CN214634304U - Salt discharging system for aluminum oxide production - Google Patents
Salt discharging system for aluminum oxide production Download PDFInfo
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- CN214634304U CN214634304U CN202023292480.3U CN202023292480U CN214634304U CN 214634304 U CN214634304 U CN 214634304U CN 202023292480 U CN202023292480 U CN 202023292480U CN 214634304 U CN214634304 U CN 214634304U
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Abstract
The utility model relates to an aluminium oxide production technical field discloses an aluminium oxide production is with arranging salt system, including the plate and frame filter press, the plate and frame filter press is equipped with raw materials import and hot water import, the plate and frame filter press still is equipped with filtrating export and salt solution export, the hot water import with the salt solution export communicates respectively the filter chamber of plate and frame filter press, the hot water export is arranged in letting in hot water in the filter chamber behind the filtrating discharge and makes the salt cake in the filter chamber pass through after dissolving salt solution export discharge. The utility model provides a pair of salt system is arranged with production of aluminium oxide utilizes the salt ability to dissolve in the performance of water, sets up hot water import in solid-liquid separation's plate and frame filter press and is used for letting in hot water for salt filter cake dissolves in the pressure filter chamber and forms salt solution, thereby can effectively discharge the salt filter cake in the pressure filter fast, has solved the problem of solid-state salt filter cake sizing, is favorable to improve equipment operation rate, improves the salt discharge volume.
Description
Technical Field
The utility model relates to an aluminium oxide production technical field especially relates to an aluminium oxide production is with arranging salt system.
Background
At present, three methods for discharging salt in the production of alumina are available, namely forced effect salt discharge, patch alkali salt discharge and side stream causticization salt discharge, wherein the former two methods are to improve the concentration of sodium oxide in a sodium aluminate solution, reduce the solubility of salt in the sodium aluminate solution, separate salt from the sodium aluminate solution, perform solid-liquid separation by using a vertical disc filter, discharge the salt filtered out from the vertical disc filter to a salt dissolving tank, introduce hot water into the salt dissolving tank, dissolve the solid salt and then causticize, thereby achieving the purpose of discharging salt in the production of alumina, as shown in fig. 1.
Because the viscosity of the sodium aluminate solution after forced effective discharging and alkali patching is high, the granularity is finer and the solid content is low during salt precipitation. When salt in the existing salt discharge system is filtered, the filtered salt filter cake is easy to be stuck on a vertical disc filter, and after the salt is stuck, the salt is poked manually or is flushed by water, so that the operation rate of the equipment is reduced. Especially when the operation supervision of the equipment is not in place and the sticky materials are not cleaned in time, the salt forms ineffective circulation on the equipment, which is very unfavorable for the salt discharge in the production of the aluminum oxide.
SUMMERY OF THE UTILITY MODEL
The utility model provides a salt discharging system for the production of alumina for solve present salt discharging system and filter off and filter the salt filter cake and glue the material easily on the vertical disc filter, reduced equipment operating rate and reduced the problem of salt discharging volume.
The utility model provides an aluminium oxide production is with arranging salt system, including plate and frame filter press, plate and frame filter press is equipped with raw materials import and hot water import, plate and frame filter press still is equipped with filtrating export and salt solution export, hot water import with the salt solution export communicates respectively the filter chamber of plate and frame filter press, hot water export is arranged in letting in hot water in the filter chamber behind the filtrating discharge and passes through after making the salt filter cake dissolve in the filter chamber salt solution export is discharged.
According to the utility model provides a salt discharging system for aluminum oxide production, all be equipped with on every filter chamber of plate and frame filter press hot water inlet.
According to the utility model provides a salt discharging system for aluminum oxide production, be equipped with a plurality ofly along circumference on the plate and frame filter press hot water inlet.
According to the utility model provides an aluminium oxide production is with arranging salt system still includes change piece alkali groove and salt subsider, change the bottom in piece alkali groove communicate in salt subsider and be equipped with change piece alkali pump between the two, the bottom of salt subsider communicate in the raw materials import, just the bottom of salt subsider with be equipped with the underflow pump between the raw materials import.
According to the utility model provides a salt system is used in aluminium oxide production still includes compulsory effect evaporimeter, compulsory effect evaporimeter's export communicate in the salt subsider.
According to the utility model provides an aluminium oxide production is with arranging salt system still includes the hot-water tank, the hot-water tank communicate in hot water import, just the hot-water tank with be equipped with the heat-exchanger pump between the hot water import.
According to the utility model provides an aluminium oxide production is with arranging salt system, the filtrating export communicates in strong alkali groove, just the filtrating export with be equipped with first valve between the strong alkali groove.
According to the utility model provides an aluminium oxide production is with arranging salt system, the salt solution export communicates in the causticization groove, just the salt solution export with be equipped with the second valve between the causticization groove.
According to the utility model provides a salt system is used in aluminium oxide production, the setting of plate and frame filter press highly is higher than strong alkali groove with causticization groove.
According to the utility model provides an aluminium oxide production is with arranging salt system, hydrothermal temperature is 85-95 ℃.
The utility model provides a pair of salt system is arranged with production of aluminium oxide utilizes the salt ability to dissolve in the performance of water, sets up hot water import in solid-liquid separation's plate and frame filter press and is used for letting in hot water for salt filter cake dissolves in the pressure filter chamber and forms salt solution, thereby can effectively discharge the salt filter cake in the pressure filter fast, has solved the problem of solid-state salt filter cake sizing, is favorable to improve equipment operation rate, improves the salt discharge volume.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art salt rejection system for alumina production;
FIG. 2 is one of the schematic diagrams of the salt rejection system for alumina production provided by the present invention;
FIG. 3 is a second schematic diagram of a salt elimination system for aluminum oxide production according to the present invention.
Reference numerals:
1. a slice alkali tank; 2. a hot water tank; 3. a hot water pump; 4. a plate-and-frame filter press; 5. a forced effect evaporator; 6. a tablet alkali pump; 7. a salt settling tank; 8. an underflow pump; 9. a strong alkali tank; 10. and (4) a causticizing tank.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The salt discharge system for alumina production according to the present invention will be described with reference to fig. 2 and 3.
Referring to fig. 2, this embodiment provides a salt discharging system for aluminum oxide production, and this salt discharging system for aluminum oxide production includes plate and frame filter press 4, and plate and frame filter press 4 is equipped with raw materials import and hot water inlet, and plate and frame filter press 4 still is equipped with filtrating export and salt solution export, and hot water inlet and salt solution export communicate the filter chamber of plate and frame filter press 4 respectively, and hot water inlet is arranged in letting in hot water makes the salt cake in the filter chamber dissolve in the filtrating chamber and then discharges through the salt solution export after filtrating discharging. In order to discharge all the salt precipitated from the sodium aluminate solution, the embodiment provides a salt discharge system, which utilizes the property that the salt can be dissolved in water, and can dissolve the salt in a filtering device for solid-liquid separation to prepare a salt solution, thereby solving the problems of salt filter cake material sticking and reduced salt discharge.
The utility model provides a salt discharging system for aluminum oxide production utilizes the salt ability to dissolve in the performance of water, sets up hot water inlet in solid-liquid separation's plate and frame filter press 4 and is used for letting in hot water for salt filter cake dissolves in the pressure filter chamber and forms salt solution, thereby can effectively discharge the salt filter cake in the pressure filter fast, has solved the problem of solid-state salt filter cake sizing, is favorable to improve equipment operating rate, improves the salt discharge capacity.
On the basis of the above embodiment, further, refer to fig. 2 as a schematic connection diagram of the front view of the plate-and-frame filter press 4 in the salt discharge system. In this embodiment, each filter chamber of the plate-and-frame filter press 4 is provided with a hot water inlet. When hot water is introduced into the plate-and-frame filter press 4 to dissolve the salt filter cake, hot water can be introduced into each filter chamber simultaneously, so that the salt filter cake in each filter chamber is dissolved, and the salt filter cake can be better dissolved and discharged.
On the basis of the above embodiment, further, referring to fig. 3, a schematic connection diagram of a side view of the plate-and-frame filter press 4 in the salt discharge system is shown. In this embodiment, the plate-and-frame filter press 4 is provided with a plurality of hot water inlets along the circumferential direction. The arrangement of the plurality of hot water inlets can enable hot water to enter the filter cavity from different positions, and the salt filter cake can be fully contacted with the hot water inlets to be better dissolved. Specifically, a plurality of hot water inlets can be arranged at different positions of the end face of one end of the plate-and-frame filter press 4. Namely, a plurality of hot water inlets are arranged on the filtering cavity at one end of the plate-and-frame filter press 4, so that the salt filter cake can be better dissolved.
Furthermore, a plurality of hot water inlets may also be provided on other filter chambers of the plate-and-frame filter press 4, which are not shown in fig. 3. The specific arrangement position and the number of the hot water inlets are not limited, so that the salt filter cake can be better dissolved. Further, referring to fig. 3, in this embodiment, the raw material inlet, the hot water inlet, the filtrate outlet, and the salt solution outlet may be located on the same end surface of the plate-and-frame filter press. The raw material inlet, the hot water inlet, the filtrate outlet and the salt solution outlet can also be distributed on different surfaces of the plate-and-frame filter press, and are not limited specifically. Furthermore, a plurality of filtrate outlets are arranged on the plate-and-frame filter press. And a plurality of salt solution outlets can be arranged on the plate-and-frame filter press. To better drain the filtrate and the salt solution. Further, the filtrate outlet and the salt solution outlet may share a common outlet. Namely, a plurality of outlets are arranged on the plate-and-frame filter press; the plurality of outlets serve as both filtrate and saline solution outlets. The flow of filtrate and salt solution can be controlled by valves.
On the basis of the above embodiment, further, the salt discharge system for aluminum oxide production that this embodiment provided still includes dissolving piece alkali groove 1 and salt subsider 7, and the bottom of dissolving piece alkali groove 1 communicates in salt subsider 7 and is equipped with dissolving piece alkali pump 6 between the two, and the bottom of salt subsider 7 communicates in the raw materials import, and is equipped with underflow pump 8 between the bottom of salt subsider 7 and the raw materials import. The flake alkali tank 1 is used for carrying out flake alkali salt removal and separating out sodium carbonate in the sodium aluminate solution. The sodium aluminate solution containing sodium carbonate solids is driven by a caustic pump 6 to flow into a salt settling tank 7 for settling. The sodium aluminate solution at the bottom of the salt settling tank 7 carries sodium carbonate solid to flow into the plate-and-frame filter press 4 for solid-liquid separation under the drive of the underflow pump 8.
On the basis of the above embodiment, further, the salt elimination system for aluminum oxide production provided by this embodiment further includes a forced effect evaporator 5, and an outlet of the forced effect evaporator 5 is communicated with the salt settling tank 7. The forced effect evaporator 5 is used for forced effect salt elimination. Meanwhile, the slice alkali tank 1 and the forced effect evaporator 5 are utilized to remove salt, which is beneficial to improving the salt removal efficiency.
Specifically, the bottom of the slice alkali tank 1 can extend to the upper part of the salt settling tank 7 through a pipeline; discharging the sodium aluminate solution after salt removal into a salt settling tank 7. The outlet of the forced effect evaporator 5 can also extend to the upper part of the salt settling tank 7 through a pipeline; discharging the sodium aluminate solution after salt removal into a salt settling tank 7. The pipeline connected with the bottom of the slice alkali tank 1 and the pipeline connected with the outlet of the forced effect evaporator 5 can be collected and then flow into the salt settling tank 7.
On the basis of the above embodiment, further, the salt discharging system for aluminum oxide production provided by this embodiment further includes a hot water tank 2, the hot water tank 2 is communicated with the hot water inlet, and a hot water pump 3 is disposed between the hot water tank 2 and the hot water inlet. The hot water tank 2 is used for storing hot water.
On the basis of the above embodiment, further, the filtrate outlet is communicated with the strong alkali tank 9, and a first valve is arranged between the filtrate outlet and the strong alkali tank 9. The sodium aluminate solution raw material flowing into the plate-and-frame filter press 4 is subjected to solid-liquid separation, and the filtrate, i.e. the filtered solution, flows into the strong alkali tank 9 to continue the next process. The first valve is used for controlling the outflow of the filtrate.
In addition to the above embodiment, the top of the salt settling tank 7 is connected to the strong alkali tank 9. The salt settling tank 7 is used for solid-liquid settling separation of the sodium aluminate solution, and the sodium aluminate solution liquid is positioned at the top of the salt settling tank 7 and can be directly introduced into the strong alkali tank 9.
Specifically, a filtrate outlet of the plate-and-frame filter press 4 extends to the upper part of the strong alkali tank 9 through a pipeline; the filtrate was drained into the strong alkali tank 9. The top of the salt settler 7 can also extend through a pipeline to above the strong alkali tank 9. The pipeline connected with the top of the salt settling tank 7 can be converged with the pipeline connected with the filtrate outlet of the plate-and-frame filter press 4 and then flows into the strong alkali tank 9.
On the basis of the above embodiment, further, the salt solution outlet is communicated with the causticizing tank 10, and a second valve is arranged between the salt solution outlet and the causticizing tank 10. The salt solution outlet is used for flowing out the salt solution dissolved by hot water. The salt solution flows directly into the causticizing tank 10 to be subjected to the next process. The second valve is used to control the outflow of saline solution.
Furthermore, valves are also arranged on a hot water inlet pipeline and a raw material inlet pipeline of the plate-and-frame filter press and are used for controlling the flow of hot water and raw materials.
On the basis of the above embodiment, further, the plate-and-frame filter press 4 is arranged at a height higher than the strong alkali tank 9 and the causticizing tank 10. So that the filtrate can smoothly flow into the strong alkali tank 9; the salt solution can smoothly flow into the causticizing tank 10.
Referring to fig. 1, the salt discharge system for alumina production provided by this embodiment is mainly a water washing plate-and-frame filter press 4. The specific salt removing process comprises the following steps: and (3) conveying the sodium aluminate solution subjected to alkali salt elimination by the forced effect evaporator 5 and the patch into the washing plate-and-frame filter press 4 for filter pressing, wherein the salt forms a filter cake on the filter plate, hot water is introduced into a filter cavity of the washing plate-and-frame filter press 4, the salt filter cake is dissolved in the filter cavity to generate a salt solution, and the salt solution automatically flows to the causticization tank 10. The embodiment provides that wash plate and frame filter press 4 replaces the vertical disc filter to arrange salt, and wash plate and frame filter press 4 is sealing equipment, and the filter chamber can form sealed space and be used for leading to hot water and dissolve the salt filter cake, and the salt filter cake just dissolves into salt solution in wash plate and frame filter press 4, has overcome the salt filter cake and has filtered with the vertical disc filter and be difficult to unload cake, binder scheduling problem, has practiced thrift the investment cost and the working costs of salt dissolving tank, salt dissolving tank stirring, salt dissolving pump simultaneously.
On the basis of the above examples, further, the temperature of the hot water was 85-95 ℃. Hot water in this temperature range may better dissolve the salt cake.
Further, the flow rate of the hot water is 10-30m3H is used as the reference value. The hot water flow can be suitable for the salt discharge working condition of most sodium aluminate solutions, and is favorable for ensuring the complete dissolution of salt filter cakes in the plate-and-frame filter press 4.
On the basis of the above embodiments, further, this embodiment provides a specific application example of the salt elimination system for alumina production: the alumina capacity of an alumina plant is 200 ten thousand tons, the content of sodium carbonate (calculated by sodium oxide) in circulating mother liquor is 25g/l, four groups of evaporators are matched with four forced effect salt discharge apparatuses, the salt discharge amount per hour is 10t/h, the sodium carbonate in the circulating mother liquor is still in the rising trend, in order to reduce the sodium carbonate of the circulating mother liquor, part of sodium aluminate solution is led out from evaporation four-stage flash evaporation discharge to supplement caustic soda flakes for salt discharge, the sodium aluminate solution after forced effect and caustic flakes supplement is sent to a salt settling tank 7 in a salt discharge causticization area, and 200m underflow of the salt settling tank 7 is removed2Washing plate and frame filter press 4The overflow is sent to a strong alkali tank 9, the filtrate of the washing plate-and-frame filter press 4 is sent to the strong alkali tank 9, the solid is intercepted on the filter cloth to form a salt filter cake, 95-degree hot water is introduced into the plate-and-frame filter press 4, and the hot water flow of the washing plate-and-frame filter press 4 in each period is 20m3And/h, the salt filter cake is dissolved, and the dissolved salt filter cake automatically flows to the causticizing tank 10.
Further, referring to fig. 1, the technical solution adopted in this embodiment to solve the problems of the prior art is to configure a water-washing plate-and-frame filter press 4 for removing the salt precipitated in the production of alumina. The salt discharge system for producing the aluminum oxide is specifically connected as follows: the outlet of the forced effect evaporator 5 is connected with a salt settling tank 7, the outlet of the salt settling tank 7 is connected with a washing plate-and-frame filter press 4 and a strong alkali tank 9, the outlet of the washing plate-and-frame filter press 4 is connected with a strong alkali tank 9 and a causticization tank 10, the outlet of the hot water tank 2 is connected with a hot water pump 3, and the outlet of the hot water pump 3 is connected with the washing plate-and-frame filter press 4. The water washing plate and frame filter press 4 is installed at a position higher than the causticizing tank 10 so that the salt solution automatically flows to the causticizing tank 10.
The specific process comprises the following steps: the sodium aluminate solution of the forced effect evaporator 5 and the slice alkali tank 1 enters a salt settling tank 7, the salt settling tank 7 overflows into a strong alkali tank 9, the underflow of the salt settling tank 7 enters a water washing plate-and-frame filter press 4 through an underflow pump 8, the filtrate of the water washing plate-and-frame filter press 4 enters the strong alkali tank 9, the salt solution of the water washing plate-and-frame filter press 4 automatically flows to a causticizing tank 10, and the hot water in the hot water tank 2 is sent to the water washing filter press through a hot water pump 3 to dissolve the salt filter cake of the plate-and-frame filter press 4. The sodium aluminate solution after forced effect discharge or alkali supplementation is sent into a washing plate-and-frame filter press 4 through an underflow pump 8, salt forms filter cakes on filter plates of the plate-and-frame filter press 4, 95-degree hot water is introduced into a washing channel of the plate-and-frame filter press 4, the hot water enters the washing channel of the plate-and-frame filter press 4 and then enters each filter cavity from the washing channel, the formed salt filter cakes are subjected to back washing, the salt filter cakes are easily dissolved in water, salt solution is formed in the filter cavities by the salt filter cakes, and the salt solution is discharged from a filter liquor pipe and automatically flows to a causticizing tank 10. The hot water flow required by the washing plate-and-frame filter press 4 in each period is 10-30m3/h。
Compared with the prior art, the embodiment has the advantages that:
in the prior art, a sodium aluminate solution is sent into a vertical disc filter, salt is subjected to four processes of hanging cakes, sucking, discharging cakes and regenerating in the vertical disc filter, a salt filter cake is discharged into a salt dissolving tank, 95-degree hot water is introduced into the salt dissolving tank, the salt filter cake is stirred and dissolved in the salt dissolving tank, and the dissolved salt filter cake is causticized by a salt dissolving pump in a causticizing tank 10.
And this embodiment disposes a washing plate and frame filter press 4, replaces the vertical disc filter, forces to imitate the sodium aluminate solution behind the ejection of compact and the patch alkali, send into washing plate and frame filter press 4 through underflow pump 8, salt forms the filter cake on the filter plate of washing plate and frame filter press 4, treat that the filter cake fills up the filter chamber, hot-water pump 3 starts, pour into hot water behind 4 filter chambers of washing plate and frame filter press through the washing passageway, hot water passes through filter plate and filter cloth back flush salt filter cake, the salt filter cake dissolves in the filter chamber, generate the salt solution, flow to causticization groove 10 through the filtrate pipe automatically.
In the embodiment, the washing plate-and-frame filter press 4 is used for replacing a vertical disc filter, and the salt filter cake is filtered and dissolved in the washing plate-and-frame filter press 4, and only two processes, namely feeding and water feeding, are needed. In the prior art, the salt filter cake is filtered, sucked and discharged to a salt dissolving tank in a vertical disc filter, the filter cloth enters the next cycle after being regenerated, hot water is introduced into the salt dissolving tank, the mixture is stirred, and then the mixture is pumped to a causticizing tank 10 by a salt dissolving pump, so that the process is complex.
The embodiment saves the investment cost and the operating cost of the salt solution tank, the stirring of the salt dissolving tank and the salt dissolving pump. In the construction period of the equipment, the position of the washing plate-and-frame filter press 4 is higher than the causticizing tank 10, so that the salt solution can automatically flow to the causticizing tank 10. Two pneumatic valves are arranged on a filter liquor pipe on the filter-pressing of the washing plate frame, the filter liquor enters a strong alkali groove 9 during feeding, and the salt solution enters a causticizing groove 10 during water feeding.
The embodiment can discharge all the salt precipitated from the sodium aluminate solution, increase the salt discharge amount in the alumina production and reduce the harm to the alumina production caused by the salt rising. The key is that cake unloading is not needed, salt is completely dissolved in the filtering cavity of the plate-and-frame filter press 4, and the technical problem of low salt discharge caused by material sticking of salt filter cakes in the prior art is solved.
In the above embodiments, the equipment used is conventional in the art unless otherwise specified.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. The salt discharging system for aluminum oxide production is characterized by comprising a plate-and-frame filter press, wherein the plate-and-frame filter press is provided with a raw material inlet and a hot water inlet, the plate-and-frame filter press is further provided with a filtrate outlet and a salt solution outlet, the hot water inlet and the salt solution outlet are respectively communicated with a filter cavity of the plate-and-frame filter press, and the hot water inlet is used for introducing hot water into the filter cavity after filtrate is discharged so that salt filter cakes in the filter cavity are dissolved and then discharged through the salt solution outlet.
2. The salt discharge system for aluminum oxide production according to claim 1, wherein each filter chamber of the plate-and-frame filter press is provided with the hot water inlet.
3. The salt discharge system for aluminum oxide production according to claim 1, wherein a plurality of hot water inlets are circumferentially provided on the plate-and-frame filter press.
4. The salt discharge system for aluminum oxide production according to claim 1, further comprising a tablet alkali tank and a salt settling tank, wherein the bottom of the tablet alkali tank is communicated with the salt settling tank, a tablet alkali pump is arranged between the tablet alkali tank and the salt settling tank, the bottom of the salt settling tank is communicated with the raw material inlet, and an underflow pump is arranged between the bottom of the salt settling tank and the raw material inlet.
5. The salt discharge system for aluminum oxide production according to claim 4, further comprising a forced effect evaporator, wherein an outlet of the forced effect evaporator is communicated with the salt settling tank.
6. The salt discharging system for aluminum oxide production according to claim 1, further comprising a hot water tank, wherein the hot water tank is communicated with the hot water inlet, and a hot water pump is arranged between the hot water tank and the hot water inlet.
7. The salt discharge system for aluminum oxide production according to claim 4, wherein the filtrate outlet is communicated with a strong alkali tank, and a first valve is arranged between the filtrate outlet and the strong alkali tank.
8. The salt discharge system for aluminum oxide production as claimed in claim 7, wherein the salt solution outlet is connected to a causticizing tank, and a second valve is arranged between the salt solution outlet and the causticizing tank.
9. The salt discharge system for aluminum oxide production according to claim 8, wherein the plate-and-frame filter press is arranged at a height higher than the strong alkali tank and the causticization tank.
10. The salt rejection system for aluminum oxide production as claimed in claim 1, wherein the temperature of said hot water is 85-95 ℃.
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| CN202023292480.3U CN214634304U (en) | 2020-12-30 | 2020-12-30 | Salt discharging system for aluminum oxide production |
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| CN202023292480.3U CN214634304U (en) | 2020-12-30 | 2020-12-30 | Salt discharging system for aluminum oxide production |
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