JPS642173B2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a converter for copper smelting that is capable of melting concentrate in parallel with the oxidation treatment of slag produced in the melting furnace. It is.

``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, there is no problem such as the gas generated by melting the concentrate being diluted significantly by the combustion gas, and the exhaust gas from the converter has 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,
The concentrate can be melted in the converter in parallel with the oxidation treatment of the slag, thereby reducing the fuel cost and exhaust gas treatment cost required for the melting process, and reducing the cost of the converter. For copper smelting with a new configuration that is easy to handle during rotation and minimizes the amount of free space reserved around the converter to avoid interference with surrounding equipment when the converter rotates. The purpose is to provide converters.

"Means for Solving the Problems" In order to achieve the above-mentioned object, the converter according to the present invention is provided at the end of the tuyere for injecting concentrate or concentrate and fuel into the melt in the furnace body. A valve seat is provided in the part of the tuyere, and a ball is movably provided between the valve seat and a standby position above the valve seat for opening and closing a passage of the tuyere leading into the furnace body. A guide tube defining an annular air passage along the inner peripheral surface of the passage is inserted into the passage leading into the furnace main body, and the tuyere is inserted between the end of the tuyere and the guide tube. an attachment/detachment mechanism for attaching and detaching the guide tube to the tuyere by engaging and disengaging a locking pin protruding from an end of the guide tube and an engagement groove of a detachable portion fixed to the guide tube; A tapered portion whose diameter increases toward the rear end is formed on the inner circumferential surface of the rear end of the guide tube, and an oblique exit portion is formed at the tip of the guide tube, and further, A slanted outlet portion is disposed within the passage of the tuyere with its slanted end face facing downward.

"Operation" In a converter having such a configuration, the concentrate fed through the guide tube 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.

In addition, since the guide tube can be easily attached and detached, the furnace body can be moved to a specified position to receive the copper produced in the melting process or to transfer the blister copper produced in the furnace to the refining furnace for the next refining process. When rotating the furnace body at an angle of This eliminates the problem of having to secure space, and it becomes possible to minimize the free space that must be secured around the converter in order to avoid interference with surrounding equipment when the converter rotates.

Furthermore, since a tapered part is formed on the inner peripheral surface of the rear end of the guide tube, the diameter of which increases toward the rear end, the concentrate and fuel introduced into the guide tube do not collide with the end surface of the guide tube and are guided smoothly. A slanted outlet is formed at the tip of the guide tube, and the slanted end of the slanted outlet is placed in the passage of the tuyere with the inclined end face facing downward, and the guide tube is attached to the tuyere. The concentrate or fuel introduced into the furnace body through the guide tube can be easily supplied to the bottom of the furnace body, so that it can be easily connected to the melt in the furnace body. Contact mixed.

“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 according to the present invention.

The converter 20 shown here has a concentrate blowing pipe 23 connected to a tuyere 22 disposed on the side of a furnace body 21.
The concentrate blowing pipe 23 is provided so as to be easily attachable and detachable.
Through the tuyere 22, concentrate or concentrate and fuel are injected into the solution (kawa) in the furnace body 21, and the concentrate is oxidized in parallel with the oxidation treatment of the raw material produced in the reverberatory furnace in the previous process. The structure of the furnace body 21 and the structure of the tuyere 22 are such that the concentrate injection pipe 23 is installed around the outer periphery of the end of the tuyere 22 (the right end in FIG. 1). This is the same as the conventional product shown in FIG. 5, except that a locking pin 24 for locking is provided in a protruding manner.

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 protruding from the outer periphery of the end of the joint portion 4 on the side of the branch passage 4b.

In this way, the tuyere 2 from which the locking pin 24 is protruded
As in the past, about 50 pipes 2 are provided at appropriate pitches on the side of the furnace body 21, and a suitable number of them are equipped with concentrate injection pipes 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 pipe 23 has a straight tube shape and has an outer diameter smaller than the diameter of the passage 3a of the main body 3 of the tuyere 22, and is inserted into the passage 3a. By doing so, an annular air passage 26 is formed between the inner peripheral surface of the main body portion 3 and the inner peripheral surface of the main body portion 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) for feeding concentrate, solid fuel (pulverized coal), etc. to the hose 29 using air pressure, and a pressure feeding device (not shown) fixed to the auxiliary pipe 28 for installation. It is configured to include a handle 30 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 mounted inside the removable part 28d.
and the elastic material 32 stored in the elastic material storage section 28b to urge the packing 31 toward the tuyere 22 side.
The attachment/detachment mechanism is constructed in cooperation with the following.

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, this engagement groove 33
a pin introduction part 33a that extends in the extending direction of 8d (leftward in FIG. 4) and opens at the tip of the detachable part 28d;
An intermediate portion 33b extending in the circumferential direction (vertical direction in FIG. 4) from the end of the pin introducing portion 33a;
Terminal locking part 3 extending from the terminal end of 3b toward the tuyere 22 side
3c.

The rear end (right end in FIG. 3) of the guide tube 27 is chamfered on the inner circumferential side to form a tapered part 27a, and the tip is cut diagonally to form an inclined outlet part 27b. The inclined outlet portion 27b is disposed in the passage 3a of the main body portion 3 with the inclined end face facing downward. The tapered portion 27a allows pulverized coal and concentrate to be fed as fuel from the concentrate supply hose 29 to be smoothly guided into the guide pipe 27 without colliding with the end face of the guide pipe 27. This was done in such a way that it would be easy to use.

The gasket 31 has a tip end formed into a curved surface that matches the end surface of the tuyere 22,
By closely contacting the curved surface 31a with the end surface of the tuyere 22, the joint between the tuyere 22 and the concentrate blowing pipe 23 is sealed.

The work of attaching and detaching the concentrate blowing pipe 23 to 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 tube 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 pipe 23 is the tuyere 2
It is fixed at 2. When removing the
First, the handle 30 is pushed slightly toward the tuyere 22 side to remove the engagement pin 24 from the end locking portion 33c, and then the operation is performed in the reverse order of the installation.

As is clear from FIG. 2, the monitoring device 25 includes the aforementioned guide tube 27, the auxiliary attachment tube 28, and the handle 3, similar to the concentrate blowing tube 23.
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 pipe 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 detection 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 pipes 23 are arranged depending on the amount of concentrate injection, etc., and in this case, the arrangement 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.

The concentrate blowing pipe 23 can be easily attached to and detached from the tuyere 22, so 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. When the furnace body 21 is rotated by a predetermined angle, the concentrate injection pipe 23 is removed from the tuyere 22. By doing so, it is possible to facilitate handling when rotating the furnace body 21, and
The problem of having to secure a large empty space around the furnace body 21 is solved, and the space that must be secured around the converter 20 to avoid interference with surrounding equipment when the converter 20 rotates is solved. It is possible to minimize space.

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 injection pipes are installed. 23 are appropriately distributed and attached to the tuyere 22, and the monitoring device 25 is attached to one or several places,
Next, concentrate or a mixture of concentrate and solid fuel such as pulverized coal is blown into each concentrate blowing pipe 23 using air pressure, and on the other hand, air is forced 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 into the blowing pipe 23, the injected concentrate is blown into the blowing pipe 23.
Since diffusion is prevented by the guide tube 27 of No. 3, the liquid enters the furnace body 21 through approximately the central axis of the passage 3a that opens into the furnace body 21. Then, the guide tube 2
Since the air passage 26 is formed in an annular shape around 7, an annular air flow (air curtain) is formed around the outer periphery of the flow of the injected concentrate. Therefore, the injected concentrate is
Collision with the inner circumferential surface of
The lifespan of will be extended.

Further, among the large number of tuyeres 22 installed in the furnace body 21, some of them are equipped with the blowing pipe 23, others are equipped with the monitoring device 25, and others are equipped with the blowing pipe 23. , nothing is attached and only air is pumped. 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 air flow inside 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 . Thereafter, 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 reduction occur in the same furnace body, the temperature distribution of the solution can be kept extremely uniform, and under good conditions it is possible to The oxidation treatment and the melting of the concentrate are carried out, and it becomes possible to obtain a good quality product.

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 injection pipe 23
Concentrate and solid fuel are continuously blown into the tank 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 converter according to the present invention has a valve seat at the end of the tuyere for injecting concentrate or concentrate and fuel into the melt in the furnace body. A ball is movably provided between the valve seat and a standby position above the valve seat to open and close a passage leading into the furnace body of the tuyere, and the ball opens and closes a passage leading into the furnace body of the tuyere. A guide tube defining an annular air passage along the inner peripheral surface of the passage is inserted into the passage, and a guide tube protruding from the end of the tuyere is inserted between the end of the tuyere and the guide tube. An attachment/detachment mechanism is provided for attaching and detaching the guide tube to the tuyere by engaging and disengaging a locking pin provided therein and an engagement groove of an attachment/detachment portion fixed to the guide tube. A tapered portion whose diameter increases toward the rear end is formed on the inner circumferential surface of the rear end, and an oblique outlet portion cut diagonally is formed at the tip of the guide tube. The tuyere is placed in the passageway of the tuyere with its inclined end face facing downward. In a converter with such a configuration, the concentrate fed through the guide tube is not particularly heated using a burner or the like. Naturally, it is melted by the exothermic reaction of the solution in the furnace. 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.

In addition, since the guide tube can be easily attached and detached, the furnace body can be moved to a specified position to receive the copper produced in the melting process or to transfer the blister copper produced in the furnace to the refining furnace for the next refining process. When rotating the furnace body at an angle of This eliminates the problem of having to secure space, and it becomes possible to minimize the free space that must be secured around the converter in order to avoid interference with surrounding equipment when the converter rotates.

Furthermore, since a tapered part is formed on the inner peripheral surface of the rear end of the guide tube, the diameter of which increases toward the rear end, the concentrate and fuel introduced into the guide tube do not collide with the end surface of the guide tube and are guided smoothly. By being guided inside the tube,
Wear and damage to the guide pipe can be prevented over a long period of time, and there is no obstacle to the injection of concentrate or fuel. In addition, since the guide tube has a sloped outlet at its tip, when inserting the guide tube into the tuyere, the ball placed on the valve seat can be easily pushed away and pushed upward to the standby position. In addition to allowing the guide tube to be smoothly attached to the tuyere, by placing the inclined end face of the guide tube's slanted outlet facing downward in the passage of the tuyere, it is possible to easily attach the guide tube to the tuyere. The concentrate or fuel introduced into the furnace body is easily guided downwards, and therefore can be smoothly contacted and mixed with the solution in the furnace body, and the reaction can be efficiently promoted. can.

[Brief explanation of the drawing]

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 injection pipe 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 pipe, 24...
... Locking pin, 25 ... Monitoring device, 26 ... Air passage, 27 ... Guide tube, 27a ... Taper part, 27
b... Inclined outlet part, 28... Auxiliary pipe for installation,
28a...Communication pipe section, 28b...Bullet material storage section,
28c... Intermediate enlarged diameter part, 28d... Detachable part, 29
...Concentrate supply hose, 30...Handle, 31...
...Putskin, 32...Bullet material, 33...Engagement groove,
33a...Pin introduction part, 33b...Intermediate part, 33
c...Terminal locking part, 35...Transparent partition plate, 3
6... Radiation type thermometer.

Claims (1)

[Claims] 1. For copper smelting, concentrate or concentrate and fuel are injected into the melt in the furnace body through the tuyeres, and the concentrate can be melted in parallel with the oxidation treatment of the slag produced in the melting furnace. In the converter, a valve seat is provided at the end of the tuyere, and a ball is provided between the valve seat and a standby position above the valve seat for opening and closing a passage of the tuyere leading into the furnace body. A guide tube defining an annular air passage along the inner circumferential surface of the passage is inserted into a passage which is movably provided and which leads into the furnace main body of the tuyere, and an end portion of the tuyere. The guide tube is connected to the guide tube by engaging and disengaging a locking pin protruding from the end of the tuyere and an engagement groove of a detachable part fixed to the guide tube. An attachment/detachment mechanism for attachment/detachment to and from the tuyere is provided, and a tapered portion whose diameter increases toward the rear end is formed on the inner circumferential surface of the rear end of the guide tube, and a tapered portion is formed at the tip of the guide tube at an angle. A converter for copper smelting, characterized in that an inclined outlet portion is formed, and the inclined outlet portion of the guide tube is disposed within the passage of the tuyere with its inclined end face facing downward.