A high-efficiency iron removal device for producing sodium pyrophosphate from glyphosate mother liquor

Abstract

This invention provides a high-efficiency iron removal device for producing sodium pyrophosphate from glyphosate mother liquor. The mother liquor tank is connected to the liquid phase interface of an atomizing gun via a mother liquor pump; a blower is connected to the gas phase interface of the atomizing gun; the atomizing gun is connected to an incinerator; a grate and a rotary feeder are installed at the lower level of the incinerator; the rotary feeder and a coarse crusher are both connected to a discharge scraper conveyor; the discharge scraper conveyor is connected to a fine crusher; the fine crusher is connected to an elevator; the elevator is connected to a slag cooler; the slag cooler is connected to a gyratory screen; the gyratory screen is connected to a silo; a strong magnetic separator is installed at the silo outlet and connected to a packaging machine. This invention combines gyratory screen screening and strong magnetic separator adsorption technologies to form an iron removal system, effectively solving the risk of small metal impurities entering the finished sodium pyrophosphate product, ensuring product quality from the source, and providing reliable technical support for process optimization in the production of sodium pyrophosphate from glyphosate mother liquor.

Description

Technical Field

[0001] This utility model relates to the field of production technology for producing sodium pyrophosphate from glyphosate mother liquor during the production process, specifically to a device for efficiently removing iron during the production of sodium pyrophosphate from glyphosate mother liquor. Background Technology

[0002] Glyphosate, a widely used herbicide, produces a mother liquor with high chemical oxygen demand (COD), high total phosphorus (TP), and high salinity, and its complex composition makes it difficult to degrade. Existing processing methods employ multi-stage membrane separation to separate phosphate and sodium salts from the mother liquor. The phosphates are then concentrated and atomized before being incinerated in a natural gas incinerator to convert them into crude sodium pyrophosphate. As customer requirements for sodium pyrophosphate quality continue to rise, foreign matter in the crude sodium pyrophosphate, such as iron lumps and iron filings, has become increasingly prominent. This problem is primarily caused by the grate drive system in the incinerator. Directional conversion in incinerators requires a high-temperature environment, typically 600-800 degrees Celsius. When clumped materials cause obstruction, the grate scales deform and fall off. Furthermore, the large scales used in large grates, with their numerous scales, are easily mixed into the product after falling scales during operation and undergoing coarse and fine crushing, posing a quality risk. Therefore, developing an efficient iron removal device is of great significance for improving product quality and promoting technological progress in the glyphosate mother liquor recovery and sodium pyrophosphate production industry. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a device for efficient iron removal in the production of sodium pyrophosphate from glyphosate mother liquor. The technical solution adopted is as follows: the mother liquor tank is connected to the liquid phase interface of an atomizing gun via a mother liquor pump; a blower is connected to the gas phase interface of the atomizing gun; the atomizing gun is connected to an incinerator; the incinerator contains distributed combustion guns; the blower is connected to the lower layer of the incinerator; the lower layer of the incinerator is equipped with a grate and a rotary feeder; the incinerator outlet is connected to a coarse crusher; both the rotary feeder and the coarse crusher are connected to a discharge scraper conveyor; the incinerator gas phase inlet is connected to a high-temperature cyclone separator; the lower rotary feeder of the high-temperature cyclone separator is connected to the discharge scraper conveyor; the upper part of the high-temperature cyclone separator is connected to a rear-end waste heat utilization device. The discharge scraper conveyor is connected to a fine crusher; the fine crusher is connected to an elevator; the elevator is connected to a slag cooler; the slag cooler is connected to a gyratory screen; the gyratory screen is connected to a silo; a strong magnetic separator is installed at the silo outlet and connected to a packaging machine.

[0004] In a preferred embodiment, the atomizing gun mixes the mother liquor using the air pressure of a blower and the hydraulic pressure of a mother liquor pump to atomize the mother liquor. The atomizing gun can be set according to the processing capacity, and the delivery capacity of a single atomizing gun is generally 1-2 m³ / h.

[0005] In the preferred embodiment, the incinerator and high-temperature cyclone are coated with a casting material. The thickness of the casting material coating is designed according to the temperature required by the process, and is generally set at 10-20cm.

[0006] In a preferred embodiment, the number of layers of the combustion guns is set according to the height of the furnace, with two guns set in each layer and four to six guns set in the bottom layer.

[0007] In a preferred embodiment, the grate consists of a main drive shaft and a driven drive shaft, assembled using 10-20# I-beams. The outer ring is fastened with fasteners to assemble the steel components together, which move with the drive shaft. The size of the fasteners is set according to the scale plates. The upper surface of the I-beam is composed of scale plates, with 50-100 plates forming a small horizontal surface. The grate consists of n small horizontal surfaces, where n is determined by the length L of the grate. For example, 2578×330\310S scale plates are used for arrangement. At the same time, the shaft rotation speed is determined based on the time the material stays at the bottom layer.

[0008] In a preferred embodiment, the specific number of the star-shaped feeders is determined by the length L of the grate. In a preferred embodiment, both the discharge scraper and the slag cooler are equipped with cooling devices, using circulating water or other water to cool the internal materials. In a preferred embodiment, the gyratory screen can be a ball-type gyratory screen driven by a motor for screening; or an ultrasonic gyratory screen can be used for screening through vibration; the internal screen mesh can be set to 16-20 mesh. As a preferred embodiment, the strong magnetic separator 17 can adopt a magnetic force of 0.3-1.0 Tesla and be equipped with a pull-out structure. It can be set up in two sets for easy daily disassembly and replacement to ensure efficient iron removal.

[0009] The beneficial effects of this utility model are as follows: This invention combines two technologies—oscillating screen and strong magnetic separator—to form an iron removal system. This system effectively addresses the risk of small metal impurities entering the finished sodium pyrophosphate product, ensuring product quality from the source and providing reliable technical support for optimizing the process of producing sodium pyrophosphate from glyphosate mother liquor. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a high-efficiency iron removal device for producing sodium pyrophosphate from glyphosate mother liquor. The device includes: mother liquor tank 1, mother liquor pump 2, atomizing gun 3, incinerator 4, combustion gun 5, high-temperature cyclone separator 6, blower 7, grate 8, star feeder 9, coarse crusher 10, discharge scraper 11, fine crusher 12, elevator 13, slag cooler 14, gyratory screen 15, silo 16, strong magnetic separator 17, and packaging machine 18. Detailed Implementation

[0011] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0012] Example 1 A high-efficiency iron removal device for producing sodium pyrophosphate from glyphosate mother liquor, such as Figure 1 As shown, the mother liquor tank 1 is connected to the liquid phase interface of the atomizing gun 3 via the mother liquor pump 2, the blower 7 (G1-2) is connected to the gas phase interface of the atomizing gun 3, the atomizing gun 3 is connected to the incinerator 4, the incinerator is equipped with the combustion gun 5 (Q1-12), the blower 7 (G3-4) is connected to the lower layer of the incinerator 4, the lower layer of the incinerator 4 is equipped with the grate 8 and the star feeder 9 (X1-4), the discharge port of the incinerator 4 is connected to the coarse crusher 10, and both the star feeder 9 (X1-4) and the coarse crusher 10 are connected to the discharge scraper 11; the gas phase port of the incinerator 4 is connected to the high temperature cyclone separator 6, the lower part of the high temperature cyclone separator 6 is connected to the discharge scraper 11, and the upper part of the high temperature cyclone separator 6 is connected to the rear waste heat utilization device. The discharge scraper 11 is connected to the fine crusher 12, the fine crusher 12 is connected to the elevator 13, the elevator 13 is connected to the slag cooler 14, the slag cooler 14 is connected to the gyratory screen 15, the gyratory screen 15 is connected to the hopper 16, and the outlet of the hopper 16 is equipped with a strong magnetic separator 17, which is connected to the packaging machine 18.

[0013] Blower 7 (G1-2) refers to the first blower and the second blower in the parallel connection.

[0014] Blower 7 (G3-4) refers to the third and fourth blowers in a parallel configuration.

[0015] Combustion gun 5 (Q1-12) refers to the first to the 12th combustion guns in a row of combustion gun rods.

[0016] Star feeder 9 (X1-4) refers to the first and fourth star feeders in the parallel star feeder system.

[0017] Furthermore, the atomizing gun 3 is mixed by the air pressure of the blower 7 (G1-2) and the hydraulic pressure of the mother liquor pump 2 to atomize the mother liquor. The atomizing gun 3 can be set according to the processing volume. Generally, the delivery volume of a single atomizing gun is 1-2 m³ / h.

[0018] Furthermore, the incinerator 4 and the high-temperature cyclone 6 are coated with castable refractory. The thickness of the castable refractory coating is designed according to the temperature required by the process, and is generally set at 10-20cm.

[0019] Furthermore, the number of layers of the combustion gun 5 (Q1-12) is set according to the height of the furnace, with two guns set in each layer and four guns set in the bottom layer.

[0020] Furthermore, the grate 8 consists of a main drive shaft and a driven drive shaft, assembled using 10-20# I-beams. The outer ring is assembled with fasteners, the size of which is set according to the scale plates. The upper surface of the I-beam is composed of scale plates, with 50-100 plates forming a small horizontal surface. The grate consists of n small horizontal surfaces, where n is determined by the length L of the grate. For example, scale plates of type 2578×330\310S are used for arrangement. At the same time, the shaft rotation speed is determined according to the time the material stays at the bottom layer.

[0021] Furthermore, the specific number of the star-shaped feeders 9 (X1-4) is determined by the length L of the grate.

[0022] Furthermore, both the discharge scraper conveyor 11 and the slag cooler 14 are equipped with cooling devices, using circulating water or other water to cool the internal materials.

[0023] Furthermore, the swing screen 15 is an ultrasonic swing screen that performs sieving through vibration; the internal screen mesh can be set to 16-20 mesh.

[0024] Furthermore, the strong magnetic separator 17 can adopt a magnetic force of 0.3-1.0 Tesla and is equipped with a pull-out structure, with two sets available for easy daily disassembly and replacement to ensure efficient iron removal.

[0025] Example 2 As shown in the figure, the working principle of this embodiment is as follows: During operation, blowers 7 (G3-4) first blow air into the incinerator 4, igniting the combustion guns 5 (Q1-16) at each level, raising the furnace temperature to the required process temperature (600-800℃). Then, the highly concentrated phosphorus mother liquor in the mother liquor tank 1 is pumped by the mother liquor pump 2 to the liquid phase interface of the atomizing gun 3 at the top of the incinerator. Blowers 7 (G1-2) deliver air to the gas phase interface of the atomizing gun 3, and the mother liquor is vaporized by the atomizing gun 3 and enters the incinerator. The mother liquor reacts with oxygen in the furnace air at high temperature, transforming into crude sodium coke. At this point, the powder falls onto the grate 8 due to gravity. The high-temperature gas and sodium coke powder in the furnace enter the high-temperature cyclone 6, where the sodium coke in the hot gas is intercepted and discharged to the discharge scraper by the star-shaped feeder 9 (X5). The waste heat is then sent to the downstream processing device for waste heat recovery.

[0026] The sodium coke that falls onto grate 8 is conveyed to coarse crusher 10 via the grate drive. Coarse crusher 10 crushes the large pieces of material and then feeds them into discharge scraper conveyor 11. At the same time, the new type of feeder 9 (X1-4) places the sodium coke that falls from grate 8 into discharge scraper conveyor 11. Discharge scraper conveyor 11 further crushes the sodium coke that has been conveyed to fine crusher 12, and then the material is conveyed by elevator 13 to slag cooler 14 for cooling. The cooled sodium coke then enters gyratory screen 15. Gyratory screen 15 is driven by a motor to rotate the pulley, causing the screen box to swing in an approximately circular motion. The material then undergoes directional rolling motion to achieve screening. Large pieces of residue are collected separately, while fine sodium coke enters silo 16 for buffering. After buffering, it enters packaging machine 18. A strong magnetic separator 17 is installed on the connecting pipe to adsorb powdery and small-particle iron impurities. By screening large pieces and adsorbing iron impurities, efficient iron removal is achieved to obtain high-quality sodium coke product.

[0027] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A high-efficiency iron removal device for producing sodium pyrophosphate from glyphosate mother liquor, characterized in that, The mother liquor tank (1) is connected to the liquid phase interface of the atomizing gun (3) via the mother liquor pump (2); The blower (7) is connected to the gas phase interface of the atomizing gun (3); The atomizing gun (3) is connected to the incinerator (4); The lower layer of the incinerator (4) is equipped with a grate (8) and a star feeder (9); The star-shaped feeder (9) and the coarse crusher (10) are both connected to the discharge scraper conveyor (11); The discharge scraper (11) is connected to the fine crusher (12), the fine crusher (12) is connected to the elevator (13), the elevator (13) is connected to the slag cooler (14), the slag cooler (14) is connected to the gyratory screen (15), the gyratory screen (15) is connected to the silo (16), and a strong magnetic separator (17) is installed at the outlet of the silo (16) and connected to the packaging machine (18).

2. The device for efficiently removing iron from glyphosate mother liquor to produce sodium pyrophosphate according to claim 1, characterized in that: The incinerator (4) contains multiple combustion guns (5), and the discharge port of the incinerator (4) is connected to the coarse crusher (10).

3. The device for efficiently removing iron from glyphosate mother liquor to produce sodium pyrophosphate according to claim 2, characterized in that: Burning gun (5): Set the number of layers of burning guns according to the height of the furnace. Set two guns for each layer and four to six guns for the bottom layer.

4. The device for efficiently removing iron from glyphosate mother liquor to produce sodium pyrophosphate according to claim 1, characterized in that: The gas phase inlet of the incinerator (4) is connected to the high-temperature cyclone separator (6), the lower part of the high-temperature cyclone separator (6) is connected to the discharge scraper (11), and the upper part of the high-temperature cyclone separator (6) is connected to the waste heat utilization device at the rear end.

5. The device for efficiently removing iron from glyphosate mother liquor to produce sodium pyrophosphate according to claim 1, characterized in that: The blower (7) is connected to the lower part of the incinerator (4).

6. The device for efficiently removing iron from glyphosate mother liquor to produce sodium pyrophosphate according to claim 1, characterized in that: The grate (8) consists of a main drive shaft and a driven drive shaft, and is assembled using 10-20# I-beams. The outer ring is assembled with fasteners to move with the drive shaft. The size of the fasteners is set according to the scale plates. The upper surface of the I-beam is composed of scale plates, with 50-100 plates forming a small horizontal surface. The grate is composed of n small horizontal surfaces, where n is determined by the length L of the grate.

7. The device for efficiently removing iron from glyphosate mother liquor to produce sodium pyrophosphate according to claim 1, characterized in that: The gyratory screen (15) is a ball-jumping gyratory screen or an ultrasonic gyratory screen that performs sieving by vibration; the internal screen is set with a mesh size of 16-20.

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