CN112010333A - Method for online control of dissolution liquid molecular ratio in Bayer process alumina production - Google Patents
Method for online control of dissolution liquid molecular ratio in Bayer process alumina production Download PDFInfo
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- CN112010333A CN112010333A CN201910454132.4A CN201910454132A CN112010333A CN 112010333 A CN112010333 A CN 112010333A CN 201910454132 A CN201910454132 A CN 201910454132A CN 112010333 A CN112010333 A CN 112010333A
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- 239000007788 liquid Substances 0.000 title claims abstract description 49
- 238000004090 dissolution Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 238000004131 Bayer process Methods 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000003513 alkali Substances 0.000 claims abstract description 30
- 238000001514 detection method Methods 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052681 coesite Inorganic materials 0.000 claims description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 229910052682 stishovite Inorganic materials 0.000 claims description 4
- 229910052905 tridymite Inorganic materials 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 2
- 230000029087 digestion Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 abstract description 2
- 239000012670 alkaline solution Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
- C01F7/062—Digestion
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
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- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Health & Medical Sciences (AREA)
- Nutrition Science (AREA)
- Geology (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method for controlling the molecular ratio of a dissolution liquid in Bayer process alumina production on line. The method for on-line control of molecular ratio of dissolving liquid in Bayer process alumina production is characterized by that an ore component on-line analyzer is mounted on the feeding belt of mill to detect ore component, according to the target value of molecular ratio of dissolving liquid and prediction model the alkali liquor flow rate is regulated, and the detected value of molecular ratio of dissolving liquid is fed back to prediction model to make model correction, and the prediction, feedback and feedforward are used to implement on-line control of molecular ratio of dissolving liquid. The invention has the advantages that: the invention can continuously detect the molecular ratio of the dissolution liquid on line, detect the Nk and the molecular ratio of the ore component and the post-alkali liquid on line, calculate the flow of the post-alkali liquid by the mathematical prediction model and timely adjust the flow of the post-alkali liquid, and can timely feed the detection value of the molecular ratio of the dissolution liquid to the prediction model for correction, thereby reducing the fluctuation of the molecular ratio of the dissolution liquid, leading the dissolution liquid to operate efficiently and maximizing the economic benefit.
Description
Technical Field
The invention relates to a method for online control of a molecular ratio of a dissolution liquid, in particular to a method for online control of a molecular ratio of a dissolution liquid in alumina production by a Bayer process.
Background
The molecular ratio of the dissolution liquid refers to Na in the liquid in the dissolution tail flash slurry2Ok and Al2O3The molar weight ratio is the main index of high-pressure dissolution, but because the domestic ore components are unstable and the alkali liquor concentration is unstable, the fluctuation of the molecular ratio of the dissolution liquid needs to be reduced by adjusting the flow of the added alkali liquor, so that the reaction dissolution rate and the cycle efficiency are optimal.
The control method of the molecular ratio of the dissolution liquid generally comprises the following steps: sampling is carried out once every 2h by a sampler on the tail flash discharge pipe, the tail flash discharge pipe is sent to a laboratory of the whole factory for analysis, the laboratory personnel filter ore pulp, and filtrate is titrated to detect Na of a dissolution liquid2Ok and Al2O3And (4) calculating the molecular ratio of the dissolution liquid. The laboratory staff inputs the laboratory result into the control table within 2h, and the main operator adjusts the flow of the alkali liquor according to the experience of the main operator, so that the molecular ratio of the dissolution liquid is kept within the required index range.
This control method has the following disadvantages: (1) the sampling worker samples randomly, and the samples have no pertinence; (2) the sample has larger influence along with the environment, and the test result has deviation; (3) the error exists in the operation process of the laboratory staff; (4) the time from the test result to the main control of the flow of the alkali liquor is generally 2 hours, and the lag is serious; (5) the master operation generally performs manual adjustment according to experience, and the master operation is too often adjusted or not in place.
Disclosure of Invention
In order to solve the problems, the invention provides a method for controlling the molecular ratio of a dissolution liquid in the Bayer process alumina production on line, and aims to timely and accurately adjust the flow of a post-alkali liquor and reduce the fluctuation range of the molecular ratio of the dissolution liquid.
In order to achieve the above object, the present invention is realized by: the method for on-line control of molecular ratio of dissolving liquid in Bayer process alumina production is characterized by that an ore component on-line analyzer is mounted on the feeding belt of mill to detect ore component, according to the target value of molecular ratio of dissolving liquid and prediction model the alkali liquor flow rate is regulated, and the detected value of molecular ratio of dissolving liquid is fed back to prediction model to make model correction, and the prediction, feedback and feedforward are used to implement on-line control of molecular ratio of dissolving liquid.
The ore component on-line analyzer detects the components of ore entering grinding stones: al (Al)2O3：40%～60%；SiO2：5%～15%；CaO: 3%～12%。
And Nk and the molecular ratio of the alkaline solution after the online detection, wherein Nk: 220-250 g/L; the molecular ratio is as follows: 2.8 to 3.1.
And adding the alkali liquor flow after the detection.
The flow of the post-alkali liquor is controlled by a post-alkali liquor pump by adopting a variable-frequency speed-regulating pump or an adjusting valve is arranged on a post-alkali liquor adding pipe.
The molecular ratio of the ore pulp at the last flash outlet of the online detection is 1.34-1.44.
And establishing a mathematical prediction model of the relation between the ore components and the post-alkali liquor.
The invention has the advantages that: the invention can continuously detect the molecular ratio of the dissolution liquid on line, and the Nk and the molecular ratio of the ore component and the post-alkali liquid on line, calculate the flow of the post-alkali liquid which is adjusted in time through a mathematical prediction model, and feed back the detection value of the molecular ratio of the dissolution liquid on line to the prediction model for correction. The fluctuation of the molecular ratio of the dissolution liquid can be reduced, the dissolution is operated efficiently, and the economic benefit is maximized.
Drawings
FIG. 1 is a control flow diagram of the present invention
In the figure: 1. a mill feed belt; 2. an ore composition on-line analyzer; 3. then adding an alkali liquor pump; 4. flow, Nk, molecular ratio and regulating valve on-line instruments; 5. a prediction model; 6. predicting; 7. the molecular ratio of the dissolution liquid is detected by an online instrument; 8. and (6) feeding back.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings, but the present invention is not limited to the embodiments.
Example 1
As shown in figure 1, a method for online control of a molecular ratio of a dissolution liquid in alumina production by a Bayer process is characterized in that an ore component online analyzer 2 is arranged on a mill feeding belt 1 to detect ore components, a flow, Nk, a molecular ratio and regulating valve online instrument 4 is arranged on an outlet pipe of a post-alkali liquor adding pump 3, the flow of the post-alkali liquor is regulated according to a target value of the molecular ratio of the dissolution liquid and a prediction model 5, model correction is carried out on the prediction model 5 through feedback 8 of a detection value 7 of the online instrument of the molecular ratio of the dissolution liquid, and online control of the molecular ratio of the dissolution liquid is realized through prediction 6, feedback 8 and feedforward.
The ore component on-line analyzer 2 detects the components of the ore entering the mill: al (Al)2O3：45%；SiO2：12%；CaO: 8%。
And Nk and the molecular ratio of the alkaline solution after the online detection, wherein Nk: 245 g/L; the molecular ratio is as follows: 3.0. the control value of the molecular ratio of the dissolution liquid is 1.38. And the alkali liquor adding flow rate is 300 m/h after calculation through a mathematical prediction model. And (4) detecting the molecular ratio of the ore pulp at the last flash outlet by on-line detection after dissolution to be 1.37.
And adjusting the opening of the increased alkali liquor adding adjusting valve of the prediction model 5 through feedback, and increasing the flow of the alkali liquor.
Example 2
In example 1, the on-line analyzer for ore content detected Al content in ore2O3：45%；SiO2：12%；CaO: 8%。
Adding Nk and the molecular ratio of the alkaline solution after online detection, wherein Nk: 245 g/L; the molecular ratio is as follows: 3.0.
the control value of the molecular ratio of the dissolution liquid is 1.39.
And the alkali liquor adding flow rate is 320 m/h after calculation through a mathematical prediction model.
And (4) detecting the molecular ratio of the ore pulp at the last flash outlet on line after dissolution to be 1.41.
And adjusting the model by feedback, reducing the opening of the later-added lye adjusting valve, and reducing the later-added lye flow.
Otherwise, the same procedure as in example 1 was repeated.
Example 3
The flow rate of the alkali solution added after the increase in the embodiment 1 is controlled by a variable frequency speed control pump, and the other steps are the same as those of the embodiment 1.
Claims (7)
1. The method is characterized in that an ore component online analyzer is arranged on a feeding belt of a mill to detect ore components, alkali liquor flow is added after adjustment according to a target value of the molecular ratio of the dissolution liquid and a prediction model, the detection value of the molecular ratio online analyzer of the dissolution liquid is fed back to the prediction model to carry out model correction, and online control of the molecular ratio of the dissolution liquid is realized through prediction, feedback and feedforward.
2. The method for the online control of the molecular ratio of the dissolution liquid in the Bayer process alumina production according to claim 1, wherein an ore component online analyzer detects the components of ore entering a mill: al (Al)2O3：40%～60%；SiO2：5%～15%；CaO: 3%～12%。
3. The method for the online control of the molecular ratio of the dissolution liquid in the Bayer process alumina production as recited in claim 1, characterized in that the Nk and the molecular ratio of the post-soda liquid are detected online, wherein Nk: 220-250 g/L; the molecular ratio is as follows: 2.8 to 3.1.
4. The method for the online control of the molecular ratio of the digestion solution in the Bayer process alumina production as recited in claim 1, wherein the flow rate of the post-alkali solution is detected.
5. The method for the online control of the molecular ratio of the leachate in the Bayer process alumina production according to claim 1, wherein the flow rate of the post-alkali liquor is controlled by a post-alkali liquor pump by adopting a variable-frequency speed-regulating pump or an adjusting valve is arranged on the post-alkali liquor pipe.
6. The method for the online control of the molecular ratio of the dissolution liquid in the Bayer process alumina production according to claim 1, wherein the molecular ratio of the slurry at the last flash outlet is detected in an online manner to be 1.34-1.44.
7. The method for the online control of the molecular ratio of the dissolution liquid in the Bayer process alumina production according to claim 1, characterized by establishing a mathematical prediction model of the relationship between the ore components and the post-addition lye.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910454132.4A CN112010333A (en) | 2019-05-29 | 2019-05-29 | Method for online control of dissolution liquid molecular ratio in Bayer process alumina production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910454132.4A CN112010333A (en) | 2019-05-29 | 2019-05-29 | Method for online control of dissolution liquid molecular ratio in Bayer process alumina production |
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|---|---|
| CN112010333A true CN112010333A (en) | 2020-12-01 |
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| CN201910454132.4A Pending CN112010333A (en) | 2019-05-29 | 2019-05-29 | Method for online control of dissolution liquid molecular ratio in Bayer process alumina production |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101372350A (en) * | 2007-08-23 | 2009-02-25 | 沈阳铝镁设计研究院 | Control system and control method for alkali liquor preparing system |
| CN104331622A (en) * | 2014-11-06 | 2015-02-04 | 中南大学 | Online prediction method for RSA (Ratio of Soda to Aluminate) of outlet solution of two-stream-process alumina dissolution process |
-
2019
- 2019-05-29 CN CN201910454132.4A patent/CN112010333A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101372350A (en) * | 2007-08-23 | 2009-02-25 | 沈阳铝镁设计研究院 | Control system and control method for alkali liquor preparing system |
| CN104331622A (en) * | 2014-11-06 | 2015-02-04 | 中南大学 | Online prediction method for RSA (Ratio of Soda to Aluminate) of outlet solution of two-stream-process alumina dissolution process |
Non-Patent Citations (1)
| Title |
|---|
| 詹海英等: "在线自动化检测系统在拜耳法生产氧化铝中的应用", 《世界有色金属》, 28 February 2019 (2019-02-28), pages 23 - 24 * |
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