CN103924253B - A kind of stainless steel acid cleaning waste water heavy metal and fluorochemical recovery method - Google Patents
A kind of stainless steel acid cleaning waste water heavy metal and fluorochemical recovery method Download PDFInfo
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- CN103924253B CN103924253B CN201410158818.6A CN201410158818A CN103924253B CN 103924253 B CN103924253 B CN 103924253B CN 201410158818 A CN201410158818 A CN 201410158818A CN 103924253 B CN103924253 B CN 103924253B
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Abstract
The invention discloses a kind of stainless steel acid cleaning waste water heavy metal and fluorochemical recovery method, the present invention is by first stainless steel acid cleaning waste water being carried out oil removal pre-treatment, then by a heavy pond sedimentation, carry out recyclable iron powder after press filtration, middle temperature reduction treatment to the solid materials after sedimentation again; Then by ion-exchange, NiCl is obtained to the clear liquid in a heavy pond
2; Then again secondary settlement is carried out to the concentrated solution after ion-exchange, Calcium Fluoride (Fluorspan) material can be obtained equally, and recycling relief liquor.Advantage of the present invention is: stainless steel waste water can be made to realize zero release by method of the present invention, and processing cost is lower, and the input of process fixture is less, even can realize on the basis of existing installation.The present invention can be widely used in enterprises of producing stainless steel.
Description
Technical field
The present invention relates to a kind of chemical treatment method, specifically refer to that a kind of heavy metal of the stainless steel acid cleaning waste water produced in enterprises of producing stainless steel and fluorochemical carry out recoverying and utilizing method.
Background technology
The process of existing stainless steel acid cleaning waste water adopts substantially: the method for aeration, neutralization, precipitation, the heavy metal recovery in waste water is not considered due to traditional method, just think of processing qualified discharge, so overall operation high cost, and the mud pressed dry often easily causes heavy metal secondary pollution due to mishandling, the more important thing is and can cause the wasting of resources.Containing a large amount of iron, chromium, nickel salt in stainless steel acid waste water.At present, enterprise generally by acid waste water process to meeting emission standard, namely discharged, but such discharge still has very large problem, one be iron wherein, chromium, nickel salt form secondary pollution along with discharge, two is current enterprises is discharge in the treating processes of carrying out, and uses alkali lye in a large number, the consumption of medicament is also very large, and Financial cost is larger.Carry out wastewater treatment so how to reduce costs, the appearance of secondary pollution can be avoided simultaneously, become the important subject of enterprise.
Contriver Wang Tao, Tian Yuling, in the invention [ZL200410005161.6.] of metallurgical industry cold rolling acid waste water process neutralizing agent and processing method thereof, disclose a kind of metallurgical industry cold rolling acid waste water process neutralizing agent and processing method thereof.It is characterized in that: acid waste water process neutralizing agent is: light-burning magnesium powder oversize is through Raymond machine grinding particle size 100-140 order, electric-fused magnesium dedusting ash, light-burning magnesium powder and the magnesium based material of content more than 40%.Its processing method comprises the following steps: 1) supply acid waste water to preaeration tank and carry out empty aeration; 2) sky expose to the sun after acid waste water enter neutralization reaction pond; 3) neutralizing agent is supplied to neutralization reaction pond; 4) neutralization reaction divides three kinds of modes: stir and add aeration, mechanical stirring, separately aeration; 5) horizontal flow basin precipitation; 6) mud-water separation process is filtered.The invention provides that one can produce direct economic benefit, reduced investment, working cost are low, process device structure is simple, and management easy to operate, neutralizing agent wide material sources, utilize three wastes resource, the treatment of wastes with processes of wastes against one another.Cancel the new water consumption of milk of lime technique, realize the up-to-date neutralizing agent material of Treated sewage reusing, processing method and equipment.
Zhou Zengyan, " research of two-stage aeration neutralization process process pickling waste waters and engineer applied " that Zhou Gengwu writes, this article has set forth the technical scheme of trade effluent being carried out dual treatment by pickling waste waters and spent pickle liquor, and according to the water quality characteristics of pickling waste waters, determine the treatment process of two-stage aeration neutralization process as pickling waste waters, not only in theory this technique is inquired into, and select in conjunction with the result of simulation test and determine process control parameter, complete engineering design and the engineering construction of industrial effluent treatment plant on this basis further; Engineering debug result shows that this technique is remarkable to the removal effect of pollutent in pickling waste waters, and water outlet meets emission request and reuse, and body refuse outward transport brickmaking gets utilization, process program reasonable.
The treatment process [CN200610086207.0] of the waste water of steel iron acid cleaning of week Pan Yue, this invention relates to waste water treatment process technical field, especially a kind of to steel pickling waste liquor removal acid group and iron ion, realizes the treatment process of waste water recycling.Include outside the technological process of neutralization, precipitation, also there is the process waste water containing ferrous ion of discharging after precipitation being continued to process; Circulation contact oxidation is that the waste water of discharging after neutralization precipitation is passed into circulation contact oxidation device, makes the ferrous ion be dissolved in waste water become water-fast ferric ion with water with oxygen reaction after contact oxidation; Again through secondary sedimentation, the ferric iron in waste water is precipitated completely, discharge clear water reuse.This invention can not only remove the acid group in pickling waste waters, and can remove the iron ion in waste water, realizes waste water recycling, reaches zero release.
The steel pickling waste liquor process of week Pan Yue invention is with circulation contact oxidation device [200620075743.6], and this utility model relates to sewage treatment equipment technical field, especially a kind of circulation contact oxidation device steel pickling waste liquor being removed to iron ion process.Include container body, aerator, spraying defoaming device, exhaust water-recovering device; Spraying defoaming device be positioned at container body top, communicate with container body, on the top of spraying defoaming device, exhaust water-recovering device is also installed, exhaust water-recovering device communicate with spraying defoaming device, aerator is placed in container body inside; Water-in is arranged at container body top, dewatering outlet is arranged at bottom; The foam overflow that the aerating wastewater of aerator in circulation contact oxidation device to inside produces is in spraying defoaming device, to be undertaken going out bubble process by spraying defoaming device, the exhaust water-recovering device on spraying defoaming device top can while discharging internal gas, prevent the spilling of waste water.And circulation contact oxidation device for acid cleaning waste water treatment [200610086206.6.], this invention relates to sewage treatment equipment technical field, especially a kind of circulation contact oxidation device steel pickling waste liquor being removed to iron ion process.Include container body, aerator, spraying defoaming device, exhaust water-recovering device; Spraying defoaming device be positioned at container body top, communicate with container body, on the top of spraying defoaming device, exhaust water-recovering device is also installed, exhaust water-recovering device communicate with spraying defoaming device, aerator is placed in container body inside; Water-in is arranged at container body top, dewatering outlet is arranged at bottom; The foam overflow that the aerating wastewater of aerator in circulation contact oxidation device to inside produces is in spraying defoaming device, to be undertaken going out bubble process by spraying defoaming device, the exhaust water-recovering device on spraying defoaming device top can while discharging internal gas, prevent the spilling of waste water.
And applicant had also once carried out large quantity research to the process of stainless steel acid cleaning waste water, former achievement in research, had mostly been by the harmless treatment of stainless steel acid cleaning waste water, do not reach completely do not discharge, the effect such as the recycling of refuse.
But the acid waste water that above-mentioned patent or disclosed technical literature are all failed in solution producing stainless steel process carries out comprehensive treating process, and can realize the problems such as suitability for industrialized production.
Summary of the invention
The present invention is directed to deficiency of the prior art, propose and better can realize the recycling of waste water, realize the effect of zero release, and by the change to the different operating condition of original technical scheme, better realize object of the present invention.
The present invention is achieved by following technical proposals:
A kind of stainless steel acid cleaning waste water heavy metal and fluorochemical recovery method, is characterized in that comprising the steps:
(1) stainless steel acid cleaning waste water is carried out pre-treatment through oil removal equalizing tank; Oil trap in this step is the common equipment in wastewater treatment industry, and the present invention also adopts common equipment, removes the oils of some routines, as the use of preliminary filtration;
(2) through the pretreated feed liquid Na of oil removal equalizing tank
2cO
3or phosphoric acid adjust ph in a heavy pond, to slightly acidic, and carries out first time sedimentation; Owing to there are a large amount of acidic substance in stainless steel acid cleaning waste water, contriver is found by a large amount of experiments, acid power can have a strong impact on object of the present invention and realize, so adjust ph is an important step to certain scope, and the conditioning agent used also has larger difference, Na adopted in the present invention
2cO
3it is the material with better effects done after contriver selects.
(3) solids after first time sedimentation is adjusted to pH3-4 at readjustment pond hydrochloric acid, and then carry out concentrated press filtration process by the feed liquid in readjustment pond, filtrate after press filtration returns in a heavy pond, the filter mud after press filtration process through in after warm reduction treatment, can Iron concentrate be obtained; In this step, it is also determine for the composition in stainless steel acid cleaning waste water that hydrochloric acid regulates, and because the technology of contriver's middle temperature reduction treatment of this patent has open in patent 201210063087.8, therefore specifically not auspiciously within this document to state; Meanwhile, the recycling completely of this patent is achieved, be also to a certain extent based on have middle temperature reduce patent exist for basis;
The clear liquid obtained after first time sedimentation is through ion-exchange, and the washings obtained returns the reuse of oil removal equalizing tank; Concentrated solution after ion-exchange is NiCl
2; Institute obtains NiCl
2generation economic worth can be taken out;
(4) regenerated liquid after ion-exchange uses CaCl again in second pond
2regulate pH to 6.0, the secondary clear liquid produced directly discharges or reuse;
Filtrate after second pond carries out concentrated press filtration, and the filter cake produced is that Calcium Fluoride (Fluorspan) Product recycling utilizes; Filtrate after press filtration returns in second pond.
So the process to stainless steel acid cleaning waste water from aforementioned whole process, can realize harmless discharge completely, and the recycling of objectionable impurities.The operation of the present invention through Songyang in Zhejiang Province stainless steel production base is tried, and by recycling being made up of material, can realize the bumper harvests of economic benefit, social benefit for the expense dropped into.
As preferably, in the step (2) of above-mentioned a kind of stainless steel acid cleaning waste water heavy metal and fluorochemical recovery method, use Na
2cO
3adjust ph to 5.4 in a heavy pond.
As preferably, in the step (3) of above-mentioned a kind of stainless steel acid cleaning waste water heavy metal and fluorochemical recovery method, solids is adjusted to pH3.2 at readjustment pond hydrochloric acid.
As preferably, from second pond filtrate out first through sludge thickener process in the step (4) of above-mentioned a kind of stainless steel acid cleaning waste water heavy metal and fluorochemical recovery method, then carry out press filtration.
Various Selecting parameter in the present invention are the optimization of contriver by the basis of great many of experiments is made, and have the factors such as better cost control, treatment effect.
Beneficial effect: stainless steel waste water can be made to realize zero release by method of the present invention, and processing cost is lower, the input of process fixture is less, even can realize on the basis of existing installation.
Accompanying drawing explanation
Fig. 1 treatment process schematic diagram of the present invention
Embodiment
Below in conjunction with accompanying drawing, enforcement of the present invention is illustrated:
Embodiment 1
By the 100 tons of stainless steel acid cleaning waste waters collected, first stainless steel acid waste water is sent into oil trap, remove the oils thing in waste water; Then a heavy pond is put into by having carried out pretreated stainless steel acid cleaning waste water, and with volume pump by Na
2cO
3adjust ph to 5.4 in a heavy pond, stops 6 hours at equalizing tank; Solids after first time sedimentation is adjusted to pH3 at readjustment pond hydrochloric acid, and then carry out press filtration process by the feed liquid in readjustment pond, filtrate after press filtration returns in a heavy pond carries out reuse, the filter mud after press filtration process through in after warm reduction treatment, can Iron concentrate be obtained; These Iron concentrate have reached the quality of sale;
Meanwhile, the clear liquid obtained after first time sedimentation is through ion-exchange, and the washings obtained returns the reuse of oil removal equalizing tank; Concentrated solution after ion-exchange is NiCl
2; Ion-exchange is herein conventional ion-exchange, as long as reach NiCl
2carry out reclaiming, then can by gained NiCl
2sell;
Again the regenerated liquid after ion-exchange is used CaCl again in second pond
2regulate pH to 6.0, the secondary clear liquid produced directly discharges or reuse; Process water requirement and emission standard are met;
Filtrate after second pond carries out press filtration, and the filter cake produced is that Calcium Fluoride (Fluorspan) Product recycling utilizes; Filtrate after press filtration returns in second pond.
Outer row after whole process implementation non-secondary pollution, gained regenerant is all the Industrial products with real economy value.
Embodiment 2
The processing step identical with embodiment 1, by the 100 tons of stainless steel acid cleaning waste waters collected, first sends stainless steel acid waste water into oil trap, removes the oils thing in waste water; Then a heavy pond is put into by having carried out pretreated stainless steel acid cleaning waste water, and with volume pump by Na
2cO
3adjust ph to 5.4 in a heavy pond, stops 6 hours at equalizing tank; Solids after first time sedimentation is adjusted to pH3.2 at readjustment pond hydrochloric acid, and then carry out press filtration process by the feed liquid in readjustment pond, filtrate after press filtration returns in a heavy pond carries out reuse, the filter mud after press filtration process through in after warm reduction treatment, can Iron concentrate be obtained; These Iron concentrate have reached the quality of sale;
Meanwhile, the clear liquid obtained after first time sedimentation is through ion-exchange, and the washings obtained returns the reuse of oil removal equalizing tank; Concentrated solution after ion-exchange is NiCl
2; Ion-exchange is herein conventional ion-exchange, as long as reach NiCl
2carry out reclaiming, then can by gained NiCl
2sell;
Again the regenerated liquid after ion-exchange is used CaCl again in second pond
2regulate pH to 6.0, the secondary clear liquid produced directly discharges or reuse; Process water requirement and emission standard are met;
Filtrate after second pond carries out press filtration, and the filter cake produced is that Calcium Fluoride (Fluorspan) Product recycling utilizes; Filtrate after press filtration returns in second pond.
Embodiment 3
Similar to embodiment 1, by the 100 tons of stainless steel acid cleaning waste waters collected, first stainless steel acid waste water is sent into oil trap, remove the oils thing in waste water; Then a heavy pond is put into by having carried out pretreated stainless steel acid cleaning waste water, and with volume pump by Na
2cO
3adjust ph to 5.4 in a heavy pond, stops 6 hours at equalizing tank; Solids after first time sedimentation is adjusted to pH3.8 at readjustment pond hydrochloric acid, and then carry out press filtration process by the feed liquid in readjustment pond, filtrate after press filtration returns in a heavy pond carries out reuse, the filter mud after press filtration process through in after warm reduction treatment, can Iron concentrate be obtained; These Iron concentrate have reached the quality of sale;
Meanwhile, the clear liquid obtained after first time sedimentation is through ion-exchange, and the washings obtained returns the reuse of oil removal equalizing tank; Concentrated solution after ion-exchange is NiCl
2; Ion-exchange is herein conventional ion-exchange, as long as reach NiCl
2carry out reclaiming, then can by gained NiCl
2sell;
Again the regenerated liquid after ion-exchange is used CaCl again in second pond
2regulate pH to 6.0, the secondary clear liquid produced directly discharges or reuse; Process water requirement and emission standard are met;
From second pond filtrate out first through sludge thickener process, more preferably press filtration below can prepare, with the work-ing life etc. being beneficial to filtering equipment, and then carry out press filtration.Filtrate after press filtration returns in second pond.
Equally, the outer row after whole process implementation non-secondary pollution, gained regenerant is all have real economy valency
The Industrial products of value.
Embodiment 4
Similar to embodiment 1, by the 100 tons of stainless steel acid cleaning waste waters collected, first stainless steel acid waste water is sent into oil trap, remove the oils thing in waste water; Then put into a heavy pond by having carried out pretreated stainless steel acid cleaning waste water, and with volume pump by waste phosphoric acid (making full use of) adjust ph to 5.4 in a heavy pond, stop 6 hours at equalizing tank; Solids after first time sedimentation is adjusted to pH3.8 at readjustment pond hydrochloric acid, and then carry out press filtration process by the feed liquid in readjustment pond, filtrate after press filtration returns in a heavy pond carries out reuse, the filter mud after press filtration process through in after warm reduction treatment, can Iron concentrate be obtained; These Iron concentrate have reached the quality of sale;
Meanwhile, the clear liquid obtained after first time sedimentation is through ion-exchange, and the washings obtained returns the reuse of oil removal equalizing tank; Concentrated solution after ion-exchange is NiCl
2; Ion-exchange is herein conventional ion-exchange, as long as reach NiCl
2carry out reclaiming, then can by gained NiCl
2sell;
Again the regenerated liquid after ion-exchange is used CaCl again in second pond
2regulate pH to 6.0, the secondary clear liquid produced directly discharges or reuse; Process water requirement and emission standard are met;
From second pond filtrate out first through sludge thickener process, more preferably press filtration below can prepare, with the work-ing life etc. being beneficial to filtering equipment, and then carry out press filtration.Filtrate after press filtration returns in second pond.
Equally, the outer row after whole process implementation non-secondary pollution, gained regenerant is all have real economy valency
The Industrial products of value.
Claims (3)
1. stainless steel acid cleaning waste water heavy metal and a fluorochemical recovery method, is characterized in that comprising the steps:
(1) stainless steel acid cleaning waste water is carried out pre-treatment through oil removal equalizing tank;
(2) through the pretreated feed liquid Na of oil removal equalizing tank
2cO
3or phosphoric acid adjust ph in a heavy pond, to slightly acidic, and carries out first time sedimentation;
(3) solids after first time sedimentation is adjusted to pH3-4 at readjustment pond hydrochloric acid, then concentrated press filtration process is carried out to the feed liquid in readjustment pond, filtrate after press filtration returns in a heavy pond, the filter mud after press filtration process through in after warm reduction treatment, can Iron concentrate be obtained;
The clear liquid obtained after first time sedimentation is through ion-exchange, and the washings obtained returns the reuse of oil removal equalizing tank; Concentrated solution after ion-exchange is NiCl
2;
(4) regenerated liquid after ion-exchange uses CaCl again in second pond
2regulate pH to 6.0, the secondary clear liquid produced directly discharges or reuse;
Filtrate after second pond carries out concentrating, press filtration, and the filter cake produced is that Calcium Fluoride (Fluorspan) product is recycled; Filtrate after press filtration returns in second pond.
2. a kind of stainless steel acid cleaning waste water heavy metal according to claim 1 and fluorochemical recovery method, is characterized in that using Na in step (2)
2cO
3adjust ph to 5.4 in a heavy pond.
3. a kind of stainless steel acid cleaning waste water heavy metal according to claim 1 and fluorochemical recovery method, is characterized in that in step (3), solids is adjusted to pH3.2 at readjustment pond hydrochloric acid.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101648759A (en) * | 2009-09-01 | 2010-02-17 | 浙江大学 | Recycling processing method for wastewater produced by processing stainless steel |
| CN101875518A (en) * | 2010-07-01 | 2010-11-03 | 陈启松 | Treatment method of stainless steel pickling waste water |
| CN102381748A (en) * | 2011-09-22 | 2012-03-21 | 陈启松 | Method for reducing content of sludge chromate nickel by utilizing acid to adjust back during stainless steel wastewater treatment |
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2014
- 2014-04-18 CN CN201410158818.6A patent/CN103924253B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101648759A (en) * | 2009-09-01 | 2010-02-17 | 浙江大学 | Recycling processing method for wastewater produced by processing stainless steel |
| CN101875518A (en) * | 2010-07-01 | 2010-11-03 | 陈启松 | Treatment method of stainless steel pickling waste water |
| CN102381748A (en) * | 2011-09-22 | 2012-03-21 | 陈启松 | Method for reducing content of sludge chromate nickel by utilizing acid to adjust back during stainless steel wastewater treatment |
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| CN103924253A (en) | 2014-07-16 |
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Effective date of registration: 20150715 Address after: 323400 Songyang County Industrial Park, Zhejiang, Lishui Applicant after: Songyang County Zhong Qi Genie et Environnement Address before: 310011, Zhejiang, Xihu District, West Lake science and Technology Park, Zhenhua West Road, Hong Kong, 8 New Territories, block E, 601, Hangzhou Applicant before: Chen Qisong |
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