JPS58110686A - Method and device for preparing anode surface in aluminum manufacturing electrolytic cell - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for accurately adjusting the position of the anode surface of an electrolytic cell used in the production of aluminum by dissolving nine aluminum in molten cryolite (Hellou-Hall method), and Related to equipment.

In an electrolytic cell with a pre-fired anode, liquid Al 1 at the cathode
= What is the position of the anode surface facing the aluminum layer?

It needs to be adjusted periodically to take into account changes in several parameters, such as:

- the height of the aluminum layer that rises uniformly and falls sharply with 1 and tkK to remove the metal;

Gradual consumption of one anode surface; occurrence of polarization phenomena (backing) of one anode; - unevenness of current distribution on several anode surfaces; - local fluctuations in the temperature or composition of the bath.

- Unevenness in the contact resistance between the anode arad and the current lead; shape changes at the bath-metal interface caused by changes in the current diagram within a bath and within the metal;

Additionally, nearly all methods for adjusting electrolyzers for aluminum production work by varying the anode-to-anode distance.

French special FF FR, No. 935350, 95538
No. 8.

955689, 955690 (corresponding U.S. Patent No. 2
Minoh No. 411, No. 412, No. 413) (Hecine PECH
INEY) discloses a method and apparatus for adjusting electrodes of an electrolytic cell.

The internal resistance of the bath is measured and the current distribution between each anode is measured using a ratio meter with a crossed electric field, and a lift command is issued to each anode to correct the difference from the target value. Furthermore, by moving the electrode, it is possible to ensure the forced descent of the alumina in the tank and to obtain automatic power supply.

As a new technology based on the same idea as these patents, US WA Patent No. 2904490 (-LEOG
5UNNDAL), Near'/J Patent No. 1325158
No. CASEA), French Patent No. 1605666 (
= US wA Patent No. 3627666) (P)iXl:H
IM).

According to the current knowledge of JLK, in order to obtain a high yield, it is important for K to make the current distribution between the various anodes of the cypress as uniform as possible.

Current dog-shaped hinoki trees with multiple anodes require relatively frequent adjustments at the level of the anode or anodes to round to maintain an even current distribution as described above. Therefore, these all! The concept of controlling the l operation individually according to the value of the current flowing in each anode was reviewed, and based on this, the above-mentioned 1.
He achieved the invention of the Pescinet scam in 1944 and 1946.

Alcoa ALCOA French Permit R No. 247319
No. 4 (US Pat. No. 4,210,513) is fj! Ak
An eD anode pneumatic position I# adjustment device is disclosed. In that device, the motion of one motor is transmitted through a clutch to each jack, and each jack changes the height of its corresponding anode as required. All clutches are interlocked by a common adjustment command. This system has the following drawbacks.

The cost of the jack is high because the jack needs to have a large stroke corresponding to the level of anode wear, or more precisely the level of cow wear.

Note jacks with large strokes per jack become larger. This increases the height of the cypress and increases equipment costs.

A flexible and long zero current lead is required. Therefore, the track length of the conductor increases.

-The jacks are mechanically connected, which is more expensive than electrical connection.

- Regardless of what kind of adjustments you make.

The speed of the vertical movement is constant. Therefore, K, who performs individual fine adjustments, must reduce the duration of all other operations.

A first object of the present invention is to provide a method for accurately adjusting the anode surface of a bath used in the production of aluminum by electrolysis of alumina dissolved in molten cryolite. In such a vessel, the anode system includes a plurality of pre-fired anodes arranged in two parallel rows, the anodes being electrically connected to a cross-piece that ensures reliable current induction, and nine suspended rods. Equipped with The cathode surface of the cypress consists of the resulting liquid aluminum layer.

According to the method of the invention, the suspension rods of each anode or each group of anodes in each anode row are connected on the one hand to individual fishing rods for height adjustment and on the other hand to the suspension rods via flexible metal strips. Connected to the loss e-base for current feed, 2
In each of the two anode rows, individual small jacks are fixed to a horizontal rigid common frame, and the two common frames are connected to each other, and each rigid common frame can be connected separately. connected to a height adjustment means.

According to the method of the invention, by simultaneously and synchronously operating the height adjustment means of each rigid common frame and interrupting the power supply to the control means of the individual jacks while the adjustment means are in operation, Changing the distance between the cathode plane and the anode assembly.

Furthermore, according to the method of the present invention, in order to adjust the intensity of the current flowing through each anode or each anode group, the intensity of the current flowing through each anode or each anode group is measured, and the measured value is compared with a target value, A correction command is generated and supplied to each of the small jacks controlling the anode or anode group whose current intensity measurement value and target value do not match. Further, while the small jack executes the correction command, power supply to the height adjusting means of the two rigid common frames is interrupted.

Finally 1. e Tsukifugu (i.e., when the paddle's % anode effect occurs, the power supply to the control means of the individual fishing rod is interrupted, and the height adjustment means of each rigid common frame is separately and synchronously operated. Raise the frame by a predetermined height and simultaneously lower the other frames by a predetermined height.At this time, each frame is maintained in a horizontal position 111.Next, the lifting and lowering operation of the frame is reversed.Until the backing disappears. This alternating raising and lowering operation is repeated several times. Disappearance of the bucking is indicated by the restoration of the voltage at the terminals of the cypress to a value close to 4 volts. During this operation, the electrolyte level does not change.

Another object of the invention is to provide an apparatus for accurately adjusting the anode surface of cypress used in the production of aluminum by electrolysis of alumina dissolved in molten cryolite. In such a cypress, the anode system includes a plurality of prefired anodes arranged in two parallel rows.

Each anode is equipped with a hanging rond electrically connected to a crosspiece that ensures reliable current induction. The cathode surface of the cypress is composed of a layer of liquid aluminum formed.

The device of the present invention is:

a fixed erection member formed from at least one horizontal rigid beam with supports at each end; - each corresponding to one anode row and each supported on said erection member by a lever rod assembly; The structure is formed of two horizontal rigid members, each of which is moved vertically relative to the erection member by the lever rod assembly while maintaining its respective horizontal position. A common frame that is configured as much as possible.

and a separate control means connectable to the control par rod assembly.

a plurality of individual anode control means connected on the one hand to the common frame and on the other hand to a plurality of separate angler frames; and mechanical connection means between.

Depending on the cost, a rigid or articulated mechanical connection between two rigid members of a common frame.

- electrical connection means between the crosspiece and the anode suspension rod;

including.

(Left below) The superstructure of the cypress consists of a steel erection member formed from two horizontal rigid beams 1°1'. Both ends of the beam are 2
It is supported by two stands 2.2' (Fig. 4). An assembly consisting of rods 3, 3' and levers 4, 4' is fixed to each beam.

The lever supports a rigid common frame made of steel consisting of two tubular beams 5.5', each beam corresponding to a respective row of anodes, the two beams being connected to each other by tie bars 6. There is.

This connection may be a rigid connection as shown in FIG. 4, or may be an articulated connection. Rods 3, 3' and levers 4.4
The two systems 7 and 7' are actuated by two mechanical screws 7, 7' which are fastened to the stand 2 on one side of the erection member. Each jack raises and lowers the rigid frame 5.5' via an end lever 8, 8'. Lever 4
is fixed to the fixed beam via the pivot 4m and is connected to the two parts of the rod 3 by the pivot 4d and the lever 4d.
- Manipulate the tubular beam 5 via a link 40 which is connected to the beam 5 by a 1-4K link and a pivot 5a.

The end piece 8 is fixed to the fixed beam by a pivot 8m, and the jack 7 is fixed by a pivot 8b.
tiia and is fixed to the end of lever 3 by pivot 8cK.

The common frame 5.5' has a small amount of mechanical screws 9
The individual small frame 10 is supported through.

The electrolytic current is typically directed to the stationary crosspiece through a rigid diagonal member such as 11. The fixed crosspiece is made of aluminum and has two horizontal pars 12.12' connected to each other by equipotential tie bars 13.

Current is distributed to aluminum connector terminals 14 by flexible metal strips 15. The terminal 14 rests within the individual frame 10 and the anode rod 16 contacts the frame 10.

Tightening device 17 of the anode rod 16 to the individual frame 10
Any type of device known in the art may be used. For example, French Patent Publication No. 2039543 (D,
The apparatus described in U.S. Pat. No. 3,627,670 to DUCLAUXX may be used. In the illustrated case, the tightening screw is used in a horizontal rather than vertical position.

The frame will be raised on the page as described below, so
Anode rod 1 to ensure the passage of the rising anode current
A connecting device was arranged between 6 and the main crosspiece.

The device of the invention includes an aluminum contact strip 30 for each anode or group of anodes. The strip is
Also referred to as a temporary frame or auxiliary frame, it is powered by the main crosspieces 12, 12' and the flexible metal strip 31. This auxiliary frame 30 has beams 1, 1'
It is carried on a support which is rigidly connected to the holder, so that downward movement is completely prevented. There are 11 auxiliary frames!
, includes a simple small connector 32. The connector must be rounded to support the weight of the stationary anode! It has a lot of power and is therefore cheap. The small connector is the so-called connection means 3
Including 2, coughing means are 4 points 33゜34, BS,
It is pivoted at 3g to form a quadrilateral. Tightening
The relaxing movement is ensured by the rotation of the screw 3, which is controlled by a suitable person of simple construction. Each pear assembly consisting of a jack 9 and an individual frame IO supports a pair of anodes 18,19. However, this configuration is not necessarily required, and a configuration in which each shirt* controls three or more anodes or three or more anodes is also included within the scope of the present invention.

The individual fishing jacks 9 may have their respective electric motors or the movement of one motor distributed by a set of transmission shafts.

In the latter case, the transmission shaft and the inside of the shirt are connected via clutches, and each clutch controls activation or deactivation of the jack when one common motor rotates. Furthermore, it is possible to provide guide means for the anode rod.

The assembly of devices described above can perform four functions:

(1) When it is necessary to raise or lower the entire anode surface to change the anode-cathode distance according to the anode common control adjustment command, use the small jack 9.
Activate and display. The anode is rigidly connected to the common frame 5.5' and controls the cylinder and jack 7.7' simultaneously.

Shirt by mechanical joint 20:? Accurate synchronization between 7 and 7' is ensured. The two beams 5, 5' rise or fall simultaneously and synchronously, the anode surface moving parallel to itself. This mode of operation is equivalent to that obtained (by conventional mechanical means).

(2) “Un/Threatening”, that is, removal of the anode effect Al 1
It is known that the so-called "Q-tuking" or "polarization" or "anodic effect" phenomenon occurs in the Japanese cypress wood used in the production of tsugos. This causes a sudden increase in voltage at the terminals of the bath. That is, a voltage of about 4 volts increases to 35 or 40 volts. Current intensity decreases in correlation with this increase. This phenomenon disturbs the corresponding cypress and affects the entire electrolytic system. This is because a gas film is normally formed between the anodes.

Various methods are known for preventing anodic effects. Examples include adding alumina (in this case no immediate effect is obtained), blowing compressed air below the anode surface, introducing a wooden rod below the anode surface, or "poling". It is difficult to carry out "poling" work on existing cypress trees that are completely surrounded by a cover. There is also a method of separating the gas film by moving the anode. U.S. Patent No. 2, filed December 3, 1934. In Q61, No. 16, FERRAND proposed a method of swinging the anode. This method is effective and common, but difficult to implement. Although the currently commonly used method of raising and lowering the anode surface is effective, it has the drawback of causing changes in the electrolyte level.

In current hinoki with concentrated continuous power supply, the height of the bath liquid is relatively large and the ratio between the surface area of the anode and the total surface area of the bath is large. Therefore, a one degree change in the immersion of the anode results in a large change in bath height.

This, however, has several drawbacks.

It is necessary to deepen the crucible to prevent the overflow of the bath. This rounding increases the burden of capital investment.

A portion of the bath coats the top of the anode and solidifies. This ninth,
The volume of bath 1 decreases, and the ability of the bath to dissolve aluminum decreases. Such a coagulation bath layer covers the anode every time the anode is lowered, and the KFi becomes extremely large at the end of the anode's life. Therefore, additional and difficult operations are required to clean these anodes and reuse the coagulation bath. Furthermore, as the bath solution coating the anode wets the steel stud 21 (which serves as anode support and current lead), the stud r is corroded, thereby increasing the concentration of aluminum produced.

In the apparatus of the present invention, one anode row is lowered and another anode row is simultaneously raised by a strong height, so that "unbacking" can be performed while maintaining the liquid level of the bath constant.

At this ninth point, the joint 20 between the two jacks 7 and 7'
or replace them with cross joints that move these jacks by equal widths in opposite directions. A marking device such as a rotating calanter on a motor or any known moving measuring means may ensure the synchronization of the jacks and the matching of the levels of the anode surfaces of each anode row.

When the connection between the two rigid members of the common frame is rigid (FIG. 3), the common frame tilts slightly during lifting and lowering operations and thus also affects the anode surface.

However, this slope is extremely small, on the order of several orders of magnitude. Such alternating raising and lowering of the anode surface can cause horizontal movement of the bath without changing the liquid level.

When the connection between the two rigid members of the common frame is articulated, the anode surface remains perfectly horizontal during vertical lifting operations such as those described above. Similar results can, of course, be obtained when the two members of the common frame are mechanically independent.

It is possible to maintain the bathing position constant and perform unbacking in good condition by operating only the small jack 9 without using the common 7-frame control jack. In the tank where the %/Q difference/g occurred in 41, give a descending command to all the small jacks located on the right side of the short axis of the tank, and give the same command to all the small jacks located on the left side of the short axis of the oak. Give the command to increase the width, then perform the reverse operation. That is, a command to ascend to the right half and a command to descend to the right half are given. Repeat this operation until /q Tsukin〆 disappears.

In the conventional case and assuming that the cypress is arranged transversely to the axis of the electrolytic system, we operate with 20110 anodes downstream and 20 anodes upstream, but in the case of the present invention ( 20 anodes on the right (relative to the axis of the electrolytic system) and 20 anodes on the left (with respect to the axis of the electrolytic system).

(3), @Individual control of poles When the current intensity passing through one anode or a group of two anodes in the case shown deviates from the target value;
A computer-based coordination system generates coordination instructions. This causes the corresponding small jack 9 to rise or fall in the desired direction. During this operation, the jack 7.7' is not controlled and the common frame 5.5' remains stationary.

The width of the movement of each anode or anode group can be set according to the desired width. For example, a 280 anode row containing two anode rows of 20 anodes controlled as a group of 2
When used in a 1,000 amp electrolyzer system, the magnitude of the movement is set to ±30 millimeters.

I decided to slow down the rotation speed of these jacks! ':)
? It is possible to provide extremely high adjustment accuracy, and the current flowing through a pair of anode groups can be adjusted to 14,000 with an accuracy of ±1-.
Can be adjusted to amps. In these cypresses, the average distance between the anode and cathode aluminum layers is about 40 millimeters.

(4) Anode power supply while the frame is rising As the anode wears out, the common frame gradually descends.

Therefore, it is necessary to periodically return these frames to the raised position. This operation, commonly referred to as frame elevation, is
An electrolytic bridge is carried out using a beam guided into the bath to maintain the anode at its own level. The beam is supported on a cypress superstructure with a gripping cover for the anode. This kind of beam is 41, ALUMINIUMPECHI6T O
7? /S41 Permit No. 1445602 (corresponding US)
14I Permit No. 34349558).

Securing the anode to the axillary beam and then cutting the main connection of the anode rod to the movable assembly, common jack 7.7
Back the common frame 5.5' with the apex groove of the stroke using '.

Two major drawbacks arise with this method, such as underline wiring.

A. During the raising operation, the power transfer from the crosspiece to the lift F is done through the same contacts as in the case of the cypress no-mill operation. Therefore, this contact line is prone to slipping. Furthermore,
Despite the use of a lift beam, the pressure exerted by the rod on the crosspiece is small compared to the pressure exerted by the conductor, so the quality of the contact is poor. In addition to this slippery and poor quality contact, energy losses often occur, further accelerating the deterioration of the contact surface. On the other hand, in the case of R-turning, the voltage at the oak terminals increases significantly, so that the risk of deterioration during the raising operation is even greater.

B. Since the beam is a heavy member with a large lid, an energy introduction part is required to operate the mechanism. The energy introduction is therefore operated together with an electrolytic bridge. Since the raising operation takes a relatively long time, the proportion occupied by one bridge increases and thus the number of bridges in one electrolyte system decreases. Furthermore, since the lift beam and bridge are placed on top of the paddle, it is not possible to build another bridge above the paddle. This also becomes a restriction on use.

The presence of the auxiliary frame 30 facilitates such a frame raising operation. In this lifting operation, the anode rod 16 is first tightened to the auxiliary frame 30 using the connector 32.

The anode is therefore electrically connected to the main feeder 12 and mechanically connected to the auxiliary frame and thus the fixed beam IK.
Next, the main connector 17 is loosened and the connecting blocks 10, 14 of the common frame 5, the individual jacks 9 and the anode rod are raised. Next, the main connector 17 is tightened again and the auxiliary connector 32 is loosened.

Manual or mechanized attachments may be provided to prevent electrical contact between the anode rod 16 and the auxiliary frame 30 and to separate the auxiliary frame 30 from the anode rod F16.

Since the tools required to raise the frame consist only of manual or mechanized tools for tightening and loosening the connectors, two disadvantages of prior art devices as described above are eliminated. That is, the lifting operation of the frame is carried out independently of other operational operations and the electrolytic bridge, and a free direct passage of current is always ensured, regardless of what stage the lifting operation is in. .

In addition to the four main functions mentioned above, the device which is the object of the present invention also has the advantage that the small jack 9 and the common frame 5 are
The electrical connection between the flexible metal strip 15 and the anode plate 1'16 can be easily severed and the connection between the flexible metal strip 15 and the anode plate 1'16 can be easily severed until the anode is placed over the cathode and preheated. Maintain the connection and allow the anode to expand and move freely.

Furthermore, the connection between the small jack 9 and the individual small frame lO is made by connecting the anode rod 16 and the aluminum connector terminal X.
Care may be taken to leave some freedom in the anode without compromising the electrical contact between it and the electrode. Even if the anode position is inaccurate, the voltage drop across the anode-crosspiece 12 junction remains small.

Furthermore, it is possible to raise the anode slightly before replacing the anode or immediately before the operation. The current through the anode is substantially reduced, preventing degradation of the terminal 14 due to arcing effects as the prad 16 moves away from the terminal 14.

Finally, the height of the terminal 14 is small compared to the height of conventional crosspieces. This allows the height of the cypress to be reduced, the anode red to be shortened, and the length of the conductor circuit to be shortened. Therefore, it is possible to significantly reduce the initial capital investment and the voltage drop during operation.

After all, according to the present invention, the position of the anode can be precisely adjusted at any time, the current flowing to each anode or anode group can be controlled, and SO can be quickly unloaded without causing changes in the electrolyte level. to ensure stable operation and optimum efficiency, and periodic lifting of the frame can be carried out without the use of a weight support and while ensuring free and direct passage of the anode current.

[Brief explanation of drawings]

FIG. 5 is a schematic partial perspective view of the device of the present invention from which means which are known per se and are not the purpose of the present invention, that is, the means for fixing the anode rod to the small frame are omitted; FIG. 2 is an individual fishing jack for controlling the anode; Figure 183 is a cross-sectional view of the rigid tie bar connecting two rigid members of the common 7 frame, Figure 4 is a side view of the control jack of the two common frames, Figure 1g5 is A cross-sectional view of the position of the auxiliary frame, and FIG. 6 is a plan view of the lift connector. 1.1'...beam 2,2/...stand, 3
．． 3'...Rod, i, 4'...Lever, 5.5
'... Frame, 6... Tie bar, 7.7'.
...Jacket, &8/...Lever, 9...Jacket, lO...Small frame, 12.12'...Horizontal par, 13...Tie/-1lto...Connector terminal, 15 ...metal strip, 16...anode rod, 1 &19'-・°anode, ri...joint, (fund)・
...Auxiliary frame. 4 Continuation of page 1 Priority claim @ May 27, 1982 ■ France (FR
)■82 09699 Mr. Kazuo Wakasugi, Commissioner of the Chamber of Commerce 1, Indication of the case 1982 Patent Application No. 211187
No. 2, Title of the invention Method and device for adjusting the anode surface of an electrolytic cell for aluminum production 3, Relationship with the amended case Patent applicant name Aluminum Becinet 4, Agent 1-1 Shinjuku, Shinjuku-ku, Tokyo 14
No. Yamada Building 5, Date of amendment order Vol. 6, Number of inventions increased by amendment 2, Claims (1) An anode system having a plurality of pre-fired anodes arranged in two parallel rows. The anode is equipped with a suspension rod that is electrically connected to a crosspiece that ensures reliable current induction, and the cathode surface is composed of a layer of liquid aluminum formed in the melted cryolite. Ninth, in order to precisely measure the anode surface of an electrolytic cell for producing aluonium by electrolysis, in each anode row, connect the suspension rod of each anode or each anode group to an individual fishing rod on one side, and connect the suspension rod on the other side. Connecting the flexible metal strip to the positive current inducing crosspiece via and the individual fishing jacks of each of the two anode rows to the horizontal rigid common frame 'M#! and connecting two rigid common frames to each other; and connecting each of the rigid common frames to separate connectable height adjustment means. How to accurately adjust the surface. (2) Operate the respective height adjustment means of the rigid common frame synchronously and interrupt the power supply to the control means of the individual fishing jacks while the adjustment means of the rigid common frame are in operation.Therefore, the cathode surface and the anode A method for accurately adjusting an anode surface as claimed in claim 1, characterized in that the distance between the assembly and the anode surface is varied. (3) Measure the intensity of the current flowing within each anode or each anode group, compare the measured value with the target value, generate a correction command, and remove the anode or anode group with the current intensity that does not match the target value. Each of the individual fishing jacks to be controlled sends out a correction command, and while the small jack executes the correction command, the power supply to the height adjustment means of the two rigid common frames is interrupted. Claim 1, characterized in that the intensity of the current flowing through the group is adjusted. Accurate adjustment method for the anode surface described by TJK. (4) When backing of the cypress (i.e., "anode effect") occurs, the control means of the individual fishing hand jacks are shut off, and the height adjustment means of each of the rigid common frames are operated separately and synchronously, and each frame is leveled. and while maintaining the liquid level in the molten cryolite tower constant, raise one frame by a predetermined height, simultaneously lower the other frame by the same height, and then perform the reverse lifting and lowering operation. Thereafter, when the terminal voltage of the cypress returns to a value of about 4 volts, the above-mentioned lifting and lowering operation is repeated a plurality of times until the e-turning clearly disappears. How to accurately adjust the anode surface as described in section. (5) When knocking (i.e., "anode effect") occurs in the cypress, each height adjustment control means of the rigid common frame is shut off, and the cypress is removed while the liquid level in the molten cryolite tower is maintained constant. gives a command to all the small jacks located on one side of the short axis of the system to rise, and at the same time gives a command to all the small jacks located on another @ of the short axis of the system to descend in synchronization with the rise and with an equal movement width,
Next, the reverse operation is performed, that is, the descending command on one side of the short axis and the ascending command on the other side, and after that, the disappearance of the 7e-tsuking becomes clear as the terminal voltage of Hinoki returns to the value of about 4 volts. 2. The method for accurately adjusting an anode surface according to claim 1, wherein said lifting and lowering operation is repeated multiple times until the anode surface is adjusted. (6) To carry out the method for accurately adjusting the anode surface of cypress wood used in the production of aluminum by electrolysis of alumina dissolved in molten cryolite according to any one of claims 1 to 5. , - at least one with supports at both ends
a fixed erection member formed from horizontal rigid beams; and two horizontal members whose restraints correspond to one anode row and each supported on said fixed erection member by a lever rod assembly. a common frame formed of rigid members, the two rigid members being configured to be movable up and down with respect to the erection member by the lever rod assembly while maintaining their respective horizontal positions; and separate control means connectable to the control/paddle-rod assembly; and multiple fiAs connected on the one hand to a common frame and on the other hand to a plurality of individual subframes. - electrical and mechanical connection means between the individual subframes and the anode suspension frame; - electrical connection means between the crosspiece and the individual subframes; Equipment that includes **. (7) The electrical manufacturing device according to claim 6, further comprising mechanical coupling means between the two rigid members of the common frame. (8) Claim 6, characterized in that the connection means between the two rigid members of the common frame are rigid.
The equipment described in section. (9) Claim 6, characterized in that the mechanical connection means between the two rigid members of the common frame is of an articulated type.
The equipment described in section. 7. Device according to claim 6, characterized in that the electrical connection between the crosspiece and the individual small frames is secured by means of flexible metal IJ tabs. 6B Each anode or group of anodes includes an auxiliary frame, said auxiliary frame being powered from the main crosspiece by a visible metal strip and rigidly connected to the horizontal beam and supporting The device according to any one of claims 6 to 10, characterized in that: 12. The device of claim 11, wherein the auxiliary frame further includes a connector for establishing direct electrical contact between the auxiliary frame and the anode rod.

Claims (9)

[Claims] (1) The anode system has a plurality of prefired anodes arranged in two parallel rows, and the anodes are provided with a suspension rod electrically connected to a crosspiece that ensures reliable current induction. In order to accurately adjust the anode surface of the electrolytic cell for producing rum, the cathode surface is formed by the electrolysis of molten alumina in molten cryolite, which is composed of a good liquid aluminum layer. The suspension rod of each anode or each group of anodes is connected on the one hand to an individual fishing jack and on the other hand to a positive current inducing crosspiece KI via a flexible metal strip.
connecting the individual fishing rods of each of the two anode rows to a horizontal rigid common frame; and connecting the two rigid common frames to each other; A method for precisely adjusting the anode surface of an electrolytic cell for aluminum production, characterized in that each is connected to a separate and freely communicatable height adjustment means. (2) By synchronously operating the height adjusting means of each of the rigid common frames and interrupting the power supply to the control means of the individual fishing jacks while the yiIin means of the rigid common frame is in operation, the cathode surface and anode assembly are assembled. The method for accurately adjusting the anode surface O according to claim 1, characterized in that the distance between the anode surface O and the anode surface O is changed. (3) Measure the intensity of the current flowing through each anode or each anode group, compare the measured value to the target value, generate a correction command, and select an anode or anode group with a current intensity that does not match the target value. The above-mentioned correction command is sent to each of the individual fishermen Jatsuki to control, and while J. Jatsuki executes the correction command, it is 2.
The intensity of the current flowing through each rII 111 or each anode group is adjusted by interrupting the power supply to the height adjustment means of the seven rigid common frames. Accurate adjustment method. (4) When /q-picking (i.e., "anode effect") occurs in the tank, the control means for the individual fishing hand jacks is cut off, and the height adjustment means of each of the rigid common frames are operated separately and synchronously, and each frame While keeping the molten cryolite tower horizontal and the liquid level in the molten cryolite tower constant, raise one frame by a predetermined height, simultaneously lower the other frame by the same height, and then perform the reverse lifting and lowering operation. After that, the terminal voltage of the tank is about 4
2. A method for accurately adjusting an anode surface according to claim 1, wherein said lifting and lowering operation is repeated a plurality of times until the disappearance of the Q-tuning is clearly confirmed by returning to the value of volt. (5) Bucking of the paddle (i.e., "anode effect") interrupts the regulation control means and rises to all the small jacks located on one side of the short axis of the cypress while maintaining the molten cryolite tower C liquid level constant. The command is given, and at the same time all the small jacks located on the other side of the short axis of the system are given a lowering base with a rich movement width in synchronization with the above-mentioned rise, and then the reverse operation is performed, i.e., on one side of the short axis. Executing the T-down command and the raising command on the other side, and thereafter repeating the above lifting and lowering operations several times until the disappearance of the bucking is revealed by the terminal voltage of the cypress returning to a value of about 4 volts. A method for accurately adjusting an anode surface according to claim 1, characterized in that: (6) Accurate pl of the anode surface of cypress wood used for aluminum production by electrolysis of alumina dissolved in molten cryolite according to any one of claims 1 to 5 C! !
In order to implement the method, - a fixed erection member formed from at least one (1!) horizontal rigid beam with supports on both sides, each corresponding to one anode row; and each formed of two horizontal rigid members each supported by a lever rod assembly to said fixed erection member, said two rigid members maintaining their respective horizontal positions while said lever rod a common frame configured to be moved vertically relative to the erection member by the assembly; and separate control means each connectable to the par rod assembly; On the other hand, multiple −
multiple-0tS separate anode lifting control means connected to the individual subframes KIl; - electrical and mechanical connection means between the individual subframes and the anode suspension rods; an electrical connection means between the crosspiece and the individual small frame; Equipment that contains only a small percentage of 7. The apparatus of claim 6 further comprising mechanical coupling means between the two rigid members of the common frame. (8) A device according to claim 6, characterized in that the C mechanical coupling means between the two rigid members of the common frame are rigid. (9) Claim 6, characterized in that the mechanical connection means between the two rigid members of the common frame is of an articulated type.
The equipment described in section. 7. Device according to claim 6, characterized in that the electrical connection between the crosspiece and the individual subframes is ensured by a flexible metal strip. αυ Each anode or anode group includes an auxiliary frame, said auxiliary frame being powered by a flexible metal strip from the main crosspiece) and supported on supports rigidly connected to the horizontal beam. The device according to any one of claims 6 to 10, characterized in that: a2 The auxiliary frame further connects the auxiliary frame and the anode rod to 01! 12. Device according to claim 11, characterized in that it includes a connector for ensuring electrical contact.