CN104674260A - Rapid control method for preventing regenerated waste cold rolled steel pickling acid from crystallization - Google Patents
Rapid control method for preventing regenerated waste cold rolled steel pickling acid from crystallization Download PDFInfo
- Publication number
- CN104674260A CN104674260A CN201510141227.2A CN201510141227A CN104674260A CN 104674260 A CN104674260 A CN 104674260A CN 201510141227 A CN201510141227 A CN 201510141227A CN 104674260 A CN104674260 A CN 104674260A
- Authority
- CN
- China
- Prior art keywords
- acid
- crystallization
- waste acid
- control method
- spent acid
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/36—Regeneration of waste pickling liquors
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a rapid control method for preventing regenerated waste cold rolled steel pickling acid from crystallization. The rapid control method comprises the following four aspects to achieve the purpose of preventing waste acid from crystallization: (1) a filtering net with the aperture of 2 meshes is adopted as a filter used before the waste acid is concentrated, the filtering net is made of PTFE, and the pressure difference of the filter before and after filtration is less than or equal to 1.5Kg/cm<2>; (2) the density of the concentrated waste acid is controlled to be 1.3-1.5g/cm<3>; (3) the temperature of the concentrated waste acid inside a pipeline is controlled to be reduced by less than or equal to 20 DEG C/hour; (4) the flow of the concentrated waste acid inside the pipeline is controlled to be no less than 50% of designed flow. Viewing from analyzing the waste acid crystallization mechanism, four main factors of crystallization are found, and an effect of preventing crystallization is achieved by optimizing the four factors. The rapid control method has the advantages that firstly, the mass of the waste acid can be rapidly judged, the waste acid can be prevented from crystallization, and the problem of waste acid crystallization can be solved; secondly, the faults of an acid regeneration system can be reduced; thirdly, the labor and material consumption of stations can be reduced.
Description
Technical field
The present invention relates to a kind of cold-rolled steel acid-washing waste acid regeneration crystallization-preventive fast control method, belong to metallurgical technology field.
Background technology
Need before steel sheet is cold rolling by chlorohydric acid pickling, to remove the iron scale etc. on cold rolling harmful raw material coil of strip surface.In acid cleaning process, Fe
2+concentration can increase gradually, when it reaches 110 ~ 130g/L, pickle solution just become waste liquid discharge.Acid regeneration recovery is carried out at present mainly through the mode of spray roasting, its idiographic flow is: come from the spent acid of pickling line with being pumped in strainer, cross and filter to remove solid particulate and insolubles, then enter thickener heating concentrated (exchange with thermal bake-out air heat and heat) partially liq to be evaporated form concentrating waste acid (temperature is about 130 ~ 150 DEG C), be then pumped into roasting apparatus and carry out acid regeneration.
In acid regeneration removal process; need to concentrate spent acid; form oversaturated spent acid solution; owing to there is the various internal and external factors such as equipment operation failure, Measuring and testing, misoperation, environmental change; phenomenon is shut down in burst often to cause the acid purification system run often to occur; cause the supersaturation spent acid in gelled acid pipeline not discharge in time, gelled acid pipeline can not be effectively addressed, thus causes pipeline crystallization accident.The intractability of pipeline crystallization is large, and the time is long, and quite general what occur winter especially, crystallization is even more serious.Current treatment process is process substantially afterwards, consumes larger manpower and materials, huge to the impact of producing, and causes huge loss.
Spent acid crystallisation problems is the problem of the most difficult prevention and control of acid purification system, is also the difficult problem that cold rolling industry faces, and how to suppress spent acid crystallization fast, be also the problem of joint exploration in industry.Present regenerating spent acid crystallization prevention method, mainly takes two kinds: one, interval thin up method.This method is exactly in spent acid treating processes, for preventing the crystallization of spent acid, adopting regular thin up or switching water operation, in order to foreign material sharply, dilution spent acid solution in pipe blow-through.This method can reduce operating spent acid crystallization probability, but for the crystallization that causes of stopping accident of burst prevention, disposing capacity is not enough, and causes the decline of spent acid processing efficiency because of frequent thin up, causes the rising of energy consumption cost; Two, period sampling measuring concentration water feeding method.Namely detected the concentration of spent acid iron ion by chemical examination, ensure the concentration requirement of spent acid.This method is from fetching and delivering sample to detection, and the time to the feedback of result is longer, relatively lags behind, can not find within the very first time to spent acid crystallization, prevention and control for judgement and prevention pipeline crystallization, thus also not strong to the prevention dynamics of spent acid crystallization.Therefore, a kind of energy of current searching quick diagnosis spent acid index, effectively the method for prevention spent acid crystallization is extremely urgent.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of cold-rolled steel acid-washing waste acid regeneration crystallization-preventive fast control method.The method solves spent acid crystallisation problems from the mechanism that crystallization produces, and method of controlling operation thereof is novel, simple, quick, effective, effectively can prevent the crystallization of spent acid, avoids the various accidents that generation line clogging causes.
The present invention is studied by the flow process (pickling line → strainer → thickener → reclaim equiment) recycled the regeneration of cold-rolled steel acid-washing waste acid, from the strainer before concentrated, concentrated after the flow etc. of the density of spent acid, spent acid temperature drop in pipeline between thickener to reclaim equiment and concentrating waste acid control, effectively can prevent the crystallization of spent acid.
Technical scheme of the present invention is: a kind of cold-rolled steel acid-washing waste acid regeneration crystallization-preventive fast control method, be is characterized in that, combined the object reaching the crystallization of prevention spent acid by following four aspects:
(1) strainer before waste acid concentration, the aperture of filter screen of employing is 2 orders, and material is PTFE (tetrafluoroethylene), pressure reduction≤1.5Kg/cm before and after controlling filter
2(1.5 × 10
5pa); Before and after strainer, pressure reduction is greater than 1.5Kg/cm
2(1.5 × 10
5pa), need to start switching, wash procedure, switch or cleaned filter screen;
(2) controlling the spent acid density after concentrating is 1.3 ~ 1.5g/cm
3; Concrete operations: get spent acid, directly insert densometer, and according to read density values, judge whether to need to regulate acid-spending strength, density is lower than 1.3g/cm
3, can concentrating waste acid be continued; Density is higher than 1.5g/cm
3, can add water (or rinse water) dilute or switch to water to operate, until density meets the requirements acid operation;
(3) control concentrated in pipeline after the temperature drop≤20 DEG C/h of spent acid: concrete operations are as follows: the temperature drop utilizing Portable thermometer or in situ temperature meter testing pipes liquid, by opening pipeline tracing in time, guarantee the spent acid temperature in pipeline, guarantee spent acid temperature drop≤20 DEG C/h; Especially, after spent acid stops flowing in pipeline, more to accompany heat in time, prevent unexpected decrease temperature crystalline;
(4) control concentrated in pipeline after spent acid flow be not less than design discharge 50%, flow lower than design discharge 50% time, need acid operation to switch to water to operate (namely with water flushing pipe), and check cleaned filter.
Innovative point of the present invention is:
(1) innovation that the present invention is maximum adopts density to diagnose spent acid, directly adopts densometer to measure; Compare existing employing concentration to diagnose, there is quick, simple effect;
(2) effect of the strainer before concentrating filters to remove solid particulate and insolubles, aperture of filter screen 2 order of the strainer that the present invention adopts, and material is PTFE, and pressure reduction≤1.5Kg/cm before and after controlling filter
2, in order to Ex-all insoluble particle as much as possible, prevent insoluble particle from forming the nucleus of condensation, and then cohesion forms crystallization;
(3) control temperature drop 20 DEG C/h, prevent from lowering the temperature suddenly the spent acid crystallization caused;
(4) if the particulate matter on tube wall increases (metre filter weak effect, or for a long time do not clear up pipeline cause), caliber can be caused to attenuate and increase the frictional force of pipeline, thus greatly reducing the flow of spent acid; When spent acid flow is less than 50% of design, clears up pipeline in time, change strainer, in order to avoid tube wall particulate matter is many, forms the more nucleus of condensation and condense crystallization.
Beneficial effect of the present invention: the present invention sets about from the mechanism analyzing spent acid crystallization generation, finding the 4 large key elements producing crystallization, by being optimized control to 4 key elements, playing the effect of pre-crystallization-preventive.The method has following advantage: (1) judges spent acid quality fast, and the crystallization of prevention spent acid, solves spent acid crystallisation problems; (2) acid purification system fault is reduced; (3) consumption of post manpower and materials is reduced.
Embodiment
Embodiment 1:
The object reaching the crystallization of prevention spent acid is combined by following four aspects:
(1) strainer before waste acid concentration, the aperture of filter screen of employing is 2 orders, and material is PTFE (tetrafluoroethylene), pressure reduction≤1.5Kg/cm before and after strainer
2(1.5 × 10
5pa), before and after strainer, pressure reduction is greater than 1.5Kg/cm
2(1.5 × 10
5pa), need to start switching, wash procedure, switch or cleaned filter screen;
(2) controlling the spent acid density after concentrating is 1.3 ~ 1.5g/cm
3; Concrete operations: get spent acid, directly insert densometer, and according to read density values, judge whether to need to regulate acid-spending strength, density is lower than 1.3g/cm
3, can concentrating waste acid be continued; Density is higher than 1.5g/cm
3, can add water (or rinse water) dilute or switch to water to operate, until density meets the requirements acid operation;
(3) control concentrated in pipeline after the temperature drop≤20 DEG C/h of spent acid: concrete operations are as follows: the temperature drop utilizing Portable thermometer or in situ temperature meter testing pipes liquid, by opening pipeline tracing in time, guarantee the spent acid temperature in pipeline, guarantee that spent acid temperature drop is lower than 20 DEG C/h; Especially, after spent acid stops flowing in pipeline, more to accompany heat in time, prevent unexpected decrease temperature crystalline;
(4) spent acid each section of flow is monitored, control concentrated in pipeline after spent acid flow be not less than design discharge 50%, flow lower than design discharge 50% time, need acid operation to switch to water to operate, and check cleaned filter.Such as caliber is the pipeline of DN55, and its design discharge is 7.5 cubic meters/hour, then controlling spent acid flow is >=3.75 cubic meters/hour.
Be combined by above-mentioned four kinds of modes, try half a year in Shandong Iron & Steel Co., Ltd. inside, nodeless mesh accident occurs, thus reduces acid purification system fault, reduces the consumption of post manpower and materials.
Claims (4)
1. a cold-rolled steel acid-washing waste acid regeneration crystallization-preventive fast control method, is characterized in that, is combined the object reaching the crystallization of prevention spent acid by following four aspects:
(1) strainer before waste acid concentration, the aperture of filter screen of employing is 2 orders, and material is tetrafluoroethylene, pressure reduction≤1.5Kg/cm before and after controlling filter
2;
(2) controlling the spent acid density after concentrating is 1.3 ~ 1.5g/cm
3; Concrete operations: get spent acid, directly insert densometer, according to read density values, judge whether to need to regulate acid-spending strength;
(3) control concentrated in pipeline after the temperature drop≤20 DEG C/h of spent acid: concrete operations are as follows: the temperature drop utilizing Portable thermometer or in situ temperature meter testing pipes liquid, by opening pipeline tracing in time, guarantee the spent acid temperature in pipeline, guarantee spent acid temperature drop≤20 DEG C/h;
(4) controlling the spent acid flow after concentrating in pipeline is be not less than design discharge 50%.
2. a kind of cold-rolled steel acid-washing waste acid regeneration crystallization-preventive fast control method as claimed in claim 1, it is characterized in that, described step (1) pressure reduction before and after strainer is greater than 1.5Kg/cm
2, switch or cleaned filter screen.
3. a kind of cold-rolled steel acid-washing waste acid regeneration crystallization-preventive fast control method as claimed in claim 1, it is characterized in that, described step (2) density is lower than 1.3g/cm
3, continue concentrating waste acid; Density is higher than 1.5g/cm
3, thin up, until density meets the requirements.
4. a kind of cold-rolled steel acid-washing waste acid regeneration crystallization-preventive fast control method as claimed in claim 1, is characterized in that, described step (4) flow lower than design discharge 50% time, with water flushing pipe, and check cleaned filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510141227.2A CN104674260B (en) | 2015-03-30 | 2015-03-30 | A kind of cold-rolled steel acid-washing waste acid regenerates crystallization-preventive fast control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510141227.2A CN104674260B (en) | 2015-03-30 | 2015-03-30 | A kind of cold-rolled steel acid-washing waste acid regenerates crystallization-preventive fast control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104674260A true CN104674260A (en) | 2015-06-03 |
| CN104674260B CN104674260B (en) | 2017-03-01 |
Family
ID=53309825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510141227.2A Expired - Fee Related CN104674260B (en) | 2015-03-30 | 2015-03-30 | A kind of cold-rolled steel acid-washing waste acid regenerates crystallization-preventive fast control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104674260B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002241977A (en) * | 2001-02-15 | 2002-08-28 | Kawasaki Steel Corp | Acid recovery facilities and method for preventing clogging of piping in the acid recovery facilities |
| CN103382558A (en) * | 2013-07-03 | 2013-11-06 | 首钢总公司 | Method used for reducing acid regenerating venture rear negative pressure |
| CN104047009A (en) * | 2014-06-28 | 2014-09-17 | 南通久信石墨科技开发有限公司 | Recovery process device of ferrous chloride in steel pickling liquid |
| CN104250820A (en) * | 2013-06-27 | 2014-12-31 | 宝钢不锈钢有限公司 | Method and apparatus for regenerating all acid of stainless steel pickling waste liquid |
-
2015
- 2015-03-30 CN CN201510141227.2A patent/CN104674260B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002241977A (en) * | 2001-02-15 | 2002-08-28 | Kawasaki Steel Corp | Acid recovery facilities and method for preventing clogging of piping in the acid recovery facilities |
| CN104250820A (en) * | 2013-06-27 | 2014-12-31 | 宝钢不锈钢有限公司 | Method and apparatus for regenerating all acid of stainless steel pickling waste liquid |
| CN103382558A (en) * | 2013-07-03 | 2013-11-06 | 首钢总公司 | Method used for reducing acid regenerating venture rear negative pressure |
| CN104047009A (en) * | 2014-06-28 | 2014-09-17 | 南通久信石墨科技开发有限公司 | Recovery process device of ferrous chloride in steel pickling liquid |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104674260B (en) | 2017-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207659125U (en) | A kind of steel-making cooling water purification recovery device | |
| CN203842388U (en) | Air conditioner surface air cooler circulating water pipeline filter device | |
| CN103265131B (en) | System and method for fine treatment of condensation water | |
| CN201206108Y (en) | Electro-adsorption desalination system for sewage advanced treatment | |
| CN101109088A (en) | Technique for cleaning acid dirty of acid reactivating machine group inner loop type pipeline | |
| CN106310755B (en) | Acid regeneration system, cleaning system, acid regeneration method and cleaning method thereof | |
| CN104180470A (en) | Cleaning reminding method and cleaning reminding device for air conditioner filtering device | |
| KR101207649B1 (en) | Apparatus for removing tar of pipe | |
| CN104674260A (en) | Rapid control method for preventing regenerated waste cold rolled steel pickling acid from crystallization | |
| CN106630226A (en) | Plumbic acid storage battery waste acid recovering system and residual liquid treatment method | |
| CN204008254U (en) | High moisture dust-laden gas analysis sample gas pretreating system | |
| CN204151495U (en) | Rinsing bowl CS in a kind of viscose staple fibre production 2recovery system | |
| CN203389417U (en) | Novel Y-shaped filter | |
| CN105479339A (en) | Device for automatically controlling grinding temperature of stainless steel | |
| CN209065978U (en) | Device for removing calcium and magnesium ions in zinc hydrometallurgy process | |
| CN104259156B (en) | Stoving oven supply lines automatic cleaning system and purging method | |
| CN210097944U (en) | Power plant boiler steam blowpipe zero resistance particle collector | |
| CN203758796U (en) | Flue gas denitrification sampling device and analytic system | |
| CN203598563U (en) | Multiunit brine filter device | |
| CN208933164U (en) | A kind of agent for carbon hydrogen detergent recyclable device | |
| CN216677255U (en) | Acid liquor filtering and backwashing device of acid analyzer | |
| CN216786223U (en) | Protective nitric acid cleaning device | |
| CN203355357U (en) | Waste acid purification and recovery equipment | |
| CN203903990U (en) | Improved device for analyzing pure sulfuric acid through distillation method | |
| CN219647178U (en) | Waste acid purifying system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170301 Termination date: 20190330 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |