Method or system capable of ensuring stable operation of sedimentation system in aluminum oxide production

Abstract

The invention discloses a method capable of ensuring stable operation of a settling system in aluminum oxide production, which is characterized in that a material mixing pipe is connected between a feed pipe of a No.1 separation settling tank and a feed pipe of a No.2 separation settling tank, and a material mixing control valve is arranged on the material mixing pipe; feeding control valves are respectively arranged on the feeding pipe between the material mixing pipe and the No.1 separating and settling tank and the feeding pipe between the material mixing pipe and the No.2 separating and settling tank; under the normal condition, the material channeling control valve is closed, the feeding control valve is opened, and two groups of dissolved-out ore pulp enter the first separating and settling tank and the second separating and settling tank through the two feeding pipes; when the tank condition of the first separating and settling tank becomes poor, the material channeling control valve and the feeding control valve are controlled to reduce feeding of the first separating and settling tank and increase feeding of the second separating and settling tank; when the tank condition of the second separating and settling tank becomes poor, the material channeling control valve and the feeding control valve are controlled to reduce feeding of the second separating and settling tank and increase feeding of the first separating and settling tank; the invention discloses a system capable of ensuring stable operation of a sedimentation system in aluminum oxide production.

Description

Technical Field

[0001] The present invention relates to the technical field of Bayer process alumina production, in particular to a method for ensuring the stable operation of a sedimentation system in alumina production, and also to a system for ensuring the stable operation of a sedimentation system in alumina production. Background Art

[0002] The traditional Bayer process alumina production sedimentation system includes a No. 1 separation sedimentation tank and a No. 2 separation sedimentation tank. Separation sedimentation tanks No. 1 and No. 2 are each connected to a feed pipe. Two groups of dissolved slurries enter separation sedimentation tanks No. 1 and No. 2 through the two feed pipes for separation and sedimentation. The underflow of separation sedimentation tanks No. 1 and No. 2 respectively enters washing sedimentation tank No. 1 through an underflow piping assembly. The underflow of washing sedimentation tank No. 1 passes through a first piping assembly to washing sedimentation tanks No. 2 and No. 3. The underflow of washing sedimentation tank No. 2 passes through a second piping assembly to washing sedimentation tanks No. 3 and No. 4. The underflow of washing sedimentation tank No. 3 passes through a third piping assembly to washing sedimentation tank No. 4. The underflow of washing sedimentation tank No. 4 passes through a piping assembly to the red mud dump. This sedimentation system has the following problems: 1. The two groups of dissolved ore pulp enter the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank respectively. If the tank condition of one of the separation sedimentation tanks deteriorates (that is, the clear liquid layer decreases), it will not be improved, which is not conducive to the smooth production operation of the two separation sedimentation tanks; second, the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank are not easy to clean and repair; third, the No. 1 washing sedimentation tank is not easy to clean and repair; fourth, the tank condition of the No. 1 washing sedimentation tank and the No. 2 washing sedimentation tank deteriorates, especially the mixing of the No. 1 washing sedimentation tank poses a serious threat to the stable operation of the two separation sedimentation tanks, and it is extremely easy to cause the sedimentation system to run muddy, reduce production and stall, resulting in the sedimentation system being unable to operate stably. Summary of the Invention

[0003] In view of this, one of the objects of the present invention is to provide a method that can ensure the stable operation of the sedimentation system in alumina production, so as to at least solve the technical problem of the deterioration of the condition of any one of the separation sedimentation tank No. 1 and the separation sedimentation tank No. 2; the second object of the present invention is to provide a system that can ensure the stable operation of the sedimentation system in alumina production.

[0004] One of the objectives of the present invention is achieved through the following technical solutions: A method for ensuring stable operation of a sedimentation system in alumina production comprises the following steps: connecting a cross-flow pipe between a feed pipe of a No. 1 separation sedimentation tank and a feed pipe of a No. 2 separation sedimentation tank, providing a cross-flow control valve on the cross-flow pipe, and providing a feed control valve on the feed pipe between the cross-flow pipe and the No. 1 separation sedimentation tank and on the feed pipe between the cross-flow pipe and the No. 2 separation sedimentation tank; under normal circumstances, the cross-flow control valve is closed and the feed control valve is opened, and two groups of dissolved ore pulp enter the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank respectively through the two feed pipes; when the tank condition of the No. 1 separation sedimentation tank deteriorates, the cross-flow control valve and the feed control valve are controlled to reduce the feed to the No. 1 separation sedimentation tank and increase the feed to the No. 2 separation sedimentation tank; when the tank condition of the No. 2 separation sedimentation tank deteriorates, the cross-flow control valve and the feed control valve are controlled to reduce the feed to the No. 2 separation sedimentation tank and increase the feed to the No. 1 separation sedimentation tank.

[0005] Furthermore, there are three crossflow control valves on the crossflow pipe, a first public feed pipe is connected between two of the crossflow control valves, a public feed control valve is provided on the first public feed pipe, the end of the first public feed pipe is connected to a public separation sedimentation tank, the bottom flow outlet of the public separation sedimentation tank is connected to a public bottom flow pipeline assembly, and the discharge end of the public bottom flow pipeline assembly is connected to a washing sedimentation tank; when the No. 1 separation sedimentation tank exits, the feed control valve, the crossflow control valve and the public feed control valve are controlled, and the two groups of dissolved ore pulp enter the No. 2 separation sedimentation tank and the public separation sedimentation tank respectively; when the No. 2 separation sedimentation tank exits, the feed control valve, the crossflow control valve and the public feed control valve are controlled, and the two groups of dissolved ore pulp enter the No. 1 separation sedimentation tank and the public separation sedimentation tank respectively.

[0006] Furthermore, the underflow pipeline assembly of the No. 1 separation sedimentation tank and the underflow pipeline assembly of the No. 2 separation sedimentation tank both include underflow pipes, one end of the two underflow pipes are respectively connected to the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank, and the other end is connected to the No. 1 washing sedimentation tank, the two underflow pipes are respectively connected to the second public feed pipes, the two second public feed pipes are respectively provided with a public feed control valve, the ends of the two second public feed pipes are connected to the public separation sedimentation tank, and the underflow pipe between the two second public feed pipes and the No. 1 washing sedimentation tank is provided with a washing feed control valve, the public underflow pipeline assembly includes a public underflow pipe, one end of the public underflow pipe is connected to the public separation sedimentation tank, the other end is connected to the No. 1 washing sedimentation tank, the public underflow pipe is connected to the No. 2 washing feed pipe, the end of the No. 2 washing feed pipe is connected to the No. 2 washing sedimentation tank, and the No. 2 washing feed pipe is provided with a washing A washing feed control valve is provided on the public underflow pipe between the 2nd washing feed pipe and the 1st washing sedimentation tank. The overflow pipeline assembly between the 1st washing sedimentation tank and the 2nd washing washing sedimentation tank includes an overflow pipe, one end of the overflow pipe is connected to the overflow port of the 1st washing sedimentation tank and the 2nd washing washing sedimentation tank, and the other end is connected to the feed port of the 1st washing sedimentation tank. The overflow pipe is connected to a third public feed pipe, and a public feed control valve is provided on the third public feed pipe. A washing feed control valve is provided on the overflow pipe between the third public feed pipe and the 1st washing sedimentation tank; when the 1st washing sedimentation tank is withdrawn, the public feed control valve and the washing feed control valve are controlled, and the underflow of the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank enters the public separation sedimentation tank for washing and sedimentation, and the underflow of the public separation sedimentation tank enters the 2nd washing sedimentation tank.

[0007] Furthermore, the bottom flow port of the 1st washing sedimentation tank is connected to the 2nd washing sedimentation tank and the 3rd washing sedimentation tank through the first pipeline assembly, the first pipeline assembly includes a slurry pipe 2 connecting the 1st washing sedimentation tank and the 3rd washing sedimentation tank, the bottom flow pipe connected to the 2nd separation sedimentation tank is connected to the 3rd washing feed pipe, the end of the 3rd washing feed pipe is connected to the slurry pipe 2, and the 3rd washing feed pipe is connected to the washing feed control valve; the bottom flow port of the 2nd washing sedimentation tank is connected to the 3rd washing sedimentation tank and the 4th washing sedimentation tank through the second pipeline assembly, the second pipeline The component includes a slurry pipe four connecting the No. 2 washing sedimentation tank and the No. 4 washing sedimentation tank, and a No. 4 washing feed pipe is connected to the underflow pipe connected to the No. 1 separation sedimentation tank. The end of the No. 4 washing feed pipe is connected to the slurry pipe four, and the No. 4 washing feed pipe is provided with a washing feed control valve; when the tank conditions of the No. 1 washing sedimentation tank and the No. 2 washing sedimentation tank deteriorate, the washing feed control valve is controlled to make the underflow of the No. 2 separation sedimentation tank enter the No. 3 washing sedimentation tank and the underflow of the No. 1 separation sedimentation tank enter the No. 4 washing sedimentation tank, thereby extending the processing time of the No. 1 washing sedimentation tank and the No. 2 washing sedimentation tank.

[0008] The second object of the present invention is achieved through the following technical solutions: A system that can ensure the stable operation of the sedimentation system in alumina production, which includes a No. 1 separation sedimentation tank and a No. 2 separation sedimentation tank, wherein the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank are respectively connected with a feed pipe, and a cross-flow pipe is connected between the feed pipe of the No. 1 separation sedimentation tank and the feed pipe of the No. 2 separation sedimentation tank, and a cross-flow control valve is provided on the cross-flow pipe. Feed control valves are respectively provided on the feed pipe between the cross-flow pipe and the No. 1 separation sedimentation tank and on the feed pipe between the cross-flow pipe and the No. 2 separation sedimentation tank.

[0009] Furthermore, there are three crossflow control valves on the crossflow pipe, wherein a first public feed pipe is connected between two of the crossflow control valves, a public feed control valve is provided on the first public feed pipe, the end of the first public feed pipe is connected to a public separation sedimentation tank, the bottom flow outlet of the public separation sedimentation tank is connected to a public bottom flow pipeline assembly, and the discharge end of the public bottom flow pipeline assembly is connected to a washing sedimentation tank.

[0010] Furthermore, the underflow pipeline assembly of the No. 1 separation sedimentation tank and the underflow pipeline assembly of the No. 2 separation sedimentation tank both include underflow pipes, one end of the two underflow pipes are respectively connected to the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank, and the other end is connected to the No. 1 washing sedimentation tank, and the two underflow pipes are respectively connected to the second public feed pipes, and the two second public feed pipes are respectively provided with a public feed control valve, and the ends of the two second public feed pipes are connected to the public separation sedimentation tank, and the underflow pipe between the two second public feed pipes and the No. 1 washing sedimentation tank is provided with a washing feed control valve, and the public underflow pipeline assembly includes a public underflow pipe, one end of the public underflow pipe is connected to the public separation sedimentation tank, and the other end is connected to the No. 1 washing sedimentation tank, and the public underflow pipe is provided with a public feed control valve. It is connected to 2 wash washing feed pipes, the ends of the 2 wash washing feed pipes are connected to 2 wash washing sedimentation tanks, and the 2 wash washing feed pipes are provided with a washing feed control valve. The public underflow pipe between the 2 wash washing feed pipes and the 1 wash washing sedimentation tank is provided with a washing feed control valve. The overflow pipeline assembly between the 1 wash washing sedimentation tank and the 2 wash washing sedimentation tank includes an overflow pipe, one end of the overflow pipe is connected to the overflow ports of the 1 wash washing sedimentation tank and the 2 wash washing sedimentation tank, and the other end is connected to the feed port of the 1 wash washing sedimentation tank. The overflow pipe is connected to a third public feed pipe, and the third public feed pipe is provided with a public feed control valve. The overflow pipe between the third public feed pipe and the 1 wash washing sedimentation tank is provided with a washing feed control valve.

[0011] Furthermore, the bottom flow outlet of the 1st wash washing sedimentation tank is connected to the 2nd wash washing sedimentation tank and the 3rd wash washing sedimentation tank through a first pipeline assembly, the first pipeline assembly includes a slurry pipe 2 connecting the 1st wash washing sedimentation tank and the 3rd wash washing sedimentation tank, the bottom flow pipe connected to the No. 2 separation sedimentation tank is connected to the 3rd wash washing feed pipe, the end of the 3rd wash washing feed pipe is connected to the slurry pipe 2, and the 3rd wash washing feed pipe is connected to a washing feed control valve; the bottom flow outlet of the 2nd wash washing sedimentation tank is connected to the 3rd wash washing sedimentation tank and the 4th wash washing sedimentation tank through a second pipeline assembly, the second pipeline assembly includes a slurry pipe 4 connecting the 2nd wash washing sedimentation tank and the 4th wash washing sedimentation tank, the bottom flow pipe connected to the No. 1 separation sedimentation tank is connected to the 4th wash washing feed pipe, the end of the 4th wash washing feed pipe is connected to the slurry pipe 4, and the 4th wash washing feed pipe is provided with a washing feed control valve.

[0012] The beneficial effects of the present invention are: The method proposed in the present invention can ensure the stable operation of the sedimentation system in alumina production. By setting a crossflow pipe, a crossflow control valve and a feed control valve, under normal circumstances, the crossflow control valve is closed and the feed control valve is opened, and two groups of dissolved ore pulp enter the separation sedimentation tank No. 1 and the separation sedimentation tank No. 2 respectively through the two feed pipes; when the tank condition of the separation sedimentation tank No. 1 deteriorates, the crossflow control valve and the feed control valve are controlled to reduce the feed of the separation sedimentation tank No. 1 and increase the feed of the separation sedimentation tank No. 2; when the tank condition of the separation sedimentation tank No. 2 deteriorates, the crossflow control valve and the feed control valve are controlled to reduce the feed of the separation sedimentation tank No. 2 and increase the feed of the separation sedimentation tank No. 1, leaving sufficient processing time and space for the separation sedimentation tank with deteriorated tank condition, solving the technical problem of deterioration of the tank condition of the separation sedimentation tank, ensuring the smooth production operation of the separation sedimentation tank, and further ensuring the smooth production operation of the sedimentation system.

[0013] By setting the first public feed pipe, public feed control valve and public separation sedimentation tank, when the No. 1 separation sedimentation tank exits, the feed control valve, the cross-flow control valve and the public feed control valve are controlled, and the two groups of dissolved ore slurries enter the No. 2 separation sedimentation tank and the public separation sedimentation tank respectively; when the No. 2 separation sedimentation tank exits, the feed control valve, the cross-flow control valve and the first public feed control valve are controlled, and the two groups of dissolved ore slurries enter the No. 1 separation sedimentation tank and the public separation sedimentation tank respectively, which is convenient for the cleaning and maintenance of the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank.

[0014] By setting a second public feed pipe and a public feed control valve thereon, a No. 2 wash feed pipe and a wash feed control valve thereon, when the No. 1 wash sedimentation tank is withdrawn, the second public feed valve and the wash feed control valve are controlled, and the bottom flow of the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank enters the public separation sedimentation tank for washing and sedimentation, and the bottom flow of the public separation sedimentation tank enters the No. 2 wash sedimentation tank. At this time, the public separation sedimentation tank replaces the No. 1 wash sedimentation tank to wash and sediment the bottom flow of the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank, which is convenient for cleaning and maintenance of the No. 1 wash sedimentation tank.

[0015] By setting the 3rd wash washing feed pipe and the wash feed control valve thereon, and the 4th wash washing feed pipe and the wash feed control valve thereon, when the tank conditions of the 1st wash washing sedimentation tank and the 2nd wash washing sedimentation tank deteriorate, the wash feed control valves are controlled to make the bottom flow of the No. 2 separation sedimentation tank enter the 3rd wash washing sedimentation tank, and the bottom flow of the No. 1 separation sedimentation tank enter the 4th wash washing sedimentation tank, thereby extending the processing time of the 1st wash washing sedimentation tank and the 2nd wash washing sedimentation tank, ensuring the smooth production operation of the separation sedimentation tank, and thus ensuring the smooth production operation of the sedimentation system.

[0016] The system proposed by the present invention, which can ensure the stable operation of the sedimentation system in the production of alumina, has a simple structure, low cost and is easy to implement.

[0017] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings, in which: Figure 1 It is a structural schematic diagram of the present invention.

[0019] In the figure: feed pipe 1, channeling pipe 2, channeling control valve 3, feed control valve 4, first public feed pipe 5, public feed control valve 6, underflow pipe 7, second public feed pipe 8, washing feed control valve 9, public underflow pipe 10, 2nd wash feed pipe 11, overflow pipe 12, third public feed pipe 13, 3rd wash feed pipe 14, 3rd wash feed pipe 2 15, slurry pipe 2 16, slurry pipe 4 17. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, and are not intended to limit the scope of protection of the present invention.

[0021] Example 1 like Figure 1 The method shown in the figure can ensure the stable operation of the sedimentation system in the production of alumina, which is based on the traditional Bayer process alumina production sedimentation system, that is, a cross-flow pipe 2 is connected between the feed pipe of the No. 1 separation sedimentation tank and the feed pipe 1 of the No. 2 separation sedimentation tank, a cross-flow control valve 3 is provided on the cross-flow pipe 2, and a feed control valve 4 is provided on the feed pipe 1 between the cross-flow pipe 2 and the No. 1 separation sedimentation tank and the feed pipe 1 between the cross-flow pipe 2 and the No. 2 separation sedimentation tank; under normal circumstances, the cross-flow control valve 3 is closed and the feed control valve 4 is opened, and two groups of dissolved ore pulps enter the No. 1 separation sedimentation tank respectively through the two feed pipes 1. 1 separation sedimentation tank and No. 2 separation sedimentation tank; when the tank condition of No. 1 separation sedimentation tank deteriorates, the cross-flow control valve 3 and the feed control valve 4 are controlled to reduce the feed of No. 1 separation sedimentation tank and increase the feed of No. 2 separation sedimentation tank; when the tank condition of No. 2 separation sedimentation tank deteriorates, the cross-flow control valve 3 and the feed control valve 4 are controlled to reduce the feed of No. 2 separation sedimentation tank and increase the feed of No. 1 separation sedimentation tank, leaving enough processing time and space for the separation sedimentation tank with deteriorated tank condition, solving the technical problem of deteriorated tank condition of separation sedimentation tank, ensuring the smooth production operation of separation sedimentation tank, and thus ensuring the smooth production operation of sedimentation system.

[0022] There are three cross-flow control valves 3 on the cross-flow pipe 2, and a first public feed pipe 5 is connected between two of the cross-flow control valves 3. A public feed control valve 6 is provided on the first public feed pipe 5. The end of the first public feed pipe 5 is connected to a public separation sedimentation tank, which is consistent with the No. 1 separation sedimentation tank or the No. 2 separation sedimentation tank. A public underflow pipeline assembly is connected to the underflow outlet of the public separation sedimentation tank, which is consistent with the underflow pipeline assembly of the No. 1 separation sedimentation tank or the No. 2 separation sedimentation tank. The discharge end of the public underflow pipeline assembly is connected to the No. 1 washing sedimentation tank; when the No. 1 separation sedimentation tank exits, the feed control valve 4, the crossflow control valve 3 and the public feed control valve 6 are controlled, and the two groups of dissolved ore slurries enter the No. 2 separation sedimentation tank and the public separation sedimentation tank respectively; when the No. 2 separation sedimentation tank exits, the feed control valve 4, the crossflow control valve 3 and the public feed control valve 6 are controlled, and the two groups of dissolved ore slurries enter the No. 1 separation sedimentation tank and the public separation sedimentation tank respectively, which is convenient for the cleaning and maintenance of the No. 1 separation sedimentation tank or the No. 2 separation sedimentation tank.

[0023] The underflow piping assembly of No. 1 separation sedimentation tank and the underflow piping assembly of No. 2 separation sedimentation tank both include underflow pipes 7, one end of the two underflow pipes 7 is respectively connected to No. 1 separation sedimentation tank and No. 2 separation sedimentation tank, and the other end is connected to No. 1 washing sedimentation tank. The two underflow pipes 7 are respectively connected to the second public feed pipes 8, and the two second public feed pipes 8 are respectively provided with public feed control valves 6. The ends of the two second public feed pipes 8 are connected to the public separation sedimentation tank. The two second public A washing feed control valve 9 is provided on the underflow pipe 7 between the feed pipe 8 and the 1st washing sedimentation tank. The public underflow pipeline assembly includes a public underflow pipe 10. One end of the public underflow pipe 10 is connected to the public separation sedimentation tank and the other end is connected to the 1st washing sedimentation tank. The public underflow pipe 10 is connected to the 2nd washing feed pipe 11. The end of the 2nd washing feed pipe 11 is connected to the 2nd washing sedimentation tank. The 2nd washing feed pipe 11 is provided with a washing feed control valve 9. The 2nd washing feed pipe 1 The public underflow pipe 10 between 1 and 1 wash washing sedimentation tanks is provided with a washing feed control valve 9, and the overflow pipeline assembly between the 1 wash washing sedimentation tank and the 2 wash washing sedimentation tank includes an overflow pipe 12, one end of the overflow pipe 12 is connected to the overflow port of the 1 wash washing sedimentation tank and the 2 wash washing sedimentation tank, and the other end is connected to the feed port of the 1 wash washing sedimentation tank. The overflow pipe 12 is connected to the third public feed pipe 13, and the third public feed pipe 13 is provided with a public feed control valve 6. A washing feed control valve 9 is provided on the overflow pipe 12 between the feed pipe 13 and the No. 1 washing sedimentation tank; when the No. 1 washing sedimentation tank is withdrawn, the public feed control valve 6 and the washing feed control valve 9 are controlled, and the bottom flow of the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank enters the public separation sedimentation tank for washing and sedimentation, and the bottom flow of the public separation sedimentation tank enters the No. 2 washing sedimentation tank. At this time, the public separation sedimentation tank replaces the No. 1 washing sedimentation tank, which is convenient for cleaning and maintenance of the No. 1 washing sedimentation tank.

[0024] The bottom flow outlet of the 1st washing sedimentation tank is connected to the 2nd washing sedimentation tank and the 3rd washing sedimentation tank through the first pipeline assembly. The first pipeline assembly includes a slurry pipe 2 16 connecting the 1st washing sedimentation tank and the 3rd washing sedimentation tank. The bottom flow pipe 7 connected to the 2nd separation sedimentation tank is connected to the 3rd washing feed pipe 14. The end of the 3rd washing feed pipe 14 is connected to the slurry pipe 2 16. The 3rd washing feed pipe 14 is connected to the washing feed control valve 9. The 3rd washing feed pipe 14 is connected to the 1st washing sedimentation tank. A washing feed control valve 9 is provided on the underflow pipe 7 between the washing and settling tanks; the underflow port of the 2nd washing and settling tank is connected to the 3rd washing and settling tank and the 4th washing and settling tank through a second pipeline assembly, the second pipeline assembly includes a slurry pipe 17 connecting the 2nd washing and settling tank and the 4th washing and settling tank, and the underflow pipe 7 connected to the 1st separation and settling tank is connected to the 4th washing and feed pipe 15, the 4th washing and feed pipe 15 is on the material side of the second public feed pipe 8 and is adjacent to the second public feed pipe 8, the end of the 4th washing and feed pipe 15 is connected to the slurry pipe 19 17, and the 4th washing and feed pipe 15 is provided with a washing feed control valve 9; when the tank conditions of the 1st washing and settling tank and the 2nd washing and settling tank deteriorate, the washing feed control valve 9 is controlled to make the underflow of the 2nd separation and settling tank enter the 3rd washing and settling tank, and the underflow of the 1st separation and settling tank enter the 4th washing and settling tank, thereby extending the processing time of the 1st washing and settling tank and the 2nd washing and settling tank.

[0025] Example 2 A system that can ensure the stable operation of the sedimentation system in alumina production is based on the traditional Bayer process alumina production sedimentation system. It includes a No. 1 separation sedimentation tank and a No. 2 separation sedimentation tank. The No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank are respectively connected with a feed pipe 1. The improvement is that: a cross-flow pipe 2 is connected between the feed pipe of the No. 1 separation sedimentation tank and the feed pipe of the No. 2 separation sedimentation tank, and a cross-flow control valve 3 is provided on the cross-flow pipe 2. A feed control valve 4 is respectively provided on the feed pipe 1 between the cross-flow pipe 2 and the No. 1 separation sedimentation tank and the feed pipe 1 between the cross-flow pipe and the No. 2 separation sedimentation tank. By setting the cross-flow pipe 2, the cross-flow control valve 3 and the feed control valve 4, under normal circumstances Close the crossflow control valve 3 and open the feed control valve 4, and the two groups of dissolved ore slurries enter the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank respectively through two feed pipes; when the tank condition of the No. 1 separation sedimentation tank deteriorates, control the crossflow control valve 3 and the feed control valve 4 to reduce the feed of the No. 1 separation sedimentation tank and increase the feed of the No. 2 separation sedimentation tank; when the tank condition of the No. 2 separation sedimentation tank deteriorates, control the crossflow control valve 3 and the feed control valve 4 to reduce the feed of the No. 2 separation sedimentation tank and increase the feed of the No. 1 separation sedimentation tank, leaving enough processing time and space for the separation sedimentation tank with deteriorated tank condition, solving the technical problem of deterioration of the separation sedimentation tank condition, and ensuring the smooth production operation of the separation sedimentation tank.

[0026] There are three cross-flow control valves 3 on the cross-flow pipe 2, and a first public feed pipe 5 is connected between two of the cross-flow control valves 3. A public feed control valve 6 is provided on the first public feed pipe 5. The end of the first public feed pipe 5 is connected to a public separation sedimentation tank, which is consistent with the No. 1 separation sedimentation tank or the No. 2 separation sedimentation tank. A public underflow pipeline assembly is connected to the underflow outlet of the public separation sedimentation tank, which is consistent with the underflow pipeline assembly of the No. 1 separation sedimentation tank or the No. 2 separation sedimentation tank. The discharge end of the public underflow pipeline assembly is connected to the discharge outlet of the public underflow pipeline assembly. Connect 1 washing sedimentation tank, and set the first public feed pipe 5, public feed control valve 6 and public separation sedimentation tank. When the No. 1 separation sedimentation tank exits, the feed control valve 4, the cross-flow control valve 3 and the public feed control valve 6 are controlled, and the two groups of dissolved ore pulp enter the No. 2 separation sedimentation tank and the public separation sedimentation tank respectively; when the No. 2 separation sedimentation tank exits, the feed control valve 4, the cross-flow control valve 3 and the first public feed control valve 6 are controlled, and the two groups of dissolved ore pulp enter the No. 1 separation sedimentation tank and the public separation sedimentation tank respectively, which is convenient for the cleaning and maintenance of the No. 1 separation sedimentation tank or the No. 2 separation sedimentation tank.

[0027] The underflow piping assembly of No. 1 separation sedimentation tank and the underflow piping assembly of No. 2 separation sedimentation tank both include underflow pipes 7, one end of the two underflow pipes 7 is respectively connected to No. 1 separation sedimentation tank and No. 2 separation sedimentation tank, and the other end is connected to No. 1 washing sedimentation tank. The two underflow pipes 7 are respectively connected to the second public feed pipes 8, and the two second public feed pipes 8 are respectively provided with public feed control valves 6. The ends of the two second public feed pipes 8 are connected to the public separation sedimentation tank. The two second public feed pipes 8 are connected to No. 1 washing sedimentation tank. The underflow pipe 7 between the two is provided with a washing feed control valve 9, and the public underflow pipeline assembly includes a public underflow pipe 10, one end of the public underflow pipe 10 is connected to the public separation sedimentation tank, and the other end is connected to the 1st washing sedimentation tank. The public underflow pipe 10 is connected to the 2nd washing feed pipe 11, and the end of the 2nd washing feed pipe 11 is connected to the 2nd washing sedimentation tank. The 2nd washing feed pipe 11 is provided with a washing feed control valve 9, and the public underflow pipe 10 between the 2nd washing feed pipe 11 and the 1st washing sedimentation tank is provided with a washing Wash feed control valve 9, the overflow pipeline assembly between the 1st wash settling tank and the 2nd wash settling tank includes an overflow pipe 12, one end of the overflow pipe 12 is connected to the overflow port of the 1st wash settling tank and the 2nd wash settling tank, and the other end is connected to the feed port of the 1st wash settling tank, the overflow pipe 12 is connected to the third public feed pipe 13, the third public feed pipe 13 is provided with a public feed control valve 6, the overflow pipe 12 between the third public feed pipe 13 and the 1st wash settling tank is provided with a wash feed control valve 9; By setting a second public feed pipe 8 and the public feed control valve 6 thereon, a second wash feed pipe 11 and the wash feed control valve 9 thereon, when the No. 1 wash sedimentation tank is withdrawn, the public feed valve 6 and the wash feed control valve 9 are controlled, and the bottom flow of the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank enters the public separation sedimentation tank for washing and sedimentation, and the bottom flow of the public separation sedimentation tank enters the No. 2 wash sedimentation tank. At this time, the public separation sedimentation tank replaces the No. 1 wash sedimentation tank, which is convenient for cleaning and maintenance of the No. 1 wash sedimentation tank.

[0028] The bottom flow outlet of the 1st washing sedimentation tank is connected to the 2nd washing sedimentation tank and the 3rd washing sedimentation tank through the first pipeline assembly. The first pipeline assembly includes a slurry pipe 2 16 connecting the 1st washing sedimentation tank and the 3rd washing sedimentation tank, and the bottom flow pipe 7 connected to the No. 2 separation sedimentation tank is connected to the 3rd washing feed pipe 14. The end of the 3rd washing feed pipe 14 is connected to the slurry pipe 2 16. The two ends of the 3rd washing feed pipe 14 are connected to a washing feed control valve 9. A washing feed control valve 9 is provided on the bottom flow pipe 7 between the 3rd washing feed pipe 14 and the 1st washing sedimentation tank; the bottom flow outlet of the 2nd washing sedimentation tank is connected to the 3rd washing sedimentation tank and the 4th washing sedimentation tank through the second pipeline assembly. The second pipeline assembly includes a slurry pipe 4 17 connecting the 2nd washing sedimentation tank and the 4th washing sedimentation tank, and a slurry pipe 5 connected to the No. 1 separation sedimentation tank. The underflow pipe 7 is connected to a 4-wash washing feed pipe 15, which is on the material side of the second public feed pipe 8 and adjacent to the second public feed pipe 8. The end of the 4-wash washing feed pipe 15 is connected to a slurry pipe 17. A washing feed control valve 9 is provided on the 4-wash washing feed pipe 15. By setting the 3-wash washing feed pipe and the washing feed control valve thereon, and the 4-wash washing feed pipe and the washing feed control valve thereon, when the tank conditions of the 1-wash washing sedimentation tank and the 2-wash washing sedimentation tank deteriorate, the washing feed control valve is controlled to make the underflow of the No. 2 separation sedimentation tank enter the 3-wash washing sedimentation tank, and the underflow of the No. 1 separation sedimentation tank enter the 4-wash washing sedimentation tank, thereby extending the processing time of the 1-wash washing sedimentation tank and the 2-wash washing sedimentation tank, ensuring the smooth production operation of the separation sedimentation tank, and thus ensuring the smooth production operation of the sedimentation system.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for ensuring stable operation of a sedimentation system in alumina production, characterized by: A cross-flow pipe (2) is connected between the feed pipe (1) of the No. 1 separation sedimentation tank and the feed pipe (1) of the No. 2 separation sedimentation tank, and a cross-flow control valve (3) is provided on the cross-flow pipe (2). A feed control valve (4) is provided on the feed pipe (1) between the cross-flow pipe (2) and the No. 1 separation sedimentation tank and the feed pipe (1) between the cross-flow pipe and the No. 2 separation sedimentation tank. Under normal circumstances, the cross-flow control valve (3) is closed and the feed control valve (4) is opened. The two groups The dissolved slurry enters the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank respectively through two feed pipes (1); when the tank condition of the No. 1 separation sedimentation tank deteriorates, the cross-flow control valve (3) and the feed control valve (4) are controlled to reduce the feed of the No. 1 separation sedimentation tank and increase the feed of the No. 2 separation sedimentation tank; when the tank condition of the No. 2 separation sedimentation tank deteriorates, the cross-flow control valve (3) and the feed control valve (4) are controlled to reduce the feed of the No. 2 separation sedimentation tank and increase the feed of the No. 1 separation sedimentation tank.

2. The method for ensuring stable operation of a sedimentation system in alumina production according to claim 1, characterized in that: There are three cross-flow control valves (3) on the cross-flow pipe (2), a first public feed pipe (5) is connected between two of the cross-flow control valves (3), a public feed control valve (6) is provided on the first public feed pipe (5), the end of the first public feed pipe (5) is connected to the public separation sedimentation tank, the bottom flow outlet of the public separation sedimentation tank is connected to the public bottom flow pipeline assembly, and the discharge end of the public bottom flow pipeline assembly is connected to the first washing sedimentation tank; when the No. 1 separation sedimentation tank exits, the feed control valve (4), the cross-flow control valve (3) and the public feed control valve (6) are controlled, and the two groups of dissolved ore pulp enter the No. 2 separation sedimentation tank and the public separation sedimentation tank respectively; when the No. 2 separation sedimentation tank exits, the feed control valve (4), the cross-flow control valve (3) and the public feed control valve (6) are controlled, and the two groups of dissolved ore pulp enter the No. 1 separation sedimentation tank and the public separation sedimentation tank respectively.

3. The method for ensuring stable operation of a sedimentation system in alumina production according to claim 2, characterized in that: The underflow pipeline assembly of the No. 1 separation sedimentation tank and the underflow pipeline assembly of the No. 2 separation sedimentation tank both include an underflow pipe (7), one end of the two underflow pipes (7) is respectively connected to the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank, and the other end is connected to the No. 1 washing sedimentation tank. The two underflow pipes (7) are respectively connected to a second public feed pipe (8), and the two second public feed pipes (8) are respectively provided with a public feed control valve (6). The ends of the two second public feed pipes (8) are connected to the public separation sedimentation tank. The public underflow pipeline assembly includes a public underflow pipe (10), one end of the public underflow pipe (10) is connected to the public separation sedimentation tank, and the other end is connected to the No. 1 washing sedimentation tank. The public underflow pipe (10) is connected to the No. 2 washing feed pipe (11), and the end of the No. 2 washing feed pipe (11) is connected to the No. 1 washing sedimentation tank. 2 wash settling tanks, a wash feed control valve (9) is provided on the 2 wash feed pipe (11), an overflow pipe assembly between the 1 wash settling tank and the 2 wash settling tank comprises an overflow pipe (12), one end of the overflow pipe (12) is connected to the overflow ports 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, a third public feed pipe (13) is connected to the overflow pipe (12), and a public feed control valve (6) is provided on the third public feed pipe (13); when the 1 wash settling tank is withdrawn, the public feed control valve (6) and the wash feed control valve (9) are controlled, and the bottom flows of the No. 1 separation settling tank and the No. 2 separation settling tank enter the public separation settling tank for washing and settling, and the bottom flow of the public separation settling tank enters the 2 wash settling tank.

4. The method for ensuring stable operation of a sedimentation system in alumina production according to any one of claim 3, characterized in that: The bottom flow outlet of the 1st washing sedimentation tank is connected to the 2nd washing sedimentation tank and the 3rd washing sedimentation tank through a first pipeline assembly, the first pipeline assembly includes a slurry pipe 2 (16) connecting the 1st washing sedimentation tank and the 3rd washing sedimentation tank, the bottom flow pipe (7) connected to the 2nd separation sedimentation tank is connected to the 3rd washing feed pipe (14), the end of the 3rd washing feed pipe (14) is connected to the slurry pipe 2 (16), and the 3rd washing feed pipe (14) is connected to a washing feed control valve (9); the bottom flow outlet of the 2nd washing sedimentation tank is connected to the 3rd washing sedimentation tank and the 4th washing sedimentation tank through a second pipeline assembly, the second pipeline assembly includes The invention comprises a slurry pipe four (17) connecting the No. 2 washing sedimentation tank and the No. 4 washing sedimentation tank, a bottom flow pipe (7) connected to the No. 1 separation sedimentation tank is connected to the No. 4 washing feed pipe (15), the end of the No. 4 washing feed pipe (15) is connected to the slurry pipe four (17), and the No. 4 washing feed pipe (15) is provided with a washing feed control valve (9); when the tank conditions of the No. 1 washing sedimentation tank and the No. 2 washing sedimentation tank deteriorate, the washing feed control valve (9) is controlled to make the bottom flow of the No. 2 separation sedimentation tank enter the No. 3 washing sedimentation tank and the bottom flow of the No. 1 separation sedimentation tank enter the No. 4 washing sedimentation tank, thereby extending the processing time of the No. 1 washing sedimentation tank and the No. 2 washing sedimentation tank.

5. A system capable of ensuring stable operation of a sedimentation system in alumina production, comprising a No. 1 separation sedimentation tank and a No. 2 separation sedimentation tank, wherein the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank are respectively connected to a feed pipe (1), characterized in that: A cross-flow pipe (2) is connected between the feed pipe (1) of the No. 1 separation sedimentation tank and the feed pipe (1) of the No. 2 separation sedimentation tank, and a cross-flow control valve (3) is provided on the cross-flow pipe (2). A feed control valve (4) is provided on the feed pipe (1) between the cross-flow pipe (2) and the No. 1 separation sedimentation tank and the feed pipe (1) between the cross-flow pipe (2) and the No. 2 separation sedimentation tank, respectively.

6. The system for ensuring stable operation of a sedimentation system in alumina production according to claim 5, characterized in that: There are three crossflow control valves (3) on the crossflow pipe (2), wherein a first public feed pipe (5) is connected between two of the crossflow control valves (3), a public feed control valve (6) is provided on the first public feed pipe (5), a public separation sedimentation tank is connected to the end of the first public feed pipe (5), a public underflow pipeline assembly is connected to the underflow outlet of the public separation sedimentation tank, and a discharge end of the public underflow pipeline assembly is connected to a washing sedimentation tank.

7. The system for ensuring stable operation of a sedimentation system in alumina production according to claim 6, characterized in that: The underflow pipeline assembly of the No. 1 separation sedimentation tank and the underflow pipeline assembly of the No. 2 separation sedimentation tank both include an underflow pipe (7), one end of the two underflow pipes (7) is connected to the No. 1 separation sedimentation tank and the No. 2 separation sedimentation tank, respectively, and the other end is connected to the No. 1 washing sedimentation tank. The two underflow pipes (7) are respectively connected to a second public feed pipe (8), and the two second public feed pipes (8) are respectively provided with a public feed control valve (6). The ends of the two second public feed pipes (8) are connected to the public separation sedimentation tank. The public underflow pipeline assembly includes a public underflow pipe (10), one end of the public underflow pipe (10) is connected to the No. 1 separation sedimentation tank, and the other end is connected to the No. 1 washing sedimentation tank. The sedimentation tank is provided with a second washing feed pipe (11) connected to the public underflow pipe (10), the end of the second washing feed pipe (11) is connected to the second washing sedimentation tank, and the second washing feed pipe (11) is provided with a washing feed control valve (9). The overflow pipeline assembly between the first washing sedimentation tank and the second washing sedimentation tank includes an overflow pipe (12), one end of the overflow pipe (12) is connected to the overflow ports of the first washing sedimentation tank and the second washing sedimentation tank, and the other end is connected to the feed port of the first washing sedimentation tank. The overflow pipe (12) is connected to a third public feed pipe (13), and the third public feed pipe (13) is provided with a public feed control valve (6).

8. The system for ensuring stable operation of a sedimentation system in alumina production according to any one of claim 7, characterized in that: The bottom flow outlet of the No. 1 washing sedimentation tank is connected to the No. 2 washing sedimentation tank and the No. 3 washing sedimentation tank through a first pipeline assembly, the first pipeline assembly includes a slurry pipe 2 (16) connecting the No. 1 washing sedimentation tank and the No. 3 washing sedimentation tank, the bottom flow pipe (7) connected to the No. 2 separation sedimentation 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 2 (16), and the No. 3 washing feed pipe (14) is connected to a washing feed control valve (9). The bottom flow outlet of the No. 2 washing sedimentation tank is connected to the No. 3 washing sedimentation tank and the No. 4 washing sedimentation tank through a second pipeline assembly, and the second pipeline assembly includes a slurry pipe four (17) connecting the No. 2 washing sedimentation tank and the No. 4 washing sedimentation tank, and the bottom flow pipe (7) connected to the No. 1 separation sedimentation tank is connected to the No. 4 washing feed pipe (15), and the end of the No. 4 washing feed pipe (15) is connected to the slurry pipe four (17), and the No. 4 washing feed pipe (15) is provided with a washing feed control valve (9).

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