CN1294295C - Hot-rolling steel plate cleaning agent - Google Patents
Hot-rolling steel plate cleaning agent Download PDFInfo
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- CN1294295C CN1294295C CNB200410027206XA CN200410027206A CN1294295C CN 1294295 C CN1294295 C CN 1294295C CN B200410027206X A CNB200410027206X A CN B200410027206XA CN 200410027206 A CN200410027206 A CN 200410027206A CN 1294295 C CN1294295 C CN 1294295C
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- cleaning agent
- chloride
- steel plate
- hot
- hydrochloric acid
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The present invention discloses a hot rolling steel plate and steel belt cleaning agent used for cleaning a black oxide film and iron rust of the surface of a hot rolling steel plate or a steel belt. The cleaning agent adopts 15% to 28% of sulphuric acid (specific gravity is 1.84), 13 to 20% of chloride ions which are added, and 32 to 71% of water, the total acidity is 40 to 60 points, and the working temperature is 20 to 80 DEG C. The cleaning agent can effectively replace concentrated hydrochloric acid to clean. The chloride ions can be obtained from chloride, such as lithium chloride, sodium chloride, ammonium chloride, hydrochloric acid, etc. The volatilization quantity of harmful gas, such as hydrogen chloride, etc., in the cleaning agent is reduced by more than 80%, the environment pollution is reduced, and the service life of equipment is extended.
Description
Technical field
The present invention relates to the clean-out system of a kind of hot-rolled steel sheet or steel band, be used for the black oxide film and the iron rust of Rapid Cleaning hot-rolled steel sheet or steel strip surface.
Background technology
Hot-rolled steel sheet or steel band are in the operation of rolling, because high temperature action, the surface can form the oxide compound Fe of one deck black
3O
4In transportation and storage process, produce the part iron rust.Usually produce cold-reduced sheet or steel band with cooled hot-rolled steel sheet or steel band, before cold rolling, must clean its surperficial black oxide film and iron rust.Because production lot is big, linear velocity is fast, and cleaning process only allows to finish in 1～2 minute.At present, widely used method is the concentrated hydrochloric acid with 28～32%, cleans under 70～80 ℃ of temperature condition, can satisfy production requirement.This method main drawback is: owing to clean under 70～80 ℃ of temperature, make that a large amount of hydrogenchloride is volatilized to be fallen, the concentrated hydrochloric acid service efficiency is low, the cost height, and environment caused severe contamination and to the corrosion of equipment; If the employing sulfuric acid cleaned, though there is not the volatilization of hydrogenchloride, cleaning temperature needs 〉=90 ℃, easily ooze hydrogen, can make steel plate or steel band increase surface hardness and fragility, to roll prolong and roll extend unfavorable fully, simultaneously, the surface of cleaning back steel plate or steel band is Dark grey, influences outward appearance and quality.
There are three pieces through the relevant patent documentation of update search:
1, application number 89103222.3 is eliminated the pickling agent of oxide layer on stainless steel surface;
2, the preparation and the application thereof of application number 88100464.2 quick low temperature rust cleaning liquid;
3, the chemical removal method of application number 87105097 stainless steel oxidation skins.
But the prescription of above three pieces of patents is all with of the present invention incomplete same, at present domestic do not see as yet to have with hot-rolled steel sheet of the present invention or steel belt detergent look into the identical bibliographical information of new point.
Summary of the invention
The present invention adopts sulfuric acid (proportion 1.84) 15%～28%, the chlorion of adding 13～20%, water 32～71%, total acidity is 40～60 points, working temperature is 20～80 ℃, cleans, and removing black oxide film and iron rust time when temperature is 60-80 ℃ is 1-2 minute, can effectively replace concentrated hydrochloric acid, wherein chlorion can obtain from muriates such as lithium chloride, sodium-chlor, ammonium chloride, hydrochloric acid.
Advantage of the present invention is:
1, the speed of cleaning hot-rolled steel sheet or steel band oxide film is identical with the hydrochloric acid cleaning performance with the outward appearance of cleaning back steel plate or steel band;
2, material price is lower by 10～15% than hydrochloric acid, and cleaning the steel plate amount increases by 10～15%;
3, the volatile quantity of hydrogenchloride obnoxious flavour reduces more than 80%, has improved environmental pollution significantly, has prolonged the work-ing life of equipment.
Embodiment:
Embodiments of the invention 1. adopt following prescription: (weight ratio)
Sulfuric acid (proportion 1.84) 24%
Lithium chloride 10%
Hydrochloric acid (proportion 1.15) 25%
Water 41%
Total acidity is 53 points, and working temperature is 60～80 ℃, scavenging period 1-1.5 minute.
Wherein lithium chloride 10% and hydrochloric acid (proportion 1.12) 25% can obtain chlorion 15.5%.
Embodiment 2. adopts following prescription (weight ratio)
Sulfuric acid (proportion 1.84) 22%
Hydrochloric acid (proportion 1.15) 35%
Ammonium chloride 5%
Water 38%
Total acidity is 50 points, and working temperature is 60～80 ℃, scavenging period 1-1.5 minute.
Wherein hydrochloric acid (proportion 1.15) 35% and ammonium chloride 5% can obtain chlorion 13.3%.
[notes]: total acidity " point ": get 100 milliliters of 10 milliliters of product adding distil waters, 3-5 drips with phenolphthalein indicator, and with the NaOH titration of 1N to terminal, consuming 1N NaOH is 1 " point " for 1 milliliter.
Claims (1)
1, a kind of hot-rolled steel sheet clean-out system is characterized in that comprising following material, and wherein said per-cent is weight ratio:
Proportion is 1.84 sulfuric acid 15～28%
Chlorion 13～20%
Water 32～71%
Above-mentioned component content summation is 100%, and total acidity is 40～60 points, and working temperature is 20～80 ℃, total acidity " point ": get 100 milliliters of 10 milliliters of product adding distil waters, 3-5 drips with phenolphthalein indicator, and with the NaOH titration of 1N to terminal, consuming 1N NaOH is 1 " point " for 1 milliliter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410027206XA CN1294295C (en) | 2004-05-17 | 2004-05-17 | Hot-rolling steel plate cleaning agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410027206XA CN1294295C (en) | 2004-05-17 | 2004-05-17 | Hot-rolling steel plate cleaning agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1580328A CN1580328A (en) | 2005-02-16 |
| CN1294295C true CN1294295C (en) | 2007-01-10 |
Family
ID=34582010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410027206XA Expired - Fee Related CN1294295C (en) | 2004-05-17 | 2004-05-17 | Hot-rolling steel plate cleaning agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1294295C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100338262C (en) * | 2005-03-04 | 2007-09-19 | 河北工业大学 | Compound cleaning method for hot dip steel member |
| CN101947536B (en) * | 2010-10-15 | 2012-02-01 | 王帮建 | Recycling method of waste sheet iron packing drum |
| JP6094576B2 (en) * | 2012-04-03 | 2017-03-15 | 日立金属株式会社 | Method for producing Fe-Al alloy |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0543729B1 (en) * | 1991-11-20 | 1995-07-26 | Sollac | Pickling process for mild steel and bath for pickling |
-
2004
- 2004-05-17 CN CNB200410027206XA patent/CN1294295C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0543729B1 (en) * | 1991-11-20 | 1995-07-26 | Sollac | Pickling process for mild steel and bath for pickling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1580328A (en) | 2005-02-16 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |