EP1678350A2 - Method and system for controlling addition of powdery materials to the bath of an electrolysis cell for the production of aluminium - Google Patents
Method and system for controlling addition of powdery materials to the bath of an electrolysis cell for the production of aluminiumInfo
- Publication number
- EP1678350A2 EP1678350A2 EP04787471A EP04787471A EP1678350A2 EP 1678350 A2 EP1678350 A2 EP 1678350A2 EP 04787471 A EP04787471 A EP 04787471A EP 04787471 A EP04787471 A EP 04787471A EP 1678350 A2 EP1678350 A2 EP 1678350A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- control method
- actuator
- determined
- abnormal
- bath
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Definitions
- the invention relates to the production of aluminum by igneous electrolysis according to the Hall-Héroult process. It relates more particularly to the control of the addition of pulverulent materials in an electrolyte bath of the electrolysis cells.
- the objective of this stabilization is, in particular, to obtain a Faraday yield as high as possible and to avoid the effects of anodes caused by an alumina defect in the bath and the accumulation of alumina "sludge" at the tank bottom caused by an excess of alumina.
- Alumina and bath compounds are generally introduced into the bath in powder form.
- Several methods and devices are known for "supplying" electrolysis cells with powdery materials in an automatic and controlled manner.
- the following patent applications in the name of Aluminum Pechiney, describe methods for regulating the addition of alumina, aluminum fluoride or other: FR 2,749,858 (corresponding to US patent 6,033,550), FR 2,581,660 (corresponding to US patent 4,654,129), FR 2,487,386 (corresponding to US patent 4,431,491), FR 2,620,738 ( corresponding to US Pat. No. 4,867,851) and FR 2,821,363.
- the electrolysis cells are equipped with one or more distributors of pulverulent materials associated with a piercing device.
- frozen alumina and electrolyte crust covering the surface of the bath during normal operation.
- the piercing device generally comprises a jack and a pricker (or “plunger") fixed to the end of the rod of the jack.
- the plunger is lowered by actuation of the cylinder and breaks the crust of alumina and solidified bath. This operation can be repeated several times and regularly so as to keep the powdery material introduction hole open.
- Patent applications FR 1 457 746 (corresponding to patent GB 1 091 373) and FR 2 504 158 (corresponding to patent US 4435 255) and US patent 3 400 062 describe such devices.
- the piercing device does not allow the introduction of the pulverulent material into the bath.
- the hole is blocked by an alumina bread agglomerated with a solid bath, which hinders the "supply" of powdered baths to the bath.
- the piercing device may also be defective. It has been proposed to take account of such operating anomalies by electrical measurements capable of detecting whether the plunger has actually come into contact with the electrolyte. For example, in patent application FR 2 483 965 (corresponding to US patent 4 377 452) in the name of Aluminum Pechiney, the contact between the electrolyte and the plunger is detected by an electrical measurement between the pricker and the cathode.
- the subject of the invention is a method of controlling the addition of pulverulent materials in an electrolysis cell intended for the production of aluminum by igneous electrolysis and provided with at least one distributor of pulverulent materials and at least one device for piercing comprising an actuator and a pricker, said cell containing a liquid electrolyte bath and being conducted so as to form an alumina and solidified bath crust above the liquid electrolyte bath, process in which at least one forms an opening in said crust using the piercing device and powdery material is introduced through at least one opening according to a determined procedure for introducing additions, designated by the expression "normal feeding procedure", and characterized in that :
- an electrical signal S is generated capable of causing the prick to descend using the actuator
- the pulverulent materials are typically powder based on alumina (such as pure or fluorinated powdered alumina), powder of aluminum fluoride (A1F 3 ) or powder based on cryolite (called “bath powder ", which may optionally contain alumina and / or one or more other compounds).
- Said feeding procedure may relate to the additions of several different pulverulent materials.
- the invention also relates to a system for controlling the addition of pulverulent materials in an electrolysis cell intended for the production of aluminum by igneous electrolysis and provided with at least one distributor of pulverulent materials and at least one device.
- piercing device comprising an actuator and a pricker, said cell containing a liquid electrolyte bath and being conducted so as to form an alumina and bath crust solidified above the liquid electrolyte bath, characterized in that it includes:
- a means for generating an electrical signal S capable of causing, at a determined time t 0 , the descent of the pricker using the actuator
- a device for measuring the moment t at which the pricker reaches a determined low position P - means for determining the value of at least one operating indicator of the feed F (t 0 , t) from the value of time t 0 and the value obtained for time t.
- the Applicant has had the idea of using an operating indicator based on the movement of the pricker, and in particular on the travel time of the pricker between an initial position Po and a determined position P.
- an operating indicator makes it possible to easily obtain a simple diagnosis on the functioning of the power supply at a given nozzle.
- the method of the invention also makes it possible to maintain monitoring of the operation of the power supply even during anode effects. It is particularly easy to automate.
- FIG. 1 illustrates a typical electrolysis cell intended for the production of aluminum by igneous electrolysis, seen in vertical section.
- FIG. 2 represents a partial interior view of a typical electrolysis cell intended for the production of aluminum by igneous electrolysis, seen in vertical section.
- FIG. 3 illustrates a system for controlling the addition of pulverulent materials according to the invention.
- FIG. 4 illustrates the operation of the control method according to the invention.
- Figures 5 and 6 illustrate the structure and operation of a drilling device capable of implementing the invention.
- an electrolysis cell (1) for the production of aluminum by igneous electrolysis comprises a tank (12), anodes ( 2) and means for supplying pulverulent materials (20, 30).
- the anodes (2) - typically prebaked anodes made of carbonaceous material - are supported by a rod (3) to an anode frame (9).
- the electrolytic cell (12) comprises a metal box (8), typically made of steel, internal covering elements (13, 14) and a cathode assembly (5, 15).
- the cathode assembly (5, 15) comprises connection bars (15), called cathode bars, to which are fixed the electrical conductors (16, 17) serving for the routing of the electrolysis current lo.
- the coating elements (13, 14) and the cathode assembly (5, 15) form, inside the tank (12), a crucible capable of containing the electrolyte bath (7) and a sheet of liquid aluminum (6) when the cell is in operation.
- electrolysis cells are generally arranged in line and electrically connected in series using connecting conductors (16, 17).
- the cells are typically arranged to form two or more parallel lines.
- the electrolysis current lo thus cascades from one cell to the next.
- the anodes (2) are normally partially immersed in the liquid electrolyte bath (7) and the cells are conducted so as to form a crust of alumina and solidified bath (10) above the bath of electrolyte.
- the electrolysis current lo flows through the electrolyte bath (7) via the anode frame (9), anode rods (3), anodes (2) and cathode elements (5, 15) .
- the aluminum produced by the electrolysis of the alumina contained in the bath (7) is gradually deposited on the cathode assembly (5) and forms a sheet of liquid metal (6).
- the normal feeding procedure typically involves the addition of predetermined amounts of pulverulent material, at a constant or variable rate.
- the quantities, which are typically doses are generally determined from measurements on the cell, such as temperature measurements, electrical measurements, analyzes of the composition of the bath and / or measurements of the height of the liquid bath. .
- alumina supplies so as to maintain the alumina concentration of the electrolyte within determined limits, typically between an upper limit and a lower limit.
- Most of the known industrial processes use an indirect evaluation of the alumina content of the electrolyte bath using an electrical parameter representative of the alumina concentration of the electrolyte.
- This parameter is generally an electrical resistance R which is determined from a measurement of the voltage U at the terminals of the electrolysis cell and of the intensity of the current lo which passes through it.
- R electrical resistance
- Patent applications FR 2 749 858 (corresponding to US patent 6 033 550), FR 2 581 660 (corresponding to US patent 4 654 129) and FR 2 487 386 (corresponding to US Patent 4,431,491) in the name of Aluminum Pechiney describe control methods using electrical resistance measurements. These methods use the measured values of the resistance R, and in particular the evolution of these values, to determine the rate of supply of alumina to be used at any time.
- the procedure for introducing the additions determined may be any method of regulating the additions of pulverulent materials in the bath of an electrolysis cell, such as those described in the patents mentioned above.
- the electrolysis cells (1) suitable for implementing the control method according to the invention comprise at least one distributor of powdery materials (20) and at least one piercing device (30) . These elements are generally attached to a superstructure (4).
- the powder distributor (s) (20) typically comprise a hopper (21), intended to contain a reserve of pulverulent material, and a chute (22) fixed to the lower part of the hopper and intended to convey the pulverulent material to near an opening (11) in the crust (10).
- Each piercing device (30) comprises an actuator (31) and a pricker (33) (also called a “plunger") fixed to the end of the rod (32) of the actuator.
- the actuator (31) is typically a pneumatic actuator, such as a pneumatic cylinder.
- a powder distributor can be associated with one or more specific stitching devices or, conversely, a stitching device can be associated with one or more specific powder distributors.
- the electrolysis cells are frequently fitted with one or more devices grouping together a powdery material distributor and a stitching device; these devices are known under the name of pitting and feeding devices ("Crustbreaking and Feeding Device" in English).
- the rod (32) of the actuator (31), and therefore the stitcher (33) has at least a first position, called “waiting position", and at least a second position, called “position of perforation ". Normally, the first position is a high position and the second position is a low position. Activation of the actuator (31) causes the rod (32) to descend or rise, and therefore the rod to pass from the first to the second position or vice versa.
- the dimensions of the device are such that, when the rod is in the first position, the nozzle does not obstruct the flow of the pulverulent material leaving the chute (22) and, when the rod is in the second position, the nozzle (33) passes through the normal thickness of said crust (10), which makes it possible to form an opening (11) suitable for the introduction of pulverulent material into the electrolyte bath (7).
- the actuator (31) is activated by a fluid supply (39), generally a compressed air supply, which is controlled by means of a valve (38), typically a valve.
- the actuator (31) is connected to the supply (39) by at least one specific supply duct (35) which, typically divides in two near or at the level of the actuator so as to be able to cause the pricker to descend and rise.
- the invention relates more specifically to controlling the introduction of said pulverulent materials into the electrolyte bath (7), which depends very particularly on the quality of the openings (11) in the solidified bath crust (10) and the operation of the piercing devices (30) used to form and maintain them.
- the control method according to the invention can be used intermittently (it can, for example, only be used when the regulation is in a continuous regime).
- an electrical signal S is generated capable of causing the descent of the pricker (33) using the actuator (31).
- This signal is generated at a determined time t 0 compatible with the general regulation of the supply of pulverulent materials.
- the signal S typically takes the form of a step (as illustrated in FIG. 4).
- the pricker (33) is moved by the actuator (31) from an initial position Po to a final position Pf, normally passing through a determined position P, called the lower position, which may be different from the final position Pf (see Figures 4 to 6).
- the time t at which the pricker reaches said determined position P is measured and the value of at least one operating indicator of the supply F is determined from the value of t 0 and that obtained for the moment t.
- the electrical signal S can transmit the order of descent of the pricker by electrical, optical, pneumatic or other means, generally by means of a transmission means (34) which is illustrated diagrammatically in FIG. 3.
- the determined low position P is typically the position at which the nozzle (33) comes into contact with the liquid electrolyte bath (7) or the lowest position allowed by the actuator (31). These positions normally correspond to said second position, that is to say the position of perforation.
- the initial position Po of the pricker that is to say the position of the pricker (33) at the moment when the signal S of displacement of the prickler is generated, is typically said waiting position.
- the position of the pricker (33) can be given relative to a determined reference point Yo.
- the actuator (31) is activated using an electrical signal VG, which acts directly or indirectly on a valve (38), typically a solenoid valve.
- the electrical signal V G contains the signal S intended to trigger the movement of the pricker.
- the position of the breaker (33) is measured using at least one position detector (40, 40 '), which can be integrated into the drilling device (30).
- the or each position detector (40, 40 ′) generates a signal SA representative of the position of the pricker (33) or of specific positions of the pricker (33).
- the signal S A can be an electrical, optical or other signal. This signal is then used to determine the moment t at which the stitcher reaches the determined low position P.
- the operation can be judged abnormal if the descent time D is found to be greater than a determined high threshold Sh in at least Nh successive determinations.
- the number Nh is typically an integer inclusive between 1 and 10.
- the operation can be judged abnormal if the descent duration is found to be greater than a determined threshold Sh 'in at least Nh' determinations on N, that is to say if the ratio Nh '/ ⁇ is greater than a given Rh value. It is then a "density" of anomalies, given by the ratio ⁇ h '/ ⁇ , which can be expressed as a percentage.
- the operation can be judged abnormal if the descent duration is found to be less than a determined low threshold Sb in at least Nb successive determinations.
- the number Nb is typically an integer inclusive between 1 and 10.
- the operation can be considered abnormal if the moment t cannot be measured after a time T greater than a determined threshold Tmax.
- the threshold Tmax is typically between 5 and 15 sec.
- an operating indicator can be determined from a difference E between at least two values of duration D successive or separated by intermediate values.
- Said deviation E can be calculated in different ways.
- the difference E can be given by the algebraic difference between two values of duration D successive or separated by intermediate values.
- the difference E can also be given by an average or statistical difference between at least three values of duration D successive or separated by intermediate values. Operation is typically considered abnormal when said deviation E is greater than a determined threshold Se.
- Said regularization / standardization procedure typically comprises at least one automatic or manual intervention capable of correcting the operation of the drilling device (30).
- Manual intervention typically includes maintenance operations.
- the automatic intervention typically comprises successive tappings (that is to say a series of successive activations and brought together over time of the actuator (31)) or an increase in the pressure of the fluid injected into the actuator ( 31) or an adaptation of the pressure exerted by the actuator (31) to the value of the moment t (and more precisely to the duration of the descent D of the pricker (33)).
- the electrolysis cell (1) comprises at least two piercing devices (30) each associated with a separate powder distributor (20) and the regularization / standardization procedure comprises a interruption, at least temporarily, of the supply by the distributor associated with the piercing device whose operation is deemed abnormal.
- the corresponding supply of pulverulent materials is then advantageously distributed over the other distributor (s) of the cell.
- control method may also comprise a modification of the normal feeding procedure.
- the invention is advantageously implemented using a system (50) for controlling the supply of pulverulent materials comprising: - means (51) for generating an electrical signal S capable of causing, at an instant t 0 determined, the descent of the pricker (33) using the actuator (31), - a device (52) for measuring the moment t at which the pricker (33) reaches a determined low position P, a means (53), called “diagnostic means", for determining the value of at least one operating indicator of the supply F (t 0 , t) from the value of an instant t 0 and of the value obtained for the moment t.
- the measuring device (52) typically comprises at least one position detector (40) capable of detecting said low position P.
- the position detector (40) is advantageously capable of producing a signal SA at the moment t the pricker (33) reaches the determined low position P.
- the device may optionally include, in addition, a converter (48) for generating a specific electrical signal V t from the signal SA-
- the position detector (40) can be integrated into the drilling device (s) (30), in particular to their actuator (s) (31), that is to say that the or each drilling device (30) may include at least one position detector (40) capable of detecting at least said low position.
- an actuator (31) capable of being used to implement the invention advantageously comprises at least one position detector (40) capable of detecting at least said low position P of the rod (32) of the actuator.
- the actuator (31) of the or each drilling device (30) may comprise a jack provided with said position detector (40).
- the detector (40) can be, for example, a limit switch.
- the position detector (s) (40) can (can) be chosen from mechanical, electrical, optical or magnetic detectors and detectors comprising any combination of these means.
- the measuring device (52) may include at least one complementary position detector (40 '), which can (can) be integrated (s) with the drilling device (s) (30).
- a detector (40 ′) capable of detecting a waiting position Po of the rod (32) of the actuator.
- Figures 5 and 6 illustrate actuators (31) capable of being used to implement the invention.
- the actuators (31) are typically connected to a signal converter (41, 41 ') (such as a multimeter), and a signal carrier (45, 45') (such as an electric cable, an electromagnetic wave or an optical beam) intended to transmit by means of diagnostic (53) information on the position of the pricker (33), possibly via a converter (48) capable of generating the signal Vt.
- a signal converter 41, 41 '
- a signal carrier 45, 45'
- the actuator (31) comprises a continuous position detector (40).
- This detector may comprise, for example, a resistor (42), a first friction contact (43) (typically fixed to the body of the actuator (37)), a second friction contact (44) (typically fixed to the rod (32 ) or to the piston (36) of the actuator) and a multimeter (41).
- the actuator (31) comprises two discontinuous position detectors (40, 40 '), capable of detecting specific positions of the rod (32) of the actuator, and therefore of the pricker ( 33).
- each position detector (40, 40 ') may have a separate electromechanical system.
- Each system comprises a rod (46, 46 ') and an opening contact (47, 47') actuated by the passage of the piston (36) at the interior of the rods.
- the diagnostic means (53) can be, for example, a computer or a comparator C. As illustrated in FIG. 3, the means (53) typically uses the signal S A or V t containing the information on the moment t generated by the position detector and the signal V G containing the signal S associated with time t 0 .
- the control system (50) typically comprises a regulator (54), which can be integrated into the general regulation system of the electrolysis cell (1), which is not illustrated.
- the electrical signal generator (51) is normally controlled by the regulator (54).
- the regulator (54) advantageously comprises specific means for implementing automatic interventions intended to correct the operation of a piercing device (30) when an operation indicator F (to, t) reveals an abnormal operation of the food.
- the regulator (54) may have a computer control program automatic interventions (this program can, for example, generate a series of successive activation signals and brought closer in time to the actuator (31), in order to cause successive tappings).
- the regulator (54) may also include means for controlling the fluid pressure injected into the actuator (s) (31) of the drilling device (s) (30), in order to implement an automatic intervention comprising a modification of said pressure.
- the method and system of the invention can be used to detect abnormal operation of an electrolysis cell or a series of electrolysis cells.
- the invention makes it possible to ensure greater reliability of the supply of pulverulent materials to the electrolysis cells.
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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
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI200431845T SI1678350T1 (en) | 2003-10-02 | 2004-09-28 | Method and system for controlling addition of powdery materials to the bath of an electrolysis cell for the production of aluminium |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0311546A FR2860522B1 (en) | 2003-10-02 | 2003-10-02 | METHOD AND SYSTEM FOR CONTROLLING THE ADDITION OF POWDERY MATERIALS IN THE BATH OF AN ELECTROLYSIS CELL INTENDED FOR THE PRODUCTION OF ALUMINUM |
PCT/FR2004/002450 WO2005033369A2 (en) | 2003-10-02 | 2004-09-28 | Method and system for controlling addition of powdery materials to the bath of an electrolysis cell for the production of aluminium |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1678350A2 true EP1678350A2 (en) | 2006-07-12 |
EP1678350B1 EP1678350B1 (en) | 2012-01-18 |
Family
ID=34307354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04787471A Expired - Lifetime EP1678350B1 (en) | 2003-10-02 | 2004-09-28 | Method and system for controlling addition of powdery materials to the bath of an electrolysis cell for the production of aluminium |
Country Status (16)
Country | Link |
---|---|
US (1) | US7504016B2 (en) |
EP (1) | EP1678350B1 (en) |
CN (1) | CN1863942B (en) |
AR (1) | AR045850A1 (en) |
AT (1) | ATE541961T1 (en) |
AU (1) | AU2004278526B2 (en) |
BR (1) | BRPI0414935B1 (en) |
CA (1) | CA2540137C (en) |
FR (1) | FR2860522B1 (en) |
IS (1) | IS8429A (en) |
MY (1) | MY145413A (en) |
NO (1) | NO20061459L (en) |
RU (1) | RU2347014C2 (en) |
SI (1) | SI1678350T1 (en) |
WO (1) | WO2005033369A2 (en) |
ZA (1) | ZA200602791B (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2860522B1 (en) | 2003-10-02 | 2006-01-13 | Pechiney Aluminium | METHOD AND SYSTEM FOR CONTROLLING THE ADDITION OF POWDERY MATERIALS IN THE BATH OF AN ELECTROLYSIS CELL INTENDED FOR THE PRODUCTION OF ALUMINUM |
FR2872176B1 (en) * | 2004-06-25 | 2006-07-28 | Ecl Soc Par Actions Simplifiee | SCRAPER OF A BODY OF A CRUST OF A BATH OF AN ELECTROLYSIS CELL INTENDED FOR THE PRODUCTION OF ALUMINUM |
GB0520497D0 (en) * | 2005-10-08 | 2005-11-16 | Imi Norgren Ltd | Actuator assembly |
AU2007346492B2 (en) * | 2007-02-07 | 2011-08-25 | Festo Ag And Co. Kg | Crust breaker for breaking through a crust formed on a metal molten pool |
CN101265598B (en) * | 2007-03-12 | 2010-08-04 | 中国铝业股份有限公司 | Aluminum electrolysis cell controlling machine voltage swing control method and control system |
EP2080820B1 (en) * | 2008-01-21 | 2010-08-25 | Alcan International Limited | Device and method for short-circuiting one or more cells in an arrangement of electrolysis cells intended for the production of aluminium |
EP2135975A1 (en) * | 2008-06-16 | 2009-12-23 | Alcan International Limited | Method of producing aluminium in an electrolysis cell |
AU2015203272B2 (en) * | 2009-03-26 | 2016-06-30 | Alcoa Usa Corp. | System, method and apparatus for measuring electrolysis cell operating conditions and communicating the same |
US8409409B2 (en) * | 2009-03-26 | 2013-04-02 | Alcoa Inc. | System, method and apparatus for measuring electrolysis cell operating conditions and communicating the same |
CN102965692B (en) * | 2012-11-16 | 2015-04-29 | 中国铝业股份有限公司 | Automatic material blending control device for aluminum electrolytic bath |
CN103488122B (en) * | 2013-09-06 | 2016-01-27 | 天津市永昌焊丝有限公司 | Flux-cored wire medicinal powder discharging control method and control device |
CN105624729B (en) * | 2016-03-09 | 2019-01-22 | 新疆大学 | A kind of anode effect processing unit and method |
CN105755505B (en) * | 2016-03-09 | 2018-11-20 | 新疆大学 | A kind of anode effect quencher |
CN107144320B (en) * | 2017-05-16 | 2020-02-21 | 聊城信源集团有限公司 | Aluminum electrolysis chute charging detection system and working method thereof |
CN108588762B (en) * | 2018-07-02 | 2023-11-21 | 聊城信源集团有限公司 | Electrolytic aluminum crust breaking and blanking system |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
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DE3034104A1 (en) * | 1980-09-09 | 1982-04-01 | Schweizerische Aluminium AG, 3965 Chippis | METHOD AND DEVICE FOR CLEARING AN ANODE EFFECT IN ALUMINUM ELECTROLYSIS |
SU1611992A1 (en) | 1987-09-16 | 1990-12-07 | Предприятие П/Я А-7504 | Method and apparatus for power supply of aluminium electrolyzer |
RU2040593C1 (en) | 1990-04-16 | 1995-07-25 | Акционерное общество открытого типа "Всероссийский алюминиево-магниевый институт" | Method and device for controlling supply of alumina to aluminum electrolyzer |
FI89608C (en) * | 1991-12-12 | 1993-10-25 | Kumera Oy | Plant for supplying raw materials to an electrolysis producing aluminum |
US5378326A (en) * | 1993-06-11 | 1995-01-03 | Kumera Oy | Feeding method and device for aluminum electrolysis |
RU2093611C1 (en) | 1996-03-12 | 1997-10-20 | Акционерное общество открытого типа "Братский алюминиевый завод" | Method of automatically controlling feed of aluminum electrolyzer using silica |
DE29910803U1 (en) * | 1999-06-21 | 1999-09-16 | VAW Aluminium-Technologie GmbH, 53117 Bonn | Circuit arrangement for controlling a crust breaker |
US6436270B1 (en) * | 1999-07-19 | 2002-08-20 | Ab Rexroth Mecman | Method and device for controlling the movement of a feeding and breaking chisel in an aluminum production cell |
SE517901C2 (en) * | 2000-08-15 | 2002-07-30 | Parker Hannifin Ab | Control system for pneumatic drive devices |
FR2860522B1 (en) | 2003-10-02 | 2006-01-13 | Pechiney Aluminium | METHOD AND SYSTEM FOR CONTROLLING THE ADDITION OF POWDERY MATERIALS IN THE BATH OF AN ELECTROLYSIS CELL INTENDED FOR THE PRODUCTION OF ALUMINUM |
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2003
- 2003-10-02 FR FR0311546A patent/FR2860522B1/en not_active Expired - Fee Related
-
2004
- 2004-09-16 MY MYPI20043751A patent/MY145413A/en unknown
- 2004-09-28 EP EP04787471A patent/EP1678350B1/en not_active Expired - Lifetime
- 2004-09-28 RU RU2006114431/02A patent/RU2347014C2/en not_active IP Right Cessation
- 2004-09-28 SI SI200431845T patent/SI1678350T1/en unknown
- 2004-09-28 WO PCT/FR2004/002450 patent/WO2005033369A2/en active Search and Examination
- 2004-09-28 CA CA2540137A patent/CA2540137C/en not_active Expired - Fee Related
- 2004-09-28 AT AT04787471T patent/ATE541961T1/en active
- 2004-09-28 BR BRPI0414935-1A patent/BRPI0414935B1/en not_active IP Right Cessation
- 2004-09-28 US US10/574,522 patent/US7504016B2/en not_active Expired - Fee Related
- 2004-09-28 CN CN2004800287059A patent/CN1863942B/en not_active Expired - Fee Related
- 2004-09-28 AU AU2004278526A patent/AU2004278526B2/en not_active Ceased
- 2004-09-28 ZA ZA200602791A patent/ZA200602791B/en unknown
- 2004-09-29 AR ARP040103535A patent/AR045850A1/en active IP Right Grant
-
2006
- 2006-03-31 NO NO20061459A patent/NO20061459L/en not_active Application Discontinuation
- 2006-04-25 IS IS8429A patent/IS8429A/en unknown
Non-Patent Citations (1)
Title |
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See references of WO2005033369A2 * |
Also Published As
Publication number | Publication date |
---|---|
CN1863942B (en) | 2011-12-28 |
AR045850A1 (en) | 2005-11-16 |
AU2004278526B2 (en) | 2009-10-08 |
CA2540137C (en) | 2012-08-28 |
BRPI0414935A (en) | 2006-11-07 |
ATE541961T1 (en) | 2012-02-15 |
BRPI0414935B1 (en) | 2014-06-17 |
CA2540137A1 (en) | 2005-04-14 |
EP1678350B1 (en) | 2012-01-18 |
IS8429A (en) | 2006-04-25 |
US20070034520A1 (en) | 2007-02-15 |
NO20061459L (en) | 2006-04-27 |
WO2005033369A3 (en) | 2005-12-29 |
WO2005033369A2 (en) | 2005-04-14 |
CN1863942A (en) | 2006-11-15 |
RU2006114431A (en) | 2007-11-20 |
FR2860522A1 (en) | 2005-04-08 |
RU2347014C2 (en) | 2009-02-20 |
ZA200602791B (en) | 2008-08-27 |
SI1678350T1 (en) | 2012-04-30 |
US7504016B2 (en) | 2009-03-17 |
MY145413A (en) | 2012-02-15 |
FR2860522B1 (en) | 2006-01-13 |
AU2004278526A1 (en) | 2005-04-14 |
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