GB1242280A - Improvements in method and apparatus for controlling the production of aluminium - Google Patents
Improvements in method and apparatus for controlling the production of aluminiumInfo
- Publication number
- GB1242280A GB1242280A GB56469/68A GB5646968A GB1242280A GB 1242280 A GB1242280 A GB 1242280A GB 56469/68 A GB56469/68 A GB 56469/68A GB 5646968 A GB5646968 A GB 5646968A GB 1242280 A GB1242280 A GB 1242280A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cell
- resistance
- controller
- unit
- period
- 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.)
- Expired
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
- C25C3/20—Automatic control or regulation of cells
Landscapes
- 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
1,242,280. Producing aluminium by the fused electrolyte process. GENERAL ELECTRIC CO. Nov.28, 1968 [Dec. 7, 1967], No.56469/68. Heading C7B. [Also in Divisions G2 and G3] In a control arrangement for preventing the occurrence of the "anode effect" in a series of aluminium-producing electrolytic reduction cells by maintaining the alumina concentration in the electrolyte within predetermined limits, the resistance of each cell is periodically computed from cell voltage and current measurements to obtain respective "long" and "short" period resistance values corresponding to the average cell resistance during these periods, the values so obtained are compared after each computation and, when the difference between them exceeds a predetermined value (indicative of the onset of the "anode effect"), a predetermined quantity of alumina is automatically added to the electrolyte of the cell, after which the anode position is automatically adjusted (if necessary) to ensure that the resistance of the cell is maintained at a predetermined value. Also, to ensure that the "long" period average resistance value used for comparison with the "short" period resistance value is the lowest so far obtained, the initially computed "long" period value is stored as a base value which is compared with each successive "long" period value and is replaced by lower value (if such occurs) which then becomes the new base value for further comparisons. In one embodiment the cells are controlled by a digital computer with A/D and D/A converters interposed between the measuring and control devices for each cell, these devices comprising the current and voltage sensors, 30, 31, an actuator 36 controlling crust-breaking knives 35, an actuator 39 controlling the supply of alumina to the electrolyte 14 and an actuator 21 controlling the position of the anode 12. Each cell in the line is periodically scanned and controlled (if necessary), the signals from sensors 30, 31 being supplied to a sampling unit 50 which is controlled by a timing unit 51 and calculates the average resistance during a "short" period of thirty seconds from six samples obtained during this period. The output of unit 50 is supplied to an averaging unit 53 which calculates an average resistance during a "long" period of five minutes from ten consecutive outputs of the unit 50. A storage unit 57 and comparator 58 enable the lowest output of the unit 53 to be obtained, stored and applied to a comparator 60 where it is compared with the output of unit 50 after passage of this output through a filter 54. The output of the filter 54 is dependent on the last and previous values of filtered resistance and on the last and previous values of average resistance calculated by the unit 53. When the difference between the signals applied to comparator 60 exceeds a predetermined value (dependent on the characteristics and operating conditions of the cell), an output signal is applied to a sequence controller 65 which actuates in this order a crust break controller 61, an alumina feed controller 67 and an anode-position controller 55. The controller 61 controls and counts the number of times the knives 35 perform their crust-breaking action, the controller 67 controls and registers the (predetermined) amount of alumina fed to the cell and the controller 55 automatically adjusts the anode position (if necessary) in accordance with a resistance signal from the unit 50 and a set-point determined by the operator and dependent on such factors as anode deterioration temperature of the electrolyte and quantity of aluminium in the cell. Anode adjustment maintains the cell resistance within a predetermined "dead band" around the set-point and so maintains the cell temperature within a desired range. Predetermined times are allotted for the operations of controllers 55, 61, 67 and for stabilization of the cell after these operations. The controller 65 then generates a signal to initiate operation of the units 53, 54 and so resume the resistance-monitoring operation previously described. A typical cycle of operations is described Fig. 3 (not shown) and the mathematical functions of the units 50, 53, 54 are discussed. In another embodiment, Fig.4 (not shown) analogue components are used and the operation is generally similar to that previously described, except that after the crust break and alumina adding operation a check is made on the resistance of the cell (using the "short" period value) and further operations and checks are performed as necessary. The analogue components include a magnetic amplifier, millivolt/current converters, RC filter units, a PI controller and relays, the latter serving among other purposes to provide standard resistance values and to ensure equilibrium of the PI controller at the beginning of a resistance monitoring operation.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US68881067A | 1967-12-07 | 1967-12-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1242280A true GB1242280A (en) | 1971-08-11 |
Family
ID=24765877
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB56469/68A Expired GB1242280A (en) | 1967-12-07 | 1968-11-28 | Improvements in method and apparatus for controlling the production of aluminium |
Country Status (5)
Country | Link |
---|---|
US (1) | US3660256A (en) |
DE (1) | DE1812138A1 (en) |
FR (1) | FR1596816A (en) |
GB (1) | GB1242280A (en) |
NL (1) | NL6817486A (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH587357A5 (en) * | 1973-08-09 | 1977-04-29 | Alusuisse | |
FR2487386A1 (en) * | 1980-07-23 | 1982-01-29 | Pechiney Aluminium | METHOD AND APPARATUS FOR PRECISELY REGULATING THE INTRODUCTION RATE AND THE ALUMINUM CONTENT OF AN IGNATED ELECTROLYSIS TANK, AND APPLICATION TO THE PRODUCTION OF ALUMINUM |
NZ232580A (en) * | 1989-02-24 | 1992-12-23 | Comalco Alu | Aluminium smelting process control |
FR2727985B1 (en) * | 1994-12-09 | 1997-01-24 | Pechiney Aluminium | METHOD AND DEVICE FOR MEASURING THE TEMPERATURE AND LEVEL OF THE MELT ELECTROLYSIS BATH IN ALUMINUM PRODUCTION TANKS |
NO311623B1 (en) * | 1998-03-23 | 2001-12-17 | Norsk Hydro As | Process for controlling aluminum oxide supply to electrolysis cells for aluminum production |
SE517901C2 (en) * | 2000-08-15 | 2002-07-30 | Parker Hannifin Ab | Control system for pneumatic drive devices |
CA2671066C (en) * | 2006-12-19 | 2016-07-26 | Michael Schneller | Aluminum production process control |
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 |
US8199023B2 (en) * | 2008-10-15 | 2012-06-12 | Alcoa Inc. | Systems, methods and apparatus for tapping a metal electrolysis cell |
US8932515B2 (en) | 2011-06-13 | 2015-01-13 | La-Z-Boy Incorporated | Crust breaker aluminum bath detection system |
US8906291B2 (en) | 2011-06-13 | 2014-12-09 | Mac Valves, Inc. | Piston rod and cylinder seal device for aluminum bath crust breaker |
US8753564B2 (en) | 2011-06-13 | 2014-06-17 | Mac Valves, Inc. | Piston rod and cylinder seal device for aluminum bath crust breaker |
US8910562B2 (en) | 2011-06-13 | 2014-12-16 | Mac Valves, Inc. | Pneumatic system for controlling aluminum bath crust breaker |
CN108360021B (en) * | 2018-04-10 | 2020-03-06 | 中南大学 | Method and equipment for acquiring process control parameters of aluminum electrolysis cell based on data and knowledge |
CN110129831B (en) * | 2019-06-19 | 2024-07-02 | 沈阳鑫博工业技术股份有限公司 | Multi-parameter online measurement device and measurement method for aluminum electrolysis cell process |
CN110501561A (en) * | 2019-09-27 | 2019-11-26 | 贵阳铝镁设计研究院有限公司 | Aluminum cell anodic current is distributed on-line detecting system and its method |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH417125A (en) * | 1963-08-30 | 1966-07-15 | Alusuisse | Process for the automatic regulation of the terminal voltage in a system for the electrolytic production of aluminum in the fluoride melt flow and a system provided with the corresponding regulating device |
FR1397946A (en) * | 1964-01-14 | 1965-05-07 | Pechiney | Process for the prediction of burns, the systematic feeding and automatic regulation of the anode system of the tanks for the igneous electrolysis of alumina |
US3471390A (en) * | 1965-03-24 | 1969-10-07 | Reynolds Metals Co | Alumina concentration meter |
NL130687C (en) * | 1965-05-28 | |||
US3573179A (en) * | 1965-12-14 | 1971-03-30 | Ibm | Method and apparatus for the control of electrolytic refining cells |
-
1967
- 1967-12-07 US US688810A patent/US3660256A/en not_active Expired - Lifetime
-
1968
- 1968-11-28 GB GB56469/68A patent/GB1242280A/en not_active Expired
- 1968-12-02 DE DE19681812138 patent/DE1812138A1/en active Pending
- 1968-12-05 NL NL6817486A patent/NL6817486A/xx unknown
- 1968-12-06 FR FR1596816D patent/FR1596816A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US3660256A (en) | 1972-05-02 |
NL6817486A (en) | 1969-06-10 |
FR1596816A (en) | 1970-06-22 |
DE1812138A1 (en) | 1969-07-03 |
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