CN1096609C - Method for on-line testing sodium aluminate solution in production of aluminium oxide - Google Patents
Method for on-line testing sodium aluminate solution in production of aluminium oxide Download PDFInfo
- Publication number
- CN1096609C CN1096609C CN 97107437 CN97107437A CN1096609C CN 1096609 C CN1096609 C CN 1096609C CN 97107437 CN97107437 CN 97107437 CN 97107437 A CN97107437 A CN 97107437A CN 1096609 C CN1096609 C CN 1096609C
- Authority
- CN
- China
- Prior art keywords
- temperature
- conductivity
- sodium aluminate
- aluminate solution
- solution
- 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 - Fee Related
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims abstract description 12
- 229910001388 sodium aluminate Inorganic materials 0.000 title claims abstract description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims description 17
- 238000012360 testing method Methods 0.000 title claims description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 235000011121 sodium hydroxide Nutrition 0.000 claims abstract description 8
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000012452 mother liquor Substances 0.000 claims description 11
- 238000013178 mathematical model Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 20
- 239000000203 mixture Substances 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 229940021013 electrolyte solution Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The present invention discloses a method for detecting sodium aluminate solution on line in the process of producing aluminum oxide. In the production process, the method detects the actual temperature T1 and the electric conductivity Y1 at one point and the temperature T2 and the electric conductivity Y2 after the temperature is changed and calculates the contents of caustic soda and aluminum oxide in the sodium aluminate solution according to the detected temperature T1 and T2 and the electric conductivity Y1 and Y2. The present invention has the advantages of high measurement precision, high detection speed, continuous detection, easy realization of real-time control of the full automation production, etc.
Description
The present invention relates to a kind of detection method of concentration of electrolyte solutions.
At present, in the alumina producing flow process, the industrial sodium aluminate solution composition relies on hand sampling always, chemico-analytic means obtain, because hand sampling, sample presentation and chemical analysis need the long time, mass flow can not in time be adjusted according to the variation of solution composition in the production control post, and the qualification rate of production technology index is difficult to guarantee; And the external method that generally adopts now is: earlier solution is taken a sample, progressively with solution dilution, measure the conductivity of variable concentrations simultaneously, and then the composition of calculating solution, whole testing process all will be carried out under constant temperature, and this detection method not only detection speed is slow but also can not detect continuously.
The objective of the invention is: the online detection method method to sodium aluminate solution in the aluminum oxide production process is provided in one, in time be transferred to real-time detected solution concentration value and molecular proportion in the production control system, for the automatic control of production run provides foundation, improve technic index, improve product quality and yield, reduce consuming.
The present invention is achieved in that the actual temperature T of the sodium aluminate solution of certain point in process of production
1With conductivity Y
1And with the temperature T behind its alternating temperature
2With conductivity Y
2Carry out online detection, and according to detected temperature T
1, T
2With conductivity Y
1, Y
2By the mathematical model and the corresponding mathematical operation of setting up, calculate the content and the solution molecule ratio of sodium hydroxide and aluminium oxide in the sodium aluminate solution;
Its conductivity mathematical model adopts following formula:
Y＝C
0+C
1N
K+C
2α
K+C
3T+C
4N
Kα
K+C
5N
KT+C
6α
KT+C
7N
K 2+C
8α
K 2+C
9T
2
In the formula, C
0～C
9Be the regression equation coefficient, i.e. the constant that test obtains;
Y is into the conductivity of grinding mother liquor, the S.cm of unit
-1
N
KBe caustic soda concentration, the g/l of unit;
T is for going into to grind the mother liquor temperature, unit ℃;
Be α
K=1.645N
K/ A, A is into the alumina concentration that grinds mother liquor in the formula, the g/l of unit).
The present invention compares with conventional detection, has the accuracy of detection height, detection speed is fast and can detects, realize easily full-automatic advantages such as real-time control continuously.Because the correspondence of the solution temperature of online detection and conductivity is good, accuracy is high and set up conductivity easily and temperature and detected solution parameter between the mathematical model that concerns, and the simulation of the conductivity mathematical model of being set up is good, shoot straight, so only need the high-temperature conductivity Y with the same solution of online detection
1And low-temperature conductivity Y
2And corresponding temperature T
1, T
2Measure and the substitution mathematical model in can obtain sodium hydroxide and alumina content and solution molecule ratio in the sodium aluminate solution after machine is handled as calculated.
Embodiments of the invention: go into to grind to get in the mother liquor two groups in solution sample from aluminum oxide production process, one group directly enters detecting device, measures temperature T
1With conductivity Y
1, another group enters detecting device again after the subcooler cooling, measure temperature T
2With conductivity Y
2, detecting device is with the T that measures
1, T
2, Y
1, Y
2Be input to computing machine, calculate in the mathematical model that computing machine is set up the data substitution that records, thereby calculate the sodium hydroxide in the solution and the content and the solution molecule ratio of aluminium oxide.To going into to grind mother liquor in the aluminum oxide production process, the mathematical model of conductivity is:
Y＝C
0+C
1N
K+C
2αK+C
3T+C
4N
KαK+C
5N
KT+C
6αKT+C
7N
K 2+C
8αK 2+C
9T
2
In the formula, C
0～C
9Be the regression equation coefficient, i.e. the constant that test obtains;
Y is into the conductivity of grinding mother liquor, the S.cm of unit
-1
N
KBe caustic soda concentration, the g/l of unit;
T is for going into to grind the mother liquor temperature, unit ℃;
Be α
K=1.645N
K/ A, A is into the alumina concentration that grinds mother liquor in the formula, the g/l of unit).
To detect temperature T
1, T
2With conductivity Y
1, Y
2Substitution conductivity digital model obtains following two equations:
Y
1＝C
0+C
1N
K+C
2αK+C
3T
1+C
4N
KαK+C
5N
KT
1+C
6αKT
1+C
7N
K 2+C
8αK 2+C
9T
1 2
Y
2＝C
0+C
1N
K+C
2αK+C
3T
2+C
4N
KαK+C
5N
KT
2+C
6αKT
2+C
7N
K 2+C
8αK 2+C
9T
2 2
Above-listed two equation solutions of simultaneous can obtain N
KWith
α K, pass through formula
α K=1.645N
K/ A obtains A.
Claims (1)
1, method for on-line testing sodium aluminate solution in a kind of aluminum oxide production process is characterized in that: to the actual temperature T of the sodium aluminate solution of certain point in process of production
1With conductivity Y
1And with the temperature T behind its alternating temperature
2With conductivity Y
2Carry out online detection, and according to detected temperature T
1, T
2With conductivity Y
1, Y
2By the mathematical model and the corresponding mathematical operation of setting up, calculate the content and the solution molecule ratio of sodium hydroxide and aluminium oxide in the sodium aluminate solution;
Its conductivity mathematical model adopts following formula:
Y＝C
0+C
1N
K+C
2α
K+C
3T+C
4N
Kα
K+C
5N
KT+C
6α
KT+C
7N
K 2+C
8α
K 2+C
9T
2
In the formula, C
0～C
9Be the regression equation coefficient, i.e. the constant that test obtains;
Y is into the conductivity of grinding mother liquor, the S.cm of unit
-1
N
KBe caustic soda concentration, the g/l of unit;
T is for going into to grind the mother liquor temperature, unit ℃;
α
KBe the molecular proportion of solution, i.e. α
K=1.645N
K/ A, A is into the alumina concentration that grinds mother liquor in the formula, the g/l of unit).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97107437 CN1096609C (en) | 1997-04-09 | 1997-04-09 | Method for on-line testing sodium aluminate solution in production of aluminium oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97107437 CN1096609C (en) | 1997-04-09 | 1997-04-09 | Method for on-line testing sodium aluminate solution in production of aluminium oxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1175691A CN1175691A (en) | 1998-03-11 |
| CN1096609C true CN1096609C (en) | 2002-12-18 |
Family
ID=5169556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97107437 Expired - Fee Related CN1096609C (en) | 1997-04-09 | 1997-04-09 | Method for on-line testing sodium aluminate solution in production of aluminium oxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1096609C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281182B (en) * | 2008-05-22 | 2012-02-22 | 沈阳东大自动化有限公司 | Method for soft measuring sodium aluminate solution component concentration |
| WO2017172866A1 (en) * | 2016-03-31 | 2017-10-05 | Invista North America S.A R.L. | Electrical conductivity or resistivity measurement and polyamide synthesis |
| CN107764850B (en) * | 2016-08-23 | 2021-02-12 | 沈阳铝镁设计研究院有限公司 | Method for online detection of molecular ratio of alumina high-pressure digestion pulp |
-
1997
- 1997-04-09 CN CN 97107437 patent/CN1096609C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1175691A (en) | 1998-03-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20021218 |