CN112892856A - Cold rolling waste treatment method - Google Patents
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- CN112892856A CN112892856A CN202110049417.7A CN202110049417A CN112892856A CN 112892856 A CN112892856 A CN 112892856A CN 202110049417 A CN202110049417 A CN 202110049417A CN 112892856 A CN112892856 A CN 112892856A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
- C23G5/02—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a cold rolling waste treatment method, which comprises the following steps: step 1: collecting cold rolling waste in the cold rolling process, fully and uniformly mixing the cold rolling waste with industrial desalted water, standing for 12-24 hours after uniform mixing for full mixing and separation and precipitation, fully dispersing rolling oil in the cold rolling waste in the industrial desalted water, and sucking out precipitates rich in iron powder by using a magnet; step 2: adding the precipitate obtained in the step 1 into a cleaning agent, uniformly mixing, standing for 12-24h for secondary precipitation, sucking out the precipitate by using a magnet again, drying the sucked precipitate, and treating and recycling the cleaning agent containing the rolling oil or sending the cleaning agent containing the rolling oil into a waste water treatment station of a cold rolling unit for treatment; and step 3: and (3) recycling the precipitate obtained in the step (2) as a sintering raw material or a raw material for a solid incinerator. The method can separate the rolling oil and the iron powder in the cold rolling waste, and recycle the iron powder, and the cost of the whole treatment process is low.
Description
Technical Field
The invention belongs to the field of cold rolling units, and particularly relates to a cold rolling waste treatment method.
Background
The cold rolling mill is a common production device of metallurgical enterprises, the production process of cold rolling is to send strip steel into a roller which rotates continuously, the strip steel is gradually thinned through the up and down huge pressure of the roller, and in the processing process, huge friction force can be formed between the strip steel and the roller, the friction force provides basic conditions required by the cold rolling production of the strip steel on one hand, but the excessive friction force also causes friction and abrasion, and the influence limits the production cost and the efficiency of the cold rolling production. The highest production speed of modern cold rolling mills is very fast (more than or equal to 1000m/min), so in order to reduce friction loss and heat generation during production, a small amount of rolling oil and a large amount of water are generally adopted to prepare emulsion for production. The emulsions are generally recycled, so that inevitably, a lot of friction iron powder from the steel strips and the rollers is gradually accumulated in the emulsions, so that the iron powder is adsorbed by a magnetic filter, a large amount of rolling oil is also adsorbed in the process, 10-40 tons of waste is usually generated per month in each cold rolling mill group, the magnetic filtration oil sludge as the cold rolling waste can only be processed by professional processing companies, secondary pollution is easy, and a large amount of rolling oil is lost. The typical cold rolling waste appearance is shown in figure 1.
The content of the cold-rolled magnetic filtration oil sludge cold-rolled waste is about 30-50% by mass percent and the content of the rolling oil is about 50-70% by mass percent, and because the iron powder and the oil are mixed at the same time, the cold-rolled magnetic filtration oil sludge cold-rolled waste is generally regarded as solid dangerous waste with high oil content, cannot be used as fuel oil or solid waste iron for reutilization, and is always a pollution treatment difficulty of metallurgical enterprises.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a method for performing harmless treatment by separating rolling oil and iron powder from cold rolling waste.
In order to achieve the purpose, the technical scheme of the invention is as follows: a cold rolling waste treatment method comprises the following steps:
step 1: collecting cold rolling waste in the cold rolling process, and fully and uniformly mixing the cold rolling waste with industrial desalted water, wherein the mass ratio of the cold rolling waste to the industrial desalted water is 1: 1-5, after uniformly mixing, placing for 12-24h for fully mixing, separating and precipitating, fully dispersing rolling oil in cold rolling waste in industrial desalted water, sucking out precipitates rich in iron powder by using a magnet, and returning the industrial desalted water containing the rolling oil to a cold rolling waste water treatment station for treatment and utilization;
step 2: adding the precipitate obtained in the step 1 into a cleaning agent, fully and uniformly mixing, standing for 12-24h for secondary precipitation after uniform mixing, sucking out the precipitate by using a magnet again, drying the sucked precipitate, and treating and recycling the cleaning agent containing the rolling oil or sending the cleaning agent containing the rolling oil into a waste water treatment station of a cold rolling unit for treatment;
and step 3: and (3) recycling the precipitate obtained in the step (2) as a sintering raw material or a raw material for a solid incinerator.
Wherein: in the step 1, the industrial desalted water added with the cold rolling waste is heated to 30-50 ℃ in the process of uniformly mixing.
Wherein, the cleaning agent added with the precipitate is heated to 55-85 ℃ in the process of uniformly mixing in the step 2.
Wherein, the blending process in the step 1 is to blow air into the industrial desalted water with the cold rolling waste and/or to carry out mechanical stirring.
Wherein the cleaning agent in the step 2 is 10-40 wt% of sodium hydroxide solution, and the mass ratio of the cleaning agent to the precipitate obtained in the step 1 is 0.2-1: 1.
and (3) sending the cleaning agent containing the rolling oil in the step (2) to a waste water treatment station of a cold rolling unit for treatment.
The cleaning machine in the step 2 is an organic cleaning agent, and the mass ratio of the dosage of the cleaning agent to the precipitate obtained in the step 2 is (2-4): 1.
wherein, the organic solvent in the organic cleaning agent is one or a mixture of more of ethanol, methyl ethyl ketone, heptane and octane.
And (3) feeding the cleaning agent containing the rolling oil in the step (2) into a rectifying device for rectifying treatment, so as to recover the rolling oil substance, wherein the rectifying temperature is 80-140 ℃, and the rectifying reflux ratio is controlled between 0.8-1.6.
Compared with the prior art, the invention has the beneficial effects that: the method can separate the rolling oil and the iron powder in the cold rolling waste, recycle the iron powder, recycle most of the cold rolling oil in the cold rolling waste, and perform harmless treatment or further simple recycle on the rest of the rolling oil, and the cost of the whole treatment process is low.
Drawings
Fig. 1 is a typical physical diagram of a conventional cold rolling waste.
Detailed Description
The principles and features of this invention are described below in conjunction with embodiments, which are included to explain the invention and not to limit the scope of the invention.
The invention provides a cold rolling waste treatment method, which comprises the following steps:
step 1: collecting cold rolling waste in the cold rolling process, and fully and uniformly mixing the cold rolling waste with industrial desalted water, wherein the mass ratio of the cold rolling waste to the industrial desalted water is 1: 1-5, uniformly mixing, standing for 12-24h for mixing, separating and precipitating, fully dispersing rolling oil in the cold rolling waste in industrial desalted water, sucking out precipitates rich in iron powder by using a magnet, and returning the industrial desalted water containing the rolling oil to the existing cold rolling waste water treatment station for treatment and utilization;
step 2: adding the precipitate obtained in the step (1) into a cleaning agent, fully and uniformly mixing to dissolve rolling oil on the surface of the precipitate into the cleaning agent, standing for 12-24 hours after uniformly mixing for secondary precipitation, sucking out the precipitate by using a magnet again, drying the sucked-out precipitate, and treating and recycling the cleaning agent containing the rolling oil or sending the cleaning agent containing the rolling oil into a wastewater treatment station of a cold rolling unit for treatment;
and step 3: and (3) recycling the precipitate obtained in the step (2) as a sintering raw material or a raw material for a solid incinerator.
Wherein: in the step 1, the industrial desalted water added with the cold rolling waste is heated to 30-50 ℃ in the process of uniformly mixing.
Wherein, the cleaning agent added with the precipitate is heated to 55-85 ℃ in the process of uniformly mixing in the step 2.
Wherein, in the blending process in the step 1, preferably, a fan is used for blowing air into the industrial desalted water with the cold rolling waste and/or mechanically stirring.
Wherein the cleaning agent in the step 2 is 10-40 wt% of sodium hydroxide solution, and the mass ratio of the cleaning agent to the precipitate obtained in the step 1 is 0.2-1: 1.
and (3) sending the cleaning agent containing the rolling oil in the step (2) to a waste water treatment station of a cold rolling unit for treatment.
The cleaning machine in the step 2 is an organic cleaning agent, and the mass ratio of the dosage of the cleaning agent to the precipitate obtained in the step 2 is (2-4): 1.
wherein, the organic solvent in the organic cleaning agent is one or a mixture of more of ethanol, methyl ethyl ketone, heptane and octane.
And (3) feeding the cleaning agent containing the rolling oil in the step (2) into a rectifying device for rectifying treatment, so as to recover the rolling oil substance, wherein the rectifying temperature is 80-140 ℃, and the rectifying reflux ratio is controlled between 0.8-1.6.
Example 1
Step 1: firstly, adding cold rolling waste (namely cold rolling magnetic filtration oil sludge, wherein the mass ratio of iron powder to rolling oil is 3: 7) into industrial desalted water to prepare a mixture, wherein the mass of the industrial desalted water is 3 times that of the cold rolling waste, then heating the mixture to 50 ℃, continuously blowing by adopting an air bubbling method or continuously stirring the mixture by adopting a stirring device, uniformly mixing, placing for 24 hours to precipitate the iron powder, then using a permanent magnet rod for adsorption separation, separating out precipitate (the iron powder with the rolling oil attached to the surface), reducing the oil content of the separated precipitate to 32-35%, and sending the rest mixture to a cold rolling waste water treatment station for further water treatment and utilization;
step 2: adding a cleaning agent (a sodium hydroxide solution with the concentration of 40 wt%) into the precipitate obtained in the step 1, wherein the mass of the cleaning agent is 1 time of that of the precipitate, heating the cleaning agent added with the precipitate to 85 ℃, fully mixing uniformly, standing for 24 hours to precipitate iron powder, decomposing most of rolling oil remained on the surface of the iron powder and flowing into the cleaning agent, continuously adsorbing the iron powder by using a permanent magnet rod to separate the iron powder from the cleaning agent, sending the rest cleaning agent containing the oil component into a waste water treatment station of a cold rolling mill train for treatment, and drying the obtained iron powder by using hot air with the temperature of 95 ℃ to obtain the iron powder with the oil content of 3.5%.
Example 2
Step 1: firstly, adding cold rolling waste (namely cold rolling magnetic filtration oil sludge, wherein the mass ratio of iron powder to rolling oil is 3.5: 6.5) into industrial desalted water to prepare a mixture, wherein the mass of the industrial desalted water is 2 times of that of the cold rolling waste, then heating the mixture to 35 ℃, continuously blowing by adopting an air bubbling method or continuously stirring the mixture by adopting a stirring device, uniformly mixing, placing for 12 hours to precipitate iron powder, then using a permanent magnet rod for adsorption separation, separating out precipitate (the iron powder with the rolling oil attached to the surface), reducing the oil content of the separated precipitate to 26-28%, and sending the rest mixture to a cold rolling waste water treatment station for further water treatment and utilization;
step 2: adding a cleaning agent (a sodium hydroxide solution with the concentration of 20 wt%) into the precipitate obtained in the step 1, wherein the mass of the cleaning agent is 0.5 times that of the precipitate, heating the cleaning agent added with the precipitate to 75 ℃, fully mixing uniformly, standing for 12 hours to precipitate iron powder, decomposing most of rolling oil remained on the surface of the iron powder and flowing into the cleaning agent, continuing adsorbing the iron powder by using a permanent magnet rod to separate the iron powder from the cleaning agent, sending the rest cleaning agent containing the oil component into a waste water treatment station of a cold rolling mill train for treatment, drying the obtained iron powder by using hot air with the temperature of 95 ℃, and finally obtaining the iron powder with the oil content of 5.5%.
Example 3
Step 1: firstly, adding cold rolling waste (namely cold rolling magnetic filtration oil sludge, wherein the mass ratio of iron powder to rolling oil is 4: 6) into industrial desalted water to prepare a mixture, wherein the mass of the industrial desalted water is 2.5 times of that of the cold rolling waste, then heating the mixture to 50 ℃, continuously blowing the mixture by adopting an air bubbling method or continuously stirring the mixture by adopting a stirring device, uniformly mixing, standing for 20 hours to precipitate iron powder, then using a permanent magnet rod to adsorb and separate, separating out precipitate (the iron powder with the rolling oil attached to the surface), reducing the oil content of the separated precipitate to 24-26%, and sending the rest mixture to a cold rolling waste water treatment station for further water treatment and utilization;
step 2: adding a cleaning agent (sodium hydroxide solution with the concentration of 18 wt%) into the precipitate obtained in the step 1, wherein the mass of the cleaning agent is 0.8 times of that of the precipitate, heating the cleaning agent added with the precipitate to 80 ℃, fully mixing uniformly, standing for 14 hours to precipitate iron powder, decomposing most of rolling oil remained on the surface of the iron powder and flowing into the cleaning agent, continuing adsorbing the iron powder by using a permanent magnet rod to separate the iron powder from the cleaning agent, sending the rest cleaning agent containing the oil component into a waste water treatment station of a cold rolling mill train for treatment, drying the obtained iron powder by using hot air with the temperature of 85 ℃, and finally obtaining the iron powder with the oil content of 3%.
Example 4
Step 1: firstly, adding cold rolling waste (namely cold rolling magnetic filtration oil sludge, wherein the mass ratio of iron powder to rolling oil is 1: 1) into industrial desalted water to prepare a mixture, wherein the mass of the industrial desalted water is 2 times that of the cold rolling waste, then heating the mixture to 45 ℃, continuously blowing the mixture by adopting an air bubbling method or continuously stirring the mixture by adopting a stirring device, uniformly mixing, standing for 12 hours for precipitating iron powder, then using a permanent magnet rod for adsorption separation, separating out precipitate (the iron powder with the rolling oil attached to the surface), reducing the oil content of the separated precipitate to 20-22%, and sending the rest mixture to a cold rolling waste water treatment station for further water treatment and utilization;
step 2: adding a cleaning agent (a sodium hydroxide solution with the concentration of 10 wt%) into the precipitate obtained in the step 1, wherein the mass of the cleaning agent is 0.2 times that of the precipitate, heating the cleaning agent added with the precipitate to 80 ℃, fully mixing uniformly, standing for 18 hours to precipitate iron powder, decomposing most of rolling oil remained on the surface of the iron powder and flowing into the cleaning agent, continuing adsorbing the iron powder by using a permanent magnet rod to separate the iron powder from the cleaning agent, sending the rest cleaning agent containing the oil component into a waste water treatment station of a cold rolling mill train for treatment, drying the obtained iron powder by using hot air with the temperature of 85 ℃, and finally obtaining the iron powder with the oil content of 6%.
Example 5
The difference from example 1 is that in step 2, a cleaning agent (organic solvent octane) is added to the precipitate obtained in step 1, wherein the mass of the cleaning agent is 4 times of that of the precipitate, the cleaning agent with the precipitate is heated to 65 ℃, the cleaning agent is fully mixed and placed for 24 hours to precipitate iron powder, most of the rolling oil remaining on the surface of the iron powder is dissolved in the cleaning agent, the permanent magnet rod is used for adsorbing the iron powder to separate the iron powder from the cleaning agent, the obtained iron powder is dried by hot air at 95 ℃, the iron powder with the oil content of 4.8% is finally obtained, the rest cleaning agent containing the oil content is sent to a rectifying device for rectification, the temperature is controlled to be 135 ℃ by the rectifying device, the reflux ratio of the rectifying device is controlled to be 1.6, and the component obtained after the operation is a recyclable rolling oil substance.
Example 6
The difference from example 2 is that in step 2, a cleaning agent (organic solvent heptane) is added to the precipitate obtained in step 1, wherein the mass of the cleaning agent is 3 times of that of the precipitate, the cleaning agent with the precipitate is heated to 55 ℃, the cleaning agent is fully and uniformly mixed and placed for 18 hours to precipitate iron powder, most of the rolling oil remaining on the surface of the iron powder is dissolved in the cleaning agent, the permanent magnet rod is continuously used for adsorbing the iron powder to separate the iron powder from the cleaning agent, the obtained iron powder is dried by hot air at 95 ℃, the iron powder with the oil content of 3% is finally obtained, the rest cleaning agent containing the oil content is sent to a rectifying device for rectification, the temperature is controlled to be 115 ℃ by adopting the rectifying device, the reflux ratio of the rectifying device is controlled to be 1.1, and the component obtained after the operation is a recyclable rolling oil substance.
Example 7
The difference from example 3 is that, in step 2, a cleaning agent (organic solvent methyl ethyl ketone) is added to the precipitate obtained in step 1, wherein the mass of the cleaning agent is 3.6 times of that of the precipitate, the cleaning agent with the precipitate is heated to 60 ℃, the cleaning agent is fully mixed and placed for 16 hours to precipitate iron powder, most of the rolling oil remaining on the surface of the iron powder is dissolved in the cleaning agent, the permanent magnet rod is used to adsorb the iron powder to separate the iron powder from the cleaning agent, the obtained iron powder is dried by hot air at 85 ℃, the iron powder with the oil content of 5% is finally obtained, the rest cleaning agent with the oil content is sent to a rectifying device to be rectified, the temperature is maintained at 100 ℃ by the rectifying device, the reflux ratio of the rectifying device is controlled at 1.3, and the component obtained after the operation is a recovered rolling oil substance.
Example 8
The difference from example 4 is that, in step 2, a cleaning agent (ethanol) is added to the precipitate obtained in step 1, wherein the mass of the cleaning agent is 2 times of that of the precipitate, the cleaning agent with the precipitate is heated to 60 ℃, the cleaning agent is fully and uniformly mixed and placed for 24 hours to precipitate iron powder, most of the rolling oil remaining on the surface of the iron powder is dissolved in the cleaning agent, then the permanent magnet rod is continuously used for adsorbing the iron powder to separate the iron powder from the cleaning agent, the obtained iron powder is dried by using hot air at 85 ℃, finally the iron powder with oil content of 6.5% is obtained, the rest cleaning agent containing the oil content is sent to a rectifying device for rectification, the temperature is controlled to be 80 ℃ by using the rectifying device, the reflux ratio of the rectifying device is controlled to be 0.8, and the obtained component is a recovered rolling oil substance after the operation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A cold rolling waste treatment method is characterized by comprising the following steps:
step 1: collecting cold rolling waste in the cold rolling process, and fully and uniformly mixing the cold rolling waste with industrial desalted water, wherein the mass ratio of the cold rolling waste to the industrial desalted water is 1: 1-5, after uniformly mixing, placing for 12-24h for fully mixing, separating and precipitating, fully dispersing rolling oil in cold rolling waste in industrial desalted water, sucking out precipitates rich in iron powder by using a magnet, and returning the industrial desalted water containing the rolling oil to a cold rolling waste water treatment station for treatment and utilization;
step 2: adding the precipitate obtained in the step 1 into a cleaning agent, fully and uniformly mixing, standing for 12-24h for secondary precipitation after uniform mixing, sucking out the precipitate by using a magnet again, drying the sucked precipitate, and treating and recycling the cleaning agent containing the rolling oil or sending the cleaning agent containing the rolling oil into a waste water treatment station of a cold rolling unit for treatment;
and step 3: and (3) recycling the precipitate obtained in the step (2) as a sintering raw material or a raw material for a solid incinerator.
2. The cold rolling waste treatment method according to claim 1, wherein the industrial desalted water to which the cold rolling waste is added is heated to 30 to 50 ℃ in the mixing process in the step 1.
3. The cold rolling waste treatment method of claim 1, wherein the cleaning agent with the precipitate is heated to 55-85 ℃ in the mixing process in the step 2.
4. The cold rolling waste treatment method according to claim 1, wherein the kneading in step 1 is performed by blowing air into industrial desalted water to which the cold rolling waste is added and/or by performing mechanical stirring.
5. The cold rolling waste treatment method of claim 1, wherein the cleaning agent in the step 2 is 10-40 wt% sodium hydroxide solution, and the mass ratio of the amount of the cleaning agent to the precipitate obtained in the step 1 is 0.2-1: 1.
6. the cold rolling waste treatment method according to claim 5, wherein the cleaning agent containing the rolling oil in the step 2 is sent to a waste water treatment station of the cold rolling mill train for treatment.
7. The cold rolling waste treatment method of claim 1, wherein the cleaning machine in the step 2 is an organic cleaning agent, and the ratio of the dosage of the cleaning agent to the mass of the precipitate obtained in the step 2 is 2-4: 1.
8. the cold rolling waste treatment method of claim 7, wherein the organic solvent in the organic cleaning agent is one or a mixture of ethanol, methyl ethyl ketone, heptane and octane.
9. The cold rolling waste treatment method of claim 8, wherein the cleaning agent containing the rolling oil in the step 2 is sent to a rectification device for rectification treatment, so as to recover the rolling oil material, wherein the rectification temperature is 80-140 ℃, and the rectification reflux ratio is controlled between 0.8-1.6.
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| CN112844822A (en) * | 2020-12-31 | 2021-05-28 | 青岛浦森环保科技有限公司 | Magnetic filter for cold rolling oil treatment |
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2021
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| CN1559715A (en) * | 2004-02-20 | 2005-01-05 | 河北科技大学 | Recovery method of nanometer iron powder from cold rolling emulsion liquid |
| CN102303912A (en) * | 2011-08-02 | 2012-01-04 | 首钢总公司 | Post-treatment and purification process of iron oxide red for high-property soft magnetic ferrite |
| WO2014153570A2 (en) * | 2013-03-15 | 2014-09-25 | Transtar Group, Ltd | New and improved system for processing various chemicals and materials |
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