CN110371942B - Production process of heavy potassium pyrophosphate returning flow - Google Patents
Production process of heavy potassium pyrophosphate returning flow Download PDFInfo
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- CN110371942B CN110371942B CN201910705885.8A CN201910705885A CN110371942B CN 110371942 B CN110371942 B CN 110371942B CN 201910705885 A CN201910705885 A CN 201910705885A CN 110371942 B CN110371942 B CN 110371942B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/38—Condensed phosphates
- C01B25/42—Pyrophosphates
- C01B25/425—Pyrophosphates of alkali metals
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Abstract
The invention discloses a process for manufacturing a return flow of heavy potassium pyrophosphate, which comprises the following steps of firstly, erecting return flow line equipment; step two, drying treatment in equipment; step three, inputting potassium pyrophosphate; step four, dust is sucked; step five, screening treatment; step six, sorting, conveying and bagging; step six, boxing and storing; in the first step, a material returning assembly line device is erected and installed on one side of a potassium pyrophosphate production line, and in the second step, before a material returning process of the device is to be used, a draught fan is electrified to work, so that the conveyor belt is always in a dry environment; the invention has the advantages that the construction cost of the whole transportation equipment for technical transformation is low, and the investment cost is reduced; the potassium pyrophosphate can be screened through the screen plate, so that the appearance granularity of the obtained product is more regular, the product is classified, sealed, guaranteed and collected, and convenient for later transportation, wherein the interior of the production line equipment is dried.
Description
Technical Field
The invention relates to the technical field of potassium pyrophosphate returning processes, in particular to a process for manufacturing a returning process of heavy potassium pyrophosphate.
Background
Potassium pyrophosphate refers to the potassium salt of pyrophosphoric acid; representative phosphates in poly (poly) phosphate fertilizers; typically a group of phosphorus-containing compounds formed by the reaction of pyrophosphoric acid with potassium hydroxide. The main application of the potassium pyrophosphate is to replace potassium cyanide and be used for non-cyanide electroplating. With the development of national industrial modernization, the demand of potassium pyrophosphate is increasing. The industrial application is also used for surface treatment, high-grade detergents, paint coatings, cleaners, dispersants, buffers, etc.; the food industry is used as emulsifiers, tissue modifiers, chelating agents, quality modifiers, etc.; the potassium pyrophosphate can also be prepared from dipotassium hydrogen phosphate, wherein the returning flow of the potassium pyrophosphate is an important step for processing the potassium pyrophosphate, but the transportation equipment in the existing potassium pyrophosphate processing flow has simpler structure, the traditional transportation equipment has high structure cost, the investment cost is increased, the obtained product has irregular appearance granularity, the phenomenon of moisture absorption is easy to occur, the dust pollution in the product in the traditional process is larger, and the environmental protection efficiency is low.
Disclosure of Invention
The invention aims to provide a process for manufacturing a return flow of heavy potassium pyrophosphate, which aims to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a process for preparing the return flow of heavy potassium pyrophosphate includes such steps as installing the return pipeline; step two, drying treatment in equipment; step three, inputting potassium pyrophosphate; step four, dust is sucked; step five, screening treatment; step six, sorting, conveying and bagging; step six, boxing and storing;
wherein in the first step, a material returning assembly line device is erected and installed on one side of the potassium pyrophosphate production line, the material returning assembly line device comprises an installation box, an outer protecting shell, an installation frame, a conveying belt, a sieve plate, a sliding block, a sliding groove, an impact block, a motor, a cam, a material discharging inclined plate, a feeding funnel, a dust collection box, a dust collector, a dust collection cover, a box door, a draught fan, a first installation box, a drying block, a second installation box, a first air conveying pipe, a first filter screen, an electric heating wire, a second air conveying pipe, a material outlet, a material conveying pipe and a second filter screen, the center of the outer wall of the top end of the installation box is penetrated and installed with the feeding funnel, the installation frame is fixedly installed on the outer wall of one side of the installation box, the conveying belt is rotatably installed on the outer wall of the top end of the installation frame and the middle part of the installation box, the outer protecting shell is wrapped by welding one side of the conveying belt outside the installation box, the utility model discloses a dust collector, including installation box, outer shell, dust collection box, dust collector and dust collector, be provided with the sieve on the inner wall at installation box middle part, welded fastening has the slider on the outer wall at sieve both ends, the spout has been seted up to installation box both sides inner wall correspondence slider, install box is located the both sides inner wall of spout below and inlays fixedly with motor, the output shaft one end fixed mounting of motor has the cam, correspond the cam welded fastening on the bottom outer wall of sieve, the installation box is located the inner wall of sieve below welded fastening has the ejection of compact swash plate, and the one end of ejection of compact swash plate runs through in the outside of installation box, the installation box is located one side inner wall of sieve top through-connection has the conveying pipeline, and the one end of conveying pipeline runs through the top that outer shell is located conveyer belt one side, welded fastening has the dust collection box on one side top outer wall of outer shell, the dust collection device comprises a dust collection box, a dust collection pipe, a dust collection cover, a first filter screen, a first air delivery pipe, a first installation box, a second filter screen, a drying block, a second filter screen, a first air delivery pipe, a first installation box, an induced draft fan and an induced draft fan, wherein the dust collection cover is fixedly embedded on one side inner wall of the installation box above the conveying pipe, the second filter screen is fixedly welded on one side inner wall of the dust collection cover, the dust collection end of the dust collection pipe is in through connection with one end of the dust collection cover through a pipeline, the induced draft fan is fixedly bolted on one side outer wall of the top end of the outer protective shell, the air suction end of the induced draft fan is in through connection with one side outer protective shell through the pipeline, the first installation box is fixedly welded on the top outer wall of the outer protective shell on one side of the induced draft fan, the drying block is filled in the first installation box, the air delivery end of the induced draft fan is in through connection with the first air delivery pipe on the other side top outer wall of the first installation box, and the first filter screen is all arranged at the junction of the first filter screen; the outer protective case is positioned on the outer wall of the top end of one side of the first mounting box, a second mounting box is fixedly welded on the inner wall of the middle part of the second mounting box, an electric heating wire is fixedly arranged on the inner wall of the middle part of the second mounting box, one end of the first air pipe penetrates through the inner wall of one side top end of the second mounting box, a second air pipe is connected on the outer wall of the bottom end of the other side of the second mounting box in a penetrating way, one end of the second air pipe penetrates through the inner part of the outer protective case, and a discharge hole is arranged on the outer wall of one end of the outer protective case positioned below the conveying belt in a penetrating way;
before the potassium pyrophosphate returning flow is carried out by using the returning flow line equipment, the induced draft fan is electrified to work, air in the outer protecting shell is input into the first mounting box, moisture is absorbed by the drying block in the box, the air is input into the second mounting box, and the heating wire is controlled to heat the air, so that the hot air flows back into the outer protecting shell, and the conveying belt is always in a dry environment;
in the third step, after the drying treatment in the equipment in the second step, potassium pyrophosphate is input into a feeding funnel through a potassium pyrophosphate production line, and a material returning flow work is carried out through a material returning production line device;
in the fourth step, in the process of inputting the potassium pyrophosphate in the third step, the dust collector is electrified to work, dust in the fallen potassium pyrophosphate is sucked through the dust suction hood, and the dust is input and collected into the dust collection box through the pipeline, so that dust suction is completed;
in the fifth step, potassium pyrophosphate is sucked and removed in the fourth step and falls onto the screen plate, meanwhile, the motor is used for driving the cam to rotate, the cam is matched with the collision block, the screen plate is enabled to vibrate up and down under the matched action of the sliding block and the sliding groove, small particles after potassium pyrophosphate is screened fall onto the discharge inclined plate, and full and uniform particles after potassium pyrophosphate is screened are input above the conveying belt through the conveying pipe;
in the step six, after screening treatment in the step five, collecting potassium pyrophosphate falling above a conveying belt through a sealing pocket at the bottom end of a discharge inclined plate, conveying the potassium pyrophosphate to a discharge port through the conveying belt, bagging and collecting the potassium pyrophosphate through the sealing pocket, classifying and collecting the potassium pyrophosphate with different size particles, and sealing the sealing pocket;
and in the seventh step, boxing and preserving the sealed sealing bags filled and sealed in the sixth step.
According to the technical scheme, the box door is arranged on the outer wall of one side of the dust box in the returning assembly line equipment.
According to the technical scheme, the sliding block and the sliding groove in the assembly line equipment are matched components, and lubricating oil is coated in the sliding groove.
According to the technical scheme, the collision block and the cam in the assembly line equipment are matched components, and the outer wall of the top end of the cam is in contact connection with the outer wall of the bottom end of the collision block.
According to the technical scheme, the screen plate in the assembly line equipment is inclined.
According to the technical scheme, the drying block in the production line equipment is a lime block.
According to the technical scheme, the temperature of the electric heating wire in the second step for heating the air is 100-200 ℃.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the technical transformation is carried out on the material returning assembly line equipment in the traditional heavy potassium pyrophosphate returning process, the whole structure is simpler, the structure cost of the whole transportation equipment is lower, and the investment cost is reduced; the potassium pyrophosphate can be screened through the sieve plate, so that the appearance granularity of the obtained product is more regular, the product is classified, the product is sealed, collected and transported in the later period conveniently, the interior of the production line equipment is dried, the potassium pyrophosphate is prevented from absorbing moisture, dust in the product can be absorbed through the arrangement of a dust absorption structure, and the environmental protection benefit is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic view in front elevation of the overall cut-away structure of the return line apparatus of the present invention;
FIG. 2 is a schematic view of the drying structure in the material returning assembly line of the present invention in front view;
FIG. 3 is a schematic view of a front view in section of a dust collection structure inside a return line device of the present invention;
FIG. 4 is an enlarged view of the structure of the area A of FIG. 1 in accordance with the present invention;
FIG. 5 is a flow chart of the present fabrication process;
in the figure: 1. a mounting box; 2. an outer protective shell; 3. a mounting frame; 4. a conveyor belt; 5. a sieve plate; 6. a slide block; 7. a chute; 8. an impact block; 9. a motor; 10. a cam; 11. a discharge sloping plate; 12. a feed hopper; 13. a dust collection box; 14. a dust collector; 15. a dust hood; 16. a door; 17. an induced draft fan; 18. a first mounting box; 19. drying the blocks; 20. a second mounting box; 21. a first gas pipe; 22. a first filter screen; 23. heating wires; 24. a second gas pipe; 25. a discharge port; 26. a material conveying pipe; 27. and a second filter screen.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-5, the present invention provides a technical solution: a process for preparing the return flow of heavy potassium pyrophosphate includes such steps as installing the return pipeline; step two, drying treatment in equipment; step three, inputting potassium pyrophosphate; step four, dust is sucked; step five, screening treatment; step six, sorting, conveying and bagging; step six, boxing and storing;
in the first step, a material returning assembly line device is erected and installed on one side of the potassium pyrophosphate production line, the material returning assembly line device comprises an installation box 1, an outer protective shell 2, an installation frame 3, a conveying belt 4, a screen plate 5, a sliding block 6, a sliding chute 7, an impact block 8, a motor 9, a cam 10, a material discharging inclined plate 11, a feeding funnel 12, a dust collection box 13, a dust collector 14, a dust collection cover 15, a box door 16, an induced draft fan 17, a first installation box 18, a drying block 19, a second installation box 20, a first air conveying pipe 21, a first filter screen 22, an electric heating wire 23, a second air conveying pipe 24, a material outlet 25, a material conveying pipe 26 and a second filter screen 27, wherein the center of the top end outer wall of the installation box 1 is penetrated and installed with the feeding funnel 12, the installation frame 3 is fixedly installed on the outer wall of one side of the installation box 1, the conveying belt 4 is rotatably installed on the middle part of the installation box 1 and the top end outer wall of the installation frame 3, the outer protecting shell 2 is welded and wrapped on one side of the outer part of the conveying belt 4, the sieve plate 5 is arranged on the inner wall of the middle part of the mounting box 1, the sliding blocks 6 are welded and fixed on the outer walls of the two ends of the sieve plate 5, the sliding grooves 7 are formed on the inner walls of the two sides of the mounting box 1 corresponding to the sliding blocks 6, the motor 9 is embedded and fixed on the inner walls of the two sides of the mounting box 1 below the sliding grooves 7, the cam 10 is fixedly arranged at one end of the output shaft of the motor 9, the collision block 8 is welded and fixed on the outer wall of the bottom end of the sieve plate 5 corresponding to the cam 10, the discharging inclined plate 11 is welded and fixed on the inner wall of the mounting box 1 below the sieve plate 5, one end of the discharging inclined plate 11 penetrates through the outer part of the mounting box 1, the conveying pipe 26 is connected on the inner wall of one side of the upper part of the sieve plate 5, one end of the conveying pipe 26 penetrates through the outer protecting shell 2 and is positioned on one side of the conveying belt 4, the dust collecting box 13 is welded and fixed on the outer wall of the top end of one side of the outer protecting shell 2, the dust collection box comprises a dust collection box 13, a dust collector 14, a draught fan 17, a first mounting box 18, a drying block 19, a first air pipe 21, a first box 18, a first filter screen 22, a second filter screen 27, a first filter screen 27, a second filter screen 27, a first filter screen 18, a second filter screen 27, a first filter screen 27, a second filter screen 27, a first air pipe 21, a first box 18, a first box 21 and a second filter screen 18, and an induced draft fan 17 are fixedly arranged on the outer wall of one side of the top end of the dust collection box 13 through bolts; the outer protective casing 2 is fixedly welded on the outer wall of the top end of one side of the first mounting box 18, the electric heating wire 23 is fixedly arranged on the inner wall of the middle part of the second mounting box 20, one end of the first air pipe 21 penetrates through the inner wall of the top end of one side of the second mounting box 20, the outer wall of the bottom end of the other side of the second mounting box 20 is in through connection with the second air pipe 24, one end of the second air pipe 24 penetrates through the inner part of the outer protective casing 2, and a discharge hole 25 is formed in the outer wall of one end of the outer protective casing 2, which is positioned below the conveying belt 4; a box door 16 is arranged on the outer wall of one side of the dust box 13 in the returning assembly line equipment, and the dust collected in the later-stage dust box 13 can be conveniently discharged through the box door 16; the sliding block 6 and the sliding groove 7 in the assembly line equipment are matched components, lubricating oil is coated in the sliding groove 7, and the sliding block 6 and the sliding groove 7 are matched for use, so that the up-and-down vibration of the later screen plate 5 is realized; the collision block 8 and the cam 10 in the assembly line equipment are matched components, and the top end outer wall of the cam 10 is in contact connection with the bottom end outer wall of the collision block 8; vibration of the screen plate 5 is realized through the cooperation of the collision block 8 and the cam 10;
in the second step, before the potassium pyrophosphate returning flow is performed by using the returning flow line device, the induced draft fan 17 is powered on to work, the air in the outer protecting shell 2 is input into the first mounting box 18, the air is absorbed with moisture by the drying block 19 in the box and then is input into the second mounting box 20, the air is heated by the control heating wire 23, and the hot air flows back into the outer protecting shell 2, so that the conveyor belt 4 is always in a dry environment; in the second step, the temperature of the electric heating wire 23 for heating the air is 100-200 ℃, so that the drying of the environment in the outer protective shell 2 is ensured;
in the third step, after the drying treatment in the equipment in the second step, potassium pyrophosphate is input into the feeding funnel 12 through a potassium pyrophosphate production line, and the returning flow work is performed through returning flow line equipment;
in the fourth step, in the process of inputting potassium pyrophosphate in the third step, the dust collector 14 is electrified to work, dust in the fallen potassium pyrophosphate is sucked through the dust hood 15, and the dust is input and collected into the dust collection box 13 through a pipeline, so that dust suction is completed;
in the fifth step, potassium pyrophosphate is sucked and removed in the fourth step and falls onto the screen plate 5, meanwhile, the motor 9 works to drive the cam 10 to rotate, the cam 10 is matched with the collision block 8, so that the screen plate 5 vibrates up and down under the matched action of the sliding block 6 and the sliding chute 7, the potassium pyrophosphate is sieved and falls on the discharge inclined plate 11, and the potassium pyrophosphate is sieved and fully and uniformly granulated and is input above the conveying belt 4 through the conveying pipe 26; the sieve plate 5 in the production line equipment is inclined, so that the discharge of particles after the screening of the potassium pyrophosphate in the later stage is facilitated; the drying block 19 in the production line equipment is a lime block, and moisture absorption is realized through the lime block;
in the step six, after screening treatment in the step five, collecting potassium pyrophosphate falling above the conveyer belt 4 through the sealing bags at the bottom end of the discharge inclined plate 11, conveying the potassium pyrophosphate to the discharge port 25 through the conveyer belt 4, bagging and collecting the potassium pyrophosphate with different size particles through the sealing bags, classifying and collecting the potassium pyrophosphate with different size particles, and sealing the sealing bags;
and in the seventh step, boxing and preserving the sealed sealing bags filled and sealed in the sixth step.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A process for preparing the return flow of heavy potassium pyrophosphate includes such steps as installing the return pipeline; step two, drying treatment in equipment; step three, inputting potassium pyrophosphate; step four, dust is sucked; step five, screening treatment; step six, sorting, conveying and bagging; step seven, boxing and storing; the method is characterized in that:
wherein in the first step, one side of the potassium pyrophosphate production line is provided with a material returning production line device, the material returning production line device comprises a mounting box (1), an outer protecting shell (2), a mounting frame (3), a conveying belt (4), a sieve plate (5), a sliding block (6), a sliding groove (7), a collision block (8), a motor (9), a cam (10), a discharging inclined plate (11), a feeding funnel (12), a dust collecting box (13), a dust collector (14), a dust collecting cover (15), a box door (16), a draught fan (17), a first mounting box (18), a drying block (19), a second mounting box (20), a first conveying pipe (21), a first filter screen (22), an electric heating wire (23), a second conveying pipe (24), a discharging port (25), a conveying pipe (26) and a second filter screen (27), the center of the top outer wall of the mounting box (1) is penetrated and is provided with the feeding funnel (12), one side outer wall of the mounting frame (3) is fixedly provided with the mounting frame (1), the conveying belt (4) is rotatably mounted on the top outer wall of the middle part of the mounting box (1) and the mounting frame (3), the conveying belt (4) is positioned on one side of the outer protecting shell (2), the utility model is characterized in that a sieve plate (5) is arranged on the inner wall of the middle part of the installation box (1), sliding blocks (6) are welded and fixed on the outer walls of the two ends of the sieve plate (5), sliding grooves (7) are formed in the inner walls of the two sides of the installation box (1) corresponding to the sliding blocks (6), a motor (9) is inlaid and fixed on the inner walls of the two sides of the installation box (1) below the sliding grooves (7), a cam (10) is fixedly arranged at one end of an output shaft of the motor (9), a collision block (8) is welded and fixed on the outer wall of the bottom end of the sieve plate (5) corresponding to the cam (10), a discharge inclined plate (11) is welded and fixed on the inner wall of the installation box (1) below the sieve plate (5), and one end of the discharging inclined plate (11) penetrates through the outside of the installation box (1), a conveying pipe (26) is connected on the inner wall of one side of the installation box (1) above the sieve plate (5), one end of the conveying pipe (26) penetrates through the outer protecting shell (2) and is positioned above one side of the conveying belt (4), a dust collection box (13) is fixedly welded on the outer wall of one side top end of the outer protecting shell (2), a dust collector (14) is fixedly connected on the outer wall of one side of the top end of the dust collection box (13) through bolts, a dust hood (15) is fixedly embedded on the inner wall of one side of the installation box (1) above the conveying pipe (26), the dust collection end of the dust collector (14) is in through connection with one end of the dust collection cover (15) through a pipeline, the dust conveying end of the dust collector (14) is through the inside of the dust collection box (13) through the pipeline, an induced draft fan (17) is fixedly connected to the outer wall of one side of the top end of the outer protective casing (2) through a bolt, the air suction end of the induced draft fan (17) is through the pipeline through the outer wall of one side of one end of the outer protective casing (2), a first mounting box (18) is fixedly welded on the outer wall of the top end of one side of the induced draft fan (2), a drying block (19) is filled in the first mounting box (18), the air conveying end of the induced draft fan (17) is through the inner wall of one side of the first mounting box (18) through the pipeline, a first air conveying pipe (21) is through connected to the outer wall of the top end of the other side of the first mounting box (18), and the air conveying end of the induced draft fan (17) is connected to the first air conveying box (18) through the first air conveying box (22); the outer protective case (2) is positioned on the top end outer wall of one side of the first mounting box (18), a second mounting box (20) is fixedly welded on the middle inner wall of the second mounting box (20), an electric heating wire (23) is fixedly installed on the middle inner wall of the second mounting box (20), one end of the first air pipe (21) penetrates through the top end inner wall of one side of the second mounting box (20), a second air pipe (24) is connected on the bottom end outer wall of the other side of the second mounting box (20) in a penetrating way, one end of the second air pipe (24) penetrates through the inner part of the outer protective case (2), and a discharge hole (25) is formed in the outer wall, below the conveying belt (4), of one end of the outer protective case (2) in a penetrating way;
before the potassium pyrophosphate returning flow is carried out by using the returning flow line equipment, the induced draft fan (17) is electrified to work, air in the outer protecting shell (2) is input into the first mounting box (18), moisture is absorbed by the air through the drying block (19) in the box, the air is input into the second mounting box (20), and the air is heated by the control heating wire (23), so that the hot air flows back into the outer protecting shell (2), and the conveyor belt (4) is always in a dry environment;
in the third step, after the drying treatment in the equipment in the second step, potassium pyrophosphate is input into a feeding funnel (12) through a potassium pyrophosphate production line, and a material returning flow work is carried out through a material returning production line device;
in the fourth step, in the potassium pyrophosphate input process in the third step, the dust collector (14) is electrified to work, dust in the fallen potassium pyrophosphate is sucked through the dust hood (15), and the dust is input and collected into the dust collection box (13) through a pipeline, so that dust suction is completed;
in the fifth step, after dust is sucked and removed in the fourth step, potassium pyrophosphate falls onto the screen plate (5), meanwhile, a motor (9) works to drive a cam (10) to rotate, the cam (10) is matched with an impact block (8) to enable the screen plate (5) to vibrate up and down under the matching action of a sliding block (6) and a sliding groove (7), particles of the potassium pyrophosphate after screening are small and fall onto a discharge inclined plate (11), and particles of the potassium pyrophosphate after screening, which are full and uniform, are input above a conveying belt (4) through a conveying pipe (26);
in the step six, after screening treatment in the step five, collecting potassium pyrophosphate falling above a conveying belt (4) through a sealing pocket at the bottom end of a discharge inclined plate (11), conveying the potassium pyrophosphate to a discharge port (25) through the conveying belt (4), bagging and collecting the potassium pyrophosphate with different size particles through the sealing pocket, classifying and collecting the potassium pyrophosphate with different size particles, and sealing the sealing pocket;
and in the seventh step, boxing and preserving the sealed sealing bags filled and sealed in the sixth step.
2. The process for preparing the return flow of the heavy potassium pyrophosphate according to claim 1, which is characterized in that: a box door (16) is arranged on the outer wall of one side of the dust box (13) in the returning assembly line equipment.
3. The process for preparing the return flow of the heavy potassium pyrophosphate according to claim 1, which is characterized in that: the sliding block (6) and the sliding groove (7) in the assembly line equipment are matched components, and lubricating oil is coated in the sliding groove (7).
4. The process for preparing the return flow of the heavy potassium pyrophosphate according to claim 1, which is characterized in that: in the assembly line equipment, the collision block (8) and the cam (10) are matched components, and the top end outer wall of the cam (10) is in contact connection with the bottom end outer wall of the collision block (8).
5. The process for preparing the return flow of the heavy potassium pyrophosphate according to claim 1, which is characterized in that: the sieve plate (5) in the assembly line equipment is inclined.
6. The process for preparing the return flow of the heavy potassium pyrophosphate according to claim 1, which is characterized in that: the drying block (19) in the pipeline equipment is a lime block.
7. The process for preparing the return flow of the heavy potassium pyrophosphate according to claim 1, which is characterized in that: and in the second step, the temperature of the electric heating wire (23) for heating the air is 100-200 ℃.
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