A process for producing mineral-derived nitrohumic acid

Abstract

This invention provides a process for producing mineral-derived nitrohumic acid, belonging to the field of humic acid production technology. It includes a raw material silo, an acid mixing tank, a quantitative conveyor, a vertical reactor, a vibrating screen, a temporary storage bin, a Raymond mill, and a collector. The production process includes the following steps: The quantitative conveyor transports raw coal from the raw material silo to the vertical reactor. Simultaneously, a pump sprays prepared nitric acid from the acid mixing tank onto the raw material in the vertical reactor to react with it. This allows the material to tumble and stir within the vertical reactor, ensuring that a large amount of raw material is uniformly mixed and activated in a short time. This invention incorporates a rotating scraper assembly to remove the mixture adhering to the inner wall of the mixing tank, improving work efficiency. Even with different specific gravities and particle sizes, good mixing is achieved under the staggered spraying of the stirring blades, eliminating dead zones. The quantitative conveyor ensures a constant coal-to-acid ratio and stable product quality during the reaction process.

Description

Technical Field

[0001] This invention relates to the field of humic acid production technology, and in particular to a process for producing mineral-derived nitrohumic acid. Background Technology

[0002] Mineral-derived nitrohumic acid is produced by the oxidation and nitration of lignite with nitric acid. This process introduces nitro groups and increases the number of active functional groups, particularly the tautomerism of the p-nitrophenol structure, which leads to the formation of quinone structures. This significantly enhances the chemical and biological activity of humic acid. The activity of nitrohumic acid is far superior to that of ordinary humic acid.

[0003] The humic acid production equipment disclosed in announcement number CN113145055A provides a device for producing humic acid, which further includes a flue gas treatment system, a hot water circulation system, a cold water circulation system, and a dust removal system, all connected to a nitric acid preparation system. The nitric acid preparation system includes a pusher, an acid storage tank, a mixing tank, and an activation reactor. The mixing tank is also connected to a waste acid tank. There are two pushers, two acid storage tanks, two mixing tanks, and two activation reactors. The humic acid production equipment described in this invention not only fulfills the basic function of humic acid production but also increases the stirring range and mixing volume, ensuring constant reaction conditions, improving the recovery rate of nitric acid, and solving problems such as insufficient humic acid activity or decomposition of effective components, high acid content in the product, fluctuating water content, and low overall quality.

[0004] However, the above solution has the following drawbacks:

[0005] 1. The raw materials entering the reactor cannot be accurately measured, and the ratio of coal acid to nitric acid is not constant, resulting in unstable product quality.

[0006] 2. The reaction process is a single reaction, and it cannot be determined whether all raw materials react with nitric acid, so the product quality is uncontrollable;

[0007] 3. The reactor is horizontal, and dead corners can easily exist in the corners during the stirring process, resulting in incomplete product reaction. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a process for producing mineral-derived nitrohumic acid to address the problems in existing humic acid production processes where the reactor is horizontal, dead corners are easily formed during stirring, resulting in incomplete product reaction, inaccurate measurement of raw materials entering the reactor, inconsistent coal-nitric acid ratio, unstable product quality, and the fact that the reaction process is a single reaction, making it impossible to determine whether all raw materials react with nitric acid, thus leading to uncontrollable product quality.

[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0010] A process for producing mineral-derived nitrohumic acid includes a raw material silo, an acid mixing tank, a quantitative conveyor, a vertical reactor, a vibrating screen, a temporary storage silo, a Raymond mill, and a collector. The production process includes the following steps.

[0011] Step 1: The quantitative conveyor transports the raw coal from the raw material silo to the vertical reactor. At the same time, the acid pump sprays the prepared nitric acid from the acid mixing tank onto the raw material in the vertical reactor to react with it. The material is tumbled and stirred inside the vertical reactor to ensure that a large amount of raw material is mixed evenly and activated in a short time.

[0012] Step 2: The activated product enters the vibrating screen through the connecting pipe from the lower outlet of the vertical reactor for screening. The activated material enters the material storage bin through the oversize outlet of the vibrating screen, and the unactivated material is returned to the raw material bin through the undersize outlet of the vibrating screen.

[0013] Step 3: Next, the activated material enters the Raymond mill, where physical grinding further activates the product and grinds it to the required mesh size. The finished product then enters the collector and is finally packaged from the material outlet.

[0014] Preferably, in step one, the amount and speed of nitric acid sprayed can be adjusted by the acid mixing pump depending on the source of the raw materials and the product quality requirements.

[0015] Preferably, the acid mixing tank and the vertical reactor are connected to a waste gas treatment system. A small amount of flue gas is generated during the reaction in the vertical reactor. The flue gas and a small amount of nitric acid volatiles in the acid mixing tank are treated by the waste gas treatment system.

[0016] Preferably, the waste gas treatment system is a waste gas absorption system used in the dry production of mineral-derived nitrohumic acid.

[0017] Preferably, the Raymond mill and the collector are connected to a dust collector, a conveying pump is installed between the dust collector and the collector, and the dust collector is provided with a dust outlet.

[0018] Preferably, the vertical reactor includes a stirring tank, inside which a hollow shaft is provided. A mounting plate is fixedly connected to the bottom end of the hollow shaft. Rotating rods parallel to the inner wall of the stirring tank are rotatably connected to both sides of the mounting plate via bearings. Rollers are fixedly connected to the top ends of the rotating rods, and the rollers contact the inner wall of the stirring tank. A scraping assembly is provided at the bottom end of the rotating rods. The top end of the hollow shaft penetrates the upper surface of the stirring tank. The hollow shaft is rotatably connected to the stirring tank via bearings. A rotating shaft is rotatably connected inside the hollow shaft via bearings. A spiral stirrer is fixedly connected to the outer surface of the bottom end of the rotating shaft. A drive assembly is provided at the top ends of the hollow shaft and the rotating shaft. A nitric acid spraying assembly is installed at the top inner interior of the stirring tank.

[0019] Preferably, the mixing tank has a conical structure, a discharge pipe is fixedly connected to the bottom of the mixing tank, and a feed pipe and an exhaust pipe are fixedly connected to the left and right sides of the upper surface of the mixing tank, respectively.

[0020] Preferably, the scraping assembly includes a fixed box fixedly connected to the bottom end of the rotating rod. A rectangular slider is slidably connected inside the fixed box. Fixed rods are fixedly connected to both sides of the rectangular slider. The end of the fixed rod away from the rectangular slider passes through the fixed box and is fixedly connected to a fixed plate. The fixed rod is slidably connected to the fixed box. A spring is sleeved on the outer surface of the fixed rod inside the fixed box. A scraper is fixedly connected to one side of the fixed plate. The scraper is in contact with the inner wall of the mixing tank.

[0021] Preferably, the drive assembly includes a housing fixedly connected to the upper surface of the mixing tank, a geared motor fixedly connected to the upper surface of the housing, the output end of the geared motor being located inside the mixing tank and fixedly connected to a first gear and a second gear, the first gear being larger than the diameter of the second gear, the top ends of the rotating shaft and the hollow shaft being located inside the housing and fixedly connected to a third gear and a fourth gear respectively, the third gear and the fourth gear being meshed with the first gear and the second gear respectively.

[0022] Preferably, the nitric acid spraying assembly includes a fixed pipe fixedly connected to the inside of the top of the mixing tank. Multiple spray nozzles are installed on the lower surface of the right end of the fixed pipe. The left end of the fixed pipe is connected to the acid dispensing pump. A control box is installed on the fixed pipe. A partition is fixedly connected inside the control box. A through hole is opened on the partition. A sealing block is provided on the left side of the through hole. A sliding rod is fixedly connected to the right side of the sealing block. The right end of the sliding rod passes through the control box and is fixedly connected to an arc-shaped block. A second spring is sleeved on the outer surface of the sliding rod. The sliding rod is slidably connected to the control box.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] 1. A vertical reactor is adopted, and a scraper assembly with both revolution and rotation is set to scrape off the mixture adhering to the inner wall of the mixing tank, so that it is fully mixed and uniform, shortens the mixing time, and improves work efficiency. Even if the specific gravity and particle size of the materials are different, good mixing effect can be achieved under the staggered spraying of the stirring blades, and there are no dead corners.

[0025] 2. When the roller rotates to the left, it will squeeze the arc-shaped block. After the arc-shaped block is squeezed, it will drive the slide rod and the sealing block to move to the left and compress the second spring. At this time, the through hole is exposed, connecting the left and right sides of the fixed tube. The prepared nitric acid in the acid tank is sprayed out from the spray nozzle along the fixed tube. After the stirring stops, the sealing block blocks the through hole by the restoring force of the second spring, thereby preventing the nitric acid from spraying out and realizing the automatic spraying of nitric acid to avoid waste.

[0026] 3. A quantitative conveyor is used for raw material feeding to ensure a constant coal-to-acid ratio and stable product quality during the reaction process.

[0027] 4. Through screening, unactivated materials are re-entered into the raw material silo for secondary activation, ensuring controllable product quality.

[0028] 5. The activated product undergoes further physical grinding to fully react and improve the activation quality of the product. Attached Figure Description

[0029] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the art to implement and use the present disclosure.

[0030] Figure 1 This is a schematic diagram of the process structure for the production of mineral-derived nitrohumic acid.

[0031] Figure 2 This is a schematic diagram of the structure of a vertical reactor used in the production process of mineral-derived nitrohumic acid.

[0032] Figure 3 This is a cross-sectional schematic diagram of a vertical reactor used in the production process of mineral-derived nitrohumic acid.

[0033] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0034] Figure 5 for Figure 3 Enlarged structural diagram at point B;

[0035] Figure 6 This is a schematic diagram of the internal structure of a vertical reactor used in the production process of mineral-derived nitrohumic acid.

[0036] Figure 7 This is a schematic diagram of the scraping assembly used in the production process of mineral-derived nitrohumic acid.

[0037] [Figure Labels]

[0038] 1. Raw material silo; 2. Acid mixing tank; 3. Quantitative conveyor; 4. Vertical reactor; 5. Vibrating screen; 6. Temporary storage silo; 7. Raymond mill; 8. Collector; 9. Acid mixing pump; 10. Oversize outlet; 11. Undersize outlet; 12. Material outlet; 13. Waste gas treatment system; 14. Dust collector; 15. Conveying pump; 16. Dust outlet; 17. Mixing tank; 18. Hollow shaft; 19. Mounting plate; 20. Rotating rod; 21. Roller; 22. Scraper assembly; 23. Rotating shaft; 24. Spiral agitator; 25. Drive assembly; 26. Nitric acid spraying assembly; 1701. Discharge pipe; 170 2. Feed pipe; 1703. Exhaust gas outlet pipe; 2201. Fixed box; 2202. Rectangular slider; 2203. Fixed rod; 2204. Fixed plate; 2205. Spring; 2206. Scraper; 2501. Box body; 2502. Gear motor; 2503. First gear; 2504. Second gear; 2505. Third gear; 2506. Fourth gear; 2601. Fixed pipe; 2602. Spray nozzle; 2603. Control box; 2604. Partition plate; 2605. Through hole; 2606. Sealing block; 2607. Slide rod; 2608. Arc block; 2609. Second spring.

[0039] As shown in the figure, specific structures and devices are labeled in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0040] The following describes in detail a process for producing mineral-derived nitrohumic acid according to the present invention, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0041] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0042] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0043] It is understood that the meanings of “on”, “above” and “above” in this disclosure should be interpreted in the broadest sense, such that “on” means not only “directly on” something, but also includes something with an intermediary feature or layer, and that “above” or “above” means not only “on” something, but also includes something “above” or “above” without an intermediary feature or layer.

[0044] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0045] like Figure 1-7 As shown, an embodiment of the present invention provides a process for producing mineral-derived nitrohumic acid, including a raw material silo 1, an acid mixing tank 2, a quantitative conveyor 3, a vertical reactor 4, a vibrating screen 5, a temporary storage silo 6, a Raymond mill 7, and a collector 8. The production process includes the following steps.

[0046] Step 1: The quantitative conveyor 3 transports the raw coal in the raw material silo 1 to the vertical reactor 4. At the same time, the acid pump 9 sprays the prepared nitric acid in the acid tank 2 onto the raw material in the vertical reactor 4 to react with it, so that the material rolls and stirs up and down in the vertical reactor 4 to ensure that a large amount of raw material is mixed evenly and activated in a short time.

[0047] Step 2: The activated product enters the vibrating screen 5 through the connecting pipe from the lower outlet of the vertical reactor 4 for screening. The activated material enters the material storage bin 6 through the oversize outlet 10 of the vibrating screen 5, while the unactivated material returns to the raw material bin 1 through the undersize outlet 11 of the vibrating screen 5.

[0048] Step 3: Next, the activated material enters Raymond mill 7, where physical grinding further activates the product and grinds it to the required mesh size. The qualified product enters the collector 8 and is finally packaged through material outlet 12.

[0049] In this embodiment, in step one, the amount and speed of nitric acid sprayed are adjustable by the acid mixing pump 9, depending on the source of the raw materials and the product quality requirements.

[0050] In this embodiment, the acid mixing tank 2 and the vertical reactor 4 are connected to the waste gas treatment system 13. A small amount of flue gas is generated during the reaction process in the vertical reactor 4. The flue gas and a small amount of nitric acid volatiles in the acid mixing tank 2 are treated by the waste gas treatment system 13.

[0051] In this embodiment, the waste gas treatment system 13 is selected from the waste gas absorption system in the dry production of mineral-derived nitrohumic acid.

[0052] In this embodiment, a dust collector 14 is connected to the Raymond mill 7 and the material collector 8. A conveying pump 15 is installed between the dust collector 14 and the material collector 8. A dust outlet 16 is provided on the dust collector 14.

[0053] like Figure 1 and Figure 3 As shown, in this embodiment, the vertical reactor 4 includes a stirring tank 17. A hollow shaft 18 is provided inside the stirring tank 17. A mounting plate 19 is fixedly connected to the bottom end of the hollow shaft 18. Rotating rods 20 parallel to the inner wall of the stirring tank 17 are rotatably connected to the left and right sides of the mounting plate 19 via bearings. Rollers 21 are fixedly connected to the top end of the rotating rods 20 and contact the inner wall of the stirring tank 17. A scraping assembly 22 is provided at the bottom end of the rotating rods 20. The top end of the hollow shaft 18 penetrates the upper surface of the stirring tank 17. The hollow shaft 18 is rotatably connected to the stirring tank 17 via bearings. A rotating shaft 23 is rotatably connected inside the hollow shaft 18 via bearings. A spiral stirrer 24 is fixedly connected to the outer surface of the bottom end of the rotating shaft 23. A drive assembly 25 is provided at the top end of the hollow shaft 18 and the rotating shaft 23. A nitric acid spraying assembly 26 is installed at the top inner part of the stirring tank 17.

[0054] This configuration allows the acid pump 9 to spray the prepared nitric acid from the acid tank 2 onto the raw materials in the vertical reactor 4 for reaction. Simultaneously, the drive assembly 25 drives the rotating shaft 23 and the hollow shaft 18 to rotate. During the rotation of the rotating shaft 23, the spiral stirrer 24 can be rotated. The raw materials and nitric acid are lifted from the bottom and center to the top of the vertical reactor 4 by the rotation speed of the spiral stirrer 24, and then the material is scattered, allowing the material to tumble and mix up and down in the mixing tank 17. During the rotation of the hollow shaft 18, the scraping assembly 22 can scrape off the mixture adhering to the inner wall of the mixing tank 17, making it fully mixed and improving the mixing efficiency of the vertical reactor 4.

[0055] like Figure 2 and Figure 3 As shown, in this embodiment, the mixing tank 17 has a conical structure. The bottom end of the mixing tank 17 is fixedly connected to the discharge pipe 1701, and the left and right sides of the upper surface of the mixing tank 17 are respectively fixedly connected to the feed pipe 1702 and the exhaust pipe 1703.

[0056] In this configuration, the quantitative conveyor 3 transports the raw coal in the raw material silo 1 to the vertical reactor 4 through the feed pipe 1702. The activated product then enters the vibrating screen 5 through the discharge pipe 1701 of the vertical reactor 4 and the connecting pipe for screening.

[0057] like Figure 3 , Figure 6 and Figure 7 As shown, in this embodiment, the scraping assembly 22 includes a fixed box 2201 fixedly connected to the bottom of the rotating rod 20. A rectangular slider 2202 is slidably connected inside the fixed box 2201. Fixed rods 2203 are fixedly connected to both sides of the rectangular slider 2202. One end of the fixed rod 2203 away from the rectangular slider 2202 passes through the fixed box 2201 and is fixedly connected to a fixed plate 2204. The fixed rod 2203 is slidably connected to the fixed box 2201. A spring 2205 is sleeved on the outer surface of the fixed rod 2203 inside the fixed box 2201. A scraper 2206 is fixedly connected to one side of the fixed plate 2204. The scraper 2206 is in contact with the inner wall of the mixing tank 17.

[0058] The spring 2205 is set in such a way that the scraper 2206 is pressed tightly against the inner wall of the mixing tank 17. During the rolling process, the roller 21 can drive the rotating rod 20, the fixed box 2201, the fixed rod 2203, the fixed plate 2204 and the scraper 2206 to rotate. During the rotation, the scraper 2206 scrapes off the material thrown against the inner wall of the mixing tank 17.

[0059] like Figure 3 and Figure 5 As shown, in this embodiment, the drive assembly 25 includes a housing 2501 fixedly connected to the upper surface of the mixing tank 17. A geared motor 2502 is fixedly connected to the upper surface of the housing 2501. The output end of the geared motor 2502 is located inside the mixing tank 17 and is fixedly connected to a first gear 2503 and a second gear 2504. The diameter of the first gear 2503 is larger than that of the second gear 2504. The top ends of the rotating shaft 23 and the hollow shaft 18 are both located inside the housing 2501 and are fixedly connected to a third gear 2505 and a fourth gear 2506, respectively. The third gear 2505 and the fourth gear 2506 are respectively meshed with the first gear 2503 and the second gear 2504.

[0060] This configuration allows the starting gear motor 2502 to drive the first gear 2503 and the second gear 2504 to rotate. During rotation, the first gear 2503 and the second gear 2504 cooperate with the third gear 2505 and the fourth gear 2506 respectively to drive the rotating shaft 23 and the hollow shaft 18 to rotate.

[0061] like Figure 3 and Figure 4 As shown, in this embodiment, the nitric acid spraying assembly 26 includes a fixed pipe 2601 fixedly connected to the inside of the top of the mixing tank 17. Multiple spray nozzles 2602 are installed on the lower surface of the right end of the fixed pipe 2601. The left end of the fixed pipe 2601 is connected to the acid pump 9. A control box 2603 is installed on the fixed pipe 2601. A partition 2604 is fixedly connected inside the control box 2603. A through hole 2605 is opened on the partition 2604. A sealing block 2606 is provided on the left side of the through hole 2605. A sliding rod 2607 is fixedly connected to the right side of the sealing block 2606. The right end of the sliding rod 2607 passes through the control box 2603 and is fixedly connected to an arc-shaped block 2608. A second spring 2609 is sleeved on the outer surface of the sliding rod 2607. The sliding rod 2607 is slidably connected to the control box 2603.

[0062] This setup involves installing a nitric acid spraying assembly 26 above the vertical reactor 4, which sprays the prepared nitric acid from the acid mixing tank 2 onto the raw materials in the vertical reactor 4 via the acid mixing pump 9 to react with them.

[0063] The technical solution provided by this invention involves placing raw coal in a raw material silo 1 during production. A quantitative conveyor 3 transports the raw coal from the silo 1 to a vertical reactor 4. A nitric acid spraying assembly 26 is installed above the vertical reactor 4. Acid pump 9 sprays the prepared nitric acid from the acid mixing tank 2 onto the raw materials in the vertical reactor 4 to react with the nitric acid. Simultaneously, a reduction motor 2502 drives the first gear 2503 and the second gear 2504 to rotate. During rotation, the first gear 2503 and the second gear 2504 engage with the third gear 2505 and the fourth gear 2506 respectively, driving the rotating shaft 23 and the hollow shaft 18 to rotate. The rotating shaft 23, in turn, drives the spiral stirrer 24 to rotate. The raw materials and nitric acid are then stirred in the vertical reactor 4 by the rotational speed of the spiral stirrer 24, which lifts the raw materials from the bottom to the center. At the top, the material is then thrown out, causing it to tumble and mix inside the mixing tank 17. Since the material sprayed at the beginning of the mixing process is not fully wetted, the mixture will be continuously thrown against the inner wall of the mixing tank 17 and accumulate. At this time, the hollow shaft 18 can drive the mounting plate 19, the rotating rod 20 and the roller 21 to rotate during the rotation. The roller 21 rolls along the inner wall of the mixing tank 17 during the rotation. During the rolling process, the roller 21 can drive the rotating rod 20, the fixed box 2201, the fixed rod 2203, the fixed plate 2204 and the scraper 2206 to rotate. During the rotation, the scraper 2206 scrapes off the material thrown against the inner wall of the mixing tank 17. Thus, by setting up the scraper assembly 22 with revolution and rotation, the mixture adhering to the inner wall of the mixing tank 17 is scraped off, making it fully mixed and uniform, thus improving the mixing efficiency of the vertical reactor 4.

[0064] At the same time, the roller 21 rotates to the left and squeezes the arc block 2608. After being squeezed, the arc block 2608 drives the slide rod 2607 and the sealing block 2606 to move to the left and compress the second spring 1609. At this time, the through hole 2605 is exposed, making the left and right sides of the fixed tube 2601 connected. The nitric acid prepared in the acid tank 2 is sprayed out from the spray nozzle 2602 along the fixed tube 2601. After the stirring stops, the sealing block 2606 blocks the through hole 2605 by the restoring force of the second spring 1609, thereby preventing the nitric acid from spraying out and realizing the automatic spraying of nitric acid to avoid waste.

[0065] The uniformly mixed materials are activated in the vertical reactor 4. The activated product enters the vibrating screen 5 through the discharge pipe 1701 of the vertical reactor 4 and the connecting pipe for screening. Because the raw materials form agglomerates after the activation reaction with nitric acid, the activated material enters the material storage bin 6 through the oversize outlet 10 of the vibrating screen 5. The unactivated material returns to the raw material bin 1 through the undersize outlet 11 of the vibrating screen 5. Then, the fully activated material enters the Raymond mill 7, where physical grinding further activates the product and grinds it to the required mesh size. The qualified product enters the collector 8 and is finally packaged through the material outlet 12 on the collector 8.

[0066] During the reaction process in the vertical reactor 4, a small amount of flue gas is generated. The flue gas is treated by the waste gas treatment system 13. A small amount of nitric acid volatiles in the acid mixing tank 2 also enter the waste gas treatment system 13 for treatment. The waste gas treatment system 13 can be selected from the waste gas absorption system for the dry production of mineral-derived nitrohumic acid, which is announced in CN216457986U. Dust is generated during the use of Raymond mill 7 and collector 8. The dust is treated by dust collector 14. The collected dust is discharged from dust outlet 16 for further treatment.

[0067] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0068] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc.

[0069] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A process for producing mineral-derived nitrohumic acid, characterized in that, The equipment includes a raw material silo, an acid mixing tank, a quantitative conveyor, a vertical reactor, a vibrating screen, a temporary storage silo, a Raymond mill, and a collector. The production process includes the following steps. Step 1: The quantitative conveyor transports the raw coal from the raw material silo to the vertical reactor. At the same time, the acid pump sprays the prepared nitric acid from the acid mixing tank onto the raw material in the vertical reactor to react with it. The material is tumbled and stirred inside the vertical reactor to ensure that a large amount of raw material is mixed evenly and activated in a short time. Step 2: The activated product enters the vibrating screen through the connecting pipe from the lower outlet of the vertical reactor for screening. The activated material enters the material storage bin through the oversize outlet of the vibrating screen, and the unactivated material is returned to the raw material bin through the undersize outlet of the vibrating screen. Step 3: Next, the activated material enters the Raymond mill, where physical grinding further activates the product and grinds it to the required mesh size. The finished product then enters the collector and is finally packaged from the material outlet. The vertical reactor includes a stirring tank, inside which is a hollow shaft. A mounting plate is fixedly connected to the bottom of the hollow shaft. Rotating rods parallel to the inner wall of the stirring tank are rotatably connected to both sides of the mounting plate via bearings. Rollers are fixedly connected to the top of each rotating rod, and the rollers contact the inner wall of the stirring tank. A scraper assembly is located at the bottom of the rotating rod. The top of the hollow shaft penetrates the upper surface of the stirring tank and is rotatably connected to the stirring tank via bearings. A rotating shaft is rotatably connected inside the hollow shaft via bearings. A spiral stirrer is fixedly connected to the outer surface of the bottom end of the rotating shaft. A drive assembly is located at the top of the hollow shaft and the rotating shaft. A nitric acid spraying assembly is installed at the top inner interior of the stirring tank. The scraping assembly includes a fixed box fixedly connected to the bottom of the rotating rod. A rectangular slider is slidably connected inside the fixed box. Fixed rods are fixedly connected to both sides of the rectangular slider. The end of the fixed rod away from the rectangular slider passes through the fixed box and is fixedly connected to a fixed plate. The fixed rod is slidably connected to the fixed box. A spring is sleeved on the outer surface of the fixed rod inside the fixed box. A scraper is fixedly connected to one side of the fixed plate. The scraper is in contact with the inner wall of the mixing tank. The nitric acid spraying assembly includes a fixed pipe fixedly connected to the inside of the top of the mixing tank. Multiple spray nozzles are installed on the lower surface of the right end of the fixed pipe. The left end of the fixed pipe is connected to the acid dispensing pump. A control box is installed on the fixed pipe. A partition is fixedly connected inside the control box. A through hole is opened on the partition. A sealing block is provided on the left side of the through hole. A sliding rod is fixedly connected to the right side of the sealing block. The right end of the sliding rod passes through the control box and is fixedly connected to an arc-shaped block. When the roller rotates to the left, it will squeeze the arc-shaped block. A second spring is sleeved on the outer surface of the sliding rod. The sliding rod is slidably connected to the control box.

2. The process for producing mineral-derived nitrohumic acid according to claim 1, characterized in that, In step one, the amount and speed of nitric acid sprayed can be adjusted by the acid mixing pump depending on the source of the raw materials and the product quality requirements.

3. The process for producing mineral-derived nitrohumic acid according to claim 2, characterized in that, The acid mixing tank and the vertical reactor are connected to a waste gas treatment system. A small amount of flue gas is generated during the reaction in the vertical reactor. The flue gas and a small amount of nitric acid volatiles in the acid mixing tank are treated by the waste gas treatment system.

4. The process for producing mineral-derived nitrohumic acid according to claim 3, characterized in that, The waste gas treatment system is selected from the waste gas absorption system used in the dry production of mineral-derived nitrohumic acid.

5. The process for producing mineral-derived nitrohumic acid according to claim 4, characterized in that, The Raymond mill and the collector are connected to a dust collector, a conveying pump is installed between the dust collector and the collector, and the dust collector is provided with a dust outlet.

6. The process for producing mineral-derived nitrohumic acid according to claim 1, characterized in that, The mixing tank has a conical structure. A discharge pipe is fixedly connected to the bottom of the mixing tank, and an inlet pipe and an exhaust pipe are fixedly connected to the left and right sides of the upper surface of the mixing tank, respectively.

7. The process for producing mineral-derived nitrohumic acid according to claim 1, characterized in that, The drive assembly includes a housing fixedly connected to the upper surface of the mixing tank. A geared motor is fixedly connected to the upper surface of the housing. The output end of the geared motor is located inside the mixing tank and is fixedly connected to a first gear and a second gear. The diameter of the first gear is larger than that of the second gear. The top ends of the rotating shaft and the hollow shaft are both located inside the housing and are fixedly connected to a third gear and a fourth gear, respectively. The third gear and the fourth gear are respectively meshed with the first gear and the second gear.

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