CN101986162A - Device and method for measuring conductivity of industrial aluminum electrolyte on line - Google Patents
Device and method for measuring conductivity of industrial aluminum electrolyte on line Download PDFInfo
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- CN101986162A CN101986162A CN 201010263321 CN201010263321A CN101986162A CN 101986162 A CN101986162 A CN 101986162A CN 201010263321 CN201010263321 CN 201010263321 CN 201010263321 A CN201010263321 A CN 201010263321A CN 101986162 A CN101986162 A CN 101986162A
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Abstract
The invention relates to a device and method for measuring the conductivity of industrial aluminum electrolyte on line, belonging to the technical field of aluminum electrolysis. The device comprises a measurement system, a control system, a reading system and a mobile and lifting system, wherein the measurement system comprises a conductance cell and a guide rod; the control system comprises a power supply and a PLC (programmable logic controller); the reading system comprises an RLC (radio link control) tester and an industrial tablet personal computer; the mobile and lifting system comprises a servo motor and a support; a power supply is respectively connected with the PLC, the RLC tester, the industrial tablet personal computer and the servo motor; the industrial tablet personal computer is respectively connected with the PLC and the RLC tester; the PLC is connected with the control port of the servo motor; the motor shaft of the servo motor is connected with the support; the support is connected with the conductance cell through the guide rod; and the guide rod is connected with the probe of the RLC tester. The method is as follows: a calibrated conductance cell constant k is used, the RLC tester is utilized to measure the resistance R of the electrolyte to be tested in the conductance cell, and the conductivity of the electrolyte to be tested is determined.
Description
Technical field:
The invention belongs to technical field of aluminum electrolysis, particularly relate to a kind of industrial aluminum electrolytic conductivity on-line measurement device and measuring method.
Background technology:
Adopt electrolyzing fused cryolite-method of alumina to produce primary aluminum in the modern industry, and to wherein adding calcium fluoride, lithium fluoride etc. to improve the physicochemical property of aluminium electrolyte.Aluminium electrolytic industry is high energy consumption industry, yet, be not that all direct currents all are used for electrolysis of aluminum oxide, some direct current is owing to the ohmic voltage drop of aluminium electrolyte consumes; Therefore, the conductivity of raising aluminium electrolyte has great importance for reduction aluminium electroloysis energy consumption, raising current efficiency.So, carry out on-the-spot The real time measure for the electrolytical conductivity of industrial aluminum, seem very crucial.
The conductance measurement of high-temperature electrolysis matter is all carried out in conductance cell usually, and conductance cell needs fixing cell constant of conductometric vessel, therefore needs its Stability Analysis of Structures, and the used material require of conductance cell has anti-aluminium electrolyte corrosivity and good thermal shock resistance.In addition, have electromagnetic field in the aluminium electrolysis shop, can produce electronic device and disturb, this also is a main cause of restriction industrial aluminum electrolytic conductivity on-line measurement.At present, the measurement of industrial aluminum electrolytic conductivity is all adopted usually electrolyte is taken out, and delivers to after the condensation to carry out in the analysis room again; The way that this non real-time is measured is consuming time longer.
Summary of the invention:
Problem at prior art exists the invention provides a kind of industrial aluminum electrolytic conductivity on-line measurement device and measuring method that can realize the on-line measurement of industrial aluminum electrolytic conductivity convenient, fast, exactly.
To achieve these goals, the present invention adopts following technical scheme, a kind of industrial aluminum electrolytic conductivity on-line measurement device, comprise measuring system, control system, frame of reference and mobile, jacking system, described measuring system comprises conductance cell and guide rod, described control system comprises power supply and PLC, and described frame of reference comprises RLC tester and industrial panel computer, describedly moves, jacking system comprises servomotor and support; Described power supply is connected with PLC, RLC tester, industrial panel computer and servomotor respectively, described industrial panel computer is connected with the RLC tester with PLC respectively, described PLC is connected with the control port of servomotor, the motor shaft of servomotor is connected with support, described support is connected with conductance cell by guide rod, and described guide rod is connected with the probe of RLC tester.
Described conductance cell comprises that the bottom has the graphite crucible of through hole, around the graphite crucible inboard, be provided with liner, be provided with the dop that the center has the electrode through hole above liner, be provided with electrode above described graphite crucible, electrode is corresponding with the electrode through hole at dop center; Described graphite crucible is connected with support mobile, jacking system by guide rod respectively with electrode, and described guide rod is connected with two probes of RLC tester respectively.
In order to save cost, the part that described guide rod does not contact with electrolyte adopts the high temperature stainless steel material to make, and the part that contacts with electrolyte adopts platinum to make.
Described electrode adopts platinum to make.
The liner of described graphite crucible inboard adopts boron nitride material to make, and boron nitride has potential resistance to electrolyte contamination corrosion and the big characteristic of resistivity, can prevent that the graphite crucible sidepiece from contacting the generation electron transfer with electrolyte.
Described dop adopts boron nitride material to make.
In order to shield the electromagnetic interference (EMI) in the aluminium electrolysis shop, can and move frame of reference, control system, jacking system places in the stainless steel casing.
Move for convenience, described stainless steel casing can be placed on the dolly.
The power supply of described control system comprises accumulator and uninterrupted power source UPS, is powered for uninterrupted power source UPS by accumulator.
The measuring method of described industrial aluminum electrolytic conductivity on-line measurement device comprises the steps:
Step 1: the demarcation of cell constant of conductometric vessel;
Electrolytical Conductivity Calculation formula is as follows:
Be out of shape by formula (1-1):
k＝κ*R (1-2)
In the formula, κ is electrolytical conductivity, and unit is Scm
-1R is electrolytical resistance, and unit is ω; K is a cell constant of conductometric vessel, and unit is cm
-1, its value is only relevant with the structure of conductance cell;
Inject the fused salt or the aqueous solution of known conductivity in conductance cell, adopt the RLC tester to measure electrolytical resistance in the conductance cell, (1-2) determines cell constant of conductometric vessel k according to formula;
Step 2: use the cell constant of conductometric vessel k that demarcates in the step 1, adopt the RLC tester to measure electrolytical resistance to be measured in the conductance cell, determine electrolytical conductivity to be measured according to formula (1-1).
Beneficial effect of the present invention:
The present invention can realize accurately that the online in real time of industrial aluminum electrolytic conductivity measures, and for the improvement of aluminum electrolysis process parameter provides the foundation, thereby has improved current efficiency, has reduced direct current consumption.
In addition, because frame of reference of the present invention, control system and move, jacking system places in the stainless steel casing, can shield the interference of electromagnetic field in the aluminium electrolysis shop effectively; The stainless steel casing places on the dolly, can conveniently move, and the online in real time that more helps electrolytic conductivity is measured.
Description of drawings:
Fig. 1 is the structural representation of measurement mechanism of the present invention;
Fig. 2 is the structural representation of measuring system of the present invention;
Fig. 3 be of the present inventionly move, the structural representation of jacking system;
Fig. 4 is the right view of Fig. 3;
Fig. 5 is the program flow diagram of the measuring method of measurement mechanism of the present invention;
Among the figure, 1-control system, 2-measuring system, 3-frame of reference, 4-moves, jacking system, 5-conductance cell, 6-through hole, the 7-graphite crucible, 8-liner, 9-dop, 10-electrode through hole, 11-electrode, 12-guide rod, the 13-support, 14-slideway, 15-rocking bar, 16-stainless steel casing, 17-dolly, 18-industry panel computer.
Embodiment:
As shown in Figure 1, a kind of industrial aluminum electrolytic conductivity on-line measurement device, comprise measuring system 2, control system 1, frame of reference 3 and mobile, jacking system 4, described measuring system 2 comprises conductance cell and guide rod, described control system 1 comprises power supply and PLC, described frame of reference 3 comprises RLC tester and industrial panel computer, describedly moves, jacking system 4 comprises servomotor and support; Described power supply is connected with PLC, RLC tester, industrial panel computer and servomotor respectively, described industrial panel computer is connected with the RLC tester with PLC respectively, described PLC is connected with the control port of servomotor, the motor shaft of servomotor is connected with support, described support is connected with conductance cell by guide rod, and described guide rod is connected with the probe of RLC tester.
As shown in Figure 2, described conductance cell 5 comprises that the bottom has the graphite crucible 7 of through hole 6, around graphite crucible 7 inboards, be provided with liner 8, the center that is provided with above liner 8 has the dop 9 of electrode through hole 10, be provided with electrode 11 above described graphite crucible 7, electrode 11 is corresponding with the electrode through hole 10 at dop 9 centers; Described graphite crucible 7 is connected with support 13 mobile, jacking system 4 by guide rod 12 respectively with electrode 11, and described guide rod 12 is connected with two probes of RLC tester respectively.Described electrode 11 and guide rod 12 resistance own are very little.
In order to save cost, the part that described guide rod does not contact with electrolyte adopts the high temperature stainless steel material to make, and the part that contacts with electrolyte adopts platinum to make.
Described electrode adopts platinum to make.
The liner of described graphite crucible inboard adopts boron nitride material to make, and boron nitride has potential resistance to electrolyte contamination corrosion and the big characteristic of resistivity, can prevent that the graphite crucible sidepiece from contacting the generation electron transfer with electrolyte.
Described dop adopts boron nitride material to make.
As shown in Figure 3, Figure 4, in order to shield the electromagnetic interference (EMI) in the aluminium electrolysis shop, can and move frame of reference 3, control system 1, jacking system 4 places in the stainless steel casing 16.
Move for convenience, described stainless steel casing 16 can be placed on the dolly 17.
The power supply of described control system comprises accumulator and uninterrupted power source UPS, is powered for uninterrupted power source UPS by accumulator.
In measuring process,, jacking system mobile by control system control of the present invention is immersed in conductance cell in the industrial electrolysis matter; When conductance cell was immersed in the electrolyte, electrolyte entered into graphite crucible inside from the through hole of graphite crucible bottom.Can carry out the lifting of conductance cell and the reading measuring operation of electrolytic conductivity by industrial panel computer; Can realize moving forward and backward of conductance cell by rocking bar 15.By industrial panel computer and PLC control servomotor, can make it carry out translation and vertical moving by traversing carriage.
As shown in Figure 5, the measuring method of described industrial aluminum electrolytic conductivity on-line measurement device comprises the steps:
Step 1: the demarcation of cell constant of conductometric vessel;
Electrolytical Conductivity Calculation formula is as follows:
Be out of shape by formula (1-1):
k＝κ*R (1-2)
In the formula, κ is electrolytical conductivity, and unit is Scm
-1R is electrolytical resistance, and unit is ω; K is a cell constant of conductometric vessel, and unit is cm
-1, its value is only relevant with the structure of conductance cell;
In conductance cell, inject the fused salt or the aqueous solution of known conductivity, adopt the RLC tester to measure electrolytical resistance in the conductance cell, can read electrolytical resistance in the conductance cell accurately by high-precision RLC tester, resistance value can show by industrial panel computer; Then, determine cell constant of conductometric vessel k according to formula (1-2);
Step 2: use the cell constant of conductometric vessel k that demarcates in the step 1, adopt the RLC tester to measure electrolytical resistance to be measured in the conductance cell, determine electrolytical conductivity to be measured according to formula (1-1).
Embodiment 1:
Use the present invention to measure 1010 ℃ of following Na
3AlF
6-6wt%Al
2O
3Conductivity, the Na under wherein cell constant of conductometric vessel adopts 1000 ℃
3AlF
6Demarcate, its conductivity is 2.80Scm
-1Record 1010 ℃ of following Na
3AlF
6-6wt%Al
2O
3Conductivity be 2.45Scm
-1, the conductivity value 2.43Scm of this and bibliographical information
-1Very approaching, its difference 0.02Scm
-1Belong to the scope that error allows.
Embodiment 2:
Use the present invention to measure the 2.5NaFAlF of configuration voluntarily
3-3wt%Al
2O
3-3wt%LiF-4wt%CaF
2-2wt%MgF
2Conductivity under 945 ℃, the Na under wherein cell constant of conductometric vessel adopts 1000 ℃
3AlF
6Demarcate, the conductivity that records is 2.75Scm
-1, the conductivity of same electrolyte under uniform temp that Wang was measured in 1992 is 2.76Scm
-1, difference is 0.01Scm
-1, illustrate that the conductivity that the present invention records is very accurate.
Embodiment 3:
Use the present invention that the conductivity of certain aluminium electrolysis shop is tested, temperature is 940 ℃, the Na under wherein cell constant of conductometric vessel adopts 1000 ℃
3AlF
6Demarcate, electrolytical composition has been carried out chemical analysis, obtaining its molecular proportion is 2.2, and electrolytical composition is as shown in table 1.
The electrolytical chemical composition of table 1 test
Component content (wt%)
2.2NaF·AlF
3 88.78
Al
2O
3 3.25
CaF
2 4.16
LiF 3.81
Wang has provided the 900-1050 ℃ of regression equation of polynary aluminium electrolyte Conductivity Calculation down, shown in equation (1):
lnκ＝1.9105+0.1620·CR-17.38×10
-3·％Al
2O
3-3.955×10
-3·％CaF
2-9.227×10
-3·％MgF
2+21.55×10
-3·％LiF-1.7457×10
3/T (1)
In the formula: κ is electrolytical conductivity, and unit is Scm
-1%Al
2O
3, %CaF
2, %MgF
2Be respectively the quality percentage composition of respective substance with %LiF; T is for measuring electrolytical temperature, and unit is K.The measurement range of this equation content of material is 0-8wt%.
The conductivity of using the present invention to record is 2.35Scm
-1, this electrolytical conductivity that adopts equation (1) to calculate is 2.31Scm
-1, difference is 0.04Scm
-1, because regression equation itself just has certain error; Therefore, the conductivity that records of the present invention is very accurate.
Claims (10)
1. industrial aluminum electrolytic conductivity on-line measurement device, it is characterized in that comprising measuring system, control system, frame of reference and mobile, jacking system, described measuring system comprises conductance cell and guide rod, described control system comprises power supply and PLC, described frame of reference comprises RLC tester and industrial panel computer, describedly moves, jacking system comprises servomotor and support; Described power supply is connected with PLC, RLC tester, industrial panel computer and servomotor respectively, described industrial panel computer is connected with the RLC tester with PLC respectively, described PLC is connected with the control port of servomotor, the motor shaft of servomotor is connected with support, described support is connected with conductance cell by guide rod, and described guide rod is connected with the probe of RLC tester.
2. industrial aluminum electrolytic conductivity on-line measurement device according to claim 1, it is characterized in that described conductance cell comprises that the bottom has the graphite crucible of through hole, around the graphite crucible inboard, be provided with liner, above liner, be provided with the dop that the center has the electrode through hole, be provided with electrode above described graphite crucible, electrode is corresponding with the electrode through hole at dop center; Described graphite crucible is connected with support mobile, jacking system by guide rod respectively with electrode, and described guide rod is connected with two probes of RLC tester respectively.
3. industrial aluminum electrolytic conductivity on-line measurement device according to claim 1 is characterized in that the part that described guide rod does not contact with electrolyte adopts the high temperature stainless steel material to make, and the part that contacts with electrolyte adopts platinum to make.
4. industrial aluminum electrolytic conductivity on-line measurement device according to claim 2 is characterized in that described electrode adopts platinum to make.
5. industrial aluminum electrolytic conductivity on-line measurement device according to claim 2 is characterized in that the liner of described graphite crucible inboard adopts boron nitride material to make.
6. industrial aluminum electrolytic conductivity on-line measurement device according to claim 2 is characterized in that described dop adopts boron nitride material to make.
7. industrial aluminum electrolytic conductivity on-line measurement device according to claim 1, it is characterized in that described frame of reference, control system and move, jacking system places in the stainless steel casing.
8. industrial aluminum electrolytic conductivity on-line measurement device according to claim 7 is characterized in that described stainless steel casing places on the dolly.
9. industrial aluminum electrolytic conductivity on-line measurement device according to claim 1 is characterized in that the power supply of described control system comprises accumulator and uninterrupted power source UPS, is powered for uninterrupted power source UPS by accumulator.
10. the measuring method of the described industrial aluminum electrolytic conductivity of claim 1 on-line measurement device is characterized in that, comprises the steps:
Step 1: the demarcation of cell constant of conductometric vessel;
Electrolytical Conductivity Calculation formula is as follows:
Be out of shape by formula (1-1):
k＝κ*R (1-2)
In the formula, κ is electrolytical conductivity, and unit is Scm
-1R is electrolytical resistance, and unit is ω; K is a cell constant of conductometric vessel, and unit is cm
-1, its value is only relevant with the structure of conductance cell;
Inject the fused salt or the aqueous solution of known conductivity in conductance cell, adopt the RLC tester to measure electrolytical resistance in the conductance cell, (1-2) determines cell constant of conductometric vessel k according to formula;
Step 2: use the cell constant of conductometric vessel k that demarcates in the step 1, adopt the RLC tester to measure electrolytical resistance to be measured in the conductance cell, determine electrolytical conductivity to be measured according to formula (1-1).
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| CN 201010263321 CN101986162B (en) | 2010-08-26 | 2010-08-26 | Device and method for measuring conductivity of industrial aluminum electrolyte on line |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103175840A (en) * | 2011-12-21 | 2013-06-26 | 北京兆维电子(集团)有限责任公司 | Offset plate surface detection method and system based on machine vision |
| CN103344840A (en) * | 2013-07-03 | 2013-10-09 | 东北大学 | Method and device for conducting absolute measurement on electrical conductivity of solution and high-temperature melt |
| CN103388149A (en) * | 2013-07-22 | 2013-11-13 | 中国船舶重工集团公司第七二五研究所 | Electrochemical performance testing device for sacrificial anode |
| CN104749445A (en) * | 2013-12-25 | 2015-07-01 | 湖南创元铝业有限公司 | Molten salt and molten slag conductivity detection equipment and detection method |
| CN112845518A (en) * | 2020-12-30 | 2021-05-28 | 中铝环保节能集团有限公司 | Method for high-value utilization of carbon slag |
| CN114018986A (en) * | 2021-11-03 | 2022-02-08 | 辽宁大学 | Method for measuring conductivity of powdery semiconductor material |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175840A (en) * | 2011-12-21 | 2013-06-26 | 北京兆维电子(集团)有限责任公司 | Offset plate surface detection method and system based on machine vision |
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| CN103344840A (en) * | 2013-07-03 | 2013-10-09 | 东北大学 | Method and device for conducting absolute measurement on electrical conductivity of solution and high-temperature melt |
| CN103344840B (en) * | 2013-07-03 | 2015-05-20 | 东北大学 | Method and device for conducting absolute measurement on electrical conductivity of solution and high-temperature melt |
| CN103388149A (en) * | 2013-07-22 | 2013-11-13 | 中国船舶重工集团公司第七二五研究所 | Electrochemical performance testing device for sacrificial anode |
| CN103388149B (en) * | 2013-07-22 | 2015-06-03 | 中国船舶重工集团公司第七二五研究所 | Electrochemical performance testing device for sacrificial anode |
| CN104749445A (en) * | 2013-12-25 | 2015-07-01 | 湖南创元铝业有限公司 | Molten salt and molten slag conductivity detection equipment and detection method |
| CN112845518A (en) * | 2020-12-30 | 2021-05-28 | 中铝环保节能集团有限公司 | Method for high-value utilization of carbon slag |
| CN114018986A (en) * | 2021-11-03 | 2022-02-08 | 辽宁大学 | Method for measuring conductivity of powdery semiconductor material |
| CN114018986B (en) * | 2021-11-03 | 2024-03-22 | 辽宁大学 | Method for measuring conductivity of powdery semiconductor material |
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