CN103898525A - Method for removing scale of rolled steel - Google Patents
Method for removing scale of rolled steel Download PDFInfo
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- CN103898525A CN103898525A CN201210585842.9A CN201210585842A CN103898525A CN 103898525 A CN103898525 A CN 103898525A CN 201210585842 A CN201210585842 A CN 201210585842A CN 103898525 A CN103898525 A CN 103898525A
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- steel
- scale
- aqueous solution
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- reagent treatment
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Abstract
The invention discloses a method for removing a scale of rolled steel. The method comprises the step: performing at least two times of scale removing treatment on the rolled steel containing the scale on the surface, wherein the scale removing treatment is composed of a step (a) and a step (b), in the step (a), the rolled steel is placed in a treatment reagent, and the scale is loosened from the surface of the rolled steel without separating from the rolled steel by using a chemical impregnation method or chemical electrolysis method; and in the step (b), the rolled steel is removed out from the treatment reagent, and the loosened scale is separated from the surface of the rolled steel by using a mechanical method. According to the method, through the step (a) and the step (b), at least two times of scale removing treatment are performed, the scale can be completely removed from the surface of the rolled steel.
Description
Technical field
The present invention relates to a kind of method of the scale of removing steel, refer to especially the method for the scale of the removal steel in a kind of work-ing life that extends reagent treatment.
Background technology
Included annealing, quenching, welding, forging and the heat treatment process of production process of steel, can make steel surface produce the oxidizing substance of the less desirable black of one deck, is general alleged " scale ".The existence of scale not only affects steel surface quality, can produce detrimentally affect to follow-up processing effect and final product quality simultaneously, therefore must remove.
At present, as the steel such as carbon steel, stainless steel and high quality steel, adopt acid washing method to remove scale, utilize acid that the scale of stainless steel surface is dissolved, scale is separated with steel.Concrete way is under 60 to 75 ℃ of environment, with nitric acid (HNO
3) and the mixture of hydrofluoric acid (HF) as pickle solution, carry out pickling 15 to 30 minutes.
But the contained hydrofluoric acid of pickle solution is tubing products, after pickling, scale falls into pickle solution and dissolves gradually, and pickle solution must be changed because of heavy metal ion such as the iron, chromium and the nickel that contain high density.Spent pickle liquor need carry out special processing by removal of heavy metal ions, even but spent pickle liquor after treatment still cannot re-use; To adopt acid-base neutralisation method to make the sludge settling of metal ion in spent pickle liquor at present, separates and solidify be dried after again to bury method processing, but the region that can Gong bury is limited, and certainly will cause soil pollution.
In addition, in use procedure, can produce oxynitride (NO containing the pickle solution of nitric acid
x), as nitrogen protoxide (NO) and nitrogen peroxide (NO
2).Although add as hydrogen peroxide (H in pickle solution
2o
2) etc. oxygenant contribute to reduce the usage quantity of nitric acid and reduce oxynitride and generate, but still cannot solve the pollution problem that spent pickle liquor causes.
From the above, pickle solution itself and waste liquid thereof all cause great harm to environment and HUMAN HEALTH, therefore, should, with environment-friendly and green technology as target, develop a kind of method of the removal scale that reduces pickle solution usage quantity.
Summary of the invention
The object of the present invention is to provide a kind of method of the scale of removing steel.The present invention removes the method for the scale of steel, comprises: make steel that scale is contained on a surface carry out at least twice processing of rust removing, this processing of rust removing is made up of step (a) and step (b):
Step (a): these steel are placed in to a reagent treatment, and utilize method of chemical immersion or chemical electrolysis method, make this scale become flexible but not depart from these steel from this steel surface; And
Step (b): these steel are shifted out in this reagent treatment, utilize mechanical means, the scale having become flexible is departed from from this steel surface.
Beneficial effect of the present invention is: by step (a) and step (b), the scale of steel surface is removed, and step (a) can not make this scale fall into or be dissolved in this reagent treatment, therefore can extend the work-ing life of this reagent treatment, really reduce the consumption of reagent treatment.
Embodiment
The present invention removes the method for the scale of steel, comprises: make steel that scale is contained on a surface carry out at least twice processing of rust removing, this processing of rust removing is made up of step (a) and step (b):
Step (a): these steel are placed in to a reagent treatment, and utilize method of chemical immersion or chemical electrolysis method, make this scale become flexible but not depart from these steel from this steel surface; And
Step (b): these steel are shifted out in this reagent treatment, utilize mechanical means, the scale having become flexible is departed from from this steel surface.
When step (a) this scale structure is damaged and produce perforation or crack etc. damaged, this reagent treatment can be infiltrated in this scale tissue and scale effect, even penetrate scale and scale below minute quantity steel local and scale adjacency and react, and make scale become flexible but not depart from these steel from this steel surface.
The mechanical rust removal of step (b) is not limited to any method or equipment, as long as can provide direct contact or the mechanical force of the scale that become flexible by this steel surface of medium contact is all suitable for.Preferably, this mechanical force is brushing or grinding.
Prior art was once enabled ultrasound and was removed the way of scale when steel react with this reagent treatment, but this measure meeting comes off scale and be dissolved in gradually in reagent treatment, caused the concentration of metal ions of this reagent treatment to improve, and cannot re-use.Mechanical treatment of the present invention is not in reagent treatment, but in isolated area, scale is come off from steel surface, pollutes this reagent treatment to avoid scale to come off, and extends the work-ing life of this reagent treatment simultaneously.
Due to the composition of steel itself and create conditions and can cause composition, the structure of scale, and the bonding strength of scale and steel differs widely, the steel that the inventive method effects on surface contains scale carry out the number of times of processing of rust removing and treatment condition need be depending on the kind of these steel, create conditions and the difference of scale situation and adjusting, to prevent causing the consume of this steel because excessively carrying out processing of rust removing, and reach thoroughly scale is removed and is not damaged these steel ideal effect.
In addition, become flexible but do not depart from these steel from this steel surface because step (a) makes scale, so the present invention can't cause because repeating processing of rust removing the concentration of metal ions in this reagent treatment to improve, this reagent treatment is through repeatedly being used the effect still can with good loosening scale; Therefore, proposed steps (a) is reused this reagent treatment, does not need each replacing, will contribute to reduce significantly the consumption of reagent treatment, promotes rust cleaning efficiency cost-saving.
Preferably, these steel are to be selected from carbon steel, stainless steel or high quality steel.
Although the main component of the scale of steel surface is ferric oxide, if only eliminate rust by mechanical rust removal mode, scale can be removed most of, but rust root (scale root) cannot be removed completely, therefore generally adopt acid washing method processing, but easily cause the situation of over-pickling to occur.The scale composition of stainless steel surface comprises NIO
2, Cr
2o
3, FeOCr
2o
3, FeOCr
2o
33Fe
2o
3isopyknic spinel oxides, is combined quite firmly with steel, the method that is applicable to carbon steel rust cleaning cannot be removed stainless steel scale; And high quality steel contains more a high proportion of nickel and chromium element, the combination between its scale and steel is more tight.But, after at least twice processing of rust removing of above-mentioned steel via the inventive method, all can, by using a small amount of reagent treatment, scale effectively be removed.
Preferably, this chemical electrolysis method is the electrically conducting manner that is selected from direct these steel of contact, or the pole-changing mode of these steel of non-direct contact.
Preferably, this reagent treatment comprises an aqueous solution, this aqueous solution is to be selected from aqueous sulfuric acid, aqueous sodium persulfate solution, sodium phosphate aqueous solution, trisodium phosphate aqueous solution, sodium chloride aqueous solution, chloric acid aqueous solution, ammonium sulfate solution, and ammonium phosphate solution.The selected aqueous solution of the present invention does not comprise nitric acid and hydrofluoric acid, can not produce the nitrogen-containing oxide that causes work safety and environmental issue.
Again preferably, this aqueous solution is to be selected from aqueous sodium persulfate solution, sodium phosphate aqueous solution, trisodium phosphate aqueous solution, sodium chloride aqueous solution, chloric acid aqueous solution, ammonium sulfate solution, and ammonium phosphate solution.Owing to may there being the material such as grease or lubricant to be attached to steel surface in the steel course of processing, impact rust cleaning effect, causes scale to be difficult to remove and even cannot remove completely.Aforementioned aqueous solution has the effect of clean this steel surface, contributes to the grease or the lubricant that are attached to steel surface to remove, and the effect that makes to eliminate rust is even more ideal.
Preferably, this aqueous solution is to be selected from 0.5 to 10M aqueous sulfuric acid, 0.1 to 2M aqueous sodium persulfate solution, 0.1 to 2M sodium phosphate aqueous solution, 0.1 to 2M trisodium phosphate aqueous solution, 0.1 to 5M sodium chloride aqueous solution, 0.1 to 2M chloric acid aqueous solution, and 0.1 to 2M ammonium sulfate solution, and 0.1 to 2M ammonium phosphate solution.Although the upper limit of concentration of this aqueous solution is relevant with the solubleness of the chemical that this aqueous solution comprises, the concentration of working as this aqueous solution is too low, electroconductibility deficiency, and processing efficiency is not good; And excessive concentration cannot make chemical dissolve or have crystallization to produce in the time of low temperature.
The time that these steel is placed in to this reagent treatment need determine according to actual state, in general the time do not need oversize, as long as scale structure has been subject to preliminary destroy and this steel surface is loosening certainly.The present invention, by repeatedly carrying out and the operating parameters of set-up procedure (a) and step (b), makes the aeration level of controlling scale become feasible.If carry out for the first time processing of rust removing, suggestion is carried out step (a) processing selecting and is had the neutral or alkaline reagent treatment of clean steel surface effect simultaneously, and avoids scale excessively loosening, can carry out step (b); If carry out above for the second time or for the second time processing of rust removing, suggestion is carried out reagent treatment that step (a) processes and is selected and be easily penetrated into the person of scale lower floor (specific practice can for example be added interfacial agent, the surface tension of reagent treatment is reduced), but still must avoid scale excessively loosening, then carry out step (b).
Preferably, the treatment time of this method of chemical immersion is 10 to 30 minutes.
Preferably, the treatment time of this chemical electrolysis method is 1 to 120 second, and current density is 10 to 400 amperes per square meter.If current density is too low, scale removal effect is not good; Current density is too high, and electrode will produce too much hydrogen and oxygen, comparatively inconvenience in operation, and cause unnecessary power consumption.
Preferably, the cathode material of this chemical electrolysis method is conductive any metallic substance, or conductive non-metals material (as graphite etc.); Anode material is metallic substance or the conductive non-metals material that surface can not produce insulating oxide, for example oxide compound of lead, graphite, platinum, platinum, or other precious metal families or its oxide compound etc.
Preferably, this step (a) is to carry out at 0 to 90 ℃.This temperature range is to consider this reagent treatment to comprise an aqueous solution, need guarantee that step (a) can carry out in the non-icing situation of this aqueous solution.
Preferably, this reagent treatment also comprises an oxygenant.
More preferably, the concentration of this oxygenant is 0.1 to 2M, be to be selected from hydrogen peroxide, chloric acid, hypochlorous acid, to cross chloric acid, or its esters.
The present invention will be described further with regard to following examples, but will be appreciated that, this embodiment is only for illustrating use, and should not be interpreted as restriction of the invention process.
< chemical and material >
Steel: the stainless steel hot-rolling wire rod that contains scale for surface, purchased from Hua Xin stainless steel company, model " 304J3 ", diameter 6.5mm, scale thickness is 5 μ m.
Brushing material: produced by 3M company, surface is containing powder emery.
< embodiment 1 to 6 and comparative example 1 >
[embodiment 1]
Processing of rust removing
The processing of rust removing of embodiment 1 is sequentially to carry out following 2 processing of rust removing:
Processing of rust removing for the first time
Step (a): the aqueous sodium persulfate solution of preparation 0.5M is as reagent treatment, adopt chemical electrolysis method, the steel that at 30 ℃, scale contained in this surface impregnated in this aqueous sulfuric acid and carry out anode electrolysis 24 seconds, and current density is 50 amperes per square meter.
Step (b): these steel are taken out and remove the unnecessary aqueous sulfuric acid in surface from this reagent treatment, then with this brushing material, these steel are carried out to brushing, the scale having become flexible is departed from from this steel surface.
Processing of rust removing for the second time
Step (a): the aqueous sodium persulfate solution of preparation 0.5M is as reagent treatment, adopt chemical electrolysis method, the steel that at 50 ℃, scale contained in this surface impregnated in this aqueous sulfuric acid and carry out anode electrolysis 12 seconds, and current density is 200 amperes per square meter.
Step (b): these steel are taken out and remove the unnecessary aqueous sulfuric acid in surface from this reagent treatment, then with this brushing material, these steel are carried out to brushing, the scale having become flexible is departed from from this steel surface.
Processing of rust removing condition and the operations parameter of embodiment 1 are recorded in table 1 in detail.
Rust cleaning recruitment evaluation
Observe the steel surface of embodiment 1 after processing of rust removing 2 times, judge the degree that its scale is removed, and assessment result is recorded in detail table 1 by following note mode.
◎: represent that 30 times of amplifying observation steel surface scales remove completely
Zero: expression visual observation steel surface scale is removed completely
△: represent that steel surface still has scale residual
[embodiment 2 to 4]
Embodiment 2 to 4 is the scales that remove steel with way similar to Example 1, different places are: change the number of times of processing of rust removing, kind and concentration, the operating parameters of chemical electrolysis method and the number of times of processing of rust removing of reagent treatment, this reagent treatment, operating parameters and number of processes are as shown in table 1.
Carry out the rust cleaning recruitment evaluation identical with embodiment 1 by described through the steel surface of removing scale, result is as shown in table 1.
[embodiment 5]
The processing of rust removing of embodiment 5 is sequentially to carry out following steps (a) and step (b), and need repeat this processing of rust removing 2 times, and wherein the reagent treatment of step (a) does not need to change.
Step (a): prepare the aqueous sulfuric acid of 0.5M as reagent treatment, and make this reagent treatment also comprise the hydrogen peroxide of 0.5M.Adopt the method for chemical immersion steel that at 50 ℃, scale contained in this surface to impregnated in this reagent treatment 15 minutes, make scale loosening.
Step (b): these steel are taken out and remove the unnecessary reagent treatment in surface from this reagent treatment, then with this brushing material, these steel are carried out to brushing, the scale having become flexible is departed from from this steel surface.
Processing of rust removing condition and the operations parameter of embodiment 5 are recorded in table 1 in detail, and this is carried out to the rust cleaning recruitment evaluation identical with embodiment 1 through the steel surface of removing scale, and result is as shown in table 1.
[embodiment 6]
Embodiment 6 is the scales that remove steel with way similar to Example 5, repeats processing of rust removing 2 times, and the reagent treatment of step (a) does not need to change; Different places are: change the kind of reagent treatment and the operating parameters of concentration and method of chemical immersion, this reagent treatment, operating parameters and number of processes are as shown in table 1.
Embodiment 6 is carried out to the rust cleaning recruitment evaluation identical with embodiment 1 through the steel surface of removing scale, and result is as shown in table 1.
[comparative example 1]
The processing of rust removing of comparative example 1 is only carried out 1 time, and method is as follows:
Processing of rust removing for the first time
The aqueous sodium persulfate solution of step (a)-preparation 0.5M is as reagent treatment, and the steel that employing chemical electrolysis method contains scale by this surface at 30 ℃ impregnated in this aqueous sulfuric acid and carry out anode electrolysis 60 seconds, and current density is 100 amperes per square meter.
Step (b)-these steel are taken out and remove the unnecessary reagent treatment in surface from this reagent treatment, then with this brushing material, these steel are carried out to brushing, the scale having become flexible is departed from from this steel surface.
Processing of rust removing condition and the operations parameter of comparative example 1 are recorded in table 1 in detail, and this is carried out to the rust cleaning recruitment evaluation identical with embodiment 1 through the steel surface of removing scale, and result is as shown in table 1.
As shown in Table 1, embodiment 1 to 6 all carries out at least twice processing of rust removing, be to make scale loosening from steel surface by chemical electrolysis method or method of chemical immersion, then the mechanical rust removal of arranging in pairs or groups, scale can be removed completely, eliminate rust respond well.Wherein, for the first time and for the second time processing of rust removing reagent treatment used of embodiment 5 and embodiment 6 is respectively same reagent treatment, does not change, and has reduced significantly the consumption of reagent treatment.
Review the comparative example 1 that only carries out 1 processing of rust removing, to adopt chemical electrolysis method and mechanical rust removal, even if the chemical electrolysis time is obviously long compared with the total time of twice chemical electrolysis of embodiment 1, and current density is the twice of embodiment 1, still cannot completely scale be removed from steel surface.
From the above, adopt the long mode [comparative example 1] for the treatment of time of single processing of rust removing and step (a), its effect is poorer than the treatment time short [embodiment 1] of repeatedly processing of rust removing and step (a); In addition, the treatment time of step (a) is longer, the chance that scale may come off or be dissolved in this reagent treatment increases, may cause reagent treatment to reuse and must change, therefore, by shortening the treatment time of step (a) and increasing the number of times of processing of rust removing, can effectively maintain the effect of this reagent treatment.
In sum, the present invention carries out at least twice processing of rust removing by the chemical electrolysis method of step (a) or the mechanical rust removal of method of chemical immersion and step (b), scale can be removed completely from steel surface in the situation that not damaging steel, and can extend the work-ing life of this reagent treatment, reduce significantly the reagent treatment waste liquid output of serious environment pollution.
The foregoing is only preferred embodiment of the present invention, can not limit scope of the invention process with this, i.e. every simple equivalence of doing according to the present patent application the scope of the claims and invention description content changes and modifies, and all still remains within the scope of the patent.
Claims (10)
1. a method of removing the scale of steel, is characterized in that: it comprises makes steel that scale is contained on a surface carry out at least twice processing of rust removing, and this processing of rust removing is made up of step (a) and step (b):
Step (a): these steel are placed in to a reagent treatment, and utilize method of chemical immersion or chemical electrolysis method, make this scale become flexible but not depart from these steel from this steel surface; And
Step (b): these steel are shifted out in this reagent treatment, utilize mechanical means, the scale having become flexible is departed from from this steel surface.
2. the method for the scale of removal steel as claimed in claim 1, is characterized in that: these steel are to be selected from carbon steel, stainless steel or high quality steel.
3. the method for the scale of removal steel as claimed in claim 1, is characterized in that: this chemical electrolysis method is the electrically conducting manner that is selected from direct these steel of contact, or the pole-changing mode of these steel of non-direct contact.
4. the method for the scale of removal steel as claimed in claim 1, it is characterized in that: this reagent treatment comprises an aqueous solution, this aqueous solution is to be selected from aqueous sulfuric acid, aqueous sodium persulfate solution, sodium phosphate aqueous solution, trisodium phosphate aqueous solution, sodium chloride aqueous solution, chloric acid aqueous solution, ammonium sulfate solution, and ammonium phosphate solution.
5. the method for the scale of removal steel as claimed in claim 4, it is characterized in that: this aqueous solution is to be selected from 0.5 to 10M aqueous sulfuric acid, 0.1 to 2M aqueous sodium persulfate solution, 0.1 to 2M sodium phosphate aqueous solution, 0.1 to 2M trisodium phosphate aqueous solution, 0.1 to 5M sodium chloride aqueous solution, 0.1 to 2M chloric acid aqueous solution, and 0.1 to 2M ammonium sulfate solution, and 0.1 to 2M ammonium phosphate solution.
6. the method for the scale of removal steel as claimed in claim 1, is characterized in that: the treatment time of this method of chemical immersion is 10 to 30 minutes.
7. the method for the scale of removal steel as claimed in claim 1, is characterized in that: the treatment time of this chemical electrolysis method is 1 to 120 second, and current density is 10 to 400 amperes per square meter.
8. the method for the scale of removal steel as claimed in claim 1, is characterized in that: this step (a) is to carry out at 0 to 90 ℃.
9. the method for the scale of removal steel as claimed in claim 4, is characterized in that: this reagent treatment also comprises an oxygenant.
10. the method for the scale of removal steel as claimed in claim 9, is characterized in that: the concentration of this oxygenant is 0.1 to 2M, and is selected from hydrogen peroxide, chloric acid, hypochlorous acid, crosses chloric acid, or its esters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210585842.9A CN103898525A (en) | 2012-12-28 | 2012-12-28 | Method for removing scale of rolled steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210585842.9A CN103898525A (en) | 2012-12-28 | 2012-12-28 | Method for removing scale of rolled steel |
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| CN103898525A true CN103898525A (en) | 2014-07-02 |
Family
ID=50990089
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210585842.9A Pending CN103898525A (en) | 2012-12-28 | 2012-12-28 | Method for removing scale of rolled steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177601A (en) * | 2015-09-08 | 2015-12-23 | 刘高志 | Production method for detergent with rust removal function |
| CN106498415A (en) * | 2016-10-19 | 2017-03-15 | 广西钱隆投资管理有限公司 | A kind of rust remover |
| CN107418609A (en) * | 2017-06-30 | 2017-12-01 | 河南地之绿环保科技有限公司 | A kind of method for handling pyrolysis furnace inner surface |
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|---|---|---|---|---|
| CN1103114A (en) * | 1993-07-21 | 1995-05-31 | 动力有限公司 | A method for removal of certain oxide films from metal surfaces |
| US5897764A (en) * | 1996-02-02 | 1999-04-27 | Mannesmann Aktiengesellschaft | Process for the treatment of high-grade steel strips |
| CN101812694A (en) * | 2010-04-30 | 2010-08-25 | 华南理工大学 | Rapid descaling device and descaling treatment method thereof |
-
2012
- 2012-12-28 CN CN201210585842.9A patent/CN103898525A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1103114A (en) * | 1993-07-21 | 1995-05-31 | 动力有限公司 | A method for removal of certain oxide films from metal surfaces |
| US5897764A (en) * | 1996-02-02 | 1999-04-27 | Mannesmann Aktiengesellschaft | Process for the treatment of high-grade steel strips |
| CN101812694A (en) * | 2010-04-30 | 2010-08-25 | 华南理工大学 | Rapid descaling device and descaling treatment method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177601A (en) * | 2015-09-08 | 2015-12-23 | 刘高志 | Production method for detergent with rust removal function |
| CN106498415A (en) * | 2016-10-19 | 2017-03-15 | 广西钱隆投资管理有限公司 | A kind of rust remover |
| CN107418609A (en) * | 2017-06-30 | 2017-12-01 | 河南地之绿环保科技有限公司 | A kind of method for handling pyrolysis furnace inner surface |
| CN107418609B (en) * | 2017-06-30 | 2019-05-03 | 河南地之绿环保科技有限公司 | A method of processing pyrolysis furnace inner surface |
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Application publication date: 20140702 |