JP3968974B2 - Concentrate burner - Google Patents

Description

【００１４】
【発明の効果】
上述の如く本発明によれば、精鉱と反応用ガスとのより均一な混合及び燃焼を可能とし、ヒープの発生の抑制やカラミ中マグネタイトの低減を可能にした精鉱バーナーを提供することが出来る。また、製錬原料の装入量を増大させても良好な酸素効率や脱硫性能が得られる精鉱バーナーを提供することが出来る。
【図面の簡単な説明】
【図１】本発明に係る精鉱バーナーの第１実施例の要部構成図である。
【図２】本発明に係る精鉱バーナーの第２実施例の要部構成図である。
【図３】自熔製錬炉の基本構成の一例を示す概略構成図である。
【図４】従来の精鉱バーナーの要部構成図である。
【符号の説明】
１ 精鉱シユート
２ 反応用ガス送り管
３ バーナーコーン
４ 風速調整器
５ 補助燃料バーナー
６ 分散コーン
７ 孔又はスリット
８ ノズル
１０ 精鉱バーナー[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concentrate burner for feeding a smelting raw material and a reaction gas into a furnace provided in a self-melting smelting furnace.
[0002]
[Prior art]
One smelting furnace that uses sulfide concentrate as a raw material is a self-smelting furnace called a self-smelting furnace. FIG. 3 is a schematic configuration diagram showing an example of a basic configuration of the auto-smelting furnace. The auto-smelting furnace basically has a reaction tower 11 provided with a concentrate burner 10 at the top, and one end connected to the lower part of the reaction tower 11, and a side opening 12 and a side opening 13 on the side. And a flue passage 15 connected to the other end of the settler 14.
[0003]
Conventionally, in a self-melting smelting furnace, a powdered solid sulfide smelting raw material is supplied from a concentrate burner 10 provided at the top of a reaction tower 11 together with a reaction gas such as oxygen-enriched air for reaction. 11 is blown into. In the reaction tower 11, the blown solid sulfide smelting raw material is heated by radiant heat in the furnace wall, the heat of the auxiliary fuel, or the sensible heat of the reaction gas, and instantaneously reacts with the reaction gas to the settler. 14 is stored. Within the setra 14, the melt is divided into calami and river by the specific gravity difference. Then, the calami is discharged from the calami vent 12 and introduced into the electric smelting furnace 16. On the other hand, the rivet is extracted from the evacuation opening 13 in response to a request in the batch process of the converter, which is the next step.
[0004]
Further, the high-temperature exhaust gas generated in the reaction tower 11 is discharged through the settler 14 and the flue path 15 and cooled by the boiler 17. The calami that has entered the electric smelting furnace 16 is heated and maintained by the electric heat energized by the electrode 18, and the hangers suspended in the calami are further settled at the bottom of the furnace, and only the calami that contains a slight amount of copper is removed. It is discharged out of the furnace through the port 19. In this way, the solid sulfide smelting raw material is divided into Karami and Kawa.
[0005]
As shown in FIG. 4, the conventional concentrate burner 10 includes a concentrate 1, a reaction gas feed pipe 2, a burner cone 3, and a fixed or movable wind speed regulator 4. . The concentrate 1 is a tubular member for feeding the smelting raw material, and extends in the vertical direction toward the reaction tower 11 (see FIG. 3). The reaction gas feed pipe 2 is formed so that its diameter decreases as it goes downward from a predetermined position in the pipe. The burner cone 3 is formed in a tubular shape, and its upper end 3a is connected to the lower end 2a of the reaction gas feed pipe, so that the concentrate flow and the reaction gas flow are fed into the reaction tower 11. The wind speed regulator 4 is formed in a shape that narrows the width of the reaction gas flow path formed by the reaction gas feed pipe 2 and the concentrate 1 to a predetermined size. The speed of the reaction gas flow can be determined. An auxiliary fuel burner 5 for raising the temperature of the reaction gas fed through the reaction gas feed pipe 2 extends toward the reaction tower 11 at the center of the concentrate 1.
[0006]
In some cases, the concentrate burner 10 does not include the auxiliary fuel burner 5 when a solid fuel such as pulverized coal is used as the auxiliary fuel. Further, a dispersion cone 6 is provided at the tip of the auxiliary fuel burner 5 at a position where the smelting raw material fed vertically from the concentrate shout 1 collides, and the smelting raw material is entirely inside the burner cone 3. It is made to disperse | distribute uniformly to it and to make it contact with the gas for reaction, and generation | occurrence | production of what is called a heap (lump of unmelted material) is prevented.
[0007]
In such a concentrate burner, when the solid sulfide smelting raw material is charged from the concentrate 1 on the outer periphery of the auxiliary fuel burner 5, the reaction gas feed pipe 2 in which the reaction gas further exists on the outer periphery thereof. More blown. The solid sulfide smelting raw material comes out of the concentrate shute 1 and then comes into contact with the reaction gas flow adjusted to a predetermined speed via the wind speed regulator 4 so that the heat of the auxiliary fuel or the reaction gas is revealed. The reaction proceeds by the temperature rise due to heat or radiant heat from the inner wall of the furnace.
[0008]
[Problems to be solved by the invention]
However, in the conventional concentrate burner 10 described above, since the reaction gas adheres to the inner wall of the burner cone 3 and flows, it is difficult to flow toward the inside of the burner cone 3, and the reaction gas and solid sulfide in the burner cone 3 are difficult to flow. Mixing of smelting raw material (hereinafter referred to as “concentrate”) was not sufficient. As a result, some concentrates near the concentrate flow center fall into the settler 14 unreacted, and a heap is generated, or some concentrates near the concentrate flow outer shell are peroxidized and are unnecessary. Since magnetite was produced, it caused problems such as deterioration of fluidity of calami and deterioration of copper content in calami.
[0009]
The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is concentrate and reaction gas (reaction air, reaction oxygen-enriched air or industrial use). It is to provide a concentrate burner that allows more uniform mixing and combustion with (oxygen).
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a concentrate burner according to the present invention is provided at the top of a reaction tower of a flash smelting furnace, and includes a concentrate chute and a reaction gas feed pipe provided on the outer periphery of the concentrate shout. And a concentrate burner provided with a burner cone whose upper end is connected to the lower end of the reaction gas feed pipe, a plurality of wind speed regulators provided on the outer periphery of the concentrate shout in the reaction gas feed pipe. This is characterized in that a reaction gas such as oxygen-enriched air for reaction or industrial oxygen is fed into the furnace through the blowout hole or slit.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on the illustrated examples. In each embodiment, the same reference numerals are used for substantially the same components as those used in the prior art, and detailed descriptions thereof are omitted.
Example 1
FIG. 1 is a diagram showing a basic configuration of a first embodiment of a concentrate burner 10 according to the present invention. In this embodiment, as is clear from FIG. 3, a plurality of blowing holes or slits 7 are arranged on the bottom surface of the wind speed adjuster 4 at appropriate intervals along the circumferential direction. A part of the reaction gas such as reaction oxygen-enriched air flowing in the feed pipe 2 is blown out from the bottom surface of the wind speed regulator 4 through the blow-out hole or slit 7 and is sent into the furnace. It differs from the conventional concentrate burner.
[0012]
Example 2
FIG. 2 is a diagram showing a basic configuration of a second embodiment of the concentrate burner 10 according to the present invention. In this embodiment, a nozzle 8 connected to the outside of the concentrate burner 10 is provided in the upper part of the wind speed adjuster 4, and industrial oxygen introduced from the outside of the concentrate burner 10 passes through the slit 7. 4 differs from the first embodiment in that it is configured to be blown out from the bottom surface of 4 and fed into the furnace.
[0013]
Since the embodiment of the present invention is configured as described above, the concentrate and the reaction gas are brought into contact and mixing quickly and uniformly in the burner cone 3 to suppress the generation of heap and Reduction of medium magnetite can be achieved. According to the experiment, the magnetite grade and the copper-containing state in the calamis when the oxygen enrichment air for reaction and the oxygen enrichment for industrial use were blown using the concentrate burner of this example were as shown in the table below. It was.

[0014]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a concentrate burner that enables more uniform mixing and combustion of concentrate and reaction gas, and suppresses the generation of heap and reduces magnetite in calami. I can do it. Further, it is possible to provide a concentrate burner that can obtain good oxygen efficiency and desulfurization performance even if the amount of smelting raw material is increased.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a main part configuration diagram of a first embodiment of a concentrate burner according to the present invention.
FIG. 2 is a block diagram of the main part of a second embodiment of the concentrate burner according to the present invention.
FIG. 3 is a schematic configuration diagram showing an example of a basic configuration of a self-melting smelting furnace.
FIG. 4 is a main part configuration diagram of a conventional concentrate burner.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Concentrate 2 Reaction gas feed pipe 3 Burner cone 4 Wind speed regulator 5 Auxiliary fuel burner 6 Dispersion cone 7 Hole or slit 8 Nozzle 10 Concentrate burner

Claims (1)

Provided at the top of the reaction tower of the auto-smelting furnace, the concentrate chute, the reaction gas feed pipe provided on the outer periphery of the concentrate shout, and the upper end connected to the lower end of the reaction gas feed pipe In the concentrate burner equipped with a burner cone, a plurality of blowing holes or slits are provided on the bottom surface of the wind speed regulator provided on the outer periphery of the concentrate in the reaction gas feed pipe, and A concentrate burner characterized in that a reaction gas such as oxygen-enriched air for reaction or industrial oxygen is fed into the furnace.

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