Device for efficiently and continuously extracting potassium from Bayer mother liquor

Abstract

The utility model relates to the technical field of potassium adsorption and desorption devices, and particularly discloses a device for efficiently and continuously extracting potassium from Bayer mother liquor, which comprises an adsorption column, a mother liquor discharge header pipe arranged above the adsorption column, a residual liquor adsorption tank connected to one end of the mother liquor discharge header pipe, a washing feed header pipe arranged on the upper side of the mother liquor discharge header pipe, and a washing discharge header pipe arranged on the lower side of the washing feed header pipe. One end of the flushing feeding header pipe is connected with a flushing tank, a qualified liquid discharging header pipe is arranged above the flushing feeding header pipe, each adsorption column comprises an upper opening, a lower opening, an upper side opening and a lower side opening, and the adsorption columns are connected through valves and pipelines to form the simulated moving bed device, so that adsorption, flushing, desorption and leaching are continuously carried out; the device overcomes the intermittent operation of adsorbing and desorbing potassium by a single adsorption column, so that the components of the potassium-rich desorption solution are stable, and the recovery rate of potassium is higher than 60%.

Description

Technical Field

[0001] The utility model relates to the technical field of potassium adsorption and desorption devices, in particular to a continuous adsorption and desorption device for extracting potassium from potassium-rich Bayer mother liquor in a Bayer process alumina production plant. Background Art

[0002] Currently, most alumina production in China utilizes the Bayer process, which involves high-temperature dissolution of alkali and ground bauxite. Some metallic elements in the bauxite are also dissolved into the Bayer solution along with the aluminum. Bauxite from Shanxi, Henan, and Guizhou provinces generally has a high potassium content. Furthermore, the Bayer process is a cyclic process, and the potassium content in the mother liquor can reach 75g / L. This high potassium concentration not only increases the potassium content in the produced alumina, reducing its quality, but also complicates the electrolyte system and reduces conductivity in the downstream electrolytic aluminum process, increasing electrolysis energy consumption and shortening the life of the electrolytic cell. This seriously impacts the normal production of aluminum electrolytic enterprises. It also provides a new source of potassium. Potash is an irreplaceable and essential material foundation for agricultural production. Approximately 95% of potash is used in the production of potash fertilizer, known as the "food" of grain. It effectively improves plant growth, photosynthesis, and stress tolerance, and holds great economic potential.

[0003] Currently, the main methods for extracting potassium from alumina mother liquor are to add carbonate, tartrate and nitrate and then obtain the corresponding potassium salt by using the solubility difference through multiple evaporation and cooling crystallization, or to extract potassium from the mother liquor through precipitation. All of the above methods are to add a large amount of external substances to the sodium aluminate solution to precipitate potassium. The added external substances will have a large amount of residue in the Bayer mother liquor, which will affect the subsequent alumina production. In addition, the production process is long and complicated, and the above methods have not been commercially applied.

[0004] Therefore, it is crucial to develop a device that can be used to effectively extract potassium ions from the mother liquor of Bayer process alumina production without affecting the production capacity and quality of subsequent alumina production. Utility Model Content

[0005] (1) Technical issues to be resolved

[0006] In response to the above problems, the utility model provides a device for efficiently and continuously extracting potassium from Bayer mother liquor, in particular, a continuous adsorption and desorption device for extracting potassium from potassium-rich Bayer mother liquor in a Bayer process alumina production plant. The purpose is to solve the problems of complex operation, high operating cost and low production efficiency of current extraction devices.

[0007] (2) Technical solution

[0008] In order to solve the technical problem, the utility model provides a device for efficiently and continuously extracting potassium from Bayer mother liquor, comprising: an adsorption column, a mother liquor discharge main pipe is provided above the adsorption column, one end of the mother liquor discharge main pipe is connected to an adsorption residual liquid tank, a flushing feed main pipe is provided on the upper side of the mother liquor discharge main pipe, one end of the flushing feed main pipe is connected to a flushing tank, a qualified liquid discharge main pipe is provided above the flushing feed main pipe, one end of the qualified liquid discharge main pipe is connected to a qualified liquid tank, a leaching feed main pipe is provided above the qualified liquid discharge main pipe, one end of the leaching feed main pipe is connected to the leaching tank;

[0009] A mother liquor feed main pipe is provided below the adsorption column, and the other end of the mother liquor feed main pipe is connected to the adsorption mother liquor tank. A flushing discharge main pipe is provided below the mother liquor feed main pipe, and the other end of the flushing discharge main pipe is connected to the flushing residual liquid tank. A desorption liquid feed main pipe is provided below the flushing discharge main pipe, and one end of the desorption liquid feed main pipe is connected to the desorption liquid tank. A leaching discharge main pipe is provided below the desorption liquid feed main pipe, and one end of the leaching discharge main pipe is connected to the leaching residual liquid tank.

[0010] Furthermore, the adsorption column includes a first-stage adsorption column, a second-stage adsorption column is provided on one side of the first-stage adsorption column, a third-stage adsorption column is provided on one side of the second-stage adsorption column, a fourth-stage adsorption column is provided on one side of the third-stage adsorption column, a fifth-stage adsorption column is provided on one side of the fourth-stage adsorption column, a sixth-stage adsorption column is provided on one side of the fifth-stage adsorption column, a seventh-stage adsorption column is provided on one side of the sixth-stage adsorption column, and an eighth-stage adsorption column is provided on one side of the seventh-stage adsorption column.

[0011] Furthermore, the adsorption column includes a feed port, a discharge port, an upper side port and a lower side port, and the adsorption column is connected through a valve and a pipeline.

[0012] Furthermore, the qualified liquid discharge main pipe is located above the mother liquid discharge main pipe, and the axis of the qualified liquid discharge main pipe is parallel to the axis of the mother liquid discharge main pipe.

[0013] Furthermore, a feed port is provided at the lower end of the first-stage adsorption column, and a discharge port is provided at the upper end of the third-stage adsorption column.

[0014] Furthermore, the adsorbent in the adsorption column is a dedicated alkali-resistant composite potassium ion adsorbent.

[0015] Furthermore, the axis of the desorption liquid feed main pipe and the axis of the desorption liquid tank are located on the same straight line.

[0016] Furthermore, the multi-stage adsorption columns of the adsorption column are arranged side by side, and the multiple adsorption columns are connected in series.

[0017] Beneficial effects

[0018] 1. The utility model provides a device for efficiently and continuously extracting potassium from Bayer mother liquor. A mother liquor discharge main pipe is arranged above the adsorption column, one end of the mother liquor discharge main pipe is connected to the adsorption residual liquid tank, a flushing feed main pipe is arranged on the upper side of the mother liquor discharge main pipe, one end of the flushing feed main pipe is connected to the flushing tank, a qualified liquid discharge main pipe is arranged above the flushing feed main pipe, one end of the qualified liquid discharge main pipe is connected to the qualified liquid tank, a leaching feed main pipe is arranged above the qualified liquid discharge main pipe, and the leaching tank is arranged at one end of the leaching feed main pipe. The device for extracting potassium from Bayer mother liquor has a simple overall structure and is easy to install and disassemble.

[0019] 2. The utility model provides a highly efficient and continuous device for extracting potassium from Bayer mother liquor. The adsorption column designed in the device includes a feed port, a discharge port, an upper side port, and a lower side port. Each adsorption column is connected by valves and pipelines to form a simulated moving bed device, and forms an adsorption group, a flushing group, a desorption group, and a leaching group that move and circulate in sequence. Adsorption, flushing, desorption, and leaching are performed continuously, maintaining the continuity of the potassium extraction work and improving the efficiency of the device in extracting potassium from Bayer mother liquor. The device overcomes the intermittent operation of potassium adsorption and desorption by a single adsorption column, making the composition of the potassium-rich desorption liquid stable and the potassium recovery rate higher than 60%.

[0020] 3. The utility model provides a device for efficiently and continuously extracting potassium from Bayer mother liquor. The device effectively adsorbs and desorbs potassium ions in the Bayer mother liquor, and returns the adsorbed Bayer mother liquor to the main process of alumina production to continue alumina production, thereby maintaining the continuous production of alumina. The device has the advantages of simple operation, continuous production and low operating cost.

[0021] 4. The utility model provides a device for efficiently and continuously extracting potassium from Bayer mother liquor. The device is equipped with a feed port at the lower end of the first-stage adsorption column, a discharge port at the upper end of the third-stage adsorption column, a flushing group feed port at the upper end of the adsorption column, and a flushing group discharge port at the lower end. This structural arrangement helps to empty the Bayer mother liquor and flush the Bayer mother liquor remaining on the adsorbent. In addition, a desorption liquid feed port is provided at the lower end of the first-stage adsorption column, and a qualified liquid discharge port is provided at the upper end of the third-stage adsorption column. The elution group feed port is installed at the upper end of the adsorption column, and the elution group discharge port is installed at the lower end of the adsorption column. It can be used to empty the desorption liquid and flush the desorption liquid remaining on the adsorbent, thereby maintaining the cleanliness of the working environment of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the overall structure diagram of a device for efficiently and continuously extracting potassium from Bayer mother liquor in the utility model;

[0023] Figure 2 This is a schematic diagram of the adsorption operation of a device for efficiently and continuously extracting potassium from Bayer mother liquor according to the utility model;

[0024] Figure 3 The utility model is a schematic diagram of the desorption operation of a device for efficiently and continuously extracting potassium from Bayer mother liquor.

[0025] The names of the components corresponding to the various figure marks in the figure are: 1. adsorption column; 101. first-stage adsorption column; 102. second-stage adsorption column; 103. third-stage adsorption column; 104. fourth-stage adsorption column; 105. fifth-stage adsorption column; 106. sixth-stage adsorption column; 107. seventh-stage adsorption column; 108. eighth-stage adsorption column; 2. elution feed main pipe; 3. qualified liquid discharge main pipe; 4. flushing feed main pipe; 5. mother liquor discharge main pipe; 6. mother liquor feed main pipe; 7. flushing discharge main pipe; 8. desorption liquid feed main pipe; 9. elution discharge main pipe; 10. elution tank; 11. qualified liquid tank; 12. flushing tank; 13. adsorption residual liquid tank; 14. adsorption mother liquor tank; 15. flushing residual liquid tank; 16. desorption liquid tank; 17. elution residual liquid tank. DETAILED DESCRIPTION

[0026] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0028] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0029] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0030] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples, however, one skilled in the art will appreciate that the examples can be practiced without these specific details.

[0031] The following describes the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0032] See Figures 1 to 3 The present invention provides a device for efficiently and continuously extracting potassium from Bayer mother liquor. In order to make the practical purpose, technical solution and advantages of the present invention clearer, the specific operation process of the present invention is introduced in detail below in combination with the accompanying drawings and the working process of the device.

[0033] The utility model provides a device for efficiently and continuously extracting potassium from Bayer mother liquor, comprising: an adsorption column 1, a mother liquor discharge main pipe 5 is provided above the adsorption column 1, one end of the mother liquor discharge main pipe 5 is connected to an adsorption residual liquid tank 13, a flushing feed main pipe 4 is provided on the upper side of the mother liquor discharge main pipe 5, one end of the flushing feed main pipe 4 is connected to a flushing tank 12, a qualified liquid discharge main pipe 3 is provided above the flushing feed main pipe 4, one end of the qualified liquid discharge main pipe 3 is connected to a qualified liquid tank 11, a leaching feed main pipe 2 is provided above the qualified liquid discharge main pipe 3, one end of the leaching feed main pipe 2 is connected to a leaching tank 10;

[0034] A mother liquor feed main pipe 6 is provided below the adsorption column 1, and the other end of the mother liquor feed main pipe 6 is connected to the adsorption mother liquor tank 14. A flushing discharge main pipe 7 is provided below the mother liquor feed main pipe 6, and the other end of the flushing discharge main pipe 7 is connected to the flushing residual liquid tank 15. A desorption liquid feed main pipe 8 is provided below the flushing discharge main pipe 7, and one end of the desorption liquid feed main pipe 8 is connected to the desorption liquid tank 16. A leaching discharge main pipe 9 is provided below the desorption liquid feed main pipe 8, and one end of the leaching discharge main pipe 9 is connected to the leaching residual liquid tank 17.

[0035] See Figure 1The adsorption column 1 includes a first-stage adsorption column 101, a second-stage adsorption column 102 is provided on one side of the first-stage adsorption column 101, a third-stage adsorption column 103 is provided on one side of the second-stage adsorption column 102, a fourth-stage adsorption column 104 is provided on one side of the third-stage adsorption column 103, a fifth-stage adsorption column 105 is provided on one side of the fourth-stage adsorption column 104, a sixth-stage adsorption column 106 is provided on one side of the fifth-stage adsorption column 105, a seventh-stage adsorption column 107 is provided on one side of the sixth-stage adsorption column 106, and a seventh-stage adsorption column 107 is provided on one side of the seventh-stage adsorption column 107. There is an eighth-stage adsorption column 108, the qualified liquid discharge main pipe 3 is located above the mother liquid discharge main pipe 5, the axis of the qualified liquid discharge main pipe 3 is parallel to the axis of the mother liquid discharge main pipe 5, the lower end of the first-stage adsorption column 101 is provided with a feed port, the upper end of the third-stage adsorption column 103 is provided with a discharge port, the axis of the desorption liquid feed main pipe 8 and the axis of the desorption liquid tank 16 are located on the same straight line, the first-stage adsorption column 101 feeds from the bottom, the eighth-stage adsorption column 108 discharges from the top, the multi-stage adsorption columns of the adsorption column 1 are arranged side by side, and the multiple adsorption columns 1 are in series.

[0036] See Figures 1 to 3 The adsorption column 1 includes a feed port, a discharge port, an upper side port and a lower side port. The adsorption column 1 is connected by a valve and a pipeline. The adsorbent in the adsorption column 1 is a dedicated alkali-resistant composite potassium ion adsorbent.

[0037] The working principle and specific working process of a device for efficiently and continuously extracting potassium from Bayer mother liquor are as follows: According to the structural design diagram of the device, the multi-stage adsorption columns of the absorption column are sequentially connected in series to form four groups of adsorption columns 1 with the same flow direction and cyclic operation, namely, an adsorption group, a flushing group, a desorption group, and a leaching group; the seed mother liquor is passed into the adsorption group, the flushing liquid is passed into the flushing group, the desorption liquid is passed into the desorption group, and the leaching liquid is passed into the leaching group, and the four processes of adsorption, flushing, desorption, and leaching are respectively carried out simultaneously;

[0038] After one cycle, the control valve of the adsorption column is closed, so that the multi-stage adsorption column rotates to work. The adsorption column of the first stage of the adsorption group is converted to the flushing group. The adsorption column after elution is the last stage adsorption column of the adsorption group. The first stage adsorption column 101 after desorption is converted to the adsorption column of the elution group. The adsorption column after elution is the last stage adsorption column of the desorption group, and then enters the second cycle, and the cycle is repeated.

[0039] The adsorption residual liquid after adsorption is discharged into the adsorption residual liquid tank 13, and is discharged from the adsorption residual liquid tank 13 to the main production process of alumina by a pump. The flushing water is discharged to the alumina production process to wash the red mud. The rinsing water is discharged to the desorption liquid preparation tank for preparing the desorption liquid. Finally, the qualified liquid is sent to the evaporation crystallization process for the production of potassium salt.

[0040] The same or similar parts between the various embodiments in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0041] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A device for efficiently and continuously extracting potassium from Bayer mother liquor, characterized in that: The invention comprises an adsorption column (1), wherein a mother liquid discharge main pipe (5) is provided above the adsorption column (1), one end of the mother liquid discharge main pipe (5) is connected to an adsorption residual liquid tank (13), a flushing feed main pipe (4) is provided on the upper side of the mother liquid discharge main pipe (5), one end of the flushing feed main pipe (4) is connected to a flushing tank (12), a qualified liquid discharge main pipe (3) is provided above the flushing feed main pipe (4), one end of the qualified liquid discharge main pipe (3) is connected to a qualified liquid tank (11), a leaching feed main pipe (2) is provided above the qualified liquid discharge main pipe (3), one end of the leaching feed main pipe (2) is connected to a leaching tank (10); A mother liquor feed main pipe (6) is provided below the adsorption column (1), the other end of which is connected to an adsorption mother liquor tank (14), a flushing discharge main pipe (7) is provided below the mother liquor feed main pipe (6), the other end of which is connected to a flushing residual liquid tank (15), a desorption liquid feed main pipe (8) is provided below the flushing discharge main pipe (7), one end of which is connected to a desorption liquid tank (16), a leaching discharge main pipe (9) is provided below the desorption liquid feed main pipe (8), one end of which is connected to a leaching residual liquid tank (17).

2. The device for efficiently and continuously extracting potassium from Bayer mother liquor according to claim 1, wherein: The adsorption column (1) comprises a first-stage adsorption column (101), a second-stage adsorption column (102) is provided on one side of the first-stage adsorption column (101), a third-stage adsorption column (103) is provided on one side of the second-stage adsorption column (102), a fourth-stage adsorption column (104) is provided on one side of the third-stage adsorption column (103), a fifth-stage adsorption column (105) is provided on one side of the fourth-stage adsorption column (104), a sixth-stage adsorption column (106) is provided on one side of the fifth-stage adsorption column (105), a seventh-stage adsorption column (107) is provided on one side of the sixth-stage adsorption column (106), and an eighth-stage adsorption column (108) is provided on one side of the seventh-stage adsorption column (107).

3. The device for efficiently and continuously extracting potassium from Bayer mother liquor according to claim 1, characterized in that: The adsorption column (1) comprises a feed port, a discharge port, an upper side port and a lower side port, and the adsorption column (1) is connected via valves and pipelines.

4. The device for efficiently and continuously extracting potassium from Bayer mother liquor according to claim 1, characterized in that: The qualified liquid discharge main pipe (3) is located above the mother liquid discharge main pipe (5), and the axis of the qualified liquid discharge main pipe (3) is parallel to the axis of the mother liquid discharge main pipe (5).

5. The device for efficiently and continuously extracting potassium from Bayer mother liquor according to claim 2, wherein: The lower end of the first-stage adsorption column (101) is provided with a feed port, and the upper end of the third-stage adsorption column (103) is provided with a discharge port.

6. The device for efficiently and continuously extracting potassium from Bayer mother liquor according to claim 1, characterized in that: The adsorbent in the adsorption column (1) is a special alkali-resistant composite potassium ion adsorbent.

7. The device for efficiently and continuously extracting potassium from Bayer mother liquor according to claim 1, characterized in that: The axis of the desorption liquid feed main pipe (8) and the axis of the desorption liquid tank (16) are located on the same straight line.

8. The device for efficiently and continuously extracting potassium from Bayer mother liquor according to claim 2, characterized in that: The multi-stage adsorption columns of the adsorption columns (1) are arranged side by side, and the plurality of adsorption columns (1) are connected in series.

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