CN101392383A - Waste sulfuric acid circulation use technology of steel acid pickling - Google Patents
Waste sulfuric acid circulation use technology of steel acid pickling Download PDFInfo
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- CN101392383A CN101392383A CNA2008101948970A CN200810194897A CN101392383A CN 101392383 A CN101392383 A CN 101392383A CN A2008101948970 A CNA2008101948970 A CN A2008101948970A CN 200810194897 A CN200810194897 A CN 200810194897A CN 101392383 A CN101392383 A CN 101392383A
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- acid
- pickling
- sulfuric acid
- steel
- technology
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to a technology for recycling spent sulfuric acid after the steel pickling in the metallurgical industry. The technology comprises the following steps that: a. the spent sulfuric acid after the steel pickling is pumped into a processing container; and b. the spent sulfuric acid in the processing container is cooled to 15 DEG C to 3.7 DEG C; after the cooling, crystals of metal salt are laid at the lower layer in the processing container and liquid at the upper layer and the liquid extracted from the upper layer can be recycled in the steel pickling again. The technology can ensure that the acid amount of an enterprise for pickling can be reduced by more than 60 percent, which can reduce the cost in pickling for such an enterprise and realize zero draining to the environment indeed.
Description
Technical field
The present invention relates to that the sulfur waste acid behind the acid washing rolled steel recycles technology in a kind of metallurgy industry.
Background technology
Along with the continuous development that China industrial economy is built, metallurgy industry metal pickling industrial scale constantly enlarges and produces serious water source, environmental pollution.
At present, most of enterprise is used for liquid caustic soda or waste treatment to sulfur waste acid, the enterprises' loss of the spent acid solution that one ton of sulfur acid of every processing is 20% left and right sides weight percent concentration is more than 500 yuan, to produce the serious environmental pollution if flow directly into rivers, this makes metallurgy industry face awkward condition.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of significantly reduce pickling enterprise recycle technology with acid amount, acid washing rolled steel sulfur waste acid that real zero release, resource, the doulbe-sides' victory of economic each side are played in environment protection.
According to technical scheme provided by the invention, the acid of described acid washing rolled steel sulfur waste recycles technology and comprises the steps:
A, the spent acid solution behind the acid washing rolled steel is fed in the processing vessel;
B, the spent acid solution in the processing vessel is cooled to 15～3.7 ℃, after the cooling, lower floor is the xln of metal-salt in the processing vessel, and the upper strata is a fraction, and extracts the fraction on upper strata, and the upper strata fraction that extracts can be carried out the cleanup acid treatment of steel once more.
Technology of the present invention can make pickling enterprise reduce measuring with acid more than 60%, has reduced the pickling cost of pickling enterprise, and real zero release is played in environment protection.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1
A, the spent acid solution behind the acid washing rolled steel is fed in the processing vessel;
B, the spent acid solution in the processing vessel is cooled to 15～3.7 ℃, make the molysite in the spent acid solution: all heptahydrate crystallizations such as ferrous sulfate, sal epsom, copper sulfate are coprecipitated, make the moisture in the spent acid solution be pulled away a part, make the sulfuric acid weight percent concentration in the spent acid solution improve 2～3 degree, after the cooling, lower floor is the xln of metal-salt in the processing vessel, the upper strata is a fraction, and the fraction on extraction upper strata, the upper strata fraction that extracts is warming up to 60～90 ℃ of cleanup acid treatment that can carry out steel once more, reaches the purpose of recycling use.
Because molysite in the spent acid solution behind the metallurgy industry metal pickling, be mainly the ferrous sulfate concentration state that reaches capacity, can't pickling.
After the cooling, because major part is a ferrous sulfate in the metal-salt xln of lower floor, because it is separated after the crystallization, and the ferrous sulfate in the fraction of upper strata is to be in state of saturation 15～3.7 ℃ of conditions, but the upper strata fraction must be heated to 60～90 ℃ during actual pickling, as everyone knows, rising along with temperature, the solubleness of ferrous sulfate in sulfuric acid is to be rising, be warming up to promptly that ferrous sulfate is a undersaturated condition in 60～90 ℃ of upper strata fraction under the state, can carry out the cleanup acid treatment of steel once more.
Claims (1)
1, the acid of a kind of acid washing rolled steel sulfur waste recycles technology, it is characterized in that this technology comprises the steps:
A, the spent acid solution behind the acid washing rolled steel is fed in the processing vessel;
B, the spent acid solution in the processing vessel is cooled to 15～3.7 ℃, after the cooling, lower floor is the xln of metal-salt in the processing vessel, and the upper strata is a fraction, and extracts the fraction on upper strata, and the upper strata fraction that extracts can be carried out the cleanup acid treatment of steel once more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101948970A CN101392383A (en) | 2008-10-23 | 2008-10-23 | Waste sulfuric acid circulation use technology of steel acid pickling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101948970A CN101392383A (en) | 2008-10-23 | 2008-10-23 | Waste sulfuric acid circulation use technology of steel acid pickling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101392383A true CN101392383A (en) | 2009-03-25 |
Family
ID=40492888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101948970A Pending CN101392383A (en) | 2008-10-23 | 2008-10-23 | Waste sulfuric acid circulation use technology of steel acid pickling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101392383A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101759315B (en) * | 2010-01-07 | 2011-05-18 | 黄丹喜 | Method for recycling waste diluted sulfuric acid from acid washing solution of steel |
| CN107523836A (en) * | 2017-08-25 | 2017-12-29 | 中冶建筑研究总院有限公司 | A kind of steel acidleach wash after Waste Sulfuric Acid and waste hydrochloric acid mixed liquor recoverying and utilizing method |
| CN115287661A (en) * | 2022-08-23 | 2022-11-04 | 广州安博新能源科技有限公司 | Pickling device for producing and welding high-power module |
-
2008
- 2008-10-23 CN CNA2008101948970A patent/CN101392383A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101759315B (en) * | 2010-01-07 | 2011-05-18 | 黄丹喜 | Method for recycling waste diluted sulfuric acid from acid washing solution of steel |
| CN107523836A (en) * | 2017-08-25 | 2017-12-29 | 中冶建筑研究总院有限公司 | A kind of steel acidleach wash after Waste Sulfuric Acid and waste hydrochloric acid mixed liquor recoverying and utilizing method |
| CN107523836B (en) * | 2017-08-25 | 2018-11-30 | 中冶建筑研究总院有限公司 | A kind of steel acidleach wash after Waste Sulfuric Acid and waste hydrochloric acid mixed liquor recoverying and utilizing method |
| CN115287661A (en) * | 2022-08-23 | 2022-11-04 | 广州安博新能源科技有限公司 | Pickling device for producing and welding high-power module |
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| PB01 | Publication | ||
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| C12 | Rejection of a patent application after its publication | ||
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Open date: 20090325 |