A system that can ensure the stable operation of the settling system in alumina production

Abstract

This utility model discloses a system that can ensure the stable operation of the settling system in alumina production. It includes a No. 1 separation settling tank and a No. 2 separation settling tank, each connected to a feed pipe. A feed pipe connects the feed pipes of the No. 1 and No. 2 separation settling tanks, and a feed control valve is installed on the feed pipe. Feed control valves are also installed on the feed pipes between the feed pipe and the No. 1 and No. 2 separation settling tanks. By setting up the feed pipe, feed control valve, and feed control valve, this system provides sufficient processing time and space for the separation settling tanks with deteriorating conditions, solving the technical problem of deteriorating tank conditions and ensuring the stable production operation of the separation settling tanks, thereby ensuring the stable production operation of the settling system.

Description

Technical Field

[0001] This utility model relates to the field of Bayer process alumina production technology, and in particular to a system that can ensure the stable operation of the settling system in alumina production. Background Technology

[0002] The traditional Bayer process alumina production settling system includes two separate settling tanks, No. 1 and No. 2. Each set of separate settling tanks is connected to a feed pipe. Two sets of leached slurries enter separate settling tanks No. 1 and No. 2 through the two feed pipes for separation and settling. The underflow from separate settling tanks No. 1 and No. 2 enters washing settling tank 1 through an underflow pipeline assembly. The underflow from washing settling tank 1 enters washing settling tanks 2 and 3 through a first pipeline assembly. The underflow from washing settling tank 2 enters washing settling tanks 3 and 4 through a second pipeline assembly. The underflow from washing settling tank 3 enters washing settling tank 4 through a third pipeline assembly. The underflow from washing settling tank 4 is then sent to the red mud dump via a pipeline assembly. This settling system has the following problems: 1. Two sets of leached slurries enter the No. 1 and No. 2 separation settling tanks respectively. If the condition of one of the separation settling tanks deteriorates (i.e., the clear liquid layer decreases), it will not be improved and will be detrimental to the stable production operation of both separation settling tanks. Second, the No. 1 and No. 2 separation settling tanks are not easy to clean and maintain. Third, the No. 1 washing settling tank is not easy to clean and maintain. Fourth, if the condition of the No. 1 and No. 2 washing settling tanks deteriorates, especially if the No. 1 washing tank becomes turbid, it will seriously threaten the stable operation of the two separation settling tanks. It is extremely easy for the settling system to become turbid, resulting in reduced production and stalling, leading to unstable operation of the settling system. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a system that can ensure the stable operation of the settling system in alumina production, so as to solve the technical problem of deterioration of the condition of either the No. 1 or No. 2 separation settling tank.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A system that ensures stable operation of the settling system in alumina production includes a No. 1 separation settling tank and a No. 2 separation settling tank. Each of the No. 1 and No. 2 separation settling tanks is connected to a feed pipe. A feed pipe is connected between the feed pipes of the No. 1 and No. 2 separation settling tanks. The feed pipe is equipped with a feed control valve. Feed control valves are also provided on the feed pipe between the feed pipe and the No. 1 separation settling tank and on the feed pipe between the feed pipe and the No. 2 separation settling tank.

[0006] Furthermore, there are three material transfer control valves on the material transfer pipe, two of which are connected by a first backup feed pipe. A backup feed control valve is provided on the first backup feed pipe. A backup separation settling tank is connected to the end of the first backup feed pipe. A backup underflow pipeline assembly is connected to the underflow outlet of the backup separation settling tank. The discharge end of the backup underflow pipeline assembly is connected to a washing settling tank.

[0007] Furthermore, both the underflow pipeline assembly of the No. 1 separation settling tank and the underflow pipeline assembly of the No. 2 separation settling tank include underflow pipes. One end of each underflow pipe is connected to the No. 1 and No. 2 separation settling tanks, respectively, and the other end is connected to the No. 1 washing settling tank. A second backup feed pipe is connected to each of the two underflow pipes, and a backup feed control valve is installed on each of the two second backup feed pipes. The ends of the two second backup feed pipes are connected to the backup separation settling tank. A washing feed control valve is installed on the underflow pipe between the two second backup feed pipes and the No. 1 washing settling tank. The backup underflow pipeline assembly includes a backup underflow pipe, one end of which is connected to the backup separation settling tank, and the other end is connected to the No. 1 washing settling tank. The system is equipped with two washing inlet pipes, the end of which is connected to a washing settling tank. A washing inlet control valve is installed on the two washing inlet pipes. A washing inlet control valve is also installed on a common underflow pipe between the two washing inlet pipes and the washing settling tank. The overflow pipeline assembly between the washing settling tank and the washing settling tank includes an overflow pipe. One end of the overflow pipe is connected to the overflow outlets of the washing settling tank and the washing settling tank, and the other end is connected to the inlet of the washing settling tank. A third common spare inlet pipe is connected to the overflow pipe, and a common spare inlet control valve is installed on the third common spare inlet pipe. A washing inlet control valve is also installed on the overflow pipe between the third common spare inlet pipe and the washing settling tank.

[0008] Furthermore, the underflow outlet of the first washing settling tank is connected to the second and third washing settling tanks via a first pipeline assembly. The first pipeline assembly includes a slurry pipe two connecting the first and third washing settling tanks, and a third washing feed pipe connected to the underflow pipe connected to the second separation settling tank. The end of the third washing feed pipe is connected to the slurry pipe two, and a washing feed control valve is connected to the third washing feed pipe. The underflow outlet of the second washing settling tank is connected to the third and fourth washing settling tanks via a second pipeline assembly. The second pipeline assembly includes a slurry pipe four connecting the second and fourth washing settling tanks, and a fourth washing feed pipe connected to the underflow pipe connected to the first separation settling tank. The end of the fourth washing feed pipe is connected to the slurry pipe four, and a washing feed control valve is provided on the fourth washing feed pipe.

[0009] The beneficial effects of this utility model are:

[0010] The system proposed in this invention, which ensures the stable operation of the settling system in alumina production, is achieved by setting up a feed pipe, a feed control valve, and a feed control valve. Under normal circumstances, the feed control valve is closed and the feed control valve is opened, allowing two sets of leached slurries to enter the No. 1 and No. 2 separation settling tanks respectively through two feed pipes. When the condition of the No. 1 separation settling tank deteriorates, the feed control valve and the feed control valve are controlled to reduce the feed to the No. 1 separation settling tank and increase the feed to the No. 2 separation settling tank. Similarly, when the condition of the No. 2 separation settling tank deteriorates, the feed control valve and the feed control valve are controlled to reduce the feed to the No. 2 separation settling tank and increase the feed to the No. 1 separation settling tank. This provides sufficient processing time and space for the separation settling tanks with deteriorating conditions, solving the technical problem of deteriorating tank conditions and ensuring the stable production operation of the separation settling tanks, thereby ensuring the stable production operation of the settling system.

[0011] By setting up a first backup feed pipe, a backup feed control valve, and a backup separation settling tank, the feed control valve, the material transfer control valve, and the backup feed control valve are controlled when the No. 1 separation settling tank is closed, and the two sets of leached slurries enter the No. 2 separation settling tank and the backup separation settling tank respectively. When the No. 2 separation settling tank is closed, the feed control valve, the material transfer control valve, and the first backup feed control valve are controlled, and the two sets of leached slurries enter the No. 1 separation settling tank and the backup separation settling tank respectively, which facilitates the cleaning and maintenance of the No. 1 and No. 2 separation settling tanks.

[0012] By setting up a second backup feed pipe and its backup feed control valve, and a second wash feed pipe and its wash feed control valve, when the first wash settling tank is being emptied, the second backup feed valve and the wash feed control valve are controlled so that the underflow from the first and second separation settling tanks enters the backup separation settling tank for washing and settling, and the underflow from the backup separation settling tank enters the second wash settling tank. At this time, the backup separation settling tank replaces the first wash settling tank to wash and settling the underflow from the first and second separation settling tanks, which facilitates the cleaning and maintenance of the first wash settling tank.

[0013] By setting up the washing feed pipe of wash 3 and its washing feed control valve, and the washing feed pipe of wash 4 and its washing feed control valve, when the condition of the washing settling tank of wash 1 and wash 2 deteriorates, the washing feed control valve is controlled to allow the underflow of the No. 2 separation settling tank to enter the washing settling tank of wash 3 and the underflow of the No. 1 separation settling tank to enter the washing settling tank of wash 4. This extends the processing time of the washing settling tank of wash 1 and wash 2, ensures the stable production operation of the separation settling tank, and thus ensures the stable production operation of the settling system.

[0014] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings, wherein:

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

[0017] In the diagram: Feed pipe 1, feed pipe 2, feed control valve 3, feed control valve 4, first backup feed pipe 5, backup feed control valve 6, underflow pipe 7, second backup feed pipe 8, washing feed control valve 9, backup underflow pipe 10, 2nd wash feed pipe 11, overflow pipe 12, third backup feed pipe 13, 3rd wash feed pipe 1 14, 3rd wash feed pipe 2 15, slurry pipe 2 16, slurry pipe 4 17. Detailed Implementation

[0018] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0019] Example 1

[0020] A system designed to ensure stable operation of the settling system in alumina production, based on the traditional Bayer process alumina settling system, includes a No. 1 separation settling tank and a No. 2 separation settling tank, each connected to a feed pipe 1. The improvement lies in the following: a feed transfer pipe 2 connects the feed pipes of the No. 1 and No. 2 separation settling tanks. A feed transfer control valve 3 is installed on the feed pipe 2. Feed control valves 4 are installed on the feed pipe 1 between the feed transfer pipe 2 and the No. 1 separation settling tank, and on the feed pipe 1 between the feed transfer pipe 2 and the No. 2 separation settling tank. By configuring the feed transfer pipe 2, the feed transfer control valve 3, and the feed control valve 4, under normal conditions... The material transfer control valve 3 is closed and the feed control valve 4 is opened. The two sets of leached slurries enter the No. 1 and No. 2 separation settling tanks respectively through two feed pipes. When the condition of the No. 1 separation settling tank deteriorates, the material transfer control valve 3 and the feed control valve 4 are controlled to reduce the feed to the No. 1 separation settling tank and increase the feed to the No. 2 separation settling tank. When the condition of the No. 2 separation settling tank deteriorates, the material transfer control valve 3 and the feed control valve 4 are controlled to reduce the feed to the No. 2 separation settling tank and increase the feed to the No. 1 separation settling tank. This provides sufficient processing time and space for the separation settling tanks with deteriorating conditions, solves the technical problem of deteriorating tank conditions, and ensures the stable production operation of the separation settling tanks.

[0021] There are three material transfer control valves 3 on the material transfer pipe 2. A first backup feed pipe 5 is connected between two of the material transfer control valves 3. A backup feed control valve 6 is installed on the first backup feed pipe 5. A backup separation settling tank is connected to the end of the first backup feed pipe 5. The backup separation settling tank is the same as the No. 1 separation settling tank or the No. 2 separation settling tank. A backup underflow pipeline assembly is connected to the underflow outlet of the backup separation settling tank. The backup underflow pipeline assembly is the same as the underflow pipeline assembly of the No. 1 separation settling tank or the No. 2 separation settling tank. The discharge end of the backup underflow pipeline assembly... Connect to the No. 1 washing settling tank. By setting up the first backup feed pipe 5, the backup feed control valve 6, and the backup separation settling tank, when the No. 1 separation settling tank is closed, control the feed control valve 4, the material transfer control valve 3, and the backup feed control valve 6, so that the two sets of leached slurry enter the No. 2 separation settling tank and the backup separation settling tank respectively. When the No. 2 separation settling tank is closed, control the feed control valve 4, the material transfer control valve 3, and the first backup feed control valve 6, so that the two sets of leached slurry enter the No. 1 separation settling tank and the backup separation settling tank respectively, which facilitates the cleaning and maintenance of the No. 1 or No. 2 separation settling tank.

[0022] Both the underflow piping assembly of Separation Settling Tank No. 1 and Separation Settling Tank No. 2 include underflow pipes 7. One end of each underflow pipe 7 is connected to Separation Settling Tank No. 1 and Separation Settling Tank No. 2, respectively, and the other end is connected to Washing Settling Tank No. 1. Each of the two underflow pipes 7 is connected to a second backup feed pipe 8, and each second backup feed pipe 8 is equipped with a backup feed control valve 6. The ends of the two second backup feed pipes 8 are connected to the backup separation settling tank. A washing feed control valve 9 is installed on the underflow pipe 7 between the second backup feed pipe 8 and the first washing settling tank. The backup underflow pipeline assembly includes a backup underflow pipe 10, one end of which is connected to the backup separation settling tank and the other end of which is connected to the first washing settling tank. A second washing feed pipe 11 is connected to the backup underflow pipe 10, and the end of the second washing feed pipe 11 is connected to the second washing settling tank. A washing feed control valve 9 is installed on the second washing feed pipe 11. A washing feed control valve 9 is installed on the common underflow pipe 10 between the washing feed pipe 11 of the second wash and the washing settling tank of the first wash. The overflow pipeline assembly between the washing settling tank of the first wash and the washing settling tank of the second wash includes an overflow pipe 12. One end of the overflow pipe 12 is connected to the overflow port of the washing settling tank of the first wash and the washing settling tank of the second wash, and the other end is connected to the feed port of the washing settling tank of the first wash. A third common feed pipe 13 is connected to the overflow pipe 12. A common feed control valve 6 is installed on the third common feed pipe 13. The overflow between the third common feed pipe 13 and the washing settling tank of the first wash is controlled by the overflow pipe 10. Pipe 12 is equipped with a washing feed control valve 9; by setting a second backup feed pipe 8 and its backup feed control valve 6, and a second washing feed pipe 11 and its washing feed control valve 9, when the first washing settling tank is being emptied, the backup feed valve 6 and the washing feed control valve 9 are controlled so that the underflow of the first and second separation settling tanks enters the backup separation settling tank for washing and settling, and the underflow of the backup separation settling tank enters the second washing settling tank. At this time, the backup separation settling tank replaces the first washing settling tank, which facilitates the cleaning and maintenance of the first washing settling tank.

[0023] The underflow outlet of the No. 1 washing settling tank is connected to the No. 2 and No. 3 washing settling tanks via a first pipeline assembly. The first pipeline assembly includes a slurry pipe 2 16 connecting the No. 1 and No. 3 washing settling tanks. A No. 3 washing feed pipe 14 is connected to the underflow pipe 7 connected to the No. 2 separation settling tank. The end of the No. 3 washing feed pipe 14 is connected to the slurry pipe 2 16. Washing feed control valves 9 are connected to both ends of the No. 3 washing feed pipe 14. The No. 3 washing feed pipe 14 is connected to the No. 1 washing settling tank. A washing feed control valve 9 is installed on the underflow pipe 7 between the washing and settling tanks; the underflow port of washing and settling tank 2 is connected to washing and settling tanks 3 and 4 via a second pipeline assembly. The second pipeline assembly includes a slurry pipe 17 connecting washing and settling tanks 2 and 4. A washing feed pipe 15 for washing and settling tank 4 is connected to the underflow pipe 7 connected to the No. 1 separation settling tank. The washing feed pipe 15 for washing and settling tank 4 is located on the material receiving side of the second backup feed pipe 8 and is adjacent to the second backup feed pipe 8. The end of the 4-wash feed pipe 15 is connected to the slurry pipe 17. The 4-wash feed pipe 15 is equipped with a washing feed control valve 9. By setting the 3-wash feed pipe and its washing feed control valve, and the 4-wash feed pipe and its washing feed control valve, when the condition of the 1-wash settling tank and the 2-wash settling tank deteriorates, the washing feed control valve is controlled to allow the underflow of the 2-separation settling tank to enter the 3-wash settling tank and the underflow of the 1-separation settling tank to enter the 4-wash settling tank. This extends the processing time of the 1-wash settling tank and the 2-wash settling tank, ensuring the stable production operation of the separation settling tank, and thus ensuring the stable production operation of the settling system.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A system that ensures stable operation of the settling system in alumina production, comprising a No. 1 settling tank and a No. 2 settling tank, wherein the No. 1 settling tank and the No. 2 settling tank are respectively connected to feed pipes (1), characterized in that: A feed pipe (2) is connected between the feed pipe (1) of the No. 1 separation settling tank and the feed pipe (1) of the No. 2 separation settling tank. A feed control valve (3) is provided on the feed pipe (2). Feed control valves (4) are provided on the feed pipe (1) between the feed pipe (2) and the No. 1 separation settling tank and the feed pipe (1) between the feed pipe (2) and the No. 2 separation settling tank.

2. The system according to claim 1 that ensures stable operation of the settling system in alumina production, characterized in that: There are three material control valves (3) on the material transfer pipe (2), among which two material control valves (3) are connected to a first backup feed pipe (5), a backup feed control valve (6) is provided on the first backup feed pipe (5), a backup separation sedimentation tank is connected to the end of the first backup feed pipe (5), a backup underflow pipeline assembly is connected to the underflow outlet of the backup separation sedimentation tank, and the discharge end of the backup underflow pipeline assembly is connected to a washing sedimentation tank.

3. The system according to claim 2 that ensures stable operation of the settling system in alumina production, characterized in that: Both the underflow pipeline assembly of the No. 1 separation settling tank and the underflow pipeline assembly of the No. 2 separation settling tank include underflow pipes (7). One end of each underflow pipe (7) is connected to the No. 1 and No. 2 separation settling tanks, respectively, and the other end is connected to the No. 1 washing settling tank. A second backup feed pipe (8) is connected to each of the two underflow pipes (7). A backup feed control valve (6) is provided on each of the two second backup feed pipes (8). The ends of the two second backup feed pipes (8) are connected to the backup separation settling tank. The backup underflow pipeline assembly includes a backup underflow pipe (10). One end of the backup underflow pipe (10) is connected to the backup separation settling tank, and the other end is connected to the No. 1 washing settling tank. The settling tank is connected to a 2-wash feed pipe (11) on a public bottom flow pipe (10). The end of the 2-wash feed pipe (11) is connected to the 2-wash settling tank. The 2-wash feed pipe (11) is equipped with a washing feed control valve (9). The overflow pipeline assembly between the 1-wash settling tank and the 2-wash settling tank includes an overflow pipe (12). One end of the overflow pipe (12) is connected to the overflow port of the 1-wash settling tank and the 2-wash settling tank, and the other end is connected to the feed port of the 1-wash settling tank. The overflow pipe (12) is connected to a third public feed pipe (13). The third public feed pipe (13) is equipped with a public feed control valve (6).

4. The system according to any one of claims 3 that ensures the stable operation of the settling system in alumina production, characterized in that: The underflow outlet of the No. 1 washing settling tank is connected to the No. 2 washing settling tank and the No. 3 washing settling tank through a first pipeline assembly. The first pipeline assembly includes a slurry pipe two (16) connecting the No. 1 washing settling tank and the No. 3 washing settling tank. The underflow pipe (7) connected to the No. 2 separation settling tank is connected to the No. 3 washing feed pipe (14). The end of the No. 3 washing feed pipe (14) is connected to the slurry pipe two (16). The No. 3 washing feed pipe (14) is connected to a washing feed control valve (9). The bottom outlet of the 2nd washing settling tank is connected to the 3rd washing settling tank and the 4th washing settling tank through the second pipeline assembly. The second pipeline assembly includes a slurry pipe four (17) connecting the 2nd washing settling tank and the 4th washing settling tank. The bottom outlet pipe (7) connected to the 1st separation settling tank is connected to the 4th washing feed pipe (15). The end of the 4th washing feed pipe (15) is connected to the slurry pipe four (17). The 4th washing feed pipe (15) is equipped with a washing feed control valve (9).

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