JPH10267762A - Method and apparatus for measuring temperature of molten metal - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a method and an apparatus for easily measuring and sampling the temperature of molten metal after injection refining. Kind Code: A1 In measuring and sampling a molten metal after powder injection refining, a lance insertion position into a molten metal bath surface during powder injection refining is stored, and a lance insertion position copying device is used. In this way, temperature measurement and sampling are performed by inserting a temperature measurement sampling probe into the same position as the lance insertion position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for measuring the temperature of a molten metal after powder blowing and refining using an injection lance.
The present invention relates to a method for easily performing a sampling operation and an apparatus used for performing the method.

[0002]

2. Description of the Related Art FIG. 1 shows an example of a conventional temperature measuring sampling device. As shown in this figure, molten metal, for example, the temperature of hot metal or steel in steel mills, or as a temperature measurement sampling device for measuring the chemical components,
A temperature-measuring sampling probe 5 is attached to a fixed post 3 erected on a working platform 2 via an elevating holder 4, and the probe 5 is immersed in hot metal in a mixed iron wheel 1 or in a steel bath. General. Of course, the post 3 and the elevating holder 4 that rotates and moves up and down also function to hold the injection lance 6. (See JP-A-54-128907)

[0003]

The above-mentioned temperature measuring sampling probe 5 is generally a consumable type using a cylindrical laminated cardboard, and is made of a steel holding pipe of about 20 to 50 mmφ. It is used by being attached to. Therefore, when the surface of the molten metal bath is a hard slag with a high basicity or is already covered with a solidified metal or the like, the probe 5 or the holding pipe often breaks during temperature measurement and sampling work, As a result, there was a risk that troubles such as a failure in sampling could occur.

An object of the present invention is to propose a method for easily measuring and sampling the temperature of a molten metal after injection refining. Another object of the present invention is to provide a temperature-measuring sampling device that is easy to handle for collecting a sample for measuring the temperature and chemical composition of a molten metal.

[0005]

Means for Solving the Problems As a result of diligent research for realizing the above-mentioned object, the inventors found that, for example, powder injection lance refining in hot metal pretreatment was carried out to solve the above-mentioned problems. After that, by detecting the insertion position of the powder injection lance into the hot metal bath surface in advance, the temperature measurement sampling device can be moved to the same position as the injection lance insertion position to perform temperature measurement and sampling. It is effective, and it has been found that the temperature measurement sampling process can be easily performed by such a method even when the hard high basicity slag covers the bath surface particularly after the hot metal pretreatment.

The present invention, which has been developed based on such knowledge, measures the temperature and sampling of the molten metal after powder injection refining, and stores the lance insertion position into the molten metal bath surface during powder injection refining. A temperature measurement and sampling method for a molten metal after powder injection refining, characterized in that temperature measurement and sampling are performed by inserting a temperature measurement sampling probe at the same position as the insertion position. In the present invention, it is preferable that the molten metal is hot metal, and the hot metal after powder injection refining is covered with high basicity slag.

Further, in the present invention, in carrying out the above-mentioned temperature measurement sampling method, a traversing carriage that moves in a direction perpendicular to the traveling direction is mounted on a lancer, and each of the traversing carriages is connected to the traversing cylinder via a cylinder. A pair of masts for raising and lowering the lance and for temperature measurement sampling are arranged in parallel, and each mast is provided with a lifting holder that holds and raises and lowers the lance and the sampling probe. A temperature-measuring sampling device characterized in that it is provided incidentally is used. In the present invention, the apparatus for locating a lance insertion position includes a powder injection lance insertion position detection unit for a molten metal bath surface, a storage unit for storing the lance insertion position detected by the detection unit, and a storage unit. It is preferable that the driving means comprises driving means for moving the traversing carriage toward the position stored in the storage device and moving the temperature measurement sampling probe up and down.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to powder injection processing of molten metal (hereinafter, described as an example of "hot metal"), that is, in hot metal pretreatment, for example, various types of hot metal bath surfaces in a mixed iron wheel 1 are used. The present invention proposes a method for removing the temperature of the hot metal and sampling for chemical composition measurement after removing the P and S treatments by inserting and blowing the powder into the injection lance, and an apparatus therefor. In particular, the feature of the present invention is that the insertion position of the injection lance is stored in advance, the temperature measurement sampling probe of the temperature measurement sampling device is moved to that position, and the probe is inserted at the same bath surface position, thereby enabling the bath to be inserted. An object of the present invention is to enable smooth insertion of a probe without being disturbed by high basicity slag generated on a surface.

In general, as a pretreatment operation of molten iron using the mixed iron wheel 1, a P removal agent and a S removal agent are blown into the molten iron using a powder injection lance for the purpose of removing P and S from the molten iron. There is a way. In this pretreatment, a large amount of slag is generated on the bath surface. For example, FIG. 2 shows the basicity (CaO / SiO ₂ ) of the slag generated during the hot metal pretreatment compared with that before the treatment. As is apparent from FIG. 2, the basicity before the pretreatment is 1.0 to 2.5, whereas the basicity after the treatment in which lime is blown at 18 to 20 kg / tp is 3.0 to 2.5.
5.0, which has changed to high basicity slag. Generally, when the basicity of the slag exceeds 4.0, it solidifies. Therefore, if such a hard slag covers the bath surface, if the temperature measurement and the hot metal sampling after the treatment are to be performed, the probe cannot be automatically inserted, and the slag layer is removed. It is necessary to cut and open a hole in advance with a jig. Of course, this work is a manual work performed by the operator, and therefore has a significant work load. if,
If the probe is pressed directly onto a hard slag having a high basicity without performing such a hole opening operation, there is a problem that the elevating holder and the like are damaged, and sometimes temperature measurement and sampling cannot be performed.

In order to eliminate the adverse effects of the above-mentioned hard slag layer covering the bath surface, in the present invention, when measuring the temperature of the molten metal after the powder injection refining, the lance to the molten metal bath surface during the powder injection refining is used. The insertion position is memorized, and the temperature measurement is performed by inserting the temperature measurement sampling probe at the same position as the insertion position.
We propose a sampling method. That is, if the probe is continuously inserted into the lance insertion position at the time of the powder injection refining, the probe will not be damaged, etc., and accurate temperature measurement and sampling will be possible.

According to the present invention, in order to realize such a temperature measurement sampling method, a traversing carriage that moves in a direction perpendicular to the traveling direction is mounted on the lancer,
A pair of masts for lances and temperature measurement sampling, each of which can be raised and lowered via a cylinder, are arranged in parallel to this traversing carriage, and each mast has a lifting holder that holds and raises and lowers the lance and sampling probe. And a temperature measuring sampling device provided with a lance insertion position locating device.

Conventionally, the lancer 7 merely carries the injection lance 5 and the sampling probe 5. In this regard, in the present invention,
A trolley 8 is mounted on the lancer 7, and an up-and-down cylinder 9 is mounted on the trolley 8, and a mast 10 which is raised by the operation of the cylinder 9 is fixed to the up-and-down cylinder 9. By raising and lowering the injection lance 6 (FIG. 3a) or the sampling probe 5 (FIG. 3b) with the lifting holder 4 attached to the mast 10, the lance 6 or the probe 7 can be selectively used. is there. Therefore, the apparatus of the present invention moves the lancer 7 forward,
In order to be able to move backward, to raise the mast 10 and to allow the lance 6 and the probe 5 to be inserted in the same position, the traversing carriage 8 is moved as shown in FIG.
Can be moved laterally.

The above-described insertion position locating apparatus particularly employed in the present invention is for accurately moving the sampling probe 5 to the insertion position HP of the injection lance 6. In other words, for temperature measurement and sampling,
The sampling probe 5 is configured to be guided to the injection insertion position HP by shifting a pair of masts 10a, 10b mounted in parallel on the traversing carriage 8, and to insert the powder injection lance into the molten metal bath surface. Position detecting means, storing means for storing the lance insertion position detected by the detecting means, and driving means for moving the traversing carriage toward the position stored in the storing means and moving the temperature measurement sampling probe up and down. It becomes.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to pretreatment of hot metal in a mixed iron vehicle will be described below. This embodiment is an example in which an injection lance 6 is inserted into hot metal in a torpedo-type mixed-iron car and the above-mentioned powder is blown into the target hot metal component as a de-P and S-removal process. Table 1 shows the components of the hot metal in this treatment, and Table 2 shows the amount of powder blown in the treatment. FIG. 2 shows the basicity of the slag on the hot metal bath before and after the treatment. In addition, about the method of this invention, the temperature measurement sampling apparatus shown in FIG. 3 was used, and as a comparative example, the thing using the apparatus shown in FIG. 1 was tested. In addition, regarding the operation of the temperature measuring sampling device, in the case of the present invention, the injection lance 6 and the sampling probe 5 may be inserted obliquely with respect to the hot metal bath surface. The elevation angle of the mast 10 by the cylinder 9 was previously detected and stored. Next, after injecting a set amount of powder from the injection lance 6,
(End of the preparatory treatment) Then, the lance 6 was raised to guide the mast to the horizontal position, thereby completing one cycle of operation. Further, in the example of the present invention, since the temperature measurement sampling probe is also mounted on the traversing carriage 7, the sampling probe 5 is moved to the same position as the injection lance insertion position by using the lance insertion position tracing device described above. The angle of elevation and the amount of elevating were controlled so as to be able to move. As a result, the insertion position of the injection lance 6 and the insertion position of the temperature measurement sampling probe 5 could be completely matched.

FIG. 4 shows a comparison between the conventional temperature measurement sampling apparatus and the frequency of manual operator intervention during temperature measurement and sampling in the method of the present invention. The vertical axis shows the value obtained by investigating the operator's manual intervention frequency with respect to the processing charge number of 100 charges in both the conventional method and the present invention method, and using the frequency in the conventional method as a parameter. As shown in the figure, the method according to the present invention has made it possible to carry out the temperature measurement sampling work after the pretreatment stably. FIG. 5 shows a comparison of the number of occurrences of a malfunction of the temperature measurement sampling device. In this figure, the vertical axis shows the value obtained by investigating the number of occurrences of defects per 100 charges of the processing charge in both the conventional method and the method of the present invention, and using the number of occurrences in the conventional method as a parameter. The faults indicate abnormalities of the overloading motor due to the high basicity slag after the pretreatment, replacement of the probe holder (bending), and the like. It has been found that the improvement of the quality can be achieved.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

As described above, according to the present invention, in the refining treatment by powder injection, for example, in the hot metal pretreatment, after performing the processing such as de-P and de-S, the temperature of the hot metal is measured and the component is determined. Since the probe for temperature measurement sampling can be inserted at the same position as the insertion position of the lance, even if there is a hard high basicity slag after the pretreatment on the bath surface, the probe can be easily inserted. This has made it unnecessary to insert a probe and cut the slag layer with the help of an operator. In addition, there was no problem of equipment such as deformation of the elevating holder for mounting the probe, and the life of the apparatus was improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a conventional temperature measurement sampling device.

FIG. 2 is a comparison graph of slag basicity before and after pretreatment.

FIG. 3 is a schematic diagram of a temperature measurement sampling device according to the present invention.

FIG. 4 is a comparative graph of automation of a temperature measurement sampling operation.

FIG. 5 is a comparison graph of the number of occurrences of equipment trouble in the temperature measurement sampling work.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mixed iron car 2 Platform 3 Fixed post 4 Lifting holder 5 Sampling probe 6 Injection lance 7 Lancer 9 Cylinder 8 Traversing trolley 10 Control mast

Claims (4)

[Claims] At the time of temperature measurement sampling of molten metal after powder injection refining, a lance insertion position into a molten metal bath surface during powder injection refining is stored, and temperature measurement sampling is performed at the same position as the insertion position. A method for measuring temperature and sampling of molten metal after powder injection refining, wherein the temperature is measured and sampled by inserting a probe. 2. The temperature measuring sampling method according to claim 1, wherein the molten metal is hot metal, and the hot metal after powder injection refining is covered with high basicity slag. 3. A traverse vehicle that moves in a direction orthogonal to the traveling direction is mounted on the lancer, and a pair of lances and temperature measurement sampling units each of which can be raised and lowered via a cylinder are mounted on the traverse vehicle. The temperature measurement sampling is characterized in that the masts are arranged in parallel, each mast is provided with an elevating holder that holds and raises and lowers the lance and the sampling probe, and is provided with a device that matches the lance insertion position. apparatus. 4. The apparatus for locating a lance insertion position, comprising: a powder injection lance insertion position detection unit for a molten metal bath surface; a storage unit for storing the lance insertion position detected by the detection unit; and a storage unit for storing the lance insertion position. 4. The temperature measuring sampling device according to claim 3, comprising driving means for moving the traversing carriage toward the set position and moving the temperature measuring sampling probe up and down.