CN101812589A - Control method of rare earth extraction process based on ion characteristic color identification - Google Patents
Control method of rare earth extraction process based on ion characteristic color identification Download PDFInfo
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Abstract
A control method of extraction process based on automatic rare-earth ion characteristic color identification is characterized by determining the offset of the relative best position of the rare-earth ion characteristic color band in an extraction tank by acquiring the ion characteristic color information in the rare-earth extraction process in real time and applying the image processing technology and the mode identification method aiming at an extraction separation system, with the characteristic color, of the rare-earth ions; developing the control method of extraction process based on the offset of the rare-earth ion characteristic color band by utilizing the intelligent control theory and technology; and obtaining the best control parameter of the rare-earth extraction separation process, thereby realizing automatic control of the rare-earth extraction separation process. The invention is applicable to automatic control and optimal operation of the extraction separation production process, with the characteristic color, of the rare-earth ions.
Description
Technical field
The present invention relates to the control method of rare earth extraction separation production process, belong to rare-earth wet method metallurgical technology and manufacturing informatization field.
Background technology
Since the seventies in 20th century, under the cascade extraction theoretical direction, the solvent extraction and separation technology of rare earth has become the main method that China's rare-earth industry is produced.Because the component of rare earths material is many, the character between rare earth element is very similar, so the progression of rare-earth cascade extraction system is many, is input more than, many output, large time delay, non-linear and cross coupling complicated Industrial processes.China's rare-earth industry Automation of Manufacturing Process equipment is generally lower at present, still rest on off-line analysis, manual setting, experience controlled levels, cause that enterprises production efficiency is low, resource consumption is big, unstable product quality, becomes the bottleneck of restriction China rare-earth industry development.
Accumulation volume is important parameter in the extraction process.Early stage people have introduced this notion when setting up the calculating of rare earth extraction process dynamic simulation, and systematic study the influence of level of platoon leader comparison outlet purity, accumulation volume, progression, quality of balance etc. in the dynamic process, set forth the variation of intermediate component accumulation peak in the polycomponent extraction system, accumulation volume with extraction quantity.Someone utilizes cascade extraction static state and dynamic simulation program that two component rare earth extraction systems have been carried out analog calculation, obtains different separation factors, raw material composition and the outlet purity Changing Pattern to extraction section and washing section purity gradient and accumulation volume.The strong and weak difference of each element and extraction agent sequestering power distributes according to certain rules with the level preface, and the separating effect between each element is an outwardness, and each elementary composition content can have in various degree accumulation and enrichment, formation accumulation peak in cell body.Easily the collection component is enriched in washing section, and difficult collection component is enriched in extraction section, and shows its characteristic color respectively, obtains the isolating while at rare earth element, and the characteristic color of rare earth ion also displays.When condition changed in the production process, the characteristic color that is embodied in rare earth ion moved forward and backward.The someone has studied the feasibility that the characteristic color that utilizes rare earth ion carries out the cascade extraction technology controlling and process in view of the above, but only rests on on-the-spot manual observation and manual experience adjustments stage, really is not applied to rare earth extraction Automation of Manufacturing Process control as yet.
Summary of the invention
The objective of the invention is, utilize the characteristic color of rare earth ion to carry out the cascade extraction technology controlling and process, to realize the automatization control of Rare Earth Separation production process.
Technical scheme of the present invention is: have the extracting and separating system of characteristic color at rare earth ion, determine the side-play amount of the relative optimum position of extraction cell body middle-weight rare earths ion characteristic color band by real-time collection rare earth extraction process intermediate ion characteristic color information, application image treatment technology and mode identification method; Adopt Intelligent Control Theory and forecast Control Algorithm research to set up the extraction process control method of discerning based on the rare earth ion characteristic color; Obtain the rare-earth extraction separating process optimization control parameter, adjust extraction agent and washings flow in the rare earth extraction process automatically; Thereby realize automatic control, make the Rare Earth Separation production process realize automatization control the rare earth extraction sepn process.
In polycomponent rare-earth cascade extraction separation production process, each component has accumulation and enrichment in various degree in cell body, and shows its ion characteristic color respectively.When the production process condition changes, each elementary composition content distribution in cell body will change, and be embodied in the moving forward and backward of characteristic color band of rare earth ion.The present invention proposes a kind of method that replaces the definite indirectly component concentration of traditional instrumental analysis means of testing to distribute with ion characteristic color information ONLINE RECOGNITION; Propose the video information collection and the digital image processing method of rare earth ion characteristic color, judge that automatically the ion characteristic color band departs from the progression of optimum regime; According to the ion characteristic color side-play amount, adopt artificial intelligence theory and intelligent control technology, the extraction process control method based on the ion characteristic color ONLINE RECOGNITION is set up in research, obtains the rare-earth extraction separating process optimization control parameter, thereby realizes the automatic control to the rare earth extraction sepn process.
The first, according to the cascade extraction theory, rare earth ion constantly carries out ion exchange reaction, and the component of easily coming together is enriched in washing section, and difficult collection component is enriched in extraction section, and shows its characteristic color respectively.With several cell bodies of front and back at ion characteristic color variable gradient maximum value place as the video monitoring point, in case extraction process changes, corresponding moving also taken place in the color of cell body, be located under the normal extraction process condition, ion characteristic color variable gradient maximum value is at J level cell body, and each n cell body before and after this J level cell body as the video monitoring point.Can arrange total 2n+1 video monitoring point according to cell body level preface, i.e. J-n ..., J-1, J, J+1 ..., J+n.Utilize digital image processing techniques that the graphic information that collects from 2n+1 video monitoring point is differentiated, obtain the progression that the characteristic color band moves forward and backward, it differentiates flow process as shown in Figure 1.
The second, use for reference technology expertise and operator's experience, adopt the control method of rare earth extraction process of Intelligent Control Theory and forecast Control Algorithm foundation, obtain little with the quality product fluctuation, as to satisfy direct yield constraint condition optimal processing parameter based on dissimilar characteristic color information.As the changes delta e that the first step detected the rare earth ion characteristic color band side-play amount e obtain and side-play amount thereof input, the increment Delta V of extraction agent and washings flow as controller
SWith Δ V
WOutput as controller.The fuzzy controller Rule Design is as follows:
IF (reach of rare earth color belt), THEN (reduces washing amount V
W);
IF (reach of rare earth color belt), THEN (increases organic extraction amount V
S);
IF (rare earth color tape backspacing), THEN (increases washing amount V
W);
IF (rare earth color tape backspacing), THEN (reduces organic extraction amount V
S); Deng
According to above-mentioned fuzzy control rule, carry out fuzzy logic inference, provide the optimum control amount of extraction agent or washings at last, its structure of fuzzy controller block diagram is as shown in Figure 2.
Fuzzy controller partly is made up of obfuscation computing, knowledge base, fuzzy reasoning, sharpening calculating etc.
The obfuscation computing:
Rare earth ion characteristic color band side-play amount e that detection is obtained and variable quantity e ' thereof are as the input of Fuzzy control system, the increment Delta V of organic extractant and washings
SWith Δ V
WWork output as Fuzzy control system.The fuzzy domain of side-play amount e is defined as { x
0, the fuzzy domain of the variable quantity e ' of side-play amount is { y
0, the output increment Δ V of organic extractant
SOutput increment Δ V with washings
WFuzzy domain be defined as { z
0, and fuzzy input, work output domain all be taken as 6 ,-5 ,-4 ,-3 ,-2 ,-1,0,1,2,3,4,5,6}.The single-point fuzzy set is adopted in the obfuscation computing, with x}, and y}, { z} represents two inputs and output region of fuzzy controller, be divided into negative big, negative in, negative little, zero, just little, center, honest 7 fuzzy sets, be expressed as { NB, NM, NS, ZO, PS, PM, PB}.The membership function of variable x, y and z is as shown in table 1:
The membership function of table 1 variable x, y and z
Set up knowledge base:
According to the actually operating experience, organic extractant increment Delta V
SFuzzy control rule and washings increment Delta V
WFuzzy control rule shown in table 2 and table 3.
Table 2 organic extractant increment Delta V
SFuzzy control rule
Table 3 washings increment Delta V
WFuzzy control rule
By table 2 and table 3 as can be known, to the control of organic extractant and just opposite to the control of washings, and comprise 49 rules in each table, because x, all be 7 fuzzy the cutting apart of y, and therefore comprised the regular number of maximum possible in this table.All rules are followed successively by among the table 4-3:
R
1: if x is that NB and y is NB, and then z is PB
R
2: if x is that NB and y is NM, and then z is PB
R
3: if x is that NB and y is NS, and then z is PB
……
R
49: if x is that PB and y is PB, and then z is NB
Fuzzy reasoning:
If the fuzzy set of fuzzy input variable x and y is designated as A ' and B ' respectively, then according to the method and the character of fuzzy reasoning, the fuzzy set C ' that can obtain fuzzy work output z is for (suppose and with asking the friendship method, also is with asking and method, synthetic with maximum-minimum method, fuzzy implication is with asking the friendship method):
Wherein, A
i, B
iAnd C
iBe respectively variable x, the fuzzy set of y and z corresponding to i fuzzy rule.
Sharpening calculates:
The present invention adopts method of weighted mean that the fuzzy work output z that is tried to achieve is carried out sharpening and calculates, and can obtain its clear value z
0Organic extractant increment Delta V as shown in table 4
SFuzzy control table and the washings increment Delta V shown in the table 5
WFuzzy control table.
Table 4 organic extractant increment Delta V
SFuzzy control table
Table 5 washings increment Delta V
WFuzzy control table
According to the side-play amount and the variable quantity thereof of detected rare earth ion characteristic color band, question blank 4 and table 5 can draw organic extractant flow increment and washings flow increment respectively.For example question blank 4 as can be known, when rare earth ion characteristic color band side-play amount e=-3 and variable quantity e '=-1 thereof, organic extractant increment Delta V
SBe 4.5L/min; Washings increment Delta V
WFor-4.5L/min.
The present invention's beneficial effect compared with the prior art is: the extraction system that has characteristic color at rare earth ion, the present invention proposes a kind ofly to detect based on ion characteristic color information, adopt digital image processing techniques and mode identification method, determine that the ion characteristic color band departs from the progression of optimum regime, thereby determine each component method that content distribution changes in the extraction cell body.Compare with traditional on-line analysis technology, present method is more directly perceived, rapid, and is not subjected to restrictions such as place, environment, has advantages such as simple and practical, disposable less investment.
A kind of extraction process control method that the present invention proposes based on ion characteristic color identification; Depart from the progression of optimum regime with the ion characteristic color band and import, adjust processing parameters such as extraction agent, washings flow automatically, make extraction process return to optimum regime rapidly, avoided the blindness of regulating by rule of thumb as intelligent controller.
The present invention is applicable to that rare earth ion has the automatic control and the optimization operation of the extraction separation production process of characteristic color.
Description of drawings
Fig. 1 is that rare earth ion characteristic color Tape movement is differentiated schema;
Fig. 2 is the structured flowchart of fuzzy controller;
Fig. 3 is a rare earth characteristic color band image under the normal extraction process condition;
The rare earth characteristic color band image that Fig. 4 collected for a certain moment;
Fig. 5 is for certain moment ion characteristic color band and depart from normal ion characteristic color band comparison diagram;
Fig. 6 is the change curve of component concentration and output
Fig. 7 is the change curve of characteristic color band skew progression and output
Embodiment
The present invention implements in certain Rare Earth Company, and the said firm carries out cascade extraction to CePr/Nd and separates, the awkward collection of CePr component, and Nd is easy collection component.Whole extracting and separating production line is by 36 grades of extraction sections, and 45 grades of washing sections and 10 grades of stripping sections be totally 91 grades of compositions.According to the on-the-spot technology controlling and process requirement of production process, select the rare earth ion characteristic color to change the fastest the 23rd grade, with and front and back each 6 grades (totally 13 grades) as the video monitoring point.Image capture device is selected Nikon D60 camera for use, and the water of each monitoring point respectively with the shooting of taking a sample of 500ml transparent glass beaker, is carried out cutting and arrangement to image then.Rare earth characteristic color band side-play amount is differentiated the result and is differentiated shown in the figure as the characteristic color of Fig. 3, Fig. 4 and Fig. 5, the rare earth characteristic color band image that Fig. 3 collected for a certain moment, the rare earth characteristic color band image that Fig. 4 collected for a certain moment, Fig. 5 is for certain moment ion characteristic color band and depart from normal ion characteristic color band relatively.
Wherein, the relative error of Fig. 5 is the relative error of the 23rd grade of image among images at different levels and Fig. 3 among Fig. 4.Also show among the figure, carve at a time in the image collect, the 23rd grade of image relative error minimum under the 21st grade of image and the normal extraction process condition draws the characteristic color band and moved forward 2 grades so can differentiate, with this input as fuzzy controller.According to rare earth extraction process material balance, and, obtain the polyteny model that component content soft is measured, be expressed as follows in conjunction with the multi-model modeling principle:
Y in the formula (z) is a component concentration per-cent, and Δ u (z) is the increment of extraction agent.Utilize the model shown in the formula (3) to carry out emulation, its result as shown in Figure 6 and Figure 7, Fig. 6 is the change curve of component concentration and output; Fig. 7 is the change curve of characteristic color band skew progression and output.
As can be seen, after extraction process changed, rare earth ion characteristic color band had moved forward 2 grades from Fig. 6 and Fig. 7, and promptly the Pr component concentration becomes 50% by 60% under the normal extraction process.Utilize fuzzy reasoning that extraction agent is carried out increment control, component concentration and characteristic color band can return to the state under the normal extraction process preferably.Thereby guaranteed the purity requirement of component concentrations at different levels, visible control method of the present invention is effective.
Claims (2)
1. one kind based on the automatic extraction process control method of identification of rare earth ion characteristic color, it is characterized in that, have the extracting and separating system of characteristic color at rare earth ion, determine the side-play amount of the relative optimum position of extraction cell body middle-weight rare earths ion characteristic color band by real-time collection rare earth extraction process intermediate ion characteristic color information, application image treatment technology and mode identification method; Adopt the extraction process control method of Intelligent Control Theory and technology foundation based on rare earth ion characteristic color band side-play amount; Obtain the rare-earth extraction separating process optimization control parameter, thereby realize automatic control the rare earth extraction sepn process.
2. the extraction process control method of discerning automatically based on the rare earth ion characteristic color according to claim 1 is characterized in that described method steps is:
(1) with several cell bodies of front and back at ion characteristic color variable gradient maximum value place as the video monitoring point, in case extraction process changes, corresponding moving also taken place in the color of cell body, be located under the normal extraction process condition, ion characteristic color variable gradient maximum value is at J level cell body, and each n cell body before and after this J level cell body as the video monitoring point, can arrange according to cell body level preface and have 2n+1 video monitoring point, i.e. J-n, J-1, J, J+1, J+n utilizes digital image processing techniques that the graphic information that collects from 2n+1 video monitoring point is differentiated, and obtains the progression that the characteristic color band moves forward and backward;
(2) use for reference technology expertise and skilled operator's experience, adopt the control method of rare earth extraction process of fuzzy control method foundation, obtain little with the quality product fluctuation, as to satisfy direct yield constraint condition optimal processing parameter based on dissimilar characteristic color information; As the changes delta e that the first step detected the rare earth ion characteristic color band side-play amount e obtain and side-play amount thereof input, the increment Delta V of extraction agent and washings flow as controller
SWith Δ V
WOutput as controller; The fuzzy controller Rule Design is as follows:
IF (reach of rare earth color belt), THEN (reduces washing amount V
W);
IF (reach of rare earth color belt), THEN (increases organic extraction amount V
S);
IF (rare earth color tape backspacing), THEN (increases washing amount V
W);
IF (rare earth color tape backspacing), THEN (reduces organic extraction amount V
S);
According to above-mentioned fuzzy control rule, carry out fuzzy logic inference, provide the optimum control amount of extraction agent or washings at last.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514963A (en) * | 2011-11-23 | 2012-06-27 | 上海电力学院 | Correcting control method with function of automatically identifying colors |
| CN106354017A (en) * | 2016-11-14 | 2017-01-25 | 华东交通大学 | Method for controlling content ranges of components in rare earth extraction and separation process |
| CN113377075A (en) * | 2021-07-01 | 2021-09-10 | 中国科学院过程工程研究所 | Method and device for optimizing rare earth extraction process in real time and computer readable storage medium |
| CN113742920A (en) * | 2021-09-06 | 2021-12-03 | 中国恩菲工程技术有限公司 | Extraction model creating method, extraction model determining system, extraction model establishing equipment and storage medium |
-
2010
- 2010-04-27 CN CN201010157160A patent/CN101812589A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514963A (en) * | 2011-11-23 | 2012-06-27 | 上海电力学院 | Correcting control method with function of automatically identifying colors |
| CN106354017A (en) * | 2016-11-14 | 2017-01-25 | 华东交通大学 | Method for controlling content ranges of components in rare earth extraction and separation process |
| CN106354017B (en) * | 2016-11-14 | 2019-06-04 | 华东交通大学 | A kind of Rare Earths Countercurrent Extraction Process constituent content range restraint method |
| CN113377075A (en) * | 2021-07-01 | 2021-09-10 | 中国科学院过程工程研究所 | Method and device for optimizing rare earth extraction process in real time and computer readable storage medium |
| CN113377075B (en) * | 2021-07-01 | 2024-02-09 | 中国科学院过程工程研究所 | Method and device for real-time optimization of rare earth extraction process and computer readable storage medium |
| CN113742920A (en) * | 2021-09-06 | 2021-12-03 | 中国恩菲工程技术有限公司 | Extraction model creating method, extraction model determining system, extraction model establishing equipment and storage medium |
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Application publication date: 20100825 |