CN108554186B - Chemical cleaning method for industrial wastewater reverse osmosis membrane - Google Patents
Chemical cleaning method for industrial wastewater reverse osmosis membrane Download PDFInfo
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- CN108554186B CN108554186B CN201711402322.9A CN201711402322A CN108554186B CN 108554186 B CN108554186 B CN 108554186B CN 201711402322 A CN201711402322 A CN 201711402322A CN 108554186 B CN108554186 B CN 108554186B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/162—Use of acids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/164—Use of bases
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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
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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Abstract
The invention discloses a chemical cleaning method for a reverse osmosis membrane of industrial wastewater, which comprises an alkali washing link and an acid washing link, wherein an alkaline agent with the pH value of 11-11.5 is adopted in the alkali washing link; the pH value of an acid pickling agent is 2.5-3 in the acid pickling process; the alkaline medicament component comprises sodium hydroxide, sodium dodecyl benzene sulfonate and sodium polyphosphate; the pickling agent comprises citric acid and ammonia water. The chemical cleaning method for the reverse osmosis membrane of the industrial wastewater improves the cleaning effect and efficiency of the reverse osmosis membrane element, reduces the cleaning frequency and the using amount of cleaning agents of the reverse osmosis membrane, prolongs the service cycle of the reverse osmosis membrane, and is beneficial to reducing the maintenance cost of a reverse osmosis membrane pressure container; can be applied to the treatment of industrial wastewater with complex water quality and high pollutant content and wastewater in other fields, and is beneficial to the social popularization and application.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment, in particular to a chemical cleaning method for a reverse osmosis membrane of industrial wastewater.
Background
The reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics and is made by simulating a biological semipermeable membrane, and is a core component of a reverse osmosis technology. The principle of reverse osmosis is that under the action of the osmotic pressure higher than that of the solution, other substances are separated from water based on the fact that the substances cannot permeate a semipermeable membrane. The reverse osmosis membrane has two types of structures, namely an asymmetric membrane and a homogeneous membrane. The currently used membrane materials are mainly cellulose acetate and aromatic polyamides. The components of the device are hollow fiber type, roll type, plate frame type and tube type. The reverse osmosis membrane is widely applied to the fields of electric power, petrochemical industry, steel, electronics, medicines, food and beverage, municipal administration, environmental protection and the like, and plays an important role in seawater and brackish water desalination, boiler feed water, industrial pure water and electronic grade ultrapure water preparation, drinking pure water production, wastewater treatment and special separation processes.
The reverse osmosis membrane pollution causes the performance reduction of the reverse osmosis membrane, and the working efficiency and the service life of a reverse osmosis system are influenced. Chemical cleaning is one of the means to restore the performance of reverse osmosis membranes. The correct cleaning method can not only prolong the service life of the membrane, but also ensure the quality of the reverse osmosis effluent. Improper cleaning methods not only can cause irreversible damage to the membrane, but also can affect the service life of the membrane. Currently, a method for cleaning a reverse osmosis membrane includes: acid washing, alkali washing, sterilization and the like.
Most of the existing reverse osmosis membrane chemical cleaning methods are directed to reverse osmosis membranes for treating surface water or seawater. For the industrial wastewater reverse osmosis membrane, which is mainly used for treating production wastewater, domestic wastewater and rainwater, the water quality is complex, the pollutant content is high, and the index is far away from the water quality index of surface water or seawater. Therefore, the reverse osmosis membrane chemical cleaning method in the prior art is not suitable for cleaning the reverse osmosis membrane of the industrial wastewater, and a chemical cleaning method suitable for the reverse osmosis membrane of the industrial wastewater is urgently needed to be found.
Disclosure of Invention
In view of the above defects of the prior art, the invention aims to improve the cleaning effect of reverse osmosis membrane elements, reduce the cleaning frequency of reverse osmosis membranes, ensure the quality and the yield of reverse osmosis effluent and reduce the labor intensity of workers.
In order to achieve the purpose, the invention provides a chemical cleaning method for a reverse osmosis membrane of industrial wastewater, which comprises two links of an alkali cleaning link and an acid cleaning link, wherein an alkaline medicament with the pH value of 11-11.5 is adopted in the alkali cleaning link; and the pH value of an acid pickling agent is 2.5-3 in the acid pickling link.
Further, the alkaline medicament component comprises sodium hydroxide, sodium dodecyl benzene sulfonate and sodium polyphosphate;
further, in the alkaline medicament component, the weight (g) percentage content of sodium hydroxide is 0.02-0.08%, the weight (g) percentage content of sodium dodecyl benzene sulfonate is 0.05-0.15%, and the weight (g) percentage content of sodium polyphosphate is 0.2-0.8%;
further, in the alkaline washing link, the alkaline washing mode is one-section washing and two-section sectional washing, wherein the two sections are washed first and then the first section is washed;
further, the pH value of the pickling agent is preferably 2.6-3;
further, the pickling agent component comprises citric acid and ammonia water;
further, in the components of the pickling agent, the weight (gram) percentage of citric acid is 1-3%;
furthermore, in the pickling link, the pickling mode is that one-stage washing is carried out once, and two-stage washing is carried out twice, wherein the first-stage washing and the second-stage washing are carried out simultaneously, and then the second-stage washing is carried out once;
further, the chemical cleaning method for the reverse osmosis membrane of the industrial wastewater comprises the following steps:
step 1, preparing an alkali washing agent and an acid washing agent;
step 2, performing secondary alkali washing on the reverse osmosis membrane;
step 3, performing primary alkali washing on the reverse osmosis membrane;
step 4, simultaneously pickling the first section and the second section of the reverse osmosis membrane;
step 5, reverse osmosis membrane two-stage acid washing;
further, the chemical cleaning method for the reverse osmosis membrane of the industrial wastewater comprises the following steps:
step 1, preparing an alkali washing medicament and an acid washing medicament, and respectively injecting the alkali washing medicament and the acid washing medicament into respective cleaning medicament boxes for standby;
2, enabling the alkali washing agent to enter a second section of the pressure container at a low flow rate, increasing the flow rate to a medium flow rate for circulation and monitoring the pH value of the alkali washing agent at the same time, stopping circulation for soaking for 2 hours after the pH value is kept stable between 11 and 11.5, then circulating for 3 hours at a high flow rate, and finishing second-section alkali washing after washing;
step 3, enabling the alkali washing agent to enter a pressure container at a low flow rate, increasing the flow rate to be a medium flow rate for circulation, monitoring the pH value of the alkali washing agent at the same time, stopping circulation for soaking for 10 hours after the pH value is kept stable between 11 and 11.5, increasing the flow rate to be a large flow rate for circulation for 4 hours, repeatedly soaking and repeatedly circulating at a large flow rate once, and washing to finish primary alkali washing;
step 4, enabling the pickling agent to flow into the first section of the pressure container at a low flow rate and flow out of the second section of the pressure container, circulating and monitoring the pH value of the pickling agent at the same time, circulating for 3 hours after the pH value is maintained to be stable between 2.5 and 3, then soaking for 3 hours, then increasing the flow rate to be high-flow circulating for 4 hours, and washing to finish the first-section pickling and the second-section pickling;
and 5, enabling the acid washing agent to enter the second section of the pressure container at a low flow rate, circulating and monitoring the pH value of the alkaline agent at the same time, circulating for 2 hours after the pH value is maintained to be stable between 2.5 and 3, stopping circulating and soaking for 4 hours, maintaining the flow rate unchanged, circulating for 4 hours, and washing to finish the second-section acid washing.
In a preferred embodiment of the present invention, the alkaline agent component comprises 0.05% by weight (g) of sodium hydroxide;
in another preferred embodiment of the present invention, in the alkaline pharmaceutical composition, the sodium dodecylbenzenesulfonate is contained in an amount of 0.1% by weight (g);
in another preferred embodiment of the present invention, the sodium polyphosphate in the alkaline pharmaceutical composition has a weight (g) percentage of 0.5%;
in another preferred embodiment of the present invention, the acid pickling agent component comprises citric acid in an amount of 2% by weight (g);
in another preferred embodiment of the present invention, in the step 2, the low flow rate is 60m3H; medium flow rate of 120m3H; the large flow is 150m3/h；
In another preferred embodiment of the present invention, in the step 3, the low flow rate is 100m3H; medium flow rate of 150m3H; the large flow is 240m3/h；
In another preferred embodiment of the present invention, in the step 3, the repeated soaking time is 3 hours; the repeated large flow time is 2 hours;
in another preferred embodiment of the present inventionIn the step 4, the low flow rate is 150m3H; the large flow is 210m3/h；
In another preferred embodiment of the present invention, in the step 5, the low flow rate is 150m3/h；
In another preferred embodiment of the present invention, in the steps 2, 3, 4 and 5, after the acid washing or alkali washing cycle is finished, the rinsing time is 20 minutes.
By adopting the scheme, the chemical cleaning method for the reverse osmosis membrane of the industrial wastewater disclosed by the invention has the following beneficial effects:
1. according to the chemical cleaning method for the industrial wastewater reverse osmosis membrane, the components and the content of cleaning agents are optimized by adjusting and controlling the pH values of acid-washing and alkali-washing agents used for cleaning, so that the cleaning effect of the reverse osmosis membrane element is improved, the cleaning frequency of the reverse osmosis membrane is reduced, the quality and the water yield of reverse osmosis effluent are improved, the labor intensity of workers is reduced, the service cycle of the reverse osmosis membrane is prolonged, and the maintenance cost of a reverse osmosis membrane pressure vessel is reduced;
2. according to the chemical cleaning method for the industrial wastewater reverse osmosis membrane, the cleaning step sequence is optimized through adjustment, the steps of firstly performing alkali cleaning and then performing acid cleaning are adopted, the alkali cleaning adopts first two-stage cleaning and then one-stage rinsing, the acid cleaning adopts first and second stages for simultaneous cleaning, and then the step of performing one-time chemical cleaning on the second stage is repeated, so that the use amount of cleaning agents is reduced, and the cleaning maintenance cost is saved;
3. according to the chemical cleaning method for the reverse osmosis membrane of the industrial wastewater, the reverse osmosis membrane is cleaned and soaked by adopting three different cleaning liquid flows of low, medium and high, and the cleaning quality and the cleaning efficiency are improved by adjusting the matching of the circulation time and the soaking time;
4. the chemical cleaning method of the reverse osmosis membrane can be applied to the treatment of industrial wastewater with complex water quality and high pollutant content and wastewater in other fields, and is beneficial to social popularization and application.
In conclusion, the chemical cleaning method for the reverse osmosis membrane of the industrial wastewater improves the cleaning effect and efficiency of the reverse osmosis membrane element, reduces the cleaning frequency and the using amount of cleaning agents of the reverse osmosis membrane, prolongs the service cycle of the reverse osmosis membrane, and is beneficial to reducing the maintenance cost of the reverse osmosis membrane pressure vessel; can be applied to the treatment of industrial wastewater with complex water quality and high pollutant content and wastewater in other fields, and is beneficial to the social popularization and application.
The conception, the specific technical solutions and the technical effects of the present invention will be further described with reference to specific embodiments so as to fully understand the objects, the features and the effects of the present invention.
Detailed Description
The technical content of the present invention will be more clearly understood and appreciated by referring to preferred embodiments thereof. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
Example 1:
the chemical cleaning method for the reverse osmosis membrane of the industrial wastewater comprises the following steps:
step 1, preparing an alkali washing medicament and an acid washing medicament, and specifically operating as follows:
(1) preparation of pickling agent
Cleaning an acid liquor cleaning medicine box with reverse osmosis water production, and emptying;
then 8m3Injecting reverse osmosis produced water into a cleaning medicine box, and heating the water to 35 ℃;
starting a circulating pump and opening a circulating door;
25kg of citric acid is poured into a cleaning medicine box after being dissolved, and after the addition is finished, the cleaning medicine box is replenished with water to 10m3Obtaining a citric acid solution with the weight percentage of 2 percent;
adding ammonia water to adjust the pH value to 2.5-3 for later use
(2) Preparation of alkali washing agent
Firstly, cleaning an alkali liquor cleaning medicine box by using reverse osmosis produced water, and emptying;
then 8m3Injecting reverse osmosis produced water into a cleaning medicine box, and heating the water to 35 ℃;
starting a circulating pump and opening a circulating door;
dissolving sodium dodecyl benzene sulfonate, and pouring into a cleaning medicine box;
adding sodium hydroxide to adjust the pH value to 11-11.5;
dissolving sodium polyphosphate, and pouring into a cleaning medicine box;
after the adding is finished, replenishing water to the cleaning medicine box to 10m3(ii) a The alkaline washing agent is obtained, wherein the percentage content of the sodium dodecyl benzene sulfonate is 0.1 percent, the percentage content of the sodium hydroxide is 0.05 percent, and the percentage content of the sodium polyphosphate is 0.5 percent.
Step 2, reverse osmosis membrane two-stage alkali washing, which comprises the following specific operations:
stopping the reverse osmosis system to be cleaned from the industrial personal computer, automatically cleaning for 15min, and emptying the rack;
closing the concentrated water discharge valve, opening a second-stage cleaning inlet valve, a second-stage cleaning return valve and a water production side return valve;
opening an inlet valve and an outlet valve of the chemical cleaning cartridge filter, and paying attention to exhaust of the cartridge filter;
slowly closing the reflux valve of the cleaning tank to ensure that the alkali cleaning solution is 60m3The low flow of/h is driven into the pressure container;
circulating for 30min, measuring pH of the solution in the cleaning tank, and adjusting the pH to above 11.5 with sodium hydroxide if the pH is lower than 11.5; if the cleaning solution is too turbid, the medicine should be dispensed again;
measuring the pH value every 10min, and adjusting until the pH value is stabilized above 11.5; the flow rate is increased to 120m3/h；
After the PH value is stable, soaking is started, a backflow valve at the concentrated water side is closed firstly during soaking, then an outlet valve of the cleaning pump is closed, the cleaning pump is stopped, and heating equipment of the cleaning tank is closed; closing the second-stage cleaning inlet valve and the water production side reflux valve, and soaking for 2 hours;
the flow rate is adjusted to 150m3The flow is circulated for 3 hours;
after the second-stage cleaning is finished, stopping the cleaning pump; the second-stage agent flows back to the chemical cleaning tank, and then the second-stage cleaning water inlet door and the second-stage cleaning water return door are closed;
the second washing period is 20 min.
Step 3, performing first-stage alkali washing on the reverse osmosis membrane, and specifically performing the following operations:
starting the chemical cleaning pump, and circulating the alkaline medicament in the dispensing tank;
opening a section of cleaning water inlet valve and a section of concentrated water side return valve, adjusting a circulating valve, and adjusting the flow to 100m3/h；
The flow is stabilized at 100m by adjusting the circulating valve3Circulating for 30min, measuring the pH value of the solution in the cleaning tank, and if the pH value is lower than 11.5, adding sodium hydroxide to adjust the pH value to be more than 11.5; if the cleaning solution is too turbid, the medicine should be dispensed again;
measuring the pH value every 10min, and adjusting until the pH value is stabilized above 11.5; after the pH value is stabilized, the flow rate is adjusted to 150m3Circulating for 3 hours for soaking;
when in soaking, the backflow valve at the concentrated water side is closed, then the outlet valve of the cleaning pump is closed, the cleaning pump is stopped, and the heating equipment of the cleaning tank is closed; closing a section of the reflux valve at the water inlet and production side for cleaning, and soaking for 10 hours overnight;
opening an outlet valve of the cartridge filter, opening a first section of cleaning water inlet valve, a first section of concentrated water side return valve and a water production pool return valve, and starting a chemical cleaning pump; the circulation valve is adjusted to slowly increase the outlet flow to 240m3H, performing high-flow circulation for 4 hours;
repeating the soaking operation for 3 hours;
repeating the high-flow circulation operation for 2 hours;
stopping the cleaning pump after the first-stage cleaning is finished; the first section of the agent flows back to the chemical cleaning tank, and then the first section of the cleaning water inlet door and the first section of the concentrated water side cleaning water return door are closed;
and (5) washing and reverse osmosis for 20 min.
Step 4, simultaneously pickling the first section and the second section of the reverse osmosis membrane, and specifically carrying out the following operations:
closing the concentrated water discharge valve, opening the first section cleaning inlet valve, the second section concentrated water side reflux valve and the water production side reflux valve;
opening an inlet valve and an outlet valve of the cartridge filter, and paying attention to exhaust of the cartridge filter;
slowly closing the reflux valve of the cleaning tank to ensure that the acid cleaning solution is 150m3A lower flow rate of/h is driven into the pressure container;
after circulating for 30min, taking the solution in the cleaning tank, measuring the pH value, and if the pH value is higher than 3, adding citric acid to adjust the pH value to 2.5-3;
measuring the pH value every 10min, and adjusting until the pH value is stabilized at 2.5-3; after the pH value is stable, circulating for 3 hours at a low flow rate, and soaking for 3 hours;
when soaking, the two-section concentrated water side reflux valve is closed, then the outlet valve of the cleaning pump is closed, and the cleaning pump is stopped; closing a section of cleaning water inlet and water production side reflux valve, soaking for 3h, and starting circulation;
opening an outlet valve of the cartridge filter, opening a first-stage cleaning water inlet valve, a second-stage concentrated water side reflux valve and a water production pool reflux valve, and starting a chemical cleaning pump; the circulation valve is adjusted to slowly increase the outlet flow to 210m3H, performing high-flow circulation for 4 hours;
after the first section and the second section are cleaned, the cleaning pump is stopped; the reagent flows back to the chemical cleaning tank, and then the second-stage cleaning water inlet door and the second-stage cleaning water return door are closed;
and (5) reverse osmosis washing for 20 min.
And 5, performing reverse osmosis membrane two-stage acid washing, which comprises the following specific operations:
closing the concentrated water discharge valve, opening a second-stage cleaning inlet valve, a second-stage cleaning return valve and a water production side return valve;
opening an inlet valve and an outlet valve of the cartridge filter, and paying attention to exhaust of the cartridge filter;
slowly closing the reflux valve of the cleaning tank to make the cleaning liquid reach 150m3The flow rate of/h is driven into the pressure container;
circulating for 30min, measuring the pH value of the solution in the cleaning tank, and if the pH value is higher than 3, adding citric acid to adjust the pH value to be below 3; after the pH value is stable, continuously circulating for 2 hours for soaking;
when in soaking, the backflow valve at the concentrated water side is closed, the cleaning pump is stopped, and the heating equipment of the cleaning tank is closed; closing the second-stage cleaning inlet valve and the water production side reflux valve, and beginning circulation after soaking for 4 hours;
during circulation, the concentrated water side is firstly opened for backflow, the cleaning pump is started, and the flow is kept at 150m3H, circulating for 4 hours;
after the second-stage cleaning is finished, stopping the cleaning pump; the second stage reagent flows back to the chemical cleaning tank, and then the second stage cleaning tank is closed.
And washing for a second period of 20 min.
And finishing the chemical cleaning of the whole reverse osmosis membrane.
Examples 2,
Replacing the percentage of citric acid in the acid-washing medicament in the step 1 by 1 percent instead of 2 percent in the example 1 by adopting the similar operation of the steps in the example 1; and (3) in the alkaline cleaning agent in the step (1), replacing 0.1 percent of sodium dodecyl benzene sulfonate in the example 1 by 0.05 percent, replacing 0.05 percent of sodium hydroxide in the example 1 by 0.02 percent, and replacing 0.5 percent of sodium polyphosphate in the example 1 by 0.2 percent, and chemically cleaning the reverse osmosis membrane of the industrial wastewater.
Examples 3,
Replacing the percentage of citric acid in the acid-washing medicament in the step 1 by 3 percent instead of 2 percent in the embodiment 1 by adopting the similar operation of the steps in the embodiment 1; and (3) in the alkaline cleaning agent in the step (1), replacing 0.1 percent of sodium dodecyl benzene sulfonate in the example 1 by 0.15 percent, replacing 0.05 percent of sodium hydroxide in the example 1 by 0.08 percent, and replacing 0.5 percent of sodium polyphosphate in the example 1 by 0.8 percent, and chemically cleaning the reverse osmosis membrane of the industrial wastewater.
Through detection, after the chemical cleaning method for the reverse osmosis membrane of the industrial wastewater is used for chemically cleaning the reverse osmosis membrane of the industrial wastewater in the embodiments 1-3, the quality and the water yield of reverse osmosis effluent are improved, the service life of the reverse osmosis membrane is prolonged, the labor intensity of workers is reduced, and the maintenance cost of the reverse osmosis membrane pressure vessel is reduced.
The other embodiments and technical solutions of the present invention have similar beneficial effects to the above embodiments.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (4)
1. A chemical cleaning method for reverse osmosis membrane of industrial waste water is characterized by comprising two links of alkali washing and acid washing, wherein,
the chemical cleaning method for the reverse osmosis membrane of the industrial wastewater comprises the following steps:
step 1, preparing an alkali washing medicament and an acid washing medicament, and respectively injecting the alkali washing medicament and the acid washing medicament into respective cleaning medicament boxes for standby;
2, enabling the alkali washing agent to enter a second section of the pressure container at a low flow rate, increasing the flow rate to a medium flow rate for circulation and monitoring the pH value of the alkali washing agent at the same time, stopping circulation for soaking for 2 hours after the pH value is kept stable between 11 and 11.5, then circulating for 3 hours at a high flow rate, and finishing second-section alkali washing after washing;
3, enabling the alkali washing agent to enter a pressure container at a low flow rate, increasing the flow rate to be a medium flow rate for circulation and monitoring the pH value of the alkali washing agent at the same time, stopping circulation for soaking for 10 hours after the pH value is kept stable between 11 and 11.5, then increasing the flow rate to be a large flow rate for circulation for 4 hours, repeatedly soaking and repeatedly circulating at a large flow rate once, and flushing to finish primary alkali washing;
step 4, enabling the pickling agent to flow into the first section of the pressure container at a low flow rate and flow out of the second section of the pressure container, circulating and monitoring the pH value of the pickling agent at the same time, circulating for 3 hours after the pH value is kept stable between 2.5 and 3, then soaking for 3 hours, then increasing the flow rate to be high-flow circulating for 4 hours, and flushing to finish first-section and second-section pickling;
step 5, enabling the low flow of the pickling agent to enter a second section of the pressure container, circulating and monitoring the pH value of the pickling agent at the same time, circulating for 2 hours after the pH value is maintained to be stable between 2.5 and 3, stopping circulating and soaking for 4 hours, maintaining the flow unchanged, circulating for 4 hours, and flushing to finish second-section pickling;
in the alkaline washing agent component, the weight percentage content of sodium hydroxide is 0.05 percent, the weight percentage content of sodium dodecyl benzene sulfonate is 0.1 percent, and the weight percentage content of sodium polyphosphate is 0.5 percent.
2. The method according to claim 1, wherein the acid pickling agent has a pH of 2.6 to 3; the pickling agent comprises citric acid and ammonia water.
3. The method of claim 2, wherein the acid wash reagent comprises citric acid in an amount of 1% to 3% by weight.
4. The method of claim 3, wherein the acid wash composition comprises about 2% citric acid by weight.
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