CN111286744A - Swinging spraying pickling process and unit for alloy plates difficult to pickle - Google Patents

Swinging spraying pickling process and unit for alloy plates difficult to pickle Download PDF

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Publication number
CN111286744A
CN111286744A CN202010231241.2A CN202010231241A CN111286744A CN 111286744 A CN111286744 A CN 111286744A CN 202010231241 A CN202010231241 A CN 202010231241A CN 111286744 A CN111286744 A CN 111286744A
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pickling
section
alloy
difficult
pickle
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沈继刚
余海
林霞
李轲
杨春媚
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CISDI Engineering Co Ltd
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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
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • 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
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions

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  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The invention discloses a swing spray pickling process and a unit for alloy plates difficult to pickle, belonging to the technical field of pickling treatment. Compared with the traditional tank type pickling production technology, the swing spraying pickling technology not only solves the problems of environmental pollution and poor field operation environment, but also greatly improves the aspects of pickling yield, production efficiency, production cost and the like; compared with the continuous through type spray pickling technology of the current mainstream configuration, the swing spray pickling line not only inherits the advantages of good pickling quality, high production efficiency and low production cost, but also effectively reduces the length of the pickling passivation segment and saves the investment of engineering equipment.

Description

Swinging spraying pickling process and unit for alloy plates difficult to pickle
Technical Field
The invention belongs to the technical field of surface pickling treatment of stainless steel, high-temperature alloy, nickel-based corrosion-resistant alloy and non-ferrous alloy plates which are difficult to pickle, and particularly relates to a swinging spraying pickling process and a swinging spraying pickling machine set for alloy plates difficult to pickle.
Background
After hot rolling and heat treatment, an oxide layer with complex components and structure is formed on the surface of stainless steel and certain nonferrous alloy plates, the surface quality and corrosion resistance of products are seriously influenced by the oxide layer, and the stainless steel and certain nonferrous alloy plates are subjected to acid pickling passivation treatment to remove the oxide layer and form an oxide film which is bright and mainly comprises chromium, titanium and the like on the surface so as to achieve the purpose of passivation and corrosion resistance.
The acid pickling passivation treatment method for stainless steel, high-temperature alloy, nickel-based corrosion-resistant alloy, titanium, molybdenum and other non-ferrous alloy plates which are difficult to acid pickle generally comprises two acid pickling modes, namely a traditional tank type acid pickling mode and a currently popular continuous passing type acid pickling mode.
The traditional tank type pickling is to put alloy plates into a pickling tank for soaking, the production efficiency is low, the pickling quality is not well controlled, over-pickling is easily caused, in addition, a pickling medium is volatile, the field operation environment is poor, but the equipment in the form has a simple structure and less equipment investment.
In the current mainstream configuration two-section type continuous spray pickling technical mode, two groups of spray heads simultaneously carry out spray pickling on the alloy plate, so that the acid liquor is fully contacted with the surface of the plate, the utilization rate of the acid liquor is high, the consumption of the acid liquor is low, and the production and operation cost is relatively low; in addition, the pickling speed, temperature and other parameters of the unit can be adjusted on line, the over-pickling and under-pickling phenomena can be effectively avoided, and the production efficiency is greatly improved; in addition, although the spraying pickling is easier to generate acid mist, the whole pickling production line is continuously closed, and is provided with an acid mist exhaust purification system, so that the environment-friendly field operation environment can be effectively ensured. The method comprises a horizontal type pickling process and a vertical type pickling process, wherein the horizontal type pickling process comprises the following typical process flows: the method comprises the following steps of (1) alloy plate raw material → feeding → shot blasting → pre-cleaning → first section acid cleaning → 1# middle cleaning → second section acid cleaning → 2# middle cleaning → drying → blanking of the alloy plate finished product; the typical process flow of the vertical pickling is as follows: the method comprises the steps of alloy plate raw material → feeding → an inlet turning plate (87 degrees → shot blasting → pre-cleaning → first section acid cleaning → 1# middle cleaning → second section acid cleaning → drying → inspection grinding → an outlet turning plate (0 degrees → finished alloy plate blanking). In the two types of pickling, the plates are pickled in a passing mode, so that the pickling section is longer, the equipment investment is higher, and the unit capacity is larger in order to ensure the pickling quality.
In recent years, plate products of stainless steel, high-temperature alloy, nickel-based corrosion-resistant alloy, titanium and molybdenum non-ferrous alloy have small total market demand, and are more in variety classification, different in specification and small in batch. If the production is organized according to a through type spray pickling line operated on the current market, most production lines are not full, and the production lines are in stage shutdown conditions which are often generated in reality.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a swing spray pickling process and a machine set for alloy plates difficult to pickle, which can fully and effectively utilize the capacity of the machine set, greatly shorten the length of a pickling process section, ensure the pickling time by a swing pickling mode, thereby ensuring the pickling quality, reducing the equipment investment, and meeting the requirement of the annual production performance of a production line.
The invention is realized by the following technical scheme:
the invention provides a swinging spraying pickling process for an alloy plate difficult to pickle, which comprises the following steps of: the alloy plate is stacked after sequentially carrying out feeding, polishing, acid washing, rinsing, blowing, drying and discharging, and the method is characterized in that single-section mixed acid washing is adopted in an acid washing section, and the alloy plate in the acid washing section is circularly and periodically swung until the acid washing and passivation are completed.
Preferably, the one periodic oscillation is: and controlling the transmission roller way of the pickling section to rotate forward 5/4, rotate backward 3/4, rotate forward 1/4 and rotate backward 3/4 in sequence.
Preferably, the swing speed of the transmission roller way is controlled to be 2-6 m/min.
Preferably, the mixed acid is HF and HNO3And controlling HF and HNO3The concentration ratio of (A) to (B) is 3: 5-2: 11, and the temperature is 40-50 ℃.
The invention also provides a swing spray pickling line for the alloy plates difficult to pickle, which comprises a feeding sucker device, a feeding roller way, a shot blasting machine, a transition roller way, a pickling section, a rinsing section, a drying machine, a discharging roller way, a discharging sucker device, a rinsing circulating system and a pickling circulating system, and is used for realizing the pickling process.
Furthermore, the number of the swing alloy plates of the transmission roller way in the pickling section is at least one, and the length L of the pickling section is greater than the length L of the alloy platemaxThe length L of the alloy plate and the diameter D of the conveying roller bed are equal to the number n of the swinging alloy plates, namely Round ((L-150-5/4 pi D)/(L +500), 0), wherein L, LmaxUnits of l and D are mm.
Furthermore, the rinsing circulation system and the pickling circulation system are both set to be at least two sets of independent structures, and each set of pickling circulation system is configured with different acid liquor concentrations and temperatures according to different types of pickling alloy plates.
Further, acid mist exhaust purification systems are arranged in the acid washing section and the rinsing section.
Further, an air curtain blowing device is arranged at an outlet of the rinsing section.
The invention also provides a substituted difficult-to-acid-wash alloy plate swing spray pickling line, namely, the shot blasting machine, the pickling section and the rinsing section all adopt vertical structures to replace horizontal structures, the swing pickling line also comprises an inlet plate turnover machine arranged in front of the shot blasting machine, and a maintenance and grinding section and an outlet plate turnover machine which are sequentially arranged behind the drying machine, and the outlet plate turnover machine also replaces a blanking roller way.
The invention has the advantages that:
1. compared with the traditional tank type pickling production technology, the method can effectively overcome various defects of poor field operation environment, poor pickling yield, low production efficiency, high production cost and the like.
2. Compared with the two-section continuous through type spray pickling technology which is mainly configured at present, the pickling method has the advantages that the pickling effect can be effectively ensured only by arranging one section of mixed acid pickling section, the length of the pickling section is effectively shortened, and the equipment investment is reduced.
In conclusion, the swinging spray pickling technology effectively overcomes the defects of the two types of pickling, but simultaneously retains the respective advantages of the two types of pickling, and has higher popularization and application values on the premise of low requirement on the unit productivity. Meanwhile, the process is suitable for pickling plate-shaped products of stainless steel, high-temperature alloy, nickel-based corrosion-resistant alloy, titanium and molybdenum non-ferrous alloy, and because the total market demand of the products is not large, the products are classified into multiple varieties and have various specifications, the phenomena that a through type spray pickling line is adopted for organizing production, most production lines are not full, and the production lines are stopped periodically are avoided.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a plan view of the table of the present invention;
FIG. 2 is a vertical layout of the horizontal pickling line assembly of the present invention;
FIG. 3 is a floor plan of FIG. 2;
FIG. 4 is a cross-sectional view of the pickling section or the rinsing section of FIG. 2;
FIG. 5 is a vertical layout of the vertical pickling line assembly of the present invention;
FIG. 6 is a floor plan of FIG. 5;
FIG. 7 is a cross-sectional view of the pickling section or the rinsing section of FIG. 5;
reference numerals: the device comprises a feeding sucker device 1, a feeding roller way 2, a shot blasting machine 3, a transition roller way 4, a pickling section 5, a rinsing section 6, a dryer 7, a blanking roller way 8, a blanking sucker device 9, a rinsing circulating system 10, a pickling circulating system 11, an acid mist air draft purification system 12, an inlet panel turnover machine 13, a maintenance and polishing section 14 and an outlet panel turnover machine 15; a transmission roller way 51 and an acid distributing pipe 52.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
The oscillating spray pickling process for the alloy plate difficult to pickle provided by the embodiment is realized as follows: the alloy plate needing pickling is fed and then enters a shot blasting machine for shot blasting treatment to remove an oxide layer on the surface of the alloy plate and loosen a residual oxygen layer structure layer, then is conveyed into a closed spray pickling section through a roller way for swing type mixed acid pickling and passivation treatment, enters a rinsing section for through type washing after the spray pickling is finished, and finally is blown by compressed air and dried by hot air to be stacked through a sucker. The process route is as follows: raw material alloy plate → shot blasting → mixed acid pickling → rinsing water rinsing → compressed air blowing → hot air drying → alloy acid pickling finished plate. The acid washing process is suitable for acid washing of various stainless steel, high temperature alloy, nickel base anticorrosive alloy, titanium, molybdenum and other non-ferrous alloy plate products difficult to acid washing.
Specifically, the swing spray pickling line has two modes, namely a horizontal mode and a vertical mode.
As shown in fig. 2-4, the main equipment of the horizontal unit comprises: the device comprises a feeding sucker device 1, a feeding roller way 2, a horizontal shot blasting machine 3, a transition roller way 4, a horizontal pickling section 5, a horizontal rinsing section 6, a dryer 7, a discharging roller way 8, a discharging sucker device 9, a rinsing circulation system 10 and a pickling circulation system 11. Thus, the raw material alloy plates are fed one by one to a feeding roller way 2 through a feeding sucker device 1, then sent to a horizontal shot blasting machine 3 for shot blasting on the upper and lower surfaces, the alloy plates after being thrown are sent to a horizontal pickling section 5 through a roller way after shot blasting for swing spray pickling, after the pickling is finished, the swing alloy plates are sent to a horizontal rinsing section 6 for through rinsing, the rinsed alloy plates are dried in a drying device 7 and then sent to a blanking roller way 8, and finally blanking and stockpiling are carried out through a blanking sucker device 9.
As shown in fig. 5-7, the main equipment of the vertical unit comprises: the device comprises a feeding sucker device 1, a feeding roller way 2, a vertical shot blasting machine 3, a transition roller way 4, a vertical pickling section 5, a vertical rinsing section 6, a dryer 7, a discharging sucker device 9, a rinsing circulating system 10, a pickling circulating system 11, an inlet panel turnover machine 13, a maintenance and grinding section 14 and an outlet panel turnover machine 15. Thus, raw material alloy plates are fed one by one to a feeding roller way 2 through a feeding sucker device 1, then turned to an approximate 90 degree through an inlet panel turnover machine 13 and then sent to a vertical shot blasting machine 4 for shot blasting on the upper and lower surfaces, the alloy plates after being thrown are sent to a vertical pickling section 5 through a post-shot blasting roller way for swing spray pickling, after the pickling is completed, the swing alloy plates are sent to a vertical rinsing section 6 for through type rinsing, the rinsed alloy plates are dried by a drying device 7 and then sent to an overhaul and grinding section 14, and finally, the alloy plates are turned back to a horizontal state through an outlet panel turnover machine 15 and then are discharged and stockpiled through a discharging sucker device 9.
The shot blasting method adopts the mechanical dephosphorization method which is most widely applied at present, and the principle is that fine granular steel shots are sprayed to impact the surface of the plate so as to remove partial oxidation layers and loose residual oxygen layer structure layers on the surface.
The acid washing process adopts single-stage mixed acid (HNO)3+ HF) acid cleaning, wherein the machine type adopts a closed and spray acid cleaning mode. Compared with the two-section spray pickling section which is mainly configured in the current market, the length of the swing pickling section can be shortened to 40% of the original length. Meanwhile, the alloy plate is conveyed by a thermal composite acid-resistant embossing roller at a horizontal acid washing section, and a plurality of groups of acid distributing pipes 52 which are arranged up and down are arranged in a closed acid tank; and the bottom is adopted in the vertical pickling sectionThe guide roller is used for conveying in a conveying mode, and a plurality of left and right acid distributing pipes are arranged in the closed groove. Each group of acid distribution pipes can be connected with two independent acid washing circulating systems 11 (comprising a circulating pump, a heat exchanger, a bypass pump, a pipe valve and the like), and can be quickly switched according to different types of acid washing. Different acid liquor concentrations and temperatures can be configured for each set of circulating system so as to meet the requirements of different types of plate acid washing processes. Typical HNO3+ HF mixed acid process parameters are shown in Table 1 below:
TABLE 1 typical HNO3+ HF mixed acid technological parameter table
Figure BDA0002429344640000051
As shown in fig. 1, the alloy plate is cyclically and periodically swung in the pickling section, and the swinging pickling strategy is to control a transmission roller way 51 arranged in the alloy plate to cyclically and positively rotate when the alloy plate is pickled, and is specifically completed in four steps, namely, the transmission roller way is controlled to rotate forward 5/4 in the first step, the transmission roller way is controlled to rotate backward 3/4 in the second step, the transmission roller way is controlled to rotate forward 1/4 in the third step, the transmission roller way is controlled to rotate backward 3/4 in the fourth step, finally, the alloy plate returns to the original point, and the alloy plate is circulated back and forth in the above way until the pickling and passivation of the alloy plate are completed, and the alloy plate is conveyed to the rinsing section for cleaning through the transmission roller way after the pickling; the swing speed of the transmission roller table is between 2 and 6 m/min. Of course, the number of times and the rotation manner of the swing are not exclusive, and only the present embodiment is needed, as long as the periodic swing is conformed and the swing is returned to the origin.
The length (L, mm) of the pickled section is usually slightly larger than the maximum length (L) of the alloy plate to be processedmaxMm) and the alloy plate can not exceed the pickling section when the roller table rotates forward 5/4 turns. According to the length (L, mm) of the alloy plate to be pickled and the diameter (D, mm) of the conveying roller way, one or more alloy plates can be selected to swing in the groove of the pickling section at the same time, and the number n of the swinging alloy plates is equal to Round ((L-150-5/4 pi D)/(L +500), 0).
The alloy plate after acid washing enters a rinsing section for cleaning, the structural form of the alloy plate is similar to that of the acid washing section, and an upper header, a lower header (or a left header and a right header) are adopted for spraying. The spraying of the pickling section and the rinsing section is carried out in the closed cover, and the acid mist exhaust purification system 12 is matched, so that the cover is in a micro negative pressure state, the acid mist is prevented from escaping, and the field operation environment is effectively guaranteed.
A special air curtain blowing device and a special drying device are arranged at an outlet of the rinsing section, and residual moisture on the surface of the cleaned alloy material is blown away by compressed air; and (4) rapidly drying the surface moisture of the plate by using a hot air drying device, and then feeding the plate into an acid washing blanking section.
Compared with the traditional tank type pickling production technology, the swing spray pickling line can effectively overcome various defects of poor field operation environment, poor pickling yield, low production efficiency, high production cost and the like; compared with the two-section continuous through type spray pickling technology which is mainly configured at present, the pickling effect can be effectively ensured only by arranging one section of mixed acid pickling section, the pickling section length is effectively shortened, and the equipment investment is reduced. The swinging spray pickling process technology can effectively overcome the defects of two traditional types of pickling, but simultaneously keeps the respective advantages of the two types of pickling, and has higher popularization and application values on the premise of low requirement on the unit capacity.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A swing spray pickling process for an alloy plate difficult to pickle comprises the following steps: the alloy plate is stacked after sequentially carrying out feeding, polishing, acid washing, rinsing, blowing, drying and discharging, and the method is characterized in that single-section mixed acid washing is adopted in an acid washing section, and the alloy plate in the acid washing section is circularly and periodically swung until the acid washing and passivation are completed.
2. The difficult-to-pickle alloy plate swing spray pickling process according to claim 1, wherein one periodic swing is as follows: and controlling the transmission roller way of the pickling section to rotate forward 5/4, rotate backward 3/4, rotate forward 1/4 and rotate backward 3/4 in sequence.
3. The alloy plate difficult to pickle in the process of claim 1 or 2, wherein the swinging speed of the transmission roller way is controlled to be 2-6 m/min.
4. The process for pickling difficult-to-pickle alloy plate by swing spraying according to claim 1, wherein the mixed acid is HF and HNO3And controlling HF and HNO3The concentration ratio of (A) to (B) is 3: 5-2: 11, and the temperature is 40-50 ℃.
5. The utility model provides a difficult pickling alloy board swing sprays pickling line, includes material loading sucking disc device (1), material loading roll table (2), shot-blasting machine (3), transition roll table (4), pickling section (5), rinsing section (6), drying-machine (7), unloading roll table (8), unloading sucking disc device (9), rinsing circulation system (10) and pickling circulation system (11), its characterized in that for realizing the pickling process of any claim 1-4, shot-blasting machine, pickling section, rinsing section are horizontal structure, the pickling section adopts single section mixed acid pickling, and transmission roll table (51) that sets up in it adopts circulating periodic positive and negative rotation when pickling the alloy board.
6. The oscillating spray pickling line for difficult-to-pickle alloy plates according to claim 5, wherein the number of the blocks of the oscillating alloy plates of the drive roller table in the pickling section is at least one, and the length L of the pickling section is greater than the length L of the alloy platemaxThe length L of the alloy plate and the diameter D of the conveying roller bed are equal to the number n of the swinging alloy plates, namely Round ((L-150-5/4 pi D)/(L +500), 0), wherein L, LmaxUnits of l and D are mm.
7. The oscillating spray pickling line for alloy plates difficult to pickle according to claim 5, wherein the rinsing circulation system and the pickling circulation system are arranged into at least two independent structures, and each pickling circulation system is configured with different acid solution concentrations and temperatures according to different types of pickled alloy plates.
8. The oscillating spray pickling line for alloy plates difficult to pickle according to claim 5, wherein the pickling section and the rinsing section are both provided with an acid mist draft purification system (12).
9. The difficult pickling alloy plate swing spray pickling line of claim 5, wherein an air curtain blowing device is arranged at the outlet of the rinsing section.
10. The oscillating spray pickling line for alloy plates difficult to pickle according to any one of claims 5 to 9, wherein the shot blasting machine, the pickling section and the rinsing section all adopt a vertical structure to replace a horizontal structure, the oscillating pickling line further comprises an inlet plate turnover machine (13) arranged in front of the shot blasting machine, and an overhauling and grinding section (14) and an outlet plate turnover machine (15) which are sequentially arranged behind the drying machine, and the outlet plate turnover machine also replaces a blanking roller way.
CN202010231241.2A 2020-03-27 2020-03-27 Swinging spraying pickling process and unit for alloy plates difficult to pickle Pending CN111286744A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7902440L (en) * 1978-03-20 1979-09-21 Schering Ag DEVICE FOR TREATMENT OF CLEAN GOODS
CN201003070Y (en) * 2006-04-27 2008-01-09 江苏晨力实业有限公司 Closed type single-sheet stainless steel plate continuous pickling system
CN102051626A (en) * 2009-11-06 2011-05-11 江苏晨力实业有限公司 Semicontinuous pickling line for alloy plates and strips
CN102337547A (en) * 2010-07-15 2012-02-01 宝山钢铁股份有限公司 Pickling method for hot rolled double-phase stainless steel plates
CN102719831A (en) * 2012-05-29 2012-10-10 中冶南方工程技术有限公司 Method for removing scales on surface of hot-rolled stainless steel strip

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7902440L (en) * 1978-03-20 1979-09-21 Schering Ag DEVICE FOR TREATMENT OF CLEAN GOODS
CN201003070Y (en) * 2006-04-27 2008-01-09 江苏晨力实业有限公司 Closed type single-sheet stainless steel plate continuous pickling system
CN102051626A (en) * 2009-11-06 2011-05-11 江苏晨力实业有限公司 Semicontinuous pickling line for alloy plates and strips
CN102337547A (en) * 2010-07-15 2012-02-01 宝山钢铁股份有限公司 Pickling method for hot rolled double-phase stainless steel plates
CN102719831A (en) * 2012-05-29 2012-10-10 中冶南方工程技术有限公司 Method for removing scales on surface of hot-rolled stainless steel strip

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