CN105603467A - Hysteretic pH value control device and control method - Google Patents
Hysteretic pH value control device and control method Download PDFInfo
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- CN105603467A CN105603467A CN201610092695.XA CN201610092695A CN105603467A CN 105603467 A CN105603467 A CN 105603467A CN 201610092695 A CN201610092695 A CN 201610092695A CN 105603467 A CN105603467 A CN 105603467A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
- C25C7/06—Operating or servicing
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/06—Electrolytic production, recovery or refining of metals by electrolysis of solutions or iron group metals, refractory metals or manganese
- C25C1/08—Electrolytic production, recovery or refining of metals by electrolysis of solutions or iron group metals, refractory metals or manganese of nickel or cobalt
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
- G05D21/02—Control of chemical or physico-chemical variables, e.g. pH value characterised by the use of electric means
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- Chemical Kinetics & Catalysis (AREA)
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
The invention discloses a hysteretic pH value control device and a control method. The control device comprises a reaction kettle, a liquidometer is arranged in the reaction kettle, a reaction liquid input pipeline and an acid liquor adding pipeline are arranged at the top of the reaction kettle, the acid liquor adding pipeline is connected with an acid liquor header tank, a solution output pipeline is arranged at the bottom of the reaction kettle, an acid liquor flow regulating valve is arranged on the acid liquor adding pipeline, a pH value meter is arranged at the tail end of the solution output pipeline, and the pH value meter, the acid liquor flow regulating valve and the liquidometer are connected with a PLC. The problem that in the production process of a copper removal agent, due to fluctuation of the pipeline flow, insufficient partial solution mixing in the reaction kettle and a dynamic system, pH value control is hysteretic is solved, the flow of added acid liquor can be accurately controlled according to liquid level changes in the reaction kettle, and the purpose of accurately controlling the pH value of the reaction solution is achieved.
Description
Technical field
The invention belongs to nickel electrowinning production technical field, be specifically related to a kind of hysteresis quality pH control device and control method.
Background technology
In the production process of nickel electrowinning, nickel electrolyte need to carry out copper removal processing, and the pH due to system plays conclusive impact to the effect of reaction in copper-stripping reaction process, so require the pH value of system to maintain constant level, therefore need the pH of nickel electrolyte accurately to control before copper-stripping reaction is carried out. To cross the pH value of Cheng Qian higher entering copper-stripping reaction for nickel electrolyte, generally adopts sulfuric acid to regulate pH. In actual production technique, be subject on the one hand the impact of one filter progress, entering the nickel electrolyte flow that copper-stripping reaction crosses Cheng Qian pH adjusting reactor is not stationary value, and liquid outlet quantity is steady state value, the variation of system flow makes the adjusting of pH have hysteresis quality, and this has increased the control difficulty of pH; The production of pH adjusting reactor is a continuous process on the other hand, has fluid except pH regulates reactor in feed liquor, and the volume ratio of pH adjusting reactor is larger, and the hysteresis quality of reaction system is larger, has further increased the control difficulty of pH. For these reasons, the pH that enters copper-stripping reaction liquid is difficult to be controlled at desired steady state value. Regulate the flow of the nickel electrolyte of reactor to diminish gradually owing to entering pH, therefore, have not full packages phenomenon for delivery of the pipeline of nickel electrolyte, flowmeter error in dipping in full packages situation is not larger, and this makes the mode being difficult to by calculating nickel electrolyte flow determine sulphuric acid. Current method of operating is directly associated with sulfuric acid adjusting control valve by pH meter, set value the valve opening that regulates sulfuric acid to add by pH, and then control sulphuric acid, but this method is difficult to solve the problem of pH adjusting control hysteresis, and the pH value of copper-stripping reaction liquid still can not reach accurate control.
Summary of the invention
The object of the invention is in order to solve technical problem of the prior art, provide a kind of can realization according to the variation of liquid level in reactor accurately to control the flow that acid solution is added, accurately control the hysteresis quality pH control device of reacting solution pH value.
Another object of the present invention is the control method for a kind of hysteresis quality pH control device is provided.
In order to achieve the above object, the present invention is by the following technical solutions: a kind of hysteresis quality pH control device, comprise reactor, in described reactor, be provided with liquid level gauge, the top of described reactor is provided with reactant liquor input channel and acid solution is added pipeline, described acid solution is added pipeline and is connected with acid solution head tank, described reactor bottom is provided with solution output channel, described acid solution is added pipeline and is provided with acid solution flow control valve, the end of described solution output channel is provided with pH meter, and described pH meter, acid solution flow control valve, liquid level gauge are connected with PLC.
Further, described reactant liquor input channel is provided with reactant liquor input stop valve.
Further, described solution output channel is provided with solution output stop valve.
Further, described liquid level is counted radar level gauge.
A control method for hysteresis quality pH control device, comprises the following steps:
Again, while going into operation after A, for the first time production or maintenance, in PLC, set gradually in advance concentration, the concentration of reactant liquor and the pH value of flow, solution output channel flow and target solution of acid solution;
The acid solution of B, reactant liquor and acid solution head tank is added pipeline by reactant liquor input channel and acid solution respectively and is entered in reactor, and reactant liquor and acid solution flow out by solution output channel after reacting in reactor, and pH meter feeds back in PLC during by the fructufy of detection;
The desired value that C, PLC set according to pH meter is adjusted the valve opening of acid solution flow control valve, until the measured value of pH meter feedback finishes adjusting while equating with the desired value of setting, now acid solution flow control valve initial opening is maintained certain value, switches to normal production process;
D, while normally producing, liquid level gauge feeds back to the liquid level information in reactor in PLC, PLC calculates liquid level result of variations, when entering amount of solution in reactor while being greater than liquid outlet quantity, liquid level changing value △ L be on the occasion of, when entering amount of solution in reactor while equating with liquid outlet quantity, △ L is zero, when entering amount of solution in reactor while being less than liquid outlet quantity, △ L is negative value, PLC finds out the valve opening of acid solution flow control valve and the relation of liquid level changing value △ L by adjusting, and by the controlled formula of PLC matching;
E, PLC calculate the valve opening of acid solution flow control valve according to dominated formulate, and constantly automatically control acid solution flow control valve and be adjusted to corresponding aperture.
The relative prior art of the present invention has following beneficial effect: the present invention changes to regulate the addition of acid solution according to solution level in reactor, can overcome the hysteresis quality impact that pH regulates, acid solution addition is by acid solution Flux Valve Control, the valve opening of acid solution flow control valve and liquid level variation are associated, and set up ratio corresponding relation, pH meter presets the pH value that needs control, again while going into operation after first production or maintenance, it is constant that reactor feed liquor and liquid outlet quantity all maintain, PLC adjusts the aperture of acid solution flow control valve according to the setting value of pH meter, until pH measured value is consistent with setting value result, now the valve opening of acid solution flow control valve is maintained certain value MV0, now switch to normal production process, when normal production, due to the impact of upper track filter progress, the reactant liquor flow that enters reactor can diminish gradually, this can cause liquid level in reactor to change, in control, liquid level changing value is decided to be to △ L, when entering the amount of solution of reactor while being greater than liquid outlet quantity, △ L be on the occasion of, in the time that the amount of solution that enters reactor equates with liquid outlet quantity, △ L is zero, when entering the amount of solution of reactor while being less than liquid outlet quantity, △ L is negative value, PLC finds out the valve opening of acid solution flow control valve and the relation of △ L by adjusting, and then at former valve opening MV0Basis on increase accordingly, constant or reduce, finally guarantee that pH value stabilization is controlled at setting value. The problem of the invention solves in the production process of decoppering agent in the fluctuation due to pipeline flow, reactor that topical solutions is mixed insufficient and the pH control hysteresis that causes for dynamical system, reaches the object of accurate control reacting solution pH value.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Reference numeral implication of the present invention is as follows: 1, acid solution head tank; 2, acid solution flow control valve; 3, reactant liquor input stop valve; 4, reactor; 5, liquid level gauge; 6, PLC; 7, solution output stop valve; 8, pH meter; 9, reactant liquor input channel; 10, acid solution is added pipeline; 11, solution output channel.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, a kind of hysteresis quality pH control device, comprise reactor 4, in reactor 4, be provided with liquid level gauge 5, liquid level gauge 5 is radar level gauge, for detection of the interior liquid level of reactor 4, the top of reactor 4 is provided with reactant liquor input channel 9 and acid solution is added pipeline 10, reactant liquor input channel 9 is provided with reactant liquor input stop valve 3, off-response liquid input channel 9 while being used for safeguarding, acid solution is added pipeline 10 and is connected with the acid solution head tank 1 that stores acid solution, reactor 4 bottoms are provided with solution output channel 11, solution output channel 11 is provided with solution output stop valve 7, while being used for safeguarding, close solution output channel 11, the end of solution output channel 11 is provided with pH meter 8, for detection of the pH of reactor 4 interior solution, acid solution is added pipeline 10 and is provided with acid solution flow control valve 2, acid solution flow control valve 2, pH meter 8, liquid level gauge 5 is connected with PLC6.
Again, while going into operation after first production or maintenance, in PLC6, set gradually in advance concentration, the concentration of reactant liquor and the pH value of flow, solution output channel flow and target solution of acid solution; The acid solution of reactant liquor and acid solution head tank 1 is added pipeline 10 by reactant liquor input channel 9 and acid solution respectively and is entered in reactor 4, reactant liquor and acid solution flow out by solution output channel 11 afterwards in the interior reaction of reactor 4, and pH meter 8 feeds back in PLC6 during by the fructufy of detection; The desired value that PLC6 sets according to pH meter 8 is adjusted the valve opening of acid solution flow control valve 2, until the measured value that pH meter 8 feeds back finishes while equating with the desired value of setting to regulate, now acid solution flow control valve 2 initial openings are maintained certain value, switch to normal production process; When normal production, liquid level gauge 5 feeds back to the liquid level information in reactor 4 in PLC6, PLC6 calculates liquid level result of variations, when entering amount of solution in reactor 4 while being greater than liquid outlet quantity, liquid level changing value △ L be on the occasion of, when entering amount of solution in reactor 4 while equating with liquid outlet quantity, △ L is zero, when entering amount of solution in reactor 4 while being less than liquid outlet quantity, △ L is negative value, PLC6 finds out the valve opening of acid solution flow control valve 2 and the relation of liquid level changing value △ L by adjusting, and by the controlled formula of PLC6 matching
MV=MV0＋K·△L·100%
MV---acid solution Flow-rate adjustment valve opening (%);
MV0---acid solution flow control valve initial opening
In △ L---the unit interval, reactor liquid level changes (m);
K---coefficient of relationship.
Calculate the valve opening of acid solution flow control valve 2 according to the above-mentioned formula simulating, PLC6 constantly automatically controls acid solution flow control valve 2 and is adjusted to corresponding aperture, and then keep measured value and the setting value of pH meter 8 to be consistent, thereby reach the object of accurate control reactor 4 interior pHs.
Claims (5)
1. a hysteresis quality pH control device, comprise reactor (4), it is characterized in that: in described reactor (4), be provided with liquid level gauge (5), the top of described reactor (4) is provided with reactant liquor input channel (9) and acid solution is added pipeline (10), described acid solution is added pipeline (10) and is connected with acid solution head tank (1), described reactor (4) bottom is provided with solution output channel (11), the end of described solution output channel (11) is provided with pH meter (8), described acid solution is added pipeline (10) and is provided with acid solution flow control valve (2), described acid solution flow control valve (2), pH meter (8), liquid level gauge (5) and PLC(6) be connected.
2. a kind of hysteresis quality pH control device according to claim 1, is characterized in that: described reactant liquor input channel (9) is provided with reactant liquor input stop valve (3).
3. a kind of hysteresis quality pH control device according to claim 1, is characterized in that: described solution output channel (11) is provided with solution output stop valve (7).
4. a kind of hysteresis quality pH control device according to claim 1, is characterized in that: described liquid level gauge (5) is radar level gauge.
5. a control method for hysteresis quality pH control device according to claim 1, is characterized in that comprising the following steps:
A, for the first time produce or maintenance after while again going into operation, at PLC(6) in set gradually in advance concentration, the concentration of reactant liquor and the pH value of flow, solution output channel flow and target solution of acid solution;
The acid solution of B, reactant liquor and acid solution head tank (1) is added pipeline (10) by reactant liquor input channel (9) and acid solution respectively and is entered in reactor (4), reactant liquor and acid solution flow out by solution output channel (11) after reacting in reactor (4), and pH meter (8) feeds back to PLC(6 during by the fructufy of detection) in;
C, PLC(6) according to the desired value of pH meter (8) setting, the valve opening of acid solution flow control valve (2) is adjusted, until the measured value of pH meter (8) feedback finishes adjusting while equating with the desired value of setting, now acid solution flow control valve (2) initial opening is maintained certain value, switches to normal production process;
D, when normal production, the liquid level information in reactor (4) is fed back to PLC(6 by liquid level gauge (5)) in, PLC(6) calculate liquid level result of variations, when entering amount of solution in reactor (4) while being greater than liquid outlet quantity, liquid level changing value △ L be on the occasion of, when entering amount of solution in reactor (4) while equating with liquid outlet quantity, △ L is zero, when entering amount of solution in reactor (4) while being less than liquid outlet quantity, △ L is negative value, PLC(6) find out the valve opening of acid solution flow control valve (2) and the relation of liquid level changing value △ L by adjusting, and by PLC(6) the controlled formula of matching,
E, PLC(6) calculate the valve opening of acid solution flow control valve (2) according to dominated formulate, and constantly automatically control acid solution flow control valve (2) and be adjusted to corresponding aperture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610092695.XA CN105603467A (en) | 2016-02-19 | 2016-02-19 | Hysteretic pH value control device and control method |
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| CN201610092695.XA CN105603467A (en) | 2016-02-19 | 2016-02-19 | Hysteretic pH value control device and control method |
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| CN201610092695.XA Pending CN105603467A (en) | 2016-02-19 | 2016-02-19 | Hysteretic pH value control device and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110162112A (en) * | 2019-06-20 | 2019-08-23 | 湖南正清制药集团股份有限公司 | A kind of pH value regulating device and method for extracting cucoline |
| CN110398992A (en) * | 2019-07-29 | 2019-11-01 | 湖南正清制药集团股份有限公司 | A kind of pH value remote adjustment system and method extracting cucoline |
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| CN102392128A (en) * | 2011-12-11 | 2012-03-28 | 郴州市金贵银业股份有限公司 | Acid adding device with accurate and automatic pH value control function |
| CN202717582U (en) * | 2012-07-24 | 2013-02-06 | 广东广业云硫矿业有限公司 | Sulfuric acid liquid level automatic control system of high-position balance tank |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110162112A (en) * | 2019-06-20 | 2019-08-23 | 湖南正清制药集团股份有限公司 | A kind of pH value regulating device and method for extracting cucoline |
| CN110398992A (en) * | 2019-07-29 | 2019-11-01 | 湖南正清制药集团股份有限公司 | A kind of pH value remote adjustment system and method extracting cucoline |
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Application publication date: 20160525 |
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