JP2002060859A - Burner for concentrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burner for concentrate by which the dispersion of smelting raw material in a burner cone is promoted so as to be increased in the contacting amount of the smelting raw material with the gas for reaction. SOLUTION: An auxiliary fuel burner 5 is disposed at the center part of a chute 1 for concentrate and also, a concentrate dispersion adjuster 7 is arranged so as to be vertically movable in the auxiliary fuel burner 5. The concentrate dispersion adjuster 7 is vertically moved with a hanging bolt 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concentrate burner provided in a flash smelting furnace for feeding a smelting raw material and a reaction gas into the furnace.

[0002]

2. Description of the Related Art One of smelting furnaces using sulfide concentrate as a raw material is a flash smelting furnace called a flash smelting furnace. FIG. 2 is a schematic configuration diagram showing an example of the basic configuration of the flash smelting furnace. The flash smelting furnace is basically composed of a reaction tower 11 provided with a concentrate burner 10 at the top, a lump outlet 12 and a water outlet 13 connected at one end to the lower portion of the reaction tower 11 and at the side. Is provided, and a flue gas duct 15 connected to the other end of the settler 14.

Conventionally, in a flash smelting furnace, a powdery solid sulfide smelting raw material is provided together with a reaction gas such as oxygen-enriched air for reaction and a concentrate burner 1 provided at the top of a reaction tower 11.
From 0, it is blown into the reaction tower 11. In the reaction tower 11, the injected solid sulfide smelting raw material is heated by radiant heat in the furnace wall, heat of the auxiliary fuel or sensible heat of the reaction gas, and instantly reacts with the reaction gas to settle. Stored at 14. In the settler 14, the melt is divided into Karami and Kawa according to the difference in specific gravity. Then, the lumps are discharged from the lumping hole 12 and introduced into the electric furnace 16. On the other hand, the Kawa is extracted from the Kawa removal port 13 in response to a request in the next process, a batch process of a converter.

[0004] High-temperature exhaust gas generated in the reaction tower 11 is discharged through a settler 14 and a flue gas duct 15 and cooled by a boiler 17. The kalami that has entered the electric furnace 16 is heated and maintained by the electric heat supplied by the electrode 18, and the kava suspended in the kalami further precipitates at the furnace bottom,
Only lint containing a small amount of copper is discharged out of the furnace through the outlet 19. In this way, the solid sulfide smelting raw material is divided into kalami and kava.

As shown in FIG. 3, the conventional concentrate burner 10 comprises a concentrate shot 1, a reaction gas feed pipe 2,
A burner cone 3 and a fixed or movable wind speed adjuster 4 are provided. The concentrate shot 1 is a tubular member for feeding a smelting raw material, and extends vertically toward a reaction tower 11 (see FIG. 1). The reaction gas feed pipe 2 is formed such that its diameter becomes smaller as it goes below a predetermined position in the pipe. The burner cone 3 is formed in a tubular shape, and the upper end 3a is connected to the lower end 2a of the reaction gas feed pipe so that the concentrate stream and the reaction gas stream are fed into the reaction tower 11. The wind speed adjuster 4 is formed in such a shape that the width of the flow path of the reaction gas formed by the reaction gas feed pipe 2 and the concentrate shot 1 is reduced to a predetermined size. Is provided on the outer periphery of the reaction gas, so that the velocity 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 shot 1.

[0006] When using a solid fuel such as pulverized coal as an auxiliary fuel, the concentrate burner 10 may not include the auxiliary fuel burner 5. At the tip of the auxiliary fuel burner 5, a dispersion cone 6 is provided at a position where the smelting raw material sent vertically from the concentrate 1 collides with the smelting raw material. To make it easier to come into contact with the reaction gas, thereby preventing the generation of so-called heaps (lumps of unmelted material).

In such a concentrate burner, when a solid sulfide smelting raw material is charged from the concentrate shot 1 on the outer periphery of the auxiliary fuel burner 5, the reaction gas further reacts on the outer periphery thereof. It is blown from the feed pipe 2. After the solid sulfide smelting raw material exits from the concentrate shot 1, the solid sulfide smelting raw material comes into contact with the reaction gas flow adjusted to a predetermined speed via the wind speed regulator 4, and the heat of the auxiliary fuel or the reaction gas is detected. The reaction proceeds when the temperature is increased by heat or radiant heat from the inner wall of the furnace.

[0008]

However, in the above-mentioned conventional concentrate burner 10, 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. For this reason, of the smelting raw materials discharged into the burner cone 3 from the concentrate shot 1, those flowing outside easily come into contact with the reaction gas, while those flowing inside have few chances to come into contact with the reaction gas. The reaction was difficult to proceed. In particular, when the supply amount of the smelting raw material is increased, this tendency becomes remarkable, the position in the reaction tower at which the desired desulfurization rate is reached is lowered, and the combustion is rapidly performed within a limited range in the lower part of the reaction tower 11 in the vertical direction. Therefore, the heat load on the inner wall brick of the reaction tower 11 increases, and the damage on the inner wall brick of the reaction tower becomes severe. In addition, problems such as deterioration of separability between mat and slag and magnetite trouble due to increase in magnetite concentration in slag also occur.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to promote the dispersion of a smelting raw material in a burner cone, and An object of the present invention is to provide a concentrate burner capable of increasing the amount of contact between a raw material and a reaction gas.

[0010]

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 comprises a concentrate chute and an outer periphery of the concentrate chute. And a burner cone having an upper end connected to the lower end of the reaction gas feed pipe, a fossil fuel burner or an oxygen or oxygen-rich gas at the center of the concentrate chute. The invention is characterized in that a fossilized air supply lance is arranged, and a concentrate dispersion regulator is vertically movable in the fossil fuel burner or the oxygen or oxygen-enriched air supply lance. According to the present invention,
The concentrate dispersion regulator is characterized in that the static pressure in the concentrate chute decreases when the concentrate dispersion regulator is raised. The concentrate burner according to the present invention is characterized in that a concentrate dispersion regulator is fixedly arranged on the fossil fuel burner or the oxygen or oxygen-enriched air supply lance. According to the invention, the concentrate dispersion regulator is characterized as a concentrate dispersion cone.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a main part configuration diagram of an embodiment of a concentrate burner according to the present invention. In the figure, substantially the same members as those described in the related art are denoted by the same reference numerals, and description of those members is omitted. Further, the concentrate burner of this embodiment is installed in a flash smelting furnace as shown in FIG.

In the concentrate burner of this embodiment, FIG.
As shown in FIG. 1, a concentrate dispersion controller 7 configured as a concentrate dispersion cone is fitted in the auxiliary fuel burner 5 so as to be vertically movable, and a suspension bolt connected to the concentrate dispersion controller 7 is provided. By moving up and down 8, the height position can be changed. Usually, this concentrate dispersion controller 7
The ore is arranged so as to be located near the lower end of the ore concentrate 1, and its shape is configured such that the static pressure in the ore concentrate 1 is reduced when the ore dispersion controller 7 is raised. In this embodiment, the auxiliary fuel burner 5 is
It may be configured as a fossil fuel burner or an oxygen or oxygen enriched air supply lance. Further, the concentrate dispersion controller 7 may be configured to be fixed to a predetermined position of the auxiliary fuel burner 5 so that the auxiliary fuel burner 5 can be moved up and down. Note that a plurality of movable or fixed concentrate dispersion controllers 7 may be provided.

In the concentrate burner according to the present embodiment, the smelting raw material is charged from the concentrate shot 1 and the reaction gas is supplied from the reaction gas feed pipe 2 on the outer periphery thereof to the wind speed regulator. The wind speed is adjusted to a predetermined speed through 4 to be sent in, and both are supplied into the reaction tower 11. When the smelting raw material is loaded too much and good combustion of the smelting raw material cannot be obtained, the concentrate dispersion controller 7 is raised to an appropriate position by lifting the hanging bolts 8. as a result,
Dispersion of the smelting raw material in the burner cone 3 is promoted, and good combustion is achieved.

In the above embodiment, the concentrate dispersion controller 7
Is brought to a position where the upper end thereof coincides with the lower end 1a of the concentrate ore 1 and the operation is performed at a concentration of 2300 tons / day of the concentrate concentrate, and the same operation is performed without using the concentrate dispersion controller 7. When the magnetite concentration in the slag and the change in the copper content were examined between the case where the operation was performed under the conditions and the change in the copper content, it was confirmed that both the magnetite concentration and the copper content were reduced as shown in the table below.

[0015]

As described above, according to the present invention, the contact between the smelting raw material and the reaction gas is increased by promoting the dispersion of the smelting raw material in the burner cone, and the smelting raw material and the reaction gas are increased. It is possible to provide a concentrate burner capable of significantly improving the reactivity with urea. In particular, according to the present invention, good desulfurization performance can be obtained even when a large amount of smelting raw material is continuously charged into the concentrate burner, and the magnetite concentration in slag and the copper content in slag can be reduced. It is possible to provide a smelting furnace.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram of an embodiment of a concentrate burner according to the present invention.

FIG. 2 is a schematic configuration diagram showing an example of a basic configuration of a flash smelting furnace.

FIG. 3 is a main part configuration diagram of a conventional concentrate burner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Concentrate shot 2 Reaction gas feed pipe 3 Burner cone 4 Wind speed regulator 5 Auxiliary fuel burner 6 Dispersion cone 7 Concentrate dispersion regulator (concentrate dispersion adjustment cone) 8 Hanging bolt 10 Concentrate burner

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K019 AA09 BA02 BA03 BB02 BB04 BD08 BD09 BD12 CA01 CA02 4K001 AA09 BA06 DA03 FA14 GA04 GB01 GB03 GB11 JA01 4K063 AA03 CA01 CA03 DA14 DA31

Claims (3)

[Claims] 1. A concentrate chute, a reaction gas feed pipe provided on an outer periphery of the concentrate chute, and a lower end of the reaction gas feed pipe provided at a top of a reaction tower of a flash smelting furnace. And a burner cone connected to a fossil fuel burner or an oxygen or oxygen enriched air supply lance at the center of the concentrate chute. A concentrate burner characterized in that a concentrate dispersion regulator is provided in an air supply lance so as to be vertically movable. 2. The concentrate dispersion regulator, wherein the static pressure in the concentrate chute is reduced when the concentrate dispersion regulator is raised. Concentrate burner as described. 3. The concentrate burner according to claim 1, wherein a concentrate dispersion regulator is fixedly disposed on the fossil fuel burner or the oxygen or oxygen-enriched air supply lance.