Low-power-consumption decomposition tank material passing system for aluminum oxide production

Abstract

The utility model discloses a low-power-consumption decomposition tank material passing system for alumina production, which comprises one or more air supply devices connected in parallel, a compressed air storage tank and one or more decomposition tanks, the output ends of the air supply devices are communicated with the compressed air storage tank, and the output ends of the compressed air storage tank are respectively communicated to the decomposition tanks through air supply pipelines; the air supply device is a low-pressure air supply device, a discharging pipe is arranged in the decomposing tank, and an arc-shaped flow guide plate is arranged at the lower end of the discharging pipe; the arc-shaped flow guide plate is of a dustpan-shaped special structure with a wide upper part and a narrow upper part and an arc-shaped edge; an inlet of the arc-shaped flow guide plate faces the flowing direction of materials in the decomposing tank; a communicated material lifting air pipe is arranged on the air supply pipeline, and the end of the material lifting air pipe is inserted into the discharging pipe. According to the utility model, the operation cost and construction investment of an air compression station and a circulating water system matched with a seed decomposition process can be reduced, scabs at the bottom of the decomposition tank can be effectively reduced, the cleaning difficulty of the decomposition tank is reduced, the cleaning cost is saved, and the system productivity is improved.

Description

Technical Field

[0001] This utility model relates to the field of seed decomposition technology in alumina production, specifically a low-power decomposition tank material feeding system for alumina production. Background Technology

[0002] In the alumina production process, the seed decomposition process is one of the important processes. The seed decomposition process consists of a large number of decomposition tanks connected in series. The material flow between the decomposition tanks is achieved through the discharge pipe inside the decomposition tank and the material chute connected outside the tank.

[0003] To ensure smooth material flow, a certain height difference is set between the decomposition tanks. However, a large amount of high-pressure compressed air still needs to be introduced into the discharge pipe of the decomposition tank through the lifting air pipe. Using the principle of communicating vessels, the aluminum hydroxide slurry in the discharge pipe is diluted to achieve local negative pressure, which causes the material at the bottom of the decomposition tank to overflow through the discharge pipe into the discharge chute at the top of the decomposition tank. Then, it flows by gravity through the chute to the next decomposition tank.

[0004] The main problems with conventional decomposition tank feeding systems are as follows: Due to the large feeding volume of the decomposition tank, a large amount of high-pressure compressed air needs to be introduced into the discharge pipe inside the decomposition tank. This requires a dedicated high-pressure air compressor station and a supporting circulating water station. The air compressor station usually uses multiple high-pressure screw air compressors, cooling towers, and circulating water pumps, resulting in high power consumption during equipment operation. The circulating water system causes a large amount of water and heat loss, and the equipment requires a lot of maintenance. As the air compressors work, the high-pressure compressed air is heated, and the heat from the high-temperature compressed air is carried into the decomposition tank, which has an adverse effect on the seed decomposition system.

[0005] The conventional disintegration tank discharge pipe is made by inserting the lifting air pipe into the disintegration tank discharge pipe. The insertion depth is 5-10m from the bottom of the disintegration tank and more than 30m from the top of the disintegration tank. The bottom of the discharge pipe is cut at a 45° angle.

[0006] The bottom of the decomposition tank is severely scaled, and the scale on the tank wall is more than 3 meters high. The cleaning cycle is short, requiring cleaning every 6-10 months. Each cleaning takes about 10-15 days, and the cleaning is difficult and expensive. Utility Model Content

[0007] In view of the above-mentioned disadvantages and deficiencies, the present utility model provides a low-power feed system for decomposition tanks in alumina production, which uses a low-pressure air supply device as the air source for the lifting air of the decomposition tank. By improving the discharge pipe of the decomposition tank, it can effectively reduce the operating costs and construction investments of the air compressor station and the circulating water system supporting the seed decomposition process, including one or more air supply devices connected in parallel, a compressed air storage tank, and one or more decomposition tanks. The output end of the air supply device is connected to the compressed air storage tank, and the output end of the compressed air storage tank is respectively connected to the decomposition tanks through a gas supply pipeline; the air supply device is a low-pressure air supply device, and a discharge pipe is provided inside the decomposition tank, and an arc-shaped deflector is provided at the lower end of the discharge pipe; the arc-shaped deflector is a dustpan-shaped structure with a wider upper part and a narrower lower part, and the edge is arc-shaped, and the inlet of the arc-shaped deflector faces the direction of material flow in the decomposition tank; a lifting air pipe is provided on the gas supply pipeline, and the end of the lifting air pipe is inserted into the interior of the discharge pipe.

[0008] When there are multiple decomposition tanks, each decomposition tank is connected in sequence and has a height difference.

[0009] The insertion depth of the lifting air pipe inserted into the discharge pipe of the decomposition tank is 10 - 20 meters from the top of the decomposition tank.

[0010] The air supply device includes a high-efficiency liquid-cooled air suspension blower, an air-cooled air suspension blower, a magnetic suspension blower, a Roots blower or a single-stage high-speed centrifugal blower that do not require supporting a large amount of circulating water and a cooling tower system.

[0011] The air supply device provides a set pressure range of compressed air between 0.1 - 0.3 MPa.

[0012] A fan outlet valve and a flow meter are successively provided at the outlet of the air supply device. An inlet valve is provided at the intake end of the compressed air storage tank, an outlet valve is provided at the outlet end, a safety valve is provided at the top, a drain valve is provided at the bottom, and a pressure gauge is connected to the compressed air storage tank.

[0013] The beneficial effects of the present utility model are as follows:

[0014] The present utility model is a low-power feed system for decomposition tanks in alumina production, which uses a low-pressure air supply device as the air source for the lifting air of the decomposition tank. By setting the arc-shaped deflector, the installation position of the discharge pipe of the decomposition tank and the lifting air pipe, it can effectively reduce the operating costs and construction investments of the air compressor station and the circulating water system supporting the seed decomposition process, reduce the power consumption of the seed decomposition feed system, reduce the floor area of the seed decomposition process and its supporting facilities. The present utility model can effectively reduce the scale formation at the bottom of the decomposition tank, reduce the cleaning difficulty of the decomposition tank, save the cleaning cost, effectively improve the equipment operation rate, and increase the system production capacity;

[0015] The decomposition tank of the present utility model can be replaced with a pre-desilication tank or a causticization tank in the alumina production technology field, and used in its feed system, and the same technical effects can be achieved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a low-power decomposition tank material handling system for alumina production according to this utility model.

[0017] In the diagram: 1 is a low-pressure air supply device, 2 is a compressed air storage tank, 3 is an air supply pipeline, 4 is a material lifting air pipe, 5 is a decomposition tank, 6 is a discharge pipe, 7 is an arc-shaped guide plate, 8 is the first valve, 9 is the second valve, 10 is the third valve, 11 is the fourth valve, 12 is a flow meter, and 13 is a pressure gauge. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings. Figure 1 As shown, this utility model discloses a low-power decomposition tank material feeding system for alumina production, which includes two parallel-connected low-pressure air supply devices 1, a compressed air storage tank 1, and three decomposition tanks 5. Each decomposition tank 5 is connected in sequence and has a height difference.

[0019] The low-pressure air supply device 1 can be selected from equipment such as high-efficiency liquid-cooled air suspension blowers, air-cooled air suspension blowers, magnetic suspension blowers, Roots blowers, or single-stage high-speed centrifugal blowers that do not require a large amount of circulating water and cooling tower systems. The low-pressure air supply device 1 is set to provide compressed air pressure in the range of 0.1-0.3MPa.

[0020] The decomposition tank can be a pre-desilicon tank or a causticizing tank from the field of alumina production technology.

[0021] The output end of the low-pressure air supply device 1 is connected to the compressed air storage tank 1, and the output end of the compressed air storage tank 1 is connected to the decomposition tank 5 through the air supply pipeline 3.

[0022] The low-pressure air supply device 1 is equipped with a first valve 8 and a flow meter 12 at its outlet. The compressed air storage tank 2 is equipped with a second valve 9 at its inlet end, a third valve 10 at its outlet end, a safety valve at its top, and a drain valve at its bottom. The compressed air storage tank 2 is connected to a pressure gauge 13.

[0023] The decomposition tank 5 is equipped with a discharge pipe 6, and the lower end of the discharge pipe 6 is equipped with an arc-shaped guide plate 7. The arc-shaped guide plate 7 is a scoop-shaped structure that is wider at the top and narrower at the bottom, with arc-shaped edges. The inlet of the arc-shaped guide plate 7 faces the direction of material flow in the decomposition tank. The air supply pipe 3 is equipped with a connecting lifting air pipe 4, and the end of the lifting air pipe 4 is inserted into the discharge pipe 6. The insertion depth of the lifting air pipe 4 into the discharge pipe 6 is 10-20 meters from the top of the decomposition tank 5.

[0024] During use, fill the decomposition tank with slurry, start the low-air-pressure air supply device 1, and open the first valve 8. When the pressure gauge value is between 0.1 - 0.3 MPa within the set pressure range, open the fourth valve. The slurry in the decomposition tank is stirred. Under the action of the material lifting air pipe 4 and the arc-shaped guide plate 7, the initial kinetic energy of the material entering the discharge pipe 6 can be effectively utilized to ensure smooth discharge. The slurry is smoothly transported through the discharge pipe to the next decomposition tank.

[0025] Observe the discharge condition of the material in the discharge pipe of the decomposition tank. By adjusting the opening degree of the fourth valve, ensure that the discharge flow rate of the discharge pipe is in a stable state; observe the air supply flow rate of the low-pressure air supply device 1 through the flow meter 12. The rotation speed of the low-pressure air supply device is adjusted according to the value of the compressed air pressure gauge to ensure that the compressed air pressure is between the set pressure range of 0.1 - 0.3 MPa.

[0026] The present utility model uses a low-pressure air supply device as the air source for the material lifting air in the decomposition tank. By setting the positions of the arc-shaped guide plate, the discharge pipe of the decomposition tank, and the material lifting air pipe, the operating costs and construction investments of the air compressor station and the circulating water system supporting the seed decomposition process can be effectively reduced, the power consumption of the seed decomposition material passing system can be reduced, and the floor area occupied by the seed decomposition process and its supporting facilities can be reduced; and the scaling at the bottom of the decomposition tank can be effectively reduced, the cleaning difficulty of the decomposition tank can be reduced, the cleaning cost can be saved, the equipment operation rate can be effectively improved, and the system production capacity can be increased.

[0027] The decomposition tank of the present utility model can be replaced with a pre-desilication tank or a causticization tank in the field of alumina production technology. When used in its filtration system, the same technical effects can be achieved.

[0028] Although the preferred embodiments of the present utility model have been described, those skilled in the art can make additional changes and modifications after learning the basic creative concepts; therefore, the claims should be interpreted to include the preferred embodiments and all modifications and variations that fall within the scope of the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies.

Claims

1. A low-power decomposition tank material handling system for alumina production, characterized in that, The device includes one or more air supply devices connected in parallel, a compressed air storage tank, and one or more decomposition tanks. The output end of the air supply device is connected to the compressed air storage tank, and the output end of the compressed air storage tank is connected to the decomposition tank through an air supply pipeline. The air supply device is a low-pressure air supply device. The decomposition tank is equipped with a discharge pipe, and the lower end of the discharge pipe is equipped with an arc-shaped guide plate. The arc-shaped guide plate has a scoop-shaped structure, and the inlet of the arc-shaped guide plate faces the direction of material flow in the decomposition tank. The air supply pipeline is equipped with a connecting lifting air pipe, and the end of the lifting air pipe is inserted into the discharge pipe.

2. The low-power decomposition tank material handling system for alumina production according to claim 1, characterized in that, The scoop shape is wider at the top and narrower at the bottom, with curved edges.

3. The low-power decomposition tank material handling system for alumina production according to claim 1, characterized in that, When there are multiple decomposition tanks, each decomposition tank is connected in sequence and has a height difference.

4. The low-power decomposition tank material handling system for alumina production according to claim 1, characterized in that, The material lifting air pipe is inserted into the discharge pipe of the decomposition tank at a depth of 10-20 meters from the top of the decomposition tank.

5. The low-power decomposition tank material handling system for alumina production according to claim 1, characterized in that, The air supply device includes a high-efficiency liquid-cooled air suspension blower, air-cooled air suspension blower, magnetic levitation blower, Roots blower, or single-stage high-speed centrifugal blower that does not require a large amount of circulating water and cooling tower system.

6. The low-power decomposition tank material handling system for alumina production according to claim 1, characterized in that, The air supply device provides compressed air with a set pressure range of 0.1-0.3 MPa.

7. The low-power decomposition tank material handling system for alumina production according to claim 1, characterized in that, The air supply device is equipped with a fan outlet valve and a flow meter at the outlet in sequence. The compressed air storage tank is equipped with an inlet valve at the inlet end, an outlet valve at the outlet end, a safety valve at the top, and a drain valve at the bottom. The compressed air storage tank is connected to a pressure gauge.

Images