Alumina impurity removal apparatus

Abstract

The application provides an alumina impurity removal device, which comprises a first linear vibrating screen, an intermediate chute, a second sand setting chute, a discharge chute and a third circular vibrating screen, the first linear vibrating screen is provided below with the intermediate chute, the intermediate chute is connected with the second sand setting chute at the back, the second sand setting chute is connected with the discharge chute at the back, and the second sand setting chute is connected with the third circular vibrating screen below. The three-stage impurity removal system can automatically remove impurities, effectively separates various sizes of particle impurities, prevents the screen from being blocked, and improves the purity of the alumina.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of alumina purification, and particularly relates to a device for removing impurities and slag from alumina powder. BACKGROUND

[0002] Electrolytic aluminum production uses alumina as raw material. In the production and transportation process of alumina, due to the processes of calcination, conveying, stacking, packaging, transportation and storage, packaging fragments, stone blocks, iron slag, sand and alumina slag blocks are mixed in the alumina. Before being sent into an electrolysis workshop, the mixed materials need to be removed, otherwise the conveying pipeline and chute will be blocked, and the conveying and production will be affected. The traditional device for removing impurities and slag is a simple slag removal filter screen or a pneumatic suspension technology for screening. The screened impurities contain more impurities, and the screening effect needs to be further improved. SUMMARY

[0003] In view of the above technical problems, the application provides an alumina impurity removal device.

[0004] In order to achieve the above purpose, the technical scheme of the application is as follows:

[0005] An alumina impurity removal device comprises a first linear vibrating screen, an intermediate chute, a second sand setting chute, a discharge chute and a third circular vibrating screen. The first linear vibrating screen is provided below with the intermediate chute, the intermediate chute is connected behind with the second sand setting chute, the second sand setting chute is connected behind with the discharge chute, and the second sand setting chute is connected below with the third circular vibrating screen.

[0006] The first linear vibrating screen comprises a shell A provided with a feeding port A and a discharge port A, and a screen A is installed inside the shell A and located between the feeding port A and the discharge port A. A slag discharge port is arranged on one side of the shell A and communicates with a space above the screen A for discharging slag.

[0007] The feeding port A is connected with the shell A through a flexible joint A, and the slag discharge port is connected with a slag discharge pipe through a flexible joint B.

[0008] The intermediate chute comprises a chute body A provided at one end with a blocking plate and at the other end with a discharge port B. The chute body A is connected at the top with the first linear vibrating screen through a feeding port B. The bottom of the chute body A is provided with a gas permeable plate A, and a gas charging box A is arranged below the gas permeable plate A. The gas charging box A is connected with an air inlet pipe A, and the air inlet pipe A is provided with a pneumatic ball valve.

[0009] The feeding port B is connected with the discharge port A.

[0010] The secondary sand setting chute comprises a chute body B, the inlet end of the chute body B is connected with a discharge port B, the outlet end is provided with a discharge port C and a sand discharge elbow, and the discharge port C is located above the sand discharge elbow; the discharge port C is connected with a discharge chute; the sand discharge elbow is connected with a three-stage circular vibrating screen; a ventilation plate B is arranged below the chute body B, a gas charging box B is arranged below the ventilation plate B, and a gas inlet pipe B is arranged on the gas charging box B.

[0011] The inlet end of the secondary sand setting chute is lower than the outlet end, and the ventilation plate B is arranged obliquely from the inlet end to the outlet end.

[0012] The three-stage circular vibrating screen comprises a shell B, the shell B is provided with a feeding port C and a discharge port D, the shell B is internally provided with a screen B, and the screen B is located between the feeding port C and the discharge port D; a sand discharge port is formed in the side surface of the shell B and communicates with the space above the screen B.

[0013] The feeding port C is connected with the sand discharge elbow, and a pneumatic butterfly valve is arranged between the feeding port C and the sand discharge elbow.

[0014] The shell A is provided with a vibrating motor A for driving the screen A to vibrate, the vibrating motor A is connected with the screen A; the shell B is provided with a vibrating motor B for driving the screen B to vibrate, the vibrating motor B is connected with the screen B; and the mesh number of the screen B is greater than that of the screen A.

[0015] The beneficial effects of the present application are as follows: the impurity-containing aluminum oxide is subjected to primary separation in the first-stage linear vibrating screen, and large-particle impurities can be removed in advance; the aluminum oxide powder containing a small amount of small particles falls into the intermediate chute, the aluminum oxide powder continues to enter the sand setting chute under the action of gas in the intermediate chute, under the action of gas in the sand setting chute, the aluminum oxide floats on the upper layer due to small density, and the small-particle impurities with large density sink to the bottom, the pneumatic valve at the lower part of the discharge section of the sand setting chute is opened periodically, and the small-particle impurities are discharged through secondary separation, but a small amount of aluminum oxide powder is still mixed in the small-particle impurities, the mixture is dropped into the three-stage circular vibrating screen, the small-particle impurities are separated out through three times of fine screening in the circular vibrating screen, and the pure aluminum oxide collected below the screen is returned to the subsequent system; the pure aluminum oxide separated out in the sand setting chute enters the discharge chute through the discharge port located at the upper part of the sand setting chute. The three-stage impurity removal system can automatically remove impurities, effectively separate particles of various sizes, prevent the screen from being blocked, and improve the purity of the aluminum oxide. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative labor.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] In the diagram: 1. Primary linear vibrating screen; 2. Intermediate chute; 3. Secondary sand settling chute; 4. Discharge chute; 5. Tertiary circular vibrating screen; 6. Feed inlet A1-1; 7. Flexible joint A1-2; 8. Top cover 1-3; 9. Shell A1-4; 10. Screen A1-5; 11. Vibrating motor A1-6; 11. Discharge outlet A1-7; 12. Slag discharge outlet 1-8; 13. Flexible connector B1-9; 14. Slag discharge pipe 1-10; 15. Feed inlet B2-1; 26. Blocking plate 2-2; 37. Tank body A2-3; 48. Ventilation plate A2 -4, Air box A2-5, Pneumatic ball valve 2-6, Air inlet pipe A2-7, Discharge port B2-8, Tank B3-1, Ventilation plate B3-2, Air box B3-3, Air inlet pipe B3-4, Discharge port C3-5, Sand discharge bend 3-6, Pneumatic butterfly valve 3-7, Inlet C5-1, Shell B5-2, Screen B5-3, Discharge port D5-4, Vibrating motor B5-5, Support 5-6, Sand discharge port 5-7. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1

[0021] An alumina impurity removal device, such as Figure 1 As shown, the system includes: a primary linear vibrating screen 1, an intermediate chute 2, a secondary settling chute 3, a discharge chute 4, and a tertiary circular vibrating screen 5. The intermediate chute 2 is located below the primary linear vibrating screen 1. The secondary settling chute 3 is connected to the intermediate chute 2, and the discharge chute 4 is located behind the secondary settling chute 3. The tertiary circular vibrating screen 5 is connected below the secondary settling chute 3. Alumina powder first enters the primary linear vibrating screen 1. The alumina powder that has passed the initial screening enters the intermediate chute 2 located below the primary linear vibrating screen 1 under the influence of gravity. The intermediate chute 2 transports the alumina powder to the secondary settling chute 3 for secondary separation. The purified alumina is then transported to the discharge chute 4 located behind the secondary settling chute 3. The alumina containing impurities enters the tertiary circular vibrating screen 5 located below the secondary settling chute 3 under the influence of gravity for further screening and impurity removal.

[0022] Example 2

[0023] An alumina impurity removal device, such as Figure 1As shown, the difference between the embodiment 1 is that the primary linear vibrating screen 1 comprises a shell, the feed port A1-1 is located at the top of the shell A1-4, the discharge port A1-7 is located at the bottom of the shell A1-4, the shell A1-4 is internally provided with a screen A1-5, a residue discharge port 1-8 is formed in the sidewall of the shell A1-4 above the screen A1-5, a vibrating motor A1-6 for driving the screen A1-5 to vibrate is mounted on the shell A1-4, and the vibrating motor A1-6 is connected with the screen A1-5. The impurity-containing alumina is subjected to primary screening in the primary linear vibrating screen 1 through the screen A1-5, the alumina powder is discharged from the discharge port A1-7 after passing through the screen A1-5, and the large-particle impurities are left on the coarse screen A1-5 and are discharged to a designated position through the residue discharge port 1-8 and a residue discharge pipe 1-10 under the action of vibration.

[0024] Embodiment 3

[0025] An alumina impurity removal device, as shown in Figure 1 As shown, the difference between the embodiment 2 is that the intermediate chute 2 comprises a chute body A2-3, one end of the chute body A2-3 is provided with a blocking plate 2-2, and the other end is provided with a discharge port B2-8; the chute body A2-3 is connected with the primary linear vibrating screen 1 through a feed port B2-1 at the top of the chute body A2-3; the chute body A2-3 is provided with a gas permeable plate A2-4 at the bottom, and a gas charging box A2-5 is arranged below the gas permeable plate A2-4, the gas charging box A2-5 is connected with an air inlet pipe A2-7, and a pneumatic ball valve 2-6 is arranged on the air inlet pipe A. The alumina powder separated from the primary linear vibrating screen 1 continues to flow into the secondary sand setting chute 3 under the action of gas in the intermediate chute 2, and the intermediate chute 2 mainly functions to transfer the alumina powder.

[0026] Embodiment 4

[0027] An alumina impurity removal device, as shown in Figure 1As shown, the difference between this and Embodiment 3 is that the secondary sedimentation chute 3 includes a trough body B3-1. The inlet end of the trough body B3-1 is connected to the outlet B2-8, and the outlet end is provided with an outlet C3-5 and a sand discharge bend 3-6, with the outlet C3-5 located above the sand discharge bend 3-6. The outlet C3-5 is connected to the discharge chute 4. The sand discharge bend 3-6 is connected to the tertiary circular vibrating screen 5. Below the trough body B3-1 is a permeable plate B3-2, and below the permeable plate B3-2 is an air filling box B3-3, with an air inlet pipe B3-4 connected to the air filling box B3-3. The inlet end of the secondary sedimentation chute 3 is lower than the outlet end, and the permeable plate B3-2 slopes downward from the inlet end to the outlet end. Alumina powder enters the secondary settling chute 3 through the intermediate chute 2. Under the pneumatic action of the air chamber B3-3, the material reaches a fluidized state. In this state, alumina floats on the upper layer of the tank B3-1 due to its low density, while small particles of impurities sink to the bottom of the tank B3-1 due to their high density. The pure alumina flows into the subsequent system through the discharge chute 4 at the upper end of the secondary settling chute 3. Small particles of impurities and a small amount of alumina powder are discharged by periodically opening the pneumatic butterfly valve 3-7 at the lower part of the sand discharge bend 3-6.

[0028] Example 5

[0029] An alumina impurity removal device, such as Figure 1 As shown, the difference between this and Embodiment 4 is that the three-stage circular vibrating screen 5 includes a housing B5-2, with an inlet C5-1 and an outlet D5-4 on the housing B5-2. The inlet C5-1 is located at the top of the housing and is connected to the secondary settling chute 3, and a pneumatic butterfly valve 3-7 is installed between the inlet C5-1 and the secondary settling chute 3. A screen B5-3 is provided inside the housing B5-2, and the screen B5-3 is located between the inlet C5-1 and the outlet D5-4. The outlet is located on the side of the housing B5-2 below the screen B5-3, and a sand discharge port 5-7 is opened on the side of the housing B5-2 above the screen B5-3. A vibrating motor B5-5 is installed on the housing B5-2 to drive the screen B5-3 to vibrate. The vibrating motor B5-5 is connected to the screen B5-3, and the mesh count of the screen B5-5 is greater than that of the screen A1-5. A support 5-6 is installed at the bottom of the housing B5-2 to facilitate the fixation of the machine. By periodically opening the pneumatic butterfly valve 3-7, small particles and a small amount of alumina powder in the secondary sedimentation chute 3 are allowed to enter the tertiary circular vibrating screen 5. Under the action of the vibrating motor B5-5, the screen B5-3 separates the pure alumina powder and small particles. The impurities are discharged from the sand discharge port 5-7 at the upper edge of the screen B5-3, and the alumina powder is discharged from the discharge port D5-4 at the lower edge of the screen B5-3. After collection, it is returned to the subsequent system.

[0030] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An alumina impurity removal device, characterized in that, include: The system includes a primary linear vibrating screen (1), an intermediate chute (2), a secondary sand settling chute (3), a discharge chute (4), and a tertiary circular vibrating screen (5). The primary linear vibrating screen (1) is provided with an intermediate chute (2) below it. The secondary sand settling chute (3) is connected to the rear of the intermediate chute (2). The discharge chute (4) is connected to the rear of the secondary sand settling chute (3). The tertiary circular vibrating screen (5) is connected to the lower part of the secondary sand settling chute (3). The intermediate chute (2) includes a trough body A (2-3), one end of which is provided with a blocking plate (2-2) and the other end with a discharge port B (2-8); the top of the trough body A (2-3) is connected to the first-stage linear vibrating screen (1) through the feed port B (2-1); the bottom of the trough body A (2-3) is provided with a permeable plate A (2-4), and an air filling box A (2-5) is provided below the permeable plate A (2-4); an air inlet pipe A (2-7) is connected to the air filling box A (2-5), and a pneumatic ball valve (2-6) is provided on the air inlet pipe A (2-7); The secondary sedimentation chute (3) includes a trough body B (3-1), the inlet end of which is connected to the outlet B (2-8), and the outlet end is provided with an outlet C (3-5) and a sand discharge bend (3-6), with the outlet C (3-5) located above the sand discharge bend (3-6); the outlet C (3-5) is connected to the discharge chute (4); the sand discharge bend (3-6) is connected to the tertiary circular vibrating screen (5); a permeable plate B (3-2) is provided below the trough body B (3-1), and an air filling box B (3-3) is provided below the permeable plate B (3-2), with an air inlet pipe B (3-4) provided on the air filling box B (3-3); The inlet end of the secondary sedimentation chute (3) is lower than the outlet end, and the permeable plate B (3-2) is inclined from the inlet end to the outlet end; The three-stage circular vibrating screen (5) includes a shell B (5-2), a feed inlet C (5-1) and a discharge outlet D (5-4) on the shell B (5-2), a screen B (5-3) inside the shell B (5-2), and the screen B (5-3) is located between the feed inlet C (5-1) and the discharge outlet D (5-4); a sand discharge port (5-7) is opened on the side of the shell B (5-2) and communicates with the space above the screen B (5-3); The primary linear vibrating screen (1) includes a shell A (1-4) with a feed inlet A (1-1) and a discharge outlet A (1-7). The feed inlet B (2-1) is flexibly connected to the discharge outlet A (1-7).

2. The alumina impurity removal device according to claim 1, characterized in that, The shell A (1-4) is equipped with a screen A (1-5) inside, and the screen A (1-5) is located between the feed inlet A (1-1) and the discharge outlet A (1-7); a slag discharge port (1-8) is provided on one side of the shell A (1-4), and the slag discharge port (1-8) is connected to the space above the screen A (1-5) for slag discharge.

3. The alumina impurity removal device according to claim 2, characterized in that, The feed inlet A (1-1) is connected to the shell A (1-4) via a flexible connector A (1-2), and the slag discharge port (1-8) is connected to the slag discharge pipe (1-10) via a flexible connector B (1-9).

4. The alumina impurity removal device according to claim 3, characterized in that, The feed inlet C (5-1) is connected to the sand discharge bend (3-6), and a pneumatic butterfly valve (3-7) is installed between the feed inlet C (5-1) and the sand discharge bend (3-6).

5. The alumina impurity removal device according to claim 4, characterized in that, The housing A (1-4) is equipped with a vibration motor A (1-6) that drives the screen A (1-5) to vibrate, and the vibration motor A (1-6) is connected to the screen A (1-5); the housing B (5-2) is equipped with a vibration motor B (5-5) that drives the screen B (5-3) to vibrate, and the vibration motor B (5-5) is connected to the screen B (5-3); and the mesh count of the screen B (5-3) is greater than that of the screen A (1-5).

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