KR20120037285A - Device for obtaining sample for measuring aluminum concentration in molten zinc pot - Google Patents

Abstract

PURPOSE: A sampling apparatus(100) for measuring an aluminum concentration in a plating bath is provided to closely examine a relation between an aluminum concentration in a plating bath and a planting performance through a sample in which an exact examination is possible. CONSTITUTION: A sampling apparatus(100) for measuring an aluminum concentration in a plating bath comprises a body(20), a crucible(30), a filter part(40), and a sample holder(50). The crucible is installed inside of the body. The crucible contains a sample collected from a plating bath. The filter part is connected to the lower part of the crucible. The filter filters dross from the sample. The sample holder is connected to the lower part of the filter part so that the sample passed through the filter part is collected.

Description

Sampling device for measuring aluminum concentration in plating bath {DEVICE FOR OBTAINING SAMPLE FOR MEASURING ALUMINUM CONCENTRATION IN MOLTEN ZINC POT}

The present invention relates to an apparatus for extracting a sample for measuring the aluminum concentration in the plating bath. More particularly, the present invention relates to a sample extraction device that enables the extraction of a sample by removing the dross to enable more accurate aluminum concentration measurement.

In general, when the steel sheet is passed through the molten zinc contained in the plating bath in the hot dip galvanizing process, fine iron adhering to the surface of the steel sheet reacts with the aluminum in the plating bath to interface between the surface of the steel sheet and the molten zinc within seconds. An inhibition layer is formed. The resulting interfacial inhibiting layer ruptures through galvanizing, and the zinc-iron alloying degree is determined according to the thickness of the suppressing layer.

In such a plating process, excess iron that does not react with aluminum in the plating bath reacts with molten zinc to form a compound that is heavier than molten zinc and precipitates at the bottom of the plating bath or floats in the plating bath. The intermetallic compound composed of zinc-iron-aluminum precipitated or suspended in the plating bath is called dross.

It is very important to control the concentration of aluminum dissolved in the plating bath to an appropriate level so as to control the chemical composition and the amount of dross formed in the plating bath to ensure excellent surface quality of the galvanized steel sheet. Therefore, it is necessary to accurately grasp the aluminum concentration in the galvanizing bath, and conventionally, a phenomenon in which a dross in the plating bath is included in the sample at the time of sampling for measuring the aluminum component in the plating bath. Therefore, the wet analysis of the sampled sample results in a higher value than the actual aluminum concentration dissolved in the plating bath by the dross. Therefore, there is a problem in that it is not possible to accurately measure the aluminum concentration in the plating bath directly participating in the reaction with the steel sheet through the sample collected by the conventional method.

Thus, by filtering the dross in the sample extracted for the aluminum concentration measurement, to provide a sample extraction device for measuring the aluminum concentration in the plating bath to obtain a sample capable of more accurate measurement.

To this end, the apparatus includes a main body, a crucible installed inside the main body and containing a sample taken from the plating bath, and a filter part connected to the bottom of the crucible to filter out dross from the sample and a filter part connected to the bottom of the filter part. It may include a sample holder for collecting a rough sample.

The apparatus further includes a heating section for heating the sample flowing into the filter section to the melting temperature.

The heating unit may further include a heating unit for heating the sample to the melting temperature.

The apparatus may further include a cover installed at the top of the main body to open and close the crucible, and a clamping part for fixing the cover.

The apparatus may further include a pressurizing unit connected to the crucible for relatively increasing the pressure of the crucible side based on the filter unit.

The filter unit may include a housing installed at the bottom of the crucible and communicating with the bottom of the crucible, and a filter member installed at the housing to filter the dross from the sample.

The filter member may be made of a ceramic material including fine pores.

Fine pores of the filter member may be formed in a size of 16 ~ 40㎛.

The filter member may be formed of any one or more ceramic powders selected from alumina (aluminum oxide), silica (silicate anhydride), silicon carbide, and zirconia (zirconium oxide).

The crucible may be made of graphite material.

According to the present apparatus as described above, it is possible to obtain a sample containing only effective aluminum that participates in the reaction with the actual steel sheet by removing the dross, so that a more accurate aluminum concentration measurement is possible.

In addition, it is possible to clearly clarify the relationship between the aluminum concentration in the plating and the plating properties through a sample capable of more accurate measurement.

1 is a schematic cross-sectional view of a sample extraction device for measuring the aluminum concentration in the plating bath according to the present embodiment.
2 is a perspective view showing the internal configuration of a sample extraction device for measuring the aluminum concentration in the plating bath according to the present embodiment.
3 is a perspective view illustrating a filter unit and a sample holder configuration of the sample extraction apparatus for measuring the aluminum concentration in the plating bath according to the present embodiment.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As can be easily understood by those skilled in the art, the following embodiments may be modified in various forms without departing from the spirit and scope of the present invention and the embodiments described herein. It is not limited to the example.

The drawings are schematic and illustrate that they are not drawn to scale. The relative dimensions and ratios of the parts in the figures have been exaggerated or reduced in size for clarity and convenience in the figures and any dimensions are merely exemplary and not limiting.

1 and 2 show a sample extraction device and its internal configuration according to the present embodiment.

As shown in the drawing, the apparatus 100 includes a main body 20 installed on the frame structure 10, a crucible 30 installed inside the main body 20 and containing a sample collected in a plating bath, and A filter holder 40 connected to the bottom of the crucible 30 to filter the dross from the sample, and a sample holder 50 connected to the bottom of the filter part 40 to collect the sample that has passed through the filter part 40. Include.

The main body 20 is a cylindrical structure, and supports the internal configuration and forms the appearance of the device. The crucible 30, the filter unit 40, and the sample holder 50 are provided inside the main body 20. The cover 22 is installed on the upper end of the main body 20 to open and close, and opens and closes the open upper end of the crucible 30 installed in the main body 20. When the cover 22 is closed on the top of the main body 20, the crucible 30 installed in the main body 20 is sealed from the outside. An sealing O-ring 24 is installed between the upper end of the crucible 30 and the cover 22 to maintain airtightness. In addition, a clamping part 26 for fixing or releasing the cover 22 on the main body 20 is installed at an upper end of the main body 20. The clamping part 26 includes a fixing member 27 rotatably coupled to the upper end of the main body to press the cover 22 and a handle 28 installed on the fixing member to rotate the fixing member.

When the clamping part 26 fixes the cover 22 to the top of the main body 20, the cover 22 blocks the top of the crucible 30.

The crucible 30 is installed on the upper inside of the main body 20. The filter unit 40 and the sample holder 50 are disposed at the lower end of the crucible 30. The sample contained in the crucible 30 flows to the lower end of the crucible 30, passes through the filter part 40, and is collected in the sample holder 50.

In the present embodiment, the crucible 30 may be made of a graphite (graphite) material that does not adhere to the surface of the sample when the molten zinc is solidified. The material of the crucible 30 is not limited to graphite and may be made of various materials.

Here, according to the present embodiment, the filter unit 40 further includes a heating unit for heating the sample flowing down the filter member 43 to the melting temperature.

The heating unit may include a heating member 29 installed in the enclosure 41 to surround the crucible 30. The heating member 29 has a cylinder shape and extends below the crucible to surround the crucible, the filter part and the sample holder. The heating member is not particularly limited as long as the heating member may have a structure provided in the form of a coil, and may heat the interior thereof.

The heating member 29 maintains the sample at the same temperature as the plating bath. That is, the heating member 29 heats the lower end of the crucible 30 from which the sample or the sample is discharged so that the sample maintains the temperature of 450 to 470 ° C, and the molten zinc, which is the sample passing through the filter member 43, is solidified. Will be prevented.

As shown in FIG. 3, the filter part 40 is located at the bottom of the crucible 30 and communicates with the bottom of the crucible 30, and the filter holder 42 inserted into the enclosure 41. The filter holder 43 is inserted into the center of the filter holder to filter the dross from the sample. On the upper end of the enclosure 41, an o-ring 44 is installed on the contact surface with the lower end of the crucible 30 for airtightness. An opening 46 is formed in the lower portion of the housing 41 to allow the sample holder 50 to be charged or withdrawn. Accordingly, the sample holder 50 may be positioned below the filter holder 42 or the sample holder may be drawn out through the opening 46. The housing 41 includes a filter unit 40 and a sample holder 50 and is detachably coupled through an open lower end of the main body 20, which will be described later.

In the present embodiment, the filter member 43 may be installed in the glass tube 47. The tube 47 prevents the molten zinc from escaping through the side without passing through the peter member 43. The filter member 43 has a porous structure having fine pores. The filter member 43 filters the dross through the fine pores and passes only the molten zinc. To this end, the filter member 43 is manufactured to withstand sufficiently at the melting point (460 ℃) of the molten zinc. In addition, the fine pores may be formed in the range of 16㎛ ~ 40㎛. When the size of the micropores is 16 μm or less, the size of the pores is so small that the processing speed of the sample is so slow that workability is deteriorated. If the size of the fine pores exceeds 40㎛ dross may exit the filter unit 40.

In the present embodiment, the filter unit 40 may be formed of any one or more ceramic powders selected from alumina (aluminum oxide), silica (silicate anhydride), silicon carbide, and zirconia (zirconium oxide). The filter unit 40 is not limited to the ceramic and may be applied to any material that does not chemically react with molten zinc and aluminum.

The sample holder 50 is positioned below the opening 46 of the housing 41 and connected to the bottom of the filter holder 42 in which the filter member 43 is installed. That is, the discharge hole 45 is formed in the bottom surface of the filter holder 42 coupled to the housing 41 so that the sample passed through the filter member 43 can flow out. In addition, the sample holder 50 has an open top, and forms a storage space therein so that the sample that has passed through the filter unit 40 is stored therein.

The enclosure 41 is inserted into the main body 20 through the lower end of the main body 20, coupled to the main body 20, and communicated with the lower end of the crucible 30. And, if necessary, by moving to the outside of the main body 20 it is possible to take out the sample for measuring the aluminum concentration collected in the sample holder 50 via the filter member 43.

To this end, a lower portion of the frame structure 10 on which the main body 20 is installed is provided with a support 60 on which the enclosure 41 is placed, and a lifting mechanism 62 for lifting up and down the support.

Therefore, when the lifting mechanism 62 is lifted and operated, the support 60 is raised to load the enclosure 41 placed on the support into the main body 20 through the open lower end of the main body 20. When the enclosure 41 is fully charged into the main body 20, the upper end of the enclosure 41 is in close contact with the bottom of the crucible 30 through the O-ring 44 to maintain hermeticity. When the lifting mechanism 62 is lowered, the support 60 is lowered and the housing 41 placed on the support is separated from the main body 20. Accordingly, the sample collected in the sample holder 50 can be collected.

As shown in the drawing, the elevating mechanism 62 may have a structure in which a plurality of bars are connected to each other by linkage and stretched by a driving cylinder, and are not particularly limited.

Here, the apparatus further includes a pressurizing unit for relatively increasing the pressure on the crucible 30 side based on the filter unit 40.

Accordingly, the pressure on the crucible 30 side is high and the pressure on the sample holder 50 side is lowered relative to the filter part 40 so that the sample in the crucible 30 can pass smoothly through the filter part 40. do.

The pressurization portion is formed in the cover 22, the supply hole 72 is communicated to the open upper end of the crucible 30, and the air supply unit (not shown) connected to the supply hole to supply the pressurized air to the crucible 30 ) May be included.

Hereinafter, the operation of the apparatus will be described.

By filtering the sample in the plating bath through this apparatus, it is possible to remove dross present in the sample and obtain a plating bath sample for concentration measurement without dross.

The sample solution in the plating bath is charged into the crucible 30, and the lid 22 is closed to seal the inside. The sample contained in the crucible 30 is filtered while passing through the filter member 43 through the bottom of the crucible 30. Here, the pressure is increased by supplying air by driving the pressurization unit toward the crucible 30 based on the filter member 43. The negative pressure is applied to the sample holder 50. The sample contained in the crucible 30 is passed through the filter member 43 by the pressure variation of the front and rear ends of the filter member 43. In addition, the heating member 29 installed in the housing 41 is operated in the above process to heat the sample flowing down to the filter member 43. This makes it possible to prevent the molten zinc in the sample from solidifying.

As the sample passes through the filter member 43, the dross included in the sample is filtered out. The sample that has passed through the filter member 43 is collected in the sample holder 50 positioned below the filter member 43.

As such, when the sample filtered by the sample holder 50 and the dross is removed is collected, the housing 41 may be separated from the main body 20, and the sample collected in the sample holder 50 may be taken out and used as a sample for concentration measurement. .

The sample collected from the sample holder 50 can be accurately measured how much the concentration of dissolved effective aluminum reacted with the actual steel sheet through the dross is removed. Through this, it is possible to indirectly predict the thickness of the suppression layer generated by the reaction between the steel sheet and the effective aluminum, thereby predicting a change in the degree of alloying of zinc and iron and plating properties. In addition, it is possible to predict the amount of dross in the plating bath by comparing the aluminum and iron concentrations of the filtered sample and the unfiltered conventional sample.

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

10: frame structure 20: main body
22: cover 29: heating member
30: crucible 40: filter part
41: enclosure 42: filter holder
43: filter member 45: discharge hole
46: opening 50: sample holder
60: support 62: lifting mechanism
72: opening hole

Claims (9)

The crucible is installed inside the main body and the sample collected from the plating bath, the filter unit is connected to the bottom of the crucible to filter the dross from the sample, the sample is connected to the bottom of the filter unit Sample collection device for measuring the aluminum concentration in the plating bath comprising a sample holder collected. The method of claim 1,
The filter unit is installed at the bottom of the crucible and the sample communicating with the bottom of the crucible, the filter holder installed on the housing, the filter holder is installed in the filter holder for filtering the dross from the sample sample extraction for the aluminum concentration in the plating bath Device. The method of claim 2,
The filter unit further comprises a heating unit for heating the sample to the melting temperature, the heating unit is a sample extraction device for measuring the aluminum concentration in the plating bath comprising a heating member installed in the enclosure surrounding the crucible. The method of claim 2,
The enclosure is detachably coupled to a lower portion of the main body, and a support on which the enclosure is placed is provided at a lower portion of the frame structure for supporting the main body, and a lifting mechanism for lifting and lowering the support to attach and detach the enclosure to the main body is provided. A sample extraction device for measuring aluminum concentration in a plating bath adapted to be separated from the process. The method of claim 2,
The filter member is a sample extraction device for measuring the aluminum concentration in the plating bath is a ceramic material formed with fine pores. The method of claim 5, wherein
The filter member is a sample extraction device for measuring the aluminum concentration in the plating bath formed of any one or more ceramic powder selected from alumina, silica, silicon carbide, zirconia. The method of claim 5, wherein
The micro-pores sample extraction apparatus for measuring the aluminum concentration in the plating bath is formed in a size of 16㎛ ~ 40㎛. The method of claim 1,
The crucible is a sample extraction device for measuring the aluminum concentration in the plating bath made of graphite. The method according to any one of claims 1 to 8,
Sampling for measuring the aluminum concentration in the plating bath further comprises a pressurizing portion for supplying air through the supply hole is formed in the cover and communicated to the open top of the crucible, relative to the filter portion relative to the pressure of the crucible Device.

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