Wet-process phosphoric acid impurity removal device

Abstract

The utility model discloses a wet-process phosphoric acid impurity removal device. The wet-process phosphoric acid impurity removal device comprises an operation cabin, an adding cabin, a discharging pipe, a precipitation cabin and a filtering mechanism, the precipitation cabin is arranged at the left end of the operation cabin, the top end of the precipitation cabin is connected with the filtering mechanism, the filtering mechanism comprises the through pipe, the feeding pipe, the expansion seat and other assemblies, wet-process phosphoric acid can enter the through pipe through the feeding pipe and is repeatedly filtered through the multiple sets of filtering discs and other assemblies in the through pipe, and preliminary impurity removal can be conducted on the wet-process phosphoric acid; then the wet-process phosphoric acid is discharged into the precipitation cabin for precipitation, the purity of the wet-process phosphoric acid is further improved, finally, the wet-process phosphoric acid is discharged into the operation cabin for final impurity removal operation, the impurity removal effect can be improved through pretreatment of the wet-process phosphoric acid, the filter disc and other assemblies in the through pipe can be taken out for cleaning, and the situation that the filter disc is blocked after being used for a long time, and the filter effect is affected is avoided.

Description

Technical Field

[0001] The utility model relates to the field of wet-process phosphoric acid, in particular to a device for removing impurities from wet-process phosphoric acid. Background Technique

[0002] Wet-process phosphoric acid is a general term for phosphoric acid obtained by decomposing phosphate rock with sulfuric acid, nitric acid or hydrochloric acid. The method of decomposing phosphate rock with sulfuric acid to obtain phosphoric acid is the most basic method in the production of wet-process phosphoric acid. The wet production method is to decompose phosphate rock powder with inorganic acid, separate crude phosphoric acid, and then obtain phosphoric acid products after purification. Wet-process phosphoric acid has a cost 20% - 30% lower than thermal-process phosphoric acid. After being purified by appropriate methods, the product purity can be comparable to that of thermal-process phosphoric acid. The wet-process phosphoric acid process is in the dominant position in phosphoric acid production.

[0003] However, due to the characteristics of raw materials and processes, wet-process phosphoric acid contains more impurities, such as magnesium phosphates and free sulfuric acid, etc., which affect the quality process of phosphoric acid. Therefore, it is necessary to remove impurities from wet-process phosphoric acid to improve its purity.

[0004] Most of the existing devices for removing impurities from wet-process phosphoric acid carry out impurity removal and purification by filtration. The means are relatively single, and the impurity removal effect is relatively limited. After long-term filtration, the filter components inside may cause pore blockage, affecting the filtration effect, and have certain limitations. Content of the Utility Model

[0005] Therefore, to solve the above deficiencies, the utility model provides a device for removing impurities from wet-process phosphoric acid.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions: A device for removing impurities from wet-process phosphoric acid, including an operation chamber capable of performing impurity removal operations. The top surface of the operation chamber is connected with no less than two groups of addition chambers. The right bottom end of the operation chamber is connected with a discharge pipe for discharging wet-process phosphoric acid. It also includes a precipitation chamber arranged at the left top end of the operation chamber, and a filtering mechanism is connected to the top end of the precipitation chamber;

[0007] The filtering mechanism includes a through pipe, a feed pipe and an expansion seat. The bottom end of the through pipe is communicated with the top end of the precipitation chamber, the top end is connected with the feed pipe, and the right end of the through pipe is connected with the expansion seat.

[0008] Preferably, the right bottom end of the precipitation chamber is connected with the left top end of the operation chamber through a transition pipe, and a discharge pipe is connected to the bottom surface of the precipitation chamber.

[0009] Preferably, a set of openings are provided at the left end of the through pipe, and a set of hatch doors are hinged at the rear end of the openings. Two sets of flanges are provided at a position near the top of the opening inside the through pipe. A set of driven gears are provided between the two sets of flanges. And a set of fixing frames are provided at a position near the bottom of the opening inside the through pipe. A set of connecting shafts are provided between the driven gears and the fixing frames. A number of filter discs are equidistantly provided on the outer side of the connecting shafts.

[0010] Preferably, the middle of the driven gear is hollowed out and a set of brackets are provided. A set of limit rings are provided at the middle end of the brackets.

[0011] Preferably, a set of motors are provided at the top end inside the expansion base. The top end of the driving shaft of the motor is connected with a set of gears. The left end of the gear penetrates and extends into the through pipe and meshes with the right end of the driven gear.

[0012] Preferably, the bracket is in a shape similar to the Chinese character 'da' (big), the limit ring is in an inverted 'C' shape, and a convex block is provided at the right end inside the limit ring.

[0013] Preferably, a cover plate is provided at the top end of the connecting shaft and can be clamped at the top end of the limit ring. A groove corresponding to the convex block is provided at the right top end of the connecting shaft.

[0014] Preferably, a sealing ring is provided on the outer side of the filter disc and can contact the inner sides of the through pipe and the hatch door. A sealing strip is provided at the contact position between the hatch door and the opening.

[0015] The beneficial effects of the present utility model:

[0016] Through the sedimentation tank provided at the left end of the operation tank in the present utility model, the top end of the sedimentation tank is connected with a filtering mechanism. The filtering mechanism includes components such as a through pipe, a feed pipe, and an expansion base. Wet-process phosphoric acid can enter the through pipe through the feed pipe and is repeatedly filtered through a number of filter discs and other components inside the through pipe. The wet-process phosphoric acid can be preliminarily purified, then discharged into the sedimentation tank for sedimentation, further improving the purity of the wet-process phosphoric acid. Finally, it is discharged into the operation tank for the final purification operation. By preprocessing the wet-process phosphoric acid, the purification effect can be improved. And the filter discs and other components inside the through pipe can also be taken out for cleaning to avoid blockage caused by long-term use of the filter discs, affecting the filtering effect. Description of the Drawings

[0017] Figure 1 is the structural schematic diagram of the present utility model;

[0018] Figure 2 is the structural schematic diagram of the filtering mechanism of the present utility model;

[0019] Figure 3 is the internal structural schematic diagram of the through pipe of the present utility model;

[0020] Figure 4 is Figure 3 the enlarged schematic diagram of the structure at A;

[0021] Figure 5 is a schematic top view structure diagram of the driven gear of the present utility model;

[0022] Figure 6 is a schematic top view structure diagram of the fixing bracket of the present utility model.

[0023] Wherein: operation cabin - 1, addition cabin - 2, discharge pipe - 3, precipitation cabin - 4, filtration mechanism - 5, transition pipe - 41, discharge pipe - 42, through pipe - 51, feed pipe - 52, expansion base - 53, opening - 511, cabin door - 512, flange - 513, driven gear - 514, fixing bracket - 515, connecting shaft - 516, filter disc - 517, bracket - 5141, limiting ring - 5142, motor - 531, gear - 532. Specific embodiments

[0024] In order to further explain the technical solution of the present utility model, the following will be elaborated in detail through specific embodiments.

[0025] Please refer to Figure 1 , the present utility model provides a wet-process phosphoric acid impurity removal device, including an operation cabin 1 that can perform impurity removal operations. The top surface of the operation cabin 1 is connected with no less than two groups of addition cabins 2, which is convenient for adding reactants into the operation cabin 1 to improve the impurity removal effect. The right bottom end of the operation cabin 1 is connected with a group of discharge pipes 3 that can discharge wet-process phosphoric acid. It also includes a precipitation cabin 4 arranged at the left top end of the operation cabin 1, and the top end of the precipitation cabin 4 is connected with a filtration mechanism 5.

[0026] Please refer to Figure 1-2 , the present utility model provides a wet-process phosphoric acid impurity removal device. The filtration mechanism 5 includes a through pipe 51, a feed pipe 52 and an expansion base 53. The bottom end of the through pipe 51 is communicated with the top end of the precipitation cabin 4, the top end is connected with the feed pipe 52, and the right end of the through pipe 51 is connected with the expansion base 53. The right bottom end of the precipitation cabin 4 is connected with the left top end of the operation cabin 1 through a group of transition pipes 41, which can move the wet-process phosphoric acid after precipitation into the operation cabin 1. The bottom surface of the precipitation cabin 4 is connected with a group of discharge pipes 42 that can discharge waste.

[0027] Please refer to Figure 2-6, the present utility model provides a wet-process phosphoric acid impurity removal device. A group of openings 511 are provided at the left end of the through pipe 51. A group of hatch doors 512 are hinged at the rear end of the openings 511. A sealing rubber strip is provided at the contact position between the hatch doors 512 and the openings 511, which can improve the sealing performance. At the position near the top of the opening 511 inside the through pipe 51, two groups of flanges 513 are provided. Between the two groups of flanges 513, a group of driven gears 514 are provided. Among them, the middle of the driven gear 514 is hollowed out and provided with a group of bracket 5141 in the shape of a large Chinese character. The middle end of the bracket 5141 is connected with a group of inverted "C" shaped limit rings 5142. And a convex block is provided at the right end inside the limit ring 5142. At the position near the bottom of the opening 511 inside the through pipe 51, a group of fixing frames 515 are provided. Between the driven gear 514 and the fixing frame 515, a group of connecting shafts 516 are provided. A number of filter disks 517 for filtering wet-process phosphoric acid are equidistantly provided on the outer side of the connecting shaft 516. The connecting shaft 516 can be inserted into the limit ring 5142 through the right end of the bracket 5141, and a cover plate is provided at its top, which can be clamped at the top of the limit ring 5142. A groove corresponding to the convex block is provided at the right top end of the connecting shaft 516, which can improve the connection stability. And when the driven gear 514 rotates, it can drive the filter disk 517 to rotate, improving the filtering effect. The bottom end of the connecting shaft 516 can be placed at the middle top end of the fixing frame 515 to improve the stability. Further, a sealing ring is provided on the outer side of the filter disk 517, which can contact the inner sides of the through pipe 51 and the hatch door 512, improving the sealing effect.

[0028] Please refer to Figure 3-4 , the present utility model provides a wet-process phosphoric acid impurity removal device. At the top end inside the expansion base 53, a group of motors 531 are provided. The top end of the driving shaft of the motor 531 is connected with a group of gears 532. The left end of the gear 532 penetrates and extends to the inside of the through pipe 51 and meshes with the right end of the driven gear 514. The rotation of the driving shaft of the motor 531 can drive the driven gear 514 and the filter disk 517 to rotate through the gear 532.

[0029] The working principle is as follows:

[0030] During use, the wet-process phosphoric acid can be discharged into the through pipe 51 through the feed pipe 52. The wet-process phosphoric acid can fall on the filter disk 517 through the bracket 5141 for filtering. At this time, the motor 531 can be started. The rotation of the driving shaft of the motor 531 can drive the driven gear 514 and the filter disk 517 to rotate through the gear 532, improving the filtering effect on the wet-process phosphoric acid. After the wet-process phosphoric acid is filtered by a number of filter disks 517, it falls into the precipitation chamber 4 for precipitation. After the precipitation is completed, it can be discharged into the operation chamber 1 through the transition pipe 41 for the final impurity removal operation;

[0031] When the filtering mechanism 5 needs to be cleaned, the hatch 512 can be opened, and the driven gear 514 is rotated by the motor 531 so that the opening position of the limiting ring 5142 faces the opening 511. Then, a force is applied to the connecting shaft 516 to pull it out of the limiting ring 5142 and take it out through the opening 511, facilitating the cleaning and maintenance of the filter disc 517 thereon. Then, the inside of the through pipe 51 can be cleaned through the opening 511.

[0032] The above are only the preferred examples of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A wet-process phosphoric acid impurity removal device, comprising an operation chamber (1) capable of performing impurity removal operations, the top surface of the operation chamber (1) being connected to at least two groups of addition chambers (2), and the right bottom end of the operation chamber (1) being connected to a group of discharge pipes (3) capable of discharging wet-process phosphoric acid; Features: It also comprises a sedimentation chamber (4) arranged at the top end of the left side of the operation chamber (1), and the top end of the sedimentation chamber (4) is connected to a filtering mechanism (5); The filtering mechanism (5) comprises a through pipe (51), a feed pipe (52) and an expansion seat (53); the bottom end of the through pipe (51) is connected to the top end of the sedimentation chamber (4); the top end is connected to the feed pipe (52); and the right end of the through pipe (51) is connected to the expansion seat (53).

2. A wet-process phosphoric acid impurity removal device according to claim 1, characterized in that: The right bottom end of the sedimentation chamber (4) is connected to the left top end of the working chamber (1) via a group of transition pipes (41), and the bottom surface of the sedimentation chamber (4) is connected to a group of discharge pipes (42).

3. A wet process phosphoric acid impurity removal device according to claim 1, characterized in that: A group of openings (511) are provided at the left end of the through pipe (51), a group of hatches (512) are hingedly connected to the rear end of the opening (511), two groups of flanges (513) are provided in the through pipe (51) near the top end of the opening (511), a group of driven gears (514) are provided between the two groups of flanges (513), and a group of fixing frames (515) are provided in the through pipe (51) near the bottom end of the opening (511), a group of connecting shafts (516) are provided between the driven gears (514) and the fixing frames (515), and a plurality of groups of filter discs (517) are provided at equal intervals outside the connecting shafts (516).

4. A wet-process phosphoric acid impurity removal device according to claim 3, characterized in that: The middle part of the driven gear (514) is hollowed out and provided with a set of brackets (5141), and the middle end of the bracket (5141) is provided with a set of limiting rings (5142).

5. A wet process phosphoric acid impurity removal device according to claim 3, characterized in that: A group of motors (531) are provided at the top of the expansion seat (53), and a group of gears (532) are connected to the top of the driving shaft of the motor (531). The left end of the gear (532) extends through the through pipe (51) and meshes with the right end of the driven gear (514).

6. A wet-process phosphoric acid impurity removal device according to claim 4, characterized in that: The bracket (5141) is in a U-shaped shape, the limiting ring (5142) is in an inverted "C" shape, and a protrusion is provided at the right end inside the limiting ring (5142).

7. A wet process phosphoric acid impurity removal device according to claim 6, characterized in that: The top end of the connecting shaft (516) is provided with a cover plate which can be clamped on the top end of the limiting ring (5142), and the right top end of the connecting shaft (516) is provided with a groove corresponding to the protrusion.

8. The wet process phosphoric acid impurity removal device according to claim 3, characterized in that: A sealing ring is provided on the outside of the filter disc (517) and can contact the inner side of the through pipe (51) and the hatch (512); a sealing strip is provided at the contact position between the hatch (512) and the opening (511).

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