Device and equipment for efficiently removing and purifying hydrogen sulfide in phosphoric acid

Abstract

The utility model provides a device and equipment for efficiently removing and purifying hydrogen sulfide in phosphoric acid. The device for efficiently removing and purifying hydrogen sulfide in phosphoric acid comprises an aeration tower, a supergravity hydrogen sulfide remover, a fixed seat, a bubble generator and a material conveying assembly, a top cover is arranged at the top end of the aeration tower, the bubble generator is arranged on the top cover, and the bubble generator is provided with a compressed gas inlet pipe; the material conveying assembly comprises a feeding pipe, a material guiding pipe and a material conveying pipe, the two ends of the bubble generator are communicated with the feeding pipe and the material guiding pipe respectively, the end, away from the bubble generator, of the material guiding pipe is located in the aeration tower, one end of the material conveying pipe is located in the aeration tower, and the other end of the material conveying pipe sequentially penetrates through the aeration tower and the supergravity hydrogen sulfide remover. The bubble generator is used for generating a bubble group with small particle size, the contact area of air and phosphoric acid is increased, H2S in phosphoric acid can be transferred into bubbles, high mass transfer efficiency of H2S is ensured, the phosphoric acid treated by the bubble generator is aerated, and the removal efficiency and removal effect of H2S are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of phosphoric acid production, and in particular to a device and equipment for efficiently removing and purifying hydrogen sulfide in phosphoric acid. Background Art

[0002] Nowadays, in order to produce food-grade or electronic-grade industrial phosphoric acid, it is necessary to remove arsenic from it. The arsenic in industrial phosphoric acid prepared by wet process is derived from phosphate rock, and the arsenic content in industrial phosphoric acid depends on the arsenic content in the phosphate rock, which is usually 30-100 mg / kg. Arsenic exists in phosphoric acid in the form of H3AsO3. In order to remove arsenic from phosphoric acid, a dearsenicating agent is generally used to react with H3AsO3 to generate As2S3 that is insoluble in water or phosphoric acid. The dearsenicating agent is generally Na2S or P2S5. Na2S or P2S5 reacts with phosphoric acid to generate H2S, which then reacts with H3AsO3 in phosphoric acid to convert H3AsO3 into As2S3 precipitation. Since the solubility of H2S in phosphoric acid is low, in order to completely remove the arsenic from phosphoric acid, an excess of H2S must be used. H2S is a Class A fire hazard gas that is highly toxic, flammable and explosive, and is a hazardous chemical under key supervision. Therefore, after the arsenic removal treatment of phosphoric acid, the residual H2S in the phosphoric acid needs to be completely removed to prevent the phosphoric acid from bringing H2S into downstream units and precipitating it, causing safety or environmental accidents.

[0003] To this end, Chinese patent CN101597040B proposes a method and product for producing food-grade phosphoric acid using refined wet-process phosphoric acid, wherein active silicon dioxide is added as a defluorinating agent, sodium sulfide solution or phosphorus pentasulfide solid is added as a dearsenicizing and deleading agent, and after filtering, the filtrate is sent to an aeration section, air is continuously blown in and stirred, and finally filtered to obtain food-grade phosphoric acid. This method is low in cost, low in energy consumption, and pollution-free, but its aeration time is long, the mass transfer efficiency is low, and the removal effect of H2S is poor.

[0004] Furthermore, the Chinese patent with patent number CN110482506A proposes a device and method for process-enhanced removal of hydrogen sulfide from industrial phosphoric acid, which removes hydrogen sulfide from phosphoric acid in two stages through a primary aeration tower and a supergravity hydrogen sulfide remover, thereby removing hydrogen sulfide gas from phosphoric acid to a lower concentration. However, it adopts a traditional aeration method, resulting in low mass transfer efficiency, and the primary aeration tower and the supergravity hydrogen sulfide remover are separately arranged, which increases the floor space. Utility Model Content

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a device and equipment for efficiently removing and purifying hydrogen sulfide in phosphoric acid by improving the mass transfer efficiency of H2S to improve the removal efficiency and removal effect of H2S and reducing the occupied space.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A device for efficiently removing and purifying hydrogen sulfide in phosphoric acid comprises an aeration tower, an ultra-gravity hydrogen sulfide remover, a fixing seat, a bubble generator and a feeding assembly, wherein two ends of the ultra-gravity hydrogen sulfide remover are respectively connected to the aeration tower and the fixing seat, and a top cover is provided on the top of the aeration tower; the bubble generator is arranged on the top cover, and the bubble generator is provided with a compressed gas inlet pipe, and the compressed gas inlet pipe is used to connect to an air compressor; the feeding assembly comprises a feed pipe, a guide pipe and a feeding pipe, wherein two ends of the bubble generator are respectively connected to the feed pipe and the guide pipe, the compressed gas inlet pipe is arranged adjacent to the feed pipe, one end of the guide pipe away from the bubble generator is passed through the top cover and is located in the aeration tower, one end of the feeding pipe is located in the aeration tower, and the other end of the feeding pipe is passed through the aeration tower and the ultra-gravity hydrogen sulfide remover in sequence.

[0008] In one embodiment, the bubble generator includes a contraction pipe section, a throat pipe section and a diffusion pipe section which are connected in sequence, the contraction pipe section is also connected to the feed pipe, the contraction pipe section is provided with the compressed gas inlet pipe, and the diffusion pipe section is also connected to the guide pipe.

[0009] In one embodiment, the bubble generator includes a first venturi tube and a second venturi tube, the contraction section of the first venturi tube is connected to the feed pipe, the diffusion section of the first venturi tube is connected to the contraction section of the second venturi tube, and the diffusion section of the second venturi tube is connected to the material guide pipe.

[0010] In one embodiment, a feed port is provided at one end of the feed pipe, and a plurality of discharge ports are formed at the other end of the feed pipe. There are multiple bubble generators and multiple guide pipes. The multiple discharge ports are connected to the multiple bubble generators in a one-to-one correspondence, and the multiple bubble generators are connected to the multiple guide pipes in a one-to-one correspondence. Both ends of each bubble generator are respectively connected to the corresponding discharge port and the corresponding guide pipe, and each bubble generator is provided with the compressed gas inlet pipe.

[0011] In one embodiment, the aeration tower is provided with a first exhaust port, the first exhaust port is arranged adjacent to the top of the aeration tower, and / or;

[0012] The device for efficiently removing and purifying hydrogen sulfide in phosphoric acid also includes a fixed bracket, which is connected to the top cover, and one end of the fixed bracket away from the top cover is connected to the bottom of the bubble generator.

[0013] In one embodiment, the feed pipe is a liquid distributor, and the ultra-gravity hydrogen sulfide remover includes an installation bin and a rotating packed bed. The two ends of the installation bin are respectively connected to the fixed seat and the aeration tower. The installation bin forms a movable cavity, and the rotating packed bed is rotatably arranged in the movable cavity. The end of the feed pipe away from the aeration tower is located in the movable cavity, and the rotating packed bed is arranged around the feed pipe.

[0014] In one embodiment, the ultra-gravity hydrogen sulfide remover also includes a motor and a rotating shaft, the fixed seat forms a accommodating cavity, the motor is located in the accommodating cavity, and the motor is arranged at the bottom of the installation bin; the power output end of the motor is passed through the installation bin and connected to the rotating shaft, and the end of the rotating shaft away from the motor is connected to the rotating packing bed.

[0015] In one of the embodiments, a discharge pipe is provided at the bottom of the installation bin, one end of the discharge pipe is connected to the movable cavity, and the other end of the discharge pipe is passed through a side wall of the accommodating cavity and is used to communicate with the feed end of the material recovery unit.

[0016] In one embodiment, an air intake pipe is provided at the bottom of the installation bin, one end of the air intake pipe is connected to the active cavity, the other end of the air intake pipe is passed through the other side wall of the accommodating cavity and is used to connect with the air outlet end of the air compressor, and a second exhaust port is provided on the side wall of the active cavity, and the second exhaust port is arranged adjacent to the top of the installation bin.

[0017] A device for efficiently removing and purifying hydrogen sulfide in phosphoric acid comprises a machine and a device for efficiently removing and purifying hydrogen sulfide in phosphoric acid as described in any of the above embodiments, wherein the fixing seat is connected to the machine.

[0018] Compared with the prior art, the present invention has the following advantages, including but not limited to:

[0019] 1. When the dearsenicated phosphoric acid enters the bubble generator through the feed pipe, the compressed gas generated by the air compressor enters the bubble generator through the compressed gas inlet pipe. The dearsenicated phosphoric acid and the compressed air are initially dispersed and mixed at the inlet of the bubble generator. The mixed gas-liquid two-phase is sheared and broken in the bubble generator to form a bubble group; the phosphoric acid treated by the bubble generator enters the aeration tower through the guide pipe for aeration to complete the primary removal of phosphoric acid. The aerated phosphoric acid is transported to the ultra-gravity hydrogen sulfide remover through the feed pipe for secondary removal of phosphoric acid, thereby improving the removal efficiency and effect of H2S;

[0020] 2. The ultra-gravity hydrogen sulfide remover and the aeration tower are integrated into the device for efficiently removing and purifying hydrogen sulfide in phosphoric acid, which reduces the occupied space. The device for efficiently removing and purifying hydrogen sulfide in phosphoric acid disclosed in the present invention has a simple structure and is easy to install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic structural diagram of a device for efficiently removing and purifying hydrogen sulfide from phosphoric acid in one embodiment;

[0023] Figure 2 for Figure 1 An enlarged view of the device for efficiently removing and purifying hydrogen sulfide in phosphoric acid at position a is shown;

[0024] Figure 3 for Figure 1 A top view of a device for efficiently removing and purifying hydrogen sulfide from phosphoric acid;

[0025] Description of reference numerals:

[0026] The invention discloses an apparatus 10 for efficiently removing and purifying hydrogen sulfide from phosphoric acid, comprising an aeration tower 100, a first exhaust port 101, and a top cover 110; an ultra-gravity hydrogen sulfide remover 200, a mounting bin 210, a movable chamber 2101, a second exhaust port 2102, a rotating packed bed 220, a motor 230, a rotating shaft 240, a discharge pipe 250, and an air intake pipe 260; a fixing seat 300, and a containing chamber 301; a bubble generator 400, a compressed gas intake pipe 401, a first venturi tube 400a, a second venturi tube 400b, a contraction pipe section 410, a throat pipe section 420, and a diffusion pipe section 430; a material conveying assembly 500, a feed pipe 510, a feed port 5101, a discharge port 5102, a material guide pipe 520, and a feed pipe 530; and a fixing bracket 600. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0031] See also Figures 1 to 3 , which is an apparatus 10 for efficiently removing and purifying hydrogen sulfide in phosphoric acid according to an embodiment of the present disclosure, comprising an aeration tower 100, an ultra-gravity hydrogen sulfide remover 200, a fixing seat 300, a bubble generator 400 and a feeding assembly 500, wherein both ends of the ultra-gravity hydrogen sulfide remover 200 are respectively connected to the aeration tower 100 and the fixing seat 300, and a top cover 110 is provided at the top of the aeration tower 100; the bubble generator 400 is provided on the top cover 110, and the bubble generator 400 is provided with a compressed gas inlet pipe 401, and the compressed gas inlet pipe 401 is used to connect to an air compressor (not shown) The material conveying assembly 500 includes a feed pipe 510, a guide pipe 520 and a feeding pipe 530. The two ends of the bubble generator 400 are respectively connected to the feed pipe 510 and the guide pipe 520. The compressed gas inlet pipe 401 is arranged adjacent to the feed pipe 510. One end of the guide pipe 520 away from the bubble generator 400 is penetrated through the top cover 110 and located in the aeration tower 100. One end of the feeding pipe 530 is located in the aeration tower 100, and the other end of the feeding pipe 530 is sequentially penetrated through the aeration tower 100 and the ultra-gravity hydrogen sulfide remover 200.

[0032] In this embodiment, the fixing seat 300 is used to be installed on the machine platform to fix the entire device 10 for efficiently removing and purifying hydrogen sulfide in phosphoric acid on the machine platform. A top cover 110 is provided on the top of the aeration tower 100, and a bubble generator 400 is arranged on the top cover 110; wherein, the two ends of the bubble generator 400 are respectively connected with the feed pipe 510 and the guide pipe 520, and the end of the guide pipe 520 away from the bubble generator 400 is penetrated through the top cover 110 and is located in the aeration tower 100, and the bubble generator 400 is provided with a compressed gas inlet pipe 401. It can be understood that when the dearsenicated phosphoric acid is fed into the aeration tower 100 through the feed pipe 510, the compressed gas inlet pipe 401 is provided. When entering the bubble generator 400, the compressed gas generated by the air compressor enters the bubble generator 400 through the compressed gas inlet pipe 401, and the dearsenicized phosphoric acid and the compressed air are preliminarily dispersed and mixed at the entrance of the bubble generator 400. The mixed gas-liquid two-phase is sheared and broken in the bubble generator 400 to generate a bubble group; the phosphoric acid treated by the bubble generator 400 enters the aeration tower 100 through the guide pipe 520 for aeration, completing the primary removal of phosphoric acid, and the aerated phosphoric acid is transported to the ultra-gravity hydrogen sulfide remover 200 through the feeding pipe 530 for secondary removal of phosphoric acid.

[0033] In the present embodiment, a bubble group with a smaller particle size is generated by the bubble generator 400, which increases the contact area between air and phosphoric acid, is beneficial to the transfer of H2S in the phosphoric acid into the bubbles, and ensures that the mass transfer efficiency of H2S is high. The phosphoric acid treated by the bubble generator 400 is then introduced into the aeration tower 100 through the material guide pipe 520 for aeration, thereby improving the removal efficiency and removal effect of H2S. The ultra-gravity hydrogen sulfide remover 200 and the aeration tower 100 are integrally arranged in the device 10 for efficiently removing and purifying hydrogen sulfide in phosphoric acid, thereby reducing the occupied space. The device 10 for efficiently removing and purifying hydrogen sulfide in phosphoric acid disclosed in the present invention has a simple structure and is easy to install and maintain.

[0034] In one embodiment, see Figure 3The bubble generator 400 includes a contraction pipe section 410, a throat pipe section 420 and a diffusion pipe section 430 which are connected in sequence. The contraction pipe section 410 is also connected to the feed pipe 510. The contraction pipe section 410 is provided with the compressed gas inlet pipe 401. The diffusion pipe section 430 is also connected to the guide pipe 520. In this embodiment, the bubble generator 400 includes a contraction section 410, a throat section 420 and a diffusion section 430 which are connected in sequence. It can be seen that the bubble generator 400 is a venturi tube. After the dearsenicated phosphoric acid and the compressed air enter the bubble generator 400, the dearsenicated phosphoric acid and the compressed air are initially mixed with gas and liquid at the entrance of the contraction section 410. The mixed gas-liquid two-phase is successively broken by strong turbulent hydraulic shear at the contraction section 410, the throat section 420 and the diffusion section 430 of the bubble generator 400 to generate a bubble group, so as to increase the contact area between air and phosphoric acid, which is beneficial to the transfer of H2S in the phosphoric acid to the bubbles, thereby ensuring a high mass transfer efficiency of H2S.

[0035] In one embodiment, see Figure 3 The bubble generator 400 includes a first venturi tube 400a and a second venturi tube 400b, wherein the contraction tube section 410 of the first venturi tube 400a is connected to the feed tube 510, the diffusion tube section 430 of the first venturi tube 400a is connected to the contraction tube section 410 of the second venturi tube 400b, and the diffusion tube section 430 of the second venturi tube 400b is connected to the guide tube 520. The bubble generator 400 includes the first venturi tube 400a and the second venturi tube 400b, and after the dearsenicated phosphoric acid and the compressed air are dispersed and mixed by gas and liquid, a bubble group is generated through the first venturi tube 400a, and the bubble group is further broken up through the second venturi tube 400b to generate a bubble group with a higher proportion of fine bubbles, thereby further improving the mass transfer efficiency of H2S.

[0036] In one embodiment, see Figure 2 and Figure 3 , a feed port 5101 is provided at one end of the feed pipe 510, and a plurality of discharge ports 5102 are formed at the other end of the feed pipe 510, the number of the bubble generators 400 and the guide pipes 520 are both multiple, the multiple discharge ports 5102 are connected to the multiple bubble generators 400 in a one-to-one correspondence, and the multiple bubble generators 400 are connected to the multiple guide pipes 520 in a one-to-one correspondence, and the two ends of each bubble generator 400 are respectively connected to the corresponding discharge port 5102 and the corresponding guide pipe 520, and each bubble generator 400 is provided with the compressed gas inlet pipe 401. In this way, by setting up multiple bubble generators 400, more bubble groups are generated, further increasing the contact area between air and phosphoric acid, ensuring that the mass transfer efficiency of H2S is high, so as to improve the removal efficiency and removal effect of H2S.

[0037] In one embodiment, see Figure 2 The aeration tower 100 is provided with a first exhaust port 101, and the first exhaust port 101 is arranged near the top of the aeration tower 100. It can be understood that the phosphoric acid treated by the bubble generator 400 enters the aeration tower 100 for aeration, and the H2S-containing air precipitated by aeration is discharged to the tail gas treatment unit through the first exhaust port 101.

[0038] In one embodiment, see Figure 2 The device 10 for efficiently removing and purifying hydrogen sulfide from phosphoric acid further comprises a fixing bracket 600, which is connected to the top cover 110, and one end of the fixing bracket 600 away from the top cover 110 is connected to the bottom of the bubble generator 400. In this embodiment, the fixing bracket 600 is provided to install and fix the bubble generator 400.

[0039] In one embodiment, see Figure 1 , the feed pipe 530 is a liquid distributor, the super gravity hydrogen sulfide remover 200 includes an installation bin 210 and a rotating packed bed 220, the two ends of the installation bin 210 are respectively connected to the fixed seat 300 and the aeration tower 100, the installation bin 210 forms an active cavity 2101, the rotating packed bed 220 is rotatably arranged in the active cavity 2101, the end of the feed pipe 530 away from the aeration tower 100 is located in the active cavity 2101, and the rotating packed bed 220 is arranged around the feed pipe 530. In this embodiment, the feed pipe 530 is a liquid distributor, and the aerated phosphoric acid enters the active cavity 2101 of the installation bin 210 through the liquid distributor, wherein the phosphoric acid is dispersed by the liquid distributor, captured and divided by the high-speed rotating rotating packed bed 220, and the H2S in the phosphoric acid is removed for a second time under the action of super gravity.

[0040] In one embodiment, see Figure 1, the ultra-gravity hydrogen sulfide remover 200 also includes a motor 230 and a rotating shaft 240, the fixed seat 300 is formed with a receiving chamber 301, the motor 230 is located in the receiving chamber 301, and the motor 230 is arranged at the bottom of the installation chamber 210; the power output end of the motor 230 is arranged in the installation chamber 210 and connected to the rotating shaft 240, and the end of the rotating shaft 240 away from the motor 230 is connected to the rotating packing bed 220. In this embodiment, the fixed seat 300 is formed with a receiving chamber 301, the motor 230 is arranged in the receiving chamber 301, the power output end of the motor 230 is arranged in the installation chamber 210 and connected to the rotating shaft 240, and the end of the rotating shaft 240 away from the motor 230 is connected to the rotating packing bed 220, and the rotating packing bed 220 is driven to rotate at a high speed through the rotation of the rotating shaft 240 to perform secondary removal of H2S in phosphoric acid.

[0041] In one embodiment, see Figure 1 The bottom of the installation bin 210 is provided with a discharge pipe 250, one end of which is connected to the active chamber 2101, and the other end of which is passed through a side wall of the accommodating chamber 301 and is used to be connected to the feed end of the material recovery unit (not shown). In this way, by providing the discharge pipe 250, the phosphoric acid after passing through the supergravity hydrogen sulfide remover 200 is transported to the material recovery unit through the discharge pipe 250.

[0042] In one embodiment, see Figure 1 An air intake pipe 260 is provided at the bottom of the installation bin 210, one end of the air intake pipe 260 is connected to the active cavity 2101, and the other end of the air intake pipe 260 is passed through the other side wall of the accommodating cavity 301 and is used to be connected to the air outlet end of the air compressor (not shown in the figure), and a second exhaust port 2102 is provided on the side wall of the active cavity 2101, and the second exhaust port 2102 is arranged adjacent to the top of the installation bin 210. In this embodiment, phosphoric acid is thrown to the inner wall of the active chamber 2101 under the action of supergravity, and flows down along the inner wall of the active chamber 2101 in the form of droplets, wherein the air outlet end of the air compressor conveys air to the air inlet pipe 260 through the air inlet pipe 260, and the phosphoric acid droplets and the air sent into the active chamber 2101 by the air inlet pipe 260 are cross-transferred to further remove trace amounts of H2S in the phosphoric acid, and the air containing H2S after the mass transfer is discharged to the exhaust gas treatment unit through the second exhaust port 2102, thereby improving the H2S removal effect.

[0043] The present disclosure also provides a device for efficiently removing and purifying hydrogen sulfide in phosphoric acid, including a machine and the device 10 for efficiently removing and purifying hydrogen sulfide in phosphoric acid as described in any of the above embodiments, wherein the fixing seat 300 is connected to the machine.

[0044] In this embodiment, when the dearsenicated phosphoric acid enters the bubble generator 400 through the feed pipe 510, the compressed gas generated by the air compressor enters the bubble generator 400 through the compressed gas inlet pipe 401, and the dearsenicated phosphoric acid and the compressed air are preliminarily dispersed and mixed at the inlet of the bubble generator 400. The mixed gas-liquid two-phase is sheared and broken by strong turbulent hydraulic force at the contraction pipe section 410, the throat section 420 and the diffusion pipe section 430 of the bubble generator 400 to generate a bubble group; the phosphoric acid treated by the bubble generator 400 enters the aeration tower 100 through the guide pipe 520 for aeration, completing the primary removal of phosphoric acid, wherein the H2S-containing air precipitated by aeration is discharged to the tail gas treatment unit through the first exhaust port 101 for treatment, and the aerated phosphoric acid is transported to the active chamber 2101 of the ultra-gravity hydrogen sulfide remover 200 through the feed pipe 530. Since the feed pipe 530 is a liquid distributor, the aerated phosphoric acid enters the active chamber 2101 of the installation bin 210 through the liquid distributor, and the phosphoric acid is evenly dispersed by the liquid distributor and captured and divided by the high-speed rotating rotating packed bed 220. The phosphoric acid is thrown to the inner wall of the active chamber 2101 under the action of supergravity, and flows down along the inner wall of the active chamber 2101 in the form of droplets. At this time, the air outlet of the air compressor conveys air to the active chamber 2101 through the air inlet pipe 260, and the phosphoric acid droplets and the air carry out cross-flow mass transfer to further remove the trace amount of H2S in the phosphoric acid. After the mass transfer, the air containing H2S is discharged to the tail gas treatment unit through the second exhaust port 2102 for treatment. At the same time, the phosphoric acid after passing through the supergravity hydrogen sulfide remover 200 is conveyed to the material recovery unit through the discharge pipe 250, thereby realizing the secondary removal of phosphoric acid.

[0045] Compared with the prior art, the present invention has the following advantages, including but not limited to:

[0046] 1. When the dearsenicated phosphoric acid enters the bubble generator 400 through the feed pipe 510, the compressed gas generated by the air compressor enters the bubble generator 400 through the compressed gas inlet pipe 401, and the dearsenicated phosphoric acid and the compressed air are preliminarily dispersed and mixed at the inlet of the bubble generator 400. The mixed gas-liquid two-phase is sheared and broken in the bubble generator 400 to generate a bubble group; the phosphoric acid treated by the bubble generator 400 enters the aeration tower 100 through the guide pipe 520 for aeration, completing the primary removal of phosphoric acid, and the aerated phosphoric acid is transported to the ultra-gravity hydrogen sulfide remover 200 through the feed pipe 530 for secondary removal of phosphoric acid, thereby improving the removal efficiency and removal effect of H2S;

[0047] 2. The ultra-gravity hydrogen sulfide remover 200 and the aeration tower 100 are integrally arranged in the device 10 for efficiently removing and purifying hydrogen sulfide in phosphoric acid, thereby reducing the occupied space. The device 10 for efficiently removing and purifying hydrogen sulfide in phosphoric acid disclosed in the present invention has a simple structure and is easy to install and maintain.

[0048] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A device for efficiently removing and purifying hydrogen sulfide in phosphoric acid, characterized in that: The device comprises an aeration tower (100) and a supergravity hydrogen sulfide remover (200), and the device for efficiently removing and purifying hydrogen sulfide in phosphoric acid also comprises: A fixing seat (300), wherein both ends of the supergravity hydrogen sulfide remover (200) are respectively connected to the aeration tower (100) and the fixing seat (300), and a top cover (110) is provided at the top of the aeration tower (100); A bubble generator (400) is arranged on the top cover (110), and the bubble generator (400) is provided with a compressed gas inlet pipe (401), and the compressed gas inlet pipe (401) is used to connect to an air compressor; The material conveying assembly (500) comprises a feed pipe (510), a guide pipe (520) and a feeding pipe (530); the two ends of the bubble generator (400) are respectively connected to the feed pipe (510) and the guide pipe (520); the compressed gas inlet pipe (401) is arranged adjacent to the feed pipe (510); one end of the guide pipe (520) away from the bubble generator (400) is passed through the top cover (110) and is located in the aeration tower (100); one end of the feeding pipe (530) is located in the aeration tower (100); and the other end of the feeding pipe (530) is passed through the aeration tower (100) and the ultra-gravity hydrogen sulfide remover (200) in sequence.

2. The device for efficiently removing and purifying hydrogen sulfide in phosphoric acid according to claim 1, characterized in that: The bubble generator (400) comprises a contraction pipe section (410), a throat pipe section (420) and a diffusion pipe section (430) which are connected in sequence; the contraction pipe section (410) is also connected to the feed pipe (510); the contraction pipe section (410) is provided with the compressed gas inlet pipe (401); and the diffusion pipe section (430) is also connected to the guide pipe (520).

3. The device for efficiently removing and purifying hydrogen sulfide in phosphoric acid according to claim 2, characterized in that: The bubble generator (400) comprises a first venturi tube (400a) and a second venturi tube (400b); the contraction tube section (410) of the first venturi tube (400a) is connected to the feed tube (510); the diffusion tube section (430) of the first venturi tube (400a) is connected to the contraction tube section (410) of the second venturi tube (400b); and the diffusion tube section (430) of the second venturi tube (400b) is connected to the guide tube (520).

4. The device for efficiently removing and purifying hydrogen sulfide in phosphoric acid according to claim 1, characterized in that: One end of the feed pipe (510) is provided with a feed port (5101), and the other end of the feed pipe (510) is formed with a plurality of discharge ports (5102). The number of the bubble generators (400) and the guide pipes (520) are both plural, and the plurality of discharge ports (5102) are connected to the plurality of bubble generators (400) in a one-to-one correspondence, and the plurality of bubble generators (400) are connected to the plurality of guide pipes (520) in a one-to-one correspondence. Both ends of each bubble generator (400) are respectively connected to the corresponding discharge port (5102) and the corresponding guide pipe (520), and each bubble generator (400) is provided with the compressed gas inlet pipe (401).

5. The device for efficiently removing and purifying hydrogen sulfide in phosphoric acid according to claim 1, characterized in that: The aeration tower (100) is provided with a first exhaust port (101), the first exhaust port (101) is arranged adjacent to the top of the aeration tower (100), and / or; The device for efficiently removing and purifying hydrogen sulfide in phosphoric acid further comprises a fixed bracket (600), wherein the fixed bracket (600) is connected to the top cover (110), and one end of the fixed bracket (600) away from the top cover (110) is connected to the bottom of the bubble generator (400).

6. The device for efficiently removing and purifying hydrogen sulfide in phosphoric acid according to claim 1, characterized in that: The feed pipe (530) is a liquid distributor. The ultra-gravity hydrogen sulfide remover (200) comprises an installation bin (210) and a rotating packed bed (220). The two ends of the installation bin (210) are respectively connected to the fixing seat (300) and the aeration tower (100). The installation bin (210) is formed with an active cavity (2101). The rotating packed bed (220) is rotatably arranged in the active cavity (2101). One end of the feed pipe (530) away from the aeration tower (100) is located in the active cavity (2101), and the rotating packed bed (220) is arranged around the feed pipe (530).

7. The device for efficiently removing and purifying hydrogen sulfide in phosphoric acid according to claim 6, characterized in that: The ultra-gravity hydrogen sulfide remover (200) further comprises a motor (230) and a rotating shaft (240); the fixing seat (300) is formed with a receiving cavity (301); the motor (230) is located in the receiving cavity (301), and the motor (230) is arranged at the bottom of the installation bin (210); the power output end of the motor (230) is passed through the installation bin (210) and is connected to the rotating shaft (240); and one end of the rotating shaft (240) away from the motor (230) is connected to the rotating packed bed (220).

8. The device for efficiently removing and purifying hydrogen sulfide in phosphoric acid according to claim 7, characterized in that: A discharge pipe (250) is provided at the bottom of the installation bin (210), one end of the discharge pipe (250) is connected to the active cavity (2101), and the other end of the discharge pipe (250) is passed through a side wall of the accommodating cavity (301) and is used to be connected to the feed end of the material recovery unit.

9. The device for efficiently removing and purifying hydrogen sulfide in phosphoric acid according to claim 7, characterized in that: An air intake pipe (260) is provided at the bottom of the installation bin (210), one end of the air intake pipe (260) is in communication with the active cavity (2101), the other end of the air intake pipe (260) is passed through the other side wall of the accommodating cavity (301) and is used to be in communication with the air outlet of the air compressor, and a second exhaust port (2102) is provided on the side wall of the active cavity (2101), and the second exhaust port (2102) is arranged adjacent to the top end of the installation bin (210).

10. An apparatus for efficiently removing and purifying hydrogen sulfide from phosphoric acid, characterized in that: It comprises a machine and a device for efficiently removing and purifying hydrogen sulfide in phosphoric acid as claimed in any one of claims 1 to 9, wherein the fixing seat (300) is connected to the machine.

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