CN218755057U - Purification system of sodium aluminate solution in alumina production - Google Patents
Purification system of sodium aluminate solution in alumina production Download PDFInfo
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- CN218755057U CN218755057U CN202220691377.6U CN202220691377U CN218755057U CN 218755057 U CN218755057 U CN 218755057U CN 202220691377 U CN202220691377 U CN 202220691377U CN 218755057 U CN218755057 U CN 218755057U
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Abstract
The utility model discloses a purification system of sodium aluminate solution in alumina production belongs to alumina production technical field. The utility model discloses an ash bin, stirred tank, reaction tank and liquid-solid separator, the feed inlet of stirred tank respectively with the aluminium oxide production system in the decomposer the discharge gate in ash bin is connected, the discharge gate of stirred tank with the feed inlet of reaction tank is connected, the discharge gate of reaction tank with the feed inlet of liquid-solid separator is connected, the liquid outlet of liquid-solid separator is connected with the evaporimeter in the aluminium oxide production system. The utility model discloses increase in the aluminium oxide production system, can effectively purify the organic matter impurity in the sodium aluminate solution, return to the use of recycling in the aluminium oxide production system again after the sodium aluminate solution purifies, can ensure the normal clear of aluminium oxide production, improve product quality and production efficiency.
Description
Technical Field
The utility model relates to an aluminium oxide production technical field, concretely relates to sodium aluminate solution's clean system in aluminium oxide production.
Background
Bauxite is used as a raw material to prepare alumina, and the Bayer process is a common process. The Bayer process includes dissolving bauxite in sodium hydroxide solution of certain concentration at certain temperature, diluting, cooling, adding aluminum hydroxide crystal seed, precipitating in a decomposing tank to obtain aluminum hydroxide, roasting to obtain alumina, and separating to obtain sodium aluminate solution, evaporating and concentrating in an evaporator and returning to the dissolving step for reuse.
Bauxite is distributed around the world where the composition of bauxite varies from region to region. The bauxite contains more or less organic substances which are dissolved out together with alumina in the bauxite during the dissolving process to become impurities in the sodium aluminate solution. Most of organic matters in the bauxite are long-chain high-molecular-weight organic compounds, such as sodium humate, wherein part of the long-chain organic matters are degraded into various short-chain organic matters such as sodium fulvate, sodium formate, sodium acetate, sodium lactate, sodium benzoate, sodium salicylate, sodium tartrate, sodium phthalate, sodium isophthalate, sodium terephthalate, sodium trimesate, sodium oxalate and the like in the dissolution process. The sodium aluminate solution is recycled in the process of producing alumina by the Bayer process, so that organic matters in Bayer liquor are accumulated continuously, the organic matters in the Bayer liquor are accumulated to a certain concentration, the product quality and the production efficiency can be reduced, and even the production cannot be carried out. Organic matters such as sodium humate and sodium fulvate not only influence the whiteness of the aluminum hydroxide, but also increase the viscosity of Bayer liquor, increase system foam and reduce the decomposition yield; if crystals are precipitated in the decomposition step, the decomposition tank is scarred, and the efficiency of the filtration equipment is lowered. Therefore, the sodium aluminate solution in the alumina production needs to be purified, the concentration of the organic matters is controlled, and then the purified solution is recycled to ensure the normal production.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the above-mentioned problem that prior art exists, provide a clean system of sodium aluminate solution in aluminium oxide production, the utility model discloses increase in the aluminium oxide production system, can effectively purify the organic matter impurity in the sodium aluminate solution, return to recycling in the aluminium oxide production system after the purification of sodium aluminate solution again, can ensure the normal clear of aluminium oxide production, improve product quality and production efficiency.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the purification system of the sodium aluminate solution in the alumina production comprises an ash bin, a stirring tank, a reaction tank and a liquid-solid separator, wherein a feed port of the stirring tank is respectively connected with a decomposition tank in the alumina production system and a discharge port of the ash bin, a discharge port of the stirring tank is connected with a feed port of the reaction tank, a discharge port of the reaction tank is connected with a feed port of the liquid-solid separator, and a liquid outlet of the liquid-solid separator is connected with an evaporator in the alumina production system.
Furthermore, the discharge port of the ash bin is connected with the feed port of the stirring tank through a screw feeder.
Further, be equipped with the stirring rake in the agitator tank, the agitator tank includes solid feed inlet and liquid feed inlet, the solid feed inlet of agitator tank with the discharge gate in ash storehouse is connected, the liquid feed inlet of agitator tank passes through the liquid outlet connection of the decomposer in buffer tank and the aluminium oxide production system.
Furthermore, a rake machine is arranged in the reaction tank.
Furthermore, the clean system still includes the auxiliary material storage tank, the auxiliary material storage tank is used for storing diallyl dimethyl ammonium chloride, the auxiliary material storage tank with the feed inlet of reaction tank is connected.
Further, the liquid-solid separator is any one of a belt filter, a plate-and-frame filter press and a flat disc filter.
Further, a liquid outlet of the liquid-solid separator is connected with a feed inlet of an evaporator in the alumina production system through a buffer tank.
The utility model has the advantages that:
the purification system of the sodium aluminate solution in the alumina production is additionally arranged in the alumina production system, an ash bin in the purification system of the sodium aluminate solution in the alumina production is used for storing coal ash, the coal ash is conveyed into a stirring tank from the ash bin, meanwhile, the sodium aluminate solution to be treated is introduced into the stirring tank, the coal ash and the sodium aluminate solution to be treated are uniformly mixed in the stirring tank, then, the mixed slurry is conveyed into a reaction tank, after the mixed slurry is kept still in the reaction tank for a certain time, the adhered mixed slurry is conveyed from the reaction tank to a liquid-solid separation device, after the mixed slurry adhered with organic matters is separated by the liquid-solid separation device, the organic matters are adhered to a filter cake to further achieve the purpose of purifying the filter liquor, namely the purified sodium aluminate solution is conveyed back to an evaporator of the alumina production system, and is returned to a dissolution process for recycling after evaporation and concentration, and the filter cake is conveyed to a power plant or other coal-fired devices for recycling. The sodium aluminate solution in the alumina production passes through the utility model discloses handle the back, the organic matter in the sodium aluminate solution is effectively got rid of, and the organic matter concentration in the sodium aluminate solution after purifying is low, returns again to dissolve out the process and recycles, can ensure going on smoothly of production, can improve product quality and production efficiency simultaneously.
Drawings
FIG. 1 is a schematic diagram of a system according to a preferred embodiment of the present invention;
reference numbers in the figures: 1-ash bin; 2-a stirring tank; 3-a buffer tank; 4-stirring paddle; 5-a reaction tank; 6-raking machine; 7-liquid-solid separator; 8-a buffer tank; 10-a screw feeder; 11-auxiliary material storage tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only 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 work belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Examples
As shown in fig. 1, the present embodiment provides a system for purifying sodium aluminate solution in alumina production, which includes an ash bin 1, a stirring tank 2, a reaction tank 5 and a liquid-solid separator 7, where the ash bin 1 is used to store coal ash, the coal ash is a byproduct ash produced by a coal gas producer, i.e. a pulverized coal furnace, and is called intermediate ash in the industry; the feed inlet of the stirring tank 2 is respectively connected with a decomposition tank in an alumina production system and a discharge outlet of the ash bin 1, the discharge outlet of the stirring tank 2 is connected with the feed inlet of the reaction tank 5, the discharge outlet of the reaction tank 5 is connected with the feed inlet of the liquid-solid separator 7, and a liquid outlet of the liquid-solid separator 7 is connected with an evaporator in the alumina production system. When the purification system of the sodium aluminate solution in the alumina production works, coal ash is conveyed into the stirring tank 2 from the ash bin 1, meanwhile, the sodium aluminate solution to be treated separated from a decomposition tank in the alumina production system is introduced into the stirring tank 2, the coal ash and the sodium aluminate solution to be treated are uniformly mixed in the stirring tank 2, the obtained mixed slurry is conveyed into the reaction tank 5, the mixed slurry is kept still in the reaction tank 5 for a certain time to react, the reacted mixed slurry is conveyed into the liquid-solid separation equipment 7, the reacted mixed slurry is separated by the liquid-solid separation equipment 7 to obtain filtrate and filter cakes, and the filtrate, namely the purified sodium aluminate solution is output through a liquid outlet of the liquid-solid separator 7 and is conveyed back to an evaporator of the alumina production system to be evaporated and concentrated and then is transferred to a dissolution process for recycling; the filter cake is a coal ash filter cake with organic matters, has low water content, can be directly sent to a coal-fired boiler of a power plant or other coal-fired devices for fuel utilization, and is safe and environment-friendly.
In the present embodiment, the discharge port of the ash bin 1 is connected to the feed port of the stirring tank 2 through a screw feeder 10. When the powder conveying device is used, the coal ash is powder, the coal ash is conveyed into the stirring tank 2 from the ash bin 1 through the screw feeder 10, and the feeding screw of the screw feeder 10 has a steady flow structure, so that the powder is uniformly conveyed.
In this embodiment, be equipped with stirring rake 4 in the stirred tank 2, stirred tank 2 includes solid feed inlet and liquid feed inlet, the solid feed inlet of stirred tank 2 with the discharge gate in ash storehouse 1 is connected, the liquid feed inlet of stirred tank 2 is connected through the liquid outlet of a buffer tank 3 and the decomposer in the aluminium oxide production system. When the device is used, the coal ash and the sodium aluminate solution to be treated enter the stirring tank 2, then the coal ash and the sodium aluminate solution to be treated can be uniformly mixed under the stirring of the stirring paddle 4, and the stirring paddle 4 is simple in structure and can achieve the purpose of uniform mixing. The buffer tank 3 can receive and store the sodium aluminate solution to be treated separated from the liquid outlet of the decomposing tank in the alumina production system, and the sodium aluminate solution to be treated can be more conveniently controlled in treatment amount after being stored in the buffer tank 3, namely, a certain amount of the sodium aluminate solution to be treated is transferred out of the buffer tank 3 to be treated in the stirring tank 2 according to actual conditions.
In the present embodiment, a rake 6 is provided in the reaction tank 5. After the mixed slurry is kept still in the reaction tank 5 for a certain time to react, the rake 6 rotates slowly to prevent the solid from sinking into the tank, and the reacted mixed slurry is sent to the liquid-solid separation equipment 7 from the bottom of the reaction tank 5 for subsequent treatment.
In this embodiment, the purification system for sodium aluminate solution in alumina production further comprises an auxiliary material storage tank 11, wherein the auxiliary material storage tank 11 is used for storing diallyldimethylammonium chloride, and the auxiliary material storage tank 11 is connected with the feed inlet of the reaction tank 5. After the coal ash and the sodium aluminate solution to be treated are uniformly mixed in the stirring tank 2, the obtained mixed slurry is sent to the reaction tank 5, and meanwhile, the diallyl dimethyl ammonium chloride is transferred from the auxiliary material storage tank 11 to the reaction tank 5 for reaction. After the sodium aluminate solution to be treated is treated by the diallyl dimethyl ammonium chloride in the auxiliary material storage tank 11, the purification effect of the sodium aluminate solution can be effectively improved.
In the present embodiment, the liquid-solid separator 7 is a plate-and-frame filter press. Adopt plate and frame filter press to carry out liquid-solid separation to the mixed ground paste after the reaction, the plate and frame filter press can handle the big ground paste of viscosity such as containing organic matter, and the solid sediment moisture content of output is low, does benefit to the subsequent recycle of filter cake.
In the present embodiment, the liquid outlet of the liquid-solid separator 7 is connected to the feed inlet of the evaporator in the alumina production system through a buffer tank 8. The purified sodium aluminate solution separated by the liquid-solid separator 7 is transferred to the buffer tank 8, and then transferred from the buffer tank 8 to an evaporator in an alumina production system. The buffer tank 8 can receive and store the purified sodium aluminate solution, and the purified sodium aluminate solution can more conveniently control the treatment capacity after passing through the buffer tank 8, namely, a certain amount of the purified sodium aluminate solution is transferred out of the buffer tank 8 to an evaporator in an alumina production system for subsequent treatment according to the actual situation.
It is understood that in other embodiments, the liquid-solid separator 7 may be selected from a belt filter or a flat disc filter.
In practical application, the treatment capacity of the sodium aluminate solution to be treated is determined according to the scale of a factory and the balance of organic matters, and the used equipment is controlled by a PLC or a DCS (distributed control System) directly connected with alumina, so that continuous and stable operation is realized. The utility model discloses since the development, successful industrialization in three mill has been used, and technical performance is stable, and the running cost is low, has obtained good effect.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced equally without departing from the spirit and scope of the technical solutions, and all the technical solutions should be covered by the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a clean system of sodium aluminate solution in alumina production which characterized in that: the device comprises an ash bin (1), a stirring tank (2), a reaction tank (5) and a liquid-solid separator (7), wherein a feed inlet of the stirring tank (2) is respectively connected with a decomposition tank in an alumina production system and a discharge outlet of the ash bin (1), a discharge outlet of the stirring tank (2) is connected with a feed inlet of the reaction tank (5), a discharge outlet of the reaction tank (5) is connected with a feed inlet of the liquid-solid separator (7), and a liquid outlet of the liquid-solid separator (7) is connected with an evaporator in the alumina production system.
2. The system for purifying sodium aluminate solution in alumina production as claimed in claim 1, wherein: the discharge port of the ash bin (1) is connected with the feed port of the stirring tank (2) through a screw feeder (10).
3. The system for purifying sodium aluminate solution in alumina production as claimed in claim 1, wherein: be equipped with stirring rake (4) in stirred tank (2), stirred tank (2) include solid feed inlet and liquid feed inlet, the solid feed inlet of stirred tank (2) with the discharge gate in ash storehouse (1) is connected, the liquid feed inlet of stirred tank (2) passes through the liquid outlet connection of buffer tank (3) and the decomposer in the aluminium oxide production system.
4. The system for purifying sodium aluminate solution in alumina production as claimed in claim 1, wherein: a rake (6) is arranged in the reaction tank (5).
5. The system for purifying sodium aluminate solution in alumina production as claimed in claim 1, wherein: the purification system further comprises an auxiliary material storage tank (11), wherein the auxiliary material storage tank (11) is used for storing diallyl dimethyl ammonium chloride, and the auxiliary material storage tank (11) is connected with a feeding hole of the reaction tank (5).
6. The system for purifying sodium aluminate solution in alumina production as claimed in claim 1, wherein: the liquid-solid separator (7) is any one of a belt filter, a plate-and-frame filter press and a flat disc filter.
7. The system for purifying sodium aluminate solution in alumina production as claimed in claim 1, wherein: and a liquid outlet of the liquid-solid separator (7) is connected with a feed inlet of an evaporator in the alumina production system through a buffer tank (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220691377.6U CN218755057U (en) | 2022-03-28 | 2022-03-28 | Purification system of sodium aluminate solution in alumina production |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220691377.6U CN218755057U (en) | 2022-03-28 | 2022-03-28 | Purification system of sodium aluminate solution in alumina production |
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