JPS6075533A - Method for operating oxidation and reduction furnace - Google Patents

Abstract

PURPOSE:To improve the work efficiency of oxidation and reduction of molten metal in an oxidation and reduction furnace by attaching plural tuyeres of different kinds to the furnace so that they are arranged under the surface of the bath and by carrying out each of oxidation, slag discharge and reduction stages with tuyeres suitable for the stage after plugging other tuyeres. CONSTITUTION:Tuyere groups each consisting of a tuyere 1 of a large diameter and a tuyere 2 of a small diameter are attached to plural positions of a furnace for oxidizing and reducing molten metal such as a refining furnace 3 so that they are arranged under the surface of the bath. In an oxidation stage, the tuyeres 2 are plugged with plugging members 12, and a large volume of air is blown from the tuyeres 1. In a reduction stage, the tuyeres 1 are plugged with plugging members 11, and heavy oil or the like is blown from the tuyeres 2 to remove oxygen.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for operating a furnace for total redox of metal solutions.

Furnaces that oxidize and reduce metal solutions, such as copper refining furnaces, have tuyeres for oxidation and reduction that blow oxidizing and reducing agents into the molten steel. Removes sulfur by oxidation.

Furthermore, impurities in the blister copper are removed by blowing in a solvent or the like. The next reduction step involves removing the blown oxygen from the same tuyeres, including a mixture of fuel and air.

However, in the conventional tuyeres, as mentioned above, air and fuel are mixed and blown into the tuyere to create a reducing atmosphere, so the diameter cannot be made very large due to its structure. Therefore, when the content of sulfur in molten copper is large.

Conventional tuyeres have problems such as the inability to blow in large amounts of air.

In addition, since the waste is sent to the Wazen discharge port by utilizing the waste,
Tuyere locations are also very limited.

This invention was made in view of the above points, and
In other words, this invention allows a large amount of oxidizing agent to be injected during the oxidation process, and also enables smooth switching of the oxidizing agent/reducing agent supply when moving from the oxidation process to the reduction process and then from the reduction process to the next batch of oxidation process. The purpose of this invention is to provide a method for operating a redox furnace that can be carried out.

Therefore, in order to achieve all of these objectives, the operating method of the redox furnace of the present invention is such that when a plurality of various blades are placed in a furnace for redoxing a metal solution so as to be under the bath surface at the same time, When carrying out all processes such as bush discharge, reduction, etc., the tuyere suitable for each process should be selected and used, and the other tuyere should be completely closed.

The present invention will be fully explained below with reference to an embodiment shown in the drawings.

Figure 1 is a schematic diagram of a refining furnace used to fully explain this invention, Figures 2 (G) and (I3) are sectional views of the tuyere portion of the refining furnace used to fully explain the oxidation process, and Figure 3 (A) and (B) are cross-sectional views of the tuyere portion of the refining furnace for explaining the entire reduction process.

For example, the refining furnace as a furnace for redoxing a metal solution shown in Fig. 1 is of a horizontal tilting type, and consists of a tuyere 1 with a large diameter of 50 mm and 2 tuyeres with a small diameter of, for example, 15 column φ. There are many tuyere groups.

The inner circumferential surface of the furnace shell 3 of this refining furnace is
The wall shown in r+) is lined with refractory bricks 4.

The tuyere tubes 5, 6 of the large and small diameter tuyeres 1, 2 preferably have a melting point higher than the melting temperature of the melt in the refining furnace. each inner open end 7,
8 reaches the inner circumferential surface i/i: of the refractory brick 4, and each outer charging end 9, 10 projects outward from the furnace shell 3 area.

On the other hand, 1.1 and 12 shown in No. 1N are the panel pipes 5.
These are large-diameter and small-diameter blocking members used to block 6. In detail, the large-diameter blocking member 11 is
As shown in FIG. 13, there is a tuyere inner tube 13 made of iron, for example, similar to the tuyere tube 5, and a monolithic refractory (for example, castable) 1 filled in the tuyere inner tube 13.
4 and 1-. A gap (for example, 2.5
If necessary, it is coated with a lubricating material such as water glass or graphite to facilitate loading or unloading into the tube 5.

Further, the small-diameter blocking member 12 has the same configuration as the blocking member 11, as shown in FIG. 2 (G),
The tuyere inner tube 15 is filled with a monolithic refractory 16, and the outer periphery of the tuyere inner tube 15 is coated with a lubricating material as required.

First, the oxidation process will be explained while the refining furnace is in full operation.

In the oxidation process, as shown in FIG. 2(A), a small-diameter blocking member 12 with a 10-cut outer charging end is charged into the small-diameter blade 1 and 20-window tube 6 to form a tuyere tube. 6 is closed, and the large-diameter tuyere pipe 5 with 10 large-diameter slats 5 is left open as shown in FIG. 2 (13) VC. Then, a large amount of air is completely blown through the siding pipe 5, for example, to melt the liquid (such as molten steel) in the refining furnace.
The sulfur contained in it is removed by total peroxidation. When the oxidation treatment is completed, the blocking member 12 is pushed and dropped into the refining furnace or pulled out and the small-diameter siding tube 6 is inserted into the refining furnace.
to open.

Next, in the reduction process, contrary to the above, as shown in Fig. 3 (5)
As shown in FIG. 3, the tuyere tube 6 of the small diameter tuyere 2 is left open, and the outer charging end 9. r, the large-diameter blocking member 11 is fully charged and the siding pipe 5 is blocked. Then, one tuyere tube with 6 holes is fully injected with heavy oil.

Let's remove oxygen. When this reduction process is completed (-1) and the operation moves on to the next batch and the oxidation process starts again, the tuyere pipe 6 may be closed and the tuyere pipe 5 may be completely opened.

By operating in the oxidation and reduction steps as described above, a large amount of oxidizing agent can be injected during the oxidation step, and
When moving from the oxidation process to the trowel discharge to the reduction process, and further from the reduction process to the next batch of oxidation process, the supply of oxidizing agent and reducing agent can be smoothly switched.

Incidentally, in this embodiment, a copper refining furnace was used as the furnace for performing total oxidation and reduction of metal bodies, but it goes without saying that the method of the present invention is not limited to this and can be applied to various furnaces.

As explained above, this invention (according to C, oxidation.

When performing processes such as slow discharge and reduction, the tuyere suitable for each process is selected and the other tuyeres are completely closed, so a large amount of oxidant can be injected during the oxidation process, and
When moving from the oxidation step to the reduction step and further from the reduction step to the next batch of oxidation steps, the supply of oxidizing agent and reducing agent can be switched completely smoothly, which has the effect of completely improving the redox workability of the solution.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a refining furnace used to fully explain this invention, Figures 2 (5) and (I3) are cross-sectional views of the tuyere of the refining furnace used to fully explain the oxidation process, and Figure 3 (5)03) is a sectional view of the tuyere portion of the refining furnace for explaining the entire reduction process. 1...Large diameter tuyere, 2...Small diameter tuyere, 11...Large diameter tuyere blocking member, 12...Small diameter tuyere blocking member. Patent applicant Nippon Mining Co., Ltd. Agent Patent attorney Norihiro Nishimura Figure 1

Claims (1)

[Claims] When multiple tuyeres of different types are placed in a furnace for redoxing a metal solution so that they are all under the bath surface at the same time,
A method of operating an oxidation-reduction furnace characterized by selecting and using tuyeres suitable for each process when performing all processes such as oxidation, bush discharge, and reduction, and closing other tuyeres.