KR100854373B1 - Acid cleaning solution sampling apparatus of the acid solution tank - Google Patents

Abstract

The present invention provides a hydrochloric acid sample collection device for picking a sample for picking a hydrochloric acid sample for checking foreign substances such as sludge remaining in the hydrochloric acid in the pickling bath of the electrical steel sheet. For that purpose,

The pickling device for pickling hydrochloric acid in the pickling tank includes: a fixed base 30 having a horizontal fixing roller 40 installed therein to rotate the sample collection container and flip it over; A motor 34 installed at the center of the fixed base 30; Horizontal rotating bars (34) attached to the shaft of the motor (34) and having floating touch bars (36, 36a) formed on upper portions of both ends thereof; A sampling cylinder (37, 37a) attached to both ends of the horizontal rotation bar (34) via a bearing; It characterized in that it comprises a controller 110 for controlling the rotation of the motor (34).

Electrical steel, scale, pickling bath, hydrochloric acid sample collection, hydrochloric acid sample collection device

Description

Acid cleaning solution sampling apparatus of the acid solution tank

1 is a schematic view showing an electrical steel plate pickling equipment,

Figure 2 is an exemplary view showing a conventional hydrochloric acid extraction operation in pickling equipment,

Figure 3 is a perspective view showing an example of a hydrochloric acid sample collection device in the pickling tank in the present invention,

4 is a cross-sectional view of the hydrochloric acid sample collection device in the present invention.

* Description of the symbols for the main parts of the drawings *

100: hydrochloric acid sample collection device

1. Hydrochloric acid tank 2. Large tank (hydrochloric acid storage tank) 3. Small tank (hydrochloric acid storage tank)

4. Drain port 5. Sampler 6. Strip 7. Support trolley 8. Spray nozzle

9. Supply pump 20. Filling line 30. Fixed base 31. Externally curved rail

32. Internal curved rail 33.33a.Bearing 34.Motor 35.Horizontal rotation bar

36.36a .. liquid touch bar 37.37a. Sample collection container 38. original return bar

39. Flip curve bar 40. Horizontal roller 41. Sample hydrochloric acid 50.50a.

60.60a .. support roller 101. hydrochloric acid solution reservoir

The present invention provides a pickling bath that can safely and quickly take a sample of hydrochloric acid in the process of pickling the surface subjected to pre-annealing and shot blaster treatment with hydrochloric acid to produce an electric steel sheet having a beautiful surface before cold rolling. It relates to a hydrochloric acid sample collection device.

The oriented electrical steel sheets mainly used in motors and transformers are steel sheets containing C: 0.046 ~ 0.058, Si: 3.0 ~ 3.3, Mn: 0.09 ~ 0.12, Cu: = 0.02 and Sol-Al: 0.027 as main components. In order to achieve high magnetic flux density and low iron loss, oriented electrical steel is subjected to annealing for 60 seconds at 900 ℃ crack through a heating zone with a maximum temperature of 1100 ℃ before cold rolling. During annealing, a dense scale layer is formed on the surface of the steel sheet while gradually cooling after winding to 580 ° C during hot rolling. The scale layer composed mainly of magnetite (Fe ₃ O ₄ ) and hematite (Fe ₂ O ₃ ) is reduced to Wustite (FeO) during high temperature annealing. After cooling slowly to 750 ℃ in the air cooling stage at the end of the annealing furnace, it is quenched to room temperature through water spray. Since the quenching takes place in a short time, most of the reduced Wustite (FeO) layer is not oxidized to room temperature, so the scale layer which is easy to pickling is formed, and this Wustite (FeO) layer is easily peeled off. Peeling occurs only by the difference in cooling rate between the steel sheet and the scale layer.

There are two ways to descale a scale layer advantageously past the annealing furnace into a state suitable for cold rolling. One method is to physically remove scale by spraying 0.6 mm shot ball accelerated by Turbine on the surface of steel sheet by mechanical method. At this time, the scale removal effect can be controlled by the operator while viewing the surface roughness and scale removal degree by controlling the rotation speed of the turbine and the shot amount of the shot ball.

Another method is to chemically remove 18% hydrochloric acid by reacting with fine residual scales that are not removed mechanically by feeding 18% hydrochloric acid to the pickling bath where it will react with the iron plate. 1 is a schematic view showing the electrical steel plate pickling equipment as described above.

Representative reaction occurring in the pickling process in the pickling equipment of Figure 1 is as follows.

FeO + 2HCl-> FeCl ₂ + H ₂ O ------- (1)

In this case, in order to obtain excellent magnetic properties, the grain-oriented electrical steel sheet contains about 3% of the Si component, which is the most effective alloy component for increasing the resistivity, and thus has the advantage of being able to produce a product having low iron loss and good magnetic properties. The Si component in the electrical steel sheet remains in the acid solution during chemical reaction between the hydrochloric acid and the oxide layer, which acts as a detrimental factor in generating sludge deposition in the pickling facility.

In more detail, some of the Si components in the electrical steel sheet are present as Fe ₂ SiO ₄ under the surface oxide layer (Fe ₂ O ₃ , Fe ₃ O ₄ , FeO). In the process of removing the oxide layer through the chemical reaction with hydrochloric acid as shown in the above (1), the Fe ₂ SiO ₄ layer located on the top of the iron is also reacted with hydrochloric acid. At this time, iron (Fe) reacts with hydrochloric acid to form iron chloride (FeCl _2, FeCl ₃ ), but the chemically stable SiO ₂ component does not react and remains in the hydrochloric acid solution.

The SiO ₂ component remaining in the hydrochloric acid solution has a particle size range of 0.3 to 100 μm and precipitates and solidifies in the circulation system as the hydrochloric acid solution is circulated over time, forming a sludge layer in the tank or piping. It will cause blockage. Especially when stopped due to periodic maintenance or equipment problems, the amount of settling is increased. Therefore, the sludge layer deposited in the circulation tank should be removed by periodic cleaning every two to three months to prevent clogging problems.

In the prior art, a certain amount of acid is circulated in a separate settling tank in a hydrochloric acid circulation system and settled in the settling tank, and then the operator discharges SiO ₂ deposits in the circulating tank every time. have.

In addition to the sedimentation method as described above, there are the following SiO ₂ removal methods.

In general, the SRP facility is widely used because SiO ₂ removal is required in the production of high-quality iron oxide in the common cold rolled acid recovery facility. However, the SRP plant uses neutralization with ammonia, so it is not applicable to pickling plants that require 18% hydrochloric acid. In addition, a centrifugal separation method using a centrifugal force and a method using a micro filter have been proposed.

That is, in the prior art, in order to prevent the above problems caused by the sludge formed in the pickling tank in advance, a certain amount of acid solution is circulated in a separate settling tank in a hydrochloric acid circulation system, and the settling tank is tanked. After settling in, the operator checks the SiO ₂ deposit (sludge) inside the circulation tank at regular intervals and discharges it. In this case, there is no way to check the state of SiO ₂ deposits in the circulation tank, so it is discharged every certain time depending on the operator's experience. Check the status of.

Figure 2 is an exemplary view showing the hydrochloric acid picking operation in the pickling facility by the operator in the prior art to check the state of the SiO ₂ deposits (sludge) in the circulation tank (tank) as described above.

That is, by discharging a certain amount of hydrochloric acid solution in the pickling tank, the operator directly collects and analyzes the hydrochloric acid solution using the sampler (5) and replaces the hydrochloric acid solution with the hydrochloric acid tank cleaning according to the analysis result. do.

Therefore, the hydrochloric acid sampling method of the prior art pickling tank may cause a safety problem for the operator by the high concentration of hydrochloric acid harmful to the human body remaining in the acid tank (Tank).

In addition, the sludge deposition state varies depending on the steel grade and line conditions, so depending on the operator's experience, if the time is too short, excessive sludge discharge will cause hydrochloric acid loss, and if the time is too long, it will settle. The sludge component is hardened to have a problem that it is difficult to discharge.

Such a conventional pickling of hydrochloric acid in the pickling tank is performed by an operator in a narrow space at the bottom of the hydrochloric acid tank (1), which makes the operation difficult and exposes the worker to hydrochloric acid fume. It has a problem that can seriously impair health.

Therefore, the present invention is to solve the above-mentioned problems of the prior art, the sample for sampling the hydrochloric acid solution for the inspection of foreign substances such as sludge (sludge) remaining in the hydrochloric acid solution in the pickling bath of the electrical steel sheet This ensures the safety of the workers and enables the rapid removal of the deterrent factors such as the clogging of the spray in the pickling bath due to the foreign substances remaining in the hydrochloric acid solution, thereby ensuring the pickling quality and the hydrochloric acid solution. It is an object of the present invention to provide a hydrochloric acid sampling device in a pickling tank that can reduce raw units.

Hydrochloric acid sample collection device in the pickling tank of the present invention for achieving the above object, the fixed base 30 is provided with a horizontal fixing roller 40 for turning the sample collection container to turn over; A motor 34 installed at the center of the fixed base 30; Horizontal rotating bars (35) attached to the shaft of the motor (34) and having floating touch bars (36, 36a) formed on upper portions of both ends thereof; A sampling cylinder (37, 37a) attached to both ends of the horizontal rotating bar (35) via a bearing; It characterized in that it comprises a controller 110 for controlling the rotation of the motor (34).

The fixed base 30 is characterized in that the internal curved rail 32 and the external curved rail 31 is formed to be recessed on the upper surface, respectively.

The sampling cylinders 37 and 37a have a flip curve bar 39 formed on a surface in contact with the horizontal fixing roller 40, and the flow touch bar on an opposite outer surface on which the flip curve bar 39 is formed. 36, 36a) is characterized in that the circular return bar 38 is formed to stop the rotation.

The horizontal rotating bar 35 has a pedestal 35a having a lower end at the lower end thereof which is inserted and coupled to be movable on the internal contact rail 32 of the fixed base 30 via bearings 33 and 33a. It is characterized by.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Figure 3 is a perspective view showing an example of a hydrochloric acid sample collection device in the pickling tank in the present invention, Figure 4 is a cross-sectional view of the hydrochloric acid sample collection device in the present invention.

As shown in Figure 3 and 4, the pickling device in the pickling solution of hydrochloric acid according to an embodiment of the present invention (hereinafter referred to as 'sample sampling device 100'), the upper center of the fixed base 30 The motor 34 is installed in the motor, and the horizontal rotating bar 35 is installed on the shaft of the motor 34 so as to be rotated on the fixed base 30, and the horizontal rotating bar 35 at both ends of the horizontal rotating bar 35. The sampling cylinders 37 and 37a are rotated around the axis, and the motor 34 is configured to rotate every time by the controller 110.

More specifically, as shown in FIGS. 3 and 4, in the fixed base 30, the internal curve rail 32 and the external curve rail 31 are processed to be recessed, respectively, and the internal curve rail. (32) The motor 34 is fixedly installed at the center part. The axis of the motor 34 is mounted with a horizontal rotating bar 35 which is fixed and rotated in the horizontal direction so as to be rotated forward and backward by the motor 34. In addition, the lower portion of the horizontal rotating bar 35 is supported by the pedestal 35a to the internal contact curve rail 32 of the fixed base 30 so as to maintain the horizontal, bearing (33.33a) at the bottom of the pedestal 35a Is inserted is configured to enable a smooth rotational motion.

On the other hand, at both ends of the horizontal rotary bar 35, the floating touch bar (36.36a) is formed integrally, the sample collecting cylinder (37.37a) at the lower portion of the floating touch bar (36, 36a) horizontal rotating bar (35) It is fastened vertically to the end of the bearing, the bearing 50.50a is inserted into the connection portion of the end of the horizontal rotation bar 35 and the sampling cylinder (37.37a), the sampling cylinder (37, 37a) is the horizontal rotation bar (35) ) Is installed to be rotated around the axis.

A curved flip curve bar 39 is welded to the front surface of the sampling container 37.37a, and a circular return bar 38 is fixedly welded to a surface 180 degrees from the plane on which the flip curve bar 39 is installed. And the lower end of the sampling container (37.37a) is seated in the external curve rail 31 by a support controller (60.60a).

Next, the horizontal fixed roller 40 is fixed to the upper portion of the hydrochloric acid solution storage 101, the height of the horizontal fixed roller 40 is located at a point tangential to the flip curve bar (39). Alternatively, the horizontal fixed roller 40 may be installed on the fixed base (30).

The motor 34 is rotated at a constant cycle by the control of a separate controller 110, the rotation period is set by the operator to the time for sampling.

Referring to the operation process of the present invention configured as described above are as follows.

18% hydrochloric acid was transferred to a hydrochloric acid circulation tank to remove the scale layer below 4.5μm after mechanical scale removal from the Shot Blaster after pre-annealing. Supply it. The acid is reacted in a pickling tank in a circulation tank and is combined with a low concentration of recovered acid containing a large amount of SiO ₂ to have a concentration of 8 to 15% for each tank.

At this time, a hydrochloric acid sample sampling device 100 for collecting a hydrochloric acid sample for measuring and removing SiO ₂ deposits generated while reacting is installed in the drain port 4 of the lower end of the hydrochloric acid tank 1 as shown in FIG. The sample is taken from the narrow space by being contained in the sampling containers 37 and 37a.

When hydrochloric acid is collected in the sampling containers 37 and 37a, the controller 110 rotates the motor 34 by 180 degrees. That is, when the motor 34 is rotated counterclockwise by the timer of the controller 110, the sampling container 37a located at the lower end of the drain port 4 is gradually rotated counterclockwise. Thereafter, the sampling container 37a is brought into contact with the horizontal fixing roller 40 by the flip curve bar 39 attached to the sampling container 37 and 37a at the instant of being positioned in the horizontal fixing roller 40. The hydrochloric acid sampled in the sampling vessels 37 and 37a is discharged to the hydrochloric acid solution storage tank 101 while the 37 and 37a are rotated and turned upside down.

Thereafter, when the circular return bar 38 of the sampling cylinders 37 and 37a contacts the floating touch bars 36 and 36a, the rotation of the sampling cylinders 37 and 37a is stopped, and the sampling cylinders 37 and 37a are stopped. ) Is reversed and returned to its original position. To this end, the sampling container (37.37a) having the above-described configuration is preferably made of a lower end portion than the upper end so as to be easily rotated to return to the original state after discharging the collected hydrochloric acid sample to the hydrochloric acid solution reservoir 101 .

As described above, the sampling vessels 37 and 37a in which the hydrochloric acid solution is emptied are momentarily positioned at the drain port 4 and the motor 34 is stopped to enter the counter for the next operation.

Thereafter, after the operator tests the hydrochloric acid sample collected in the hydrochloric acid solution reservoir 101, when the foreign matter generation amount exceeds the standard, the hydrochloric acid solution is exchanged.

The operator can quickly and safely by safely collecting the hydrochloric acid solution discharged through the drain port 4 of the pickling tank by the hydrochloric acid sample sampling device 100 of the present invention as described above and moving it into the hydrochloric acid solution reservoir 101. Hydrochloric acid solution measurement can be performed.

The above-described hydrochloric acid sample collection device in the pickling tank of the present invention performs safe operation by timely taking a hydrochloric acid sample and moving it into a hydrochloric acid solution storage container for storing the hydrochloric acid sample, and timely testing the state of the hydrochloric acid solution to perform appropriate measures. It is possible to prevent nozzle clogging due to hydrochloric acid contamination, thereby preventing the dropping of pickling quality due to poor supply of hydrochloric acid solution and preventing waste of hydrochloric acid solution.

In addition, the present invention described above improves the safety of hydrochloric acid measurement in the pickling bath by preventing the pickling of hydrochloric acid in the pickling tank by preventing the worker from harming the hydrochloric acid and the hydrochloric acid fume in the pickling bath. It provides an effect.

Claims (4)

A fixed base 30 provided with a horizontal fixing roller 40 for turning the sampling container to turn over; A motor 34 installed at the center of the fixed base 30; Horizontal rotating bars (35) attached to the shaft of the motor (34) and having floating touch bars (36, 36a) formed on upper portions of both ends thereof; A sampling cylinder (37, 37a) attached to both ends of the horizontal rotating bar (35) via a bearing; Hydrochloric acid sample collection device in the pickling tank, characterized in that it comprises a controller 110 for controlling the rotation of the motor (34). The hydrochloric acid sample collection device of claim 1, wherein the fixed base 30 is formed with an internal curve rail 32 and an external curve rail 31 recessed on an upper surface thereof. . The method according to any one of claims 1 to 4, wherein the sampling cylinder (37, 37a) is a flip curve bar 39 is formed on the surface in contact with the horizontal fixing roller 40, the flip curve bar 39 The hydrochloric acid sample collection device in a pickling tank, characterized in that the circular return bar (38) is formed on the opposite outer surface formed in contact with the flow touch bar (36, 36a) to stop the rotation. The pedestal of claim 3, wherein the horizontal rotating bar 35 has a lower end at a lower end thereof and is inserted and coupled to be movable on the internal contact rail 32 of the fixed base 30 via the bearings 33 and 33a. Pickling apparatus for hydrochloric acid in the pickling tank, characterized in that (35a) is formed.

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