Device for producing humic acid by using lignite

Abstract

The utility model belongs to a device for producing humic acid by using lignite. Comprising a lignite bin, the lignite bin is connected with a lignite wax extraction unit through a rod mill, a liquid phase of the lignite wax extraction unit is connected with a lignite wax purification unit, and a solid phase of the lignite wax extraction unit is connected with a humic acid production unit. The lignite wax purification unit, the humic acid production unit and the lignite wax extraction unit form a leaching agent recycling unit; the tail end of the lignite wax purification unit is connected with a lignite wax finished product tank; the tail end of the humic acid production unit is connected with a humic acid finished product tank; the method has the characteristics that the design is reasonable, the content of lignite wax in a humic acid product is effectively reduced, related water-soluble fertilizer pipelines are prevented from being blocked, and water-soluble fertilizer compounding is conveniently realized.

Description

Technical Field

[0001] This utility model belongs to the field of humic acid production technology, specifically a device for producing humic acid using lignite. Background Technology

[0002] Most existing humic acid production uses lignite as raw material. The production technology involves extracting humic acids through alkali dissolution and acid precipitation, followed by concentration and drying to form dry granules. Humic acid products are often applied as water-soluble fertilizers. However, when these products are reconstituted with water, a layer of wax (lignite wax) floats on the surface of the reconstituted liquid. This lignite wax can easily clog pipelines in water-soluble fertilizers and cause inconvenience when compounding them, severely impacting the user experience and hindering the promotion of humic acid water-soluble fertilizers. Utility Model Content

[0003] To overcome the above deficiencies, this utility model provides an apparatus for producing humic acid from lignite, thereby solving the technical problems existing in the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] An apparatus for producing humic acid from lignite includes a lignite silo, which is connected to a lignite wax extraction unit via a rod mill. The liquid phase of the lignite wax extraction unit is connected to a lignite wax purification unit, and the solid phase of the lignite wax extraction unit is connected to a humic acid production unit. The lignite wax purification unit and the humic acid production unit, together with the lignite wax extraction unit, constitute a leaching agent recycling unit. The end of the lignite wax purification unit is connected to a lignite wax finished product tank, and the end of the humic acid production unit is connected to a humic acid finished product tank.

[0006] The beneficial effects of this utility model are as follows: By setting up a lignite wax extraction unit between the lignite bunker and the humic acid production unit, this utility model can extract lignite wax before producing humic acid, thereby separating the raw material from the lignite wax. This ensures the quality of the humic acid product, avoids the problem of lignite wax clogging related pipelines during the re-dissolution of humic acid products, and prevents inconvenience in the compounding of water-soluble fertilizers, thus improving the user experience. Furthermore, this utility model can also achieve the characteristic of producing the by-product lignite wax, which can be used to make carbon paper, shoe polish, floor wax, polishing wax, metal polishing agent, etc. It is also used in medium-temperature mold materials for investment casting, as well as in leather finishing, electrical insulation, etc., thereby increasing the company's profits.

[0007] Preferably, the lignite wax extraction unit includes a lignite leaching tank, the top of which is equipped with a leaching agent replenishment pipe with a valve, and the bottom of the lignite leaching tank is connected to a lignite wax centrifuge.

[0008] Preferably, the lignite wax purification unit includes a distillation buffer tank connected to the liquid phase outlet of the lignite wax centrifuge, the outlet of the distillation buffer tank is connected to the inlet of the distillation column, and the liquid phase outlet of the distillation column is connected to the lignite wax finished product tank through a cooling and drying section.

[0009] Preferably, the humic acid production unit includes a continuous vacuum dryer / desolvent remover connected to the solid phase outlet of the lignite wax centrifuge, and the solid phase outlet of the continuous vacuum dryer / desolvent remover is connected to the humic acid separation and purification section and the humic acid finished product tank.

[0010] Preferably, the leaching agent recycling unit includes a liquid phase outlet of a continuous vacuum dryer connected to the inlet of a distillation buffer tank, and a gas phase outlet of a distillation column connected to the reflux port of a lignite leaching tank.

[0011] Preferably, the cooling and drying section includes a condenser connected to the liquid phase outlet of the distillation tower, and the outlet of the condenser is connected to the lignite wax product tank via a concentrator and a drum dryer.

[0012] Preferably, the humic acid separation and purification unit includes a reaction vessel connected to the solid phase outlet of a continuous vacuum dryer, the outlet of the reaction vessel connected to the inlet of a humic acid centrifuge, and the liquid phase outlet of the humic acid centrifuge connected to a humic acid finished product tank via a multi-effect evaporator and a spray dryer.

[0013] Preferably, the solid phase outlet of the humic acid centrifuge is connected to a paddle dryer, and the outlet of the paddle dryer is connected to a humic acid sludge collection tank.

[0014] A device for producing humic acid from lignite, manufactured according to the above technical solution, achieves the separation of lignite wax at the raw material stage by setting a lignite wax extraction unit between the lignite silo and the humic acid production unit. This ensures the quality of the humic acid product without altering the traditional humic acid production unit. A lignite wax purification unit further purifies the lignite wax, resulting in the production of by-products and increased enterprise profits. This invention employs a leaching agent recycling unit, which recovers the leaching agent from the lignite wax purification unit and the humic acid production unit, returning it to the lignite wax extraction unit to reduce production costs and improve the purity of humic acid and lignite wax products. The device features a reasonable design, effectively reducing the lignite wax content in the humic acid product, preventing blockage of related water-soluble fertilizer pipelines, facilitating the compounding of water-soluble fertilizers, and simultaneously producing lignite wax for external sale, thereby increasing enterprise profits. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] In the diagram: 1. Rod mill; 2. Lignite leaching tank; 3. Distillation tower; 4. Condenser; 5. Concentrator; 6. Drum dryer; 7. Distillation buffer tank; 8. Reactor; 9. Multi-effect evaporator; 10. Spray dryer; 11. Paddle dryer; 12. Humic acid centrifuge; 13. Lignite wax centrifuge; 14. Lignite wax finished product tank; 15. Humic acid slag collection tank; 16. Humic acid finished product tank; 17. Continuous vacuum dryer and solvent remover; 18. Lignite silo; 19. Leaching agent replenishment pipeline. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0019] The following is in conjunction with the appendix Figure 1To further describe this application in detail, this utility model is an apparatus for producing humic acid from lignite, comprising a lignite silo 18, which is connected to a lignite wax extraction unit via a rod mill 1. The liquid phase of the lignite wax extraction unit is connected to a lignite wax purification unit, and the solid phase of the lignite wax extraction unit is connected to a humic acid production unit. The lignite wax purification unit and the humic acid production unit together with the lignite wax extraction unit constitute a leaching agent recycling unit. The end of the lignite wax purification unit is connected to a lignite wax finished product tank 14, and the end of the humic acid production unit is connected to a humic acid finished product tank 16. This invention, based on the existing humic acid production process, incorporates lignite wax extraction technology as a pre-reaction step in the raw coal processing of humic acid. With the same raw material input, it not only yields humic acid but also produces lignite wax as a byproduct, improving lignite utilization and solving the problem of lignite wax's influence on the finished humic acid product. This significantly reduces the lignite wax content in the produced humic acid product. Simultaneously, the production of lignite wax increases lignite utilization, enhancing the added value of the product and thus improving enterprise profits. Furthermore, this invention includes a leaching agent recycling unit, further improving leaching agent utilization and reducing costs.

[0020] Furthermore, the lignite wax extraction unit includes a lignite leaching tank 2, with a leaching agent inlet pipe 19 equipped with a valve at the top of the lignite leaching tank 2, and the bottom of the lignite leaching tank 2 connected to a lignite wax centrifuge 13. This invention extracts lignite wax from the raw material using a leaching agent in the lignite leaching tank 2, and the extracted material is then centrifuged in the lignite wax centrifuge 13.

[0021] Furthermore, the lignite wax purification unit includes a distillation buffer tank 7 connected to the liquid phase outlet of the lignite wax centrifuge 13. The outlet of the distillation buffer tank 7 is connected to the inlet of the distillation column 3, and the liquid phase outlet of the distillation column 3 is connected to the lignite wax finished product tank 14 via a cooling and drying section. The liquid phase after centrifugation by the lignite wax centrifuge 13 consists of the leaching agent and lignite wax. The liquid phase enters the distillation buffer tank 7 for temporary storage. The temporarily stored liquid phase enters the distillation column 3 for distillation treatment. The purified liquid phase is further purified by the cooling and drying section and then stored in the lignite wax finished product tank 14 for sale.

[0022] Furthermore, the humic acid production unit includes a continuous vacuum drying desolventizer 17 connected to the solid phase outlet of the lignite wax centrifuge 13. The solid phase outlet of the continuous vacuum drying desolventizer 17 is connected to the humic acid separation and purification section and the humic acid finished product tank 16. The solid phase after centrifugation by the lignite wax centrifuge 13 is lignite after the lignite wax has been removed. By setting up the continuous vacuum drying desolventizer 17, the leaching agent adhering to the lignite can be removed, thereby ensuring the quality of the humic acid product.

[0023] Furthermore, the leaching agent recycling unit includes a liquid phase outlet of the continuous vacuum dryer / desolvent remover 17 connected to the inlet of the distillation buffer tank 7, and a gas phase outlet of the distillation column 3 connected to the reflux port of the lignite leaching tank 2. In this invention, the leaching agent recycling unit utilizes the leaching agent, after impurity removal in the continuous vacuum dryer / desolvent remover 17, to flow back into the distillation buffer tank 7 and then into the distillation column 3 for distillation. The distilled gas phase flows back into the lignite leaching tank 2 to maximize the recovery of the leaching agent, thereby achieving full utilization of the leaching agent and reducing operating costs.

[0024] Furthermore, the cooling and drying section includes a condenser 4 connected to the liquid phase outlet of the distillation column 3. The outlet of the condenser is connected to the lignite wax product tank 14 via a concentrator 5 and a drum dryer 6. This invention allows the liquid phase from the distillation column 3 to enter the condenser 4 for condensation, and then be sent to the concentrator 5 for concentration and the drum dryer 6 for drying, ultimately obtaining the lignite wax product.

[0025] Furthermore, the humic acid separation and purification unit includes a reaction vessel 8 connected to the solid phase outlet of the continuous vacuum dryer 17, the outlet of the reaction vessel 8 being connected to the inlet of the humic acid centrifuge 12, and the liquid phase outlet of the humic acid centrifuge 12 being connected to the humic acid finished product tank 16 via a multi-effect evaporator 9 and a spray dryer 10.

[0026] Furthermore, the solid phase outlet of the humic acid centrifuge 12 is connected to the paddle dryer 11, and the outlet of the paddle dryer 11 is connected to the humic acid slag collection tank 15.

[0027] The specific working process of this utility model is as follows: Lignite raw material enters the rod mill 1 through lignite bin 18 for crushing and grinding with water to become coal slurry. The coal slurry enters the lignite leaching tank 2. After extraction, the lignite slurry undergoes solid-liquid separation in the lignite wax centrifuge 13. The separated liquid phase enters the distillation buffer tank 7. When there is enough mixed liquid in the distillation buffer tank 7, the distillation tower 3 is turned on for fractionation. The fractionated leaching agent is returned to the lignite leaching tank 2 for reuse. The fractionated crude lignite wax is cooled and condensed by the condenser 4, and then enters the concentrator 5 for concentration. Finally, the lignite wax purified by condensation and concentration is dried in the drum dryer 6 to obtain the finished lignite wax, which is stored in the lignite wax finished product tank 14 for sale.

[0028] The solid phase after lignite wax removal by the lignite wax centrifuge 13 is then subjected to a continuous vacuum dryer and solvent remover 17 to remove residual solvent before entering the reaction vessel 8. The aforementioned residual solvent enters the distillation buffer tank 7, undergoes fractionation with the distillation column 3, and is then recycled into the lignite leaching tank 2. The solid phase is then added to the reaction vessel 8 with water and a strong alkali (NaOH, KOH) for humic acid extraction. The resulting solid-liquid mixture is centrifuged in the humic acid centrifuge 12 for separation. The centrifuged liquid phase is concentrated in the multi-effect evaporator 9, and the concentrated humic acid liquid is then dried in the spray dryer 10. The final product, humic acid granules, is obtained by drying and stored in the humic acid finished product tank 16 for sale. The solid phase after centrifugal separation is dried by the paddle dryer 11 to obtain humic acid residue, which is stored in the humic acid residue collection tank 15. This invention integrates the lignite wax extraction process into the front end of humic acid production as a raw material processing step, and uses grinding, leaching, concentration, and drying to prepare the byproduct lignite wax, improving the utilization rate of raw materials. At the same time, the production process of humic acid products utilizes centrifugation, multi-effect concentration, spray drying, and paddle drying technology for residue treatment to standardize and automate the production of humic acid. The above working method not only solves the problem of traditional humic acid products containing a large amount of lignite wax causing blockage of corresponding pipelines and waste of lignite wax, but also has the advantages of reasonable process design, effectively reducing the content of lignite wax in humic acid products, and improving the user experience of water-soluble fertilizers.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An apparatus for producing humic acid from lignite, comprising a lignite bin (18), characterized in that: The lignite bin (18) is connected with the lignite wax extraction unit through the rod mill (1), the liquid phase of the lignite wax extraction unit is connected with the lignite wax purification unit, and the solid phase of the lignite wax extraction unit is connected with the humic acid production unit, The lignite wax purification unit and the humic acid production unit form a leaching agent recycling unit with the lignite wax extraction unit. The end of the lignite wax purification unit is connected with the lignite wax product tank (14), and the end of the humic acid production unit is connected with the humic acid product tank (16).

2. The device for producing humic acid from lignite according to claim 1, characterized in that: The lignite wax extraction unit comprises a lignite leaching tank (2), the top of the lignite leaching tank (2) is provided with a leaching agent supplement pipeline (19) with a valve, and the bottom of the lignite leaching tank (2) is connected with a lignite wax centrifuge (13).

3. The device for producing humic acid from lignite according to claim 2, characterized in that: The lignite wax purification unit comprises a distillation buffer tank (7) connected with the liquid phase outlet of the lignite wax centrifuge (13), the outlet of the distillation buffer tank (7) is connected with the inlet of a distillation column (3), and the liquid phase outlet of the distillation column (3) is connected with the lignite wax product tank (14) through a cooling and drying part.

4. The device for producing humic acid from lignite according to claim 3, characterized in that: The humic acid production unit comprises a continuous vacuum drying desolventizer (17) connected with the solid phase outlet of the lignite wax centrifuge (13), and the solid phase outlet of the continuous vacuum drying desolventizer (17) is connected with a humic acid separation and purification part and the humic acid product tank (16).

5. The apparatus for producing humic acid from lignite according to claim 4, wherein: The leaching agent recycling unit comprises a liquid phase outlet of the continuous vacuum drying desolventizer (17) connected with the inlet of the distillation buffer tank (7), and a gas phase outlet of the distillation column (3) connected with a reflux port of the lignite leaching tank (2).

6. The device for producing humic acid from lignite according to claim 3, characterized in that: The cooling and drying part comprises a condenser (4) connected with the liquid phase outlet of the distillation column (3), and the outlet of the condenser is connected with the lignite wax product tank (14) through a concentrator (5) and a drum dryer (6).

7. The apparatus for producing humic acid from lignite according to claim 4, wherein: The humic acid separation and purification part comprises a reaction kettle (8) connected with the solid phase outlet of the continuous vacuum drying desolventizer (17), the outlet of the reaction kettle (8) is connected with the inlet of a humic acid centrifuge (12), and the liquid phase outlet of the humic acid centrifuge (12) is connected with the humic acid product tank (16) through a multi-effect evaporator (9) and a spray dryer (10).

8. The apparatus for producing humic acid from lignite according to claim 7, characterized in that: The solid phase outlet of the humic acid centrifuge (12) is connected with a paddle dryer (11), and the outlet of the paddle dryer (11) is connected with a humic acid residue collection tank (15).

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