Continuous purification equipment for ferrous sulfate

Abstract

The utility model discloses continuous purification equipment for ferrous sulfate, which comprises a two-stage pretreatment device and a purification device which are connected with a ferrous sulfate conveying pipeline and an impurity removal agent conveying pipeline, the top end of the purification device is connected with a ferrous sulfate tank used for collecting supernate, and the bottom of the purification device is provided with a drain outlet used for being connected with a solid-liquid separation device. According to the device, the ferrous sulfate purification process is simplified, the labor cost is reduced, and the purification efficiency is greatly improved; the residence time of the mixed solution can be controlled through the combination of the honeycomb drainage assembly and the volume of the purification device, more impurity ions are deposited to the bottom to be separated out through pretreatment and purification treatment, and the content and turbidity of impurities in the purified ferrous sulfate solution are greatly reduced; the solid-liquid separation device further recovers and filters clear liquid, so that the recovery rate of the iron element is improved, and the loss of resources is reduced; the device is simple in structure, convenient to operate and easy to popularize.

Description

Technical Field

[0001] This utility model relates to a purification device, and more particularly to a continuous purification device for ferrous sulfate. Background Technology

[0002] Ferric phosphate (FePO4) is an important chemical raw material widely used in ceramics, coatings, battery materials, and other fields. Ferrous sulfate (FeSO4) is the main iron source in the preparation of ferric phosphate. However, industrial-grade ferrous sulfate often contains various impurities, such as heavy metal ions (lead, cadmium, mercury, etc.), non-metallic elements (arsenic, phosphorus, etc.), and other soluble salts. The content of the impurity Ti can severely affect the properties of ferric phosphate materials, especially in the downstream lithium iron phosphate material doping and modification process, causing fluctuations in performance indicators and failing to achieve the desired modification effect. Currently, the purification of ferrous sulfate slurry in ferric phosphate production is an intermittent process. A certain amount of slurry is mixed with a certain amount of impurity removal agent in a reactor, and after the reaction is completed under controlled conditions, the material is transferred to a plate and frame filter press for solid-liquid separation to obtain a ferrous sulfate solution. This intermittent production process involves high equipment investment, low filtration efficiency, and the easy reintroduction of impurities during the material transfer process, resulting in a time-consuming, labor-intensive, and inefficient production process. Utility Model Content

[0003] Purpose of the utility model: The purpose of this utility model is to improve the purification efficiency and effect of ferrous sulfate solution and to provide a continuous purification device for ferrous sulfate.

[0004] Technical solution: The ferrous sulfate continuous purification equipment of this utility model includes a two-stage pretreatment device and a purification device connected to the ferrous sulfate conveying pipeline and the impurity removal agent conveying pipeline. The inlet of the purification device is located at the bottom. The top of the purification device is connected to a ferrous sulfate tank for collecting the supernatant. The bottom of the purification device is provided with a drain port for connecting to a solid-liquid separation device.

[0005] Furthermore, the purification device is internally equipped with a honeycomb drainage assembly and a first heating device. The feed inlet of the purification device is located at the bottom of the honeycomb drainage assembly, which has an inclination angle of 45-60° and is arranged in 3-5 groups. A larger inclination angle of the honeycomb drainage assembly can increase the residence time of the mixed solution in the container; however, an excessively large inclination angle is not conducive to the downward aggregation of impurity particles, thus hindering the purification effect. With feed from the bottom and discharge from the top of the purification device, the combination and inclination of the honeycomb drainage assembly, combined with the volume of the purification device, can control the residence time of the mixed solution. The temperature of the mixed solution is controlled by the first heating device, maintaining it at approximately 50°C, allowing for sufficient reaction and enabling more impurity ions to deposit at the bottom and be separated.

[0006] Furthermore, the first pretreatment component of the two-stage pretreatment device is equipped with a baffle tube to extend the residence time of the mixed solution and a second temperature control device, with the temperature controlled at approximately 40°C. The second pretreatment component is equipped with a third temperature control device, with the temperature controlled at approximately 50°C. An inlet connected to the first pretreatment component is located at the top, and an outlet connected to the purification device is located at the bottom. The baffle design increases the residence time of the solution within the treatment components, and the gradually increasing temperature increases the activity of ions in the mixed solution, promoting the reaction rate between impurity ions and the purification agent. This allows more impurity ions to be retained in the purification device, improving the purity of the ferrous sulfate solution.

[0007] Furthermore, a pipeline mixing device is installed between the ferrous sulfate conveying pipeline and the impurity removal agent conveying pipeline to increase the uniformity of solution mixing. The device is equipped with a pH monitoring device to monitor the pH value of the mixed solution. The ferrous sulfate solution and the impurity removal agent are fully mixed. The pH value of the mixed solution is adjusted by adjusting the amount of impurity removal agent to reach the required pH value before entering the subsequent processing device.

[0008] Furthermore, the top of the solid-liquid separation device is connected to a ferrous sulfate tank via a pipe, and a filter residue collection device is installed at the bottom to further collect and purify the ferrous sulfate in the turbid flotation collected at the bottom of the device, preventing the loss of iron resources and improving resource utilization.

[0009] Furthermore, a collection tank for collecting and temporarily storing turbid flotation liquid is provided between the solid-liquid separation device and the purification device, and a stirring device is installed inside. The collection tank can prevent the smooth progress of the preceding purification process from being affected by the untimely operation of the solid-liquid separation device, and the stirring device promotes the further reaction and precipitation of unreacted impurity ions, which are then retained.

[0010] Beneficial effects: Compared with the prior art, this utility model has the following advantages: 1. The device simplifies the purification process of ferrous sulfate, reduces labor costs, and greatly improves purification efficiency; 2. It greatly reduces the content of impurities and turbidity in the purified ferrous sulfate solution; 3. The solid-liquid separation device further recovers the filtered precipitate, improves the recovery rate of iron elements, and reduces resource loss; 4. The device has a simple structure, is easy to operate, and is easy to promote. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the purification device of this utility model;

[0013] Figure 3 This is a schematic diagram of the honeycomb drainage component of this utility model. Detailed Implementation

[0014] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0015] like Figure 1 The illustrated ferrous sulfate continuous purification equipment includes a ferrous sulfate delivery pipeline 1 and a purifying agent delivery pipeline 2, with a mixing device 11 and a pH monitoring device installed between them to increase solution mixing uniformity. The mixed solution, after mixing and regulation, sequentially passes through a first pretreatment component 3, a second pretreatment component 4, a purification device 5, a solid-liquid separation device 10, and a ferrous sulfate tank 7. Figure 2 and 3 As shown, the purification device 5 is equipped with a honeycomb flow guide assembly 6 and a first heating device. The feed inlet of the purification device 5 is located at the bottom of the honeycomb flow guide assembly 6. The honeycomb flow guide assembly 6 is set in one group with an inclination of 60° (or multiple groups can be set according to the residence time of the mixed solution and the efficiency of impurity interception, with an inclination range of 45-60°). The first pretreatment assembly 3 is equipped with a baffle tube and a second temperature control device. The second pretreatment assembly 4 is equipped with a third temperature control device, a feed inlet connected to the first pretreatment assembly 3 at the top, and a discharge outlet connected to the purification device 5 at the bottom. The top of the purification device 5 is connected to a ferrous sulfate tank 7 for collecting the supernatant. The bottom of the purification device 5 is equipped with a drain outlet 8. A collection tank 9 and a solid-liquid separation device 10 are set behind the drain outlet 8. A stirring device is installed in the collection tank 9. The top of the solid-liquid separation device 10 is connected to the ferrous sulfate tank 7 through a pipe, and a filter residue collection device 12 is set at the bottom.

[0016] In use, dissolved ferrous sulfate slurry is transported through ferrous sulfate conveying pipe 1, and a measured amount of impurity remover is transported through impurity remover conveying pipe 2. The two are thoroughly mixed in the pipe mixing device 11, and the pH is adjusted to 1.6±0.2 by a pH monitoring device before being transported to subsequent process equipment. The mixed solution enters the first pretreatment component 3 for further mixing under a 40℃ incubation condition, then enters the second pretreatment component 4 for further mixing under a 50℃ condition. After further mixing, it enters through the inlet at the bottom of the purification device 5, flows through the honeycomb drainage component 6, and remains at 50℃ for approximately 3 hours to allow for sufficient reaction and purification. Solid-liquid separation is then performed to collect the ferrous sulfate slurry. The ferrous sulfate slurry collected from the supernatant of the purification device 5 accounts for approximately 80% of the total recovery, while the turbid flotation collected through the bottom drain 8 yields approximately 20% of the ferrous sulfate slurry after solid-liquid separation. Continuous recovery of 1000m³... 3The purified ferrous sulfate slurry was sampled and tested for indicators such as turbidity, impurity ion concentration (taking the content of impurity Ti as an example), and total iron concentration. The impurity Ti content was 0.050 ppm, the total iron concentration was 60.5 g / L, and the turbidity was 9 NTU. Compared with the existing intermittent production method, the impurity Ti content was reduced by 75%, the turbidity was reduced, and the total iron concentration was increased. The production time was reduced from 20 hours to 7 hours, which greatly improved production efficiency and reduced labor costs.

Claims

1. A continuous ferrous sulfate purification apparatus, characterized by, The two-stage pretreatment device is connected with a ferrous sulfate delivery pipeline (1) and a impurity removing agent delivery pipeline (2), the purification device (5) is provided with a feed inlet at the bottom end, the top end of the purification device (5) is connected with a ferrous sulfate tank (7) for collecting supernatant, and the bottom of the purification device (5) is provided with a blow-off port (8) connected with a solid-liquid separation device (10).

2. The ferrous sulfate continuous purification apparatus according to claim 1, characterized by, The purification device (5) is provided with a honeycomb drainage assembly (6) and a first heating device.

3. The ferrous sulfate continuous purification apparatus according to claim 2, characterized by, The inclination of the honeycomb drainage assembly (6) is 45-60°.

4. The ferrous sulfate continuous purification apparatus according to claim 2, characterized by, The honeycomb drainage assembly (6) is provided with 3-5 groups.

5. The ferrous sulfate continuous purification apparatus according to claim 1, characterized by, The first pretreatment assembly (3) of the two-stage pretreatment device is provided with a baffle pipe for prolonging the residence time of the mixed solution and a second temperature control device, and the second pretreatment assembly (4) is provided with a third temperature control device, a feed inlet connected with the first pretreatment assembly (3) at the top and a discharge outlet connected with the purification device (5) at the bottom.

6. The ferrous sulfate continuous purification apparatus according to claim 1, characterized by, The pipeline mixing device (11) is arranged between the ferrous sulfate delivery pipeline (1) and the impurity removing agent delivery pipeline (2) for increasing the uniformity of solution mixing.

7. The ferrous sulfate continuous purification apparatus according to claim 6, characterized by, The pipeline mixing device (11) is provided with a pH monitoring device for monitoring the pH value of the mixed solution.

8. The ferrous sulfate continuous purification apparatus according to claim 1, characterized by, The top of the solid-liquid separation device (10) is connected with the ferrous sulfate tank (7) through a pipeline, and the bottom is provided with a filter residue collecting device (12).

9. The ferrous sulfate continuous purification apparatus according to claim 8, characterized by, The solid-liquid separation device (10) is provided with a collecting tank (9) arranged between the solid-liquid separation device (10) and the purification device (5) for collecting and temporarily storing the turbid floating liquid.

10. The ferrous sulfate continuous purification apparatus according to claim 9, characterized by, The collecting tank (9) is provided with a stirring device.

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