JPH05126471A - Breaking method for tuyere for converter - Google Patents

Abstract

PURPOSE:To obtain the breaking method of a tuyere, effected efficiently in time until the next charge is charged after discharging molten body from a converter and capable of reducing the mechanical damage of a tuyere brick due to the breaking work. CONSTITUTION:The breaking work of a tuyere 7 is effected by a method wherein a tuyere breaking machine 3 equipped with breaking rods 8, whose outer diameters are smaller than the inner diameters of the tuyeres 7 and the diameters of the rear parts of the rods are enlarged than the fore parts of the same, at the fore side with respect to the advancing direction of the tuyere breaking machine 3, is used. According to this method, a necessary time for the breaking work can be shortened remarkably, breaking efficiency can be improved and the mechanical damage of a tuyere brick can be reduced remarkably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of reducing mechanical wear of tuyere bricks in a short period of time during breakage of tuyere of a converter in non-ferrous smelting such as copper or nickel smelting and breaking it. The present invention relates to a method for breaking tuyere of a non-ferrous smelting converter.

[0002]

2. Description of the Related Art In general, a horizontal cylinder type horizontal converter called a pierce-smith type converter is used for blowing copper or copper. On the side wall of this converter, dozens of tuyere are provided in a row. From this tuyere, pressurized air is blown into the melt in the furnace to oxidize iron and sulfur for blowing. Due to the cold air blown from the tuyere, deposits are formed on the inner end portion of the tuyere tube that comes into contact with the solution, thereby obstructing ventilation. Therefore, in order to remove the deposits, a tuyere breaker equipped with a plurality of breaker rods in parallel as shown in FIG. 1 is moved along the tuyere outside the converter to move the breaker rod into the tuyere pipe. It is performed to reciprocate to break through.

That is, the converter 1 has tires provided at both ends thereof, and is supported on a receiving roller (not shown) so as to be tiltable. Then, the tuyere breaker 3 is the converter 1
Pair of parallel rails 4 and thrust rails 5 provided on a work seat provided in parallel with the converter 1 in front of the tuyere row of
The rack 6 installed on the work table in parallel with these
And a pinion gear (not shown) provided on the lower side of the tuyere breaker 3 meshes with each other so that the tuyere breaker 3 can move to an arbitrary position in a direction parallel to the converter 1. Further, a plurality of breaker rods 8 having the same outer diameter (four in FIG. 1) having an outer diameter slightly smaller than the inner diameter of the tuyere 7 are attached, and an air cylinder 9 is configured to reciprocate in and out of the tuyere 7. ing.

The tuyere breaking work using such a tuyere breaking machine is mainly performed during a blowing operation with respect to a tuyere tube having an inner diameter of usually 40 to 50 mm and an outer diameter smaller than the inner diameter by 10 to 18 mm. There is a method of using the breaker rod of No. 2 and a method of using a breaker rod having an outer diameter 5 to 8 mm smaller than the inner diameter of the tuyere when the blowing operation after discharging the copper etc. is not performed. ..

Of these, when the tuyere is opened after blowing, for example, Cu ₂ Fe ₂ O ₄ and Cu, which are difficult to remove, are formed around the tuyere of the converter after the melt such as blister copper is discharged.
In addition to this, CuFe ₂ O ₄ , Fe ₃ O _{4 and the} like are formed and attached in a lump form. In order to reduce the tuyere pressure loss in the next cycle and to secure a predetermined air flow, the breakthrough work to remove these is more than that in the breakthrough work during blowing of the deposits around the tuyere or in the tuyere. It is necessary to remove the tuyere bricks more and more, and the tuyere brick wears out as the number of times the converter is used increases. Is required. Therefore, in the breaking work after blowing, a method of mounting one breaking bar on the tuyere breaking machine to break all the converter tuyeres, or a breaking bar having an outer diameter smaller than that of a normal breaking bar is used. Break through to open a guide hole,
Then, a method of sequentially exchanging with a cleaving rod having a larger outer diameter and cleaving to a predetermined diameter is performed.

[0006]

However, in the method of breaking all tuyere with one breaking rod, since there is a large resistance due to the adhered matter, it is often not possible to break it by one breaking operation, and conversely, 1 with multiple breakthrough rods attached
The breakthrough force per book becomes weaker, which takes more time. Further, in this breaking operation, there is a problem that the tuyere has a large striking force, which causes mechanical damage to the tuyere brick. The method of gradually increasing the outer diameter of the breaker rod and replacing it with new one each time is to reduce mechanical damage to the tuyere bricks or to facilitate the breaker work. There is a problem that the time required for work increases in proportion to the increase in the number of rods, and in recent high-load operations, the time from discharging the melt of the converter to charging the river is limited. However, there is also a problem that the increase of this time due to the breakthrough work puts pressure on the river processing capacity of the converter.

According to the present invention, the tuyere breaking work can be performed in a timely manner until the molten material such as blister copper is discharged from the non-ferrous smelting converter and the river is charged next. It is an object of the present invention to provide a tuyere breaking method that can reduce damage to a tuyere brick.

[0008]

[Means for Solving the Problems] The inventors of the present invention have conducted researches to solve the above problems and achieve the above objects, and have attached a plurality of break-out rods having different outer diameters which are successively increased in outer diameter. The present invention has been completed by finding that the purpose can be achieved by using a tuyere breaker. That is, the present invention is directed to a tuyere breaker equipped with a reciprocable breaker bar on a bogie that is movable on a work seat along a tuyere provided in a row on a furnace wall of a non-ferrous smelting converter. In the tuyere breaking method carried out by using, after discharging the melt from the non-ferrous smelting converter, until the next charging of the river, of the breaking bar on the front side with respect to the traveling direction of the carriage. Breaking method of tuyere using a tuyere breaker equipped with multiple breaker rods with smaller outer diameter and larger outer diameter of breaker rod on the rear side. Is.

As for the number of the breaking rods to be mounted on the tuyere breaking machine used in the present invention, it is preferable to mount two or more breaking rods having different outer diameters within the range of the advancing direction of the tuyere breaking machine. It is preferable that the outer diameter of the front striking rod is reduced, the outer diameter of the rear striking rod is gradually increased, and the rods are mounted adjacent to each other at intervals corresponding to the tuyere installation intervals.

[0010]

In the method of the present invention, if attention is paid to the breaking of the same tuyere, a part of the lump deposits in or around the tuyere is removed by the first breaking rod having a small outer diameter. After the guide hole is formed, the punching holes formed by the punching rods having the larger outer diameters are successively increased in size, and the punching holes on the rearmost side form the punching holes having a predetermined diameter. Therefore, since the deposits in the tuyere or around the tuyere are gradually removed, the number of cases in which the same tuyere is repeatedly opened, which cannot be avoided by the conventional method, is reduced, and the time required for opening the tuyere is reduced. Less and less damage to tuyere bricks.

[0011]

EXAMPLES Next, examples of the present invention will be described. Example In a copper smelting converter with 56 tuyeres having an inner diameter of 4.2 m, a length of 11.9 m, and an inner diameter of 42.9 mm, the tuyer bricks were replaced, and then 200 cycles of smelting were performed to break the tuyeres. In the state where it became difficult to discharge the blister copper and then to insert the river, the outer diameter was 11 mm larger than the tuyere inner diameter.
One small breaker rod was installed on the front side in the traveling direction of the tuyere breaker, and one breaker bar with an outer diameter of 5 mm smaller than the inner diameter of the tuyere was installed on the rear side adjacent to the tuyere at equal intervals. Using the tuyere breaker, first the outermost tuyere has an outer diameter of 11
mm Use a breaker rod with a smaller diameter to break the guide hole, then move to the next tuyere, and break the guide hole into the second tuyere with the breaker rod with the smaller outer diameter. The first tuyere in which the guide hole was previously broken was performed with the larger breaking rod. This operation was moved one tuyere at a time to perform breakthrough work on all tuyere, and this was performed for 10 cycles.

The time required for this work is 4 minutes,
The tuyere tube and the deposits around it are sufficiently removed, and
Visual inspection inside the furnace confirmed that the tuyere brick inside the furnace was less damaged. Comparative Example 1 Using a tuyere breaker equipped with one breaker rod whose outer diameter was 5 mm smaller than the inner diameter of the tuyere, the tuyere breakage of the converter was performed in the same manner as in Example 1. The total tuyere breakthrough time was 7 minutes. Comparative Example 2 With respect to a converter tuyere similar to that in Example 1, first, all tuyere was broken using a tuyere breaker equipped with a breaker rod having an outer diameter 11 mm smaller than the inner diameter of the tuyere, and then the breaker rod. Was replaced with a breaker rod having an outer diameter smaller by 5 mm than the inner diameter of the tuyere to break all tuyere. It took a total of 8 minutes to perform the two breaking operations.

As described above, according to the method of the present invention, the time required for the punching work can be shortened to 3/5 as compared with the method of Comparative Example 1, and the required time is 1/2 as compared with the method of Comparative Example 2. It has been confirmed that it can be shortened to.

[0014]

INDUSTRIAL APPLICABILITY The present invention uses a tuyere breaker in which a breaker rod having an outer diameter smaller than the inner diameter of the tuyere to a breaker rod having a larger outer diameter are sequentially mounted from the front side in the traveling direction of the tuyere breaker. Since the breakthrough is made, the breakthrough can be performed smoothly and efficiently,
It is possible to reduce the time required for opening the tuyere, and further, it is possible to reduce the mechanical wear of the tuyere brick due to the opening of the tuyere.

[Brief description of drawings]

FIG. 1 is a plan view showing a conventional example of a tuyere breaker.

[Explanation of symbols]

 1 converter 3 tuyere breaker 7 tuyere 8 breaker rod 9 air cylinder

Claims (1)

[Claims] 1. A tuyere breaker equipped with a breaker bar capable of reciprocating a carriage that is movable on a work seat along a tuyere provided in a row on a furnace wall of a non-ferrous smelting converter. In the tuyere breaking method that is performed using, after discharging the melt from the non-ferrous smelting converter, until the next loading of the river, outside the breaking bar on the front side with respect to the traveling direction of the carriage. Featuring a tuyere breaker equipped with multiple breaker rods with a smaller diameter and a progressively larger outer diameter of the breaker rod on the rear side. How to break your mouth.