CN215592791U - Pickling iron rust effluent disposal system - Google Patents
Pickling iron rust effluent disposal system Download PDFInfo
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- CN215592791U CN215592791U CN202121572737.2U CN202121572737U CN215592791U CN 215592791 U CN215592791 U CN 215592791U CN 202121572737 U CN202121572737 U CN 202121572737U CN 215592791 U CN215592791 U CN 215592791U
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Abstract
The utility model relates to a pickling rust wastewater treatment system which is characterized by comprising an acid purification system, an iron ion recovery system and an ammonium chloride recovery system, wherein purified acid can be recycled, and iron ions are recycled.
Description
Technical Field
The utility model relates to a pickling rust wastewater treatment system.
Background
At present, iron piece metal surface treatment in the industries of electroplating, steel rolling and the like usually uses acid to remove surface iron scale before processing so as to better meet the requirements of advanced treatment such as corrosion prevention or attractiveness of a metal surface coating of the iron piece. In the traditional pickling process, when the iron ion content in the pickling tank reaches a certain concentration of about 11%, the pickling effect is remarkably reduced. It is common practice to replace the pickling solution with a new one and transfer the former pickling solution to a sewage station for sewage treatment. For example, the waste water of electroplating industry, which is called as one of three industrial difficult-to-treat waste water, is difficult to treat mainly because the waste water generates a large amount of dangerous waste sludge after being treated by a neutralization method. Even if the sludge is sent to a professional hazardous waste treatment mechanism, the sludge is not treated by an ideal method and is mostly solidified and deeply buried. The existing neutralization method treatment not only brings high environment-friendly operation cost to enterprises, but also causes a great amount of dangerous waste sludge without recovery value to be difficult to dispose, and simultaneously causes the iron resource to be seriously lost. At present, the country clearly proposes the direction of energy conservation and emission reduction for the electroplating industry to save, reduce and recycle resources, has extremely high requirements on new technologies, and also generates great environmental protection pressure for the current industries such as electroplating, steel rolling and the like. By analyzing the composition of the electroplating hazardous waste sludge, more than 95 percent of the sludge components are iron elements, and the balance is a small amount of heavy iron elements such as chromium, nickel, zinc and the like.
At present, two common treatment modes for treating the pickling iron rust wastewater of electroplating and steel rolling are provided, one mode is to treat the pickling iron rust wastewater with the pH value of more than 2 by reverse osmosis, because the acid-resistant pH value of the reverse osmosis is 2, the treatment mode cannot be used for treating the sewage with the pH value of less than 2, however, in order to achieve the effect of removing rust on the metal surface of an iron piece in a short time by the existing pickling process, a high-concentration pickling solution is usually adopted, for example, a pickling tank in the electroplating industry usually adopts a 14-17% hydrochloric acid solution as a cleaning solution, so that the application of a reverse osmosis system to the treatment of the pickling wastewater has great limitation; the other method is to use alkali to neutralize acid in the pickling solution, and iron and other iron ions are combined with hydroxide radical to produce precipitate, and the treatment method can treat the wastewater with high acid content, but needs to consume a large amount of alkali to neutralize acid in the pickling rust wastewater, thereby causing waste of alkali and acid and having the problem of high production cost.
There is currently no effective and cost effective method for treating spent acid from rust pickling at high acid content, pH below 1, and which requires a reduction in acid waste and alkali consumption.
Disclosure of Invention
The utility model provides a system and a method for treating pickling iron rust waste acid, which solve the technical problems of treating pickling iron rust waste acid with the concentration of more than 10 percent, and require to reduce the consumption of acid and alkali and reduce the production cost.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a pickling rust wastewater treatment system comprises an acid purification system, an iron ion recovery system and an ammonium chloride recovery system;
the acid purification system is used for purifying waste acid;
the acid is hydrochloric acid;
the iron ion recovery system is used for recovering iron ions in waste acid;
the ammonium chloride recovery system is used for recovering ammonium chloride generated by the system.
The acid purification system comprises a waste acid pool, a precision filter and an acid-resistant nanofiltration system; the iron ion recovery system comprises a concentrated solution collecting tank, a regulating tank and a sludge dewatering system; the ammonium chloride recovery system comprises a pH adjusting tank, a reverse osmosis system, a water production tank and an ammonium chloride solution collecting box.
The waste acid tank is used for storing waste acid generated by the pickling production line;
the precision filter is used for removing impurities with the particle size of 1 mu m in the waste acid;
the acid-resistant nanofiltration system is used for removing iron ions;
the concentrated solution collecting tank is used for storing iron ion concentrated solution;
the adjusting tank is used for adjusting sewage;
the reverse osmosis system is used for concentrating an ammonium chloride solution;
the ultrafiltration system is used for separating ferric hydroxide precipitate and solution;
the sludge dewatering system is used for separating sludge and water;
the pH adjusting tank is used for adjusting pH;
the water production tank is a permeate liquid water storage collection box of the reverse osmosis process of the ammonium chloride recovery system;
the ammonium chloride solution collecting box is an ammonium chloride concentrated solution generated by a reverse osmosis process in an ammonium chloride recovery system;
the iron ion concentration of the acid-washing rust waste acid is 10-12 g/L, and the acid content is 10% -20%;
the precision filter is a bag type or polypropylene melt-blown filter element type precision filter, and the shell is made of polypropylene or polyethylene acid-resistant plastic.
The regulating tank is divided into a regulating tank 1 and a regulating tank 2;
the regulating tank 1 is used for oxidizing ferrous ions into ferric ions;
the adjusting tank 2 is used for adjusting the pH.
The device also comprises an iron ion online monitor and an acidity monitor;
the iron ion online monitor is used for monitoring iron ions in the wastewater;
the acidity monitor is used for monitoring the acidity of the wastewater.
A treatment method of an acid pickling rust wastewater treatment system,
1) pumping the pickling iron rust waste acid in the waste acid pool into a precision filter for removing impurities to obtain pretreated waste acid;
2) pumping the pretreated waste acid into an acid-resistant nanofiltration system through an acid-resistant high-pressure pump, and separating iron ions from acid to obtain purified acid and an iron ion concentrated solution;
3) collecting the iron ion concentrated solution into a concentrated solution collecting tank;
4) pumping the iron ion concentrated solution in the concentrated solution collecting tank into a regulating tank 1, pumping hydrogen peroxide into the regulating tank 1 through a metering pump, controlling the adding amount of the hydrogen peroxide through an online ORP detector, and stopping the metering pump when the OPR value reaches 300 mV;
5) pumping the oxidized concentrated solution in the regulating tank 1 into a regulating tank 2, and introducing ammonia water into the regulating tank 2 to ensure that the pH value of the concentrated solution in the regulating tank 2 is 3.5-4.0;
6) separating ferric hydroxide and weak acid from the concentrated solution with the pH adjusted in the adjusting tank 2 by an ultrafiltration system to obtain weak acid washing liquid and ferric hydroxide suspension, and returning the weak acid washing liquid to the acid washing production line for recycling;
7) dehydrating the ferric hydroxide suspension to obtain iron mud and water; and returning the produced water to the pickling production line.
The operation pressure of the acid-resistant nanofiltration system in the step 2) is 0.7-1.5 MPa.
And in the step 7), the dehydration is performed by adopting a plate-and-frame filter press for filter pressing dehydration or centrifugal dehydration by adopting a centrifugal machine.
Returning the purified acid in the step 2) to an acid washing production line.
When the concentration of ammonium chloride in acid used in the acid washing process section is more than 4g/L, adding ammonia water into the purified acid obtained in the step 2), adjusting the pH value to 6.0-6.5, performing reverse osmosis concentration, collecting ammonium chloride, and returning the obtained product water to the acid washing production line.
The utility model has the following beneficial technical effects:
1. the acid-resistant nanofiltration is applied to the treatment of waste acid with the acid concentration of 10-20%, so that the consumption of acid can be reduced, and the waste of alkali can be reduced.
2. The purification of high concentration waste acid is realized to the acidproof nanofiltration technique of low pressure high flux that this application utilizes, and the iron ion concentrate passes through the oxidation regulating reservoir earlier and becomes ferric ion with the oxidation of ferrous ion, then adjusts with the aqueous ammonia, adjusts ferric ion and changes ferric ion into the ferric hydroxide deposit, realizes the resource recovery of iron ion through plate and frame filter press after adjusting twice.
3. The method controls the concentration of ammonium chloride in the returned acid, and can ensure the lasting pickling effect of the pickling process.
4. The water produced by the method is directly returned to the pickling section after being treated, and no wastewater is produced.
Drawings
FIG. 1 is a flow chart of a pickling rust wastewater treatment system.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1
A pickling rust wastewater treatment system comprises an acid purification system, an iron ion recovery system and an ammonium chloride recovery system;
the acid purification system is used for purifying waste acid;
the acid is hydrochloric acid;
the iron ion recovery system is used for recovering iron ions in waste acid;
the ammonium chloride recovery system is used for recovering ammonium chloride generated by the system.
The acid purification system comprises a waste acid pool, a precision filter and an acid-resistant nanofiltration system; the iron ion recovery system comprises a concentrated solution collecting tank, a regulating tank and a sludge dewatering system; the ammonium chloride recovery system comprises a pH adjusting tank, a reverse osmosis system, a water production tank and an ammonium chloride solution collecting box.
The waste acid tank is used for storing waste acid generated by the pickling production line;
the precision filter is used for removing impurities with the particle size of 1 mu m in the waste acid;
the acid-resistant nanofiltration system is used for removing iron ions;
the concentrated solution collecting tank is used for storing iron ion concentrated solution;
the adjusting tank is used for adjusting sewage;
the reverse osmosis system is used for concentrating an ammonium chloride solution;
the ultrafiltration system is used for separating ferric hydroxide precipitate and solution;
the sludge dewatering system is used for separating sludge and water;
the pH adjusting tank is used for adjusting pH;
the water production tank is a permeate liquid water storage collection box of the reverse osmosis process of the ammonium chloride recovery system;
the ammonium chloride solution collecting box is an ammonium chloride concentrated solution generated by a reverse osmosis process in an ammonium chloride recovery system;
the iron ion concentration of the acid-washing rust waste acid is 10-12 g/L, and the acid content is 10% -20%;
the precision filter is a bag type or polypropylene melt-blown filter element type precision filter, and the shell is made of polypropylene or polyethylene acid-resistant plastic.
The regulating tank is divided into a regulating tank 1 and a regulating tank 2;
the regulating tank 1 is used for oxidizing ferrous ions into ferric ions;
the adjusting tank 2 is used for adjusting the pH.
The device also comprises an iron ion online monitor and an acidity monitor;
the iron ion online monitor is used for monitoring iron ions in the wastewater;
the acidity monitor is used for monitoring the acidity of the wastewater.
The acid pickling rust wastewater treatment system operates according to the following steps:
the pickling tank is used for treating the hot galvanizing pickling tank and the waste acid pickling tank on line, the initial acid preparation is hydrochloric acid aqueous solution with the mass concentration of 15%, the plated part is soaked in the pickling tank for 20min, and the pickling effect is detected by an operator according to ISO 1461-2009 standard of metal covering layer-steel product hot galvanizing coating. The study of this example is to examine the purification process of waste acid in pickling treatment of metal surface of iron member with hydrochloric acid concentration of 14% and iron ion concentration of 11.25g/L in pickling tank.
Waste acid purification system:
step 1, firstly pumping the waste acid into a waste acid buffer pool of the integrated equipment through a lifting pump at the beginning of operation of the embodiment;
step 2, pumping waste acid in the waste acid tank into a precision filter (the filtration precision is 1 mu m) through a booster pump for filtration to obtain pretreated waste acid;
step 3, pumping the pretreated waste acid into an acid-resistant nanofiltration system through an acid-resistant high-pressure pump, and adjusting the pressure of the acid-resistant high-pressure pump to 1Mpa to obtain purified acid and iron ion concentrated solution;
has the advantages that: acid-resistant nanofiltration systemThe water yield can reach 40%, the filtered acid liquor returns to a hot galvanizing pickling tank for reuse through a pipeline, and the iron ion concentrated solution enters a concentrated solution collecting tank for collection. The concentration of iron ions in the permeate after the first-stage acid-resistant nanofiltration is 1.14g/L, the removal efficiency of the iron ions is 89.9 percent, and a single membrane element (the effective area is 10 m)2) The water yield at this 1MPa operating pressure was (0.45 m)3/h)。
Iron ion recovery system:
step 4, acid-resistant nanofiltration concentrated solution, namely when the concentration of iron ions in the iron ion concentrated solution reaches 18g/L, the concentrated solution enters a concentrated solution collecting tank,
and 5, overflowing the iron ion concentrated solution to the regulating tank 1 through an overflow pipe, pumping hydrogen peroxide through a metering pump, stirring, stopping the metering pump and continuing stirring for 30min when the online oxidation potential reaches 300mv, wherein waste acid in the regulating tank is in a typical reddish brown color of ferric ions.
And 6, transferring the waste acid in the regulating tank 1 to a pH regulating tank through a lifting pump, pumping ammonia water into the regulating tank through a metering pump, quickly stirring the mixture, stopping the metering pump when the online pH value is within the range of 3.5-4.0, and continuously stirring the mixture for 30 min.
And 7, pumping the waste acid in the pH adjusting tank into an ultrafiltration system through a booster pump, separating ferric hydroxide from weak acid to obtain weak acid washing liquid and ferric hydroxide suspension, returning the weak acid washing liquid to an acid washing tank production line through a pipeline, and enabling the ferric hydroxide suspension to enter an iron mud dehydration system.
And 8, feeding the ferric hydroxide suspension into a sludge tank, pumping the ferric hydroxide suspension into a plate-and-frame filter press through a screw pump, and filtering the filter cloth with the filtering precision of 350 meshes. And returning the effluent of the plate frame system to the production line of the pickling tank for recycling, and collecting sludge, wherein the water content of the iron mud is about 65 percent.
Ammonium chloride recovery system:
and 9, the concentration of ammonium chloride in the pickling tank production line is gradually increased along with the continuous operation of the iron ion recovery system, and when the concentration of the ammonium chloride reaches 4g/L, the filtrate of the acid-resistant nanofiltration system does not directly return to the pickling tank production line through a pipeline, but enters an adjusting tank of the ammonium chloride recovery system.
And 10, adding ammonia water into an adjusting tank of an ammonium chloride recovery system through a metering pump to adjust the pH, adjusting the pH to 6.0-6.5, and then feeding the solution into a reverse osmosis system to concentrate and recover ammonium chloride.
And 11, returning the produced water of the ammonium chloride recovery reverse osmosis system to the production line of the pickling tank, and independently collecting and recycling the ammonium chloride concentrated solution.
The system device is formed by connecting 3 acid-resistant nanofiltration membrane elements in parallel, and the effluent of the system is 1.35m3The effective volume of a pickling tank of a project implementation workshop is 50m3After 3 days of continuous operation (24 hours) without stopping the production, the iron ion concentration in the pickling tank can be reduced to 1.22 g/L.
Claims (4)
1. The acid pickling rust wastewater treatment system is characterized by comprising an acid purification system, an iron ion recovery system and an ammonium chloride recovery system;
the acid purification system is used for purifying waste acid;
the iron ion recovery system is used for recovering iron ions in waste acid;
the ammonium chloride recovery system is used for recovering ammonium chloride generated by the system;
the acid purification system, the iron ion recovery system and the ammonium chloride recovery system are sequentially connected;
the acid purification system comprises a waste acid pool, a precision filter and an acid-resistant nanofiltration system; the iron ion recovery system comprises a concentrated solution collecting tank, an adjusting tank, an ultrafiltration system and a sludge dewatering system; the ammonium chloride recovery system comprises a pH adjusting tank, a reverse osmosis system, a water production tank and an ammonium chloride solution collecting box;
the connection relationship of the waste acid pool, the precision filter and the acid-resistant nanofiltration system in the acid purification system is sequentially connected in series;
the concentrated solution collecting tank, the adjusting tank and the sludge dewatering system in the iron ion recovery system are connected in series in sequence;
the pH adjusting tank and the reverse osmosis system are connected in series;
the water producing tank and the ammonium chloride solution collecting tank are connected in parallel.
2. The pickling rust wastewater treatment system of claim 1,
the waste acid tank is used for storing waste acid generated by the pickling production line;
the precision filter is used for removing impurities with the particle size of 1 mu m in the waste acid;
the acid-resistant nanofiltration system is used for removing iron ions;
the concentrated solution collecting tank is used for storing iron ion concentrated solution;
the adjusting tank is used for adjusting sewage;
the reverse osmosis system is used for concentrating an ammonium chloride solution;
the ultrafiltration system is used for separating ferric hydroxide precipitate and solution;
the sludge dewatering system is used for separating sludge and water;
the pH adjusting tank is used for adjusting pH;
the water production tank is a permeate liquid water storage collection box of the reverse osmosis process of the ammonium chloride recovery system;
the ammonium chloride solution collecting box is an ammonium chloride concentrated solution generated by a reverse osmosis process in an ammonium chloride recovery system;
the precision filter is a bag type or polypropylene melt-blown filter element type precision filter, and the shell is made of polypropylene or polyethylene acid-resistant plastic.
3. The acid pickling rust wastewater treatment system according to claim 2, wherein the conditioning tank is divided into a conditioning tank 1 and a conditioning tank 2;
the regulating tank 1 is used for oxidizing ferrous ions into ferric ions;
the adjusting tank 2 is used for adjusting the pH.
4. The pickling iron rust wastewater treatment system of claim 1, further comprising an iron ion online monitor and an acidity monitor;
the iron ion online monitor is used for monitoring iron ions in the wastewater;
the acidity monitor is used for monitoring the acidity of the wastewater.
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| CN202121572737.2U CN215592791U (en) | 2021-07-12 | 2021-07-12 | Pickling iron rust effluent disposal system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477546A (en) * | 2022-02-16 | 2022-05-13 | 莱特莱德(上海)技术有限公司 | Device and method for recycling steel pickling wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477546A (en) * | 2022-02-16 | 2022-05-13 | 莱特莱德(上海)技术有限公司 | Device and method for recycling steel pickling wastewater |
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Effective date of registration: 20220420 Address after: 315194 room 403-8, No. 221, Tiangao lane, Shounan street, Yinzhou District, Ningbo City, Zhejiang Province Patentee after: Zhejiang Huisheng Hengde Environmental Technology Co.,Ltd. Address before: 272000 Building 8, energy conservation and environmental protection industrial park, Jiaxin Road, tuanli Town, Jining Economic Development Zone, Jining City, Shandong Province Patentee before: Shandong granke environmental protection new material Co.,Ltd. |
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