WO2012146060A1 - 阳极效应抑制与熄灭的方法和设备 - Google Patents
阳极效应抑制与熄灭的方法和设备 Download PDFInfo
- Publication number
- WO2012146060A1 WO2012146060A1 PCT/CN2012/000554 CN2012000554W WO2012146060A1 WO 2012146060 A1 WO2012146060 A1 WO 2012146060A1 CN 2012000554 W CN2012000554 W CN 2012000554W WO 2012146060 A1 WO2012146060 A1 WO 2012146060A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- anode
- anode effect
- effect
- suppressing
- extinguishing
- Prior art date
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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
Definitions
- the invention relates to a method and a device for suppressing and extinguishing an anode effect of a prebaked anode electrolytic cell, in particular, after determining a specific area of an anode effect of a prebaked anode aluminum electrolytic cell, how to pass a single point partial blanking The occurrence of the anode effect region is suppressed and the extinguishing method and apparatus after the anode effect occurs.
- the conventional prebaked anode electrolyzer predicts the anode effect of the electrolysis cell based on the signal of the overall cell voltage. After the anode effect is predicted, the method is adopted to suppress all the feed ports simultaneously and increase the amount of feed (for large blanking). The occurrence of the anode effect. However, in fact, the anode effect occurs firstly on individual anodes. All the methods of cutting off the feed opening will change the concentration of alumina in the electrolyte, making it unevenly distributed in space, increasing alumina consumption. In the extreme case, precipitation occurs on the cathode surface of the cell.
- the conventional prebaked anode cell usually adopts an integral elevated pressure bus bar or an artificial effect bar to achieve the extinction of the anode effect.
- the effect of manually inserting the effect bar to extinguish the anode effect is not only delayed in time, but also increases the operator's operating intensity.
- the use of the effect rod becomes larger and larger. If it is not controlled, it will inevitably cause serious damage to the forest. .
- the present invention provides a method for suppressing and extinguishing an anode effect, which aims to suppress the anode by controlling the alumina single-point feeding device after precisely positioning the region where the anode effect is about to occur.
- the effect is to reduce the occurrence of the anode effect and reduce the consumption of alumina. After the anode effect occurs, a targeted local bus bar can be realized to extinguish the anode effect, thereby achieving energy saving.
- the method for suppressing and extinguishing the anode effect of the present invention comprises the following steps: determining an anode which is about to have an anode effect; the electrolytic cell is being discharged by a lower opening corresponding to the anode which is about to have an anode effect; if an anode occurs Effect, according to the anode position where the anode effect occurs, only the local busbar is lifted to extinguish the anode effect.
- the anode for determining the impending anode effect refers to: dividing the anode corresponding to different feed openings, according to the distance between the anode and the discharge port, the decreasing of the electrolyte gradient around the feed port, through different feed openings Corresponding to the anode weighting, when the number of anode effect characteristics of the anode corresponding to different feed openings is greater than the specified ratio, it can be determined that the position of the lower feed port of the aluminum halide blanking is required to suppress the anode effect.
- the anode effect can be extinguished according to the anode position where the anode effect occurs only by pressing up the local bus bar.
- the method includes: dividing the busbars on both sides of the electrolytic cell into at least two partial regions, each of which is controlled by a respective anode lifting mechanism; In the region of the moving pole, if the characteristic of the anode guide rod before the anode effect occurs is 1, the characteristic of the anode guide rod before the occurrence of the anode effect is 0, and the partial regions are summed, and the threshold value of the local moving pole is set. For Q, if the summation of each partial area is greater than that, the corresponding local busbar needs to be lifted.
- the present invention also provides an apparatus for implementing a front anode effect suppression and extinguishing method, characterized in that the apparatus comprises: an anode guiding rod connected to the electrolytic cell for determining an impending anode effect
- the anode voltage signal acquisition processing control system supplements the blanking according to the command issued by the voltage signal acquisition processing control system to suppress the anode lifting mechanism that only raises the local bus bar according to the anode position where the anode effect occurs if the anode effect occurs.
- the targeted addition of alumina can effectively suppress the generation of the anode effect and the anode effect that has already occurred can be extinguished by raising the partial bus.
- the invention can suppress the occurrence of the anode effect by the single point partial blanking of the anode having the anode effect characteristic, and avoid the destruction of the state of the electrolytic tank by the simultaneous feeding of all the feeding openings. It is beneficial to stabilize the operation of the electrolytic cell. At the same time, the effect of energy saving and consumption reduction can be achieved by pressing the local bus bar to extinguish the anode effect.
- Figure f is a schematic view showing the specific distribution of the ⁇ port in the electrolytic cell of the present invention.
- FIG. 2 is a schematic view showing a partial busbar division of the electrolytic cell of the present invention.
- the anode guide rod isometric pressure drop signal is obtained in real time, and then calculated by the data processor according to the anode effect. Characteristics, find the anode that is about to have an anode effect.
- Step 1 Preprocessing of the data.
- the pre-treatment of the anode guide rod isometric data is to pre-process the raw data of the anode guide rod equidistant pressure drop for each anode guide rod of the electrolytic cell, and the processing method adopts the following smoothing formula.
- y i+ 2 —(- y t -2 + — i a 6y t + 4y M + 69y l+2 )
- ⁇ is the smooth value of ⁇
- ⁇ is the original data acquisition value
- the first two points and the last two points of the data The calculations are performed using only the first, second, fourth, and fifth equations in the above formula group.
- Step 2 Low pass filtering.
- Low-pass filtering of the processed anode guide bar equidistant pressure drop data refers to the use of Butterworth bilinear filtering, and the filter frequency upper limit is defaulted to l/600 Hz.
- Step 3 High frequency needle shock treatment.
- Shake ⁇ k) 0.75 * Shake ⁇ k - 1) + 0.25 * Shake ⁇ k) '
- k ⁇ 1,2,3,4,5 ⁇ '> then the intensity of the shock in the current prediction period t is Max ( ⁇ ' w ) ; where is the maximum and minimum values of the equidistant pressure drop of the original anode lead in each equalization period, which is the low-pass filtered anode lead in each equalization period Rod isometric pressure drop.
- Step 4 Slope processing.
- the slope processing of the obtained low-pass filter data respectively refers to the average rate of change of the equidistant pressure drop of the anode guide rod after the low-pass filtering in the period of the prediction period t;
- the t is divided into 5 equal parts, then the slope of the equidistant pressure drop of the anode guide rods in the period ⁇ is calculated as:
- Step 5 Accumulate slope processing.
- the cumulative slope processing of the obtained low-pass filter data is calculated by the following formula:
- Lslope(0) S pe(0) °
- Step 6 The determination of the anode effect is about to occur.
- the data after the high frequency needle shock processing, the slope processing and the cumulative slope processing are subjected to the anode effect discrimination processing to set the threshold for the slope, the cumulative slope and the high frequency needle shock, if the cumulative slope of the anode guide rod isometric continuously continues for several consecutive periods. Decrease, the anode guide rod isometric pressure drop The slope of this period is greatly reduced or the anode guide rod isometric pressure drop high frequency needle vibration is greatly increased, then the anode effect is determined to be about to occur.
- Step 1 First, according to the original design of the electrolytic cell, determine how many discharge ports of the type of electrolytic cell and the specific positions of these discharge ports.
- Steps: A] -A]4 and B1 -B14 in Figure 1 are anodes, which are divided into 4 feed openings, which are A, B, C and D feed openings.
- Step 2 Determine the anode responsible for each feed port according to the distance between each anode and the discharge port.
- A ⁇ A 1 , ⁇ 2, ⁇ 3, ⁇ , ⁇ 1 , ⁇ 2, ⁇ 3, ⁇ 4 ⁇
- Step 3 Since there should be a decrease in the gradient of the alumina concentration around each of the feed openings, the distribution of the alumina concentration in the electrolyte is considered according to the distance between the anode and the discharge port, and the anodes responsible for each feed port are weighted. Corrected.
- Kl, K2, K3 are weights, K1, K2, respectively K3 is 0.9, 0.95, 1, respectively.
- Step 4 In step 3, ⁇ 1 ⁇ 14, ⁇ 1 ⁇ 14 respectively represent whether the corresponding guide has the characteristics before the anode effect occurs. If there is a feature, the corresponding value is 1, otherwise it is 0.
- the four sets of A, ⁇ , C, and D are summed, that is, s wn(A), sum(B), sum(C), and sum(D) are calculated respectively.
- Step 6 If the anode effect cannot be controlled, after the anode effect has occurred, determine how to pressurize the local busbar to extinguish the anode effect according to the following steps.
- FIG 2 shows the local busbar division of one type of electrolytic cell.
- G ⁇ E11, E12, E13, E14, F1 1, F12, F13JF14) is the third partial region.
- Step 1 E1 ⁇ E14, Fb F14 respectively represent whether the corresponding guide has the characteristics before the occurrence of the anode effect. If there is a feature, then ⁇ is ⁇ , otherwise it is 0.
- the three sets of E, F, and G are summed, that is, sum(E), sum(F), and sum(G) are calculated separately.
- Step 3 Wait for the positive effect of the sun plate effect sent by the slot control machine. If the slot control machine confirms that the anode effect has occurred, then lift the local bus bar determined in step 2 to extinguish the anode effect that has occurred.
- the present invention also relates to an apparatus for carrying out the aforementioned anode effect suppressing and extinguishing method.
- the device includes: a voltage signal acquisition and processing control system connected to the anode guide rod of the electrolytic cell for determining an anode effect of an anode effect, and an instruction issued by the voltage signal acquisition processing control system to replace the anode to suppress the anode.
- the shell blanking device corresponding to the anode that is about to have an anode effect, and the anode lift mechanism that only presses the local bus bar according to the anode position where the anode effect occurs if an anode effect occurs.
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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 Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2834498A CA2834498A1 (en) | 2011-04-29 | 2012-04-25 | Method and apparatus for suppressing and extinguishing anode effect |
NO20131575A NO20131575A1 (no) | 2011-04-29 | 2013-11-28 | Fremgangsmåte og anordning for å undertrykke og fjerne anodeeffekt |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201110109898.2A CN102758224B (zh) | 2011-04-29 | 2011-04-29 | 阳极效应抑制与熄灭的方法 |
CN201110109898.2 | 2011-04-29 |
Publications (1)
Publication Number | Publication Date |
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WO2012146060A1 true WO2012146060A1 (zh) | 2012-11-01 |
Family
ID=47052865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2012/000554 WO2012146060A1 (zh) | 2011-04-29 | 2012-04-25 | 阳极效应抑制与熄灭的方法和设备 |
Country Status (4)
Country | Link |
---|---|
CN (1) | CN102758224B (zh) |
CA (1) | CA2834498A1 (zh) |
NO (1) | NO20131575A1 (zh) |
WO (1) | WO2012146060A1 (zh) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105839145A (zh) * | 2016-06-13 | 2016-08-10 | 中南大学 | 一种铝电解槽非均匀下料方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3539461A (en) * | 1967-10-19 | 1970-11-10 | Kaiser Aluminium Chem Corp | Anode effect termination |
SU526683A1 (ru) * | 1974-04-22 | 1976-08-30 | Институт Автоматики | Способ автоматического гашени анодных эффектов на алюминиевых электролизерах |
US4126525A (en) * | 1977-06-22 | 1978-11-21 | Mitsubishi Keikinzoku Kogyo Kabushiki Kaisha | Method of controlling feed of alumina to an aluminum electrolytic cell |
US4654130A (en) * | 1986-05-15 | 1987-03-31 | Reynolds Metals Company | Method for improved alumina control in aluminum electrolytic cells employing point feeders |
CN1040065A (zh) * | 1988-08-04 | 1990-02-28 | 艾尔坎国际有限公司 | 生产铝时终止阳极效应的方法 |
US20070095672A1 (en) * | 2005-11-02 | 2007-05-03 | Shaidulin Eugeniy E | Method of controlling aluminum reduction cell with prebaked anodes |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1170961C (zh) * | 2001-04-20 | 2004-10-13 | 贵阳铝镁设计研究院 | 铝电解生产中自动熄灭阳极效应的方法 |
CN101748445B (zh) * | 2008-12-08 | 2012-10-10 | 贵阳铝镁设计研究院有限公司 | 一种电解槽阳极效应的分区报警方法及报警器 |
CN201634783U (zh) * | 2009-12-17 | 2010-11-17 | 沈阳铝镁设计研究院 | 铝电解槽区域控制系统 |
CN101967658B (zh) * | 2010-11-18 | 2012-08-15 | 北方工业大学 | 铝电解槽阳极效应预测装置 |
-
2011
- 2011-04-29 CN CN201110109898.2A patent/CN102758224B/zh active Active
-
2012
- 2012-04-25 WO PCT/CN2012/000554 patent/WO2012146060A1/zh active Application Filing
- 2012-04-25 CA CA2834498A patent/CA2834498A1/en not_active Abandoned
-
2013
- 2013-11-28 NO NO20131575A patent/NO20131575A1/no not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3539461A (en) * | 1967-10-19 | 1970-11-10 | Kaiser Aluminium Chem Corp | Anode effect termination |
SU526683A1 (ru) * | 1974-04-22 | 1976-08-30 | Институт Автоматики | Способ автоматического гашени анодных эффектов на алюминиевых электролизерах |
US4126525A (en) * | 1977-06-22 | 1978-11-21 | Mitsubishi Keikinzoku Kogyo Kabushiki Kaisha | Method of controlling feed of alumina to an aluminum electrolytic cell |
US4654130A (en) * | 1986-05-15 | 1987-03-31 | Reynolds Metals Company | Method for improved alumina control in aluminum electrolytic cells employing point feeders |
CN1040065A (zh) * | 1988-08-04 | 1990-02-28 | 艾尔坎国际有限公司 | 生产铝时终止阳极效应的方法 |
US20070095672A1 (en) * | 2005-11-02 | 2007-05-03 | Shaidulin Eugeniy E | Method of controlling aluminum reduction cell with prebaked anodes |
Also Published As
Publication number | Publication date |
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CN102758224B (zh) | 2015-02-25 |
NO20131575A1 (no) | 2013-11-28 |
CA2834498A1 (en) | 2012-11-01 |
CN102758224A (zh) | 2012-10-31 |
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