CN116145196A - Continuous feeding method in electrolytic aluminum production process - Google Patents

Continuous feeding method in electrolytic aluminum production process Download PDF

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Publication number
CN116145196A
CN116145196A CN202211572907.6A CN202211572907A CN116145196A CN 116145196 A CN116145196 A CN 116145196A CN 202211572907 A CN202211572907 A CN 202211572907A CN 116145196 A CN116145196 A CN 116145196A
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China
Prior art keywords
electrolytic
pipe
electrolyte
production process
aluminum production
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CN202211572907.6A
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黄冲
冯自平
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Guangzhou Institute of Energy Conversion of CAS
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Guangzhou Institute of Energy Conversion of CAS
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Priority to CN202211572907.6A priority Critical patent/CN116145196A/en
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/14—Devices for feeding or crust breaking
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)

Abstract

The invention discloses a continuous feeding method in an electrolytic aluminum production process, which is carried out by utilizing an electrolytic tank and relates to the technical field of continuous feeding production technology, and the method can comprise the following steps: and leading the electrolyte in the electrolytic tank out of the electrolytic tank, adding solid alumina powder, and returning the electrolyte mixed with the solid alumina powder to the electrolytic tank. The invention can continuously add the solid alumina powder into the electrolyte, and solves the problem of large fluctuation of the alumina concentration of the electrolyte.

Description

Continuous feeding method in electrolytic aluminum production process
Technical Field
The invention relates to the technical field of continuous feeding production processes, in particular to a continuous feeding method in an electrolytic aluminum production process.
Background
In the production of electrolytic aluminum, alumina (Al 2 O 3 ) Adding the aluminum oxide into molten cryolite at about 950-970 ℃ to form an electrolyte containing aluminum oxide, then carrying out electrolysis, obtaining aluminum liquid at a negative electrode, and carrying out electrolysis, wherein the concentration of aluminum oxide in the electrolyte is reduced, and the aluminum oxide powder must be timely supplemented, otherwise, the concentration is too low, so that the problems of low production efficiency, high energy consumption, even anode effect, sudden voltage surge, burning out of a ledge, increasing volatilization of fluoride salt and the like are caused. The current method for adding the alumina powder is to chisel the crust above the electrolytic tank, add a bit of alumina powder, stop for a while, chisel and add again, and carry out the process periodically. Can not be added at one time for a long timeThis can lead to excessive concentration fluctuations; and the continuous addition cannot be performed slowly, so that the crust is opened directly, and the leakage of air and heat is too large. So the current production process adopts periodic feeding, so that the alumina concentration of the electrolyte is controlled within an acceptable range. However, the current periodic charging method of electrolytic aluminum has the problem of large fluctuation of the alumina concentration of the electrolyte, which is disadvantageous in improving the production efficiency.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a continuous feeding method in the electrolytic aluminum production process, which can continuously add solid alumina powder into electrolyte and solve the problem of large fluctuation of alumina concentration of the electrolyte.
In order to achieve the above purpose, the present invention may be performed by the following technical scheme:
the continuous feeding method for electrolytic aluminum production process is carried out by using an electrolytic tank and comprises the following steps:
and leading the electrolyte in the electrolytic tank out of the electrolytic tank, adding solid alumina powder, and returning the electrolyte mixed with the solid alumina powder to the electrolytic tank.
The continuous feeding method of the electrolytic aluminum production process as described above, further, the electrolyte comprises cryolite, alumina and an auxiliary agent.
The continuous feeding method in the electrolytic aluminum production process further determines the flow rate of the extracted electrolyte according to the addition amount of the solid alumina powder.
According to the continuous feeding method in the electrolytic aluminum production process, further, the electrolytic area of the electrolytic tank is connected with the liquid guiding pipe and the liquid returning pipe, one end of the liquid guiding pipe, which is positioned outside the electrolytic tank, is also connected with the feeding pipe, the liquid returning pipe is provided with the feeding pump, the liquid guiding pipe is used for guiding out electrolyte in the electrolytic tank, the feeding pipe is used for adding solid alumina powder, and the liquid returning pipe with the feeding pump is used for returning the electrolyte mixed with the solid alumina powder to the electrolytic tank.
According to the continuous feeding method in the electrolytic aluminum production process, further, the hopper is arranged at the feeding hole of the feeding pipe, the air locking blanking machine is arranged at the discharging hole of the hopper, the blanking amount of the solid alumina powder is controlled by the rotating speed of the air locking blanking machine, and the continuous feeding method is used for preventing waste gas in the electrolytic tank from overflowing or preventing air from entering the electrolytic tank.
The continuous feeding method of the electrolytic aluminum production process as described above, further, the electrolytic tank has a furnace wall, and a crust is provided on the inner side of the furnace wall.
According to the continuous feeding method in the electrolytic aluminum production process, further, the cathode region of the electrolysis region is provided with the cathode steel bar and the cathode carbon block, the anode region of the electrolysis region is provided with the anode carbon block, one end of the cathode steel bar extends out of the furnace wall, the cathode steel bar is provided with the cathode carbon block, and the anode carbon block is arranged above the cathode carbon block.
According to the continuous feeding method in the electrolytic aluminum production process, further, the inlet and outlet pipe diameters of the liquid guiding pipe are determined according to the flow and the flow of the electrolyte.
The continuous feeding method of the electrolytic aluminum production process as described above, further, the addition rate of the solid alumina powder is determined according to the measured electrolyte concentration or according to the current of the electrolytic cell.
According to the continuous feeding method in the electrolytic aluminum production process, further, the liquid guiding pipe, the feeding pipe, the liquid returning pipe and the feeding pump are all provided with heaters in an auxiliary mode.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the solid alumina powder can be continuously added into the electrolyte, the alumina concentration of the electrolyte can be accurately controlled, and the production efficiency is improved. In addition, the method does not need to repeatedly chisel the crust, does not need to configure a cutting mechanism, avoids the condition of air leakage from the chisel, and can better organize exhaust emission.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view showing the structure of an electrolytic cell of a continuous feeding method in an electrolytic aluminum production process according to an embodiment of the present invention;
FIG. 2 is a partial schematic view of the feed portion of the electrolytic cell shown in FIG. 1.
Wherein: 1. an electrolytic cell; 2. a liquid guiding pipe; 3. a feeding tube; 4. a feed pump; 5. a liquid return pipe; 6. a cathode steel bar; 7. a cathode carbon block; 8. a male charcoal block; 9. a furnace wall; 10. crusting; 11. a movable cover plate; 12. air locking blanking machine; 13. and (3) a hopper.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Examples:
it should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
It is to be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," and the like are directional or positional relationships as indicated based on the drawings, merely to facilitate describing the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. Furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Referring to fig. 1 to 2, the invention provides a continuous feeding method in an electrolytic aluminum production process, which is carried out by using an electrolytic tank 1, can realize continuous addition of solid alumina powder into an electrolyte, and solves the problem of large fluctuation of alumina concentration of the electrolyte in the conventional periodic feeding method. The method of the present invention may comprise the steps of: the electrolyte in the electrolytic tank 1 is led out of the electrolytic tank 1, solid alumina powder is added, and the electrolyte mixed with the solid alumina powder is returned to the electrolytic tank 1. By way of example, the electrolyte may include cryolite, alumina, and an auxiliary agent. The method for continuously adding the alumina powder can accurately control the alumina concentration of the electrolyte, and solves the problem of large fluctuation of the alumina concentration of the electrolyte in the conventional periodic feeding method. In addition, the method does not need to repeatedly chisel the crust 10 and configure a cutting mechanism, can avoid the condition of air leakage from a chisel, and can better organize exhaust emission.
In the above embodiment, further, the flow rate of the extracted electrolyte needs to be determined according to the addition amount of the solid alumina powder. The rate of addition of the solid alumina powder can be determined from the measured electrolyte concentration or from the current of the cell 1 in order to better control the concentration of alumina in the electrolyte.
Referring to fig. 1 again, fig. 1 shows an electrolytic tank 1 used in the continuous feeding method of the invention, an electrolysis area of the electrolytic tank 1 is connected with a liquid guiding pipe 2 and a liquid returning pipe 5, one end of the liquid guiding pipe 2 and one end of the liquid returning pipe 5 outside the electrolytic tank 1 are also connected with a feeding pipe 3, the liquid returning pipe 5 is provided with a feeding pump 4, the liquid guiding pipe 2 is used for leading out electrolyte in the electrolytic tank 1, the feeding pipe 3 is used for adding solid alumina powder, and the liquid returning pipe 5 with the feeding pump 4 is used for returning the electrolyte mixed with the solid alumina powder to the electrolytic tank 1. Specifically, when the present electrolytic cell 1 is used, the working process thereof is as follows: electrolyte flows out from a liquid guiding pipe 2 of the electrolytic tank 1, solid alumina powder is added into a feeding pipe 3, and then the electrolyte mixed with the solid alumina powder is returned into the electrolytic tank 1 through a liquid returning pipe 5 by a feeding pump 4. It should be understood that the inlet of the liquid guiding pipe 2 and the outlet of the liquid returning pipe 5 need to be ensured to be under the liquid level in the electrolytic tank 1, are not exposed to the air, cannot be used in the liquid aluminum layer, and can avoid absorbing electrolyte with more gas. In addition, the inlet of the liquid guiding pipe 2 and the outlet of the liquid returning pipe 5 need to be kept at a certain distance, so that short circuit is avoided. Preferably, in order to ensure a uniform alumina concentration of the electrolyte in the electrolytic cell 1, a plurality of inlets of the liquid-introducing pipe 2 and outlets of the liquid-returning pipe 5 may be provided.
In the above embodiment, further, the inlet and outlet pipe diameters of the liquid guiding pipe 2 are determined according to the flow and the flow of the electrolyte. Specifically, the inlet and outlet pipe diameters of the liquid guiding pipe 2 need to consider both flow and flow velocity, electrolyte in the tank does not need to flow in a transitional way, the proper flow is beneficial to improving the production efficiency, and the transitional flow can cause the diffusion of liquid aluminum and carbon dioxide, so that the production efficiency is reduced.
In some embodiments, the liquid guiding pipe 2, the feeding pipe 3, the liquid returning pipe 5 and the feeding pump 4 are all provided with heaters in an auxiliary mode. Specifically, since the electrolyte may be led out of the electrolytic cell 1 and solidified due to cooling of the electrolyte, the liquid-guiding pipe 2, the charging pipe 3, the liquid-returning pipe 5 and the feed pump 4 all need to be insulated, and some of the above-mentioned pipes are heated, and an electric heating rod may be arranged outside the pipes.
Referring again to fig. 1, the cell 1 has a furnace wall 9, the inside of the furnace wall 9 being provided with a crust 10. The top of the electrolytic tank 1 is provided with a movable cover plate 11, a cathode area of an electrolytic area of the electrolytic tank 1 is provided with a cathode steel bar 6 and a cathode carbon block 7, an anode area of the electrolytic area is provided with a anode carbon block 8, wherein one end of the cathode steel bar 6 extends out of the furnace wall 9 and the cathode steel bar 6 is provided with the cathode carbon block 7, and the anode carbon block 8 is arranged above the cathode carbon block 7.
Referring to fig. 2, in some embodiments, a hopper 13 is installed at a feed inlet of the feed pipe 3, a discharge opening of the hopper 13 is provided with a wind-locking blanking machine 12, and a blanking amount of solid alumina powder is controlled by rotating the wind-locking blanking machine 12, and exhaust gas in the electrolytic tank 1 is prevented from overflowing or air is prevented from entering. Specifically, the solid alumina powder is firstly conveyed to the hopper 13, and the rotation speed of the air-locking blanking machine 12 is controlled, so that the quantity of blanking is controlled, and meanwhile, the air-locking blanking machine 12 can also prevent the feeding pipe 3 from being directly connected with the hopper 13, so that waste gas in the electrolytic tank 1 overflows or air is prevented from entering through the position.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The continuous feeding method for the electrolytic aluminum production process is characterized by being carried out by an electrolytic tank and comprising the following steps of:
and leading the electrolyte in the electrolytic tank out of the electrolytic tank, adding solid alumina powder, and returning the electrolyte mixed with the solid alumina powder to the electrolytic tank.
2. The continuous feed method of electrolytic aluminum production process according to claim 1, wherein the electrolyte comprises cryolite, alumina and an auxiliary agent.
3. The continuous feeding method for an electrolytic aluminum production process according to claim 1, wherein the flow rate of the extracted electrolyte is determined according to the addition amount of the solid alumina powder.
4. The continuous feeding method of the electrolytic aluminum production process according to claim 1, wherein an electrolysis area of the electrolytic tank is connected with a liquid guiding pipe and a liquid returning pipe, one end of the liquid guiding pipe and one end of the liquid returning pipe, which are positioned outside the electrolytic tank, are also connected with a feeding pipe, the liquid returning pipe is provided with a feeding pump, the liquid guiding pipe is used for leading out electrolyte in the electrolytic tank, the feeding pipe is used for adding solid alumina powder, and the liquid returning pipe with the feeding pump is used for returning the electrolyte mixed with the solid alumina powder to the electrolytic tank.
5. The continuous feeding method for electrolytic aluminum production process according to claim 4, wherein a hopper is installed at a feed inlet of the feed pipe, a wind-locking blanking machine is provided at a discharge outlet of the hopper, a blanking amount of solid alumina powder is controlled by rotation speed of the wind-locking blanking machine, and exhaust gas in the electrolytic tank is prevented from overflowing or air is prevented from entering through the wind-locking blanking machine.
6. The continuous feeding method for an electrolytic aluminum production process according to claim 4, wherein the electrolytic tank has a furnace wall, and a crust is provided inside the furnace wall.
7. The continuous feeding method for an electrolytic aluminum production process according to claim 6, wherein a cathode region of the electrolysis region is provided with a cathode steel bar and a cathode carbon block, an anode region of the electrolysis region is provided with a anode carbon block, one end of the cathode steel bar extends out of the furnace wall, the cathode steel bar is provided with the cathode carbon block, and the anode carbon block is arranged above the cathode carbon block.
8. The continuous feeding method for electrolytic aluminum production process according to claim 4, wherein the inlet and outlet pipe diameters of the liquid guiding pipe are determined according to the flow and the flow of the electrolyte.
9. The continuous feeding method for an electrolytic aluminum production process according to claim 1, wherein the addition rate of the solid alumina powder is determined based on the measured electrolyte concentration or based on the current of the electrolytic cell.
10. The continuous feeding method for electrolytic aluminum production process according to claim 4, wherein the liquid guiding pipe, the feeding pipe, the liquid returning pipe and the feeding pump are all provided with heaters in an auxiliary manner.
CN202211572907.6A 2022-12-08 2022-12-08 Continuous feeding method in electrolytic aluminum production process Pending CN116145196A (en)

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Application Number Priority Date Filing Date Title
CN202211572907.6A CN116145196A (en) 2022-12-08 2022-12-08 Continuous feeding method in electrolytic aluminum production process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211572907.6A CN116145196A (en) 2022-12-08 2022-12-08 Continuous feeding method in electrolytic aluminum production process

Publications (1)

Publication Number Publication Date
CN116145196A true CN116145196A (en) 2023-05-23

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CN202211572907.6A Pending CN116145196A (en) 2022-12-08 2022-12-08 Continuous feeding method in electrolytic aluminum production process

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