CA2834498A1 - Method and apparatus for suppressing and extinguishing anode effect - Google Patents
Method and apparatus for suppressing and extinguishing anode effect Download PDFInfo
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- 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
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Abstract
A method for suppressing and extinguishing an anode effect of a pre-baked anode electrolyzer and an equipment for implementing the method are provided. The method includes the following steps: determining the anode to be occurring an anode effect; feeding through the feed opening corresponding to the anode to be occurring the anode effect of the electrolyzer; if the anode effect occurs, only raising and pressing the local bus according to the anode position where the anode effect occurs to extinguish the anode effect. By merely supplying alumina locally, it can effectively inhibit the generation of the anode effect, as well as by raising and pressing of the local bus, it can extinguish the anode effect. By feeding locally through a single feeding point into the anode which appears a feature of anode effect to inhibit the generation of the anode effect, it can avoid destroying the state of the electrolyzer when feeding through all of the feed openings at the same time, and is beneficial to the stability of electrolyzer operation. At the same time, by raising and pressing of the local bus to extinguish the anode effect, it can achieve the effects of energy saving and consumption reduction.
Description
METHOD AND APPARATUS FOR SUPPRESSING AND EXTINGUISHING
ANODE EFFECT
Field of the Invention The present invention relates to a method and apparatus for suppressing and extinguishing an anode effect of a prebaked anode electrolytic cell, and particularly to a method and apparatus for suppressing a specific area of the prebaked anode aluminum electrolytic cell where the anode effect is about to occur by feeding locally through a single point after the specific area is determined, and for extinguishing the anode effect after it occurs.
Background of the Invention A conventional prebaked anode electrolytic cell predicts situations of the electrolytic cell anode effect according to a signal indicative of the whole cell voltage.
After successful prediction of the anode effect, the occurrence of the anode effect is suppressed by a method of increasing feeding amount (performing large-amount feeding) through all feeding ports simultaneously. However, in fact the anode effect usually first occurs on individual anodes, so the method of feeding through all feeding ports will change concentration of alumina in the electrolyte so that alumina is not distributed evenly in space, consumption of alumina is increased and, under extreme conditions, deposit will occur on a surface of a cathode of the electrolytic cell.
When the anode effect occurs in the conventional prebaked anode electrolytic cell, it is extinguished usually by raising and pressing a bus wholly or manually inserting an effect rod. Extinguishing the anode effect by manually inserting the effect rod lags in time and increases workers' operation intensity. Furthermore, more and more effect rods are used as aluminum productivity increases, so serious destruction will be necessarily caused to forest in absence of any control. Extinguishing the anode effect by raising and pressing the bus wholly not only causes waste of energy due to lack of purposefulness, but also might cause thermal balance of the electrolytic cell to be often destroyed along with adjustment of the whole pole distance.
As the electrolytic cell size constantly increases in recent years, this conventional method of aimless suppressing and extinguishing the anode effect has already failed to CA 02834498 2013-10-28, meet requirements for precise operations of new types of electrolytic cells, and failed to accord with the target of reducing energy consumption during aluminum electrolysis in the society. A new anode effect suppressing and extinguishing method is very important for further improving technical and economic indices of the electrolytic cell.
Summary of the Invention In order to address the above technical problems, the present invention provides a method for suppressing and extinguishing an anode effect, aiming to suppress the anode effect, reduce occurrence of the anode effect and decrease consumption of alumina by performing purposeful feeding by controlling an alumina single-point feeding means after a region where the anode effect is about to occur can be positioned precisely, and aiming to raise and press the local bus purposefully to extinguish the anode effect and thereby save energy after the anode effect has occurred.
To achieve the above purpose, the method for suppressing and extinguishing the anode effect according to the present invention comprises the following steps:
determining an anode where the anode effect is about to occur; allowing the electrolytic cell to feed through a feeding port corresponding to the anode where the anode effect is about to occur; if the anode effect occurs, only raising and pressing local bus according to the anode position where the anode effect occurs to extinguish the anode effect.
Determining an anode where the anode effect is about to occur refers to:
dividing anodes corresponding to different feeding ports, weighting the anodes corresponding to different feeding ports according to distances between the anodes and the feeding ports and according to progressive decrease of an electrolyte gradient around the feeding ports, and determining a position of the feeding port for feeding alumina to suppress occurrence of the anode effect after the number of features of anode effect at the anodes corresponding to different feeding ports is greater than a predetermined proportion.
A value of features of the anode effect occurring at the anode is 1, and a value of features of anode effect not occurring at the anode is 0. Values of features of anode effect at respective feeding ports are summated; assume a feeding port judgment threshold be P, 0<P<=1. Judgment is performed as to comparison between a result of the sum of values of anode features corresponding to respective feeding ports dividing the number of anodes corresponding to the respective feeding ports and the P.
If the result of the sum of values of anode features corresponding to respective feeding ports dividing the number of anodes corresponding to the respective feeding ports is greater than the P, the feeding ports need to feed alumina and the feeding amount is a minimum which can suppress occurrence of the anode effect.
Only raising and pressing local bus according to the anode position where the anode effect occurs to extinguish the anode effect comprises: dividing the bus on both sides of the electrolytic cell into at least two regions, and controlling each of the regions by an anode lifting mechanism; determining a region needing local acting electrode;
summating respective regions if the value of features possessed by the anode guide rod before occurrence of the anode effect is 1, and the value of features not possessed by the anode guide rod before occurrence of the anode effect is 0; assume local acting electrode judgment threshold is Q, if the sum of the respective regions is greater than Q, the corresponding local bus needs to be raised and pressed.
To achieve the above purpose, the present invention further provides an apparatus for suppressing and extinguishing the anode effect as described above, characterized in that the apparatus comprises: a voltage signal collecting processing and controlling system connected to the electrolytic cell anode guide rod and configured to determine an anode where the anode effect is about to occur, a crust-breaking and feeding means configured to perform supplementary feeding according to instructions sent by the voltage signal collecting processing and controlling system to suppress the occurrence of the anode effect and configured to correspond to the anode where the anode effect is about to occur, and an anode lifting mechanism configured to only raise and press local bus according to the position of the anode where the anode effect occurs if the anode effect occurs.
The present invention is advantageous in the following: by purposefully supplementing alumina locally, it can effectively inhibit occurrence of the anode effect, and by raising and pressing of the local bus, it can extinguish the anode effect that has already occurred; the invention can suppress occurrence of the anode effect by feeding locally through a single point for the anode where anode effect features occur, avoid the destroy of the electrolytic cell state caused by feeding through all feeding ports simultaneously, facilitate stable operation of the electrolytic cell, and meanwhile, extinguish the anode effect by raising and pressing the local bus to achieve an -3..
energy-saving effect. =
Brief Description of the Drawings Fig.1 is a schematic view showing specific distribution of feeding ports of an electrolytic cell according to the present invention.
Fig.2 is a schematic view showing division of local bus of the electrolytic cell according to the present invention.
Detailed Description of the Preferred Embodiments 1. First of all, a voltage signal collecting device mounted on an anode guide rod (not shown) of the electrolytic cell is employed to acquire an isometric pressure drop signal of the anode guide rod, and then an anode where the anode effect is about to occur will be found by means of operations of a data processor and according to pre-occurrence features of the anode effect.
The specific method is as follows:
Step 1.. Data pre-processing. Pre-processing the isometric pressure drop data of the anode guide means pre-processing isometric pressure drop original data of the anode rod which is sectioned with a time duration t; the pre-processing method employs the following smoothing formula to remove abnormal voltage fluctuation from the signal:
-(69yi 2 + 6.Y1+ 4.Yi.1-311+2) = 2 + 27y,1 +12y, ¨ 8y1õ + 2y,+2) = 1 +12y,1 +17y1 +12y1õ ¨3y,+2) = ¨1(2y, ¨8y +12y1 + 27y,õ +2y1+2) 1 ( A+2 yi-2 4y1 - +4.YHA +69Y1+2.) Wherein i is a smoothed value of yõ y, is original data collection value, wherein the first two points and last two points of the data are respectively calculated only by using the first and second, and the fourth and fifth formulas among the above formula set.
25 Step 2: low-pass filter processing.
Performing low-pass filtering for the pre-processed isometric pressure drop data of the anode guide rod refers to employing Butterworth bilinear filtering, with a default valve of an upper limit of the filtering frequency being 1/600Hz.
Step 3: high-frequency voltage fluctuation processing. Subjecting the resultant low-pass filter data respectively to high-frequency voltage fluctuation processing refers to calculating according to the following formula an isometric pressure drop voltage fluctuation intensity of the anode guide rod in each period t by dividing the time duration t into five equal parts: Shake(k) = I/max Vinin ¨ VF(k)¨VF(k ¨1)!; then performing smoothing processing for voltage fluctuation intensity in each time period according to the formula Shake' (k) = 0.75 * Shake(k ¨1) + 0.25 * Shake(k) , wherein k =
{1,2,3,4,5} ;
then the voltage fluctuation intensity in the current prediction period t is max(Shake' (k)) , = wherein Võ,a,, and 17n,i,, are a maximum and a minimum of the anode guide rod original isometric pressure drop in each equally-divided time period, VF is the anode guide rod isometric pressure drop after having been subjected to low-pass filtering in each equally-divided time period.
Step 4: gradient processing.
Subjecting the obtained low-pass filter data respectively to gradient processing means that the anode guide rod isometric pressure drop gradient is an average change rate of the anode guide rod isometric pressure drop after the low-pass filtering within a prediction time period t; likewise, the time duration t is divided into five equal parts, and then a formula for calculating the gradient of the anode guide rod isometric pressure drop in the cycle t is as follows:
Slope(t) = (VF(k ¨1)¨ VF(k ¨3) + 2(VF(k) ¨ VF(k ¨ 4))) / 5.
Step 5: accumulative gradient processing. Subjecting the obtained low-pass filter data to accumulative gradient processing refers to performing calculation through the following formula:
Lslope(t) = (718)* Lslope(t ¨1) + 2* Slope(t) I 3 = Lslope(0) = Slope(0) .
Step 6: judging that anode effect which is about to occur. Subjecting data after high-frequency voltage fluctuation processing, gradient processing and accumulative processing to anode effect judgment processing refers to setting a threshold for the gradient, the accumulative gradient and high-frequency voltage fluctuation. If the anode guide rod isometric pressure drop accumulative gradient constantly falls in continuous CA 02834498 2013-10-28, several cycles, the gradient of the anode guide rod isometric pressure drop in this cycle substantially falls, or high-frequency voltage fluctuation of the anode guide rod isometric pressure drop substantially increases, it is judged that anode effect is about to occur.
II. The feeding port for performing supplementary feeding to suppress occurrence of the anode effect is determined according to the following method.
The method is as follows:
Step 1 involves determining the number of feeding ports of this type of electrolytic cell and specific positions of these feeding ports according to original design of the electrolytic cell.
Fig.1 is taken as an example to illustrate as below.
At Step 1, Al-A14 and BI-B14 in Fig.1 are anodes, and there are totally four feeding ports, namely, feeding ports A, B, C and D.
Step 2 involves determining anodes that respective feeding ports are responsible for according to distances between respective anodes and feeding ports, and dividing to produce sets, namely determining which feeding port needs to be used to feed material to suppress the anode effect if an individual guide rod has features of anode effect. The anodes which respective feeding ports are responsible for are divided as follows by taking into account positional relationship between feeding ports and respective anodes:
A={A1,A2,A3,A4,B1,B2,B3,B4}
B={A4,A5,A6,A7,A8,B4,B5,B6,B7,B8}
C={A7,A8,A9,A10,A1 I ,B7,B8,B9,B10,B11}
D={Al 1,Al2,A13,A14,B11,B12,B13,B14}, At Step 3, since alumina concentration around respective feeding ports should gradiently decrease progressively, the anodes which the feeding ports are responsible for are subjected to weighting correction by considering distribution of alumina concentration in the electrolyte according to the distances between the anodes and feeding ports.
Situations are as follows:
A¨ {K I *A1,K2*A2,K2*A3,K1*A4,K1*B1,K2*B2,1(2*B3,K1*B4 B={K1*A4,K2*A5,K3*A6,K2*A7,K1*A8,K1*B4,K2*B5,K3*B6,K2*B7,K1*B8 }
C={K 1 *A7,K2*A8,K3*A9,K2*A10,K1*A11,K1*B7,K2*B8,K3*B9,K2*B10,K1*B
11}
ANODE EFFECT
Field of the Invention The present invention relates to a method and apparatus for suppressing and extinguishing an anode effect of a prebaked anode electrolytic cell, and particularly to a method and apparatus for suppressing a specific area of the prebaked anode aluminum electrolytic cell where the anode effect is about to occur by feeding locally through a single point after the specific area is determined, and for extinguishing the anode effect after it occurs.
Background of the Invention A conventional prebaked anode electrolytic cell predicts situations of the electrolytic cell anode effect according to a signal indicative of the whole cell voltage.
After successful prediction of the anode effect, the occurrence of the anode effect is suppressed by a method of increasing feeding amount (performing large-amount feeding) through all feeding ports simultaneously. However, in fact the anode effect usually first occurs on individual anodes, so the method of feeding through all feeding ports will change concentration of alumina in the electrolyte so that alumina is not distributed evenly in space, consumption of alumina is increased and, under extreme conditions, deposit will occur on a surface of a cathode of the electrolytic cell.
When the anode effect occurs in the conventional prebaked anode electrolytic cell, it is extinguished usually by raising and pressing a bus wholly or manually inserting an effect rod. Extinguishing the anode effect by manually inserting the effect rod lags in time and increases workers' operation intensity. Furthermore, more and more effect rods are used as aluminum productivity increases, so serious destruction will be necessarily caused to forest in absence of any control. Extinguishing the anode effect by raising and pressing the bus wholly not only causes waste of energy due to lack of purposefulness, but also might cause thermal balance of the electrolytic cell to be often destroyed along with adjustment of the whole pole distance.
As the electrolytic cell size constantly increases in recent years, this conventional method of aimless suppressing and extinguishing the anode effect has already failed to CA 02834498 2013-10-28, meet requirements for precise operations of new types of electrolytic cells, and failed to accord with the target of reducing energy consumption during aluminum electrolysis in the society. A new anode effect suppressing and extinguishing method is very important for further improving technical and economic indices of the electrolytic cell.
Summary of the Invention In order to address the above technical problems, the present invention provides a method for suppressing and extinguishing an anode effect, aiming to suppress the anode effect, reduce occurrence of the anode effect and decrease consumption of alumina by performing purposeful feeding by controlling an alumina single-point feeding means after a region where the anode effect is about to occur can be positioned precisely, and aiming to raise and press the local bus purposefully to extinguish the anode effect and thereby save energy after the anode effect has occurred.
To achieve the above purpose, the method for suppressing and extinguishing the anode effect according to the present invention comprises the following steps:
determining an anode where the anode effect is about to occur; allowing the electrolytic cell to feed through a feeding port corresponding to the anode where the anode effect is about to occur; if the anode effect occurs, only raising and pressing local bus according to the anode position where the anode effect occurs to extinguish the anode effect.
Determining an anode where the anode effect is about to occur refers to:
dividing anodes corresponding to different feeding ports, weighting the anodes corresponding to different feeding ports according to distances between the anodes and the feeding ports and according to progressive decrease of an electrolyte gradient around the feeding ports, and determining a position of the feeding port for feeding alumina to suppress occurrence of the anode effect after the number of features of anode effect at the anodes corresponding to different feeding ports is greater than a predetermined proportion.
A value of features of the anode effect occurring at the anode is 1, and a value of features of anode effect not occurring at the anode is 0. Values of features of anode effect at respective feeding ports are summated; assume a feeding port judgment threshold be P, 0<P<=1. Judgment is performed as to comparison between a result of the sum of values of anode features corresponding to respective feeding ports dividing the number of anodes corresponding to the respective feeding ports and the P.
If the result of the sum of values of anode features corresponding to respective feeding ports dividing the number of anodes corresponding to the respective feeding ports is greater than the P, the feeding ports need to feed alumina and the feeding amount is a minimum which can suppress occurrence of the anode effect.
Only raising and pressing local bus according to the anode position where the anode effect occurs to extinguish the anode effect comprises: dividing the bus on both sides of the electrolytic cell into at least two regions, and controlling each of the regions by an anode lifting mechanism; determining a region needing local acting electrode;
summating respective regions if the value of features possessed by the anode guide rod before occurrence of the anode effect is 1, and the value of features not possessed by the anode guide rod before occurrence of the anode effect is 0; assume local acting electrode judgment threshold is Q, if the sum of the respective regions is greater than Q, the corresponding local bus needs to be raised and pressed.
To achieve the above purpose, the present invention further provides an apparatus for suppressing and extinguishing the anode effect as described above, characterized in that the apparatus comprises: a voltage signal collecting processing and controlling system connected to the electrolytic cell anode guide rod and configured to determine an anode where the anode effect is about to occur, a crust-breaking and feeding means configured to perform supplementary feeding according to instructions sent by the voltage signal collecting processing and controlling system to suppress the occurrence of the anode effect and configured to correspond to the anode where the anode effect is about to occur, and an anode lifting mechanism configured to only raise and press local bus according to the position of the anode where the anode effect occurs if the anode effect occurs.
The present invention is advantageous in the following: by purposefully supplementing alumina locally, it can effectively inhibit occurrence of the anode effect, and by raising and pressing of the local bus, it can extinguish the anode effect that has already occurred; the invention can suppress occurrence of the anode effect by feeding locally through a single point for the anode where anode effect features occur, avoid the destroy of the electrolytic cell state caused by feeding through all feeding ports simultaneously, facilitate stable operation of the electrolytic cell, and meanwhile, extinguish the anode effect by raising and pressing the local bus to achieve an -3..
energy-saving effect. =
Brief Description of the Drawings Fig.1 is a schematic view showing specific distribution of feeding ports of an electrolytic cell according to the present invention.
Fig.2 is a schematic view showing division of local bus of the electrolytic cell according to the present invention.
Detailed Description of the Preferred Embodiments 1. First of all, a voltage signal collecting device mounted on an anode guide rod (not shown) of the electrolytic cell is employed to acquire an isometric pressure drop signal of the anode guide rod, and then an anode where the anode effect is about to occur will be found by means of operations of a data processor and according to pre-occurrence features of the anode effect.
The specific method is as follows:
Step 1.. Data pre-processing. Pre-processing the isometric pressure drop data of the anode guide means pre-processing isometric pressure drop original data of the anode rod which is sectioned with a time duration t; the pre-processing method employs the following smoothing formula to remove abnormal voltage fluctuation from the signal:
-(69yi 2 + 6.Y1+ 4.Yi.1-311+2) = 2 + 27y,1 +12y, ¨ 8y1õ + 2y,+2) = 1 +12y,1 +17y1 +12y1õ ¨3y,+2) = ¨1(2y, ¨8y +12y1 + 27y,õ +2y1+2) 1 ( A+2 yi-2 4y1 - +4.YHA +69Y1+2.) Wherein i is a smoothed value of yõ y, is original data collection value, wherein the first two points and last two points of the data are respectively calculated only by using the first and second, and the fourth and fifth formulas among the above formula set.
25 Step 2: low-pass filter processing.
Performing low-pass filtering for the pre-processed isometric pressure drop data of the anode guide rod refers to employing Butterworth bilinear filtering, with a default valve of an upper limit of the filtering frequency being 1/600Hz.
Step 3: high-frequency voltage fluctuation processing. Subjecting the resultant low-pass filter data respectively to high-frequency voltage fluctuation processing refers to calculating according to the following formula an isometric pressure drop voltage fluctuation intensity of the anode guide rod in each period t by dividing the time duration t into five equal parts: Shake(k) = I/max Vinin ¨ VF(k)¨VF(k ¨1)!; then performing smoothing processing for voltage fluctuation intensity in each time period according to the formula Shake' (k) = 0.75 * Shake(k ¨1) + 0.25 * Shake(k) , wherein k =
{1,2,3,4,5} ;
then the voltage fluctuation intensity in the current prediction period t is max(Shake' (k)) , = wherein Võ,a,, and 17n,i,, are a maximum and a minimum of the anode guide rod original isometric pressure drop in each equally-divided time period, VF is the anode guide rod isometric pressure drop after having been subjected to low-pass filtering in each equally-divided time period.
Step 4: gradient processing.
Subjecting the obtained low-pass filter data respectively to gradient processing means that the anode guide rod isometric pressure drop gradient is an average change rate of the anode guide rod isometric pressure drop after the low-pass filtering within a prediction time period t; likewise, the time duration t is divided into five equal parts, and then a formula for calculating the gradient of the anode guide rod isometric pressure drop in the cycle t is as follows:
Slope(t) = (VF(k ¨1)¨ VF(k ¨3) + 2(VF(k) ¨ VF(k ¨ 4))) / 5.
Step 5: accumulative gradient processing. Subjecting the obtained low-pass filter data to accumulative gradient processing refers to performing calculation through the following formula:
Lslope(t) = (718)* Lslope(t ¨1) + 2* Slope(t) I 3 = Lslope(0) = Slope(0) .
Step 6: judging that anode effect which is about to occur. Subjecting data after high-frequency voltage fluctuation processing, gradient processing and accumulative processing to anode effect judgment processing refers to setting a threshold for the gradient, the accumulative gradient and high-frequency voltage fluctuation. If the anode guide rod isometric pressure drop accumulative gradient constantly falls in continuous CA 02834498 2013-10-28, several cycles, the gradient of the anode guide rod isometric pressure drop in this cycle substantially falls, or high-frequency voltage fluctuation of the anode guide rod isometric pressure drop substantially increases, it is judged that anode effect is about to occur.
II. The feeding port for performing supplementary feeding to suppress occurrence of the anode effect is determined according to the following method.
The method is as follows:
Step 1 involves determining the number of feeding ports of this type of electrolytic cell and specific positions of these feeding ports according to original design of the electrolytic cell.
Fig.1 is taken as an example to illustrate as below.
At Step 1, Al-A14 and BI-B14 in Fig.1 are anodes, and there are totally four feeding ports, namely, feeding ports A, B, C and D.
Step 2 involves determining anodes that respective feeding ports are responsible for according to distances between respective anodes and feeding ports, and dividing to produce sets, namely determining which feeding port needs to be used to feed material to suppress the anode effect if an individual guide rod has features of anode effect. The anodes which respective feeding ports are responsible for are divided as follows by taking into account positional relationship between feeding ports and respective anodes:
A={A1,A2,A3,A4,B1,B2,B3,B4}
B={A4,A5,A6,A7,A8,B4,B5,B6,B7,B8}
C={A7,A8,A9,A10,A1 I ,B7,B8,B9,B10,B11}
D={Al 1,Al2,A13,A14,B11,B12,B13,B14}, At Step 3, since alumina concentration around respective feeding ports should gradiently decrease progressively, the anodes which the feeding ports are responsible for are subjected to weighting correction by considering distribution of alumina concentration in the electrolyte according to the distances between the anodes and feeding ports.
Situations are as follows:
A¨ {K I *A1,K2*A2,K2*A3,K1*A4,K1*B1,K2*B2,1(2*B3,K1*B4 B={K1*A4,K2*A5,K3*A6,K2*A7,K1*A8,K1*B4,K2*B5,K3*B6,K2*B7,K1*B8 }
C={K 1 *A7,K2*A8,K3*A9,K2*A10,K1*A11,K1*B7,K2*B8,K3*B9,K2*B10,K1*B
11}
D¨{K1*A11,K2*Al2,K2*A13,K1*A14,K1*B11 ,K2*B12,K2*B13,1(1*B14) =
wherein K I, K2, and K3 are weight respectively, and Kl, K2 and K3 take 0.9, 0.95 and 1 respectively.
At step 4, A1-A14 and BI-B14 in step 3 respectively represent whether a corresponding guide rod has features before occurrence of the anode effect. If there are the features, 1 is taken as the value correspondingly, otherwise 0 is taken as the value.
Four sets A, B, C and D are summated, i.e., sum(A), sum(B), sum(C) and sum(D) are calculated respectively.
At step 5, assume a feeding port judgment threshold be P, 0<P<=1. Judgment is carried out as to whether the following stands are not: sum(A)/M1>P, sum(B)/M2>P, sum(C)/M2>P, and sum(D)/M1>P, wherein M1-8 and M2-10, that is, the number of anodes which different feeding ports are responsible for, and electrolytic cells with different structures are also processed according to this method. If the above stands, alumina needs to be feed through the feeding port, and the feeding amount is a minimum which can suppress occurrence of the anode effect.
At step 6, if occurrence of the anode effect cannot be suppressed, the following steps are taken to determine how to raise and press the local bus to extinguish the anode effect if the anode effect has already occurred.
Fig.2 illustrates division of local bus of a type of electrolytic cell. Bus on original both sides of the electrolytic cell is divided into three regions E, F and G, wherein E¨{E I ,E2,E3,E4,F1,F2,F3,F4 } is the first region, E5,E6,E7,E8,E9,E10,F5,F6,F7,F8,F9,F10} is the second region, and G¨{Ell,E12,E13,E14,F11,F12,F13,F14} is the third region.
The three portions are respectively controlled by respective anode lifting mechanisms (not shown) so that the three regions can be lifted and lowered individually.
Different division may be performed for different types of electrolytic cells according to situations. For example, those skilled in the art can appreciate that the bus on original both sides of the electrolytic cell may be divided into more than two regions according to different needs.
A region which needs local acting electrode is determined according to the following method:
At step 1, E1-E14 and F1-F14 respectively represent whether a corresponding guide CA 02834498 2013-10-28, rod has features before occurrence of the anode effect. If there are the features, 1 is taken as the value correspondingly, otherwise 0 is taken as the value. Three sets E, F and G
are summated, i.e., sum(E), sum(F), and sum(G) are calculated respectively.
At step 2, suppose local acting electrode judgment threshold is Q, generally Q=0.
Judgment is carried out as to whether the following stands are not: sum(E) >Q, sum(F) >Q and sum(G) >Q, namely judging whether, among different local bus divisions, there are anodes having features indicating that the anode effect is about to occur.
If the above stands, the corresponding local bus needs to be raised and pressed.
Step 3 involves waiting for a mark of occurrence of the anode effect sent by a cell control machine. If the cell control machine confirms that the anode effect has already occurred, the local bus as determined in step 2 is raised and pressed to extinguish the anode effect that has already occurred.
The present invention relates to an apparatus for suppressing and extinguishing the anode effect as described above. The apparatus comprises: a voltage signal collecting processing and controlling system connected to the electrolytic cell anode guide rod and configured to determine an anode where the anode effect is about to occur, a crust-breaking and feeding means configured to perform supplementary feeding according to instructions sent by the voltage signal collecting processing and controlling system to suppress the occurrence of the anode effect and configured to correspond to the anode where the anode effect is about to occur, and an anode lifting mechanism configured to only raise and press local bus according to the position of the anode where the anode effect occurs if the anode effect occurs.
Embodiments of the present invention have already been illustrated in the drawings and description. Although technical terms are employed, these technical terms are only used in their broad sense and not intended to limit the present invention.
Changes and equivalent substitutes of the foregoing may be devised according to situations or expedient purposes without departing from the spirit and scope of the present invention as defined by the appended claims.
wherein K I, K2, and K3 are weight respectively, and Kl, K2 and K3 take 0.9, 0.95 and 1 respectively.
At step 4, A1-A14 and BI-B14 in step 3 respectively represent whether a corresponding guide rod has features before occurrence of the anode effect. If there are the features, 1 is taken as the value correspondingly, otherwise 0 is taken as the value.
Four sets A, B, C and D are summated, i.e., sum(A), sum(B), sum(C) and sum(D) are calculated respectively.
At step 5, assume a feeding port judgment threshold be P, 0<P<=1. Judgment is carried out as to whether the following stands are not: sum(A)/M1>P, sum(B)/M2>P, sum(C)/M2>P, and sum(D)/M1>P, wherein M1-8 and M2-10, that is, the number of anodes which different feeding ports are responsible for, and electrolytic cells with different structures are also processed according to this method. If the above stands, alumina needs to be feed through the feeding port, and the feeding amount is a minimum which can suppress occurrence of the anode effect.
At step 6, if occurrence of the anode effect cannot be suppressed, the following steps are taken to determine how to raise and press the local bus to extinguish the anode effect if the anode effect has already occurred.
Fig.2 illustrates division of local bus of a type of electrolytic cell. Bus on original both sides of the electrolytic cell is divided into three regions E, F and G, wherein E¨{E I ,E2,E3,E4,F1,F2,F3,F4 } is the first region, E5,E6,E7,E8,E9,E10,F5,F6,F7,F8,F9,F10} is the second region, and G¨{Ell,E12,E13,E14,F11,F12,F13,F14} is the third region.
The three portions are respectively controlled by respective anode lifting mechanisms (not shown) so that the three regions can be lifted and lowered individually.
Different division may be performed for different types of electrolytic cells according to situations. For example, those skilled in the art can appreciate that the bus on original both sides of the electrolytic cell may be divided into more than two regions according to different needs.
A region which needs local acting electrode is determined according to the following method:
At step 1, E1-E14 and F1-F14 respectively represent whether a corresponding guide CA 02834498 2013-10-28, rod has features before occurrence of the anode effect. If there are the features, 1 is taken as the value correspondingly, otherwise 0 is taken as the value. Three sets E, F and G
are summated, i.e., sum(E), sum(F), and sum(G) are calculated respectively.
At step 2, suppose local acting electrode judgment threshold is Q, generally Q=0.
Judgment is carried out as to whether the following stands are not: sum(E) >Q, sum(F) >Q and sum(G) >Q, namely judging whether, among different local bus divisions, there are anodes having features indicating that the anode effect is about to occur.
If the above stands, the corresponding local bus needs to be raised and pressed.
Step 3 involves waiting for a mark of occurrence of the anode effect sent by a cell control machine. If the cell control machine confirms that the anode effect has already occurred, the local bus as determined in step 2 is raised and pressed to extinguish the anode effect that has already occurred.
The present invention relates to an apparatus for suppressing and extinguishing the anode effect as described above. The apparatus comprises: a voltage signal collecting processing and controlling system connected to the electrolytic cell anode guide rod and configured to determine an anode where the anode effect is about to occur, a crust-breaking and feeding means configured to perform supplementary feeding according to instructions sent by the voltage signal collecting processing and controlling system to suppress the occurrence of the anode effect and configured to correspond to the anode where the anode effect is about to occur, and an anode lifting mechanism configured to only raise and press local bus according to the position of the anode where the anode effect occurs if the anode effect occurs.
Embodiments of the present invention have already been illustrated in the drawings and description. Although technical terms are employed, these technical terms are only used in their broad sense and not intended to limit the present invention.
Changes and equivalent substitutes of the foregoing may be devised according to situations or expedient purposes without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (5)
1. A method for suppressing and extinguishing an anode effect, comprising the following steps: determining an anode where the anode effect is about to occur; allowing the electrolytic cell to feed through a feeding port corresponding to the anode where the anode effect is about to occur; if the anode effect occurs, only raising and pressing local bus according to the position of the anode where the anode effect occurs to extinguish the anode effect.
2. The method for suppressing and extinguishing an anode effect according to claim 1, characterized in that determining an anode where the anode effect is about to occur refers to: dividing anodes corresponding to different feeding ports, weighting the anodes corresponding to different feeding ports according to distances between the anodes and the feeding ports and according to progressive decrease of an electrolyte gradient around the feeding ports, and determining a position of the feeding port for feeding alumina to suppress occurrence of the anode effect after the number of features of anode effect at the anodes corresponding to different feeding ports is greater than a predetermined proportion.
3. The method for suppressing and extinguishing an anode effect according to claim 2, characterized in that a value of features of the anode effect occurring at the anode is 1, a value of features of anode effect not occurring at the anode is 0, values of features of anode effect at respective feeding ports are summated; assume a feeding port judgment threshold be P, 0<P<=1; judgment is performed as to comparison between a result of the sum of values of anode features corresponding to respective feeding ports dividing the number of anodes corresponding to the respective feeding ports and the P; if the result of the sum of values of anode features corresponding to respective feeding ports dividing the number of anodes corresponding to the respective feeding ports is greater than the P.
the feeding ports need to feed alumina and the feeding amount is a minimum which can suppress occurrence of the anode effect.
the feeding ports need to feed alumina and the feeding amount is a minimum which can suppress occurrence of the anode effect.
4. The method for suppressing and extinguishing an anode effect according to claim 1, characterized in that only raising and pressing local bus according to the position of the anode where the anode effect occurs to extinguish the anode effect comprises:
dividing the bus on both sides of the electrolytic cell into at least two regions, and controlling each of the regions by an anode lifting mechanism; determining a region needing local acting electrode; summating respective regions if the value of features possessed by the anode guide rod before occurrence of the anode effect is 1, and the value of features not possessed by the anode guide rod before occurrence of the anode effect is 0;
assume local acting electrode judgment threshold be Q, if the sum of the respective regions is greater than Q, a corresponding local bus needs to be raised and pressed.
dividing the bus on both sides of the electrolytic cell into at least two regions, and controlling each of the regions by an anode lifting mechanism; determining a region needing local acting electrode; summating respective regions if the value of features possessed by the anode guide rod before occurrence of the anode effect is 1, and the value of features not possessed by the anode guide rod before occurrence of the anode effect is 0;
assume local acting electrode judgment threshold be Q, if the sum of the respective regions is greater than Q, a corresponding local bus needs to be raised and pressed.
5. An apparatus for suppressing and extinguishing an anode effect for implementing the method according to any one of claims 1-4, characterized in that the apparatus comprises: a voltage signal collecting processing and controlling system connected to the electrolytic cell anode guide rod and configured to determine an anode where the anode effect is about to occur, a crust-breaking and feeding means configured to perform supplementary feeding according to instructions sent by the voltage signal collecting processing and controlling system to suppress the occurrence of the anode effect and configured to correspond to the anode where the anode effect is about to occur, and an anode lifting mechanism configured to only raise and press local bus according to the position of the anode where the anode effect occurs if the anode effect occurs.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110109898.2 | 2011-04-29 | ||
| CN201110109898.2A CN102758224B (en) | 2011-04-29 | 2011-04-29 | Anode effect inhibiting and extinguishing method |
| PCT/CN2012/000554 WO2012146060A1 (en) | 2011-04-29 | 2012-04-25 | Method and equipment for suppressing and extinguishing anode effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2834498A1 true CA2834498A1 (en) | 2012-11-01 |
Family
ID=47052865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2834498A Abandoned CA2834498A1 (en) | 2011-04-29 | 2012-04-25 | Method and apparatus for suppressing and extinguishing anode effect |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN102758224B (en) |
| CA (1) | CA2834498A1 (en) |
| NO (1) | NO20131575A1 (en) |
| WO (1) | WO2012146060A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105839145A (en) * | 2016-06-13 | 2016-08-10 | 中南大学 | Non-uniform blanking method for aluminum electrolytic bath |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3539461A (en) * | 1967-10-19 | 1970-11-10 | Kaiser Aluminium Chem Corp | Anode effect termination |
| SU526683A1 (en) * | 1974-04-22 | 1976-08-30 | Институт Автоматики | Method for automatic quenching of anode effects on aluminum electrolysis cells |
| JPS548109A (en) * | 1977-06-22 | 1979-01-22 | Mitsubishi Keikinzoku Kogyo | Controlling method of feeding alumina into aluminum electrolytic bath |
| US4654130A (en) * | 1986-05-15 | 1987-03-31 | Reynolds Metals Company | Method for improved alumina control in aluminum electrolytic cells employing point feeders |
| EP0353943A1 (en) * | 1988-08-04 | 1990-02-07 | Alcan International Limited | Process for terminating anode effects during the production of aluminum |
| CN1170961C (en) * | 2001-04-20 | 2004-10-13 | 贵阳铝镁设计研究院 | Automatic anode effect distinguishing method of aluminium electrolyzing production |
| RU2303658C1 (en) * | 2005-11-02 | 2007-07-27 | Общество с ограниченной ответственностью "Русская инжиниринговая компания" | Method for controlling technological process in aluminum cell with roasted anodes |
| CN101748445B (en) * | 2008-12-08 | 2012-10-10 | 贵阳铝镁设计研究院有限公司 | Anode effect sectionalized alarm method and device of electrolytic bath |
| CN201634783U (en) * | 2009-12-17 | 2010-11-17 | 沈阳铝镁设计研究院 | Zone control system for aluminum electrolysis cell |
| CN101967658B (en) * | 2010-11-18 | 2012-08-15 | 北方工业大学 | Aluminum cell anode effect prediction device |
-
2011
- 2011-04-29 CN CN201110109898.2A patent/CN102758224B/en active Active
-
2012
- 2012-04-25 CA CA2834498A patent/CA2834498A1/en not_active Abandoned
- 2012-04-25 WO PCT/CN2012/000554 patent/WO2012146060A1/en active Application Filing
-
2013
- 2013-11-28 NO NO20131575A patent/NO20131575A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| CN102758224A (en) | 2012-10-31 |
| CN102758224B (en) | 2015-02-25 |
| NO20131575A1 (en) | 2013-11-28 |
| WO2012146060A1 (en) | 2012-11-01 |
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| EEER | Examination request |
Effective date: 20131028 |
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| FZDE | Discontinued |
Effective date: 20160427 |