Ammonium sulfate mother liquor treatment equipment and process in hydrocyanic acid preparation

Abstract

The present application relates to the technical field of hydrocyanic acid preparation, and specifically discloses a kind of ammonium sulfate mother liquor treatment equipment and process in hydrocyanic acid preparation, including ammonium sulfate mother liquor treatment tank, with ammonium sulfate mother liquor feeding pipe and ammonium sulfate mother liquor discharge pipe of ammonium sulfate mother liquor treatment tank communication of ammonium sulfate mother liquor treatment tank communication;The inside of the ammonium sulfate mother liquor treatment tank is equipped with spiral pipe assembly with ammonium sulfate mother liquor feeding pipe communication, the inside of the spiral pipe assembly is equipped with a plurality of salt hydrochloride component boards for fixed contact, the free end of the ammonium sulfate mother liquor discharge pipe is connected with filter evaporation box for ammonium sulfate mother liquor evaporation desalination hydrochloric acid, the device solves the problem that traditional ammonium sulfate mother liquor is not pure due to excessive sulfuric acid mixed in, and further causes the problem of impure by-product of ammonium sulfate mother liquor.

Description

Technical Field

[0001] This application relates to the field of hydrogen cyanide preparation technology, and specifically discloses an ammonium sulfate mother liquor treatment device and process in the preparation of hydrogen cyanide. Background Technology

[0002] Hydrogen cyanide is a colorless liquid with the molecular formula HCN, a molecular weight of 27.03, a boiling point of 26°C, a bitter almond odor, and is miscible with water. Hydrogen cyanide is a widely used basic chemical raw material, with downstream products such as adiponitrile, methionine, sodium cyanide, pesticides, and herbicides, and the industry has a large demand for it.

[0003] In the synthesis of hydrogen cyanide, whether it is the Angle process (methane ammoxidation), the BMA process, or the methanol ammoxidation process, the synthesis gas of hydrogen cyanide includes unreacted ammonia and the product hydrogen cyanide that needs to be absorbed.

[0004] The most common ammonia removal process currently involves introducing hydrogen cyanide syngas into the bottom of the ammonia removal tower while simultaneously introducing acid (such as sulfuric acid) into the top. The acid absorbs the ammonia in the hydrogen cyanide syngas. During this process, the hydrogen cyanide syngas flows from bottom to top in the ammonia removal tower, while the acid flows from top to bottom. The acid comes into contact with the hydrogen cyanide syngas and absorbs the ammonia. The hydrogen cyanide syngas, after being absorbed by the acid, is discharged from the top of the ammonia removal tower, while the acid that has absorbed the ammonia is discharged from the bottom of the ammonia removal tower.

[0005] In this process, an excess of sulfuric acid is required. Therefore, it is very important to remove the excess sulfuric acid solution from the ammonium sulfate mother liquor. To this end, an ammonium sulfate mother liquor treatment device and process for the preparation of hydrogen cyanide are proposed. Summary of the Invention

[0006] The purpose of this invention is to solve the problem that the traditional ammonium sulfate mother liquor is impure due to the mixing of excessive sulfuric acid, which in turn leads to impure by-products of the ammonium sulfate mother liquor.

[0007] To achieve the above objectives, the present invention provides the following basic solution:

[0008] An ammonium sulfate mother liquor treatment device for the preparation of hydrogen cyanide includes an ammonium sulfate mother liquor treatment tank, an ammonium sulfate mother liquor inlet pipe connected to the ammonium sulfate mother liquor treatment tank, and an ammonium sulfate mother liquor outlet pipe connected to the ammonium sulfate mother liquor treatment tank.

[0009] The ammonium sulfate mother liquor treatment tank is equipped with a spiral pipe assembly that is connected to the ammonium sulfate mother liquor feed pipe. The spiral pipe assembly is equipped with several hydrochloric acid component plates for fixed contact. The free end of the ammonium sulfate mother liquor discharge pipe is connected to a filter evaporation box for evaporating the ammonium sulfate mother liquor to remove hydrochloric acid.

[0010] The principle and effect of this basic scheme are as follows:

[0011] 1. Compared with existing technologies, this device has a simple structure and ingenious design. This device can obtain very pure ammonium sulfate crystals. Since ammonia needs to be removed, the current ammonium sulfate mother liquor contains excess sulfuric acid. Therefore, this device is equipped with a hydrochloride component plate. The hydrochloride component plate reacts with sulfuric acid to form excess hydrochloric acid and precipitate. Then, taking advantage of the volatility of hydrochloric acid and the fact that water needs to be evaporated for the precipitation of ammonium sulfate crystals, the hydrochloric acid is volatilized. At this time, the ammonium sulfate crystals become very pure, thus solving the problem that the traditional ammonium sulfate mother liquor is impure due to the mixing of excess sulfuric acid, which in turn leads to impure by-products of the ammonium sulfate mother liquor.

[0012] 2. Compared with the prior art, this invention makes an improvement on the hydrochloric acid component plate, which realizes slow liquid flow and adopts a contact reaction. The generated precipitate is directly deposited on the hydrochloric acid component plate, which ensures the full reaction and thus ensures that the remaining sulfuric acid can react completely.

[0013] 3. Compared with existing technologies, due to the presence of sedimentation, the effect of the hydrochloric acid component plate will not drop drastically. Several scraping teeth for scraping the hydrochloric acid reaction balls are uniformly fixed to the inner wall of the mounting tank. The rotating shaft is equipped with hydrochloric acid reaction balls. The rotation of the hydrochloric acid reaction balls can not only accelerate the full contact of the reaction, but also, since the generated precipitate is adsorbed on the hydrochloric acid reaction balls, the rotation of the hydrochloric acid reaction balls in conjunction with the scraping teeth scrapes off the generated precipitate, allowing the precipitate to continue to flow downward with the mother liquor. This ensures that the reaction effect of the hydrochloric acid component plate will not drop drastically and the effect will remain stable in a long-term state.

[0014] 4. Compared with the existing technology, this device is equipped with a filter evaporation box, which uses filtration to separate sediment from liquid. The use of a separate filtration device makes the filter device replaceable.

[0015] 5. Compared with the existing technology, this device is equipped with a filter evaporation box. By utilizing the evaporation effect of the filter evaporation box and the volatility of hydrochloric acid, water is evaporated and lost, and hydrochloric acid evaporates, leaving behind ammonium sulfate mother liquor. As evaporation continues, ammonium sulfate precipitates out, resulting in relatively pure ammonium sulfate crystals.

[0016] Furthermore, the spiral pipe assembly includes a first spiral pipe and a second spiral pipe, which are spliced ​​together. The first spiral pipes are all inclined pipes, and the second spiral pipes are all corner pipes. The hydrochloric acid component plates are all installed in the corner pipes. The uppermost and lowermost ends of the spiral pipe assembly are both first spiral pipes, and the first spiral pipe at the lowermost end is connected to the ammonium sulfate mother liquor discharge pipe.

[0017] Furthermore, the hydrochloric acid component plate includes an annular ring snapped into the inside of the second spiral tube, a recessed plate fixed inside the annular ring, and several mounting grooves on the recessed plate. The recessed plate is recessed along the spiral direction of the spiral pipe assembly. A micro motor is provided on the back side of the recessed plate near the mounting groove. The output shaft of the micro motor is coaxially connected to a rotating shaft. A hydrochloric acid reaction ball is mounted on the rotating shaft. The hydrochloric acid reaction ball is installed in the mounting groove. Several scraping teeth for scraping the hydrochloric acid reaction ball are uniformly fixed to the inner wall of the mounting groove. A gap is left between the hydrochloric acid reaction ball and the mounting groove for the passage of ammonium sulfate mother liquor.

[0018] Furthermore, the hydrochloride reaction ball is barium chloride. The barium chloride reacts with the remaining sulfuric acid in the ammonium sulfate mother liquor to form a precipitate that forms on the hydrochloride reaction ball. The micro motor and the scraping teeth help to keep the gaps clear.

[0019] Furthermore, the filter evaporator includes a box body, an elastic stirring evaporation assembly disposed inside the box body, several overflow ports on the surface of the box body for hydrochloric acid gas evaporation and overflow, and a full-size filter plate that can be detachably connected to the box body.

[0020] Furthermore, the bottom of the box is provided with a ballast tube and a switch valve installed on the ballast tube. The bottom of the box is also provided with several support columns, and the free ends of the support columns are all fixed with rubber anti-slip pads.

[0021] Furthermore, the full-size filter plate includes a main plate, sub-plates symmetrically slidably connected to both sides of the main plate, a sliding groove on the main plate, a sliding rod slidably connected to the sliding groove for adjusting the position of the sub-plates, and an elastic filter screen disposed between the sub-plates. A pull ring is fixed to the outer end of the main plate.

[0022] Furthermore, the elastic stirring evaporation assembly includes an evaporation plate, several electric heating resistance wires built into the evaporation plate, a battery pack electrically connected to the electric heating resistance wires and mounted on the back of the evaporation plate, several spring columns for supporting the evaporation plate, and several flexible ropes fixed to the top of the housing. The flexible ropes are provided with agitating rods around their perimeter.

[0023] This case also discloses a process for treating ammonium sulfate mother liquor in the preparation of hydrogen cyanide, characterized by the following steps:

[0024] S01: The ammonium sulfate mother liquor after ammonia removal is put into the ammonium sulfate mother liquor feed pipe. After passing through the spiral pipe assembly, the speed is reduced and it reacts with the hydrochloric acid on the hydrochloric acid component plate to generate hydrochloric acid solution and sulfate precipitate. The sulfate precipitate stays, and the hydrochloric acid solution and ammonium sulfate mother liquor enter the filter evaporator along the spiral pipe assembly.

[0025] S02: Control the temperature of the filter evaporator between 100° and 120° to achieve water evaporation. Utilize the volatile nature of hydrochloric acid gas to filter out the hydrochloric acid gas. Maintain this temperature until ammonium sulfate crystals precipitate, at which point the heating process ends.

[0026] Furthermore, in step S02, the temperature is precisely controlled to 110°. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This invention provides a schematic diagram of the structure of an ammonium sulfate mother liquor treatment device for the preparation of hydrogen cyanide, as proposed in an embodiment of this application.

[0029] Figure 2 This paper shows a front view of an ammonium sulfate mother liquor treatment device for hydrogen cyanide preparation according to an embodiment of this application;

[0030] Figure 3 This invention provides a schematic diagram of the structure of a full-size filter plate in an ammonium sulfate mother liquor treatment device for hydrogen cyanide preparation, as proposed in an embodiment of this application.

[0031] Figure 4 This paper shows a schematic diagram of the spiral pipeline assembly in an ammonium sulfate mother liquor treatment device for hydrogen cyanide preparation according to an embodiment of this application.

[0032] Figure 5 This illustration shows a schematic diagram of the hydrochloride component plate in an ammonium sulfate mother liquor treatment device for hydrogen cyanide preparation according to an embodiment of this application;

[0033] Figure 6 This paper shows a schematic diagram of the internal structure of the filter evaporator in an ammonium sulfate mother liquor treatment device for the preparation of hydrogen cyanide according to an embodiment of this application. Detailed Implementation

[0034] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0035] The reference numerals in the accompanying drawings include: 1. Ammonium sulfate mother liquor feed pipe; 2. Ammonium sulfate mother liquor treatment tank; 3. Ammonium sulfate mother liquor discharge pipe; 4. Box body; 401. Overflow port; 402. Mounting hole; 403. Evaporation plate; 404. Spring column; 405. Flexible rope; 406. Agitator; 5. Placement groove; 6. Overflow pipe; 7. Support column; 8. Switch valve; 9. Residual pipe; 10. Temperature sensor; 11. Sub-plate; 12. Main plate; 13. Slide groove; 14. Pull ring; 15. Slide rod; 16. First spiral tube; 17. Second spiral tube; 18. Splicing point; 19. Hydrochloric acid component plate; 1901. Circular ring; 1902. Recessed plate; 1903. Mounting groove; 1904. Hydrochloric acid reaction ball; 1905. Micro motor; 1906. Gap; 1907. Scratching tooth.

[0036] Implementation, for example Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown:

[0037] An ammonium sulfate mother liquor treatment device for the preparation of hydrogen cyanide includes an ammonium sulfate mother liquor treatment tank 2, an ammonium sulfate mother liquor feed pipe 1 connected to the ammonium sulfate mother liquor treatment tank 2, and an ammonium sulfate mother liquor discharge pipe 3 connected to the ammonium sulfate mother liquor treatment tank 2.

[0038] Specifically: As is well known, the preparation of hydrogen cyanide requires the removal of ammonia. Currently, sulfuric acid is added to neutralize the ammonia. However, this results in an excess of sulfuric acid. Since the byproduct is high-quality ammonium sulfate crystals, it is necessary to remove the sulfuric acid from the ammonium sulfate mother liquor to ensure the purity of the ammonium sulfate crystals. Based on this, this invention provides an ammonium sulfate mother liquor treatment device for the preparation of hydrogen cyanide, which can obtain purer ammonium sulfate crystals. The ammonium sulfate mother liquor feed pipe 1 is filled with a mixed ammonium sulfate mother liquor that has already been treated with sulfuric acid.

[0039] The ammonium sulfate mother liquor treatment tank 2 is equipped with a spiral pipe assembly that is connected to the ammonium sulfate mother liquor feed pipe 1. The spiral pipe assembly is equipped with several hydrochloric acid component plates 19 for fixed contact. The free end of the ammonium sulfate mother liquor discharge pipe 3 is connected to a filter evaporation box for evaporating the ammonium sulfate mother liquor to remove hydrochloric acid.

[0040] Specifically: Ammonium sulfate mother liquor enters the spiral pipeline assembly, such as... Figure 4 As shown, the spiral pipe assembly includes a first spiral pipe 16 and a second spiral pipe 17, which are spliced ​​together. Specifically, a splicing point 18 is provided at the connection between the first spiral pipe 16 and the second spiral pipe 17. The splicing point 18 is a snap-fit, and a sealant is provided at the splicing point 18 to ensure the sealing of the connection between the first spiral pipe 16 and the second spiral pipe 17.

[0041] The first spiral tubes 16 are all inclined tubes, and the second spiral tubes 17 are all corner tubes. The hydrochloric acid component plates 19 are all installed in the corner tubes. The purpose is to provide a certain acceleration to the ammonium sulfate mother liquor. Therefore, the first spiral tubes 16 are used to provide acceleration so that it can react better with the hydrochloric acid component plates 19.

[0042] The uppermost and lowermost ends of the spiral pipe assembly are both first spiral pipes 16, and the first spiral pipe 16 at the lowermost end is connected to the ammonium sulfate mother liquor discharge pipe 3.

[0043] Regarding hydrochloric acid component board 19: (as follows) Figure 5 As shown, the hydrochloric acid component plate 19 includes an annular ring 1901 snapped into the inside of the second spiral tube 17, a recessed plate 1902 fixed inside the annular ring 1901, and several mounting grooves 1903 opened on the recessed plate 1902. The recessed plate 1902 is recessed along the spiral direction of the spiral tube assembly. A micro motor 1905 is provided on the back side of the recessed plate 1902 near the mounting groove 1903. The output shaft of the micro motor 1905 is coaxially connected to a rotating shaft. A hydrochloric acid reaction ball 1904 is installed on the rotating shaft. The hydrochloric acid reaction ball 1904 is installed in the mounting groove 1903. Several scraping teeth 1907 for scraping the hydrochloric acid reaction ball 1904 are uniformly fixed to the inner wall of the mounting groove 1903. A gap 1906 is left between the hydrochloric acid reaction ball 1904 and the mounting groove 1903 for the passage of ammonium sulfate mother liquor.

[0044] Specifically: The ammonium sulfate mother liquor passes through the gap 1906. When the ammonium sulfate mother liquor passes through, it comes into contact with the hydrochloride reaction ball 1904. For example, if the hydrochloride reaction ball 1904 is barium chloride, the barium chloride reacts with the remaining sulfuric acid in the ammonium sulfate mother liquor to form a precipitate on the hydrochloride reaction ball 1904. The micro motor 1905 is started, causing the hydrochloride reaction ball 1904 to rotate. Because the precipitate forms on the hydrochloride reaction ball 1904, the thickness of the hydrochloride reaction ball 1904 increases, affecting the continued reaction and the passage of the mother liquor. Therefore, a scraping tooth 1907 is provided. The scraping tooth 1907 scrapes the surface of the hydrochloride reaction ball 1904, exposing new barium chloride reactants, while keeping the gap 1906 unobstructed.

[0045] After passing through the spiral pipe assembly, all the sulfuric acid is reacted off, and the liquid entering the filter evaporator at this time is a mixture of mother liquor and hydrochloric acid solution.

[0046] like Figure 6As shown, the filter evaporator includes a housing 4, an elastic stirring evaporation assembly disposed inside the housing 4, several overflow ports 401 on the surface of the housing 4 for the evaporation and overflow of hydrochloric acid gas, and a full-size filter plate that can be detachably connected to the housing 4. The overflow ports 401 are connected to overflow pipes 6, which are used for the overflow of hydrochloric acid gas. The top of the housing 4 is provided with mounting holes 402, which are used to connect the ammonium sulfate mother liquor discharge pipe 3.

[0047] like Figure 1 As shown, the bottom of the box 4 is provided with a fill tube 9 and a switch valve 8 installed on the fill tube 9. The bottom of the box 4 is also provided with several support columns 7, and the free ends of the support columns 7 are all fixed with rubber anti-slip pads.

[0048] Support column 7 and rubber anti-slip pads provide gravity support for the device and maintain its stability.

[0049] The residual pipe 9 and the switch valve 8 installed on the residual pipe 9 rely on the elastic stirring evaporation component to receive the liquid, so there is a slight leakage phenomenon. Therefore, it is necessary to use the residual pipe 9 and the switch valve 8 installed on the residual pipe 9 to collect the leakage.

[0050] like Figure 3 As shown, the full-size filter plate includes a main plate 12, sub-plates 11 symmetrically slidably connected to both sides of the main plate 12, a groove 13 on the main plate 12, a slide rod 15 slidably connected to the groove 13 for adjusting the position of the sub-plates 11, and an elastic filter screen disposed between the sub-plates 11. A pull ring 14 is fixedly connected to the outer end of the main plate 12.

[0051] Specifically: The surface of the housing 4 has a placement groove 5. The full-size filter plate is placed into the placement groove 5, and then the slide rod 15 is pushed to both sides, so that the auxiliary plate 11 contacts the inner wall of the housing 4. Since the elastic filter has a certain elasticity, the elastic filter is stretched. The auxiliary plate 11 is made of magnetic material, and is magnetically connected to the inner wall of the housing 4, thereby fixing the full-size filter plate. The full-size filter plate can achieve solid-liquid separation, that is, separation of sodium sulfate mother liquor and precipitate, and can be replaced at any time to ensure that there is no precipitation from the previous reaction in the sodium sulfate mother liquor.

[0052] like Figure 6 and Figure 2 As shown, the elastic stirring evaporation assembly includes an evaporation plate 403, several electric heating resistance wires built into the evaporation plate 403, a battery pack electrically connected to the electric heating resistance wires and installed on the back of the evaporation plate 403, several spring columns 404 for supporting the evaporation plate 403, and several flexible ropes 405 fixed to the top of the housing 4. The flexible ropes 405 are provided with agitating rods 406 around their perimeter.

[0053] Specifically: A temperature sensor 10 is installed on the outside of the chamber 4 to ensure a suitable evaporation temperature, ensuring that hydrochloric acid overflows without changing the properties of the sodium sulfate mother liquor;

[0054] In terms of design: Since hydrochloric acid is volatile and the required byproduct is sodium sulfate crystals, evaporation is necessary. Therefore, an evaporation plate 403 and an electric heating resistance wire are set up. When the electric heating resistance wire is activated, as the temperature rises, the water evaporates. Since hydrochloric acid is soluble in water, the water disappears at this time. Also, because hydrochloric acid is volatile, it becomes hydrochloric acid gas and overflows from the overflow pipe 6. Similarly, the water also overflows from the overflow pipe 6. However, the temperature at this time does not change the characteristics of the sodium sulfate mother liquor. As evaporation continues, the sodium sulfate mother liquor becomes sodium sulfate crystals, and the sodium sulfate crystals can be collected.

[0055] In this process, to accelerate the precipitation of sodium sulfate crystals, this invention sets up several spring pillars 404 to support the evaporation plate 403 and several flexible ropes 405 fixed to the top of the box 4. The flexible ropes 405 are surrounded by agitating rods 406. Specifically: since the evaporation plate 403 initially receives water, which has weight, the spring is in a compressed state. As the gas evaporates, the gravity on the spring decreases, and the spring begins to return to its original position, causing the evaporation plate 403 to contact the flexible ropes 405. At this time, the flexible ropes 405 begin to deform due to resistance, causing the agitating rods 406 to contact the upper surface of the evaporation plate 403 and begin to agitate the crystal-liquid mixture located on the upper surface of the evaporation plate 403, accelerating the formation of crystals and realizing the stirring function.

[0056] This case also discloses a process for treating ammonium sulfate mother liquor in the preparation of hydrogen cyanide, including the following steps:

[0057] S01: The ammonium sulfate mother liquor after ammonia removal is put into the ammonium sulfate mother liquor feed pipe 1. After passing through the spiral pipe assembly, the speed is reduced and it reacts with the hydrochloric acid on the hydrochloric acid component plate 19 to generate hydrochloric acid solution and sulfate precipitate. The sulfate precipitate stays, and the hydrochloric acid solution and ammonium sulfate mother liquor enter the filter evaporator along the spiral pipe assembly.

[0058] S02: The temperature of the filter evaporator is controlled between 100°C and 120°C to achieve water evaporation. Taking advantage of the volatile nature of hydrochloric acid gas, it is filtered out. This temperature is maintained until ammonium sulfate crystals precipitate, at which point heating ends. In step S02, the temperature is precisely controlled to 110°C.

[0059] This device solves the problem that the traditional ammonium sulfate mother liquor is impure due to the mixing of excessive sulfuric acid, which in turn leads to impure byproducts of the ammonium sulfate mother liquor.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A device for treating ammonium sulfate mother liquor in the preparation of hydrogen cyanide, characterized in that: It includes an ammonium sulfate mother liquor treatment tank, an ammonium sulfate mother liquor inlet pipe connected to the ammonium sulfate mother liquor treatment tank, and an ammonium sulfate mother liquor outlet pipe connected to the ammonium sulfate mother liquor treatment tank. The ammonium sulfate mother liquor treatment tank is equipped with a spiral pipe assembly that is connected to the ammonium sulfate mother liquor feed pipe. The spiral pipe assembly is equipped with several hydrochloric acid component plates for fixed contact. The free end of the ammonium sulfate mother liquor discharge pipe is connected to a filter evaporation box for evaporating the ammonium sulfate mother liquor to remove hydrochloric acid. The spiral pipe assembly includes a first spiral pipe and a second spiral pipe, which are spliced ​​together. The first spiral pipe is an inclined pipe, and the second spiral pipe is a corner pipe. The hydrochloric acid component plates are installed in the corner pipes. The uppermost and lowermost ends of the spiral pipe assembly are both first spiral pipes. The first spiral pipe at the lowermost end is connected to the ammonium sulfate mother liquor discharge pipe. The hydrochloric acid component plate includes an annular ring snapped into the inside of the second spiral tube, a recessed plate fixed inside the annular ring, and several mounting grooves on the recessed plate. The recessed plate is recessed along the spiral direction of the spiral pipe assembly. A micro motor is provided on the back side of the recessed plate near the mounting groove. The output shaft of the micro motor is coaxially connected to a rotating shaft. A hydrochloric acid reaction ball is mounted on the rotating shaft. The hydrochloric acid reaction ball is installed in the mounting groove. Several scraping teeth for scraping the hydrochloric acid reaction ball are uniformly fixed to the inner wall of the mounting groove. A gap is left between the hydrochloric acid reaction ball and the mounting groove for the passage of ammonium sulfate mother liquor.

2. The ammonium sulfate mother liquor treatment equipment in the preparation of hydrogen cyanide according to claim 1, characterized in that, The hydrochloride reaction ball is made of barium chloride. The barium chloride reacts with the remaining sulfuric acid in the ammonium sulfate mother liquor to form a precipitate that forms on the hydrochloride reaction ball. The gap is kept clear by the action of the micro motor and the scraping teeth.

3. The ammonium sulfate mother liquor treatment equipment in the preparation of hydrogen cyanide according to claim 2, characterized in that, The filter evaporator includes a box body, an elastic stirring evaporation component disposed inside the box body, several overflow ports on the surface of the box body for the evaporation and overflow of hydrochloric acid gas, and a full-size filter plate that can be detachably connected to the box body.

4. The ammonium sulfate mother liquor treatment equipment in the preparation of hydrogen cyanide according to claim 3, characterized in that, The bottom of the box is provided with a ballast tube and a switch valve installed on the ballast tube. The bottom of the box is also provided with several support columns, and the free ends of the support columns are all fixed with rubber anti-slip pads.

5. The ammonium sulfate mother liquor treatment equipment in the preparation of hydrogen cyanide according to claim 4, characterized in that, The full-size filter plate includes a main plate, sub-plates symmetrically slidably connected to both sides of the main plate, a sliding groove on the main plate, a sliding rod slidably connected to the sliding groove for adjusting the position of the sub-plates, and an elastic filter screen disposed between the sub-plates. A pull ring is fixed to the outer end of the main plate.

6. The ammonium sulfate mother liquor treatment equipment in the preparation of hydrogen cyanide according to claim 5, characterized in that, The elastic stirring evaporation assembly includes an evaporation plate, several electric heating resistance wires built into the evaporation plate, a battery pack electrically connected to the electric heating resistance wires and mounted on the back of the evaporation plate, several spring columns for supporting the evaporation plate, and several flexible ropes fixed to the top of the box body. The flexible ropes are equipped with agitating rods around their perimeter.

7. A process for treating ammonium sulfate mother liquor in the preparation of hydrogen cyanide, characterized in that, The process is achieved using an ammonium sulfate mother liquor treatment device for hydrogen cyanide preparation as described in claim 6, comprising the following steps: S01: The ammonium sulfate mother liquor after ammonia removal is put into the ammonium sulfate mother liquor feed pipe. After passing through the spiral pipe assembly, the speed is reduced and it reacts with the hydrochloric acid on the hydrochloric acid component plate to generate hydrochloric acid solution and sulfate precipitate. The sulfate precipitate stays, and the hydrochloric acid solution and ammonium sulfate mother liquor enter the filter evaporator along the spiral pipe assembly. S02: Control the temperature of the filter evaporator between 100° and 120° to achieve water evaporation. Utilize the volatile nature of hydrochloric acid gas to filter out the hydrochloric acid gas. Maintain this temperature until ammonium sulfate crystals precipitate, at which point the heating process ends.

8. The ammonium sulfate mother liquor treatment process in the preparation of hydrogen cyanide according to claim 7, characterized in that, In step S02, the temperature is precisely controlled to 110°.

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