JP3144622B2 - Metal material melting furnace and melting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a melting furnace and dissolution method to obtain a melt for casting by dissolving copper strip, in particular, electrostatic
The present invention relates to a melting furnace and a melting method in which a PS converter for obtaining a molten metal for anode casting by re-melting a copper piece having a purity required for casting such as an anode plate after melting is converted.

[0002]

2. Description of the Related Art As is well known, PS converters do not use fuel because they utilize the heat of oxidation of sulfides, and thus there is no arrangement for introducing fuel into the PS converter. The molten metal from the PS converter is guided to a refining furnace, where impurities are removed by oxidizing and scouring, and then reduced with natural gas, ammonia, etc. to increase the purity to 99.8%, and then used in an electrode plate ( (Anode plate). This anode plate is electrolytically refined using the seed plate as a cathode. The anode plate of a predetermined shape is dissolved in the electrolytic solution in the electrolytic purification step, and the weight percentage of the anode mass after electrolysis with respect to the anode mass before electrolysis is
Usually, it is 15 to 20%.

[0003] Cathode copper (Cu 99.99%, electrolytic copper) is commercially available as it is, but it is melted in a refined copper reverberatory furnace, impurities such as S are removed, the oxygen content is adjusted, and cast into an appropriate mold. It is marketed as rod copper and mold copper for electric wire production. On the other hand, the anode plate after electrolysis is still blister copper having a Cu purity of 99.8%, but these are usually used as coolants for relaxing excessive heat of oxidation generated during blowing in a PS converter. It is put into the converter.

[0004]

In the above-mentioned prior art, in a series of anode plate manufacturing equipment from the flash furnace to the casting equipment, the recast anode generated during the repair of the flash furnace cannot be processed. A separate melting furnace and casting equipment were needed. Therefore, equipment costs, personnel costs, management costs, and the like are extra, which is uneconomical.

[0005] On the other hand, the demand for copper material varies greatly depending on the social situation at the time, but copper production facilities are constructed a little more so as to be able to cope with an increase in demand. Therefore, when demand decreases, idle facilities are generated, and effective utilization of these facilities is required.

[0006] Further, when a melting furnace and a casting facility for recasting are provided, these can be smaller in size than a series of anode plate manufacturing facilities, and therefore, usually only one piece is constructed. However, these melting furnaces and casting facilities for recasting have a drawback that they become idle facilities except during the repair of the flash smelting furnace.

[0007] The present invention has been made in view of the above-mentioned problems of the prior art, and uses a PS converter in an existing metal material production facility, and thus minimizes new capital investment and minimizes capital investment. Anode plate after electrolysis by personnel and management
It is an object of the present invention to provide a melting furnace and a melting method in which a PS converter for obtaining a molten metal for anode casting by melting a copper piece having a purity required for equal casting again is used.

[0008]

SUMMARY OF THE INVENTION The present invention provides an anolyte after electrolysis.
A metal material melting furnace for re-melting a copper piece having the purity required for casting such as a metal plate to obtain a molten metal for anode casting, and an inlet for charging the copper piece; Using a PS converter having a plurality of tuyeres in the rotation axis direction of the furnace body,
A flame injected into the furnace body by a part of the plurality of tuyeres mounted combustion burner with separate from the air supply source, while the rotation axis direction on both sides of the tuyere of the tuyere wearing the combustion burner combustion Bas
The present invention provides a melting furnace for a metal material, wherein the melting furnace is used as a secondary air inlet when using a furnace.

According to a second aspect of the present invention, in the metal material melting furnace according to the first aspect, a chute for charging a copper piece is provided adjacent to an inlet of the PS converter, and a chute is charged from the inlet. was then copper piece and abutment, characterized in that the deflecting plate is scattered by dispersing the copper pieces to the furnace body is provided.

[0010] The invention described in claim 3 is the invention according to claim 1 or 2.
In the metal material melting furnace described in the above, the tuyere equipped with a combustion burner is provided at predetermined intervals, at least two tuyeres on both sides in the rotation axis direction are formed as secondary air blowing ports. I do.

According to a fourth aspect of the present invention, in the melting furnace for a metal material according to any one of the first to third aspects, the pressure of heavy oil injected from a combustion burner at the center of the furnace body is reduced. The pressure of heavy oil injected from the combustion burners on both outer sides is made larger to extend the length of the flame from the combustion burner at that portion.

According to a fifth aspect of the present invention, there is provided a method for melting a metal material, wherein a PS converter used for refining copper is used as a melting furnace for recasting an anode .

According to a sixth aspect of the present invention, in the method for melting a metal material according to the fifth aspect, a part of the tuyere of the PS converter is separated from an air supply source and the combustion burner is detachable.
At least a combustion burner is installed.
The tuyere on both sides in the rotation axis direction of the tuyere is used as a secondary air blowing port.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a melting furnace and a melting method of a metal material according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a central cross-sectional view of one embodiment of a melting furnace for a metal material according to the present invention, and FIG. 2 is a horizontal cross-sectional view schematically showing a position of a tuyere of the melting furnace of FIG. It is.

In the illustrated melting furnace 1 according to the present invention, a copper piece having a purity of 99.8%, which is an anode plate after electrolysis, is melted again to form a molten metal for casting on an anode plate for electrolytic refining. This is a melting furnace in which a PS converter in a series of anode plate manufacturing facilities from a flash furnace to a casting facility is diverted.

The melting furnace 1 has a cylindrical furnace body 10 having an inlet 12 for feeding copper pieces and a plurality of tuyeres 14 in the direction of the rotation axis, and a copper furnace provided adjacent to the inlet 12. A chute 20 for charging pieces, and the furnace body 10 is connected to the converter center C
And a roller support device 30 rotatably supported around the roller. Since the PS converter itself is conventionally well known, a detailed description thereof will be omitted here, and only a configuration related to a design change made when diverting to the melting furnace 1 will be described.

As best shown in FIG. 3, a conventional tuyere 14 comprises a tuyere tube 14a penetrating a magnesia or chrome-magnesia refractory brick 10a and a shell 10b, and a tuyere tube 14a. And a branch pipe 14c flanged to the mounting member 14b for fixing an end on the outer skin 10b side to the outer skin 10b. A blind plug 14d is screwed into one branch of the branch pipe 14c and closed, and a duct 40 for feeding air or oxygen-enriched air through a flexible hose 42 to the other pipeline. Are connected.

In the illustrated embodiment, a total of 48 tuyeres 14 are provided in the axial direction of the furnace body 10 (see FIG. 3). A feature of the present invention is that these 48 tuyeres 14 are divided into approximately seven sets, and the center tuyeres 14 of each of the five central sets are set.
Next, as shown in FIG. 4, a heavy oil burner 18 is mounted. The mounting of the heavy oil burner 18 is performed by the mounting member 14.
b, the heavy oil burner 18 is inserted into the tuyere tube 14a, and the special adapter 1 is inserted.
This is performed by fixing at 4e. At the same time, the end on the duct 40 side of the flexible hose 42 connected to the detached branch pipe 14c is removed from the duct 40, and the blind plug 14d is screwed into the duct 40 and closed.

Each heavy oil burner 18 is connected to a pressurized heavy oil supply source 19 via a predetermined pressure adjusting device, for example, a regulator 19a. Usually, the copper piece is placed in the furnace 1
0 is introduced into the furnace body 10 from an inlet 12 provided substantially at the center. Therefore, the copper pieces are distributed such that the central portion of the furnace body 10 becomes a mountain and decreases toward both ends. In this case, in order to efficiently dissolve the copper pieces, it is preferable that the supply of heavy oil to the central portion of the furnace body 10 be larger than that of the end portion.
Specifically, the regulator 19a is adjusted so that high-pressure heavy oil is supplied to the heavy oil burner 18 on the center side and low-pressure heavy oil is supplied to the heavy oil burners 18 on both ends. Alternatively, even if the interval of installation of the heavy oil burners 18 on the center side of the furnace body 10 is shorter than the both sides of the furnace body 10, the copper pieces crested at the center can be efficiently melted.

In the preferred embodiment shown in FIG. 1, the inlet 12 is fitted with a flanged cylindrical liner 20 made of refractory material, and the liner 20 is provided with a chute 21 for charging copper pieces. ing. When copper pieces are loaded by board charge using an overhead crane, the copper pieces fall down this chute 21 and are dispersed and discharged into the converter 10.
As described above, since the copper pieces are relatively uniformly dispersed and charged into the furnace body 10, the copper pieces can be charged without adjusting the pressure of the heavy oil to each heavy oil burner 18 or precisely setting the interval between the heavy oil burners 18. This has the advantage that the removed copper pieces can be efficiently dissolved.

In the PS converter, SO2 generated during operation is guided to a boiler together with waste gas through a duct 13 and used for recovering sulfuric acid. For this reason, the opening 13 a for mat insertion provided in the duct 13 is closed by the front hood 15 that can be opened and closed during operation. When the PS converter is diverted according to the present invention, the copper pieces are heated by the heavy oil injected from the heavy oil burner 18, but since the SO 2 is not contained in the exhaust gas, the copper pieces are usually used without using the duct 13. It is discharged through the cover suction duct 17a.
Inside the front hood 15, it is preferable to provide an openable and closable inner cover 22 for preventing exhaust gas from flowing into the duct 13 and preventing heat from escaping from this portion, thereby reducing consumption of heavy oil. Can be reduced.

Next, an operation method of melting the anode plate after electrolysis using the melting furnace 1 will be described.

Usually, 3 to 5 PS converters are installed in a series of anode plate manufacturing facilities from a flash furnace to a casting facility. One of the furnaces is diverted to a melting furnace for metallic materials according to the present invention.

The inner cover 22, the outer cover 17, and the front hood 15 are opened, and the anode plate after the electrolysis is loaded from above by board charging using an overhead crane. that time,
The anode plate slides down the chute 21 and is uniformly dispersed in the furnace body 10. An anode plate of about 3 tons is charged in a few minutes, the degree of dispersion in the furnace body 10 is checked, and an anode plate of about 3 tons is further charged in a few minutes.

After the anode plate of a total of 6 tons is charged, the outer cover 17 is closed, and the inner cover 22 and the front hood 15 are closed.
Is closed to a predetermined position to prevent exhaust gas from flowing into the duct 13 and to be sucked into the outer cover suction duct 17a. While pumping heavy oil to the heavy oil burner 18,
Air is injected from the tuyeres 14 on both sides to melt the anode plate. In about 54 to 55 minutes, all anode plates are dissolved, but if there is undissolved oxygen-enriched air is introduced.
If such an operation is performed for 23 hours per day, the monthly output is 4
The total amount of the anode plate after the electrolysis, which is said to be 000 tons, can be processed in the smelting furnace from one PS converter.

[0027]

According to the present invention, a PS converter having an inlet for charging copper pieces and a plurality of tuyeres in the rotation axis direction of the furnace body is used, and a part of the plurality of tuyeres is separated from an air supply source. Along with installing a combustion burner and injecting a flame into the furnace body, on the other hand, at least the tuyere on both sides in the rotation axis direction of the tuyere equipped with the combustion burner was used as a secondary air blowing port when using the combustion burner , By minimizing new capital investment and with minimum manpower and management, copper pieces that already have the required purity, such as anode plates after electrolysis , are redissolved and anodized.
The present invention has an effect that a melting furnace and a melting method for obtaining a molten metal for metal casting are provided.

This makes it possible to use idle facilities in the PS converter effectively when they occur, or to repair them when a melting furnace and casting facility for recasting are separately constructed. For example, there is an advantage that the PS converter can be used effectively.

[Brief description of the drawings]

FIG. 1 is a central sectional view of one embodiment of a melting furnace for metal materials according to the present invention.

FIG. 2 is a horizontal cross-sectional view schematically showing a position of a tuyere of the melting furnace of FIG.

FIG. 3 is an enlarged cross-sectional view around the tuyere of FIG.

4 is an enlarged sectional view of a state in which a heavy oil burner is mounted on the tuyere of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Melting furnace 10 Furnace body 10a Refractory brick 10b Skin 12 Inlet 13 Duct 14 Tuyere 14a Tuyere pipe, 14b Mounting member, 14c Branch pipe 14d Blind plug, 14e Adapter 15 Front hood 18 Fuel oil burner 19 Fuel oil supply 19a Regulator Reference Signs List 20 chute 20a deflection plate 30 roller support device

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-256833 (JP, A) JP-A-6-50671 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F27B 1/16 C22B 9/16 C22B 15/06 F27B 1/20

Claims (6)

(57) [Claims] 1. Dissolution of a metal material for re-dissolving a copper piece having a purity required for casting such as an anode plate after electrolysis to obtain a molten metal for anode casting. a furnace, using a PS converter having a plurality of tuyeres in the direction of the rotation axis of the inlet and furnace to inject copper strip, a portion of the plurality of tuyeres
Separated from the air supply source and fitted with a combustion burner, the flame was injected into the furnace. On the other hand, the tuyeres on the both sides in the rotation axis direction of the tuyere equipped with the combustion burner blow secondary air during use of the combustion burner. A melting furnace for metallic materials, which is used as a mouth. With wherein providing the chute to inject copper strip adjacent to the inlet of the PS converter, and copper piece and abutment inserted from said inlet deflection is scattered by dispersing the copper pieces to the furnace body The melting furnace of a metal material according to claim 1, wherein a plate is provided. 3. A tuyere equipped with a combustion burner is provided at predetermined intervals, and at least two tuyeres on both sides in the rotation axis direction are formed as secondary air blowing ports. 3. The melting furnace for a metal material according to 2. 4. The pressure of heavy oil injected from a combustion burner on the center side of the furnace body is set to be higher than the pressure of heavy oil injected from combustion burners on both outer sides of the furnace body, so that the flame from the combustion burner at that portion is reduced. The melting furnace of a metal material according to any one of claims 1 to 3, wherein the length is increased. 5. A PS converter for use in refining of copper anode
A method for melting a metal material, wherein the method is used as a melting furnace for recasting a metal. 6. A tuyere of a part of a PS converter is supplied from an air supply source.
Used for the installation of a combustion burner with separate combustion Bas
The method according to claim 5, wherein the tuyeres provided on both sides of the tuyere in the rotation axis direction are used as secondary air blowing ports.