Alumina seed crystal decomposing tank

Abstract

The utility model relates to the technical field of seed crystal decomposition tanks, and provides an aluminum oxide seed crystal decomposition tank which comprises a decomposition tank body, a steam inlet pipe is arranged on the top wall of the decomposition tank body, the bottom end of the steam inlet pipe extends to the bottom of an inner cavity of the decomposition tank body, and the top end of the steam inlet pipe is connected with a steam pipeline of an external comprehensive filter layer pipe rack. A plurality of steam nozzles are uniformly arranged on the side wall of the bottom of the steam inlet pipe; the heat exchange shell is arranged on the outer side of the bottom of the steam inlet pipe in a sleeving manner, the top end of the heat exchange shell is fixedly connected with the top wall of the inner cavity of the decomposition tank, and the bottom end of the heat exchange shell is fixedly communicated with a water guide pipe; by means of the technical scheme, the problem that in the prior art, new steam condensate water formed after new steam heat is utilized and reduced enters a circulating water discharging system to be used for red mud backwashing, and consequently high-purity new steam condensate water is not fully utilized is solved.

Description

Technical Field

[0001] This utility model relates to the field of seed crystal decomposition tank technology, specifically to an alumina seed crystal decomposition tank. Background Technology

[0002] Two-stage seed decomposition of alumina is a key production process affecting the particle size and strength of the finished alumina product. The two-stage seed decomposition of alumina requires the decomposition and crystallization of sodium aluminate solution in the seed tank. This process is most significantly affected by temperature. However, due to the large volume of the solution system in industrial production, the high-temperature sodium aluminate concentrate needs to be cooled by dual heat conduction of low-temperature mother liquor and low-temperature circulating water in the concentrate plate heat exchanger before entering the seed decomposition tank. However, it is difficult to control the temperature of the sodium aluminate concentrate solution in a timely and accurate manner using conventional plate heat exchangers. Too low a temperature will slow down the decomposition rate, while too high a temperature will cause high-impurity alumina to crystallize directly, thus affecting production efficiency and the reliability of alumina product quality. In addition, the decomposition of sodium aluminate solution in the seed decomposition tank requires the initiation of aluminum hydroxide fine seeds in the seed tank. There are a certain amount of impurities in the fine seeds. After being pumped into the seed decomposition tank together with the fine seeds, the impurities cover the active sites on the surface of the seed seeds and interfere with the recrystallization of sodium aluminate after decomposition. Therefore, the fine seeds need to be washed and impurities removed before being pumped into the seed decomposition tank.

[0003] Washing and removing impurities from fine seeds generally requires controlling the washing temperature between 50 and 70°C. Considering the entire alumina production process, it is worth noting that in the previous sodium aluminate evaporation and concentration step, fresh steam was introduced to promote the evaporation and concentration of the sodium aluminate solution. After the heat of the fresh steam was utilized and reduced, the resulting fresh steam condensate entered the circulating water system for red mud backwashing. This resulted in insufficient utilization of the high-purity fresh steam condensate. Therefore, research on the utilization method of fresh steam condensate for washing fine seeds is a process optimization direction that is beneficial for water and energy conservation. Utility Model Content

[0004] This invention proposes an alumina seed decomposition tank, which solves the problem in related technologies where the condensate formed after the heat of the new steam is reduced is used to enter the circulating water system for red mud backwashing, resulting in insufficient utilization of the high-purity new steam condensate.

[0005] The technical solution of this utility model is as follows:

[0006] Alumina seed decomposition tank, including:

[0007] The decomposition tank has a steam inlet pipe installed on its top wall. The bottom end of the steam inlet pipe extends to the bottom of the inner cavity of the decomposition tank. The top end of the steam inlet pipe is connected to the steam pipe of the external integrated filter layer pipe rack. Several steam nozzles are evenly installed on the bottom side wall of the steam inlet pipe.

[0008] A heat exchange shell is sleeved on the bottom outside of the steam inlet pipe. The top of the heat exchange shell is fixedly connected to the top wall of the inner cavity of the decomposition tank, and the bottom of the heat exchange shell is fixedly connected to a water guide pipe.

[0009] A fine seed tank is fixed to the front side of the decomposition tank. A spray pipe is installed inside the fine seed tank. Several water nozzles are evenly arranged on the bottom wall of the spray pipe. An installation plate is fixed to one side of the fine seed tank. A pipeline pump is fixed on the installation plate. The inlet of the pipeline pump is connected to the bottom of the inner cavity of the fine seed tank through a connecting pipe. The outlet of the pipeline pump is connected to the inside of the decomposition tank through a connecting pipe.

[0010] An insulated water tank is fixed to one side of the fine crystal seed tank. A water pump is fixed to the top wall of the insulated water tank. The inlet of the water pump is connected to the bottom of the inner cavity of the insulated water tank through a connecting pipe. The outlet of the water pump is connected to the spray pipe inside the fine crystal seed tank through a connecting pipe. One end of the water guide pipe is connected to the inside of the insulated water tank.

[0011] Preferably, a plurality of heat dissipation fins are uniformly fixed on the outer wall of the heat exchange shell.

[0012] Preferably, the distance between the lowest steam nozzle and the bottom wall of the decomposition tank is 50cm, the distance between the highest steam nozzle and the bottom wall of the decomposition tank is 3m, and the distance between adjacent steam nozzles is 50cm.

[0013] Preferably, the spray pipe is shaped like a mosquito coil.

[0014] Preferably, the outer sides of the water pipe and the connecting pipe are both fitted with rock wool and polyurethane foam insulation materials.

[0015] Preferably, a ball valve is installed on the steam inlet pipe, and the ball valve is located above the top wall of the decomposition tank.

[0016] Preferably, a temperature sensor is installed on the inner wall of the fine seed tank.

[0017] Preferably, it also includes a controller, which is signal-connected to the temperature sensor and the water pump.

[0018] The beneficial effects of this utility model are as follows:

[0019] In this invention, a steam inlet pipe is installed to connect the steam pipeline to the external integrated filter layer pipe rack, allowing steam to be introduced into the decomposition tank. The heat in the steam is exchanged with the leaching slurry entering the decomposition tank through a heat exchange shell. The resulting high-temperature condensate is stored in an insulated water tank through a water guide pipe. The high-temperature steam condensate is then connected to the fine seed tank through the water guide pipe. In conjunction with a temperature sensor and controller, the high-temperature fresh steam condensate circulation pipeline can regulate the washing temperature of the fine seeds, improve the washing purity of the fine seeds, and enhance water-saving efficiency and the decomposition and crystallization effect of sodium aluminate. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a perspective view of the external structure of this utility model;

[0022] Figure 2 This is a three-dimensional view of the internal structure of the decomposition tank of this utility model;

[0023] Figure 3 This is a three-dimensional view of the internal structure of the heat exchange shell of this utility model;

[0024] Figure 4 This is a three-dimensional view of the internal structure of the fine-grained seed groove of this utility model;

[0025] Figure 5 This is a perspective view of the external structure of the spray pipe of this utility model.

[0026] In the diagram: 1. Decomposition tank; 2. Steam inlet pipe; 3. Ball valve; 4. Steam nozzle; 5. Heat exchange shell; 6. Insulated water tank; 7. Fine crystal seed tank; 8. Water guide pipe; 9. Water pump; 10. Mounting plate; 11. Pipeline pump; 12. Spray pipe; 13. Water outlet nozzle; 14. Heat dissipation fins. Detailed Implementation

[0027] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0028] Example 1

[0029] like Figures 1-5 As shown, this embodiment proposes:

[0030] Alumina seed decomposition tank, including:

[0031] The decomposition tank 1 has a steam inlet pipe 2 installed on its top wall. The bottom end of the steam inlet pipe 2 extends to the bottom of the inner cavity of the decomposition tank 1. The top end of the steam inlet pipe 2 is connected to the steam pipe of the external integrated filter layer pipe rack. Several steam nozzles 4 are evenly installed on the bottom side wall of the steam inlet pipe 2.

[0032] Heat exchange shell 5 is sleeved on the bottom outside of steam inlet pipe 2. The top of heat exchange shell 5 is fixedly connected to the top wall of the inner cavity of decomposition tank 1, and the bottom of heat exchange shell 5 is fixedly connected to water guide pipe 8.

[0033] A fine crystal seed tank 7 is fixed to the front side of the decomposition tank 1. A spray pipe 12 is installed inside the fine crystal seed tank 7. Several water outlet nozzles 13 are evenly arranged on the bottom wall of the spray pipe 12. An installation plate 10 is fixed to one side of the fine crystal seed tank 7. A pipeline pump 11 is fixed on the installation plate 10. The inlet of the pipeline pump 11 is connected to the bottom of the inner cavity of the fine crystal seed tank 7 through a connecting pipe. The outlet of the pipeline pump 11 is connected to the inside of the decomposition tank 1 through a connecting pipe.

[0034] The insulated water tank 6 is fixed to one side of the fine crystal seed tank 7. A water pump 9 is fixed to the top wall of the insulated water tank 6. The inlet of the water pump 9 is connected to the bottom of the inner cavity of the insulated water tank 6 through a connecting pipe. The outlet of the water pump 9 is connected to the spray pipe 12 inside the fine crystal seed tank 7 through a connecting pipe. One end of the water guide pipe 8 is connected to the inside of the insulated water tank 6.

[0035] Several heat dissipation fins 14 are evenly fixed on the outer wall of the heat exchange shell 5.

[0036] The distance between the lowest steam nozzle 4 and the bottom wall of the inner cavity of the decomposition tank 1 is 50cm, the distance between the highest steam nozzle 4 and the bottom wall of the inner cavity of the decomposition tank 1 is 3m, and the distance between adjacent steam nozzles 4 is 50cm.

[0037] The spray pipe 12 is shaped like a mosquito coil.

[0038] Rock wool and polyurethane foam insulation materials are installed on the outside of the water pipe 8 and the connecting pipe.

[0039] A ball valve 3 is installed on the steam inlet pipe 2, and the ball valve 3 is located above the top wall of the decomposition tank 1.

[0040] A temperature sensor is installed on the inner wall of the fine seed cell 7.

[0041] It also includes a controller, which is connected to a temperature sensor and a water pump 9.

[0042] In this embodiment, steam is introduced into the decomposition tank 1 through a steam inlet pipe 2 connected to the steam pipe rack of the external integrated filter layer. The heat in the steam is exchanged with the leaching slurry entering the decomposition tank 1 through a heat exchange shell 5. At this time, high-temperature condensate is generated and enters the insulated water tank 6 through a water guide pipe 8 for storage. A temperature sensor is set to detect the temperature in the fine seed tank 7. When the temperature is lower than the preset suitable washing temperature, the controller will control the water pump 9 to work. The water pump 9 draws the high-temperature condensate in the insulated water tank 6 into the spray pipe 12 and sprays it out through the water outlet nozzle 13 to uniformly spray and wash the aluminum hydroxide fine seeds in the fine seed tank 7, so that the washing temperature of the fine seeds is within a suitable range, improving water and energy saving efficiency. The washed fine seeds are pumped to the decomposition tank 1 through a pipeline. At the same time, the connecting pipe is equipped with insulation materials such as rock wool and polyurethane foam to avoid temperature fluctuations of the fine seeds during transportation, which would lead to uneven particle size of sodium aluminate decomposition crystals. Meanwhile, in this embodiment, the other inlets and outlets on the decomposition tank 1 and the fine seed tank 7 are not shown or described in detail, as they are conventional setups in the art. Additionally, the heat dissipation fins 14 on the outside of the heat exchange shell 5 can accelerate the heat exchange efficiency of steam, and the spray pipe 12 is arranged in a mosquito coil shape, ensuring that the high-temperature condensate is sprayed evenly during the spraying process.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An alumina seed decomposition tank, characterized in that, include: The decomposition tank (1) is equipped with a steam inlet pipe (2) on its top wall. The bottom end of the steam inlet pipe (2) extends to the bottom of the inner cavity of the decomposition tank (1). The top end of the steam inlet pipe (2) is connected to the steam pipe of the external integrated filter layer pipe rack. Several steam nozzles (4) are evenly installed on the bottom side wall of the steam inlet pipe (2). Heat exchange shell (5), the heat exchange shell (5) is sleeved on the bottom outside of the steam inlet pipe (2), the top of the heat exchange shell (5) is fixedly connected to the top wall of the inner cavity of the decomposition tank (1), and the bottom of the heat exchange shell (5) is fixedly connected to the water guide pipe (8). A fine crystal seed tank (7) is fixed to the front side of the decomposition tank (1). A spray pipe (12) is installed inside the fine crystal seed tank (7). Several water nozzles (13) are evenly arranged on the bottom wall of the spray pipe (12). An installation plate (10) is fixed on one side of the fine crystal seed tank (7). A pipeline pump (11) is fixed on the installation plate (10). The inlet of the pipeline pump (11) is connected to the bottom of the inner cavity of the fine crystal seed tank (7) through a connecting pipe. The outlet of the pipeline pump (11) is connected to the inside of the decomposition tank (1) through a connecting pipe. A water tank (6) is fixed to one side of the fine crystal seed tank (7). A water pump (9) is fixed to the top wall of the water tank (6). The inlet of the water pump (9) is connected to the bottom of the inner cavity of the water tank (6) through a connecting pipe. The outlet of the water pump (9) is connected to the spray pipe (12) inside the fine crystal seed tank (7) through a connecting pipe. One end of the water guide pipe (8) is connected to the inside of the water tank (6).

2. The alumina seed decomposition tank according to claim 1, characterized in that, The outer wall of the heat exchange shell (5) is uniformly fixed with several heat dissipation fins (14).

3. The alumina seed decomposition tank according to claim 1, characterized in that, The distance between the lowest steam nozzle (4) and the bottom wall of the decomposition tank (1) is 50cm, the distance between the highest steam nozzle (4) and the bottom wall of the decomposition tank (1) is 3m, and the distance between adjacent steam nozzles (4) is 50cm.

4. The alumina seed decomposition tank according to claim 1, characterized in that, The spray pipe (12) is shaped like a mosquito coil.

5. The alumina seed decomposition tank according to claim 1, characterized in that, The outer sides of the water pipe (8) and the connecting pipe are both fitted with rock wool and polyurethane foam insulation materials.

6. The alumina seed decomposition tank according to claim 1, characterized in that, A ball valve (3) is installed on the steam inlet pipe (2), and the ball valve (3) is located above the top wall of the decomposition tank (1).

7. The alumina seed decomposition tank according to claim 1, characterized in that, A temperature sensor is installed on the inner wall of the fine seed cell (7).

8. The alumina seed decomposition tank according to claim 7, characterized in that, It also includes a controller that is signal-connected to the temperature sensor and the water pump (9).

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