A wet-process phosphoric acid purification device based on barium carbonate gradient desulfurization

Abstract

The utility model relates to the technical field of wet-process phosphoric acid production equipment, specifically to a kind of wet-process phosphoric acid purification device based on barium carbonate gradient desulfurization.The wet-process phosphoric acid purification device based on barium carbonate gradient desulfurization of the application at least includes three mutually connected desulfurization reaction components, the desulfurization reaction component is equipped with the mixing uniform component of preventing barium sulfate scale, the discharge port of the desulfurization reaction component is connected with liquid pumping component, the output end of the liquid pumping component is connected with filter component, the output end of the filter component is equipped with buffer component and collection component, the output end of the buffer component is connected with the feed inlet of the filter component, thereby realizing the control limit of multiple-stage feeding breakthrough single variable, significantly improving desulfurization efficiency, while shortening the overall desulfurization reaction time;And by-product barium sulfate purity is improved, can be directly resource utilization, effectively reduce solid waste treatment cost.

Description

Technical Field

[0001] This utility model relates to the technical field of wet-process phosphoric acid production equipment, specifically to a wet-process phosphoric acid purification device based on barium carbonate gradient desulfurization. Background Technology

[0002] Phosphoric acid is an important chemical raw material and intermediate, widely used in fertilizers, electronics, pharmaceuticals, food, and other industries. Currently, the main production processes for phosphoric acid include the thermal process and the wet process. Due to the high energy consumption, significant environmental pollution, and high requirements for phosphate rock grade, the production cost of thermal phosphoric acid is continuously rising against the backdrop of increasingly tight global energy supplies. Therefore, the wet process is gradually becoming the mainstream alternative process.

[0003] However, wet-process phosphoric acid has a high impurity content, mainly including anions such as SO42-. 2- F - It also contains cations such as Fe, Al, Mg, Ca, and Si. Industrial phosphoric acid end products typically require high purity, therefore wet-process phosphoric acid must undergo purification treatment to meet the corresponding quality indicators.

[0004] In the wet-process phosphoric acid production, the decomposition of phosphate rock with sulfuric acid often introduces excess sulfuric acid, resulting in high sulfate (SO4) content in the final product. 2- Excessive content can affect the quality of industrial-grade or food-grade phosphoric acid.

[0005] Traditional desulfurization methods often use calcium carbonate or barium sulfide, but these methods generally suffer from low desulfurization efficiency, difficult-to-treat byproducts, residual barium ions, and poor filtration performance. Furthermore, existing barium carbonate desulfurization processes typically involve a single-feed operation, which can easily lead to agglomeration due to localized supersaturation. Additionally, the reaction endpoint is difficult to control precisely, further limiting the desulfurization effect and process stability. Therefore, it is necessary to systematically optimize this desulfurization process to improve desulfurization efficiency, enhance product filtration performance, and achieve effective control of the reaction endpoint. Utility Model Content

[0006] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a wet phosphoric acid purification device based on barium carbonate gradient desulfurization.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A wet phosphoric acid purification device based on barium carbonate gradient desulfurization includes at least three desulfurization reaction components connected in series. Each desulfurization reaction component is equipped with a mixing component to prevent barium sulfate scaling. The outlet of each desulfurization reaction component is connected to a liquid extraction component. The output end of the liquid extraction component is connected to a filter component. The output end of the filter component is provided with a buffer component and a collection component. The output end of the buffer component is connected to the inlet of the filter component.

[0008] Furthermore, the desulfurization reaction component is a desulfurization reactor, which is arranged in a conical shape.

[0009] Furthermore, the mixing component includes a stirrer and an ultrasonic disperser. The stirrer is installed inside the desulfurization reactor, and the ultrasonic disperser is installed on the bottom of the outer surface of the desulfurization reactor.

[0010] Furthermore, the desulfurization reactor is connected to a low-pressure steam inlet, a tail gas outlet, a barium carbonate inlet, and a phosphoric acid inlet.

[0011] Furthermore, the liquid extraction assembly is a first centrifugal pump, which comprises three pumps, each installed at the outlet of the desulfurization reactor.

[0012] Furthermore, the filtration assembly is a silicon carbide filter, and the inlet of the silicon carbide filter is connected to the outlet of the first centrifugal pump.

[0013] Furthermore, the silicon carbide filter comprises three, which are arranged in parallel.

[0014] Furthermore, the silicon carbide filter is equipped with a phosphoric acid drain port, and an air compressor is connected to the pipe of the phosphoric acid drain port.

[0015] Furthermore, the buffer component is a desulfurization slurry circulation tank, the inlet of which is connected to the outlet of the three silicon carbide filters via a pipe; the outlet of which is connected to the inlet of the three silicon carbide filters via a second centrifugal pump.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial effects: 1. This application achieves multi-stage feeding by using three interconnected desulfurization reaction components, breaking through the control limitations of a single variable. Specifically, after the first addition of barium carbonate, fine barium sulfate is formed after the reaction. Then, 30% of the remaining required barium carbonate is added to the second reaction tank. The fine barium sulfate generated in the first tank acts as crystal nuclei, which shortens the reaction time of the second reaction and allows the fine barium sulfate to grow larger, making it easier to filter. This solves the problem of the difficulty in filtering the fine barium sulfate formed during desulfurization and also promotes the formation of large barium sulfate crystals.

[0017] 2. This application adopts a multi-stage feeding process, which significantly improves desulfurization efficiency and shortens the overall desulfurization reaction time; and the purity of the by-product barium sulfate is improved, which can be directly utilized as a resource, effectively reducing the cost of solid waste treatment.

[0018] 3. The reaction apparatus of this application adopts a series structure and a conical reaction tank design, combined with an ultrasonic disperser at the bottom of the tank, to achieve efficient dispersion of reactants and precise control of the barium sulfate crystallization process, thereby further improving reaction efficiency and product quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a wet phosphoric acid purification device based on barium carbonate gradient desulfurization in a preferred embodiment of this utility model.

[0020] Figure reference numerals: 101, desulfurization reactor; 102, ultrasonic disperser; 103, first centrifugal pump; 104, desulfurization slurry circulation tank; 105, silicon carbide filter; 106, agitator; 107, second centrifugal pump; 108, air compressor. Detailed Implementation

[0021] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0022] Reference Figure 1 As shown in the preferred embodiment of this utility model, a wet phosphoric acid purification device based on barium carbonate gradient desulfurization includes at least three desulfurization reaction components connected in series. Each desulfurization reaction component is equipped with a mixing component to prevent barium sulfate scaling. The outlet of each desulfurization reaction component is connected to a liquid extraction component, and the output end of the liquid extraction component is connected to a filter component. The output end of the filter component is equipped with a buffer component and a collection component. The output end of the buffer component is connected to the inlet of the filter component. This allows for multi-stage feeding, overcoming the limitations of single-variable control, significantly improving desulfurization efficiency, and shortening the overall desulfurization reaction time. Furthermore, the purity of the byproduct barium sulfate is increased, allowing for direct resource utilization and effectively reducing solid waste treatment costs.

[0023] As a preferred embodiment of the present invention, it may also have the following additional technical features: the desulfurization reaction component is a desulfurization reaction vessel 101, which is arranged in a conical shape.

[0024] In this embodiment, the mixing component includes a stirrer 106 and an ultrasonic disperser 102. The stirrer 106 is installed inside the desulfurization reactor 101, and the ultrasonic disperser 102 is installed on the bottom of the outer surface of the desulfurization reactor. The desulfurization reactor 101 is connected to a low-pressure steam inlet, a tail gas outlet, a barium carbonate inlet, and a phosphoric acid inlet. This facilitates staged feeding, i.e., a gradient desulfurization method. The first feeding is 50% barium carbonate. After reacting for 4 hours, the remaining 30% of the required barium carbonate is fed into the second reaction tank. After reacting for another 4 hours, the remaining 20% ​​is fed into the third tank. This improves desulfurization efficiency and solves the problem of long reaction time leading to the formation of coarse barium sulfate, thus addressing the difficulty in filtering fine barium sulfate.

[0025] In this embodiment, the liquid extraction component is a first centrifugal pump 103, and there are three first centrifugal pumps 103, which are respectively installed at the discharge port of the desulfurization reactor 101.

[0026] In this embodiment, the filter assembly is a silicon carbide filter 105. The inlet of the silicon carbide filter 105 is connected to the outlet of the first centrifugal pump 103. There are three silicon carbide filters 105, which are arranged in parallel. The silicon carbide filter 105 is provided with a phosphoric acid drain port, and an air compressor 108 is connected to the pipe of the phosphoric acid drain port.

[0027] In this embodiment, the buffer component is a desulfurization slurry circulation tank 104. The inlet of the desulfurization slurry circulation tank 104 is connected to the outlet of the three silicon carbide filters 105 through a pipe. The outlet of the desulfurization slurry circulation tank is connected to the inlet of the three silicon carbide filters through a second centrifugal pump 107. The desulfurization slurry circulation tank plays a buffer circulation role. The precision filter filters the slurry to be filtered by pressurization, which is a kind of "cross-flow filtration" fluid separation process. The raw liquid flows at high speed in the membrane tube. Under pressure, the clarified permeate containing small molecules permeates outward along the direction perpendicular to it through the dense membrane layer, while the turbid concentrate containing large molecules is retained, thereby achieving the purpose of clarification, separation, concentration and purification of the fluid.

[0028] Without causing conflict, those skilled in the art can freely combine and use the above-mentioned additional technical features.

[0029] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A wet phosphoric acid purification device based on barium carbonate gradient desulfurization, characterized in that: It includes at least three desulfurization reaction components connected in series. Each desulfurization reaction component is equipped with a mixing component to prevent barium sulfate scaling. The outlet of each desulfurization reaction component is connected to a liquid extraction component. The output end of the liquid extraction component is connected to a filter component. The output end of the filter component is equipped with a buffer component and a collection component. The output end of the buffer component is connected to the inlet of the filter component. The desulfurization reaction component is a desulfurization reactor (101), which is arranged in a conical shape. The mixing component includes a stirrer and an ultrasonic disperser (102). The stirrer is installed inside the desulfurization reactor (101), and the ultrasonic disperser (102) is installed on the bottom of the outer surface of the desulfurization reactor (101).

2. The wet phosphoric acid purification device based on barium carbonate gradient desulfurization according to claim 1, characterized in that: The desulfurization reactor (101) is connected to a low-pressure steam inlet, a tail gas outlet, a barium carbonate inlet, and a phosphoric acid inlet.

3. The wet phosphoric acid purification device based on barium carbonate gradient desulfurization according to claim 1, characterized in that: The liquid extraction assembly is a first centrifugal pump (103), and there are three first centrifugal pumps (103), which are respectively installed at the discharge port of the desulfurization reactor (101).

4. The wet phosphoric acid purification device based on barium carbonate gradient desulfurization according to claim 3, characterized in that: The filter assembly is a silicon carbide filter (105), and the inlet of the silicon carbide filter (105) is connected to the outlet of the first centrifugal pump (103).

5. The wet phosphoric acid purification device based on barium carbonate gradient desulfurization according to claim 4, characterized in that: The silicon carbide filter (105) comprises three, and the three silicon carbide filters (105) are arranged in parallel.

6. The wet phosphoric acid purification device based on barium carbonate gradient desulfurization according to claim 4, characterized in that: The silicon carbide filter (105) is provided with a phosphoric acid drain port, and an air compressor (108) is connected to the pipe of the phosphoric acid drain port.

7. The wet phosphoric acid purification device based on barium carbonate gradient desulfurization according to claim 6, characterized in that: The buffer assembly is a desulfurization slurry circulation tank (104). The inlet of the desulfurization slurry circulation tank (104) is connected to the outlet of the three silicon carbide filters (105) through a pipe. The outlet of the desulfurization slurry circulation tank (104) is connected to the inlet of the three silicon carbide filters (105) through a second centrifugal pump (107).

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