JPS642174B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a concentrate injection device for injecting concentrate etc. into 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 the end of the passage 3a is straightly extended, 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 into the passage.

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 melted by the exothermic reaction 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, simply modifying the tuyere 2 creates new problems in handling the converter, etc. Put it away.

In other words, the tuyere 2 is usually approximately
There are nearly 50 of them, and because there are so many,
When modifying an existing converter, the modification work is very time-consuming.

As the name suggests, a converter is used to receive the matte produced in the reverberatory furnace during the melting process, or to transfer blister copper obtained by oxidizing the matte in the furnace to the refining furnace in the refining process. Rotate the furnace body 1 by about 90 degrees in the direction shown by arrow A in FIG.
Therefore, as shown in FIG. 6, if the branch passage 9 is simply added to the tuyere 2 and the concentrate transport pipe 10 is integrally joined to the branch passage 9, the furnace body 1
When the concentrate transport pipe 10 rotates, the concentrate transport pipe 10 also rotates, and it is necessary to provide flexibility to the concentrate transport pipe 10, and to prevent the concentrate transport pipe 10 from interfering with surrounding equipment during rotation. , concentrate transport pipe 10
A problem arises in that a large empty space must be secured around the furnace body 1, taking into full consideration the behavior of the furnace. In addition, since flexibility is imparted to the concentrate transport pipe 10, if a flexible hose made of synthetic resin or synthetic rubber is used as the concentrate transport pipe 10, the passage of the concentrate can be maintained in a straight line. As a result, friction between the inner surface of the transport pipe 10 and the concentrate being transported becomes intense, causing problems such as the transport pipe 10 being more likely to be damaged due to wear.

Furthermore, as shown in FIG. 6, if the branch passage 9 for feeding the concentrate is inclined with respect to the passage 3a of the main body 3 of the tuyere 2, the concentrate will be transferred to the passage 3a.
This results in a violent collision with the inner surface of the tuyere 2, resulting in a problem that the life of the tuyere 2 is shortened.

This invention was made in view of the above circumstances,
Even when installed in an existing converter, it is extremely easy to modify the existing converter, and it can be easily attached to and removed from the tuyere, making it easy to operate the converter in rotation. In some cases, removing the converter makes it easier to handle the converter, minimizes the amount of empty space around the converter, and allows the blowing of concentrate to It is an object of the present invention to provide a concentrate blowing device with a new configuration that can prevent inconveniences such as shortening of the lifespan of the spout.

"Means for Solving the Problems" In order to achieve the above-mentioned object, the concentrate blowing device according to the present invention is inserted into a passageway of the tuyere that leads into the furnace body, and is inserted along the inner circumferential surface of the passageway. A guide pipe that defines an annular air passage; a pumping device that pumps concentrate etc. into the guide pipe; a locking pin protruding from the end of the tuyere; and a detachable pin fixed to the guide pipe. an attachment/detachment mechanism for attaching and detaching the guide tube to the tuyere by engaging and disengaging with an engagement groove of the tuyere; A packing having a curved surface of the shape of The engaging groove of the attachment/detachment part is made of an elastic material that urges the rear end side of the guide tube, and
a pin introduction part extending toward the tuyere side and opening at the tip of the detachable part; an intermediate part extending in the circumferential direction of the detachable part from an end of the pin introduction part; and a terminal end of the intermediate part towards the tuyere side. It is essential to have a substantially hook-shaped configuration with a terminal locking portion extending from the bottom to the bottom.

``Function'' With such a configuration, even when reusing an existing converter, the modification to the existing converter can be accomplished by simply installing a locking pin protruding from the tuyere, making it extremely simple. I can do it.

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 from the tuyere, and when the converter is rotated, the guide pipe is removed from the tuyere. The converter can be easily handled, and the empty space around the converter can be minimized.

Moreover, in the concentrate blowing device, an air layer (air curtain) is formed along the inner peripheral surface of the tuyere passage due to the air passage defined around the guide pipe. Since the concentrate is blown into the layer, the inner peripheral surface of the tuyere is protected by the layer of air. Therefore, problems such as shortening of the life of the tuyere due to collision of the concentrate with the inner circumferential surface of the tuyere are prevented.

In addition, when the concentrate blowout position and the air blowout position are arranged concentrically and orderly in this way, air is uniformly distributed over the entire inner circumference of the tuyere end that opens into the converter. The effect of blowing off the solution adhering to the tuyere end is made uniform over the entire inner circumference of the tuyere end by this air flow and the blown out concentrate, and the converter This also effectively suppresses the adhesion and solidification of the solution inside the tuyere end.

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

FIG. 1 and FIG. 2 each show a cross-sectional view of the main part of a converter equipped with a concentrate blowing device according to the present invention.

The converter 20 shown here has a concentrate blowing device 23 according to the present invention attached to a tuyere 22 provided on the side of a furnace body 21, and the concentrate blowing device 2 is equipped with a concentrate blowing device 23 according to the present invention.
3, the concentrate can be blown into the solution (copper) in the furnace body 21 from the tuyere 22, and the concentrate can be melted in parallel with the oxidation treatment of the coating produced in the reverberatory furnace in the previous step. The furnace body 21
Regarding the structure of the tuyere 22 and the configuration of the tuyere 22,
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 of the end (right end in FIG. 1) of 2.

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. 2, a monitoring device 25 for monitoring the temperature state of the solution in the furnace body 21 is installed in the remaining appropriate number of devices.

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.

As is clear from FIG. 2, the monitoring device 25, like the concentrate blowing device 23, includes the guide pipe 27, the auxiliary attachment pipe 28, and the handle 3.
0, a packing 31, an elastic material 32, etc., and can be attached to and detached from the tuyere 22 by the same operation as the blowing device 23. This monitoring device 25 includes a transparent partition plate 35 made of heat-resistant glass at the rear end of the auxiliary attachment tube 28, and detects the temperature of the solution from the color of the solution in the furnace body 21 via the partition plate 35. The temperature of the solution detected by the radiation type thermometer 36 can be checked on a display device or a control device located at a remote location. ing.

The monitoring devices 25 are installed in an appropriate number at an appropriate number of locations among the large number of tuyeres 22, and by integrating the detected values of each monitoring device 25, the temperature of the solution in the furnace body 21 can be determined. Care has been taken to make the distribution clear.

A plurality of the concentrate injection devices 23 are installed depending on the amount of concentrate injection, etc., and in this case, the installation position is determined according to the monitoring device 25 so that melting can be carried out smoothly under appropriate circumstances. It 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 are properly dispersed and attached to the tuyere 22, and the monitoring device 25 is attached to one or several places, and then concentrate or concentrate and pulverized coal are poured from each concentrate blowing device 23. A mixture of solid fuels such as, etc. 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 monitoring device 25.

To explain the situation inside the furnace body 21 when concentrate is being blown in 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 attached, some others are attached with the monitoring device 25, and the others are not attached with anything and simply pump air. In that case, the injected concentrate is melted by the heat of the melt in the furnace body and the combustion heat of the solid fuel injected together, without having to be particularly heated with a burner, etc.; This is not done all at once near the blown tuyere 22, but is done 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 reduction reaction shown by 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 concentrate blowing device according to the present invention is inserted into a passage of the tuyere that leads into the furnace body, and air is annularly formed along the inner circumferential surface of the passage. A guide pipe defining a passage, a pumping device for pumping concentrate etc. into the guide pipe, engagement of a locking pin protruding from the end of the tuyere and a detachable part fixed to the guide pipe. an attachment/detachment mechanism for attaching and detaching the guide pipe to/from the tuyere by engaging and disengaging with a groove; and a tapered curved surface that is installed inside the attachment/detachment portion and matches the inner circumferential surface of the tapered end of the tuyere. The packing is housed in a resilient material storage section provided on the rear end side of the guide tube of the attachment/detachment section, and urges the packing toward the tuyere side, and the attachment/detachment section is attached to the rear of the guide tube. The engaging groove of the attachment/detachment part is formed of a pin introduction part which extends toward the tuyere side and opens at the tip of the attachment/detachment part; It is essential that the attachment/detachment part has a substantially hook-shaped configuration including an intermediate part extending in the circumferential direction of the detachable part, and a terminal end locking part extending from the terminal end of the intermediate part toward the tuyere side.
Even when the converter is used in an existing converter, the modification to the existing converter can be made only by protruding locking pins from the tuyeres, which can be accomplished extremely easily.

In addition, the engagement groove of the detachable part that engages and disengages with the locking pin drilled on 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 an intermediate portion extending from the end in the circumferential direction of the detachable portion;
It has a substantially hook-shaped configuration with a terminal locking part extending from the terminal end of the intermediate part toward the tuyere side, and is mounted inside the detachable part and attached to the inner peripheral surface of the tapered end of the tuyere. a patchkin with a matching tapered curved surface;
and an elastic material stored in an elastic material storage section provided on the rear end side of the guide tube of the detachable part.
When attaching the guide tube to the tuyere, align the locking pin with the pin introduction part of the engagement groove, push the locking pin to the end of the pin introduction part, and then rotate the attachment/detachment part to push the locking pin. By positioning it at the end of the intermediate portion, the attachment/detachment portion is pushed back by the biasing force of the resilient material, and the locking pin is firmly engaged with the end locking portion, and the tapered curved surface of the packing is pushed back. 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 compressed by being sandwiched between the inner circumferential surface of the end of the tuyere and the guide pipe, Therefore, the spaces between the packing and the tuyere and between the packing and the guide tube are reliably sealed, and when removing the guide tube from the tuyere, the removable part must be pushed slightly toward the tuyere to release the locking pin. After it is removed from the terminal locking part, by rotating the detachable part and moving the locking pin along the middle part to the end, the locking pin is released from the locking part by the urging force of the elastic material. It can be smoothly removed from the joint groove, and therefore the guide pipe can be easily attached to and removed from the tuyere, and when the converter is rotated, the guide pipe can be removed from the tuyere. Therefore, handling of the converter can be facilitated, and the free space secured around the converter can be minimized.

Moreover, in the concentrate blowing device, an air layer (air curtain) is formed along the inner peripheral surface of the tuyere passage due to the air passage defined around the guide pipe. Since the concentrate is blown into the layer, the inner peripheral surface of the tuyere is protected by the layer of air. Therefore, problems such as shortening of the life of the tuyere due to collision of the concentrate with the inner circumferential surface of the tuyere are prevented.

In addition, when the concentrate blowout position and the air blowout position are arranged concentrically and orderly in this way, air is uniformly distributed over the entire inner circumference of the tuyere end that opens into the converter. The effect of blowing off the solution adhering to the tuyere end is made uniform over the entire inner circumference of the tuyere end by this air flow and the blown out concentrate, and the converter This also effectively suppresses the adhesion and solidification of the solution inside the tuyere end.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of essential parts of an embodiment of the present invention, FIG. 3 is an enlarged view of the concentrate blowing device in FIG. 1, and FIG. 4 is a view taken in the direction of the arrow in FIG. 3. FIGS. 5 and 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 . ...Intermediate enlarged diameter part, 28d...Detachable part,
29... Concentrate supply hose, 30... Handle, 3
DESCRIPTION OF SYMBOLS 1... Packing, 31a... Curved surface, 32... Resilient material, 33... Engagement groove, 33a... Pin introduction part, 3
3b...middle part, 33c...terminal locking part, 35...
...Transparent partition plate, 36... Radiation type thermometer.

Claims (1)

[Claims] 1 A concentrate injection device that is attached to the tuyere of a converter for copper smelting and injects concentrate or concentrate and fuel into the converter from the tuyere, the tuyere communicating into the furnace body. A guide pipe inserted into the passage to define an annular air passage along the inner circumferential surface of the passage, a pumping device for pumping concentrate, etc. into the guide pipe, and a pipe bored on the outer periphery of the end of the tuyere. an attachment/detachment mechanism for attaching and detaching the guide tube to and from the tuyere by engaging and disengaging a locking pin fixed to the guide tube and an engagement groove of an attachment/detachment portion fixed to the guide tube; , a packing having a tapered curved surface that matches the inner circumferential surface of the tapered end of the tuyere, and a resilient material storage part provided at the rear end side of the guide tube of the attaching/detachable part; and an elastic member that urges the removable portion toward the tuyere side and the removable portion toward the rear end of the guide tube, and an engagement groove of the removable portion extends toward the tuyere side. a pin introduction part opening at the tip of the detachable part; 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 concentrate injection device for a converter for copper smelting, characterized by having a substantially hook-shaped configuration.