Electrolytic flue gas purification device capable of separating primary reaction aluminum oxide and secondary reaction aluminum oxide

Abstract

The electrolysis flue gas purification device comprises a box body and a filtering mechanism arranged in the box body, the lower portion of the box body is connected with a power separator and a boiling bed, a boiling bed partition plate is arranged in the boiling bed and used for dividing the interior of the boiling bed into a left space and a right space, and the left space and the right space are communicated through the power separator. The right side space of the boiling bed is communicated with the inner space of the box body and is connected with an inlet of the power separator through a circulating material distribution mechanism; an alumina outlet of the power separator is communicated with the left space of the boiling bed. Small-particle low-fluorine-carrying-concentration primary reaction aluminum oxide falling off from the filtering mechanism enters the right side of the fluidized bed partition plate and reacts with high-fluorine-containing flue gas through the circulating distribution mechanism, and large-particle high-fluorine-carrying-concentration secondary reaction aluminum oxide separated by the power separator enters the left side of the fluidized bed partition plate. The purpose of distinguishing primary and secondary reaction aluminum oxide is achieved, the fluorine removal efficiency is improved, blackening and hardening of circulating dead materials are avoided, and the fluorine-loaded aluminum oxide is uniform and stable in fluorine-loaded aluminum.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic aluminum fume purification, in particular to an electrolytic fume purification device capable of separating primary and secondary reaction aluminum oxide. Background Art

[0002] The electrolytic aluminum production process requires the addition of fluoride salt as a solvent for fluoride-containing alumina. The high temperature causes the fluoride salt to react with water to produce a large amount of fluoride gas and dust. Fresh alumina needs to be added to the electrolytic flue gas purification system to react with fluoride to adsorb fluoride. In order to ensure the complete removal of fluoride, fresh alumina needs to be continuously added to the purification system, and the fresh alumina needs to react with the flue gas after separation by the filter bag. The traditional purification system adds fresh alumina and fluoride-containing alumina separated by the filter bag into the ascending flue together, and does not make full use of the different reaction characteristics of fresh alumina and fluoride-containing alumina, resulting in low purification efficiency, large resistance of the ascending flue, and high power consumption of the purification system. The most important thing is that it is impossible to distinguish between single-cycle and multiple-cycle alumina, causing some alumina to become black and sticky after multiple reactions with the flue gas, and the fluorine content of the fluoride-containing alumina returned to the fluoride-containing alumina warehouse is uneven, which makes the electrolytic cell prone to effects that are unfavorable to electrolytic production. Summary of the invention

[0003] In view of the above-mentioned technical problems, the utility model proposes an electrolytic flue gas purification device that can separate primary and secondary reaction alumina, which is used to solve the problem that the electrolytic flue gas purification device in the prior art cannot distinguish between primary and multiple cycle alumina, causing some alumina to become black and sticky after multiple reactions with the flue gas.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] An electrolytic flue gas purification device capable of separating primary and secondary reaction alumina comprises a box body and a filtering mechanism arranged in the box body, a power separator and a fluidized bed are connected to the lower part of the box body, a fluidized bed partition is arranged in the fluidized bed for dividing the fluidized bed into two spaces on the left and right, the right side space of the fluidized bed is connected to the internal space of the box body, and the right side space of the fluidized bed is connected to the inlet of the power separator through a circulating material distribution mechanism; the alumina outlet of the power separator is connected to the left side space of the fluidized bed. The small particles of primary reaction alumina with low fluorine concentration dropped by the filtering mechanism of the utility model enter the right side of the fluidized bed partition, enter the power separator through the circulating material distribution mechanism, and the large particles of secondary reaction alumina with high fluorine concentration separated enter the left side of the fluidized bed partition, so as to achieve the purpose of distinguishing primary and secondary reaction alumina, improve the defluorination efficiency, avoid the blackening of circulating dead materials, and make the fluorine-containing alumina and fluorine-containing aluminum uniform and stable.

[0006] Furthermore, a material baffle is provided at the lower part of the box body, and the material baffle is located above the left side space of the fluidized bed to prevent dust in the box body from falling into the left side space of the fluidized bed.

[0007] Furthermore, the circulating material distribution mechanism includes a circulating chute connected to the right space of the fluidized bed and a return box connected to the circulating chute, and the return box is connected to the inlet of the power separator.

[0008] Furthermore, the circulation chute is connected to the return box via a circulation distributor.

[0009] Furthermore, the circulation chute is connected to the fluidized bed via a flange; the circulation distributor is connected to the circulation chute via a flange.

[0010] Furthermore, the circulating distributor is provided with a plurality of inclined feed pipes, and the feed pipes are connected to the return box.

[0011] Furthermore, an arc-shaped guide plate is provided in the power separator for guiding the separated alumina into the alumina outlet and then into the left side space of the fluidized bed.

[0012] Furthermore, a fresh chute and an air lift pump are connected to the lower part of the box body for delivering new alumina into the box body.

[0013] Furthermore, the left side space of the fluidized bed is connected with a return chute.

[0014] Furthermore, a blowing assembly is connected to the top of the box.

[0015] Beneficial effects of the utility model:

[0016] 1. The utility model uses a spraying assembly to spray small particles of low fluorine-containing primary reaction alumina into the right side of the fluidized bed partition, and then enters the return box through a circulation chute and a circulation distributor to react with the high-fluorine-containing flue gas from the flue of the electrolytic cell. The large particles of high fluorine-containing secondary reaction alumina separated by a power separator enter the left side of the fluidized bed partition, and then are sent to the fluorine-containing alumina bin by the return chute for electrolysis, thereby achieving the purpose of distinguishing primary and secondary reaction alumina, improving the defluorination efficiency, avoiding the blackening of circulating dead materials, and making the fluorine-containing alumina uniform and stable.

[0017] 2. The utility model uses a baffle plate to block the sprayed low-fluorine-loaded alumina so that it enters the right side of the fluidized bed partition;

[0018] 3. The utility model uses a fluidized bed partition to distinguish alumina with high fluorine concentration and alumina with low fluorine concentration;

[0019] 4. The utility model sprays fresh alumina into the bottom of the filter bag through an air lift pump, and reacts with the low-fluorine flue gas from the power separator to improve the purification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the cross section of AA.

[0023] In the figure: 1-return chute; 2-air lift pump; 3-fresh chute; 4-fluidized bed; 5-return box; 6-circulation distributor; 7-circulation chute; 8-power separator; 9-middle box; 10-upper box; 11-material baffle; 12-fluidized bed partition; 13-blowing assembly. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] like Figure 1 and Figure 2As shown, an electrolytic flue gas purification device capable of separating primary and secondary reaction alumina described in Example 1 of the utility model comprises a box body and a filtering mechanism arranged in the box body. In this embodiment, the box body comprises an upper box body 10, a middle box body 9 and a lower box body 14; the filtering mechanism adopts a plurality of filter bags, and the filter bags are arranged in the middle box body 9. The middle box body 9 is connected to a power separator 8, and the lower end of the lower box body 14 is connected to a fluidized bed 4. A fluidized bed partition 12 is provided in the fluidized bed 4 for dividing the fluidized bed 4 into two left and right spaces. The right side space of the fluidized bed 4 is connected to the internal space of the box body to receive dust dropped from the filter bag, and one side of the right side space of the fluidized bed 4 is connected to the inlet of the power separator 8 through a circulating cloth mechanism. The right side space of the fluidized bed 4 boils the dust, and the fluorine-containing flue gas carries the low-fluorine-loaded primary reaction alumina coming out of the right side space of the fluidized bed 4 into the power separator 8 for gas-solid separation. The flue gas outlet of the power separator 8 is connected to the box body through the upper right space of the fluidized bed 4, so that the flue gas after gas-solid separation enters the middle box body 9. The alumina outlet of the power separator 8 is connected to the left space of the fluidized bed 4, so that the high-fluorine-loaded secondary reaction alumina enters the left side of the fluidized bed partition 12.

[0026] In addition, a blowing assembly 13 is connected to the top of the box body for blowing the dust on the filter bag down and dropping it into the fluidized bed on the right side of the fluidized bed partition 12.

[0027] Furthermore, if Figure 2 As shown, a baffle plate 11 is provided at the lower part of the lower box 14 , and the baffle plate 11 is located above the left side space of the fluidized bed 4 to prevent dust in the box from falling into the left side space of the fluidized bed 4 .

[0028] Embodiment 2 is different from Embodiment 1 in that Figure 1 As shown, the circulating material distribution mechanism includes a circulating chute 7 connected to the right space of the fluidized bed 4 and a return box 5 connected to the circulating chute 7. The lower end of the return box 5 is connected to the flue of the electrolytic cell so that the high-fluorine flue gas enters the return box 5. The upper end of the return box 5 is connected to the inlet of the power separator 8. In this embodiment, the circulating chute 7 is connected to the fluidized bed 4 through a flange.

[0029] Furthermore, if Figure 1 As shown, the circulating chute 7 is connected to the return box 5 via a circulating distributor 6. In this embodiment, the circulating distributor 6 is connected to the circulating chute 7 via a flange.

[0030] Furthermore, if Figure 1 and Figure 2 As shown, the circulating distributor 6 is provided with a plurality of inclined feed pipes, which are connected to the return box 5 .

[0031] Embodiment 3 is different from Embodiment 1 in that Figure 2As shown, the power separator 8 is provided with an arc-shaped guide plate for guiding the separated alumina into the alumina outlet and then into the left space of the fluidized bed 4.

[0032] Embodiment 4 is different from Embodiment 2 in that Figure 2 As shown, the lower part of the lower box 14 is connected to an air lift pump 2, and the air lift pump 2 is connected to a fresh chute 3 for feeding new alumina into the box for filtration. The high-fluorine flue gas entering the return box 5 reacts with the alumina coming down from the circulation chute 7 and the circulation distributor 6, and the fluorine content is reduced. After the power separator 8 works, it becomes low-fluorine flue gas. However, there is still some hydrogen fluoride gas in it, which does not meet the emission standards. Therefore, it meets the standards only after reacting with the fresh alumina sprayed out by the air lift pump.

[0033] Embodiment 5 is different from Embodiment 1 in that Figure 1 As shown, the left side space of the fluidized bed 4 is connected with a return chute 1 for conveying the high-fluorine-loaded secondary reaction alumina into the fluorine-loaded alumina bin through the return chute 1 .

[0034] The working process of the electrolytic flue gas purification device is as follows:

[0035] The fluorine-containing flue gas carries the low-fluorine-loaded primary reaction alumina coming out from the right side of the fluidized bed partition 12 through the circulation chute 7 and the circulation distributor 6 and enters the return box 5, and enters the power separator 8. The flue gas after gas-solid separation in the power separator 8 enters the middle box 9, and the high-fluorine-loaded secondary reaction alumina after gas-solid separation enters the left side of the fluidized bed partition 12 and is sent to the fluorine-loaded alumina warehouse through the return chute 1.

[0036] The fresh chute 3 and the pneumatic lift pump 2 continuously spray fresh alumina into the bottom of the filter bag to react with the low-fluorine flue gas from the power separator 8, and then blown down through the spray assembly 13 and fall into the fluidized bed on the right side of the fluidized bed partition 12. The flue gas enters the outlet flue through the upper box 10.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that any modification to the technical solutions described in the aforementioned embodiments, or any equivalent replacement of some or all of the technical features therein, within the spirit and principles of the present invention, and such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An electrolytic flue gas purification device capable of separating primary and secondary reaction alumina, characterized in that: The invention comprises a box body and a filtering mechanism arranged in the box body, wherein the lower part of the box body is connected to a power separator (8) and a fluidized bed (4), and a fluidized bed partition (12) is arranged in the fluidized bed (4) for dividing the fluidized bed (4) into two spaces on the left and right, wherein the space on the right side of the fluidized bed (4) is communicated with the space inside the box body, and the space on the right side of the fluidized bed (4) is connected to the inlet of the power separator (8) through a circulating material distribution mechanism; and the alumina outlet of the power separator (8) is communicated with the space on the left side of the fluidized bed (4).

2. The electrolytic flue gas purification device capable of separating primary and secondary reaction alumina according to claim 1 is characterized in that: A material baffle plate (11) is provided at the lower part of the box body, and the material baffle plate (11) is located above the left side space of the fluidized bed (4) and is used to prevent dust in the box body from falling into the left side space of the fluidized bed (4).

3. The electrolytic flue gas purification device capable of separating primary and secondary reaction alumina according to claim 1 or 2, characterized in that: The circulating material distribution mechanism comprises a circulating chute (7) connected to the right space of the fluidized bed (4) and a return box (5) connected to the circulating chute (7), and the return box (5) is connected to the inlet of the power separator (8).

4. The electrolytic flue gas purification device capable of separating primary and secondary reaction alumina according to claim 3 is characterized in that: The circulation chute (7) is connected to the return material box (5) via a circulation distributor (6).

5. The electrolytic flue gas purification device capable of separating primary and secondary reaction alumina according to claim 4 is characterized in that: The circulating chute (7) is connected to the fluidized bed (4) via a flange; and the circulating distributor (6) is connected to the circulating chute (7) via a flange.

6. The electrolytic flue gas purification device capable of separating primary and secondary reaction alumina according to claim 4 or 5, characterized in that: The circulating distributor (6) is provided with a plurality of inclined feed pipes, and the feed pipes are connected to the return box (5).

7. The electrolytic flue gas purification device capable of separating primary and secondary reaction alumina according to claim 1, 2, 4 or 5, characterized in that: The power separator (8) is provided with an arc-shaped guide plate for guiding the separated alumina into the alumina outlet and then into the left space of the fluidized bed (4).

8. The electrolytic flue gas purification device capable of separating primary and secondary reaction alumina according to claim 1, 2, 4 or 5, characterized in that: The lower part of the box is connected to a fresh chute (3) and an air lift pump (2) for delivering new alumina into the box.

9. The electrolytic flue gas purification device capable of separating primary and secondary reaction alumina according to claim 1, 2, 4 or 5, characterized in that: The left side space of the fluidized bed (4) is connected to a return chute (1).

10. The electrolytic flue gas purification device capable of separating primary and secondary reaction alumina according to claim 1, 2, 4 or 5, characterized in that: The top of the box is connected to a blowing assembly (13).

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