Device for supplying alumina to an electrolytic cell

专利摘要:
This invention relates to an alumina feeding device (10) for an electrolytic cell (100) comprising, a piercing component (22), a tubular sheath (23) surrounding the piercing component, the sheath having a lower opening and a first gas discharge opening (25), a duct (26) for feeding alumina into the tubular sheath (23) comprising a second alumina feeding opening and an orifice leading into the tubular sheath, wherein the tubular sheath (23) and the duct (26) are configured so that more than 90% of the gases entering the tubular sheath (23) through the lower opening (24) exit the tubular sheath (23) through the first gas discharge opening (25).
公开号:DK201970524A1
申请号:DKP201970524
申请日:2018-01-22
公开日:2019-08-30
发明作者:Renaudier Steeve；Brun Frédéric；Becasse Sébastian；Cote Patrice；Figue Jean-Pierre
申请人:Rio Tinto Alcan International Limited；
IPC主号:

专利说明:

DEVICE FOR SUPPLYING ALUMINA TO AN ELECTROLYTIC CELL
Technical field
The present invention relates to the general technical field of the production of aluminum by electrolysis in an electrolytic cell containing an electrolyte bath based on cryolite, and more specifically an alumina feeding device for this electrolytic cell.
The alumina feeding device can be mounted on an electrolytic cell with pre-baked anodes or on a continuous anode electrolytic cell known as a Söderberg cell.
Presentation of prior art
Aluminum is mostly produced by electrolysis of alumina dissolved in an electrolyte bath. Currently, the production of aluminum on an industrial scale is carried out in an electrolytic cell composed of a steel pot shell open in its upper part, and whose inside is covered with refractory material, and a cathode surmounted by one or more anodes, the anode being immersed in the electrolyte bath at a temperature ranging between 930 and 980°C.
An electric current is applied between the anode and the cathode to initiate the electrolysis reaction. The anode is gradually consumed during the electrolysis reaction. Once the anode is spent, it is replaced by a new anode.
In the production of aluminum by electrolysis, a solidified crust of alumina and solidified electrolyte forms on the surface of the electrolyte bath. The formation of this crust thermally isolates the electrolyte bath and confines some of the polluting gases generated by the electrolysis reaction.
However, the production of aluminum by electrolysis leads to a permanent change in the composition of the electrolyte bath, in particular in the alumina content of the electrolyte bath, since the alumina is consumed by the electrolysis reaction to form aluminum. The electrolysis reaction also produces gas at the interface between the anode and the cathode, for example carbon dioxide.
It is therefore necessary to add alumina to the electrolyte bath on a regular basis in order to stabilize and regulate the operating parameters of the electrolytic cell.
This is why an electrolytic cell is usually equipped with alumina feeding devices consisting of piercing devices for making holes by piercing the crust, and dosing devices for adding alumina in powder form through the holes.
Each piercing device usually comprises a jack and a piercing component (known by the names of plunger or chisel) attached to the end of a rod of the jack. The piercing
DK 2019 70524 A1 component is lowered by activating the jack to break the crust extending over the electrolyte bath.
Each dosing device typically comprises a metering unit to regulate the flow of alumina to be introduced into the electrolyte bath from a hopper and a feeding chute to direct the gravity flow of alumina from the metering unit to the hole formed in the crust by the piercing device. The piercing and dosing devices must be frequently cleaned and maintained due to the abrasive nature of the alumina and the extreme chemical and thermal conditions in the electrolytic cell.
Easy access to the piercing and dosing device is therefore sought, especially without the need for working directly inside the cell, i.e. under the containment hoods, to carry out cleaning and maintenance operations, in view of the great difficulty in working inside the cell resulting from lack of space, heat, gaseous fumes, differences in electrical potential and high magnetic fields that cause tools to stick.
In this regard, document FR 2 527 647 discloses a removable alumina feeding device comprising a piercing device and a metering unit arranged above the electrolyte bath in the ceiling of a superstructure supported by the pot shell. The piercing device and metering unit are arranged side by side, without touching each other, and can therefore be removed from the cell by vertical extraction independently of each other, i.e. without affecting the other device, either inside or above the vessel.
Alumina feeding devices are typically arranged at regular intervals along a central corridor between two rows of anodes. The anodes are coated with a powdery, typically cryolite and alumina based coating material to minimize heat loss from the electrolyte bath into the cell. This also minimizes the combustion of carbon-based anodes above the electrolyte bath. The powdery covering material may periodically collapse into the holes formed by the piercing devices. These collapses cause agglomerations to form on the surface of the cathode, which reduces its overall conductivity. This uncontrolled addition of powder also alters the composition of the electrolyte bath and disrupts the alumina feeding control system, resulting in a deterioration of the reaction efficiency of the electrolytic cell. These collapses can sometimes also cause the alumina feeding hole to become blocked and may cause the alumina feeding device to fail.
The holes pierced in the crust by the piercing devices form outlets for gases generated during the electrolysis reaction and trapped under the crust. Also, the exhaust flow of these gases is great around the holes in the crust and causes some of the alumina flowing by gravity from the feeding chutes to the holes to fly off. The alumina used for the production of aluminum is in fact in the form of very fine, light, easily volatile particles. Some of the
DK 2019 70524 A1 alumina coming out of the metering unit does therefore not reach the electrolyte bath but disperses inside the electrolysis tank, typically on the anode covering material. These uncontrolled fly-offs also disrupt the alumina feeding regulation system, resulting in a deterioration of the reaction efficiency of the electrolytic cell.
In order to improve control of the cells, alumina feeding control systems favor a quasicontinuous supply of alumina, i.e. by means of a trickle of alumina flowing almost continuously, rather than periodically introduced masses of alumina. A quasi-continuous alumina feeding device is notably disclosed in publication WO93/14248. The problem of flyoffs is therefore amplified because a trickle of alumina or isolated grains of alumina are more subject to fly-offs than a mass of alumina.
Publication CN102628170 discloses a piercing device with a sheath inserted into the powder coating material and through which the piercing component moves. The sheath prevents the coating material from collapsing into the hole in the crust formed by the piercing component. The metering unit and the piercing device are joined and, in particular, the duct between the alumina hopper and the sheath in which the alumina flows by gravity has no openings. Such a configuration prevents alumina from flying off between the metering unit and the sheath, but makes cleaning and maintenance operations very complex. Special attention must also be paid to the electrical insulation of the metering unit and the alumina feeding hopper due to the contact between the metering unit and the piercing device, the electrical potential of which fluctuates according to the position of the piercing component. The extreme chemical and thermal conditions in the electrolytic cell make this insulation very expensive and not durable.
One of the purposes of this invention is to provide an alumina feeding device that reliably controls the amount of alumina introduced into the electrolyte bath, and that is easy to maintain and simple in design.
Summary of the invention
To this end, the invention proposes a device for feeding alumina to an electrolytic cell for the production of aluminum including a piercing device comprising:
- a piercing component for piercing a hole in a solidified alumina and electrolyte crust forming above an electrolyte bath;
- a tubular sheath surrounding the piercing component, the tubular sheath having a lower opening and a first gas discharge opening to remove gases entering the tubular sheath through the lower opening;
- a feeding duct to feed alumina into the tubular sheath comprising a second alumina feeding opening and an orifice leading into the tubular sheath;
DK 2019 70524 A1 characterized in that the tubular sheath and the feeding duct are configured so that more than 90% of the gases entering the tubular sheath through the lower opening exit the tubular sheath through the first gas discharge opening.
Advantageously, the tubular sheath and the feeding duct are configured so that more than 95% and preferably more than 98% of the gases entering the tubular sheath through the lower opening exit the tubular sheath through the first gas discharge opening.
In particular, the tube sheath and feeding duct are designed, dimensioned and arranged in such a way that the pressure losses on the path of gases from the lower opening to the first gas discharge opening compared to the pressure losses on the path of gases from the lower opening to the second alumina feeding opening mean that more than 90%, preferably more than 95%, and preferably more than 98% of the gases entering the tubular sheath leave the tube sheath through the first gas discharge opening.
The reader will appreciate that in the context of the present invention:
- “opening” means an opening directly on the inside of the electrolytic cell.
- “first upper opening” means all openings in the tubular sheath which are suitable for gas evacuation, and are not used for the introduction of alumina. The cross-section of the first upper opening can therefore be the sum of the cross-sections of a plurality of openings.
- “cross-section” means the cross-section taken perpendicular to the axis of gas flow at that point.
In addition, the terms above and below will be used in relation to a vertical axis.
In particular, pressure losses are minimized on the path of gases from the lower opening to the first gas discharge opening, for example by forming a first large opening, by arranging the first opening in such a way that the length of the path of gases from the lower opening is minimized, and by not forming an elbow that constrains the gas flow from the lower opening to the first gas discharge opening.
Conversely, pressure losses can be induced on the path of gases from the lower opening to the second alumina feeding opening, for example by forming a cross-section restriction in the feeding duct, by using a long feeding duct, and by forming an elbow that constrains the gas flow from the lower opening to the second alumina feeding opening.
Advantageously, the first gas discharge opening has a cross-section greater than or equal to 0.5 times the cross-section of the lower opening. In this way, the gases generated by the electrolysis reaction flow vertically from the lower opening in the tubular sheath, with a substantially constant horizontal cross-section and identical to the cross-section of the lower
DK 2019 70524 A1 opening, to the outside of the tubular sheath through the gas discharge opening without encountering any significant narrowing. After this first gas discharge opening, the gases are no longer constrained by walls other than those far from the electrolytic cell.
The feeding duct preferably has a cross-section having, at least at one point, a cross-section less than one third of the cross-section of the first opening. Such constriction greatly increases the pressure losses of gas flow in the conduit compared to the pressure losses of gas flow towards the first opening and therefore limits the flow of gases in the conduit.
Preferably, the feeding duct should have over an entire portion a cross-section of less than one-third of the first opening. The gas flow in the conduit is even more limited.
The conduit cross-section is preferably dimensioned as close as possible to the crosssection necessary for the flow of alumina through the conduit without creating a clogging effect.
According to a particular embodiment, the feeding duct includes an angled portion. This angled portion increases the pressure losses associated with gas flow in the feeding duct.
According to a particular embodiment, the feeding duct extends vertically against the tube sheath for at least most of the length of the feeding duct. As a result, the tube sheath-feeding duct assembly is more compact and therefore easy to remove from the cell by extracting it vertically. The space required in the cell is reduced, as is the risk of impact and deterioration of the feeding duct during an anode change or operation on the cell. In addition, such a configuration also allows the orifice of the feeding duct leading into the tube sheath to be brought as close as possible to the lower opening, thereby limiting the distance over which the alumina particles are subjected to upward drag forces resulting from the ascending gas flow in the tube sheath. The fact that the feeding duct extends vertically over at least most of its length allows for a significant gravitational acceleration of the alumina particles in the feeding duct. The velocity reached by the alumina particles at the orifice in the tubular sheath allows the alumina particles to reach the lower opening and the surface of the electrolyte bath without being entrained by the ascending gas flow into the tubular sheath. This configuration therefore greatly limits the fly-off of alumina particles within the flow of cell gases to the outlet opening of the cell gases.
The orifice of the feeding duct is advantageously positioned in the tube sheath at a height lower than the top level of the covering material, i.e. close to the lower opening.
The second alumina feeding opening is open to the inside of the cell at a height higher than the upper level of the covering material, and preferably at a height higher than the upper level of the first opening. The length of the feeding duct is therefore great, which induces high pressure losses for gas flow through the feeding duct. This means that the gases are
DK 2019 70524 A1 evacuated naturally via the first gas discharge opening. Also, as the supply duct extends vertically against the tube sheath, the length of the supply duct minimizes the space required in the electrolytic cell. Advantageously, the feeding duct is formed in part by a wall of the tube sheath. This further reduces the spatial requirements and weight of the alumina feeding device.
According to a particular embodiment, the first gas discharge opening is formed in the tube sheath at a height higher than the height of the orifice in the feeding duct leading into the tube sheath. This prevents alumina particles flying off into the flow of cell gases to the outlet opening of the cell gases by simply deflecting the path of the alumina particles during their descent. In addition, insertion of covering material into the tubular sheath is avoided by positioning the first gas discharge opening well above the upper level of the covering material.
The orifice of the feeding duct leading into the tubular sheath and the first gas discharge opening are formed on either side of the axis of the piercing component. This maximizes the distance between the orifice of the feeding duct and the first opening, and minimizes flyoffs.
According to a particular embodiment, the first gas discharge opening is formed in the tubular sheath at the lower end of the piercing component when the piercing component is in the high position, or at rest. The first gas discharge opening also provides ventilation and therefore natural cooling of the piercing component. The use of a tubular sheath around the piercing component increases its overall temperature and such natural cooling is advantageous to avoid deterioration of the piercing device and in particular of the jack moving the piercing component.
According to a preferred embodiment, the alumina feeding device includes a dosing device comprising an alumina discharge opening which is distant from the second alumina feeding opening. Since the alumina discharge opening of the dosing device does not touch the alumina feeding opening of the piercing device, the dosing device does not need to be electrically insulated from the piercing device inside the cell. The dosing device, alternatively the piercing device, can also be removed from the cell without carrying out any work in the cell to detach the dosing device from the piercing device. The alumina discharge opening can be kept away from the second opening for the introduction of alumina because the gas flow leaving through the second alumina feeding opening of the piercing device is very low and does not interfere with the flow of alumina from the alumina discharge opening to the second alumina feeding opening, i.e. it does not cause any fly-off and uncontrolled dispersal of alumina in the cell.
DK 2019 70524 A1
According to a preferred embodiment of the invention, the dosing device comprises a metering unit and a feeding chute allowing alumina to be directed by gravity flow from the alumina discharge opening to the second alumina feeding opening.
According to a preferred embodiment of the invention, the feeding chute is configured so that the gravity flow of alumina leaving the alumina discharge opening includes a horizontal directional component. The feeding chute may, for example, include an inclined discharge ramp. The dosing device and piercing device can therefore advantageously be placed side by side without any part of the dosing device and the piercing device being superimposed in the cell. The dosing and piercing device can therefore be removed from the cell by extracting them vertically independently of one another, i.e. without affecting the other device, either in or above the cell.
In particular, the feeding chute can be of the type known from patent document WO93/14248 which delivers a thin, quasi-continuous trickle of alumina from sequential doses delivered by the metering unit.
According to a preferred embodiment of the invention, a deflection plate is placed above the second alumina feeding opening opposite the alumina discharge opening. This makes it possible to counter the horizontal directional component imposed on the alumina by the chute and allows the alumina to be properly received in the second alumina feeding opening. The size of the second alumina feeding opening and the overall dimensions of the piercing device can in this way be minimized.
The invention also relates to an electrolytic cell comprising anodes partially immersed in an electrolyte bath, covering material covering the anodes and the electrolyte bath, characterized in that the cell comprises an alumina feeding device as defined above and in that a lower portion of the tubular sheath is introduced into the covering material.
According to a preferred embodiment of the invention, the orifice in the feeding duct opens into the tubular sheath at a height lower than the upper level of the covering material. In this way, the distance over which the alumina particles are subjected to upward drag forces resulting from the upward gas flow in the tubular sheath is low.
According to a preferred embodiment of the invention, the lower edge of the first gas discharge opening extends between 5 and 30 cm above the upper level of the covering material. Such positioning is advantageous because it prevents the covering material from entering the tube sheath and therefore the electrolyte bath via this first gas discharge opening, and the distance between the lower opening and the first gas discharge opening is minimized.
DK 2019 70524 A1
Brief description of the figures
Other advantages and characteristics of the electrolytic cell and alumina feeding device will become apparent from the following description of an embodiment, given by way of a nonexhaustive example, from the attached drawings, in which:
- Figure 1 is a schematic cross-section view of an electrolytic cell with an alumina feeding device according to the invention,
- Figure 2 is an exploded perspective view of a portion of a piercing device according to the invention.
Detailed description
We will now describe an example of an electrolytic cell including one or more alumina feeding devices used for forming a hole in an alumina and solidified bath crust and to supply the cell with alumina.
In both figures, equivalent elements bear the same reference numerals.
Figure 1 illustrates an example of an electrolytic cell according to the invention.
The electrolytic cell 100 consists of cathode 1 on which an aluminum layer 2 is deposited as the electrolysis reaction progresses. The layer of aluminum 2 is covered by an electrolyte bath 3 in which anodes 4 are immersed. A crust 5 of alumina and solidified bath is formed on the surface of electrolyte bath 3 and covering material 6 is deposited on anodes 4 and crust 5.
The electrolytic cell 100 is equipped with an alumina feeding device 10 according to the invention, comprising a piercing device 20 and a dosing device 40. Piercing device 20 and dosing device 40 are partly arranged inside cell 100, under the tank ceiling 7.
Piercing device 20 comprises a jack 21, comprising a cylinder body 21a and a rod 21b, at the end of which a piercing component 22 extends. Piercing component 22 is lowered periodically by activating jack 21 to break crust 5.
Piercing device 20 also includes a tubular sheath 23 extending vertically around the piercing component 22 along its movement. Tubular sheath 23 has a lower portion inserted and embedded in covering material 6 and an upper portion extending above the covering material. Piercing component 22 partially exits the tubular sheath through a lower opening 24 to strike and pierce the crust. Figure 2 shows, in solid lines, the piercing component 22 in the upper position and in dotted lines the same piercing component 22 in the lower position.
DK 2019 70524 A1
The lower portion does not have a direct opening onto the inside of the cell and prevents the covering material from collapsing into the hole in the crust formed by piercing component 22. The upper portion has a first discharge opening 25 for gases deriving from the electrolysis process.
Piercing device 20 also has an alumina feeding duct 26 with a second opening 27 for feeding alumina and an orifice 28 leading into tubular sheath 23.
The dosing device 40 has an alumina discharge opening 41 which is distant from the second alumina feeding opening 27. Typically, the dosing device 40 consists of a metering unit 42 and a feeding chute 43, with the alumina discharge opening 41 corresponding to a free open end of feeding chute 43.
It has been found that when the tube sheath 23 and the feeding duct 26 are configured so that more than 90% of the gases entering tube sheath 23 through lower opening 24 leave tube sheath 23 through first gas discharge opening 25, alumina fly-off is drastically reduced, or even completely stopped, when alumina s discharged into the second alumina feeding opening 27 by means of a remotely arranged dosing device 40 having no contact with the piercing device. Preferably, the tubular sheath and the feeding duct are configured so that more than 95% and preferably more than 98% of the gases entering the tubular sheath through the lower opening exit the tubular sheath through the first gas discharge opening 25.
To this end, pressure losses are minimized on the path of gases flowing from lower opening 24 to first gas outlet opening 25 and maximized on the path of gases flowing from lower opening 24 to the second alumina feeding opening 27.
The particularly advantageous embodiment shown in Figures 1 and 2 shows, as a nonexhaustive example, several ways of arriving at this pressure drop ratio. According to the invention, these means may or may not be used jointly. The first gas discharge opening 25 is directly open into the tubular sheath and has a large cross-section, typically greater than or equal to 0.5 times the cross-section of the lower opening. The lower edge of the first gas discharge opening 25 extends between 5 and 30 cm above the upper level of the covering material. Feeding duct 26 is angled. Feeding duct 26 is long and has a small cross-section, typically less than one-third of the cross-section of the lower opening. Local constriction in the feeding duct, e.g. at orifice 28 in the tube sheath 23, also leads to high pressure losses.
Pressure drop charts and tables show that with such a differential in cross-sectional area and an angled portion, the pressure loss coefficient for a flow in feeding duct 26 is much higher than the pressure loss coefficient for a flow in the sheath up to the first gas discharge
DK 2019 70524 A1 opening 25, so that almost all the gases entering tubular sheath 23 through lower opening 24 exit the tubular sheath via the first gas discharge opening 25.
The feeding duct 26 extends vertically over most of its length against the tubular sheath 23. This allows the alumina to reach a high speed when discharging into the tubular sheath 23. Also, the overall dimensions of the piercing device are minimized and the orifice 28 of feeding duct 26 can lead into tube sheath 23 at a height lower than the upper level of the covering material 7, i.e. very close to electrolyte bath 3, while the alumina has been fed into feeding duct 26 via the second alumina feeding opening 27 which is open onto the inside of the cell at a height higher than the upper level of the covering material 6, and preferably at a height higher than the upper level of the first gas discharge opening 25. The wall of tubular sheath 23 can also form part of the feeding duct.
As can be seen in the figures, the first gas discharge opening 25 is formed in tube sheath 23 at a height higher than the height of orifice 28 in feeding duct 26 leading into tube sheath 23. Advantageously, orifice 28 of feeding duct 26 leads into the lower part of the tubular sheath 23 while the first gas discharge opening 25 is formed in the upper part of the tubular sheath.
Also, orifice 28 of feeding duct 26 and the first gas discharge opening 25 are formed on either side of the axis of movement of the piercing component. The first gas discharge opening 25 is formed in tubular sheath 23 at the lower end of piercing component 22 when the latter is in the high position, or at rest. This allows natural air convection cooling of the lower part of the piercing component, which comes into contact with the electrolyte bath when the piercing component is lowered. The part of tubular sheath 23 extending above first gas discharge opening 25 can also be highly perforated in order to cool jack rod 21b and prevent premature deterioration of jack 21.
Feeding chute 43 is used to direct alumina by gravity flow from alumina discharge opening 41 to second alumina feeding opening 27. In particular, feeding chute 43 may include an inclined discharge ramp so that the gravity flow of alumina from the alumina discharge opening 41 includes a horizontal directional component. A deflection plate 29 is placed above the second alumina feeding opening 27 opposite alumina discharge opening 41. The alumina discharged from feeding chute 43 then strikes this deflection plate 29 and enters feeding duct 26 via the second alumina feeding opening 27.
Dosing device 40 and piercing device 20 can therefore advantageously be placed side by side without any part of dosing device 40 and piercing device 20 being superimposed in the cell. The dosing and piercing device can therefore be removed from the cell by extracting them vertically independently of one another, i.e. without affecting the other device, either
DK 2019 70524 A1 in or above the cell.
The alumina feeding device described above therefore presents numerous advantages, in particular with reference to the operation of an electrolytic cell used for producing aluminum.

权利要求:
Claims (18)
[1] 1. An alumina feeding device (10) for an electrolytic cell (100) for the production of aluminum including a piercing device (20) comprising:
- a piercing component (22) for piercing a hole in a solidified alumina and electrolyte crust (5) forming above an electrolyte bath;
- a tubular sheath (23) surrounding the piercing component (22), the tubular sheath (23) having a lower opening (24) and a first gas discharge opening (25) to remove gases entering the tubular sheath (23) through the lower opening (24);
- a feeding duct (26) to feed alumina into the tubular sheath (23) comprising a second alumina feeding opening (27) and an orifice (28) leading into the tubular sheath (23);
characterized in that the tubular sheath (23) and the feeding duct (26) are configured so that more than 90% of the gases entering the tubular sheath (23) through the lower opening (24) exit the tubular sheath (23) through the first gas discharge opening (25).
[2] 2. Feeding device according to claim 1, wherein the tubular sheath (23) and the feeding duct (26) are configured such that more than 95%, and preferably more than 98%, of the gases entering the tubular sheath (23) through the lower opening (24) exit the tubular sheath (23) through the first gas discharge opening (25).
[3] 3. Feeding device according to either of claims 1 or 2, wherein the first gas discharge opening (25) has a cross-section greater than or equal to 0.5 times the cross-section of the lower opening (24).
[4] 4. Feeding device according to any of claims 1 to 3, wherein the feeding duct (26) has, at least at one point, a cross-section less than one third of the cross-section of the first gas discharge opening (25).
[5] 5. Feeding device according to claim 4, wherein the feeding duct (26) has over an entire portion a cross-section of less than one third of the cross-section of the first gas discharge opening (25).
[6] 6. Feeding device according to any of claims 1 to 5, wherein the feeding duct (26) comprises an angled portion.
[7] 7. Feeding device according to any of claims 1 to 6, wherein the feeding duct (26) extends vertically against the tubular sheath (23) for at least most of the length of the feeding duct (26).
DK 2019 70524 A1
[8] 8. Feeding device according to claim 7, wherein the feeding duct (26) is formed in part by a wall of the tubular sheath (23).
[9] 9. Feeding device according to one of claims 1 to 8, wherein the first gas discharge opening (25) is formed in the tubular sheath (23) at a height higher than the height of the orifice (28) of the feeding duct (26) leading into the tubular sheath (23).
[10] 10. Feeding device according to one of claims 1 to 9, wherein the orifice (28) of the feeding duct (26) and the first gas discharge opening (25) are formed on either side of the displacement axis of the piercing component (22).
[11] 11. Feeding device according to one of claims 1 to 10, wherein the first gas discharge opening (25) is formed in the tubular sheath (23) at the lower end of the piercing component (22) when the piercing component is in high position.
[12] 12. Feeding device according to one of claims 1 to 11, comprising a dosing device (40) comprising an alumina discharge opening (41) which is distant from the second alumina feeding opening (27).
[13] 13. Feeding device according to claim 12, wherein the dosing device (40) comprises a metering unit (42) and a feeding chute (43) to direct the gravity flow of alumina from the alumina discharge opening (41) to the second alumina feeding opening (27).
[14] 14. Feeding device according to claim 13, wherein the feeding chute (43) is configured such that the gravity flow of alumina leaving the alumina discharge opening (41) comprises a horizontal directional component.
[15] 15. Feeding device according to claim 14, wherein a deflection plate (29) is arranged above the second alumina feeding opening (27) opposite the alumina discharge opening (41).
[16] 16. Electrolytic cell (100) comprising anodes (4) partially immersed in an electrolyte bath (3), covering material (6) covering the anodes (4) and the electrolyte bath (3), characterized in that the cell (100) comprises an alumina feeding device (10) according to one of claims 1 to 15 and in that a lower portion of the tubular sheath (23) is inserted into the covering material (6).
[17] 17. Electrolytic cell according to claim 16, wherein the opening of the feeding duct (26) leads into the tubular sheath (23) at a height lower than the upper level of the covering material (6).
DK 2019 70524 A1
[18] 18. Electrolytic cell according to one of claims 16 or 17, wherein the lower edge of the first gas discharge opening (25) extends between 5 and 30 cm above the upper level of the covering material (6).

类似技术:

---

公开号 | 公开日 | 专利标题

---

US3681229A|1972-08-01|Alumina feeder

---

US6783656B2|2004-08-31|Low temperature operating cell for the electrowinning of aluminium

---

DK201970524A1|2019-08-30|Device for supplying alumina to an electrolytic cell

---

HU190845B|1986-11-28|Removable apparatus for precise supplying aluminium oxide into electrolite bath with the aim of producing aluminium

---

US8480876B2|2013-07-09|Aluminum production cell

---

JP3870026B2|2007-01-17|Molten salt electrolysis cell with liquid reservoir for metal

---

SE431444B|1984-02-06|DEVICE AT A GLASS FORMING CHAMBER

---

WO2004033761A2|2004-04-22|Point feeder and use of point feeder

---

CN1409777A|2003-04-09|Method and device for operating electrolytic cell

---

SE439539B|1985-06-17|PROCEDURE FOR MELTING OXIDE COMPOUNDS OF METALS OR NON METALS IN AN ELECTRIC OVEN AND OVEN FOR IMPLEMENTATION OF THE PROCEDURE

---

US4744876A|1988-05-17|Electrolyzer for extracting a substance from an electrolytic bath

---

US6572757B2|2003-06-03|Method for producing aluminum and electrolytic cell with improved alumina feed device

---

EP1567693B1|2006-03-22|Electrolytic cell with improved feed device

---

US1839756A|1932-01-05|Method of electrolysis of fused bath and apparatus therefor

---

CN103597125B|2016-04-27|The method of discharging for the gas pollutant limited from anode scrap and equipment thereof

---

US20090321273A1|2009-12-31|Method and an electrolysis cell for production of a metal from a molten chloride

---

US20210031278A1|2021-02-04|Drilling device comprising a tubular sheath secured to an actuator

---

DK201670543A1|2016-09-05|Device for drilling a crust of a cryolite bath that can be positioned on the periphery of an electrolytic cell

---

RU2728985C1|2020-08-03|Method of feeding electrolytic cell with alumina and device for its implementation

---

JP6933936B2|2021-09-08|Molten salt electrolytic cell

---

WO2006129267A2|2006-12-07|Electrolytic cell with improved feed device

---

RU2113551C1|1998-06-20|Electrolyzer for production of aluminium

---

CN110528030A|2019-12-03|A kind of Rare Earth Electrolysis device

---

PL131110B1|1984-10-31|Apparatus for automatic feeding the electrolytic furnaces with aluminium oxide

同族专利:

---

公开号 | 公开日

---

CN110225999A|2019-09-10|

---

EP3580373B1|2022-01-12|

---

EP3580373A4|2020-12-02|

---

FR3062137A1|2018-07-27|

---

EA201991764A1|2019-12-30|

---

CA3051784A1|2018-08-02|

---

FR3062137B1|2021-06-04|

---

EP3580373A1|2019-12-18|

---

AU2018213430A1|2019-08-15|

---

WO2018137025A1|2018-08-02|

---

EA037235B1|2021-02-25|

---

CN110225999B|2021-09-07|

---

AR110840A1|2019-05-08|

---

ZA201904582B|2020-12-23|

引用文献:

---

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

---

---

JPH06501742A|1990-10-05|1994-02-24|

---

CN201206171Y|2008-03-31|2009-03-11|贵阳铝镁设计研究院|Discharging device on prebaked anode aluminium electrolyzer|

---

NO332375B1|2008-09-19|2012-09-10|Norsk Hydro As|Spot feeder with integrated exhaust collection as well as a method for exhaust collection|

---

CN101724865B|2008-10-13|2012-07-04|高德金|Continuous feeding device for alumina|

---

EP2458034A1|2010-01-21|2012-05-30|Alstom Technology Ltd|A method of ventilating an aluminium production electrolytic cell|

---

CN202064012U|2010-12-23|2011-12-07|高德金|Inflow push-type aluminum oxide feeding device|

---

CN102011149B|2010-12-23|2015-12-02|高伟|Inflow push-type aluminum oxide feeding device|

---

CN102251257A|2011-01-17|2011-11-23|高德金|Aluminum cell with alumina setting feed opening|

---

CN202000000U|2011-01-17|2011-10-05|高德金|Aluminum electrolysis cell with alumina shaping blanking mouth|

---

CN102628170A|2011-10-18|2012-08-08|高伟|Embedding-type alumina feeding device|

---

CN202323058U|2011-10-18|2012-07-11|高伟|Embedded type aluminum oxide feeding device|

---

CN202440556U|2012-01-11|2012-09-19|高伟|Alumina burying type feeding device|

---

CN102560556A|2012-01-11|2012-07-11|高伟|Aluminum oxide embedded type feeding device|

---

CN105671594B|2016-01-12|2017-11-24|晟通科技集团有限公司|The continuous blanking equipment of aluminum oxide|FR3077018B1|2018-01-24|2020-01-24|Rio Tinto Alcan International Limited|DRILLING DEVICE COMPRISING A TUBULAR SLEEVE FIXED TO A CYLINDER|

法律状态:
2019-08-30| PAT| Application published|Effective date: 20190822 |

---

2021-01-11| PHB| Application deemed withdrawn due to non-payment or other reasons|Effective date: 20200806 |

优先权:

---

申请号 | 申请日 | 专利标题

---

FR1700067A|FR3062137B1|2017-01-24|2017-01-24|ALUMINA SUPPLY DEVICE FOR AN ELECTROLYSIS TANK|

---

FR1700067|2017-01-24|

---

PCT/CA2018/050070|WO2018137025A1|2017-01-24|2018-01-22|Device for supplying alumina to an electrolytic cell|

---