A high-concentration mother liquor treatment device and treatment method

Abstract

The present invention discloses a high-concentration mother liquor treatment device and treatment method, including: a primary feed tank, a secondary feed tank and a tray rotary dryer arranged in sequence along the mother liquor treatment direction; the mother liquor in the primary feed tank overflows to the secondary feed tank, and then enters the distribution pipe of the tray rotary dryer for distribution, and sprays the high-concentration mother liquor on the outer wall of the rotary drum; steam is introduced into the rotary drum for inter-wall heat transfer with the high-concentration mother liquor on the outer wall of the rotary drum; the tray under the rotary drum is used to collect the mother liquor that is not distributed on the rotary drum, and enters the primary feed tank or the secondary feed tank through the mother liquor reflux pipeline; the condensed water generated after the steam heat exchange in the rotary drum enters the condensed water tank, and the secondary gas generated after the mother liquor heat exchange outside the rotary drum passes through the bag filter and the induced draft fan in sequence. The present invention evaporates and dries the mother liquor into miscellaneous salts for resource utilization, and the secondary gas generated is also treated for standard discharge, thereby achieving true "zero" wastewater discharge.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a high-concentration mother liquor treatment device and a treatment method. Background Art

[0002] At present, most factories use "zero emission" technology for wastewater treatment. Through front-end pretreatment, dosing, high density, biochemical, membrane treatment and other processes, COD, ammonia nitrogen and other substances in wastewater are removed, and salt ions and water molecules are separated according to the principle of osmotic difference to obtain recycled water that meets the discharge standards, while the part with high salt content enters the evaporation and crystallization system for further reduction treatment. However, since the wastewater has been enriched in the evaporator, in order to ensure the stable operation of the evaporation system, a part of the mother liquor must be discharged. Because this part of the mother liquor has the characteristics of high salt content, high COD, high ammonia nitrogen, etc., the disposal of high-concentration mother liquor has become a difficult problem in the last step. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a high-concentration mother liquor treatment device and method, which evaporates and dries the mother liquor into impure salts for resource utilization. During operation, the solid particles in the feed are isolated by a double feed tank to ensure the stable operation of the system. The secondary gas generated is also treated and discharged in compliance with the standards, thereby achieving true "zero" wastewater discharge.

[0004] The invention discloses a high-concentration mother liquor processing device, comprising: a primary feed tank, a secondary feed tank and a tray rotary drum dryer which are sequentially arranged along the mother liquor processing direction;

[0005] The overflow port of the primary feed tank is connected to the feed port of the secondary feed tank, and the discharge port of the secondary feed tank is connected to the distribution pipe of the tray rotary dryer through a feed pump and a feed pipeline;

[0006] The tray rotary drum dryer is provided with a rotary drum and a tray inside, and the distribution pipe is provided with a nozzle for spraying high-concentration mother liquor on the outer wall of the rotary drum; steam is introduced into the rotary drum for inter-wall heat transfer with the high-concentration mother liquor on the outer wall of the rotary drum; the tray is used to collect the mother liquor that is not distributed on the rotary drum and enter the primary feed tank or the secondary feed tank through the mother liquor reflux pipeline;

[0007] The condensed water generated after the steam heat exchange in the drum enters the condensed water tank, and the secondary gas generated after the mother liquid heat exchange outside the drum enters the bag filter through the secondary gas pipeline for dust removal, and then is discharged through the induced draft fan.

[0008] As a further improvement of the present invention, the outer walls of the primary feed tank and the secondary feed tank are both provided with jackets, the distribution pipe is provided with a feed flushing port, and the tray is provided with a tray flushing port; the condensed water of the condensate tank is transported to two parallel jacket pipes, one feed flushing pipe and one tray flushing pipe through a condensate pump; the two jacket pipes are respectively connected to the jackets of the primary feed tank and the secondary feed tank, for heating or keeping the mother liquor in the tanks warm; one feed flushing pipe is connected to the feed flushing port, for flushing the distribution pipe and the nozzle; one tray flushing pipe is connected to the tray flushing port, for flushing the tray.

[0009] Furthermore, the condensed water in the condensed water tank is also transported to the front-end preheating pipeline through the condensed water pump to preheat the material before entering the primary feed tank.

[0010] As a further improvement of the present invention, the overflow port of the primary feed tank serves as the discharge port of the primary feed tank, the feed port of the primary feed tank extends into the tank body and is lower than the overflow port, and the terminal end of the feed port of the primary feed tank is an expanded section.

[0011] As a further improvement of the present invention, the primary feed tank and the secondary feed tank are of upper cylinder and lower cone structure, and hand holes are provided at the bottom of the primary feed tank and the secondary feed tank; a flushing water outlet is provided at the top of the primary feed tank, and a secondary feed tank agitator is provided in the secondary feed tank.

[0012] As a further improvement of the present invention, the secondary feed tank agitator is a paddle agitator, and the feed pump is a plunger pump.

[0013] As a further improvement of the present invention, the distribution pipe is arranged obliquely above the drum, and the nozzle of the distribution pipe semi-atomizes the mother liquid and sprays it onto the surface of the drum to form a uniform film, and steam is passed inside the drum to indirectly heat the material.

[0014] As a further improvement of the present invention, the tray drum dryer is divided into two structures, open and closed, according to whether the material contains pungent odor. If it is set to a closed type, a push-pull window is provided on the side for observing the operation of the tray drum dryer and scraper unloading.

[0015] As a further improvement of the present invention, the tray is semi-cylindrical, with both ends being longer than the rotating drum so as to form a half wrapping of the rotating drum.

[0016] As a further improvement of the present invention, the tray is installed at a certain angle, and a pipe opening is opened at the connection between the lowest point and the outer shell of the tray rotary dryer, so that the fallen mother liquor does not accumulate on the tray but flows out directly from the pipe opening; the mother liquor flowing out from the pipe opening enters the primary feed tank or the secondary feed tank through the mother liquor reflux pipe.

[0017] The present invention also discloses a method for treating a high-concentration mother liquor, comprising:

[0018] The high-concentration mother liquor enters the primary feed tank for buffering, and then overflows into the secondary feed tank;

[0019] After the secondary feed tank is fed, stirring is started, and the mother liquor in the secondary feed tank is transported to the tray drum dryer through the feed pump and the feed pipeline;

[0020] The mother liquid is sprayed onto the surface of the drum after being semi-atomized by the distribution pipe and nozzle of the tray drum dryer, forming a uniform film. Steam is passed inside the drum to indirectly heat the material.

[0021] The condensed water after steam condensation is discharged into the condensate tank and transported to various water use points by the condensate pump for reuse;

[0022] The secondary gas generated during the mother liquor drying process is discharged to the bag filter for particle removal, and the gas that meets the standards is discharged outdoors by the induced draft fan;

[0023] The dried solid salt is scraped and sent to the packaging machine for bulk bagging.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The device of the present invention has a compact structure, a high degree of automatic control, simple and reliable operation, low energy consumption, and strong versatility; the present invention effectively prevents the clogging of the feed pipe and the nozzle through the design of double feed tanks; the present invention prevents liquid accumulation inside the drum and crystallization through the arrangement of a tray, prevents clogging, and facilitates cleaning; the present invention can achieve efficient treatment of evaporated high-concentration mother liquor, and the generated condensed water can be recycled, thereby saving energy and reducing consumption, and the secondary gas can achieve standard discharge, beautify the environment, and prevent environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a high-concentration mother liquor treatment device disclosed in an embodiment of the present invention;

[0027] Figure 2 for Figure 1 Front structural diagram of the middle tray drum dryer;

[0028] Figure 3 for Figure 1 Schematic diagram of the side structure of the medium tray rotary dryer.

[0029] In the figure:

[0030] 1. Primary feed tank; 2. Secondary feed tank; 3. Secondary feed tank agitator; 4. Feed pump; 5. Tray drum dryer; 51. Distribution pipe; 52. Drum; 53. Tray; 54. Feed flushing port; 55. Tray flushing port; 56. Window; 57. Salt discharge port; 6. Bag filter; 7. Induced draft fan; 8. Condensate tank; 9. Condensate pump; 10. Overflow pipe; 11. Feed pipe; 12. Mother liquor reflux pipe; 13. Jacket pipe; 14. Feed flushing pipe; 15. Tray flushing pipe; 16. Front end preheating pipe; 17. Secondary air pipe. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0035] like Figure 1As shown, the present invention provides a high-concentration mother liquor processing device, comprising: a primary feed tank 1, a secondary feed tank 2, a secondary feed tank agitator 3, a feed pump 4, a tray drum dryer 5, a bag filter 6, an induced draft fan 7, a steam condensate tank 8, a condensate pump 9, an overflow pipe 10, a feed pipe 11, a mother liquor reflux pipe 12, a jacket pipe 13, a feed flushing pipe 14, a tray flushing pipe 15, a front end preheating pipe 16 and a secondary gas pipe 17; wherein,

[0036] The one-time feed tank 1 of the present invention is used as a temporary storage tank for the front-end high-concentration mother liquor, and is installed in a layer. The feed port of the one-time feed tank 1 is connected to the front-end incoming material pipeline. The feed port of the one-time feed tank 1 extends into the tank body, and the terminal of the pipe mouth of the feed port is an expanded section, which forms a water-dispersing effect; on the one hand, it ensures that the mother liquor entering the one-time feed tank 1 is below the overflow port, and on the other hand, it slows down the discharge flow rate, increases the sinking time of very few solid particles, and allows more tiny particles to settle to the bottom of the tank. The one-time feed tank 1 is an upper tube and lower cone structure, and it increases the bottom space. The bottom of the one-time feed tank 1 is provided with a hand hole for cleaning the solid particles deposited at the bottom of the one-time feed tank 1; the outer wall of the one-time feed tank 1 is provided with a jacket, and the mother liquor in the tank is heated and insulated by the jacket to prevent the mother liquor from cooling down and further precipitating crystalline salt. If necessary, the mother liquor can also be heated to increase the solubility; the top of the one-time feed tank 1 is provided with a flushing water outlet, which is convenient for flushing the one-time feed tank 1 during operation.

[0037] The secondary feed tank 2 of the present invention is used as a feed tank of the rotary dryer, installed in a layer, slightly lower than the primary feed tank 1, and the overflow pipe 10 connects the overflow port of the primary feed tank 1 (the overflow port serves as the discharge port of the primary feed tank 1) and the feed port of the secondary feed tank 2. The secondary feed tank 2 is an upper cylinder and lower cone structure, and its bottom space is increased. The tank bottom of the secondary feed tank 2 is provided with a hand hole, which is used to clean the solid particles deposited at the bottom of the secondary feed tank 2; the outer wall of the secondary feed tank 2 is provided with a jacket, and the mother liquid in the tank is heated and insulated by the jacket to prevent the mother liquid from cooling and further precipitating crystalline salts. If necessary, the mother liquid can be heated to increase the solubility; the top of the secondary feed tank 2 is provided with a flushing water outlet, which is convenient for flushing the secondary feed tank 2 during operation.

[0038] The secondary feed tank 2 of the present invention is provided with an agitator 3 to stir the mother liquor in the secondary feed tank so that the mother liquor generates a vortex in the secondary feed tank. The agitator 3 is mostly a paddle agitator. Compared with other forms of stirring, paddle stirring is more uniform and can more effectively reduce the precipitation of solid particles. At the same time, the paddle stirring is designed as a variable frequency form, which is convenient for the operator to remotely control.

[0039] The bottom outlet of the secondary feed tank 2 of the present invention is connected to the inlet of the feed pump 4, and the outlet of the feed pump 4 is connected to the feed inlet of the tray rotary dryer 5 through the feed pipe 11. Among them, the feed pump 4 adopts the form of a plunger pump. Compared with chemical pumps and ordinary centrifugal pumps, the plunger pump can provide higher pressure, which is convenient for gasification of high-concentration mother liquor, and the plunger pump is suitable for high-temperature saturated mother liquor.

[0040] The present invention adopts a double feed tank design in which the primary feed tank 1 overflows to the secondary feed tank 2, which can ensure that the mother liquor entering the subsequent tray rotary dryer 5 is minimized or even contains no solid particles, solves the problem that the material entering the dryer is easy to carry crystalline particles, prevents the feed nozzle of the tray rotary dryer from being blocked, and ensures the continuous and stable operation of the device. At the same time, the jacket design structure of the primary feed tank 1 and the secondary feed tank 2 eliminates the possibility of cooling and crystallization, and the jacket is supplemented with condensed water produced by the device, saving energy consumption.

[0041] like Figure 2 , 3 As shown, the interior of the tray rotary drum dryer 5 of the present invention is provided with a distribution pipe 51, a rotary drum 52, a tray 53 and a salt discharge port 57 from top to bottom. The distribution pipe 51 is connected to the feed pipe 11. The distribution pipe 51 is located obliquely above the rotary drum 52. A plurality of nozzles are evenly distributed on the distribution pipe 51 to ensure that the high-concentration mother liquor from the feed pump 4 can be sprayed on the entire surface of the rotary drum 52 through the distribution nozzle; wherein the number of nozzles can be calculated and determined based on the feed amount, nozzle angle, spraying coverage area, etc.; the opening size of the nozzle is used to make the incoming liquid as semi-atomized as possible while not causing blockage too frequently.

[0042] The material distribution pipe 51 of the tray rotary dryer 5 of the present invention is provided with a feed flushing port 54. When the pipe spraying is blocked or shut down, the pipe and the nozzle are flushed to maintain the stable operation of the system and ensure the normal startup and use of the machine next time.

[0043] The drum 52 of the tray drum dryer 5 of the present invention performs circular motion, and the drum 52 is provided with variable frequency speed regulation, so that the rotation speed of the drum can be adjusted conveniently on site according to the actual operating conditions.

[0044] The tray rotary drum dryer 5 of the present invention has a semi-cylindrical tray 53 at the bottom of the rotary drum 52, which half wraps the rotary drum 52 and is used to collect a small amount of mother liquid that is not distributed on the rotary drum 52 to prevent the mother liquid from falling into the bottom storage tank and evaporating under heat to produce crystallized salt accumulation.

[0045] The tray 53 of the tray rotary drum dryer 5 of the present invention is installed at a certain angle, and a pipe opening is opened at the lowest point connected to the dryer, so that the mother liquid that falls does not accumulate on the tray 53, but flows out directly from the pipe opening; the mother liquid flowing out from the pipe opening enters the secondary feed tank 2 through the mother liquid reflux pipe 12, so that it is transported back to the dryer for drying disposal.

[0046] A tray flushing port 55 is provided above the tray 53 of the tray rotary drum dryer 5 of the present invention. The flushing is controlled by a switch valve and is designed to be timed and automatic to prevent crystal residues on the tray 53 .

[0047] The tray drum dryer 5 of the present invention is divided into two structures, open type and closed type, according to the characteristics of whether the material contains pungent odor. If it is set to a closed type, a push-pull window 56 is provided on the side of the outer shell of the tray drum dryer 5, and the push-pull window 56 is flush with the outer shell; it is used to observe the operation status of the drum 52 such as cloth, drying, scraping, feeding, etc. and the operation status of the scraper unloading, and adjust the drum speed in time.

[0048] The tray rotary drum dryer 5 of the present invention has high-temperature steam passing through the drum 52, and heat is transferred between the drum 52 and the mother liquid wall outside the drum 52, so that the heat transfer is fast and efficient, and the cylindrical drum design makes the mother liquid heated more evenly. The tray rotary drum dryer of the present invention is provided with a condensate collector connected to the drum 52. After the steam exchanges heat with the mother liquid, the condensate is collected by the condensate collector and discharged to the steam condensate tank 8.

[0049] A flexible scraper and a spiral are arranged on one side of the tray drum dryer 5 of the present invention. The flexible scraper scrapes off the dried solid salt on the drum and discharges it through the feeding spiral of the salt discharge port 57, and is packed into ton bags by a ton bag packaging machine.

[0050] The secondary gas generated by drying the mother liquid in the tray drum dryer 5 of the present invention is discharged to the bag filter 6 through the secondary gas pipeline 17. The secondary gas is subjected to particle elimination in the bag filter 6, and the dust removal rate of the bag filter 6 can reach more than 95%; the gas discharged from the bag filter 6 that meets the national exhaust gas emission standards is drawn out by the induced draft fan 7 and piped to be discharged outdoors. Furthermore, the air passing parts of the bag filter 6 are made of 316L material to ensure that they can withstand the corrosiveness of the particles carried by the secondary gas and ensure the service life of the equipment. Furthermore, a sewage outlet is provided at the bottom of the induced draft fan 7, and a flexible connection is provided at the interface of the induced draft duct. When a part of dust is accumulated in the induced draft fan 7 due to a long period of operation, the flexible connection can be removed, and the induced draft fan can be flushed with external flushing water, and the flushing water is directly discharged from the sewage outlet.

[0051] The condensed water in the steam condensate tank 8 of the present invention is transported by a condensate pump 9. The transported condensed water passes through two jacketed pipes 13, which go to the jackets of the primary feed tank 1 and the secondary feed tank 2 respectively, to heat and insulate the mother liquor in the primary feed tank 1 and the secondary feed tank 2, and the condensed water after heat exchange is recycled; the transported condensed water passes through a feed flushing pipe 14, which is connected to a feed flushing port 54 to flush the material distribution pipe 51 and the nozzle, and the high-temperature water flushing and plugging effect is better; the transported condensed water passes through a tray flushing pipe 15, which is connected to a tray flushing port 55 to flush the tray 53, and the high-temperature water flushing and plugging effect is better; the transported condensed water passes through a front-end preheating pipe 16 to preheat the material before entering the primary feed tank 1, thereby increasing the utilization rate of heat and saving energy consumption; wherein, when the condensed water in the condensate tank is not needed for flushing, it can be directly discharged to the front end to participate in the preheating of the material, thereby saving heat energy consumption.

[0052] According to a high-concentration mother liquor treatment device and method disclosed in the above embodiment, the use method thereof comprises the following steps:

[0053] 1) The high-concentration mother liquor from the front end is discharged into the primary feed tank 1 for buffering, and the liquid level gauge of the primary feed tank 1 is observed to ensure that the liquid level of the primary feed tank 1 is always in an overflow state;

[0054] 2) The overflow liquid of the primary feed tank 1 flows into the secondary feed tank 2 through the overflow pipe 10;

[0055] 3) Turn on the secondary feed tank agitator 3 to stir the mother liquid in the secondary feed tank 2, and regularly observe the liquid level in the tank to prevent the tank from overflowing;

[0056] 4) Turn on the tray drum dryer 5, open the steam valve, and let in steam;

[0057] 5) Open the pipeline valve from the secondary feed tank 2 to the feed pump 4, and then open the feed pump 4;

[0058] 6) The feed pump 4 delivers the high-concentration mother liquor to the distribution pipe of the tray drum dryer 5 through the feed pipe 11, and at the same time opens the valve of the mother liquor return pipe 12;

[0059] 7) Observe the operation status of the drum 52 such as material distribution, drying, scraping, feeding, etc. through the viewing window 56, and adjust the speed of the drum 52 in time;

[0060] 8) The condensed water generated by the tray drum dryer 5 is discharged to the condensed water tank 8 for buffering, and is transported to various water use points by the condensed water pump 9;

[0061] 9) Turn on the bag filter 6 and the induced draft fan 7 to timely extract, remove dust and discharge the secondary gas generated by the evaporation of the mother liquid;

[0062] 10) After shutdown, the condensate pump 9 delivers condensate to flush the material distribution pipe and tray of the tray rotary dryer 5.

[0063] The advantages of the present invention are:

[0064] 1. The present invention intercepts all the crystal particles that may be contained in the high-concentration mother liquor by designing a two-stage feed tank, effectively solving the problem of the material entering the dryer carrying crystal particles, so that the feed material nozzle will not be frequently blocked, ensuring the long-term stable operation of the device; the jacket design structure of the feed tank eliminates the possibility of cooling and crystallization; the structural transformation of the tray rotary dryer and the update and optimization of the feeding method make it so that there is no liquid accumulation in the bottom material tank, effectively solving the problem of the crystallization of the liquid in the bottom material tank that is difficult to clean. Therefore, the device of the present invention can efficiently and stably dispose of high-concentration mother liquor, solving the problem that high-concentration mother liquor cannot be properly disposed of in zero-emission or full-quantity treatment.

[0065] 2. The heating steam of the present invention condenses into condensed water when encountering cold materials. This part of condensed water is recycled so that the heat is recycled in the system, improving the heat utilization rate, greatly saving the system energy consumption, and saving energy and reducing emissions.

[0066] 3. The present invention is not only applicable to high-concentration mother liquors produced by various evaporation and crystallization processes, but also to various liquids with high viscosity and high concentration, and has high versatility and a wide range of applications.

[0067] 4. The present invention has a high degree of automation, is easy to operate, and greatly saves labor.

[0068] 5. The present invention does not discharge unqualified wastewater or unqualified waste gas, will not cause secondary pollution to the environment, and beautifies the environment.

[0069] 6. The present invention can be processed in an integrated manner as a complete skid-mounted system, which is overall simple and beautiful and occupies a compact area.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-concentration mother liquor treatment device, characterized in that: include: A primary feed tank, a secondary feed tank and a tray drum dryer are arranged in sequence along the mother liquor processing direction; The overflow port of the primary feed tank is connected to the feed port of the secondary feed tank, and the discharge port of the secondary feed tank is connected to the distribution pipe of the tray rotary dryer through a feed pump and a feed pipeline; The tray rotary drum dryer is provided with a rotary drum and a tray inside, and the distribution pipe is provided with a nozzle for spraying high-concentration mother liquor on the outer wall of the rotary drum; steam is introduced into the rotary drum for inter-wall heat transfer with the high-concentration mother liquor on the outer wall of the rotary drum; the tray is semi-cylindrical, and both ends are longer than the rotary drum to form a semi-wrapping of the rotary drum; the tray is installed at a certain angle, and a pipe opening is opened at the connection between the lowest point and the outer shell of the tray rotary drum dryer, so that the collected mother liquor not distributed on the rotary drum does not accumulate on the tray, but flows out directly from the pipe opening; the mother liquor flowing out from the pipe opening enters the primary feed tank or the secondary feed tank through the mother liquor reflux pipeline; The condensed water generated after the steam heat exchange in the drum enters the condensate tank, and the secondary gas generated after the mother liquor heat exchange outside the drum enters the bag filter for dust removal through the secondary gas pipeline, and then is discharged through the induced draft fan; the outer walls of the primary feed tank and the secondary feed tank are both provided with jackets, the distribution pipe is provided with a feed flushing port, and the tray is provided with a tray flushing port; the condensed water in the condensate tank is transported to two parallel jacket pipes, one feed flushing pipe and one tray flushing pipe through a condensate pump; the two jacket pipes are respectively connected to the jackets of the primary feed tank and the secondary feed tank, for heating or keeping the mother liquor in the tanks warm; one feed flushing pipe is connected to the feed flushing port, for flushing the distribution pipe and the nozzle; A tray flushing pipeline is connected to the tray flushing port and is used for flushing the tray.

2. The high-concentration mother liquor treatment device according to claim 1, characterized in that: The overflow port of the primary feed tank serves as the discharge port of the primary feed tank, the feed port of the primary feed tank extends into the tank body and is lower than the overflow port, and the terminal end of the feed port of the primary feed tank is an expanded section.

3. The high-concentration mother liquor treatment device according to claim 1, characterized in that: The primary feed tank and the secondary feed tank are of upper cylinder and lower cone structure, and hand holes are provided at the bottom of the primary feed tank and the secondary feed tank; a flushing water port is provided at the top of the primary feed tank, and a secondary feed tank agitator is provided in the secondary feed tank.

4. The high-concentration mother liquor treatment device according to claim 3, characterized in that: The secondary feed tank agitator is a paddle agitator, and the feed pump is a plunger pump.

5. The high-concentration mother liquor treatment device according to claim 1, characterized in that: The distribution pipe is arranged obliquely above the drum, and the nozzle of the distribution pipe semi-atomizes the mother liquid and sprays it onto the surface of the drum to form a uniform film. Steam is passed inside the drum to indirectly heat the material.

6. The high-concentration mother liquor treatment device according to claim 1, characterized in that: The tray drum dryer is divided into two structures, open type and closed type, according to whether the material contains pungent odor. If it is set to a closed type, a push-pull window is provided on the side for observing the operation of the tray drum dryer and the scraper unloading.

7. A method for treating a high-concentration mother liquor based on the high-concentration mother liquor treatment device according to any one of claims 1 to 6, characterized in that: include: The high-concentration mother liquor enters the primary feed tank for buffering, and then overflows into the secondary feed tank; After the secondary feed tank is fed, stirring is started, and the mother liquor in the secondary feed tank is transported to the tray drum dryer through the feed pump and the feed pipeline; The mother liquid is sprayed onto the surface of the drum after being semi-atomized by the distribution pipe and nozzle of the tray drum dryer, forming a uniform film. Steam is passed inside the drum to indirectly heat the material. The condensed water after steam condensation is discharged into the condensate tank and transported to various water use points by the condensate pump for reuse; The secondary gas generated during the mother liquor drying process is discharged to the bag filter for particle removal, and the gas that meets the standards is discharged outdoors by the induced draft fan; The dried solid salt is scraped and sent to the packaging machine for bulk bagging.

Images