JPH0552483A - Refining furnace for nonferrous metal - Google Patents

Abstract

PURPOSE:To elongate the repairing period of a refining furnace by a method wherein other lance holes are formed on a furnace top in addition to lance holes formed at predetermined positions for inserting a lance tube. CONSTITUTION:Lance holes 14a are formed on a furnace top 10 and a lance tube 2A is inserted into a furnace 13 through the lance hole 14a to blow ores A and oxygen B into the furnace. Other lance holes 14b, arranged at positions apart from the lance holes 14a in the direction of the same plane so as to supplement the arrangement of the lance holes 14a, are bored in addition to the lance holes 14a arrayed on the furnace top 10 in predetermined positions for inserting the lance tube 2A. When the part of a hearth 11, which is opposed to the positions of the lance holes 14a, into which the lance tube 2A has been inserted, is damaged by fusing due to the long period operation of the furnace and a through hole P1 is produced on the hearth 11, the lance tube 2A is pulled up from the lance hole 14a and another lance hole 14b, not used yet, is opened by removing a lid 15, then, the lance tube 2B is inserted. According to this method, the operation of the furnace can be continued without progressing the enlargement of the lance hole of the hearth, which is generated previously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-ferrous metal smelting furnace for blowing by using a lance tube inserted from the furnace top.

[0002]

2. Description of the Related Art Conventionally, in the smelting of non-ferrous metals, for example, in a smelting furnace such as a copper smelting furnace or a copper smelting furnace, a so-called lance pipe is inserted into the furnace from the top of the smelting furnace and blown. Is being done.

The lance tube is a lance inner tube for blowing powdery or granular raw material ore, silica sand, lime, etc. (hereinafter referred to as ore) into a solution, and oxygen-enriched air (hereinafter referred to as oxygen) for promoting blowing. It has a double tube structure that is inserted into the outer tube of the lance for blowing oxygen. Such a lance tube is suspended above the furnace top, and its tip is lowered to near the molten metal surface of the furnace solution, and ore and oxygen are blown at a predetermined pressure and flow rate.

On the other hand, a lance hole for inserting the lance tube was formed at the top of the smelting furnace corresponding to the position where the ore and oxygen should be blown into the solution. The lance holes formed on the furnace top are arranged along the diametrical direction in the vicinity of the center of the circular furnace top in plan view, in the same number as the number of lance tubes required in advance according to the scale of the furnace. It had been.

[0005]

By the way, when the ore and oxygen are blown into the solution in the furnace, it is necessary to control the injection amount per hour according to the depth of the solution.
That is, this is that determined penetration reach of the blowing amount per hour into the solution of the raw materials, reduces the smelting efficiency blowing amount is insufficient, conversely, to reach excessive blow the up hearth . When the lance tube is blown into the melt from above, it is especially important to adjust the instantaneous ore supply of ore. During normal operation, it can be controlled within the range where the hearth is not dug, but when the lance is replenished or the ore supply tank fails, the lance or the ore supply tank that is in operation must supply the prescribed amount of processing. There are cases where the instantaneous supply amount increases.

When the furnace is used for a long period of time, the hearth portion facing the insertion position of the lance tube is inevitably melted and a perforated state is generated in the hearth portion. Therefore, it was necessary to periodically stop the operation of the furnace and repair the hearth.

Incidentally, the measurement results of the excavated state of the hearth after two years of operation are shown in FIGS. 4 and 5. FIG. 4 is a plan view of the melting loss occurring at the blowing position of the lance. In this case, eight lance pipes are used, and the mutual spacing between the lance pipes is 500 mm in the left-right direction of the drawing. The pitch was 700 mm in the vertical direction. According to this, in the excavation indicated by reference numeral 1-1, the diameter of the bowl shape reaches up to about 600 mm, and such an excavation depth is shown in FIG. To show it, the digging indicated by reference numeral 3 has a diameter of about 43.
Although it was 0 mm, it reached 270 mm in depth.
The brick thickness of the hearth was initially 400 mm.

However, today, a smelting furnace capable of operating for a longer period of time is required due to the problem of labor saving in maintenance and management of equipment. Also, the smelting furnace is a harsh reaction furnace, high-temperature splashes of lance blowing are scattered in the furnace, and the bricks are protected by a water cooling jacket. for that reason,
Even if the lance insertion position was changed by digging the hearth, the jacket could not be changed during heat retention, and there was a demand for a furnace structure that was predicted in advance.

In view of such circumstances, the present invention has been found as a result of studying a means for not concentrating the location where melting damage occurs after observing the state of the hearth earnestly, and its purpose is to The purpose of the present invention is to provide a smelting furnace for non-ferrous metals that can be extended in repair period and can be operated for a long time.

[0010]

In order to solve the above problems, in the smelting furnace of the present invention, a lance tube is inserted from the furnace top into the furnace, and ores and oxygen are supplied to the solution by the lance tube and blown. In the smelting furnace for non-ferrous metal for smelting, another lance hole is formed at the top of the furnace in addition to a lance hole formed at a predetermined position for inserting a lance tube.

[0011]

When the lance tube is inserted into the furnace from the same position on the top of the furnace and ore and oxygen are blown in, the hearth portion facing the insertion position of the lance tube is melted and perforation occurs. In this case, the lance tube is pulled up from the lance hole formed at the predetermined position where the initial lance tube is formed at the top of the furnace, and another unused lance hole is opened to insert the lance tube. The other switched lance holes are formed at positions separated from the originally used lance hole in the plane direction, and if a lance tube is inserted from this lance hole, the hearth of the hearth that was melted earlier is generated. Since the ore and oxygen are blown toward the hearth portion distant from the perforation site, the furnace operation can be continued without advancing the previously generated perforation of the hearth.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

The smelting furnace 1 according to the present invention is constructed of refractory bricks (hereinafter referred to as refractory) protected by a water-cooling jacket, and the whole body has a short-axis cylindrical shape and a loose spherical shape. The furnace top 10 and the hearth 11 are sealed. Exhaust gas containing sulfur oxides and metal fumes generated during blowing is sucked from a flue port 16 provided at one corner of the furnace top 10 using a dust collector (not shown). Further, lance holes 14a, ... Are formed in the furnace top 10, and the lance pipes 2A, ... Are inserted into the furnace 13 through the lance holes 14a ,. And
At the top 10 of the smelting furnace 1, the lance pipe 2
Lance holes 1 arranged at predetermined positions for inserting A, ...
In addition to the lance holes 14a, ..., Other lance holes 14b, .., which are complementary to the lance holes 14a ,. There is.

The lance holes 14a and 14b are shown in FIG.
As shown in FIG. 5, the lance holes 14a and the lance holes 14b are arranged approximately in the diametrical direction of the furnace top 10, and are formed in an alternating manner in each row and in a staggered manner in adjacent rows. That is, the lance holes 14a, ... Are arranged in a gradual arrangement along the diametrical direction in order to enhance the blowing efficiency, while the lance holes 14b ,.
At a position apart from the lance hole 14a on the plane of 0 and with respect to the melt 12 of the smelting furnace 1
, Which is almost the same as that of the lance holes 14a, ... It is preferable that each of these lance holes 14a, 14b, ... Is separated from each other by at least about 500 mm in consideration of the melted state of the hearth 11. Further, the lance holes 14b, ..., In which the lance tube is not initially inserted, have a lid 15 made of a refractory material.
Is inserted, and the lance hole 14b is sealed. In this way, in addition to the lance hole 14a into which the lance tube 2A is inserted, the lance hole 14b is previously formed in the furnace top 10, whereby damage to the hearth 11 can be dealt with.

On the other hand, as shown in FIG. 2, the lance tube 2A inserted into the furnace 13 has an oxygen introduction header 24
The lance outer tube 23 is fixed by the scroll chuck 25 and communicates with the lance outer tube 23, and the lance inner tube 21 is inserted into the outer tube 23 through the oxygen introduction header 24. The oxygen pipes 27, 28 are attached to the outer pipe 23 of the lance.
Oxygen B is supplied through the raw material conduit 26 and the ore A is supplied to the lance inner pipe 21 through the raw material conduit 26 and the inner pipe header 22.

Further, in this embodiment, in addition to the lance pipe 2A, a lance pipe indicated by reference numeral 2B is adjacent to the lance pipe 2A, and another lance hole 14 formed in the furnace top 10 is provided.
It is provided corresponding to b. The lance pipe 2B is used when the raw material pipe 26, the oxygen pipe 27 and the outer pipe 23 are not used.
Is removed and lifted above the furnace 1.

Further, as described earlier, the lance hole 14
The a and 14b are respectively opened in water cooling jackets 18, ... Which collectively form a part of the furnace top 10. The water cooling jacket 18 is a heat exchange device in which a pipe for circulating water is inserted through a metal block containing copper as a main component, and is engaged with a refractory material forming the furnace top 10. As a result, the temperature rise around the lance holes 14a and 14b can be suppressed and the damage to the refractory can be reduced as compared with the case where the lance holes 14a and 14b are directly formed on the furnace top 10.

Next, a lance hole 14 is formed in the furnace top 10 as described above.
The operation of the smelting furnace 1 in which a, ..., And lance holes 14b ,.

Initially, the lance tube 2A has lance holes 14a, ...
Is inserted into the furnace 13 from which the ore A and the oxygen B are blown. However, due to long-term operation, the hearth 11
The portion facing the position of the lance hole 14a into which the lance tube 2A is inserted is melted and the perforation P1 is generated in the hearth 11.
In this case, the lance tube 2A is pulled up from the lance hole 14a and replaced with another lance hole 14b that is not used.
5 is removed, a hole is opened, and the lance tube 2B is inserted. In the lance pipe 2B, the raw material conduit 26 removed from the lance pipe 2A,
An oxygen conduit 27 and a lance outer tube 23 are attached. Since the lance pipes 2B, ... Are provided in advance at the positions corresponding to the lance holes 14b ,,, it is possible to sequentially switch from the lance pipe 2A to the lance pipe 2B while continuing the operation of the smelting furnace 1.

The other switched lance holes 14b, ...
Are formed at positions separated from the originally used lance holes 14a, ..., In the plane direction.
If the lance tube 2B is inserted from b, the lance tube 2B that has been switched from the lance tube 2B to the hole P
Since the ore A and the oxygen B are blown toward the hearth portion separated from No. 1, the smelting furnace 1 can be continuously operated without advancing the perforation state of the perforation P1.

Further, another lance hole 14b, which will be opened later,
, Are arranged complementarily to the originally used lance holes 14a, ..., so that the blowing balance with respect to the total solution 12 is almost the same.
From b, ..., to the solution 12 in the furnace 13 ore A and oxygen B
When blowing, the blowing efficiency of the furnace does not change.

Incidentally, in this embodiment, the hearth 11 by blowing is used.
The number of lance holes 14a and 14b is the same as each other in consideration of the fact that the perforation P1 of each of the lance pipes substantially corresponds to the blowing time and the operation for a longer period of time.
4a and lance holes 14b are formed in an approximately diametrical arrangement of the furnace tops 10 and in an alternating arrangement for each row and in an adjacent row. Lance tubes 2B, ... Corresponding to the lance holes 14b ,. However, the method of arranging these lance holes 14a and 14b may be any arrangement as long as the blowing efficiency is good, and the lance pipe to be installed is used from the beginning without providing the lance pipe 2B corresponding to the other lance holes 14b. The lance tube 2A may be switched so as to be horizontally movable.

[0023]

Since the present invention is constructed as described above, it has the following effects.

(1) When the hearth is damaged by blowing from above the molten metal surface by the lance tube, direct the ore and oxygen injection positions by the lance tube to the hearth part separated from the damaged part. Can be switched to the blow position without stopping the operation of the furnace.

(2) By changing the blowing position as described above, the repair cycle of the hearth can be extended and the smelting furnace can be operated continuously for a long time. Therefore, it is applicable to the continuous smelting method. It becomes possible to construct a large-scale furnace that can operate.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a smelting furnace of the present invention.

FIG. 2 is a cross-sectional view of an essential part showing the relationship between a lance hole and a lance tube formed on the furnace top.

FIG. 3 is a plan view showing an arrangement of lance holes and a cooling device having the lance holes opened.

FIG. 4 is a plan view showing a erosion area of a hearth in a conventional smelting furnace.

FIG. 5 is a side sectional view showing a erosion depth of a hearth in a conventional smelting furnace.

[Explanation of symbols]

 1 Smelting Furnace 2A, 2B Lance Tube 10 Furnace Top 11 Hearth 12 Solution 14a, 14b Lance Hole 15 Lid 18 Cooling Device 21 Lance Inner Tube 23 Lance Outer Tube P1 Drilling

Claims (1)

[Claims] 1. A non-ferrous metal smelting furnace in which a lance tube is inserted into the furnace from the top of the furnace and ores and oxygen are supplied to the solution by the lance tube to perform blowing, and a lance tube is provided at the top of the furnace. A non-ferrous metal smelting furnace characterized in that other lance holes are formed in addition to a row of lance holes formed at predetermined positions for insertion.