JPS642175B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a temperature detection device for detecting the temperature of a solution in a converter from the tuyere of a converter for copper smelting.

``Prior art'' Copper smelting usually involves a melting process in which the raw copper concentrate is melted in a melting furnace and separated into sludge and sludge, and the sludge produced in this melting process is guided into a converter. A copper manufacturing process in which silicate ore is added to the coating and air is blown into it to oxidize the coating to produce blister copper, and the blister copper produced in this copper fabrication process is refined in a refining furnace to improve its quality, and then anode is applied. A refining step in which the anode is cast and an electrolytic refining step in which the anode produced in this refining step is electrolytically refined are sequentially performed.

By the way, as a melting furnace for the melting process, a reverberatory furnace has been used for a long time because it can process a wide range of types and grades of ore and is relatively easy to operate.

However, reverberatory furnaces have the disadvantage of requiring a large amount of fuel and increasing fuel costs.

In addition, the exhaust gas from the furnace is subjected to a prescribed exhaust gas treatment to desulfurize it to prevent pollution. In that case, exhaust gas with a high SO ₂ concentration is led to a sulfuric acid plant and treated as concentrated sulfuric acid, and exhaust gas with a low SO ₂ concentration is led to a gypsum plant and treated as gypsum. Generally, however, gypsum plants are not equipped with This results in a huge amount of gas, and the exhaust gas treatment costs become expensive. Therefore, it is undesirable that a large amount of exhaust gas with a low SO ₂ concentration is formed.

However, in the reverberatory furnace, a large amount of combustion gas is generated to burn a large amount of fuel, and the gas generated by melting ore is diluted by this large amount of combustion gas, so that the exhaust gas of the furnace is Inside SO ₂
The concentration becomes very low. Therefore, the exhaust gas from the reverberatory furnace must be treated at a gypsum plant, and increasing the amount dissolved in the reverberatory furnace is disadvantageous in terms of exhaust gas treatment costs.

Therefore, in order to reduce fuel costs and exhaust gas treatment costs, the applicant first decided to melt part of the concentrate that should be melted in the reverberatory furnace in the converter of the copper manufacturing process. A technique was proposed.

This technique will be explained using FIGS. 5 and 6.

FIG. 5 shows a conventional conventional converter, and FIG. 6 shows a conventional example of a converter that has been improved in order to put the above-mentioned technology into practical use.

As understood from Figure 5, a normal converter is
A large number of tuyeres 2 (approximately 50 locations) are fixedly installed on the side of the furnace body 1 at predetermined intervals.

The tuyeres 2 are for blowing air into the solution in the furnace body 1 to oxidize the solution.
and a joint part 4 connected to the outer end of the main body 3 (the end protruding outside the furnace main body 1, the right end in the figure). It is composed of.

The joint part 4 branches the passage 3a provided by the main body part 3 into two branch passages 4a and 4b. And the two branch passages 4
One of the branch passages 4a and 4b is for feeding air, and an air pipe 5 is connected to the end thereof. The other branch passage 4b is used to remove the solution that has adhered to and solidified on the inner end or inner peripheral surface of the main body 3 by inserting a punching rod (not shown) into the main body 3. It is formed as if it were a straight extension of the end of the passage 3a, and when the punching rod is pulled out, a ball 6 is inserted into the valve seat 7 as shown by the two-dot chain line in the figure. A valve mechanism 8 is provided which automatically closes the passage by falling down.

As is clear from FIG. 6, the improved converter is one that has been modified so that the concentrate can be fed into the furnace from the tuyere, that is, the joint part 4 that forms part of the tuyere 2.
At the same time, a branch passage 9 is formed for feeding new concentrate into the branch passage 9, and a concentrate transport pipe 10 is joined to the end of the branch passage 9, so that the concentrate is transferred to the vicinity of the joint between the main body part 3 and the joint part 4. is supplied, and this concentrate is sent into the furnace body 1 by air pressure sent through the blast pipe 5.

In the converter shown in FIG. 6, the concentrate fed through the branch passage 9 is naturally melted by the heat of the solution in the furnace without being particularly heated using a burner or the like. Therefore, the amount to be melted in the reverberatory furnace can be reduced by the amount melted in the converter, and the amount of fuel used in the reverberatory furnace can be saved accordingly.

Furthermore, since only a very small amount of fuel is burned in the converter, less combustion gas is generated. Therefore, in the converter, the inconvenience that the gas generated by melting the concentrate will not be significantly diluted by the combustion gas will occur, and the exhaust gas of the converter will have the same SO ₂ concentration as before. can be maintained at a high level and treated in a sulfuric acid plant. Therefore, compared to the case where the entire amount of concentrate to be melted is melted in a reverberatory furnace, the amount of exhaust gas to be treated at the gypsum plant is reduced, making it possible to reduce exhaust gas treatment costs.

"Problems to be Solved by the Invention" However, as shown in Figure 6 above, if the tuyere 2 is simply modified significantly, new problems will arise in terms of handling of the converter, etc. It will happen.

In other words, the tuyere 2 is usually approximately
There are nearly 50 of them, and because there are so many,
When an existing converter is to be remodeled, the remodeling method described above will result in extremely time-consuming remodeling work.

In addition, when injecting concentrate from the tuyere as described above, solid fuel is also injected as needed, but in order to accurately adjust the amount of solid fuel injected to ensure good melting, it is necessary to There is a need to more accurately detect the temperature of the solution inside the furnace body, and until now the temperature inside the furnace body has been detected by inserting a thermocouple through an opening formed in the upper part of the furnace body. Ta.

However, with this method, it is only possible to detect the temperature on the surface side of the solution, and the temperature can only be detected instantaneously due to the splash, so it is difficult to accurately detect the temperature of the furnace body. It was difficult to detect the temperature of the solution inside, and this was considered an issue to be solved in the future.

This invention was made in view of the above circumstances,
By attaching it to the tuyere of the furnace body, it is possible to accurately and continuously detect the temperature of the solution near the tuyere. It is extremely easy to modify the tuyere, and it is easy to attach and detach when attaching it to the tuyere. By doing so, the mounting position can be made mutually compatible with the concentrate blowing device,
Therefore, it is an object of the present invention to provide a temperature detection device that can detect the temperature of the solution in the furnace body from any tuyere and can more accurately obtain the temperature distribution of the solution.

"Means for Solving the Problems" In order to achieve the above-mentioned object, the temperature detection device according to the present invention is inserted into a passageway leading into the furnace body of a tuyere in a converter for copper smelting. a straight guide tube defining an annular air passage along an inner circumferential surface; a locking pin protruding from an end of the tuyere; and an engagement groove of a detachable part fixed to the guide tube. an attachment/detachment mechanism for attaching and detaching the guide pipe to and from the tuyere by engaging and detaching the guide tube; and a tapered curved surface that is installed inside the attachment/detachment part and matches the inner circumferential surface of the tapered end of the tuyere. stored in a packing and an elastic material storage section provided on the rear end side of the guide tube of the detachable section;
While urging the packing toward the tuyere side,
a resilient material that urges the attachment/detachment portion toward the rear end of the guide tube; and a resilient material for preventing the solution and gas in the furnace body from leaking from the guide tube to the outside of the converter;
A transparent partition plate made of heat-resistant glass is placed at the rear end of the guide tube, and the color of the solution in the furnace body is detected through the partition plate and the passage inside the guide tube, and the temperature of the solution is determined from this color. a radiation-type thermometer for detection, and an engagement groove of the detachable portion includes a pin introduction portion extending toward the tuyere side and opening at the tip of the detachment portion; It is essential that the attachment/detachment part has a substantially hook-shaped configuration including an intermediate portion extending in the circumferential direction of the attachment/detachment portion, and a terminal end locking portion extending from the termination end of the intermediate portion toward the tuyere side.

"Function" The temperature detection device uses a radiation thermometer to
Since the temperature of the solution is detected without direct contact with the solution, even when used for a long period of time, there is no possibility of dust or the like adhering to the sensor and reducing its functionality.

Moreover, because of the air passage defined around the guide pipe, a layer of air flow (air curtain) is formed almost uniformly along the inner circumferential surface of the passage of the tuyere.
Since these airflows uniformly hit the entire inner circumference of the tuyere end opening into the converter, the melt in the converter is effectively suppressed from adhering and solidifying to the tuyere end, and the tuyere blockage is prevented, and temperature detection can be performed satisfactorily and continuously over a long period of time.

Moreover, in order to attach the temperature detection device,
The only new member provided on the tuyere side is the aforementioned locking pin. Therefore, even when the converter is installed in an existing converter, the modification to the existing converter can be made only by protruding the locking pin from the tuyere, which can be accomplished extremely easily.

Further, the attachment/detachment mechanism is configured such that the engagement groove is formed into a substantially hook shape having a pin introduction portion, an intermediate portion, and a terminal engagement portion, thereby allowing the engagement and detachment of the engagement pin and the engagement groove. This makes it easy to attach and detach the guide pipe to and from the tuyere. If the guide pipe is used as a passage for concentrate as in the concentrate blowing device described later, the above-mentioned attachment/detaching mechanism can be used as is as a mechanism for attaching/detaching to the tuyere of the concentrate blowing device. Furthermore, by making the temperature detection device and the concentrate blowing device have a common attachment/detachment mechanism to the tuyere, the mounting position can be mutually compatible with the concentrate blowing device. The temperature of the solution in the furnace body can be continuously detected from the tuyeres, and the temperature distribution of the solution can be obtained more accurately.

“Embodiment” An embodiment of the present invention will be described below based on the drawings.

FIG. 1 and FIG. 2 each show a sectional view of a main part of a converter equipped with a temperature detection device according to the present invention.

The converter 20 shown here has a concentrate blowing device 2 installed in a tuyere 22 disposed on the side of a furnace body 21.
3 and through the concentrate blowing device 23,
The concentrate is injected into the solution (copper) in the furnace body 21 through the tuyere 22, so that the concentrate can be melted in parallel with the oxidation treatment of the coating produced in the reverberatory furnace in the previous process. , the structure of the furnace body 21 and the tuyere 2
For configuration 2, the end portion of the tuyere 22 (the first
This is the same as the conventional product shown in FIG. 5, except that a locking pin 24 for locking the concentrate blowing device 23 is provided protruding from the outer periphery (right end in the figure).

That is, the furnace wall of the furnace body 21 is composed of a brick wall 1a and an iron plate wall 1b, and the tuyeres 22 are connected to the furnace body 2.
1, and a joint part 4 connected to the outer end of the main body part 3. A passage 3a provided by the main body 3 is branched into two branch passages 4a and 4b. Of the two branch passages 4a and 4b, a blower pipe 5 is connected to one branch passage 4a as in the case of FIG.
b is formed as a straight extension of the end of the passage 3a in order to insert a punching rod (not shown) into the main body 3, and the punching rod is pulled out from the end of the passage 3a. A valve mechanism 8 is provided in which the ball 6 falls onto the valve seat 7 and automatically closes the passage 4b.

The locking pin 24 is provided to protrude from the outer periphery of the end of the joint portion 4 on the side of the branch passage 4b so as to extend in the radial direction.

In this way, the tuyere 2 from which the locking pin 24 is protruded
2 are provided on the side of the furnace body 20 at appropriate pitches, in the same manner as in the past, approximately 50 of which are equipped with a concentrate injection device 23 as shown in FIG. As shown in FIG.
is installed.

As shown in FIG. 3, the concentrate blowing device 23 has a straight pipe shape and has an outer diameter equal to that of the tuyere 22.
The annular air passage 26 is set to be smaller than the diameter of the passage 3a of the main body part 3, and is inserted into the passage 3a to form an annular air passage 26 between the inner peripheral surface of the main body part 3 and the inner peripheral surface of the main body part 3.
(see FIG. 1), an auxiliary installation tube 28 fixed to the rear end of the guide tube 27 (the right end in FIG. 3), and an auxiliary tube 28 connected to the rear end of the auxiliary tube 28. A concentrate supply hose 29, a pressure feeding device (not shown) that feeds concentrate, solid fuel (pulverized coal), etc. to the guide pipe 27 by air pressure through the hose 29, and It is configured to include a handle 30 that is fixedly provided for attachment and detachment.

The auxiliary attachment pipe 28 is connected to the hose 29
A communication tube portion 28a serves to communicate the guide tube 27 with the guide tube 27, and a communication tube portion 28a that extends from the distal end of the communication tube portion 28a to the distal end side of the guide tube 27 (left end side in FIG. 3) and extends around the guide tube 27. The structure includes an intermediate enlarged diameter part 28c that forms an elastic material storage part 28b, and a detachable part 28d that further expands in diameter from the distal end of the intermediate enlarged diameter part 28c and extends toward the distal end side of the guide tube 27. ing.

The removable part 28d has a cylindrical shape, and a heat-resistant rubber gasket 31 is installed inside the removable part 28d.
An elastic material 32 that urges the packing 31 toward the tuyere 22 and pushes the auxiliary attachment tube 28 back toward the rear end is stored in the elastic material storage portion 28b.

As shown in FIG. 4, an engagement groove 33 that engages with a locking pin 24 protruding from the tuyere 22 is formed on the distal end side of the detachable portion 28d. As is clear from FIG. 4, the engagement groove 33 is a notched groove that is generally hook-shaped as a whole, and extends in the direction of extension of the detachable portion 28d (to the left in FIG. 4), and extends to the tip of the detachable portion 28d. An open pin introduction part 33a, an intermediate part 33b extending in the circumferential direction (vertical direction in FIG. 4) from the end of the pin introduction part 33a, and a terminal fitting extending from the terminal end of the intermediate part 33b toward the tuyere 22 side. The structure includes a stop portion 33c.

As is clear from FIG. 3, the tip of the guide tube 27 (the left end in FIG. 3) is cut diagonally, and the rear end is chamfered on the inner circumferential side to form a tapered portion 27a. There is. The tapered portion 27a
When the pulverized coal and concentrate that serve as fuel are sent from the concentrate supply hose 29, these are transferred to the guide pipe 27.
This is designed to ensure that the guide tube 27 is guided smoothly into the guide tube 27 without colliding with the end face of the guide tube 27.

The gasket 31 has a tapered curved surface 31a on the tip side that matches the tapered end inner peripheral surface of the tuyere 22 whose diameter increases toward the end. By coming into close contact with the inner circumferential surface of the end of the tuyere 22, the joint between the tuyere 22 and the concentrate blowing device 23 is sealed.

The work of attaching and detaching the concentrate blowing device 23 to and from the tuyere 22 is easy. That is, when installing, the guide tube 27 is inserted into the passage 3a of the tuyere 22, the position of the pin introduction part 33a is aligned with the locking pin 24 on the tuyere 22 side, and the guide pipe 27 is inserted into the pin introduction part 33a. The stop pin 24 is inserted, and then the handle 30 is inserted.
The locking pin 24 may be positioned at the end of the intermediate portion 33b by rotating the attachment/detachment portion 28d. Then, the entire blowing device 23 is pushed back in the direction of arrow B in FIG. 1 by the biasing force of the resilient material 32, and the locking pin 24 engages with the end locking portion 33c as shown in FIG. , the blowing device 23 is fixed to the tuyere 22. To remove it, first push the handle 30 slightly toward the tuyere 22 to remove the engagement pin 24 from the end locking part 33c, and then perform the operation in the reverse order of the installation.

The temperature detection device 25 is according to the present invention, and as is clear from FIG. ,
It is equipped with an explosive material 32, etc., and a blowing device 23
It can be attached to and detached from the tuyere 22 by a similar operation. This temperature detection device 25 includes a transparent partition plate 35 made of heat-resistant glass at the rear end of the auxiliary attachment tube 28, and the partition plate 35 and the guide tube 27.
A radiation type thermometer 36 which detects the temperature of the solution from the color of the solution in the furnace body 21 through a passage inside the furnace body 21 is arranged in order. The temperature can be checked on a display device, control device, etc. located at a remote location.

The temperature detection devices 25 are provided in an appropriate number and distributed at an appropriate number of locations among the large number of tuyeres 22, and detect the melt in the furnace body 21 by integrating the detected values of each temperature detection device 25. Consideration has been given to making it possible to understand the temperature distribution.

A plurality of the concentrate blowing devices 23 are disposed depending on the amount of concentrate injected, etc., and in this case, the placement position is determined in such a way that the temperature detecting device 25 is set based on the detected value.

The handling and operation of the converter 20 described above will be explained below.

Since the concentrate blowing device 23 can be easily attached to and detached from the tuyere 22, it can be used to receive the coal produced in the melting process or to transfer the blister copper produced in the furnace body 21 to the refining furnace for the next refining process. To,
When rotating the furnace body 21 by a predetermined angle, the concentrate blowing device 23 is removed from the tuyere 22.
By doing so, it becomes easier to handle the furnace body 21 when rotating it, and the problem of having to secure a large empty space around the furnace body 21 is solved.
It becomes possible to minimize the empty space secured around the converter 20 in order to avoid interference with surrounding equipment when the converter 20 rotates.

When the sludge produced in the previous process is received in the furnace body 21 and the concentrate is melted in parallel with the oxidation treatment of the sludge, after receiving the sludge, an appropriate number of concentrate blowing devices are installed. 23 is properly dispersed and attached to the tuyere 22, and the temperature detection device 25 is attached to one or several places, and then each concentrate blowing device 23 injects concentrate or concentrate and fine powder. A mixture of solid fuel such as charcoal is blown in using air pressure, and on the other hand, air is pumped through the blast pipe 5. In this case, the amount of air pumped, the amount of solid fuel blown, the amount of concentrate blown, etc. are adjusted as appropriate based on the temperature distribution etc. detected by the temperature detection device 25.

If the temperature distribution is not uniform, adjustment is made by changing the installation position of the concentrate blowing device 23, but even in such a case, the attachment/detachment mechanism for the concentrate blowing device 23 and the temperature detection device 25 is common. Therefore, it is easy to exchange the positions with each other, and therefore, the installation position of the concentrate blowing device 23 is not restricted by the temperature detection device 25, and can be freely changed. tuyere 22
By injecting concentrate or solid fuel along with air, the temperature distribution of the solution can be manipulated more precisely.

Moreover, in the temperature detection device 25, because of the air passage defined around the guide pipe,
A layer of airflow (air curtain) is formed almost uniformly along the inner peripheral surface of the tuyere passage, and this airflow uniformly hits the entire inner circumference of the tuyere end that opens into the converter. , the melt in the converter is effectively suppressed from adhering to and solidifying at the end of the tuyere, and clogging of the tuyere is prevented, so that it can be continuously carried out over a long period of time, and
Temperature detection can be performed satisfactorily.

To explain the situation inside the furnace body 21 when the concentrate is being blown by the blowing device 23, the injected concentrate is prevented from spreading by the guide pipe 27 of the blowing device 23. It enters the furnace body 21 through approximately the central axis of the passage 3a that opens into the body 21. Since the air passage 26 is formed in an annular shape around the guide pipe 27, an annular layer of air flow (air curtain) is formed around the outer periphery of the flow of the blown concentrate. The inner peripheral surface of the passage 3a is protected by the layer of air. Therefore, the injected concentrate is prevented from colliding with the inner circumferential surface of the passage 3a, and damage to the tuyere 22 due to collision of the concentrate is prevented, and the life of the tuyere 22 is extended.

In addition, when the concentrate blowing position and the air blowing position are formed concentrically and orderly in this way, over the entire inner circumference of the opening end of the passage 3a that opens into the converter 20, The air is applied uniformly, and the effect of blowing off the solution adhering to the open end of the passage 3a is made uniform over the entire inner circumference of the passage 3a by this air flow and the blown out concentrate. As a result, the melt in the converter 20 adheres to the tuyere end.
Coagulation is also effectively inhibited.

Furthermore, some of the large number of tuyeres 22 installed in the furnace body 21 are connected to the blowing device 23.
is installed, and some others are equipped with a temperature detection device 2.
5 is attached, and the others are not attached at all and simply pump air. In that case,
The injected concentrate is naturally melted by the heat of the melt in the furnace body and the combustion heat of the solid fuel injected together, without being particularly heated with a burner, etc.; The heating is not carried out all at once near the tuyere 22, but is carried out gradually as the solution is stirred by the airflow within the furnace body.

The melting of the concentrate and the combustion of the solid fuel will be explained as follows.

In the vicinity of the tuyere 22 where the concentrate and solid fuel are injected, there is not enough air to completely burn the solid fuel, and the solid fuel is in an incomplete combustion state, resulting in a significant temperature rise. is not observed, and there is no significant temperature difference from other tuyere areas. Then, the incompletely burned fuel is removed from the other tuyeres 22 through which only air is blown by stirring the solution.
It gradually burns as it comes into contact with magnetite (Fe ₃ O ₄ ) produced near the . Therefore, the temperature distribution of the solution within the furnace body is maintained substantially uniform.

In addition, since sufficient air is not obtained near the tuyere 22 into which the concentrate is blown, a large amount of FeS remains without being oxidized together with Cu ₂ S. on the other hand,
In the vicinity of the tuyere 22 where only air is blown, oxidation becomes excessive, and some iron progresses to oxidation to Fe ₃ O ₄ . Then, due to the stirring action of the solution by the air flow, the FeS and Fe ₃ O ₄ come into contact with each other, causing a ring element reaction as shown in the following formula.

FeS+3Fe ₃ O ₄ →10FeO+SO ₂ Therefore, since the exothermic reaction of oxidation and the endothermic reaction of ring element occur in the same reactor body, the temperature distribution of the solution can be maintained extremely uniformly, and the temperature distribution can be maintained evenly under good conditions. The oxidation treatment and melting of the concentrate are progressing, and a good quality product can be obtained.

Regarding the converter body 21 and the tuyere 22, the converter 20 differs from the conventional one only in a locking pin 24 protruding from the outer periphery of the end of the tuyere 22. Therefore, even when modifying an existing converter, the modification work is extremely easy.
And it can be done inexpensively.

The following two examples of actual operation of the converter 20 described above were carried out.

One is the so-called continuous melting method, in which the seed material is first introduced from the reverberatory furnace, then the tuyere 22
From there, only air is blown into the finished product to improve its quality. After that, no coal is received from the reverberatory furnace, and the concentrate blowing device 2
Concentrate and solid fuel are continuously injected from step 3 to dissolve a predetermined amount of concentrate and oxidize it. In this case, the amount of air blown through the tuyere 22 is set to the minimum required for the combustion of the newly blown solid fuel, the melting of the concentrate, and its oxidation treatment. Care was taken to prevent further oxidation. According to this operating method, the quality of the glue in the furnace body 21 could be kept almost constant at all times, and stable operation could be performed.

The other method is to inject a predetermined amount of concentrate and solid fuel each time the karami in the converter is discharged and new karami is received from the reverberatory furnace. The amount of air blown in from the port 22 is smaller than in the case of the continuous melting type, so that in addition to the combustion of the solid fuel and the oxidation treatment of the blown concentrate, the oxidation treatment of the slag already in the furnace is carried out smoothly. I set a lot.

Both of these methods had good operability and good results were obtained.

"Effects of the Invention" As is clear from the above description, the temperature detection device according to the present invention is inserted into a passageway leading into the furnace body of a tuyere in a converter for copper smelting, and extends along the inner circumferential surface of the passageway. A straight guide pipe defining an annular air passage, a locking pin protruding from the end of the tuyere, and an engagement groove of a detachable portion fixed to the guide pipe are engaged and disengaged. an attachment/detachment mechanism for attaching and detaching the guide tube to the tuyere; a packing fitted inside the attachment/detachment portion and having a tapered curved surface that matches the inner circumferential surface of the tapered end of the tuyere; stored in an elastic material storage section provided on the rear end side of the guide tube of the detachable section,
While urging the packing toward the tuyere side,
In order to prevent gas from leaking from the guide tube to the outside of the converter, a resilient material biases the attachment/detachment portion toward the rear end side of the guide tube, and a melt in the furnace body prevents gas from leaking from the guide tube to the outside of the converter.
A transparent partition plate made of heat-resistant glass is placed at the rear end of the guide tube, and the color of the solution in the furnace body is detected through the partition plate and the passage inside the guide tube, and the temperature of the solution is determined from this color. a radiation-type thermometer for detection, and an engagement groove of the detachable portion includes a pin introduction portion extending toward the tuyere side and opening at the tip of the detachment portion; It is essential that the attachment/detachment part has a substantially hook-shaped configuration including an intermediate part extending in the circumferential direction and a terminal end locking part extending from the terminal end of the intermediate part toward the tuyere side, and the radial type Since the thermometer detects the temperature of the solution without making direct contact with the solution, even when used for a long period of time, there is no possibility of dust or the like attaching to the thermometer and reducing its functionality.

Moreover, because of the air passage defined around the guide pipe, a layer of air flow (air curtain) is formed almost uniformly along the inner circumferential surface of the passage of the tuyere.
Since these air flows uniformly hit the entire inner circumference of the tuyere end opening into the converter, the melt in the converter is effectively prevented from adhering to and coagulating on the tuyere end, and the Since the mouth is prevented from being blocked, temperature can be detected continuously and satisfactorily over a long period of time.

Moreover, in order to attach the temperature detection device,
The only new member provided on the tuyere side is the aforementioned locking pin. Therefore, even when the converter is installed in an existing converter, the modification to the existing converter can be made only by protruding the locking pin from the tuyere, which can be accomplished extremely easily.

Furthermore, the engagement groove of the detachable part that engages and disengages with the locking pin protruding from the outer periphery of the end of the tuyere is replaced by a pin introduction part that extends toward the tuyere and opens at the tip of the detachable part, and It has a substantially hook-shaped configuration including an intermediate portion extending from the end in the circumferential direction of the detachable portion, and a terminal end locking portion extending from the terminal end of the intermediate portion toward the tuyere side. The elastic material is stored in a packing having a tapered curved surface that matches the inner circumferential surface of the tapered end of the tuyere, and an elastic material storage section provided at the rear end side of the guide tube of the attaching/detachable part. When installing the guide pipe in the tuyere, the locking pin is aligned with the pin introduction part of the engagement groove, and the locking pin is pushed to the end of the pin introduction part, and then, By rotating the attachment/detachment part and positioning the locking pin at the end of the intermediate part, the attachment/detachment part is pushed back by the urging force of the resilient material, and the locking pin is firmly engaged with the end locking part. At the same time, the tapered curved surface of the packing is pressed against the inner circumferential surface of the end of the tuyere by the urging force of the elastic material, so that the tip of the packing is brought into contact with the inner circumferential surface of the end of the tuyere and the guide pipe. Therefore, the space between the packing and the tuyere and between the packing and the guide tube is reliably sealed, and when the guide tube is removed from the tuyere, the attachment/detachment part is compressed. After removing the locking pin from the end locking part by pushing it slightly toward the tuyere side, the attachment of the elastic material is done by rotating the attachment/detachment part and moving the locking pin along the middle part to the end. Due to the force, the locking pin is smoothly disengaged from the engagement groove of the attachment/detachment portion, so that the guide tube can be easily attached to and detached from the tuyere. If the guide pipe is used as a passage for concentrate as in the concentrate blowing device described later, the above-mentioned attachment/detaching mechanism can be used as is as a mechanism for attaching/detaching to the tuyere of the concentrate blowing device. Furthermore, by making the temperature detection device and the concentrate blowing device have a common attachment/detachment mechanism to the tuyere, the mounting position can be mutually compatible with the concentrate blowing device. The temperature of the solution inside the furnace body can be continuously detected from the tuyere, making it possible to obtain the temperature distribution of the solution more accurately.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of the main parts of a converter equipped with an embodiment of the present invention, FIG. 3 is an enlarged view of the concentrate injection device in FIG. 1, and FIG. The arrow direction view, FIG. 5, and FIG. 6 are sectional views of the main parts of a conventional converter, respectively. 1a...Brick wall, 1b...Iron plate wall, 3...Main part, 4...Joint part, 4a, 4b...Branch passage, 5...Blow pipe, 6...Ball, 7...Valve seat,
8... Valve mechanism, 20... Converter, 21... Furnace body,
22...Tuyere, 23...Concentrate blowing device, 24
... Locking pin, 25 ... Temperature detection device, 26 ...
Air passage, 27... Guide pipe, 28... Auxiliary pipe for attachment, 28a... Communication pipe section, 28b... Resilient material storage section, 28c... Intermediate expanded diameter section, 28d... Attachment/detachment section, 29... Concentrate supply hose, 30...handle, 31...packet, 31a...curved surface, 32...
... Resilient material, 33 ... Engagement groove, 33a ... Pin introduction part, 33b ... Middle part, 33c ... End locking part,
35...Transparent partition plate, 36...Radiation type thermometer.

Claims (1)

[Claims] 1. A converter for copper smelting in which concentrate or concentrate and fuel are injected into the furnace body through the tuyeres to melt the concentrate in parallel with the oxidation treatment of the solution in the furnace body. A temperature detection device for detecting temperature, the straight guide tube being inserted into a passage of the tuyere leading into the furnace main body and defining an annular air passage along the inner circumferential surface of the passage; an attachment/detachment mechanism for attaching and detaching the guide tube to the tuyere by engaging and disengaging a locking pin protruding from the outer periphery of an end of the tuyere and an engagement groove of an attachment/detachment portion fixed to the guide tube; , a packing installed inside the detachable part and having a tapered curved surface that matches the inner circumferential surface of the tapered end of the tuyere; and a spring provided on the rear end side of the guide tube of the detachable part. An elastic material is stored in the material storage section and urges the packing toward the tuyere side and urges the attachment/detachment section toward the rear end of the guide tube. In order to prevent leakage from the guide tube to the outside of the converter, there is a transparent partition plate made of heat-resistant glass placed at the rear end of the guide tube, and a transparent partition plate made of heat-resistant glass is provided to prevent leakage from the guide tube to the outside of the converter. a radiation thermometer that detects the color of the solution in the main body and detects the temperature of the solution from this color, and the engagement groove of the detachable part extends toward the tuyere side and The pin introduction part has an opening at the tip, an intermediate part extending from the end of the pin introduction part in the circumferential direction of the detachable part, and a terminal locking part extending from the terminal end of the intermediate part toward the tuyere side. A temperature detection device for a melt in a converter for copper smelting, characterized by having a substantially hook-shaped configuration.