KR20040021017A - Sampler for analyzing slag component - Google Patents

Abstract

PURPOSE: A sampler for analyzing slag components is provided to effectively take out only pure slags and to reduce analyzing time for the slags by performing analyzing work without a pre-treatment process. CONSTITUTION: A sampler(10) includes a pipe(20) and a shell mold(30) coupled with a lower end of the pipe(20). An outer peripheral portion of the shell mold(30) is supported by a ceramic fiber(50). The shell mold(30) mainly includes sand and supports a sample housing(40) having a sample chamber. The ceramic fiber(50) is fixed to a lower end of the pipe(20) so as to support an outer peripheral portion of the shell mold(30). The ceramic fiber(50) surrounds an outer wall of the sampler(10) so that a slag layer is stably maintained when sampling a slag. A curved opening section(70) is formed at a lower end of the shell mold(30).

Description

Sampler for slag component analysis {SAMPLER FOR ANALYZING SLAG COMPONENT}

The present invention relates to a slag sampling sampler for collecting the slag generated during the refining process during the steelmaking process of the metal and to analyze the composition thereof, more specifically, pure and pure slag without the mixing of molten steel and impurities to analyze quickly and accurately The present invention relates to a sampler for slag component analysis, which makes it possible to control and control the refining process more efficiently.

In order to collect the slag sample generated during the refining process, a collecting device such as a spoon or a pipe was conventionally deposited on the slag layer which floated to the upper part of the molten steel during refining, and a part of the slag was collected. As shown in FIG. 1, the slag sample is sent to the analysis chamber, and in the analysis chamber, the slag sample is pulverized into a powder state by using a ball mill to remove impurities contained in the sample, and then pure slag is removed through magnetic iron removal using magnetic force. After collecting the bay and melting it at a high temperature of more than 1500 ℃ or press molding using a press, after the specimen manufacturing process and analyzed the slag component through the X-RAY analyzer.

Therefore, the sampling of slag generated during the refining process during the steelmaking process is complicated by the pretreatment process for the analysis, and thus it takes too much time to analyze (about 20-30 minutes) and uses the analysis information to perform the refining process. The rapid deterioration in control has led to difficulties in quality control of steel products.

In addition, since the slag sample is immersed in the slag layer when the slag sample is collected, the slag sample is pumped up, and thus the sample is collected in a state in which molten steel or impurities are mixed together and transferred to the analysis chamber. It was a factor that increases the component error due to the sampling has a disadvantage in reducing the accuracy of the analysis.

The present invention has been made in view of the above-described problems of the prior art, and solves this problem. Thus, the molten steel and impurities are not mixed in the refining process during the steelmaking process, so that only pure slag can be efficiently sampled. The aim is to provide a sampler for slag component analysis, which can be analyzed immediately without a pretreatment process, and the analysis time can be shortened and the accuracy of the analysis can be reduced by reducing the error range of the component.

1 is a flow chart showing a conventional slag sample analysis method,

2 is a cross-sectional view showing an example of a sampler according to the present invention;

3 is a cross-sectional view showing another example of a sampler according to the present invention;

4 is a cross-sectional view showing another example of a sampler according to the present invention;

5 is a cross-sectional view showing a possible example of a sample housing constituting the sampler according to the present invention;

Figure 6 is a use state of the sampler according to the present invention.

Explanation of symbols on the main parts of the drawings

10 .... Sample 20 ....

30 .... Shell Mold 40,40 ', 40 ".... Sample Housing

42,42 ', 42 ".... takeout 44 .... notch

50 .... ceramic fiber 60 .... release agent

70,70 '.... opening

The above object of the present invention and the shell mold is inserted into the lower end of the branch pipe immersed in the slag layer of the ladle; A ceramic fiber which is fixed to an outer circumferential surface of the bottom of the branch pipe and a part thereof is disposed to support and fix the outer circumferential surface of the shell mold; An opening having a lower end surface of the shell mold curved in an upward direction; It is achieved by providing a sampler for slag component analysis comprising a cylindrical sample housing having a sampling port and a sample chamber in communication with the apex of the opening and fixed inside the shell mold.

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

2 is a cross-sectional view of the main portion showing one possible embodiment of a sampler according to the present invention.

According to Figure 2, the sampler 10 according to the present invention is provided with a paper tube 20 made in the form of a tube by compressing the paper, the shell mold 30 is inserted into the lower end of the paper tube 20, the shell mold The outer circumferential surface of 30 is supported by the ceramic fiber 50.

The shell mold 30 is formed with sand as a main component, and is a mold for fixing a sample housing 40 having a sample chamber R, which will be described later, in which a slag sample to be collected is filled, and the ceramic fiber 50 is the branch pipe ( It is fixed to the outer peripheral surface of the shell mold 30 while being fixed to the outer peripheral surface of the lower end of 20).

In particular, the ceramic fiber 50 covers the outer wall of the sampler 10 to prevent the flow of the slag layer due to the splash of molten steel (SPLASH) during the slag sampling to enable a more healthy slag sampling.

The bottom surface of the shell mold 30 has a conical shape, e.g., a cone shape or a hemispherical shape, with a hollow shape on the bottom surface of the shell mold 30 and curved toward the top of the branch pipe 20. Is formed.

In addition, the sample housing 40 is fixed to the center of the lower surface of the shell mold (30).

The sample housing 40 has an empty sample chamber (R) inside and is formed in a shape in which the front surface is closed, the longitudinal direction of which is disposed in a transverse direction, and the sampling port is located in the longitudinal center portion of the outer peripheral surface thereof. 42 is perforated.

Particularly, the sample housing 40 has a thickness of 1 mm, an outer diameter of 25 to 35 mm, and a height of 5 to 8 mm, and an analysis surface of both side portions of the sample housing 40 is formed of a plate and the thickness of the slag is 2 mm. The uniform solidification proceeds at the time of inflow, and their materials are made of general steel or stainless steel, so that they do not melt or deform even at high temperature of 1400 ~ 1600 ℃, and they have excellent thermal conductivity and corrosion resistance. It is desirable to allow the sample to be collected.

The collecting port 42 is disposed so as to be in communication with the apex of the opening 70, the molten slag to be collected is introduced smoothly, and is formed to have a diameter of 3 ~ 6mm to minimize the outflow of the introduced slag desirable.

In addition, since the slag contained in the ladle during the refining process has a thin thickness of about 70 ~ 100mm, it is very difficult to collect pure slag free of impurities, so that the volume of the opening 70 and the sample chamber R is possible. It is particularly preferable to zoom so that the ratio is maintained at 5: 1 or more so that the slag collected in the opening 70 is easily introduced into the sample chamber R by the action of the iron positive pressure.

In addition, a release agent 60 is applied to an inner wall surface of the opening 70, that is, a lower surface of the shell mold 30 in which slag is collected.

The release agent 60 is for slag to contact the shell mold 30 to erode the shell mold 30 or to suppress the gas generated by the reaction between the shell mold 30 and the slag, for this purpose The release agent 60 is preferably made into a liquid material (particularly a hole coat or an alpha coat) containing a refractory material and a binder.

3 and 4 show another possible embodiment of a sampler according to the invention.

According to Figs. 3 and 4, the sampler according to the embodiment of the present invention is substantially the same as in the embodiment described in Fig. 2 above, but only in the excretion direction thereof.

The difference in the excretion direction is in the formation position difference of the collecting ports 42 'and 42 ", which will be described with reference to FIG.

In addition, the openings 70 and 70 'provided below the sample chambers 40' and 40 "have a hemispherical shape or a cone shape as shown in FIG.

According to (a) and (b) of FIG. 4, the two longitudinal cross-sections of the sample housings 40 and 40 'have a plurality of notches 8 in a circumferential direction, preferably 45 ° apart from the center thereof. NOTCH) 44 is formed.

The notch 44 has a protrusion (not shown) in which a central portion of the length protrudes inward so that gas introduced into the sample chamber R can be easily discharged to the outside of the sample housings 40 and 40 '. At this time, since a part of the diameter of the notch 44 is narrowly formed when gas is discharged by the pressure inside the sample chamber R, the discharge of the slag sample under pressure at a time is suppressed and the degree of freedom is higher than that of the slag sample. Only remarkably large gases are easily vented.

As a result, a rapid inflow of slag sample is induced, and at the same time, uniform coagulation is performed so that there is no component deviation of the analytical surface.

However, in the case of (a), the sampling port 42 is formed in the center portion in the longitudinal direction of a part of the outer circumferential surface of the sample housing 40, and in the case of (b), the sample housing 40 'having the notch 44 formed therein. It is formed so as not to interfere with the notch 44 in the central portion of one side surface.

The present invention made up of such a configuration has the following operational relationship.

Referring to FIG. 5 and the aforementioned drawings, first, when the molten steel received in the ladle L by the vacuum bath V is refined, the slag layer due to the injured slag on the upper side of the ladle L, that is, the upper side of the molten steel. Will be formed.

At this time, the worker is lifted out after immersing the sampler 10 in the slag layer for 5 to 10 seconds in the collecting table (P) installed in the adjacent position of the ladle (L).

Since the sampler 10 has the above-described structure, it is possible to collect slag samples of sound good quality (almost no impurities are introduced) with only one immersion operation.

That is, the slag distributed in the slag layer is introduced into the opening 70 formed at the lower end of the sampler 10 as the sampler 10 is immersed, and the inside of the opening 70 is formed by the repulsive force by the pressure of the sampler 10. Only the pure slag sample is introduced into the sample chamber R through the sampling holes 42 and 42 ′ in which a portion of the slag collected in communication with the opening 70 is connected.

At this time, the collected air of the sample chamber (R) is quickly discharged through the notches 44 installed on both sides of the sample housing (40, 40'40 "), so that the slag inflow process occurs easily.

In the analysis method, when the sample chamber R is filled with the slag sample after a predetermined time, the operator takes out the sampler 10 and sends the sampler 10 to the analysis chamber through the tube, and the sample is immediately X-RAY. Analytical work is done through the analyzer.

In other words, since the slag sample introduced into the sample chamber R is a pure analyte slag sample with almost no impurities, the separate impurities removal process and the test piece manufacturing process are not required as before, and thus the analysis work can be performed immediately. Will be.

(Test example)

Hereinafter, the test example of this invention is demonstrated.

Table 1 shows the results of analyzing the slag sample collected by using the sampler according to the present invention and the result of analyzing the slag by using a pipe of a conventional method and performing pretreatment processes such as removing impurities and preparing test specimens.

In general, the slag component analysis value is known to be reliable when the TOTAL analysis of the element is 95% or more.

division T-Fe SiO ₂ CaO Al ₂ O ₃ MgO MnO P ₂ O ₅ TOTAL Remarks Conventional Law 1.61 6.40 47.57 30.85 6.52 2.61 0.04 96.15 Inventive Example One 1.84 2.78 40.91 45.49 6.02 2.64 0.25 99.81 2 1.66 2.64 41.48 45.18 5.73 2.47 0.25 99.75

As shown in Table 1, both the conventional method and the inventive example showed a high TOTAL analysis value of 95% or more.

In particular, in the conventional method, the TOTAL value was found to be 96.15%, while the invention examples 1 and 2 showed high analysis values of 99.81% and 99.75%.

Therefore, in the analysis of the composition of slag, it is possible to obtain the slag sample easily, and to obtain the accurate analysis value while the component analysis is faster than the conventional method.

As described in detail above, the present invention provides the following effects.

First, the use of a sampler facilitates the collection of slag samples.

Secondly, the incorporation of impurities is suppressed as much as possible, so that pure high quality slag sampling can be performed quickly.

Third, the pure slag sample can be collected, and thus, it is possible to shorten the analysis time of the slag component, which required at least 20 minutes or more, to 5 minutes or less, since the pretreatment process such as removal of impurities for analysis and preparation of test pieces is not necessary.

Claims (3)

A shell mold 30 inserted into a lower end of the branch pipe 10 immersed in the slag layer of the ladle L; A ceramic fiber (50) fixed to an outer circumferential surface of the lower end of the branch pipe (10), the portion of which is disposed to support and fix the outer circumferential surface of the shell mold (30); An opening (70, 70 ') having a lower end surface of the shell mold (30) curved in an upward direction; Cylindrical sample housings 40 and 40 having sampling openings 42, 42 ′ and 42 ″ and sample chambers R communicating with the vertices of the openings 70 and 70 ′ and fixed inside the shell mold 30. A sampler for slag component analysis, characterized in that comprising a). The method of claim 1, The opening (70, 70 ') is formed in a hemispherical or conical shape, the inner wall surface of the slag component analysis sampler, characterized in that the release agent 60, which is a liquid material containing a refractory material and a binder. The method of claim 1, The sample housings (40, 40 ', 40 ") is a high melting point metal, excellent thermal conductivity and excellent corrosion resistance of ordinary steel or stainless steel, characterized in that a plurality of notches 44 are formed in the circumferential direction on both sides thereof. Sampler for slag component analysis.