CN117660972A - Clean production method for roller box of straightener - Google Patents
Clean production method for roller box of straightener Download PDFInfo
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- CN117660972A CN117660972A CN202311624781.7A CN202311624781A CN117660972A CN 117660972 A CN117660972 A CN 117660972A CN 202311624781 A CN202311624781 A CN 202311624781A CN 117660972 A CN117660972 A CN 117660972A
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- roller box
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- 238000005554 pickling Methods 0.000 claims abstract description 63
- 239000002253 acid Substances 0.000 claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 40
- 238000002161 passivation Methods 0.000 claims abstract description 37
- 238000004140 cleaning Methods 0.000 claims abstract description 31
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 30
- 238000005406 washing Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000003513 alkali Substances 0.000 claims abstract description 22
- 239000002351 wastewater Substances 0.000 claims abstract description 15
- 239000008399 tap water Substances 0.000 claims abstract description 11
- 235000020679 tap water Nutrition 0.000 claims abstract description 11
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- 238000006386 neutralization reaction Methods 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims abstract description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 12
- 239000004094 surface-active agent Substances 0.000 claims description 10
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 8
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 6
- 235000019253 formic acid Nutrition 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 230000001680 brushing effect Effects 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- 230000003472 neutralizing effect Effects 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical group CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims description 2
- 238000005238 degreasing Methods 0.000 claims description 2
- 238000007865 diluting Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 10
- 239000010959 steel Substances 0.000 abstract description 10
- 239000000243 solution Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 9
- 239000000126 substance Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000003556 assay Methods 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- VSGNNIFQASZAOI-UHFFFAOYSA-L calcium acetate Chemical group [Ca+2].CC([O-])=O.CC([O-])=O VSGNNIFQASZAOI-UHFFFAOYSA-L 0.000 description 1
- 239000001639 calcium acetate Substances 0.000 description 1
- 235000011092 calcium acetate Nutrition 0.000 description 1
- 229960005147 calcium acetate Drugs 0.000 description 1
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- 238000011065 in-situ storage Methods 0.000 description 1
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- 239000004571 lime Substances 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
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- 230000001681 protective effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- 230000009897 systematic effect Effects 0.000 description 1
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Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a method for cleanly producing a roller box of a straight machine, which comprises the following steps: the method comprises the steps of (1) cleaning scale, and (1) flushing a roller box by using a high-pressure cleaner; (2) pouring the acid solution into a cleaning device and then into a roller box; (3) The roller box filled with the acid liquor is statically soaked for 2 hours, then is dynamically circulated for 3-4 hours, and is alternately cleaned in the front and back at intervals of 0.5 hour to finish acid washing; (4) Alkali washing is carried out on the roller box by alkali liquor in a dynamic circulation mode; (5) After the alkali washing is finished, repeatedly flushing the roller box with clean softened water by 0.5 to h; passivating, namely (I) removing oil from the roller box after removing the scale; (II) placing the roller box into a groove for pickling and passivating treatment; (III) washing with tap water; (IV) collecting and intensively treating the wastewater generated in the passivation process, adding alkaline lime water or sodium hydroxide into the wastewater for neutralization and discharging; the method ensures that the surface of the steel structure of the roller box of the straightener cannot be rusted, thereby not affecting the quality of the plate surface and the precision of equipment.
Description
Technical Field
The invention relates to a clean production method, in particular to a method for cleanly producing a roller box of a straightener, and belongs to the technical field of straighteners.
Background
In the running process of the plate steel rolling main line straightener equipment, the roller box, the working roller and the supporting roller in the roller box need cooling of inner and outer cooling water, so that the roller system is ensured to be used in a temperature control range, and no indentation is generated or equipment damage caused by high temperature is avoided. However, the use of cooling water can lead to rust of the roller steel structure, and the equipment matching precision is reduced; and rust can also fall onto the steel plate in the straightening process, so that the steel plate is in unscheduled and the quality and the equipment precision of the steel plate are affected due to the fact that the steel plate is in corrosion press-in.
Therefore, developing a method for clean production of a straightener roller box, which can overcome the defects, is a technical problem to be solved by the person skilled in the art.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a method for cleanly producing the roller box of the straightener, which ensures that the surface of the steel structure of the roller box of the straightener cannot be rusted, thereby not affecting the quality of the plate surface and the precision of equipment.
The technical scheme for solving the technical problems is as follows:
the method for cleanly producing the roller box of the straightener comprises the following steps:
(one) cleaning scale
(1) Flushing the roller box by a high-pressure cleaner for open cleaning;
(2) Pouring acid liquor into a pickling tank, and then slowly placing the roller box into the pickling tank;
the acid solution comprises the following components in percentage by mass: formic acid: 79-82%, buffer: 1.1-1.3%, surfactant: 0.7-0.9%, the balance being water, the sum of the components being 100%;
(3) The temperature is controlled at 60 ℃ during pickling, the roller box filled with acid liquor is statically soaked for 2 hours, then the dynamic circulation is carried out for 3-4 hours, and the positive and negative alternate cleaning is carried out every 0.5 hour during the dynamic circulation, so that the pickling is completed;
(4) After the pickling is finished, preparing alkali liquor, and alkali washing the roller box by using the alkali liquor in a dynamic circulation mode;
the alkali solution is NaOH, N a 3 P0 4 And softened water, by mass: naOH:60-70%; n a 3 P0 4 :20-24%, softened water 6-8%, itThe balance of water, wherein the sum of the components is 100 percent;
(5) After the alkali washing is finished, repeatedly washing the roller box with clean softened water for 0.5 to h, and thoroughly washing residues in the roller box;
(II) passivation
(I) Removing oil from the roller box after removing the scale;
(II) putting the roller box into another passivation pool again, carrying out pickling passivation treatment in the pool, and controlling the temperature to be 5-30 ℃;
(III) washing with tap water until the tap water is clean;
(IV) collecting and intensively treating the wastewater generated in the passivation process, adding alkaline lime water or sodium hydroxide into the wastewater for neutralization, and discharging the wastewater when the PH value is 6-9.
The technical scheme of the invention is further defined as follows:
in the method for cleanly producing the roller box of the straightener, the roller box is cleaned in sequence from top to bottom during flushing in the step (1).
The technical effect is that the cleaning operation is finished step by step in a organized and systematic way in the operation from top to bottom smoothly, the efficiency is improved, the job site is informed of the leadership and command of the safety manager, and the cleaning operation is finished more efficiently and to a high degree.
In the method for cleanly producing the roller box of the straightener, the acid liquor in the step (2) comprises the following components in percentage by mass: formic acid: 81%, buffer: 1.2%, surfactant: 0.8%, water: 17%, the sum of the components is 100%.
The invention has the technical effects that the proportion and components of the acid liquor are strictly controlled, the buffer and the surfactant are added into the formic acid, the cleaning effect is facilitated, the corrosion of the acid liquor to the roller box can be reduced, the buffer mainly maintains the PH value of the solvent in a relatively stable range, the fluctuation is not influenced by external environmental factors (temperature and humidity), and the hydrolysis rate reaches 100 percent under the condition that the PH=2 of the surfactant, so that the rapid cleaning effect is achieved.
In the method for cleanly producing the roller box of the straightener, the surfactant is sodium sulfate; the buffer is acetate.
In the method for cleanly producing the roller box of the straightener, after the pickling in the step (3), when the pH value of the acid liquor is more than 2, the acid liquor is collected for repeated use, and when the pH value of the acid liquor is not more than 2, the acid liquor is diluted, neutralized and then discharged.
The acid washing device has the advantages that the acid washing after acid washing is effectively recycled, if the pH value is small, neutralization can be timely carried out, then the acid washing is discharged, pollution is reduced, and the acid washing device is environment-friendly.
In the method for cleanly producing the roller box of the straightener, the step (I) of degreasing is specifically to adopt a polishing machine to install a polishing sheet to clean the roller box of the straightener so as to clean the surface of the roller box of the straightener with residual rust impurities.
In the method for cleanly producing the roller box of the straightener, the specific pickling passivation treatment of the roller box in the step (II) is as follows: firstly, placing the roller box in a pool for soaking for 24-48 hours, and then pulling out the roller box and placing the roller box on a step in the pool to carry out pickling passivation for 5-15 minutes by adopting a brush brushing or spraying mode.
The passivation method has the advantages that the corresponding passivation mode can be selected according to the situation to perform better passivation, the applicability is strong, and various requirements can be met.
In the method for cleanly producing the roller box of the straightener, the step (2) is to carry out positive and negative alternate cleaning during pickling, and the method specifically comprises the following steps: the acid liquor is stirred by a clockwise and anticlockwise stirring rod to form flowing liquor.
The acid pickling device has the advantages that the acid pickling effect can be quickened by positive and negative alternation, and the efficiency is improved.
The beneficial effects of the invention are as follows:
the basic principle of the invention is that the scale is removed:
(1) Dissolution, in which the acid solution reacts with the scale of calcium, magnesium and carbonate easily to generate soluble compounds, so that the scale is dissolved.
(2) The stripping action is that the acid liquor can dissolve the oxide on the metal surface and destroy the combination with the scale, thereby stripping the scale attached on the metal oxide surface and falling off.
(3) The gas lift action is that acid liquor reacts with calcium, magnesium and carbonate scale to generate a large amount of carbon dioxide. In the overflow process, the carbon dioxide gas has a certain lifting force for the indissolvable or slowly dissolved scale layer, so that the scale is separated from the heated surface of the heater.
(4) Loosening is that for scale containing silicate and sulfate, as oxides of calcium, magnesium, carbonate and iron are dissolved in acid solution, the residual scale becomes loose and is easily flushed by flowing acid solution.
According to the invention, the step (1) is used for physical cleaning, and the open type flushing is selected, so that the pickling effect can be improved, and the acid consumption of pickling can be reduced.
When the pickling temperature in the step (3) is strictly controlled to be 60 ℃, the pickling temperature is increased, the descaling effect is improved, if the temperature is too high, the corrosion of the acid liquor to the roller box is aggravated, and when the pickling temperature is controlled to be 60 ℃, the descaling efficiency is improved and the roller box is not corroded.
In the step (4), the roll box is subjected to alkali washing by using softened water to achieve acid-alkali neutralization, so that the roll box is not corroded any more.
The pickling passivation solution integrates pickling and passivation, so that the labor productivity is greatly improved; the pickling method is carried out by combining static soaking and dynamic circulation, the pickling time is firstly 2 hours, then the dynamic circulation is 3-4h, so that the pickling effect is better, scale can be removed statically, the scale can be removed dynamically, the scale can be cleaned in a deeper layer, the pickling effect is improved, the assay pickling concentration is frequently sampled in the pickling process, and the pickling reaction can be considered to be finished when the difference value between the adjacent two assay concentrations is lower than 0.2%.
The pickling passivation solution does not contain harmful substances, can be directly discharged after the neutralization treatment of the wastewater, has no influence on the environment, improves the efficiency of the concentrated treatment of the wastewater at the end of the step (IV), avoids the pollution to the environment, neutralizes the wastewater, discharges the wastewater after the pH value reaches the standard, has no pollution to the environment, and is environment-friendly.
The roller box treated by the method disclosed by the invention has the advantages that the corrosion resistance and rust prevention effects of the roller box are influenced by a plurality of factors such as workpiece materials, surface states, weather, air pollution conditions, dilution water quality, a construction method, a workpiece stacking mode and the like.
The invention can be applied to rust cleaning and subsequent anti-corrosion passivation treatment of the surfaces of the upper roller box and the lower roller box of the straightener, ensures that the roller box is free from corrosion in a service period, mainly solves the problem of repairing equipment parts due to water or water vapor corrosion, and effectively solves the problems of equipment precision stability and steel plate surface quality.
Detailed Description
Example 1
The method for cleanly producing the roller box of the straightener comprises the following steps:
(one) cleaning scale
(1) Flushing the roller box by using a high-pressure cleaner to carry out open cleaning, and cleaning the roller box sequentially from top to bottom during flushing;
(2) Pouring acid liquor into a special pickling tank, wherein the area of the pickling tank is larger than 4mx6m, the bottom surface and the side wall are subjected to acid-proof treatment, and then slowly placing the roller box into the pickling tank;
the acid solution comprises the following components in percentage by mass: formic acid: 81%, buffer: 1.2%, surfactant: 0.8%, water: 17%, the sum of the components is 100%;
the surfactant is sodium sulfate; the buffer is calcium acetate;
(3) The temperature is controlled at 60 ℃ during pickling, a roller box filled with acid liquor is statically soaked for 2 hours, then the dynamic circulation is carried out for 3-4 hours, the positive and negative alternate cleaning is carried out at intervals of 0.5 hour, specifically, a clockwise stirring rod and a anticlockwise stirring rod are adopted for stirring the acid liquor to form flowing liquor, and the pickling is completed;
after the pickling is finished, collecting the acid liquor for repeated use when the pH value of the acid liquor is more than 2, and diluting, neutralizing and then discharging the acid liquor when the pH value of the acid liquor is not more than 2;
(4) After the pickling is finished, preparing alkali liquor, and alkali washing the roller box by using the alkali liquor in a dynamic circulation mode;
the alkali solution is NaOH, N a 3 P0 4 And softened water, by mass: naOH:60-70%; n a 3 P0 4 :20-24%, softened water 6-8%, and water in balance, wherein the sum of the components is 100%;
after the alkali liquor is used, the PH value is within 8-10, and the special storage equipment is used for scrapping treatment;
(5) After the alkali washing is finished, repeatedly washing the roller box with clean softened water for 0.5 to h, and thoroughly washing residues in the roller box;
(6) Recording, namely strictly recording the time of each step in the cleaning process so as to check the cleaning effect;
(II) passivation
(I) Removing oil from the roller box after removing scale, wherein the oil removal is specifically to install polishing sheets on the roller box by adopting a polishing machine to clean the surface of the roller box with residual rust impurities;
(II) putting the roller box into another passivation pool again, carrying out pickling passivation treatment on the roller box in the pool, and controlling the temperature to be 5-30 ℃;
the specific pickling passivation treatment is as follows: firstly, placing the roller box in a pool for soaking for 24-48 hours, and then pulling out the roller box on a step placed in the pool, and carrying out pickling passivation for 5-15 minutes by adopting a brush brushing or spraying mode;
the pickling passivation treatment mode comprises soaking in pickling passivation solution, and brushing a roller box by dipping the pickling passivation solution by using a brush or adopting a mode of spraying the pickling passivation solution for treatment operation;
(III) washing with tap water until the tap water is clean;
(IV) collecting and intensively treating the wastewater generated in the passivation process, adding alkaline lime water or sodium hydroxide into the wastewater for neutralization, and discharging when the PH value is 6-9.
The use notice of the invention is as follows:
1. the pickling passivation solution operation must be performed outdoors or in a well ventilated room.
2. The operator wears the labor protection tool and then operates the tool, and the contact between the skin and the pickling passivation solution is strictly forbidden. If the touch is false, the touch can be immediately washed by clean water.
3. The vessel and the tool used for the pickling passivation treatment are acid corrosion resistant plastic tanks.
4. The residues and waste water after the pickling passivation solution is treated are neutralized by lime milk or sodium hydroxide in time to prevent environmental pollution.
5. The operation is not carried out in strong sunlight, and the effect of passivation is prevented from being influenced by the sun-drying of the stainless steel pickling passivation solution.
Disposal and discharge of waste liquid generated by the invention:
1. the chemical cleaning waste liquid in each stage is treated according to the specification of the integrated wastewater discharge standard and then discharged.
2. The chemical cleaning waste liquid of each stage is treated in situ and should be discharged to the appointed place of the factory.
3. The alkaline and acidic waste liquid is treated by a dosing neutralization method, and the neutralizing agent is hydrochloric acid, sodium hydroxide or ammonia water to adjust the PH value to be 6.0-9.0, and then discharged.
The cleaning quality requirements in the method of the invention are as follows:
the surface of the equipment and the pipeline are free of greasy dirt and impurities.
The safety measure of the invention is as follows:
1. 100KG sodium carbonate is prepared on site before construction, and acid liquor which may leak is prepared for neutralization so as to protect the environment and surrounding equipment.
2. The whole pickling area (including the place where the pipeline passes) is sealed by arranging guardrails or surrounding cloth, and the striking marks are attached to each access opening: acid washing is being performed and no personnel are available. If the pickling section involves the whole plant, the time must be properly scheduled to ensure that no one is involved in the construction process.
3. Every person entering the pickling area must wear the correct PPE chemical protective clothing, acid water boots, masks, industrial acid and alkali gloves, gas masks, etc. After contacting the leaking chemicals, it is necessary to flush with tap water immediately afterwards, and other personnel or surrounding equipment must not be touched at will.
4. The pickling area and each channel are monitored by special persons to ensure personal safety.
5. After the pickling is finished, the outer walls of the cleaning box and the connecting pipeline are firstly washed by tap water, gloves and the surrounding ground are washed, and the washing box is further washed by tap water after the soda surface is scattered, so that no residual acid liquor is ensured. Cleaning all temporary pipelines, cleaning boxes, temporary pumps and the like, flushing the whole pickling area with tap water, and cleaning away garbage.
6. And (5) removing all guardrails, collecting the surrounding cloth and the equipment covering cloth, and unsealing the whole pickling area.
The method of the invention is used for removing rust on the surfaces of the upper roller box and the lower roller box of the roller box straightener and carrying out subsequent anti-corrosion passivation treatment, so that the roller box is ensured to be free from corrosion in a service period, the repair of equipment parts caused by water or water vapor corrosion is mainly solved, and the problems of equipment precision stability and steel plate surface quality are effectively solved.
In addition to the embodiments described above, other embodiments of the invention are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the invention.
Claims (8)
1. The method for cleanly producing the roller box of the straightener is characterized by comprising the following steps of:
(one) cleaning scale
(1) Flushing the roller box by a high-pressure cleaner for open cleaning;
(2) Pouring acid liquor into a pickling tank, and then slowly placing the roller box into the pickling tank;
the acid liquor comprises the following components in percentage by mass: formic acid: 79-82%, buffer: 1.1-1.3%, surfactant: 0.7-0.9%, the balance being water, the sum of the components being 100%;
(3) The temperature is controlled at 60 ℃ during pickling, the roller box filled with acid liquor is statically soaked for 2 hours, then the dynamic circulation is carried out for 3-4 hours, and the positive and negative alternate cleaning is carried out every 0.5 hour during the dynamic circulation, so that the pickling is completed;
(4) After the pickling is finished, preparing alkali liquor, and alkali washing the roller box by using the alkali liquor in a dynamic circulation mode;
the alkali liquor is NaOH, N a 3 P0 4 And softened water, by mass: naOH:60-70%; n a 3 P0 4 :20-24%, softened water 6-8%, and water in balance, wherein the sum of the components is 100%;
(5) After the alkali washing is finished, repeatedly washing the roller box with clean softened water for 0.5 to h, and thoroughly washing residues in the roller box;
(II) passivation
(I) Removing oil from the roller box after removing the scale;
(II) putting the roller box into another passivation pool again, carrying out pickling passivation treatment in the pool, and controlling the temperature to be 5-30 ℃;
(III) washing with tap water until the tap water is clean;
(IV) collecting and intensively treating the wastewater generated in the passivation process, adding alkaline lime water or sodium hydroxide into the wastewater for neutralization, and discharging when the PH value is 6-9.
2. The method for clean production of leveler roll cassettes as recited in claim 1, wherein: and (3) cleaning the roller box sequentially from top to bottom during flushing in the step (1).
3. The method for clean production of leveler roll cassettes as recited in claim 1, wherein: the acid liquor in the step (2) comprises the following components in percentage by mass: formic acid: 81%, buffer: 1.2%, surfactant: 0.8%, water: 17%, the sum of the components is 100%.
4. The method for clean production of leveler roll cassettes as recited in claim 1, wherein: the surfactant is sodium sulfate; the buffer is acetate.
5. The method for clean production of leveler roll cassettes as recited in claim 1, wherein: the step (2) is characterized in that positive and negative alternate cleaning is carried out during acid cleaning, and specifically comprises the following steps: the acid liquor is stirred by a clockwise and anticlockwise stirring rod to form flowing liquor.
6. The method for clean production of leveler roll cassettes as recited in claim 1, wherein: and (3) after the pickling in the step (3), collecting the acid liquor for repeated use when the pH value of the acid liquor is more than 2, and diluting, neutralizing and then discharging the acid liquor when the pH value of the acid liquor is not more than 2.
7. The method for clean production of leveler roll cassettes as recited in claim 1, wherein: the step (I) of degreasing is specifically to install polishing sheets by adopting a polishing machine to clean the surface residual rust impurities of the roller box.
8. The method for clean production of leveler roll cassettes as recited in claim 1, wherein: the specific pickling passivation treatment of the roller box in the step (II) is as follows: firstly, placing the roller box in a pool for soaking for 24-48 hours, and then pulling out the roller box and placing the roller box on a step in the pool to carry out pickling passivation for 5-15 minutes by adopting a brush brushing or spraying mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311624781.7A CN117660972A (en) | 2023-11-30 | 2023-11-30 | Clean production method for roller box of straightener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311624781.7A CN117660972A (en) | 2023-11-30 | 2023-11-30 | Clean production method for roller box of straightener |
Publications (1)
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|---|---|
| CN117660972A true CN117660972A (en) | 2024-03-08 |
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| CN202311624781.7A Pending CN117660972A (en) | 2023-11-30 | 2023-11-30 | Clean production method for roller box of straightener |
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