CN110127800A - A kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor - Google Patents
A kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor Download PDFInfo
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- CN110127800A CN110127800A CN201910266581.6A CN201910266581A CN110127800A CN 110127800 A CN110127800 A CN 110127800A CN 201910266581 A CN201910266581 A CN 201910266581A CN 110127800 A CN110127800 A CN 110127800A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/26—Treatment of water, waste water, or sewage by extraction
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Organic Chemistry (AREA)
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- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
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Abstract
The present invention relates to field of industrial waste water treatment, and in particular to a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor includes the following steps: 1) to handle to obtain the first treatment fluid by oil separator by pickle liquor；2) the first treatment fluid and mixed in hydrochloric acid obtain second processing liquid；3) second processing liquid obtains third treatment fluid after the processing of the first extraction equipment；4) third treatment fluid obtains fourth process liquid after the processing of the second extraction equipment；5) fourth process liquid obtains the 5th treatment fluid after the first back extraction device processing；6) the 5th treatment fluid obtains the 6th treatment fluid after the second back extraction device processing；7) the 6th treatment fluid obtains the 7th treatment fluid after back extraction oil separator processing；8) the four, the 7th treatment fluids can be recycled after detection is up to standard for production line.Iron content is extremely low in waste liquid after recovery method processing in the present invention, not only reduces processing cost and can also be back on production line through handling hydrochloric acid after the recovery.
Description
Technical field
The present invention relates to field of industrial waste water treatment, and in particular to a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor.
Background technique
Iron and steel enterprise generates a large amount of smelting wastewater and rolling effluent in process of production, and pickling is producing stainless steel process
In essential process.At present mainly using the modes such as acid-base neutralization, heating evaporation, spray burning to pickle liquor at
Reason.Steel rolling mill's hydrochloride waste conventional treatment, which is discharged to sewage plant, will consume a large amount of Dephosphorization reagent, and generate the very high danger of water content
Dangerous waste not only wastes processing cost, also to pay expensive treatment of sludge expense.It is equally put into according to rectifying or membrane distillation
Cost is excessively high, and adding, energy consumption is excessively high, is unfavorable for environmental protection cause sustainable development, and such absorption method processing hydrochloric acid can not only drop
Reduction process cost can also be brought newly into phosphoric acid.
Summary of the invention
In order to overcome shortcoming and defect existing in the prior art, the purpose of the present invention is to provide a kind of steel rolling mill's hydrochloric acid
The recovery method of pickle liquor can't detect by iron content in the recovery method treated waste liquid, not only reduce place
Cost is managed, and can also be back on production line through handling hydrochloric acid after the recovery.
The purpose of the invention is achieved by the following technical solution: a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor, packet
Include following steps:
1) pickle liquor gathered is obtained into the first treatment fluid after oil separator removes impurity；
It 2) be 20-40% hydrochloric acid by the first treatment fluid obtained in step 1) and concentration according to volume ratio is that 6-10:2 is mixed
After obtain second processing liquid；
3) second processing liquid obtained in step 2) is obtained into third treatment fluid after the processing of the first extraction equipment；
4) third treatment fluid obtained in step 3) is obtained into fourth process liquid after the processing of the second extraction equipment；
5) fourth process liquid obtained in step 4) is obtained into the 5th treatment fluid after the first back extraction device processing；
6) the 5th treatment fluid obtained in step 5) is obtained into the 6th treatment fluid after the second back extraction device processing；
7) the 6th treatment fluid obtained in step 6) is obtained into the 7th treatment fluid after back extraction oil separator processing；
8) fourth process liquid obtained in step 7) and the 7th treatment fluid can be recycled after detection is up to standard for production line.
Pickle liquor, can be by the content of the metals such as iron in pickle liquor after the processing of above-mentioned processing method in the present invention
It is down to and is substantially not detectable, not only reduce processing cost, and production line can also be back to through handling hydrochloric acid after the recovery
On, a large amount of Dephosphorization reagent will be consumed by avoiding conventional treatment and being discharged to sewage plant, and generate the very high hazardous waste of water content, no
But the problem of wasting processing cost, also paying expensive treatment of sludge expense, and avoid bringing newly into phosphoric acid.
Preferably, added with extractant in first extraction equipment and the second extraction equipment, the extractant is served as reasons
N235, sec-octyl alcohol and space flight quality of gasoline are than the mixture that forms for 4-5:3-4:2.
Extractant used is that 4-5:3-4:2 mixing forms by N235, sec-octyl alcohol and space flight kerosene mass ratio in the present invention,
Middle N235 and sec-octyl alcohol have the advantages such as strong to hydrochloric acid extracting power, selectivity is good, solubility is small in water, are from hydrochloride waste
Middle extraction hydrochloric acid optimum extractant, the in addition cooperation of space flight kerosene are compounded with the advantage of three, the composite extractant made
It is more preferably excellent to the effect of extracting of hydrochloric acid.
Preferably, it is 2-3mol/L that the examination criteria of the 7th treatment fluid described in step 8), which is water outlet hydrochloric acid, be can't detect
Iron content.
For hydrochloride waste after the above method is handled, reaching water outlet hydrochloric acid is 2-3mol/L in the present invention, can't detect iron and contains
Treatment fluid after the standard of amount can be back on production line, and a large amount of dephosphorization will be consumed by avoiding conventional treatment and being discharged to sewage plant
Medicament, and the very high hazardous waste of water content is generated, processing cost is not only wasted, asking for expensive treatment of sludge expense is also paid
Topic.
Preferably, oil separator described in step 1) includes the first oil separator and the second oil separator, first oil separator
Outlet end is connected with the input end of second oil separator；First extraction equipment described in step 3) be equipped with No.1 input end,
No. two input ends, No.1 outlet end and No. two outlet ends, the No.1 input end of first extraction equipment with described second every
The outlet end of oil sump is connected to；Second extraction equipment described in step 4) is equipped with No.1 input end, No. two input ends, No. three imports
End, No. four input ends, No.1 outlet end and No. two outlet ends, the No.1 input end of second extraction equipment and described first
The No.1 outlet end of extraction equipment is connected to；No. two of the No.1 outlet end of second extraction equipment and first extraction equipment
Input end connection；No. four input ends of second extraction equipment are connected to No. two outlet ends of second extraction equipment.
Hydrochloride waste can remove the impurity such as organic matter by the processing of oil separator twice well in step 1) of the present invention, it
It, can be efficiently by the iron etc. in hydrochloride waste by the first extraction equipment and the second extraction equipment cycling extraction in step 3
Impurity is separated in organic phase, plays the role of removal of impurities, while such connection type avoids extractant entrainment, is effectively saved extraction
The dosage for taking agent sum improves the quality of recycling product.
Preferably, first extraction equipment goes out equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two
Mouth end；Second extraction equipment is equipped with No.1 input end, No. two input ends, No. three input ends, No.1 outlet end and No. two outlets
End；First back extraction device is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；Second back extraction
Device is taken to be equipped with No.1 outlet end, No. two outlet ends and No. three outlet ends；The first back extraction oil separator is equipped with No.1 import
End and No. two input ends.
Preferably, the first back extraction device described in step 5) is equipped with No.1 input end, No. two input ends, No.1 outlet end
And No. two outlet ends, the No.1 input end of the first back extraction device and No. two outlet ends of first extraction equipment connect
It is logical；Second back extraction device described in step 6) is equipped with No.1 outlet end, No. two outlet ends and No. three outlet ends, and described second is anti-
The input end of extraction equipment is connected to the No.1 outlet end of the first back extraction device；The No.1 of the second back extraction device
Outlet end is connected to No. two input ends of the second extraction equipment, No. two outlet ends and described first of the second back extraction device
It is stripped No. two input ends connection of device, No. three outlet ends of the second back extraction device and second extraction equipment
No. three input end connections；Back extraction oil separator described in step 7) includes the first back extraction oil separator and the second back extraction oil removal
Pond, the first back extraction oil separator are equipped with No.1 input end and No. two input ends, and No. two of the first back extraction device go out
Mouth end is connected to the No.1 input end of the first back extraction oil separator, No. three outlet ends of the second back extraction device and institute
State No. two input ends connection of the first back extraction oil separator, the outlet end of the first back extraction oil separator and second back extraction
The input end of oil separator is taken to be connected to.
The present invention handles the fourth process liquid after secondary cycle extraction processing through secondary cycle back extraction again, obtains
It can be back to the extractant of extraction and second of extraction for the first time, in addition the part after the second back extraction device is not located completely
The hydrochloride waste managed can transport to the second extraction equipment and continue cycling through processing, until processing is up to standard.And this connection side
Formula avoids the entrainment of strippant, is effectively saved the dosage of strippant, improves the quality of recycling product.
The beneficial effects of the present invention are: a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor, it can be by pickle liquor
The content of the metals such as middle iron, which is down to, to be substantially not detectable, and not only reduces processing cost, and through handling hydrochloric acid after the recovery also
It can be back on production line, a large amount of Dephosphorization reagent will be consumed by avoiding conventional treatment and being discharged to sewage plant, and generate water content
The problem of very high hazardous waste not only wastes processing cost, also to pay expensive treatment of sludge expense, and avoid bringing new
Into phosphoric acid.
Detailed description of the invention
Fig. 1 is flow diagram of the invention.
Specific embodiment
For the ease of the understanding of those skilled in the art, make below with reference to 1 couple of present invention of examples and drawings further
Illustrate, the content that embodiment refers to not is limitation of the invention.
Embodiment 1
A kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor, includes the following steps:
1) pickle liquor gathered is obtained into the first treatment fluid after oil separator removes impurity；
It 2) be 20% hydrochloric acid solution by the first treatment fluid obtained in step 1) and concentration according to volume ratio is after 6:2 is mixed
Obtain second processing liquid；
3) second processing liquid obtained in step 2) is obtained into third treatment fluid after the processing of the first extraction equipment；
4) third treatment fluid obtained in step 3) is obtained into fourth process liquid after the processing of the second extraction equipment；
5) fourth process liquid obtained in step 4) is obtained into the 5th treatment fluid after the first back extraction device processing；
6) the 5th treatment fluid obtained in step 5) is obtained into the 6th treatment fluid after the second back extraction device processing；
7) the 6th treatment fluid obtained in step 6) is obtained into the 7th treatment fluid after back extraction oil separator processing；
8) fourth process liquid obtained in step 7) and the 7th treatment fluid can be recycled after detection is up to standard for production line.
First extraction equipment is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；The
Two extraction equipments are equipped with No.1 input end, No. two input ends, No. three input ends, No.1 outlet end and No. two outlet ends；First
It is stripped device and is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；Second back extraction device is set
There are No.1 outlet end, No. two outlet ends and No. three outlet ends；The first back extraction oil separator is equipped with No.1 input end and No. two
Input end.
Added with extractant in first extraction equipment and the second extraction equipment, the extractant is by N235, Zhong Xin
Pure and mild space flight gasoline is according to the mixture that mass ratio is that 4:3:2 is formed.
The examination criteria of 7th treatment fluid described in step 8) is that water outlet hydrochloric acid is 2mol/L, can't detect iron content.
First extraction equipment described in step 3) is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two
Outlet end, the No.1 input end of first extraction equipment are connected to the outlet end of second oil separator.
Second extraction equipment described in step 4) is equipped with No.1 input end, No. two input ends, No. three input ends, No. four imports
End, No.1 outlet end and No. two outlet ends, the No.1 input end of second extraction equipment and first extraction equipment
The connection of No.1 outlet end；No. two input ends of the No.1 outlet end of second extraction equipment and first extraction equipment connect
It is logical；No. four input ends of second extraction equipment are connected to No. two outlet ends of second extraction equipment.
First back extraction device described in step 5) is equipped with No.1 input end, No. two input ends, No.1 outlet end and two
The No.1 input end of number outlet end, the first back extraction device is connected to No. two outlet ends of first extraction equipment；Step
It is rapid 6) described in second back extraction device be equipped with No.1 outlet end, No. two outlet ends and No. three outlet ends, it is described second back extraction
The input end of device is connected to the No.1 outlet end of the first back extraction device；The No.1 outlet of the second back extraction device
End is connected to No. two input ends of the second extraction equipment, No. two outlet ends of the second back extraction device and first back extraction
No. two input ends of device are taken to be connected to, described second is stripped No. three of No. three outlet ends of device and second extraction equipment
Input end connection；Back extraction oil separator described in step 7) includes the first back extraction oil separator and the second back extraction oil separator, institute
The first back extraction oil separator is stated equipped with No.1 input end and No. two input ends, No. two outlet ends of the first back extraction device with
The No.1 input end connection of the first back extraction oil separator, No. three outlet ends and described first of the second back extraction device
It is stripped No. two input ends connection of oil separator, the outlet end of the first back extraction oil separator and the second back extraction oil removal
The input end in pond is connected to.
Embodiment 2
A kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor, includes the following steps:
1) pickle liquor gathered is obtained into the first treatment fluid after oil separator removes impurity；
It 2) be 25% hydrochloric acid solution by the first treatment fluid obtained in step 1) and concentration according to volume ratio is after 7:2 is mixed
Obtain second processing liquid；The mass fraction of the hydrochloric acid solution is
3) second processing liquid obtained in step 2) is obtained into third treatment fluid after the processing of the first extraction equipment；
4) third treatment fluid obtained in step 3) is obtained into fourth process liquid after the processing of the second extraction equipment；
5) fourth process liquid obtained in step 4) is obtained into the 5th treatment fluid after the first back extraction device processing；
6) the 5th treatment fluid obtained in step 5) is obtained into the 6th treatment fluid after the second back extraction device processing；
7) the 6th treatment fluid obtained in step 6) is obtained into the 7th treatment fluid after back extraction oil separator processing；
8) fourth process liquid obtained in step 7) and the 7th treatment fluid can be recycled after detection is up to standard for production line.
First extraction equipment is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；The
Two extraction equipments are equipped with No.1 input end, No. two input ends, No. three input ends, No.1 outlet end and No. two outlet ends；First
It is stripped device and is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；Second back extraction device is set
There are No.1 outlet end, No. two outlet ends and No. three outlet ends；The first back extraction oil separator is equipped with No.1 input end and No. two
Input end.
Added with extractant in first extraction equipment and the second extraction equipment, the extractant is by N235, Zhong Xin
Pure and mild space flight gasoline is according to the mixture that mass ratio is that 4.3:3.3:2 is formed.
The examination criteria of 7th treatment fluid described in step 8) is that water outlet hydrochloric acid is 2.3mol/L, can't detect iron content.
First extraction equipment described in step 3) is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two
Outlet end, the No.1 input end of first extraction equipment are connected to the outlet end of second oil separator.
Second extraction equipment described in step 4) is equipped with No.1 input end, No. two input ends, No. three input ends, No. four imports
End, No.1 outlet end and No. two outlet ends, the No.1 input end of second extraction equipment and first extraction equipment
The connection of No.1 outlet end；No. two input ends of the No.1 outlet end of second extraction equipment and first extraction equipment connect
It is logical；No. four input ends of second extraction equipment are connected to No. two outlet ends of second extraction equipment.
First back extraction device described in step 5) is equipped with No.1 input end, No. two input ends, No.1 outlet end and two
The No.1 input end of number outlet end, the first back extraction device is connected to No. two outlet ends of first extraction equipment；Step
It is rapid 6) described in second back extraction device be equipped with No.1 outlet end, No. two outlet ends and No. three outlet ends, it is described second back extraction
The input end of device is connected to the No.1 outlet end of the first back extraction device；The No.1 outlet of the second back extraction device
End is connected to No. two input ends of the second extraction equipment, No. two outlet ends of the second back extraction device and first back extraction
No. two input ends of device are taken to be connected to, described second is stripped No. three of No. three outlet ends of device and second extraction equipment
Input end connection；Back extraction oil separator described in step 7) includes the first back extraction oil separator and the second back extraction oil separator, institute
The first back extraction oil separator is stated equipped with No.1 input end and No. two input ends, No. two outlet ends of the first back extraction device with
The No.1 input end connection of the first back extraction oil separator, No. three outlet ends and described first of the second back extraction device
It is stripped No. two input ends connection of oil separator, the outlet end of the first back extraction oil separator and the second back extraction oil removal
The input end in pond is connected to.
Embodiment 3
A kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor, includes the following steps:
1) pickle liquor gathered is obtained into the first treatment fluid after oil separator removes impurity；
It 2) be 30% hydrochloric acid solution by the first treatment fluid obtained in step 1) and concentration according to volume ratio is after 8:2 is mixed
Obtain second processing liquid；
3) second processing liquid obtained in step 2) is obtained into third treatment fluid after the processing of the first extraction equipment；
4) third treatment fluid obtained in step 3) is obtained into fourth process liquid after the processing of the second extraction equipment；
5) fourth process liquid obtained in step 4) is obtained into the 5th treatment fluid after the first back extraction device processing；
6) the 5th treatment fluid obtained in step 5) is obtained into the 6th treatment fluid after the second back extraction device processing；
7) the 6th treatment fluid obtained in step 6) is obtained into the 7th treatment fluid after back extraction oil separator processing；
8) fourth process liquid obtained in step 7) and the 7th treatment fluid can be recycled after detection is up to standard for production line.
First extraction equipment is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；The
Two extraction equipments are equipped with No.1 input end, No. two input ends, No. three input ends, No.1 outlet end and No. two outlet ends；First
It is stripped device and is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；Second back extraction device is set
There are No.1 outlet end, No. two outlet ends and No. three outlet ends；The first back extraction oil separator is equipped with No.1 input end and No. two
Input end.
Added with extractant in first extraction equipment and the second extraction equipment, the extractant is by N235, Zhong Xin
Pure and mild space flight gasoline is according to the mixture that mass ratio is that 4.5:3.5:2 is formed.
The examination criteria of 7th treatment fluid described in step 8) is that water outlet hydrochloric acid is 2.5mol/L, can't detect iron content.
First extraction equipment described in step 3) is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two
Outlet end, the No.1 input end of first extraction equipment are connected to the outlet end of second oil separator.
Second extraction equipment described in step 4) is equipped with No.1 input end, No. two input ends, No. three input ends, No. four imports
End, No.1 outlet end and No. two outlet ends, the No.1 input end of second extraction equipment and first extraction equipment
The connection of No.1 outlet end；No. two input ends of the No.1 outlet end of second extraction equipment and first extraction equipment connect
It is logical；No. four input ends of second extraction equipment are connected to No. two outlet ends of second extraction equipment.
First back extraction device described in step 5) is equipped with No.1 input end, No. two input ends, No.1 outlet end and two
The No.1 input end of number outlet end, the first back extraction device is connected to No. two outlet ends of first extraction equipment；Step
It is rapid 6) described in second back extraction device be equipped with No.1 outlet end, No. two outlet ends and No. three outlet ends, it is described second back extraction
The input end of device is connected to the No.1 outlet end of the first back extraction device；The No.1 outlet of the second back extraction device
End is connected to No. two input ends of the second extraction equipment, No. two outlet ends of the second back extraction device and first back extraction
No. two input ends of device are taken to be connected to, described second is stripped No. three of No. three outlet ends of device and second extraction equipment
Input end connection；Back extraction oil separator described in step 7) includes the first back extraction oil separator and the second back extraction oil separator, institute
The first back extraction oil separator is stated equipped with No.1 input end and No. two input ends, No. two outlet ends of the first back extraction device with
The No.1 input end connection of the first back extraction oil separator, No. three outlet ends and described first of the second back extraction device
It is stripped No. two input ends connection of oil separator, the outlet end of the first back extraction oil separator and the second back extraction oil removal
The input end in pond is connected to.
Embodiment 4
A kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor, includes the following steps:
1) pickle liquor gathered is obtained into the first treatment fluid after oil separator removes impurity；
It 2) be 35% hydrochloric acid solution by the first treatment fluid obtained in step 1) and concentration according to volume ratio is after 9:2 is mixed
Obtain second processing liquid；
3) second processing liquid obtained in step 2) is obtained into third treatment fluid after the processing of the first extraction equipment；
4) third treatment fluid obtained in step 3) is obtained into fourth process liquid after the processing of the second extraction equipment；
5) fourth process liquid obtained in step 4) is obtained into the 5th treatment fluid after the first back extraction device processing；
6) the 5th treatment fluid obtained in step 5) is obtained into the 6th treatment fluid after the second back extraction device processing；
7) the 6th treatment fluid obtained in step 6) is obtained into the 7th treatment fluid after back extraction oil separator processing；
8) fourth process liquid obtained in step 7) and the 7th treatment fluid can be recycled after detection is up to standard for production line.
First extraction equipment is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；The
Two extraction equipments are equipped with No.1 input end, No. two input ends, No. three input ends, No.1 outlet end and No. two outlet ends；First
It is stripped device and is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；Second back extraction device is set
There are No.1 outlet end, No. two outlet ends and No. three outlet ends；The first back extraction oil separator is equipped with No.1 input end and No. two
Input end.
Added with extractant in first extraction equipment and the second extraction equipment, the extractant is by N235, Zhong Xin
Pure and mild space flight gasoline is according to the mixture that mass ratio is that 4.8:3.8:2 is formed.
The examination criteria of 7th treatment fluid described in step 8) is that water outlet hydrochloric acid is 2.8mol/L, can't detect iron content.
First extraction equipment described in step 3) is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two
Outlet end, the No.1 input end of first extraction equipment are connected to the outlet end of second oil separator.
Second extraction equipment described in step 4) is equipped with No.1 input end, No. two input ends, No. three input ends, No. four imports
End, No.1 outlet end and No. two outlet ends, the No.1 input end of second extraction equipment and first extraction equipment
The connection of No.1 outlet end；No. two input ends of the No.1 outlet end of second extraction equipment and first extraction equipment connect
It is logical；No. four input ends of second extraction equipment are connected to No. two outlet ends of second extraction equipment.
First back extraction device described in step 5) is equipped with No.1 input end, No. two input ends, No.1 outlet end and two
The No.1 input end of number outlet end, the first back extraction device is connected to No. two outlet ends of first extraction equipment；Step
It is rapid 6) described in second back extraction device be equipped with No.1 outlet end, No. two outlet ends and No. three outlet ends, it is described second back extraction
The input end of device is connected to the No.1 outlet end of the first back extraction device；The No.1 outlet of the second back extraction device
End is connected to No. two input ends of the second extraction equipment, No. two outlet ends of the second back extraction device and first back extraction
No. two input ends of device are taken to be connected to, described second is stripped No. three of No. three outlet ends of device and second extraction equipment
Input end connection；Back extraction oil separator described in step 7) includes the first back extraction oil separator and the second back extraction oil separator, institute
The first back extraction oil separator is stated equipped with No.1 input end and No. two input ends, No. two outlet ends of the first back extraction device with
The No.1 input end connection of the first back extraction oil separator, No. three outlet ends and described first of the second back extraction device
It is stripped No. two input ends connection of oil separator, the outlet end of the first back extraction oil separator and the second back extraction oil removal
The input end in pond is connected to.
Embodiment 5
A kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor, includes the following steps:
1) pickle liquor gathered is obtained into the first treatment fluid after oil separator removes impurity；
2) by the first treatment fluid obtained in step 1) be 40% hydrochloric acid solution according to volume ratio with concentration be 10:2 mixed
Second processing liquid is obtained after conjunction；
3) second processing liquid obtained in step 2) is obtained into third treatment fluid after the processing of the first extraction equipment；
4) third treatment fluid obtained in step 3) is obtained into fourth process liquid after the processing of the second extraction equipment；
5) fourth process liquid obtained in step 4) is obtained into the 5th treatment fluid after the first back extraction device processing；
6) the 5th treatment fluid obtained in step 5) is obtained into the 6th treatment fluid after the second back extraction device processing；
7) the 6th treatment fluid obtained in step 6) is obtained into the 7th treatment fluid after back extraction oil separator processing；
8) fourth process liquid obtained in step 7) and the 7th treatment fluid can be recycled after detection is up to standard for production line.
First extraction equipment is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；The
Two extraction equipments are equipped with No.1 input end, No. two input ends, No. three input ends, No.1 outlet end and No. two outlet ends；First
It is stripped device and is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；Second back extraction device is set
There are No.1 outlet end, No. two outlet ends and No. three outlet ends；The first back extraction oil separator is equipped with No.1 input end and No. two
Input end.
Added with extractant in first extraction equipment and the second extraction equipment, the extractant is by N235, Zhong Xin
Pure and mild space flight gasoline is according to the mixture that mass ratio is that 5:4:2 is formed.
The examination criteria of 7th treatment fluid described in step 8) is that water outlet hydrochloric acid is 3mol/L, can't detect iron content.
First extraction equipment described in step 3) is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two
Outlet end, the No.1 input end of first extraction equipment are connected to the outlet end of second oil separator.
Second extraction equipment described in step 4) is equipped with No.1 input end, No. two input ends, No. three input ends, No. four imports
End, No.1 outlet end and No. two outlet ends, the No.1 input end of second extraction equipment and first extraction equipment
The connection of No.1 outlet end；No. two input ends of the No.1 outlet end of second extraction equipment and first extraction equipment connect
It is logical；No. four input ends of second extraction equipment are connected to No. two outlet ends of second extraction equipment.
First back extraction device described in step 5) is equipped with No.1 input end, No. two input ends, No.1 outlet end and two
The No.1 input end of number outlet end, the first back extraction device is connected to No. two outlet ends of first extraction equipment；Step
It is rapid 6) described in second back extraction device be equipped with No.1 outlet end, No. two outlet ends and No. three outlet ends, it is described second back extraction
The input end of device is connected to the No.1 outlet end of the first back extraction device；The No.1 outlet of the second back extraction device
End is connected to No. two input ends of the second extraction equipment, No. two outlet ends of the second back extraction device and first back extraction
No. two input ends of device are taken to be connected to, described second is stripped No. three of No. three outlet ends of device and second extraction equipment
Input end connection；Back extraction oil separator described in step 7) includes the first back extraction oil separator and the second back extraction oil separator, institute
The first back extraction oil separator is stated equipped with No.1 input end and No. two input ends, No. two outlet ends of the first back extraction device with
The No.1 input end connection of the first back extraction oil separator, No. three outlet ends and described first of the second back extraction device
It is stripped No. two input ends connection of oil separator, the outlet end of the first back extraction oil separator and the second back extraction oil removal
The input end in pond is connected to.
Comparative example 1
A kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor, includes the following steps:
1) pickle liquor gathered is obtained into the first treatment fluid after oil separator removes impurity；
2) the first treatment fluid obtained in step 1) is obtained into second processing liquid after the processing of the first extraction equipment；
3) second processing liquid obtained in step 2) is obtained into third treatment fluid after the processing of the second extraction equipment；
4) third treatment fluid obtained in step 3) is obtained into fourth process liquid after the first back extraction device processing；
5) fourth process liquid obtained in step 4) is obtained into the 5th treatment fluid after the second back extraction device processing；
6) the 5th treatment fluid obtained in step 5) is obtained into the 6th treatment fluid after back extraction oil separator processing；
7) third treatment fluid obtained in step 6) and the 6th treatment fluid can be recycled after detection is up to standard for production line.
First extraction equipment is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；The
Two extraction equipments are equipped with No.1 input end, No. two input ends, No. three input ends, No.1 outlet end and No. two outlet ends；First
It is stripped device and is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；Second back extraction device is set
There are No.1 outlet end, No. two outlet ends and No. three outlet ends；The first back extraction oil separator is equipped with No.1 input end and No. two
Input end.
Added with extractant in first extraction equipment and the second extraction equipment, the extractant is by N235, Zhong Xin
Pure and mild space flight gasoline is according to the mixture that mass ratio is that 4:3:2 is formed.
The examination criteria of 6th treatment fluid described in step 7) is that water outlet hydrochloric acid is 2mol/L, can't detect iron content.
First extraction equipment described in step 2) is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two
Outlet end, the No.1 input end of first extraction equipment are connected to the outlet end of second oil separator.
Second extraction equipment described in step 3) is equipped with No.1 input end, No. two input ends, No. three input ends, No. four imports
End, No.1 outlet end and No. two outlet ends, the No.1 input end of second extraction equipment and first extraction equipment
The connection of No.1 outlet end；No. two input ends of the No.1 outlet end of second extraction equipment and first extraction equipment connect
It is logical；No. four input ends of second extraction equipment are connected to No. two outlet ends of second extraction equipment.
First back extraction device described in step 4) is equipped with No.1 input end, No. two input ends, No.1 outlet end and two
The No.1 input end of number outlet end, the first back extraction device is connected to No. two outlet ends of first extraction equipment；Step
It is rapid 5) described in second back extraction device be equipped with No.1 outlet end, No. two outlet ends and No. three outlet ends, it is described second back extraction
The input end of device is connected to the No.1 outlet end of the first back extraction device；The No.1 outlet of the second back extraction device
End is connected to No. two input ends of the second extraction equipment, No. two outlet ends of the second back extraction device and first back extraction
No. two input ends of device are taken to be connected to, described second is stripped No. three of No. three outlet ends of device and second extraction equipment
Input end connection；Back extraction oil separator described in step 6) includes the first back extraction oil separator and the second back extraction oil separator, institute
The first back extraction oil separator is stated equipped with No.1 input end and No. two input ends, No. two outlet ends of the first back extraction device with
The No.1 input end connection of the first back extraction oil separator, No. three outlet ends and described first of the second back extraction device
It is stripped No. two input ends connection of oil separator, the outlet end of the first back extraction oil separator and the second back extraction oil removal
The input end in pond is connected to.
Comparative example 2
A kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor, includes the following steps:
1) pickle liquor gathered is obtained into the first treatment fluid after oil separator removes impurity；
It 2) be 30% hydrochloric acid solution by the first treatment fluid obtained in step 1) and concentration according to volume ratio is after 8:2 is mixed
Obtain second processing liquid；
3) second processing liquid obtained in step 2) is obtained into third treatment fluid after the processing of the first extraction equipment；
4) third treatment fluid obtained in step 3) is obtained into fourth process liquid after the processing of the second extraction equipment；
5) fourth process liquid obtained in step 4) is obtained into the 5th treatment fluid after the first back extraction device processing；
6) the 5th treatment fluid obtained in step 5) is obtained into the 6th treatment fluid after the second back extraction device processing；
7) the 6th treatment fluid obtained in step 6) is obtained into the 7th treatment fluid after back extraction oil separator processing；
8) fourth process liquid obtained in step 7) and the 7th treatment fluid can be recycled after detection is up to standard for production line.
First extraction equipment is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；The
Two extraction equipments are equipped with No.1 input end, No. two input ends, No. three input ends, No.1 outlet end and No. two outlet ends；First
It is stripped device and is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；Second back extraction device is set
There are No.1 outlet end, No. two outlet ends and No. three outlet ends；The first back extraction oil separator is equipped with No.1 input end and No. two
Input end.
First extraction equipment is by N235, sec-octyl alcohol and space flight gasoline according to matter added with extractant, the extractant
Amount is than the mixture for 4.5:3.5:2 composition.
The examination criteria of 7th treatment fluid described in step 8) is that water outlet hydrochloric acid is 2.5mol/L, can't detect iron content.
First extraction equipment described in step 3) is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two
Outlet end, the No.1 input end of first extraction equipment are connected to the outlet end of second oil separator.
Second extraction equipment described in step 4) is equipped with No.1 input end, No. two input ends, No. three input ends, No. four imports
End, No.1 outlet end and No. two outlet ends, the No.1 input end of second extraction equipment and first extraction equipment
The connection of No.1 outlet end；No. two input ends of the No.1 outlet end of second extraction equipment and first extraction equipment connect
It is logical；No. four input ends of second extraction equipment are connected to No. two outlet ends of second extraction equipment.
First back extraction device described in step 5) is equipped with No.1 input end, No. two input ends, No.1 outlet end and two
The No.1 input end of number outlet end, the first back extraction device is connected to No. two outlet ends of first extraction equipment；Step
It is rapid 6) described in second back extraction device be equipped with No.1 outlet end, No. two outlet ends and No. three outlet ends, it is described second back extraction
The input end of device is connected to the No.1 outlet end of the first back extraction device；The No.1 outlet of the second back extraction device
End is connected to No. two input ends of the second extraction equipment, No. two outlet ends of the second back extraction device and first back extraction
No. two input ends of device are taken to be connected to, described second is stripped No. three of No. three outlet ends of device and second extraction equipment
Input end connection；Back extraction oil separator described in step 7) includes the first back extraction oil separator and the second back extraction oil separator, institute
The first back extraction oil separator is stated equipped with No.1 input end and No. two input ends, No. two outlet ends of the first back extraction device with
The No.1 input end connection of the first back extraction oil separator, No. three outlet ends and described first of the second back extraction device
It is stripped No. two input ends connection of oil separator, the outlet end of the first back extraction oil separator and the second back extraction oil removal
The input end in pond is connected to.
Comparative example 3
A kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor, includes the following steps:
1) pickle liquor gathered is obtained into the first treatment fluid after oil separator removes impurity；
It 2) be 40% hydrochloric acid solution by the first treatment fluid obtained in step 1) and concentration according to volume ratio is that 10:2 is mixed
After obtain second processing liquid；
3) second processing liquid obtained in step 2) is obtained into third treatment fluid after the processing of the first extraction equipment；
4) third treatment fluid obtained in step 3) is obtained into fourth process liquid after the processing of the second extraction equipment；
5) fourth process liquid obtained in step 4) is obtained into the 5th treatment fluid after the first back extraction device processing；
6) the 5th treatment fluid obtained in step 5) is obtained into the 6th treatment fluid after the second back extraction device processing；
7) the 6th treatment fluid obtained in step 6) is obtained into the 7th treatment fluid after back extraction oil separator processing；
8) fourth process liquid obtained in step 7) and the 7th treatment fluid can be recycled after detection is up to standard for production line.
First extraction equipment is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；The
Two extraction equipments are equipped with No.1 input end, No. two input ends, No. three input ends, No.1 outlet end and No. two outlet ends；First
It is stripped device and is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；Second back extraction device is set
There are No.1 outlet end, No. two outlet ends and No. three outlet ends；The first back extraction oil separator is equipped with No.1 input end and No. two
Input end.
Added with extractant in first extraction equipment and the second extraction equipment, the extractant is N235.
The examination criteria of 7th treatment fluid described in step 8) is that water outlet hydrochloric acid is 3mol/L, can't detect iron content.
First extraction equipment described in step 3) is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two
Outlet end, the No.1 input end of first extraction equipment are connected to the outlet end of second oil separator.
Second extraction equipment described in step 4) is equipped with No.1 input end, No. two input ends, No. three input ends, No. four imports
End, No.1 outlet end and No. two outlet ends, the No.1 input end of second extraction equipment and first extraction equipment
The connection of No.1 outlet end；No. two input ends of the No.1 outlet end of second extraction equipment and first extraction equipment connect
It is logical；No. four input ends of second extraction equipment are connected to No. two outlet ends of second extraction equipment.
First back extraction device described in step 5) is equipped with No.1 input end, No. two input ends, No.1 outlet end and two
The No.1 input end of number outlet end, the first back extraction device is connected to No. two outlet ends of first extraction equipment；Step
It is rapid 6) described in second back extraction device be equipped with No.1 outlet end, No. two outlet ends and No. three outlet ends, it is described second back extraction
The input end of device is connected to the No.1 outlet end of the first back extraction device；The No.1 outlet of the second back extraction device
End is connected to No. two input ends of the second extraction equipment, No. two outlet ends of the second back extraction device and first back extraction
No. two input ends of device are taken to be connected to, described second is stripped No. three of No. three outlet ends of device and second extraction equipment
Input end connection；Back extraction oil separator described in step 7) includes the first back extraction oil separator and the second back extraction oil separator, institute
The first back extraction oil separator is stated equipped with No.1 input end and No. two input ends, No. two outlet ends of the first back extraction device with
The No.1 input end connection of the first back extraction oil separator, No. three outlet ends and described first of the second back extraction device
It is stripped No. two input ends connection of oil separator, the outlet end of the first back extraction oil separator and the second back extraction oil removal
The input end in pond is connected to.
It respectively will treated that standard is given up containing specific embodiment 1-5 treated normal wastewater and containing comparative example 1-3
It is as shown in table 1 below that water carries out iron, aluminium content measurement result:
Table 1
From the above results, it can't detect iron content in the recovered liquid after processing in 1-5 of the embodiment of the present invention, and
And method processing sewage of the invention is high-efficient, not only reduces processing cost, and may be used also through handling hydrochloric acid after the recovery
To be back on production line, a large amount of Dephosphorization reagent will be consumed by avoiding conventional treatment and being discharged to sewage plant.
Compared with Example 1, the no addition hydrochloric acid before step 2) in hydrochloric acid pickling waste liquor processing of comparative example 1, it is right
It carries out iron content, pH value, suspended matter and oils using the recovered liquid after process described in comparative example 1 to test, discovery can be examined
Iron content is measured, pH value, suspended matter and oil content are apparently higher than in embodiment 1 and handle recovered liquid；Illustrate the present invention in hydrochloric acid
Iron content and suspended matter and oils etc. can be reduced well that hydrochloric acid is not added before step 2) when pickle liquor processing
The content of impurity.
Compared with Example 3, comparative example 2 extracts in the second extraction equipment without being added in hydrochloric acid pickling waste liquor processing
Agent is tested iron content, pH value, suspended matter and oils is carried out using the recovered liquid after process described in comparative example 2, and discovery can
To detect that iron content, suspended matter and oil content are apparently higher than in embodiment 3 and handle recovered liquid；Illustrate the present invention in hydrochloric acid acid
Extractant is added when washing liquid waste processing in the second extraction equipment can reduce iron content and suspended matter and oils etc. well
The content of impurity.
Compared with Example 5, the extractant used in hydrochloric acid pickling waste liquor processing of comparative example 3 has only used N235, to utilization
Recovered liquid after process described in comparative example 3, which carries out iron content, pH value, suspended matter and oils test, discovery, can detecte
Iron content, pH value, suspended matter and oil content are apparently higher than in embodiment 5 and handle recovered liquid；Illustrate the present invention in chlorohydric acid pickling
Extractant used can be with according to the mixture that mass ratio is 5:4:20 composition with N235, sec-octyl alcohol and space flight gasoline when liquid waste processing
The content of iron content and the impurity such as suspended matter and oils is reduced well.
Above-described embodiment is the preferable implementation of the present invention, and in addition to this, the present invention can be realized with other way,
Do not depart under the premise of present inventive concept it is any obviously replace it is within the scope of the present invention.
Claims (10)
1. a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor, characterized by the following steps:
1) pickle liquor gathered is obtained into the first treatment fluid after oil separator removes impurity；
2) second processing liquid will be obtained after the first treatment fluid obtained in step 1) and mixed in hydrochloric acid；
3) second processing liquid obtained in step 2) is obtained into third treatment fluid after the processing of the first extraction equipment；
4) third treatment fluid obtained in step 3) is obtained into fourth process liquid after the processing of the second extraction equipment；
5) fourth process liquid obtained in step 4) is obtained into the 5th treatment fluid after the first back extraction device processing；
6) the 5th treatment fluid obtained in step 5) is obtained into the 6th treatment fluid after the second back extraction device processing；
7) the 6th treatment fluid obtained in step 6) is obtained into the 7th treatment fluid after back extraction oil separator processing；
8) fourth process liquid obtained in step 7) and the 7th treatment fluid can be recycled after detection is up to standard for production line.
2. a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor according to claim 1, it is characterised in that: in step 2)
The volume ratio of first treatment fluid and hydrochloric acid is 6-10:2.
3. a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor according to claim 1, it is characterised in that: described first
Added with extractant in extraction equipment and the second extraction equipment, the extractant be by N235, sec-octyl alcohol and space flight gasoline according to
Mass ratio is the mixture of 4-5:3-4:2 composition.
4. a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor according to claim 1, it is characterised in that: in step 8)
The examination criteria of 7th treatment fluid is that water outlet hydrochloric acid is 2-3mol/L.
5. a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor according to claim 1, it is characterised in that: in step 1)
The oil separator includes the first oil separator and the second oil separator, the outlet end of first oil separator and second oil separator
Input end is connected.
6. a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor according to claim 1, it is characterised in that: in step 3)
First extraction equipment is equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends, first extraction
The No.1 input end of device and the outlet end of second oil separator is taken to be connected to.
7. a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor according to claim 1, it is characterised in that: in step 4)
Second extraction equipment be equipped with No.1 input end, No. two input ends, No. three input ends, No. four input ends, No.1 outlet end with
And No. two outlet ends, the No.1 input end of second extraction equipment are connected to the No.1 outlet end of first extraction equipment；
The No.1 outlet end of second extraction equipment is connected to No. two input ends of first extraction equipment；The second extraction dress
No. four input ends set are connected to No. two outlet ends of second extraction equipment.
8. a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor according to claim 1, it is characterised in that: in step 5)
It is described first back extraction device be equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends, described first
The No.1 input end of back extraction device is connected to No. two outlet ends of first extraction equipment.
9. a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor according to claim 1, it is characterised in that: in step 6)
The second back extraction device is equipped with No.1 outlet end, No. two outlet ends and No. three outlet ends, the second back extraction device
Input end is connected to the No.1 outlet end of the first back extraction device；The No.1 outlet end and the of the second back extraction device
No. two input ends of two extraction equipments are connected to, No. two outlet ends of the second back extraction device and the first back extraction device
No. two input ends connection, it is described second back extraction device No. three outlet ends and second extraction equipment No. three input ends
Connection.
10. a kind of recovery method of steel rolling mill's hydrochloric acid pickling waste liquor according to claim 1, it is characterised in that: step 5)
Described in first back extraction device be equipped with No.1 input end, No. two input ends, No.1 outlet end and No. two outlet ends；Step 6)
Described in second back extraction device be equipped with No.1 outlet end, No. two outlet ends and No. three outlet ends, it is described second back extraction device
Input end with it is described first back extraction device No.1 outlet end be connected to；It is described second back extraction device No.1 outlet end with
No. two input ends of the second extraction equipment are connected to, and No. two outlet ends of the second back extraction device and first back extraction fill
No. two input ends connection set, No. three outlet ends of the second back extraction device and No. three imports of second extraction equipment
End connection；Back extraction oil separator described in step 7) includes the first back extraction oil separator and the second back extraction oil separator, and described the
One back extraction oil separator be equipped with No.1 input end and No. two input ends, it is described first back extraction device No. two outlet ends with it is described
The No.1 input end connection of first back extraction oil separator, No. three outlet ends of the second back extraction device and first back extraction
No. two input ends of oil separator are taken to be connected to, the outlet end and described second of the first back extraction oil separator is stripped oil separator
Input end connection.
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