KR101406666B1 - Apparatus for manufacturing slag bead and method for removing scale on hot rolled steel strip - Google Patents

Abstract

Provided are a device to manufacture a slag abrasive material, capable of improving the quality of hot-rolled steel strips by manufacturing convertor or electric furnace slag generated in an iron manufacturing industry for slag bead to process the surface of a material and effectively remove scale from the hot-rolled steel strips using the device, and a method to remove scale from the hot-rolled steel strips. According to the present invention, the device to manufacture a slab abrasive material comprises a device housing and a drum unit arranged on the device housing to be rotated, and a slag abrasive material process discharged by putting the unprocessed slag bead quenched in a molten state and a wear material therein.

Description

TECHNICAL FIELD [0001] The present invention relates to a slag abrasive producing apparatus and a scale removing method for a hot rolled steel strip,

The present invention relates to a slag abrasive for slag abrasive for surface treatment of materials used in the iron and steel industry and to effectively remove the surface scale of the hot-rolled steel sheet using the slag abrasive produced thereby to improve the quality of the hot- To a method for manufacturing a slag abrasive product and a method for removing scale of a hot-rolled steel strip.

Slag, which is a byproduct produced in large quantities in the steelmaking process, is generated, for example, in a converter or electric furnace process. In the case of such slag, however, it is extremely weak in terms of its processing and recycling Only a few of them are used after a period of aging of about 1 ~ 2 months, and most of them are landfilled.

That is, in a conventional slag treatment, the molten slag, which is approximately 1200 to 1500 ° C., is allowed to cool in the air, and the solidified slag mass is pulverized by a large-sized equipment so that the iron component can be used again as a steel source Recovered, separated by size, partially recycled, and the remaining slag from which iron is removed, is mostly used as an aggregate in landfill or road pavement.

In addition, in the case of conventional slag treatment or recycling, expensive equipment such as a pulverizer, a magnetic conveyor, a sorter, and the like are required to be excessively expensive. In particular, in the case of buried slag, There are other derivatives problems such as expansion, subsidence, and leaching of heavy metals.

When the slag is cooled by spraying water on top of the slag generated in the converter or electric furnace, the heat transfer rate of the slag is low and the heat capacity of the slag itself is large, so that it takes a considerable time to cool the slag as a whole.

Therefore, as described in the following FIG. 3, spherical slag having a spinel structure is formed through a process of 'atomizing' the molten slag generated during the operation of a converter or electric furnace, Techniques relating to the treatment of slag with no heavy metal leaching and expansion are known.

On the other hand, there has been no example in which spherical slag (hereinafter referred to as "slag bead") subjected to the ordinary cooling or atomization treatment is applied to remove the surface scale of the hot-rolled steel sheet (steel sheet).

However, as described in the following FIGS. 8A and 8B, the slag bead subjected to the atomization treatment is used for removing the scale of the hot-rolled steel strip without any additional processing, It is more preferable to remove the surface scale of the hot-rolled steel strip by using an abrasive.

On the other hand, a hot-rolled steel strip (carbon steel, high-strength steel, silicon-added steel for stainless steel or stainless steel) hot-rolled at a high temperature produces a scale layer having a thickness of about 5 to 15 μm on the surface.

FIG. 1 shows an apparatus for removing scales generated on the surface of a steel sheet as described above. The removal method is to chemically remove the hot-rolled scale from the surface of the steel sheet by using a strong acid such as hydrochloric acid or sulfuric acid .

That is, as shown in FIG. 1, a pickling facility for removing a commonly known conventional scale is configured to generate cracks (cracks) on the scale using the scale breaker 330, The scale was removed by gradually passing through the bath 350.

The pickling tank 340 is generally composed of four unit pickling tanks 342, 344, 346 and 348. In the pickling tanks, a high-temperature strong acid such as hydrochloric acid or sulfuric acid is mainly used to chemically remove the scale of the hot-

In FIG. 1, reference numeral 310 denotes a payoff reel, 320 denotes a welding machine, and 360 denotes a tension reel. The water bath 350 may be divided into a brush and a rinse cleaning step although not shown in detail.

That is, the conventional scale treatment method of FIG. 1 is effective in increasing the length of equipment due to the use of a large number of pickling tanks and water tanks, inhibiting the working environment due to the generation of acid vapors, causing environmental hazard due to waste acid treatment, There have been various problems such as an increase in the number of auxiliary facilities, a scale removal capability depending on the type of steel, poor quality of the steel plate stuck in the acid solution tank and the water tank at the time of line stoppage.

In addition, although schematically shown in FIG. 1, since the length of the actual pickling bath 240 and the water bath 250 are about 100 m in the scale removal method using the conventional pickling process, when the line is stopped, The hot-rolled steel sheet in the water bath was poor in surface quality due to excessive acid treatment.

Therefore, in order to replace the chemical scaling method using such an acid solution, a metal shot ball or a grit, or a slurry prepared by mixing a metal short ball or a grits with water is sprayed on the surface of a steel sheet to form a physical A technique of removing the surface scale of a steel sheet is disclosed in, for example, JP Publication Nos. 2002-532633, JP Patent Publication 2002-275666 and JP Patent Publication 2002-371314.

However, the pretreatment process for increasing the pickling efficiency is used in combination with the pickling process, and it is difficult to completely remove the pickling process. In addition, there is known a method of spraying other high-pressure water or spraying ice particles. However, It is unclear.

In addition, a scale removal method using high-pressure water spray is disclosed in JP Patent Publication (Kokai) No. 2004-74178, and a scale removal method using ice particle spraying is proposed in US 6,328,631. However, it is also unclear whether or not scale removal performance and practical use.

JP-A-2003-064461 and US Pat. No. 6,088,895 propose a facility and a treatment method in which a physical scale removal process and a rolling or plating process are continuously connected to each other. However, JP Publication No. 2003-064461 discloses a tension leveler Shot blasting method is used but it is used as an auxiliary means while keeping the existing pickling.

In US 6,088,895, the scale is removed by two-step brushing after tensile leveling and short-bracing, and the surface roughness is adjusted to a certain range to finely adjust the average roughness of the surface to 0.3 μm or less by the subsequent cold rolling And the object is limited to a stainless steel cold-rolled steel sheet requiring a beautiful surface roughness.

However, in the case of stainless steel hot-rolled steel sheets, it is difficult to remove the scale by only the method of the patent, and it is practically applied in combination with the pickling process.

In addition, it is difficult to obtain uniform surface roughness of a steel sheet when a metal shot ball, a grit, or a polishing slurry obtained by mixing them is sprayed onto the surface of a hot-rolled steel strip. In actual continuous use, due to an excessive specific gravity difference with water, .

In addition to metal-based abrasives, other abrasive materials such as silicon oxide, silicon carbide, aluminum oxide, glass beads, and ceramic beads are used as abrasives in powder form or in the form of a slurry solution premixed with water Although it is used, there are problems in terms of strength, economy, and mass use.

Accordingly, the present invention relates to a method for manufacturing a slag abrasive product by processing a slag or a slag abrasive material for electric arc furnace slag produced in a steel making industry and effectively using the slag abrasive for surface scaling of the hot-rolled steel strip to improve the quality of the hot- And to provide a slag abrasive manufacturing apparatus and a method for removing scale of a hot rolled steel strip.

Technical Solution [10] In order to achieve the above-mentioned object, according to an aspect of the present invention, And a drum means rotatably provided in the apparatus housing and configured to discharge a slag abrasive material into which slag beads and abrasive materials rapidly cooled in a molten state have been charged and processed,
The drum unit further includes a concavo-convex portion formed on the inner surface of the cylindrical drum and provided to improve abrasiveness, the concavo-convex portion including a cylindrical drum into which slag beads and a wear material are inserted and is rotatably provided in association with the rotating body The slag abrasive producing apparatus comprising:

Further, as another embodiment of the technical aspect, the present invention provides an apparatus comprising: a device housing; And a drum means rotatably provided in the apparatus housing and configured to discharge a slag abrasive material into which slag beads and abrasive materials rapidly cooled in a molten state have been charged and processed,
And a supersonic wave applying means provided through the apparatus housing and the drum means.

And, as yet another embodiment of the technical aspect, the present invention provides an apparatus comprising: a device housing; And a drum means rotatably provided in the apparatus housing and configured to discharge a slag abrasive material into which slag beads and abrasive materials rapidly cooled in a molten state have been charged and processed,
The abrasive material is provided as a steel ball, and the discharged steel ball is recycled to the inlet side of the apparatus.

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Further, as another technical aspect, the present invention provides a method of manufacturing a steel sheet, comprising the steps of: treating a steel sheet having a scale formed thereon with a scale breaker; And a step of spraying a polishing slurry containing the rapidly cooled slag bead or slag abrasive on the surface of the hot-rolled steel strip which proceeds through the polishing slurry spraying unit to remove the scale,
Wherein the polishing slurry comprises a slag abrasive material provided through the slag abrasive producing device,
The polishing slurry may include high-pressure water supplied into the polishing slurry spraying unit; The present invention also provides a method for removing scales in a hot-rolled steel strip in which a mixture of water and a slag abrasive mixture or a slag abrasive is mixed and sprayed at a high pressure to remove the surface scale of the hot-rolled steel strip.

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According to the present invention, slag, which is a by-product generated in a converter or an electric furnace, can be manufactured as a slag abrasive having suitable strength and shape as an abrasive so that it can be used for scaling, and ultimately, In addition, the recyclability of the slag that is already buried is also excellent. Therefore, the present invention provides an economic advantage through recycling slag.

In addition, since the slag abrasive obtained by processing the rapidly cooled slag bead is used as a polishing slurry obtained by mixing water with the slurry, the spraying of the polishing slurry using known abrasives such as glass or ceramics The scale removal is superior to the scale processing through the scale, and the scale removal with excellent economy is realized.

1 is a process diagram showing a conventional continuous pickling process of a hot-
Fig. 2 is an overall process diagram showing a scale removal process of a hot-rolled steel strip according to the present invention
3 is a schematic view showing a slag bead production process through rapid cooling of molten slag according to the present invention
FIG. 4 is a schematic view showing the entire configuration of a slag abrasive product manufacturing apparatus according to the present invention for manufacturing (processing) a rapidly cooled slag bead as a scale-removing slag abrasive
Fig. 5 is an exploded perspective view showing the apparatus of the present invention shown in Fig.
6 is a diagram showing the detailed construction of the polishing slurry ejecting unit according to the present invention shown in Fig. 2
7 is a schematic view showing a recycling process of the scale removing process of the present invention
8A and 8B are photographs showing an enlarged view of the rapidly cooled slag bead and the slag abrasive material processed by the manufacturing apparatus of the present invention
9A and 9B are graphs showing hot rolled steel strips processed through the first and second embodiments of the present invention

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described (with reference to the accompanying drawings). However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. (The shape and size of elements in the drawings may be exaggerated for clarity.)

FIG. 2 shows a scale removal process of the hot-rolled steel strip according to the present invention. FIG. 3 shows a process of rapidly cooling slag in a molten state. In FIGS. 4 and 5, FIG. 6 shows a slag abrasive manufacturing apparatus according to the present invention, in which a slag bead is processed to provide a slag abrasive suitable for removing scale of a steel sheet, and FIG. 6 shows the abrasive slurry spraying unit of FIG.

However, in the following description of the present embodiment, the slag particles treated by the rapid cooling of the molten slag shown in Fig. 3 will be described as slag beads SB. In the slag abrasive product manufacturing apparatus shown in Figs. 4 and 5, And the processed slag beads produced by further processing are classified into slag abrasives SB '.

First, FIG. 3 shows a process for rapidly cooling the molten slag S according to the present invention.

3, the molten slag S is supplied to the tiltable tundish 220 through the slag port 210 filled with the molten slag S, and the molten slag S1 is discharged from the nozzle 230 according to the inclination of the tundish, The melted slag is immersed in the first water tank 240 formed in the pit while being changed into granules by nature and quenched by colliding with the gas G injected at a high angle from the high pressure at a predetermined angle.

At this time, the high-velocity gas atomized slag particles (spherical slag particles), that is, the slag beads SB are transferred to the second water tank 250 formed in the pit and finally the slag beads SB).

3, the slag beads SB that have been finally cooled in the second tank are collected in a transport bag (container) 280 via the bucket elevator 260 and the dispenser 270, .

For example, the slag beads SB have an average particle size of 300 to 1000 mu m as a result of rapid cooling in a water bath while colliding with a high velocity gas in a molten state, and the hardness of the particles at this time is higher than Mohs hardness 7, As shown in Fig.

However, as can be seen from the photograph of FIG. 8A, since the slag beads SB colliding with the high-speed jet gas and having been subjected to water treatment have corners formed on the surface of the particles, it is also possible to use them for descaling of hot- Yes. The present invention provides a slag abrasive product manufacturing apparatus of the present invention shown in Figs. 4 and 5, which is more suitable for scale removal.

Therefore, the present invention proposes a slag abrasive material producing apparatus shown in Figs. 4 and 5 for reworking the first quench-treated slag bead SB.

8B, the slag abrasive SB 'provided through the apparatus 1 for producing a slag abrasive according to the present invention has an average particle size of about 250 μm and a particle hardness of Moh's hardness of 8 or more, And a more spherical slag abrasive SB 'on the surface, where the edges such as the slag beads SB of FIG. 8A are removed.

Of course, even in the case of the slag bead of Fig. 8A, since it is excellent in rigidity, it is not impossible to use it for scaling off the hot-rolled steel strip.

Next, an apparatus 1 for manufacturing slag abrasive material of the present invention shown in Figs. 4 and 5 is basically provided with an apparatus housing 10, a rotatably provided apparatus housing 10, And a drum means 30 configured to discharge the slag abrasive SB before the processing and the abrading material 2, for example, the steel ball 2 into which the processed slag abrasive SB 'is put.

Therefore, the apparatus 1 for providing the slag abrasive slurry SB 'for scaling according to the present invention is characterized in that the drum means 30 is rotated and the slag beads SB and the steel balls 2, By mixing and injecting, the slag beads SB of FIG. 8A colliding with the steel ball 20 can be provided with the processed slag abrasive SB '(processed slaved vivid) in a form useful for the descaling of FIG. 8b will be.

4 and 5, the apparatus housing 10 of the apparatus 1 for manufacturing a slag abrasive according to the present invention comprises a main body portion 12 in which the drum means 30 is rotatably seated therein, And the cover portion 14 can be provided separately.

The main body portion 12 and the cover portion 14 include the flange portion F and are rotatably mounted on the drum unit 30 while being separated and assembled. At this time, the inside of the body portion 12 may be provided as a hollow cylindrical body.

4 and 5, the slag abrasive manufacturing apparatus 1 of the present invention is provided between the main body portion 12 of the apparatus housing and the drum means 30 so that the drum means can be rotated And further includes a rotating body 50 provided.

That is, the rotating body 50 of the present invention has a rotating shaft portion 54 through which the motor 52 penetrates the hole formed in the cover portion 14 of the apparatus housing, And a rotating body 58 which is connected to the outside of the drum means 30 via a shaft 56 and which is rotatably provided through a bearing element to the body portion of the apparatus housing.

Therefore, when the motor 52 is rotationally driven, the rotary shaft portion 54, the connecting rod 56, and the rotary body 58 are integrally rotated, and the drum means 30 assembled to the rotary body 58 also rotates integrally The slag beads SB and the steel balls 2 which are injected into the slag beads collide with each other while the surface portion of the slag beads is polished.

At this time, the slag beads (particles) SB and the steel balls 2 are fed into the space between the connecting rods 56 into the drum unit 30. [

4 and 5, the drum unit 30 includes a polishing space 32 in which slag beads SB and steel billets 2 are charged into the inside of the drum unit 30 and the surface of the slag beads is polished during rotation, And an inner surface of the cylindrical drum is provided with concave and convex portions 34 for improving the abrasion property.

At this time, the cylindrical drum 32 is assembled with bolts to the nail portion of the rotating body 58 of the rotating body 50, and the rotating body 58 is attached to the apparatus main body 14 of the apparatus housing 10, The rotating shaft portion 54 of the rotating body 50 is supported by the bearing portion BR on the cover portion 14 and is assembled separately at the lower portion of the apparatus main body 14 The bearing member BR for supporting the cylindrical drum 32 of the drum means 30 can also be assembled to the bottom member 16. [

Therefore, when the slag abrasive product manufacturing apparatus 1 of the present invention is rotated at a high speed, the slag beads (particles) SB, which are rapidly cooled and rapidly cooled in the steel drum, can be processed while colliding with the steel balls.

4 and 5, the rapidly cooled slag bead SB and the steel ball 2 are formed in the cover portion 14 to be assembled to the main body portion 12 of the apparatus housing 10 The inlet pipe 18 may be connected to the inlet pipe 20 having a large diameter and the inlet may be adjusted by a valve controlled by the control unit C, have.

For example, when the transfer turret 280, from which the first-order rapidly cooled slag beads SB are collected as shown in FIG. 3, is transferred to the transfer device 26 and reaches the charging position of the charging tube 20, The steel ball 2 can be injected into the injection tube 20 through the conveyor c / v from the hopper H based on automation into the cylindrical drum 32 of the apparatus upon opening of the valve.

At the same time, the slag abrasive material SB 'and the steel ball 2 are discharged through the discharge port 36 penetrating the bottom portion 16 of the main body portion 12 of the apparatus housing in the apparatus of the present invention. A discharge pipe 22 having a valve can be connected.

Therefore, the slag abrasive material SB 'and the steel ball 2 processed through the rotation operation of the drum unit through the control of the control unit C of the motor are first charged into the magnetic separator 24 through the discharge port and the discharge pipe, At this time, the slag bead and the steel ball 2 are dropped on the respective conveyors (c / v), the steel ball is again sent to the hopper H, and the slag bead, which is a machined slag bead, The abrasive material SB 'is supplied to the polishing slurry spraying unit 100 of the present invention shown in Fig. 2 and is used for descaling the hot-rolled steel strip.

4 and 5, the inner hollow surface of the cylindrical drum 32 of the drum unit 30 of the present invention is provided with a steel ball, a concavo-convex portion 34 for further processing the surface of the slag bead, And the motor 52 can perform the control operation of the apparatus in association with the valve and the control unit C. [

Particularly, it is preferable that the motor is a thermo-motor and uses a motor whose rotation angle can be easily controlled. Since the discharge port 36 of the cylindrical drum 32 and the discharge port 18 of the bottom portion 16 are integrally positioned to be discharged, when the motor is operated to a predetermined set position through the control unit, The outlet of the drum is controlled to coincide with the position of the bottom discharge, and the discharge tube 22 is flanged to the bottom.

Therefore, the input, processing and discharge of the slag bead SB to the cylindrical drum 32 of the present invention and the processed slag abrasive SB 'can be controlled.

In addition, in the apparatus of the present invention, ultrasonic wave applying means 70 may further be provided passing through the rotation center of the bottom portion 16 of the apparatus housing 10 and the cylindrical drum 32 of the drum means 30. [

Of course, the ultrasonic wave application means 70 is known, and the ultrasonic wave application means 70 is inserted into the bearing component BR through the rotation center of the cylindrical drum so as to be capable of rotating the cylindrical drum, The outer casing (not shown) of the drum may also serve to support the rotation of the cylindrical drum.

As a result, the slag abrasive product manufacturing apparatus of the present invention smoothes the primary rapidly cooled slack beads SB (particles) before machining by the main collision with the steel balls 2, and secondarily smoothes the inner slack portions of the cylindrical drum Further, the surface of the slag particles can be further treated by inducing a severe vibration collision between the slag particles and the steel through the application of ultrasonic waves.

Accordingly, the slag abrasive product manufacturing apparatus 1 of the present invention described above is rapidly cooled through collision with the high-speed jet gas and water treatment, so that the slab bead SB as shown in Fig. 8A, (SB ') suitable for use as a scaling material.

Next, in FIGS. 2 and 6 to 7, the slag in the molten state described so far is subjected to a rapid cooling treatment as shown in FIG. 3, and then the slag provided through the slag abrasive producing apparatus 1 of FIG. 4 to FIG. And the scale processing of the hot-rolled strip using the abrasive SB 'is shown.

However, in this embodiment, only the scale removal through the slag abrasive SB 'is shown and described, but as described above, scale removal using the slag bead SB is also possible.

2 shows the entire process of scaling down the hot-rolled steel strip. FIG. 6 shows the polishing slurry spraying unit 100, and FIG. 7 shows the steps of reprocessing the treated scale and polishing slurry 102 Respectively.

2 and 6, the method for removing scale of a steel sheet according to the present invention includes the steps of treating a hot rolled steel sheet (steel sheet) having a scale formed thereon with a scale breaker 330, And spraying the polishing slurry 102 including the slag abrasive SB 'provided through the polishing slurry injection unit 100 onto the surface of the steel sheet to remove the scale.

That is, when the spray water W sprayed at a high pressure into the polishing slurry spraying unit 100 provided in the chamber 101 through which the hot-rolled strip passes is mixed with water and the slag abrasive SB ' The blast slurry 102 is mixed with the injection water and the inside of the unit and finally sprayed on the surface of the hot-rolled steel strip S, so that the slag abrasive material having the excellent strength as shown in Fig. 8B collides with the surface of the hot- To be effectively removed.

At this time, the pressure of the high-pressure water W supplied to the inside of the housing 110 of the polishing slurry spraying unit 100 is suitably 100 to 500 bar, as shown in FIG. The polishing slurry sprayed from the polishing slurry spraying unit and the treated scale are preferably reprocessed to recycle the slag beads or slag abrasive.

The hot-rolled strip S passing through the polishing slurry spraying unit 100 and having its surface scaled off as shown in FIG. 2 is finally coiled in the winder through a washing step 350 and a drying step 355 have.

6, the polishing slurry spraying unit 100 according to the present invention is further provided with a high pressure water pipe (a high pressure water pipe) on the upper part of the main body 112 of the apparatus housing 110 spaced apart from the hot steel strip by a suitable height, And a high pressure water injection hole 116 in which a high pressure water nozzle 122 is assembled is installed in the body 112 so that the high pressure water W is injected into the body 112 of the unit .

At the same time, the water W and the slag abrasive SB 'are mixed in advance through the slag abrasive supply part 120 provided on one side of the main body 112, through the supply line 118 to the inside of the main body 112 The water and the slag abrasive are strongly sucked into the main body 112 of the apparatus housing 110 through the formation of negative pressure inside the main body by the injected high pressure water and mixed while colliding with the high pressure water The abrasive slurry 102 (the mixture of water and the slurry RM abrasive is also a polishing slurry) is sprayed onto the surface of the hot-rolled steel strip at a high pressure through the nozzle 124 provided at the lower end of the main body.

In this case, the injection pressure of the high-pressure water W injected into the main body of the apparatus housing 110 is suitably in the range of 100-500 bar. For example, when the pressure is 100 bar or less, the scale removal efficiency is insufficient, The surface roughness of the hot-rolled steel strip is increased, and other power ratio and equipment cost are increased.

The gap between the lower end nozzle 24 of the polishing slurry spraying unit 100 of the present invention and the hot-rolled steel strip is preferably about 100 to 350 mm. For example, If the interval is less than 100 mm, the scale removal width is too narrow and the number of units actually arranged in the width direction of the steel sheet for scaling removal is increased. On the other hand, if the interval is 350 mm or more The removal ability of the scale is deteriorated.

6, since the nozzle 124 provided at the lower end of the main body 112 of the apparatus housing 110 is concavely formed at the center and the slit 124a is formed, the slag abrasive SB ' The polishing slurry 102 mixed with water (high-pressure water) can be spread in a uniform area in a uniformly mixed state in a concave portion of the nozzle and sprayed, thereby enhancing the scale removal efficiency.

2, a polishing slurry in which high-pressure water W and water and a slag abrasive SB 'are mixed is introduced into the tank T and the pump P in the polishing slurry spraying unit 100 of the present invention, And the sprayed abrasive slurry 102 and the removed scale (not shown) are collected and the slag abrasive SB 'is preferably recycled.

In the present embodiment, the water W and the slag abrasive SB 'are previously mixed and supplied to the inside of the main body 12 of the apparatus housing 110 of the injection unit 100. However, It is also possible to uniformly mix the high-pressure water and the high-pressure water in the inside of the unit so that the polishing slurry 102 is finally sprayed onto the surface of the hot-rolled steel strip.

Alternatively, high-pressure air may be supplied to the inside of the unit instead of the high-pressure water, and high-pressure polishing slurry injection may be realized even if water and slag abrasive are mixed and supplied to one side in advance.

That is, in the case of the present invention, since the polishing slurry 102 based on the slag abrasive SB 'having high strength is sprayed, the scale treatment efficiency is high and the surface roughness of the steel sheet is also uniform.

Next, FIG. 7 shows a recirculation configuration of the slag abrasive SB 'of the slag bead, which has been subjected to particularly processing, through the recovery of the abrasive slurry 102 that has been sprayed and collided against the surface of the steel sheet.

That is, as shown in Fig. 7, the abrasive slurry including the slag abrasive sprayed into the collecting tank (not shown) provided under the abrasive slurry spraying unit collides with the treated scale or steel sheet to collect the broken slag abrasive.

The aggregates collected in the collecting tank are transferred to the cyclone (CY) by the pump (P), the slag abrasive (SB ') and the water (W) are separated in the cyclone and the slag abrasive Is supplied to a stirring tank (M) to be supplied to the polishing slurry (102), and is introduced into the one inlet side of the polishing slurry spraying unit (100) through a pump (P).

At this time, the slag abrasive material SB 'supplied through the slag abrasive material manufacturing apparatus 1 of the present invention shown in FIGS. 4 and 5 is supplied to the hopper H and supplied to the stirring tank M through a screw feeder .

Next, the water W containing the scale passed through the cyclone CY can be injected through the filter F to supply the high-pressure water of the injection unit as the tank T and the pump P.

In the filter, the processed scale (unsigned) can be supplied to the hopper H and processed.

Although not shown in the drawing, the scale and the water can be separated and processed through the magnetic separator instead of the filter in Fig.

Hereinafter, the present invention will be described in detail with reference to examples.

(Example 1)

The hot-rolled steel strip (thickness 2.0 mm x width 1200 mm) was continuously passed through the treatment process of the present invention shown in Fig. 2 at a line speed of 50 mpm under the same condition as shown in Table 1 below. As a result, , The residual scale was less than 1% at the similar level and the average surface roughness of the hot - rolled band was 1.2 ㎛ (1.2 ~ 1.5 ㎛ for the pickling treatment) compared to the pickling treatment of the hot - rolled steel strip. Respectively.

division Treatment condition Scale breaker An elongation of 1.2%, a bending amount of 20 mm, a surface temperature of the steel sheet of 50? Polishing slurry spray conditions Slag abrasive (processed slag bead SB '), 200 μm particle size), internal high pressure water injection pressure of the injection unit 300 bar Injection condition Spray angle of unit is 15 degrees, gap between steel plate and nozzle is 200mm

9A shows a photograph of the surface of the hot-rolled steel strip treated with the slag abrasive (the processed slag abrasive SB 'in Fig. 8B) under the conditions shown in Table 1. In other words, The distinction between the parts is clear.

(Example 2)

The scale was processed by continuously feeding hot-rolled steel strips under the conditions shown in Table 2 below with a low carbon hot-rolled steel strip (thickness: 2.3 mm x width 1000 mm) at a line speed of 50 mpm, And the average surface roughness of the steel sheet was 2.5 ㎛, and the surface gloss of the hot - rolled steel strip was excellent.

division Treatment condition Scale breaker Elongation 2.5%, bending amount 30 mm, surface temperature of steel plate 50? Polishing slurry spray conditions The rapidly cooled slag beads SB of FIG. 8A, 300 m, injection pressure 300 bar Injection condition Spray angle 23 degrees, gap between nozzle and steel 150 mm

That is, in the case of Example 2, the slag beads SB before processing are used, which are not subjected to the slag abrasive material producing apparatus of the present invention shown in Fig. 8A and processed by the method of Fig. 3, It can be seen that the scale removal efficiency is higher than that of the first embodiment.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.

1 .... Slag abrasive manufacturing device 10 .... Device housing
30 .... drum means 50 .... rotating body
70 .... Ultrasonic applying means 100 .... Polishing slurry spraying unit
SB .... Slag beads SB '.... Slag abrasive

Claims (13)

A device housing (10); And slag beads SB which are rotatably provided in the apparatus housing 10 and rapidly cooled in a molten state and drum means 2 which is configured to discharge the processed slag abrasive material SB ' 30, < / RTI >
The drum unit 30 includes a cylindrical drum 32 into which a slag bead SB and a wear material 2 are inserted and is rotatably provided in association with the rotating body 50, And a concavo-convex portion (34) formed on the inner surface to improve the abrasive property. A device housing (10); And slag beads SB which are rotatably provided in the apparatus housing 10 and rapidly cooled in a molten state and drum means 2 which is configured to discharge the processed slag abrasive material SB ' 30, < / RTI >
Further comprising ultrasonic applicator means (70) provided through the apparatus housing (10) and the drum means (30). A device housing (10); And slag beads SB which are rotatably provided in the apparatus housing 10 and rapidly cooled in a molten state and drum means 2 which is configured to discharge the processed slag abrasive material SB ' 30, < / RTI >
Wherein the abrasive material (2) is provided as a steel ball, and the discharged steel ball is recycled to the inlet side of the apparatus. 4. The method according to any one of claims 1 to 3,
The apparatus housing 10 includes a main body 12 to which the drum means 30 is rotatably seated; And
A cover part 14 detachably assembled on the main body part;
The slag abrasive product manufacturing apparatus according to claim 1, 5. The method of claim 4,
A rotating body (50) rotatably provided between the main body portion of the apparatus housing and the drum means and configured to apply a rotational force to the drum means;
Wherein the slag abrasive material comprises at least one material selected from the group consisting of iron and iron. 6. The method of claim 5,
The rotary body (50) includes a rotary shaft portion (54) through which the motor (52) is connected through the cover portion of the device housing; And
A rotating body 58 connected to the lower portion of the rotating shaft portion via a connecting portion 56 and assembled to the outside of the drum means 30 so as to be rotatable through a bearing element in the body portion of the apparatus housing;
The slag abrasive product manufacturing apparatus according to claim 1, The method according to claim 6,
Wherein the slag bead (SB) and the abrasive material (2) are introduced into the space between the connecting portions (56) before the processing into the drum means (30). The method according to claim 2 or 3,
The drum means 30 includes a cylindrical drum 32 into which slag beads SB and abrasive materials 2 are introduced and is rotatably provided in association with the rotating body 50,
Further comprising a concavo-convex portion (34) formed on an inner surface of the cylindrical drum to improve abrasive property. 5. The method of claim 4,
The cover and the bottom of the main body and the cylindrical drum of the drum unit are provided with an inlet and an outlet for discharging the slag beads and the abrasive material and discharging the processed slag abrasive material,
Wherein the discharge port of the cylindrical drum is aligned with the discharge port of the bottom through control of the motor. Treating the scaled steel plate with a scale breaker (330); And the slurry abrasive slurry processed by the slag bead are sprayed onto the surface of the hot-rolled steel strip which proceeds through the polishing slurry spraying unit 100 to remove the scale The method comprising the steps of:
The polishing slurry (102) comprises a slag abrasive (SB ') provided through the slag abrasive manufacturing system (1) described in any one of claims 1 to 3,
The polishing slurry may include high-pressure water supplied into the polishing slurry spraying unit; And a mixture obtained by mixing water and a slag abrasive or a mixture of slag abrasive and sprayed at a high pressure to remove the surface scale of the hot rolled steel strip. delete 11. The method of claim 10,
The pressure of the high-pressure water supplied to the polishing slurry spraying unit is 100 to 500 bar, and the polishing slurry 102 sprayed from the polishing slurry spraying unit and the treated scale are reprocessed to recycle the slag abrasive Of the hot rolled steel strip. 11. The method of claim 10,
Wherein the surface-scaled steel sheet is further subjected to a washing step and a drying step.

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