A wide plate feeding system for a decomposition tank in alumina production

Abstract

This utility model discloses a wide plate feeding system for alumina production decomposition tanks. It includes a feed pipe, with its inlet end connected to the upper part of the decomposition tank. The feed pipe is equipped with a feed valve and a pump. A siphon pipe is connected to the feed pipe on the outlet side of the feed valve. The siphon pipe bypasses the top of the decomposition tank wall, and its end extends below the liquid surface in the decomposition tank. An air inlet pipe is connected to the siphon pipe, also bypassing the top of the decomposition tank wall, with its end extending above the liquid surface in the decomposition tank. An air inlet valve is installed on the air inlet pipe. This system uses a siphon principle for wide plate feeding, reducing wear on the feed valve from the slurry, preventing internal leakage of the feed valve, and thus avoiding the phenomenon of wide plates being crushed.

Description

Technical Field

[0001] This utility model relates to the field of alumina production, and in particular to a wide plate feeding system for a decomposition tank in alumina production. Background Technology

[0002] The feed system for the wide plate in the decomposition tank of the Bayer process alumina production includes a feed pipe with a feed pump. The feed end of the feed pipe is connected to the tank wall valve in the upper part of the decomposition tank. The feed of the wide plate is controlled by controlling the opening and closing of the tank wall valve. The frequent use of the tank wall valve accelerates valve wear and easily causes valve leakage and wide plate jamming, which has an adverse impact on production. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a wide plate feeding system for decomposition tanks in alumina production, so as to solve the technical problem of easy wear of the tank wall valves in existing wide plate feeding systems.

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

[0005] A wide-plate feeding system for a decomposition tank in alumina production includes a feed pipe, the feed end of which is connected to the upper part of the decomposition tank. The feed pipe is equipped with a feed valve and a pump. A siphon pipe is connected to the feed pipe on the discharge side of the feed valve. The siphon pipe bypasses the top of the decomposition tank wall, and the end of the siphon pipe extends below the liquid surface in the decomposition tank. An air inlet pipe is connected to the siphon pipe. The air inlet pipe bypasses the top of the decomposition tank wall, and the end of the air inlet pipe extends above the liquid surface in the decomposition tank. An air inlet valve is provided on the air inlet pipe.

[0006] Furthermore, the diameter of the siphon tube is the same as the diameter of the feed tube.

[0007] Furthermore, the height of the end of the siphon tube in the decomposition tank is consistent with the height of the inlet end of the feed tube.

[0008] Furthermore, the feed valve is DN150 in size.

[0009] Furthermore, the feed valve is located on the wall of the decomposition tank.

[0010] The beneficial effects of this utility model are:

[0011] The wide-plate feeding system for the decomposition tank in alumina production proposed in this utility model involves opening the feed valve and closing the air inlet valve during wide-plate feeding. The pump frequency is then slowly increased until the feed pipe is full of slurry. At this point, the feed valve is closed, and the slurry enters the feed pipe through a siphon to feed the wide plate. When feeding stops, the air inlet valve is opened, allowing air to enter the siphon and feed pipe, thus stopping the feeding process. This siphon feeding principle reduces wear on the feed valve from the slurry, prevents internal leakage, and avoids the wide plate becoming jammed.

[0012] 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

[0013] 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:

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] In the diagram: 1. Decomposition tank; 2. Feed valve; 3. Feed pipe; 4. Pump; 5. Siphon pipe; 6. Air inlet pipe; 7. Air inlet valve. Detailed Implementation

[0016] 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.

[0017] like Figure 1 The alumina production decomposition tank wide plate feeding system shown includes a feed valve 2 located on the upper half of the decomposition tank 1 wall. The feed valve 2 is DN150, which is smaller than the tank wall valves in existing wide plate feeding systems. The feed valve 2 is connected to a feed pipe 3, and a pump 4 is installed on the feed pipe 3. A siphon pipe 5 is connected to the feed pipe 3 on the discharge side of the feed valve 2. The diameter of the siphon pipe 5 is the same as that of the feed pipe 3. The siphon pipe 5 bypasses the top of the decomposition tank 1 wall, and its end extends 3 meters below the liquid surface in the decomposition tank 1. That is, the height of the end of the siphon pipe 5 in the decomposition tank 1 is the same as the height of the feed end of the feed pipe 3. An air inlet pipe 6 is connected to the siphon pipe 5. The air inlet pipe 6 bypasses the top of the decomposition tank 1 wall, and its end extends above the liquid surface in the decomposition tank 1 without contacting the liquid surface. An air inlet valve 7 is installed on the air inlet pipe 6.

[0018] The wide plate feeding system for the decomposition tank in alumina production proposed in this utility model involves opening the feed valve 2 and closing the air inlet valve 7 during wide plate feeding. Then, the frequency of the pump 4 is slowly increased. When the feed pipe 3 is filled with slurry, the feed valve 2 is closed, and the slurry enters the feed pipe through the siphon pipe 5 to achieve wide plate feeding. When wide plate feeding stops, the air inlet valve 7 is opened, and air enters the siphon pipe 5 and feed pipe 3 to stop feeding. The wide plate feeding uses the siphon principle, which reduces wear on the feed valve 2 from the slurry, avoids internal leakage of the feed valve 2, and thus prevents the wide plate from being crushed.

[0019] 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 decomposition tank wide plate feeding system in alumina production, comprising a feeding pipe (3), the feeding end of the feeding pipe (3) is connected to the upper half of a decomposition tank (1), the feeding pipe (3) is provided with a feeding valve (2) and a pump (4), characterized in that: A siphon pipe (5) is connected to the feed pipe (3) on the discharge side of the feed valve (2). The siphon pipe (5) bypasses the top of the wall of the decomposition tank (1). The end of the siphon pipe (5) extends into the decomposition tank (1) below the liquid surface. An air inlet pipe (6) is connected to the siphon pipe (5). The air inlet pipe (6) bypasses the top of the wall of the decomposition tank (1). The end of the air inlet pipe extends into the decomposition tank (1) above the liquid surface. An air inlet valve (7) is provided on the air inlet pipe (6).

2. The wide plate feeding system for the decomposition tank in alumina production according to claim 1, characterized in that: The diameter of the siphon (5) is the same as the diameter of the feed pipe (3).

3. The wide plate feeding system for the decomposition tank in alumina production according to claim 1 or 2, characterized in that: The height of the end of the siphon tube (5) in the decomposition tank (1) is the same as the height of the feed end of the feed tube (3).

4. The wide plate feeding system for the decomposition tank in alumina production according to claim 1, characterized in that: The feed valve (2) is DN150 in size.

5. The wide plate feeding system for the decomposition tank in alumina production according to claim 1, characterized in that: The feed valve (2) is located on the wall of the decomposition tank (1).

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