JPS6129720Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a blister copper refining furnace, and in particular to its smoke outlet structure.

A blister copper refining furnace is a furnace for processing blister copper produced in a converter in copper pyrometallurgy, mainly through reduction, before sending it to the anode casting process. Since the blister copper produced in the converter contains excess oxygen, it requires reduction, that is, oxygen removal treatment. With advances in converter refining technology, impurities in blister copper produced in converters have been removed to extremely low levels, but in order to further reduce S, As, etc., air is blown in and additives are added prior to reduction. Other processing may also be performed.

A smelting furnace is equipped with a horizontally elongated cylindrical furnace body having the general structure shown in Figure 1, and is positioned at positions appropriate for molten copper charging, reduction (refining), scraping, and tapping operations. It is designed to be tiltable. In FIG. 1, a refining furnace 1 includes a horizontally elongated cylindrical furnace body 3, and the furnace body 3 includes a charging port 5, No. 1 and No. 2 tuyeres 7, 7', tapholes 9, and lances. A hole 11 is formed. Further, as seen in FIG. 1, a burner port 13 is formed at the right end of the furnace body 3, and a smoke exhaust port 15 is formed at the left end thereof. A fuel burner 14 communicates with the burner port 13 .
The furnace body 3 is rotatably supported on a pair of support stands 18 near both ends. Tilting of the furnace is provided by a tilting mechanism 20. The piping and duct system for feeding fuel to the burner 14 is designed to accommodate changes in position due to tilting of the furnace body. Since the present invention relates to the smoke exhaust port 15, a detailed explanation of the tilting mechanism and burner equipment will be omitted.

As shown in the sectional view of FIG. 2, the refining furnace receives, for example, molten copper for two converters with the charging port 5 positioned directly above. The molten copper bath surface normally occupies approximately the center of the furnace cross section. After receiving the molten copper at the position shown in FIG. 2, the refining furnace is tilted to the position shown in FIG. 3, and if necessary undergoes a refining process by blowing air, adding additives, etc., and then undergoes a reduction process. In the reduction process, a reducing agent such as ammonia gas or LPG is injected through the tuyere 7'' (the one on the back side in Figure 1), so the furnace is tilted so that the tuyere 7'' is below the hot water surface. After the reduction process is completed, hot water is tapped through the tap hole.

Smoke generated during furnace operation is exhausted through the smoke outlet 15 described above. The smoke outlet 15 is joined to an eccentric flue 16 as clearly shown in FIG. A peephole 17 is formed in the eccentric flue 16 for viewing the inside of the furnace. Since the eccentric flue 16 is fixed to the smoke exhaust port 15, it tilts together with the furnace. Smoke exhaust port 1
5 and the flue gas discharged through the eccentric flue 16,
Hood 24 to the exhaust gas treatment equipment installed in the factory
and is sucked through the duct 26. food 24
The inlet of the eccentric flue 16 and the outlet of the eccentric flue 16 face each other with a slight gap as shown in the figure in order to allow displacement of the eccentric flue 16 due to tilting of the furnace body.

When operating a refining furnace configured as described above, molten copper that jumps during reduction flows out of the smoke exhaust port 15, flows down the eccentric flue 16, and spills out from the gap with the hood 24. As shown in FIG. 1, a large amount of cast F may accumulate on the lower side of the eccentric flue.

When such overflow of molten copper occurs, (b) This results in a production loss of the molten copper itself.

(b) The eccentric flue is partially or completely blocked by casting, resulting in poor draft.

(c) The life of the eccentric flue will be shortened and frequent replacement will be required.

(d) Since casting removal work must be carried out frequently, a large amount of heavy oil is used for dissolution.

(e) The working environment is dirty and dangerous.

This brings great disadvantages to the refining furnace process.

The object of the present invention is to provide a smoke outlet structure for preventing such overflow of molten copper.

According to the invention, a water cooling jacket is attached to the interface between the smoke outlet and the eccentric flue. The water cooling jacket is installed in the form of a dam to hold back the hot water surface which jumps violently during reduction and other refining processes.

The smoke outlet is generally circular, and as shown in Figure 4, it is made of refractory material 1 such as Mg-Cr high temperature fired brick.
5'. The smoke exhaust port is displaced as the furnace is tilted. Figures 2 and 3 also show smoke exhaust ports. During charging, scraping, and tapping operations, there is almost no jumping on the surface of the molten metal, or even if there is, it is only mild, so it can be considered that the problem of molten copper overflowing does not occur. During the refining work shown in Figure 3, which mainly involves reduction, the surface of the molten metal jumps violently due to gas injection, etc., so there is a high possibility that the jumped molten copper will spill into the eccentric flue through the lower part of the smoke exhaust port. strong. Therefore, it is advisable that the water-cooled jacket provided at the smoke exhaust port be of a form that provides the most effective damming effect on the hot water level during the refining operation as shown in FIG.

The water-cooled jacket dam of the present invention can take several forms, examples of which are shown in Figs. 5-7.

In FIG. 5, smoke outlet 15 is shown as being circularly defined by refractory material 15'. A jacket dam 30 is installed to cover about the lower 1/3 of the smoke exhaust port 15. jacket dam 30
is attached to the metal shell around the smoke exhaust port by bolting or welding. Jacket dam 30 is
It is a water-cooled type with an internal cooling water circulation circuit (the cooling water inlet and outlet and internal passages are omitted). Preferably, it is made of copper.

In FIG. 6, although it is almost the same as FIG. 5, the jacket dam 30 is made of fireproof material 15'.
Cut out a part of the flange and attach the flange weld part 3 to the flange.
It is fitted as shown as 2.

In FIG. 7, a jacket dam 30 in the form of a combination of an annular water cooling jacket and a dam is interposed at the interface between the smoke exhaust port and the eccentric flue. In this case, it is preferable that the annular portion 33 be made of iron and the dam portion 34 be made of copper. The annular part 33 is made of iron to withstand the weight of the eccentric flue since the furnace side and the eccentric flue are bolted together with flanges, and the dam part 34 is made of copper to increase the water cooling effect. Cooling water passages are formed in the annular portion and the dam portion in an appropriate manner.

In either specific example, the upper edge of the dam is parallel to the surface of the molten metal during tilting of the furnace as shown in Figure 3, in order to produce the maximum damming effect during the refining process (Figure 3), where hot water jumps are intense, as described above. It is set to be. The upper edge of the dam shall cover the lower part of the smoke exhaust port as much as possible without interfering with the flow of smoke exhaust.
Generally, it is best to set it 1/2 to 1/4 below the smoke exhaust port. In addition, in order to prevent molten copper from overflowing without interfering with the flow of smoke exhaust, the upper part of the smoke exhaust port has a wider opening area than the lower part, as shown in Figure 8 A to C. It is also possible to adopt the shape and attach a jacket dam to the lower part.

As the refining furnace continues to operate, the refractory material around the smoke outlet erodes, making it more likely that molten copper will overflow. Water-cooled jacket dams not only extend the lifespan of refractory materials by cooling adjacent refractory materials, they are also beneficial in that they solidify molten copper that flows into the refractory material even if the refractory material is eroded, thereby preventing it from overflowing downstream. be. Water cooling prevents damage from contact with molten copper.

As described above, the smoke outlet equipped with the water-cooled jacket dam according to the present invention effectively prevents the overflow of molten copper during the operation of the refining furnace, thereby eliminating the above-mentioned obstacles and improving the workability of the refining furnace. be.

[Brief explanation of drawings]

Figure 1 is a plan view showing an overview of the refining furnace, Figure 2 is a sectional view taken along line A-A in Figure 1, and Figure 3 shows the tilting state of the refining furnace during refining, which mainly involves reduction processing. FIG. 4 is a partially sectional front view of the smoke outlet and flue gas conduction system of the refining furnace; FIG. 5 is a front view and central sectional view of the smoke outlet according to the present invention; FIGS. 6 and 7; 8 is another specific example of the present invention, and FIGS. 8A, 8B and 8C are schematic diagrams showing other forms of the smoke outlet shape. 1: Refining furnace, 3: Furnace body, 5: Charging port, 7,
7', 7'': Tuyere, 9: Tap hole, 11: Lance hole, 13: Burner mouth, 14: Burner, 1
5: Smoke exhaust port, 15': Smoke exhaust refractory material, 16: Eccentric flue, 17: Peephole, 18: Support stand, 20: Tilt mechanism, 24: Hood, 26: Duct, 30: Water-cooled jacket dam, 33: Annular part, 34: Dam part.

Claims (1)

[Scope of utility model registration request] A smoke exhaust port structure for a blister copper refining furnace characterized by a water-cooled jacket type dam attached to the smoke exhaust port in the blister copper refining furnace.