is provided with a discharge port, and the input end of the sampling pipeline is close to the discharge port.

[0009] In some embodiments, multiple filters are provided, which are connected in series and are all located on the input side of the power component.

[0010] In some embodiments, the first detection component includes a support and detection elements. The support is connected to the storage unit, and the detection elements are mounted on the support. There are five detection elements, which are a conductivity sensor, a temperature sensor, an online pH sensor, a turbidity sensor, and a TDS sensor. The detection probes of the conductivity sensor, temperature sensor, online pH sensor, turbidity sensor, and TDS sensor are all used to extend into the filtrate of the storage unit. In some embodiments, the second detection component includes an online phosphate concentration detector, an online fluoride concentration detector, and an online heavy metal concentration detector, wherein each of the online phosphate concentration detector, the online fluoride concentration detector, and the online heavy metal concentration detector is provided with a sampling tube for extending into the filtrate of the storage device.

[0011] In some embodiments, the height of the storage element is lower than the height of the liquid level in the slurry tank.

[0012] In a second aspect of this application, a harmless treatment system for phosphogypsum is provided, comprising: The mixing tank, the first mixing tank, and the second mixing tank are arranged sequentially along the process flow. The first aspect of the phosphogypsum online monitoring device, wherein the slurry tank of the phosphogypsum online monitoring device constitutes one of the slurry mixing tank, the first mixing tank and the second mixing tank.

[0013] In a third aspect of this application, a phosphoric acid production line is provided, comprising: The reaction assembly and the solid-liquid separation assembly are arranged sequentially according to the process. A phosphogypsum treatment system includes a third mixing tank and a first aspect of an online phosphogypsum monitoring device. The slurry tank of the online phosphogypsum monitoring device constitutes the third mixing tank, which is used to mix and stir the phosphogypsum filter cake separated by the solid-liquid separation component with water.

[0014] The online monitoring device for phosphogypsum provided in this application includes a slurry tank, a sampling pipeline, a storage unit, a first detection component, and a second detection component. The slurry tank is used to temporarily store phosphogypsum slurry and serves as the mixing tank for the phosphogypsum treatment system. The sampling pipeline includes a filter and a power unit connected in sequence, with the input end of the sampling pipeline extending below the liquid surface in the slurry tank. The storage unit is used to store the filtrate and is connected to the output end of the power unit. The first detection component is used to detect at least one of the following in the filtrate: conductivity, temperature, turbidity, pH value, and total dissolved solids. The second detection component is used to detect the phosphate concentration, fluoride concentration, and heavy metal concentration of the filtrate.

[0015] This application connects the sampling pipeline to the slurry tank of the phosphoric acid production line. The filtrate after filtration of the slurry in the slurry tank can be continuously and stably sent to the storage unit through the power component. The first detection component monitors at least one of the following parameters of the filtrate: conductivity, temperature, turbidity, pH value, and TDS. The second detection component detects the phosphate concentration, fluoride concentration, and heavy metal concentration in the filtrate, thereby realizing online monitoring of the phosphate, fluoride, and heavy metal content of phosphogypsum.

[0016] Compared to sending phosphogypsum samples to the laboratory, and referring to HJ557 for leaching phosphogypsum with water to detect phosphate, fluoride, and heavy metal content, the online monitoring device provided in this application eliminates the need for sending phosphogypsum samples to the laboratory. It can directly sample, filter, and temporarily store the phosphogypsum slurry in the slurry tank in a storage container, and the second detection component can immediately detect the filtrate in the storage container, resulting in high detection efficiency.

[0017] In addition, this application filters the phosphogypsum slurry before temporarily storing it in a storage room. The filtrate contains very few phosphogypsum particles, which reduces wear on the first and second detection components and improves their service life, accuracy, and stability. Attached Figure Description

[0018] Figure 1 A schematic diagram of the online monitoring device for phosphogypsum of this application is shown.

[0019] Explanation of reference numerals in the attached figures: 10-Slurry tank, 11-Agitator; 20-Sampling pipeline, 21-Filter, 22-Power component, 30-Storage component, 31-Overflow port, 40-First detection component, 41-Temperature sensor, 42-Online pH sensor, 43-Turbidity sensor, 44-Conductivity sensor, 50-Second detection component, 51-Sampling tube. Detailed Implementation

[0020] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] According to the first aspect of this application, an online monitoring device for phosphogypsum is provided, which can quickly detect conductivity, temperature, turbidity, pH value, TDS, phosphate concentration, fluoride concentration and heavy metal concentration, with high efficiency.

[0022] This application is described below with reference to the accompanying drawings and specific embodiments: Please see Figure 1 The online monitoring device for phosphogypsum provided in this application includes a slurry tank 10, a sampling pipeline 20, a storage unit 30, a first detection component 40, and a second detection component 50. The slurry tank 10 is used to temporarily store phosphogypsum slurry and serves as the mixing tank for the phosphogypsum treatment system. The sampling pipeline 20 includes a filter 21 and a power unit 22 connected in sequence, with the input end of the sampling pipeline 20 extending below the liquid surface of the slurry tank 10. The storage unit 30 is used to store the filtrate and is connected to the output end of the power unit 22. The first detection component 40 is used to detect at least one of the following in the filtrate: temperature, turbidity, pH value, and total dissolved solids. The second detection component 50 is used to detect the phosphate concentration, fluoride concentration, and heavy metal concentration of the filtrate.

[0023] The slurry tank 10 is a structure for temporarily storing phosphogypsum slurry. The slurry tank 10 can be a mixing tank for a phosphogypsum treatment system, which can be a phosphogypsum treatment system in a wet-process phosphoric acid production line or a phosphogypsum harmless treatment system. The phosphogypsum treatment system has multiple structures for holding phosphogypsum slurry, such as slurry mixing tanks or mixing tanks.

[0024] The sampling pipeline 20 delivers the phosphogypsum slurry from the slurry tank 10 to the storage unit 30. A filter 21 is installed on the sampling pipeline 20 to filter out large particles of phosphogypsum from the slurry, reducing the risk of these particles entering the storage unit 30, protecting the first detection component 40, preventing wear on the detection head of the first detection component 40 by large particles, and extending the service life of the first detection component 40. A power component 22, such as a power pump, is installed on the sampling pipeline 20 to continuously deliver the slurry from the slurry tank 10 to the storage unit 30, ensuring that the filtrate in the storage unit 30 is synchronized with the slurry in the slurry tank 10, enabling continuous online monitoring.

[0025] Storage unit 30 stores the filtrate after slurry filtration, a reactant formed during the phosphoric acid production of phosphogypsum, containing water-soluble components such as residual acid, fluorine, phosphorus, and heavy metals. Based on the solid-liquid mass transfer equilibrium principle, the conductivity, temperature, turbidity, pH value, and total dissolved solids (TDS) of the filtrate can provide feedback on the temperature, turbidity, pH value, and TDS of the phosphogypsum slurry during the phosphoric acid production line. The phosphoric acid production process can be adjusted based on these parameters. Turbidity refers to the degree of light scattering and absorption by insoluble substances (such as suspended particles and colloidal particles) in the filtrate. Total dissolved solids (TDS) refers to the sum of all inorganic salts and organic matter dissolved in water.

[0026] The first detection component 40 is an in-situ detection component, meaning that it can be directly detected without adding other reagents or undergoing other treatments. For example, it can detect at least one of the following: conductivity, temperature, turbidity, pH value, and total dissolved solids of the filtrate.

[0027] The second detection component 50 is an anatopic detection component, meaning that other reagents need to be added or the sample needs to be treated before it can be detected, such as the concentration of phosphate, fluoride, and heavy metals in the filtrate.

[0028] This application connects the sampling pipeline 20 to the mixing tank of the phosphogypsum treatment system. Through the power component 22, the filtrate after slurry filtration in the slurry tank 10 can be continuously and stably sent to the storage component 30 for the detection of temperature, turbidity, pH value, total dissolved solids, phosphate concentration, fluoride concentration and heavy metal concentration. This realizes online monitoring of phosphogypsum slurry. Moreover, the filtrate contains very few phosphogypsum particles, which reduces the wear of the detection probe of the first detection component 40 and the sampling tube of the second detection component 50, and improves the service life, accuracy and stability of the first detection component 40 and the second detection component 50.

[0029] In some embodiments, the slurry tank 10 is provided with a discharge port, through which the phosphogypsum slurry can enter the next process, such as entering the first mixing tank, so that the phosphogypsum slurry reacts with the first agent (e.g., steel slag, coal gangue, yellow phosphorus slag, fly ash, boiler ash, building material waste, water-quenched slag, red mud, aluminum ash, etc.) to carry out the harmless treatment of phosphogypsum.

[0030] As a sampling structure, the sampling pipeline 20 has its input end close to the discharge port in some embodiments. Since the slurry tank 10 is part of the phosphoric acid production line and requires continuous phosphoric acid production, the leaching time of the phosphogypsum and water mixture in the slurry tank 10 is not very long. This makes it difficult for phosphates, fluorides, and heavy metals in the phosphogypsum to be completely leached out. Therefore, the concentration of phosphates, fluorides, and heavy metals in the filtrate entering the storage container 30 through the sampling pipeline 20 may be lower than the actual concentration in the phosphogypsum slurry. With the inlet and outlet of the slurry tank 10 located on opposite sides, placing the input end of the sampling pipeline 20 close to the outlet ensures the longest travel path for the phosphogypsum slurry exiting the outlet. Therefore, the concentration of phosphates, fluorides, and heavy metals in the filtrate extracted by the sampling pipeline 20 is closest to the actual concentration in the phosphogypsum slurry, thereby improving the accuracy of online monitoring.

[0031] The filter 21 in the sampling pipeline 20 is located on the input side of the power unit 22. The filter 21 can filter out phosphogypsum particles, so that the filtrate entering the power unit 22 is free of phosphogypsum particles. This reduces wear on the power unit 22, extends its service life, and ensures the stability and accuracy of online continuous monitoring of the phosphogypsum slurry.

[0032] In some embodiments, please refer to Figure 1 The sampling pipeline 20 can have multiple filters 21, such as two, three, or four. These filters 21 are connected in series and are all located on the input side of the power unit 22. Using multiple filters 21 improves the filtration efficiency of the phosphogypsum slurry, further extending the service life of the power unit 22 and ensuring the stability of continuous online monitoring of the phosphogypsum slurry. Furthermore, having multiple filters 21 ensures that even if one filter 21 fails, the others can still function, reducing the risk of phosphogypsum entering the storage unit 30.

[0033] In some embodiments, one of the filters 21 can be directly installed at the input end of the sampling pipeline 20. By selecting the sampling filter 21, it is easy to replace or maintain it in case of blockage or failure, thereby reducing the impact on the online continuous monitoring of phosphogypsum slurry.

[0034] In one embodiment, the storage unit 30 can be a storage tank or a storage cup, etc., with a funnel-shaped lower part. The output end of the sampling pipe 20 is connected to the lower part of the storage unit 30. Although the phosphogypsum slurry has been filtered by the filter 21, small particles of phosphogypsum may still be present in the filtrate. Connecting the output end of the sampling pipe 20 to the lower part of the storage unit 30 reduces the disturbance of water flow to the liquid surface of the storage unit 30, reduces the amount of phosphogypsum reaching the liquid surface, reduces wear on the first detection component 40 and the second detection component 50, and improves the service life of the first detection component 40 and the second detection component 50. In another embodiment, the output end of the sampling pipe 20 can also be connected to the middle part of the storage unit 30, still enabling online monitoring of the phosphogypsum slurry.

[0035] In some embodiments, the storage unit 30 is provided with an overflow port 31. Since this application is an online continuous monitoring device for phosphogypsum, the phosphogypsum slurry in the slurry tank 10, after being filtered, continuously enters the storage unit 30. The overflow port 31 allows the filtrate to be discharged regularly from the overflow port 31, ensuring the accuracy of the phosphogypsum slurry monitoring. In other embodiments, the filtrate can also overflow directly from the opening of the storage unit 30, still ensuring the accuracy of the phosphogypsum slurry monitoring.

[0036] In some embodiments, the overflow port 31 can be connected to a waste liquid collection system of the phosphoric acid production line, thereby enabling the collection and treatment of the filtrate. In other embodiments, please refer to... Figure 1 The overflow port 31 can also be connected to the slurry tank 10, so that the filtrate sample can flow directly back into the slurry tank 10 and participate in the next process. Since the amount of filtrate in the storage container 30 is very small compared to the amount of phosphogypsum slurry in the slurry tank 10, even if the filtrate in the storage container 30 is returned to the slurry tank 10, the impact on the conductivity, temperature, turbidity, pH value, total dissolved solids, phosphate concentration, fluoride concentration, and heavy metal concentration of the phosphogypsum slurry in the slurry tank 10 can be ignored.

[0037] In some embodiments, the height of the storage unit 30 is lower than the liquid level in the slurry tank 10. The power unit 22 provides power so that the phosphogypsum slurry can move from the slurry tank 10 to the storage unit 30. If the height of the storage unit 30 is lower than the liquid level in the slurry tank 10, a height difference will be formed, which will facilitate the movement of the phosphogypsum slurry from the slurry tank 10 to the storage unit 30 and reduce the load on the power unit 22.

[0038] In some embodiments, the first detection component 40 includes a support and detection elements. The support is connected to the storage unit 30, and the detection elements are mounted on the support and extend into the filtrate in the storage unit 30. The detection elements can be one of a temperature sensor 41, a turbidity sensor 43, an online pH sensor 42, and a TDS sensor. Multiple detection elements can also be provided, for example, five detection elements, namely a conductivity sensor 44, a temperature sensor 41, a turbidity sensor 43, an online pH sensor 42, and a TDS sensor, which can simultaneously detect the conductivity, temperature, turbidity, pH value, and total dissolved solids of the filtrate. When multiple detection elements are provided, they are spaced apart and all mounted on the support.

[0039] In some embodiments, the second detection component 50 may include an online phosphate concentration detector, an online fluoride concentration detector, and an online heavy metal concentration detector. The sampling tubes 51 of the online phosphate concentration detector, the online fluoride concentration detector, and the online heavy metal concentration detector are all inserted into the filtrate of the storage device 30 so that the filtrate is sent into their respective interiors for detection of phosphate concentration, fluoride concentration, and heavy metal concentration. After the detection is completed, the filtrate is discharged.

[0040] The phosphate concentration in the filtrate is detected using an online phosphate concentration analyzer. Then, based on the ratio of phosphogypsum to water in slurry tank 10, the phosphate content in the phosphogypsum is determined. Compared to total phosphorus content detection, this method of measuring phosphate concentration requires converting insoluble phosphorus into soluble phosphorus; therefore, phosphate content detection is more efficient. Similarly, the fluoride concentration in the filtrate can be determined using an online fluoride concentration analyzer. Then, based on the ratio of phosphogypsum to water in slurry tank 10, the fluoride content in the phosphogypsum can be determined. Likewise, the heavy metal concentration in the filtrate can be determined using an online heavy metal concentration analyzer. Then, based on the ratio of phosphogypsum to water in slurry tank 10, the heavy metal content in the phosphogypsum can be determined.

[0041] The online phosphate concentration analyzer can determine phosphate concentration using spectrophotometry by measuring absorbance changes at a specific wavelength, or it can separate phosphate ions using an ion exchange column and then detect the phosphate concentration using a conductivity detector. The online phosphate concentration analyzer is equipped with a sampling tube 51 that extends into the filtrate. The sampling tube 51 is equipped with a power pump, which pumps the filtrate into the online phosphate concentration analyzer every few minutes for phosphate concentration detection. After detection, the filtrate is discharged through an outlet tube.

[0042] An online fluoride concentration detector, also known as an online fluoride analyzer or an online fluoride ion concentration monitor, uses a negative ion selective electrode to determine the fluoride concentration by measuring the electrode potential of the filtrate. It can also detect the concentrations of various heavy metals, including copper, hexavalent chromium, total chromium, zinc, total zinc, iron, total iron, nickel, total nickel, manganese, total manganese, cadmium, and lead.

[0043] Online phosphate concentration detectors, online fluoride concentration detectors, and online heavy metal concentration detectors are all existing technologies. For more details, please refer to the existing technology disclosures. This application will not elaborate further.

[0044] The online phosphate concentration detector, online fluoride concentration detector, and online heavy metal concentration detector of the second detection component 50 can be integrated and share a single sampling tube 51. Alternatively, each of the three can be set up independently, with each having its own sampling tube 51 to take filtrate from the storage unit 30 for detection.

[0045] In some embodiments, please refer to Figure 1 The slurry tank 10 is equipped with a stirrer 11, which can improve the mixing effect of phosphogypsum and water and improve the solid-liquid mass transfer efficiency. In some embodiments, the slurry tank 10 may also be equipped with an ultrasonic generator or a microwave generator. The ultrasonic generator can use ultrasound to stir the phosphogypsum and water, thereby improving the mixing efficiency; similarly, the microwave generator can use microwaves to stir the phosphogypsum and water, thereby improving the mixing efficiency. In still some embodiments, the slurry tank 10 may be equipped with a stirrer 11, an ultrasonic generator, and a microwave generator to synergistically improve the mixing efficiency of phosphogypsum and water.

[0046] Based on the same technical concept as the first aspect, the second aspect of this application provides a harmless treatment system.

[0047] The harmless treatment system of this application includes an online monitoring device for phosphogypsum according to any embodiment of the first aspect, a slurry mixing tank, a first mixing tank, a second mixing tank, and a filtration device. The slurry mixing tank, the first mixing tank, the second mixing tank, and the filtration device are arranged sequentially according to the process, and the slurry tank of the online monitoring device for phosphogypsum constitutes one of the slurry mixing tank, the first mixing tank, and the second mixing tank.

[0048] The slurry mixing tank is used to mix the phosphogypsum filter cake separated by the solid-liquid separation component of the phosphoric acid production line with water to form a phosphogypsum slurry with a concentration of 20wt% to 60wt%. In the first mixing tank, the phosphogypsum slurry in the slurry mixing tank reacts with a first reagent (such as steel slag, coal gangue, yellow phosphorus slag, fly ash, boiler ash, building material waste, water-quenched slag, red mud, aluminum ash, etc.) to form a first-stage reaction slurry. In the second mixing tank, the first-stage reaction slurry reacts with a second reagent (carbide slag, lime, alkaline slag, etc.) to form a second-stage reaction slurry. In the filtration equipment, the two-stage reaction slurries undergo solid-liquid separation to obtain filtrate and harmless phosphogypsum. At least one of the mixing tank, the first mixing tank, and the second mixing tank constitutes the slurry tank 10. Each of the mixing tank, the first mixing tank, and the second mixing tank is equipped with a sampling pipeline 20, a storage device 30, a first detection component 40, and a second detection component 50 to monitor the initial phosphogypsum, the gypsum harmless treatment process, and the final phosphogypsum quality, and to adjust the harmless treatment process accordingly. For more details regarding the phosphogypsum harmless treatment system and its related phosphogypsum harmless treatment process, please refer to the disclosure in CN119259663A; this application will not elaborate further.

[0049] Multiple online monitoring devices can be installed, such as two or three. When three online monitoring devices are installed, the slurry tanks of the three phosphogypsum online monitoring devices constitute a slurry mixing tank, a first mixing tank, and a second mixing tank, respectively, thereby realizing the monitoring of the harmless treatment process of phosphogypsum.

[0050] In a third aspect of this application, a phosphoric acid production line is provided, including an online monitoring device for phosphogypsum according to any embodiment of the first aspect.

[0051] A phosphoric acid production line, as a production line for producing phosphoric acid, generally includes a raw material pretreatment system, a reaction assembly, a solid-liquid separation assembly, a concentration system, a purification system, and a phosphogypsum treatment system.

[0052] The raw material pretreatment system, reaction assembly, solid-liquid separation assembly, concentration system, and purification system are arranged sequentially according to the process. The raw material pretreatment system can realize the functions of crushing and grinding phosphate rock, as well as storing and transporting phosphate rock and sulfuric acid. The reaction assembly can include a reaction vessel, in which phosphate rock and sulfuric acid can undergo an acidification reaction to produce phosphoric acid and phosphogypsum (mainly calcium sulfate). The solid-liquid separation assembly can include filtration equipment and washing devices. The filtration equipment can separate the phosphogypsum and liquid phosphoric acid generated in the reaction vessel to form phosphogypsum filter cake and liquid phosphoric acid. The concentration system can include an evaporator, which can concentrate the filtered liquid phosphoric acid. The purification system can include a multi-stage extraction tank, a decolorization tower, a defluorination device, and a desulfurization device. In the extraction tank, an extractant is used to extract the concentrated phosphoric acid to remove impurities; in the decolorization tower, activated carbon and other adsorbents are used to decolorize the phosphoric acid; the defluorination device and the desulfurization device remove fluorine and sulfur from the phosphoric acid, respectively. The phosphogypsum processing system includes a third mixing tank. The phosphogypsum filter cake separated by the solid-liquid separation component is mixed with water in the third mixing tank to form a slurry, which is then transported to the phosphogypsum slurry storage area. The slurry tank 10 of the phosphogypsum online monitoring device constitutes the third mixing tank. It is equipped with sampling pipeline 20, storage device 30, first detection component 40 and second detection component 50 to monitor temperature, turbidity, pH value, total dissolved solids, phosphate concentration, fluoride concentration and heavy metal concentration, and to detect the quality of the phosphogypsum sent to the storage area.

[0053] The phosphoric acid production line also includes a waste liquid collection system, with the overflow port of the storage unit connected to the waste liquid collection system to collect waste liquid. The wet-process phosphoric acid production line is prior art; further details can be found in existing technology publications, and will not be elaborated upon here.

[0054] The online monitoring device for phosphogypsum provided in this application has at least the following advantages: (1) This application achieves online sampling and filtration of slurry tank 10 and storage in storage device 30, and real-time online monitoring of filtrate temperature, turbidity, pH value, total dissolved solids, phosphate concentration, fluoride concentration and heavy metal concentration, realizing online monitoring of phosphogypsum quality with sampling and testing separation and quality synchronization. It has the characteristics of strong real-time performance, high degree of automation and high accuracy. It reduces the interference and wear of phosphogypsum slurry on the first detection component 40, which is an in-situ monitoring device, and improves the service life and detection accuracy of the first detection component 40. Moreover, the detection is stable and the operation and maintenance are convenient.

[0055] (2) The slurry tank 10 can be a stirring tank in the phosphogypsum slurry preparation system in the wet process phosphoric acid production line, or a slurry conditioning tank or stirring tank in the phosphogypsum harmless treatment system in the phosphoric acid production line, thus realizing the quality monitoring of phosphogypsum slurry in multiple process sections of the phosphoric acid production line.

[0056] (3) This application fully combines the physicochemical properties and harmless treatment of phosphogypsum, effectively solving the problem of online quality monitoring of phosphogypsum in the wet process phosphoric acid industry; it is simple to maintain and has low operating consumption; it effectively solves the problems of poor working conditions of wet process phosphoric acid, high salt content of phosphogypsum slurry, serious wear on equipment, and impact on monitoring accuracy.

[0057] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0059] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0060] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0061] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An on-line monitoring device for phosphogypsum, characterized in that, include: A slurry tank is used to temporarily store phosphogypsum slurry, and the slurry tank is the mixing tank of the phosphogypsum treatment system; The sampling pipeline includes a filter and a power unit connected in sequence, and the input end of the sampling pipeline is used to extend below the liquid surface of the slurry tank; A storage unit for storing filtrate, wherein the storage unit is connected to the output end of the power unit; The first detection component is used to detect at least one of the following: conductivity, temperature, turbidity, pH value, and TDS of the filtrate. The second detection component is used to detect the phosphate concentration, fluoride concentration, and heavy metal concentration of the filtrate.

2. The phosphogypsum online monitoring device according to claim 1, characterized in that, The storage device is provided with an overflow port; The overflow outlet is connected to the waste liquid collection system of the phosphoric acid production line, or the overflow outlet is connected to the slurry tank.

3. The on-line monitoring device for phosphogypsum according to claim 2, characterized in that, The storage device is a storage tank, the lower part of which is funnel-shaped, and the output end of the sampling pipeline is connected to the lower part of the storage tank.

4. The phosphogypsum on-line monitoring device according to any one of claims 1-3, characterized in that, The slurry tank is provided with a discharge port, and the input end of the sampling pipeline is close to the discharge port.

5. The phosphogypsum on-line monitoring device according to any one of claims 1-3, characterized in that, The filter is provided in multiple units, which are connected in series and are all located on the input side of the power component.

6. The phosphogypsum on-line monitoring device according to any one of claims 1-3, characterized in that, The first detection component includes a support and detection elements. The support is connected to the storage unit, and the detection elements are installed on the support. There are five detection elements, which are a conductivity sensor, a temperature sensor, an online pH sensor, a turbidity sensor, and a TDS sensor. The detection probes of the conductivity sensor, the temperature sensor, the online pH sensor, the turbidity sensor, and the TDS sensor are all used to extend into the filtrate of the storage unit.

7. The phosphogypsum on-line monitoring device according to any one of claims 1-3, characterized in that, The second detection component includes an online phosphate concentration detector, an online fluoride concentration detector, and an online heavy metal concentration detector. Each of the online phosphate concentration detector, the online fluoride concentration detector, and the online heavy metal concentration detector is equipped with a sampling tube for inserting into the filtrate of the storage device.

8. The phosphogypsum on-line monitoring device according to any one of claims 1-3, characterized in that, The height of the storage device is lower than the height of the liquid level in the slurry tank.

9. A detoxification system, characterized by, include: The slurry mixing tank, the first mixing tank, and the second mixing tank are arranged sequentially along the process. The phosphogypsum online monitoring device according to any one of claims 1-8, wherein the slurry tank of the phosphogypsum online monitoring device constitutes one of the slurry mixing tank, the first mixing tank, and the second mixing tank.

10. A phosphoric acid production line, characterized by, include: The reaction assembly and the solid-liquid separation assembly are arranged sequentially according to the process. A phosphogypsum treatment system includes a third mixing tank and an online phosphogypsum monitoring device according to any one of claims 1-8, wherein the slurry tank of the online phosphogypsum monitoring device constitutes the third mixing tank, and the third mixing tank is used to mix and stir the phosphogypsum filter cake separated by the solid-liquid separation component with water.

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