JP6918985B2 - Raw material supply equipment, flash smelting furnace and operation method of flash smelting furnace - Google Patents

Description

The present invention relates to a raw material supply device, a flash smelting furnace, and a method for operating the flash smelting furnace.

A flash smelting furnace is a smelting furnace used for smelting non-ferrous metals such as copper and nickel and for matte smelting. A shaft is provided on a reverberatory furnace type settler and reacts with raw materials from the top. It is a furnace that instantly oxidizes and melts by using the heat of oxidation of the raw material by blowing the gas to be used for. In a flash smelting furnace, a device that supplies raw materials and reaction gas into the flash smelting furnace plays an important role in determining the performance of the flash smelting furnace. The performance of this raw material supply device affects the reaction efficiency and reaction progress of the raw material in the reaction shaft, and as a result, affects the processing capacity of the flash smelting furnace and the metal yield. It is desirable that the reaction in the reaction shaft in the flash smelting furnace proceeds quickly and that all the raw materials proceed uniformly at the same extent of reaction. Therefore, it is desirable that the raw material and the reaction gas are uniformly mixed.

In order to improve the mixing of the raw material and the reaction gas, there is known one that swirls the main air supplied from the raw material supply device into the reaction shaft (Patent Document 1). Further, it is known that an oxygen blowing pipe is provided inside a tubular concentrate chute so as to surround a fuel burner, and a guide blade is provided at an opening thereof to supply a swirling flow (Patent Document 2).

Special Table 2010-538162 Japanese Unexamined Patent Publication No. 60-248832

By the way, the region directly below the raw material supply device is a region where the temperature is low and the concentrate reaction is difficult to proceed due to the main ventilation. Patent Document 1 and Patent Document 2 do not positively generate a swirling flow in the region directly below such a raw material supply device, and there is room for improvement.

The present invention has been made in view of the above problems, and an object of the present invention is to positively promote the mixing of the raw material and the reaction gas supplied into the flash smelting furnace to make the reaction uniform.

The raw material supply device of the present invention is a raw material supply device that supplies raw materials into the flash smelting furnace and at least supplies reaction gas that contributes to the reaction of the raw materials into the flash smelting furnace, and is outward in the radial direction. A hollow cone-shaped dispersion cone having a supply hole that opens toward the tip is provided at the tip, and a lance that discharges a dispersion gas that disperses the raw material through the supply hole and a lance that is provided outside the lance to provide the raw material. A drive unit that rotationally drives the raw material flow path to be supplied into the flash smelting furnace, the gas flow path provided outside the raw material flow path to supply the reaction gas into the flash smelting furnace, and the lance. And.

In this case, a vane may be further provided so as to project into the gas flow path. The vane can be installed in a posture in which the second reaction gas is swirled in a direction opposite to the swirling direction of the dispersion gas, which is swirled by the rotational drive of the lance. The lance may be provided with protrusions on the outer peripheral surface of the dispersion cone. A reinforcing portion may be provided on the outer peripheral surface of the dispersion cone.

The flash smelting furnace of the present invention includes the raw material supply device of the present invention.

The method of operating the flash smelting furnace of the present specification is a method of operating a flash smelting furnace that supplies a raw material into the flash smelting furnace and at least supplies a reaction gas that contributes to the reaction of the raw material into the flash smelting furnace. The raw material is supplied into the flash smelting furnace through a raw material flow path provided outside the lance, and the reaction gas is supplied to the flash smelting furnace through a gas flow path provided outside the raw material flow path. Rotates a lance having a hollow conical trapezoidal dispersion cone at the tip, which has a supply hole that opens outward in the radial direction when the reaction gas is supplied to the flash smelting furnace. While driving, the dispersion gas that disperses the raw material is discharged through the supply hole.

The raw material supply device and the flash smelting furnace of the present invention can positively promote the mixing of the raw material supplied into the flash smelting furnace and the reaction gas to make the reaction uniform.

FIG. 1 is a diagram schematically showing a configuration of a flash smelting furnace for copper smelting according to an embodiment. FIG. 2 is an enlarged view of a part of the raw material supply device of the first embodiment. FIG. 3 is an enlarged explanatory view showing the dispersed cone. FIG. 4 is an explanatory diagram schematically showing how the dispersion gas spreads in the normal direction. FIG. 5 is an explanatory diagram schematically showing a state in which the dispersion gas is swirled by the rotation of the lance and the reaction gas is swirled by the vane. FIG. 6 is an explanatory view showing a state in which protrusions are provided on the outer peripheral surface of the dispersion cone.

Hereinafter, the flash smelting furnace according to the embodiment will be described in detail with reference to FIGS. 1 to 6. FIG. 1 is a diagram schematically showing the configuration of a flash smelting furnace 100 for copper smelting according to an embodiment.

(First Embodiment)
As shown in FIG. 1, the flash smelting furnace 100 includes a raw material supply device 1 and a furnace body 2. The raw material supply device 1 is also called a concentrate burner, and is a raw material concentrate (copper concentrate (CuFeS ₂ or the like)), a main blower gas for reaction, an auxiliary gas for reaction, and a gas for dispersion (which also contributes to the reaction). ) Is supplied into the furnace body 2. The furnace body 2 includes a reaction shaft 3, a settler 4, and an uptake 5 in which the concentrate and the reaction gas are mixed. The main blower gas for reaction and the auxiliary gas for reaction are oxygen-enriched air, and the dispersion gas is air or oxygen-enriched air. These reaction gases and dispersion gases disperse the concentrate, simultaneously oxidize it, and separate it into mats and slags at the bottom of the reaction shaft 3.

FIG. 2 is an enlarged view of a part of the raw material supply device 1, and is an explanatory view showing a charging section 10 for charging the raw material, the reaction gas, and the dispersion gas to the reaction shaft 3 side.

The input section 10 of the raw material supply device 1 includes a lance 16, and the lance 16 includes a first passage 11 through which the dispersion gas passes and a fourth passage 14 through which the reaction auxiliary gas as a part of the reaction gas passes. It is formed. The fourth passage 14 is provided in the central portion of the lance 16, and the first passage 11 is provided around the fourth passage 14. Further, the charging section 10 is provided with a second passage 12 as a raw material flow path provided on the outside of the lance 16, more specifically, on the outer circumference of the lance 16. The input section 10 is further provided on the outside of the second passage 12, more specifically on the outer periphery of the second passage 12, and is provided with a third passage 13 through which the main blast gas for reaction as a part of the reaction gas passes. ing. The third passage 13 corresponds to a gas flow path. The third passage 13 is provided on the outside of the second passage 12 by a tubular portion 17b connected to the downstream side of the funnel-shaped portion 17a having the inside as the air chamber 171. The third passage 13 communicates with an air chamber 171 provided above the third passage 13. The second passage 12 and the third passage 13 are in a state of being partitioned by a cylindrical partition wall 21.

The first passage 11 supplies the dispersion gas into the reaction shaft 3. The second passage 12 supplies the concentrate into the reaction shaft 3. The third passage 13 supplies the reaction main blast gas from the air chamber 17 into the reaction shaft 3. Further, the fourth passage 14 supplies the reaction auxiliary gas into the reaction shaft 3.

A hollow cone-shaped dispersion cone 15 is formed at the tip end portion (lower end portion) of the lance 16. A plurality of supply holes 152 for discharging the dispersion gas that has passed through the first passage 11 into the reaction shaft 3 are formed in the lower portion 151 of the side surface of the dispersion cone 15. The supply hole 152 is provided so that the gas discharge direction is the normal direction of the bottom circle of the dispersion cone 15.

The raw material supply device 1 includes a drive unit 30 that rotationally drives the lance 16. A first passage 11 and a fourth passage 14 are formed inside the lance 16. For example, by using a swivel joint, the lance 16 can be rotated, and a dispersion gas or a reaction is formed in these passages. Auxiliary gas is being supplied.

The lance 16 is driven at a rotation speed of approximately 20 rpm to 120 rpm. The rotation speed can be appropriately selected according to the mixing condition of the raw material and the reaction gas.

Referring to FIG. 3, a reinforcing portion 15a1 is provided on the outer peripheral surface 15a of the dispersion cone 15, and more specifically, the outer peripheral surface 15a of the inclined portion of the dispersion cone 15. The reinforcing portion 15a1 is a portion having higher wear resistance than the peripheral portion. A second passage 12 is formed on the outside of the dispersion cone 15, and a raw material is supplied. Therefore, the raw material may collide with the rotating dispersion cone 15, and the dispersion cone 15 may be worn. Therefore, the reinforcing portion 15a1 is provided at a place where it is easily worn. The reinforcing portion 15a1 in the present embodiment is formed by performing hardening overlay, but the configuration of the reinforcing portion 15a1 is not limited to this, and is, for example, a wear-resistant member formed of tungsten carbide or the like. It is also possible to adopt measures such as pasting.

Referring to FIG. 2, the axis AX of the lance 16 is arranged so as to coincide with the vertical direction. When the lance 16 rotates counterclockwise with the axis AX as the rotation axis, for example, as shown by arrow a1 in FIG. 4, the lance 16 is discharged from the supply hole 152 of the dispersion cone 15 provided at the tip thereof. A vector in the tangential direction as shown by arrow a2 is given to the dispersion gas. When the dispersion gas to which the tangential vector is given comes into contact with the raw material supplied from the second passage 12, the raw material is agitated and mixing with the reaction gas supplied through the third passage 13 is promoted, and as a result, the mixture is promoted. , The reaction is homogenized.

Referring to FIG. 5, the raw material supply device 1 of the embodiment includes a vane 22 that is arranged so as to project into the third passage 13. The vane 22 is installed on the inner peripheral wall surface 17b1 of the tubular portion 17b. The vane 22 is attached to the inner peripheral wall surface 17b1 of the tubular portion 17b via the shaft member 23 so as to have an angle larger than 0 ° with respect to the direction along the axis AX direction. Specifically, the vane 22 has a direction (arrow b1) facing the turning direction (arrow a2 direction) of the dispersion gas that swirls the reaction gas passing through the third passage 13 when the lance 16 is rotationally driven. It is installed in a posture that turns in the direction). By causing the dispersion gas and the reaction gas to collide with each other in this way, the stirring and mixing action can be strengthened and the mixed state can be further improved. Although the vane 22 of the present embodiment is a fixed vane, a movable vane can also be adopted. By adopting a movable vane, the swirling state of the reaction gas can be controlled, so the swirling state of the reaction gas can be changed according to the mixed state of the raw material and the reaction gas, and the reaction gas effectively reacts with the raw material. The mixing of the gas can be promoted and the reaction can be homogenized. The swirling direction of the reaction gas passing through the third passage 13 and the swirling direction of the dispersion gas may be the same, but the swirling direction of the reaction gas and the swirling direction of the dispersion gas are opposite directions. However, it is more preferable from the viewpoint of promoting mixing of the raw material and the reaction gas.

Referring to FIG. 6, the lance 16 is provided with protrusions 15b on the outer peripheral surface of the dispersion cone 15. A plurality of protrusions 15b are provided, and each of the protrusions 15b is arranged on the outer peripheral surface of the dispersion cone 15 along the longitudinal direction thereof. The protrusions 15b provided on the outer peripheral surface of the lance 16 driven to rotate act like blades, and can obtain the effect of dispersing the raw materials in the horizontal direction. Further, since the flow of the raw material itself is swirled, the mixing of the raw material and the reaction gas is promoted, and the reaction can be made uniform. The protrusions may be quadrangular protrusions or hemispherical protrusions obtained by dividing a sphere in half, and the protrusions may be arranged in a zigzag pattern.

As described above, according to the raw material supply device 1 of the present embodiment, it is possible to positively promote the mixing of the raw material supplied into the flash smelting furnace 100 and the reaction gas to make the reaction uniform.

The embodiments described above are examples of preferred embodiments of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

1 Raw material supply device 2 Furnace 3 Reaction shaft 10 Input part 11 1st passage 12 2nd passage 13 3rd passage 14 4th passage 16 Lance 17a Funnel-shaped part 17b Cylindrical part 17b1 Inner peripheral wall surface 22 vane 100 Flash smelting furnace

Claims (7)

A raw material supply device that supplies raw materials into a flash smelting furnace and at least supplies reaction gas that contributes to the reaction of the raw materials into the flash smelting furnace.
A lance that is provided with a hollow cone-shaped dispersion cone having a supply hole that opens outward in the radial direction at the tip and discharges a dispersion gas that disperses the raw material through the supply hole.
A raw material flow path provided outside the lance and supplying the raw material into the flash smelting furnace,
A gas flow path provided outside the raw material flow path and supplying the reaction gas into the flash smelting furnace,
A drive unit that rotationally drives the lance,
Raw material supply device equipped with. The raw material supply device according to claim 1, further comprising a vane that is arranged so as to project into the gas flow path. The raw material supply device according to claim 2, wherein the vane is installed in a posture in which the reaction gas is swirled in a direction opposite to the swirling direction of the dispersion gas, which is swirled by rotationally driving the lance. The raw material supply device according to any one of claims 1 to 3, wherein the lance is provided with protrusions on the outer peripheral surface of the dispersion cone. The raw material supply device according to any one of claims 1 to 4, wherein a reinforcing portion is provided on the outer peripheral surface of the dispersion cone. A flash smelting furnace provided with the raw material supply device according to any one of claims 1 to 5. It is a method of operating a flash smelting furnace that supplies a raw material into the flash smelting furnace and at least supplies a reaction gas that contributes to the reaction of the raw material into the flash smelting furnace.
While supplying the raw material into the flash smelting furnace through a raw material flow path provided outside the lance, the reaction gas is supplied to the flash smelting furnace through a gas flow path provided outside the raw material flow path. Have a process,
When the reaction gas is supplied to the flash smelting furnace, a lance having a hollow cone-shaped dispersion cone having a supply hole opened outward in the radial direction at the tip thereof is rotationally driven through the supply hole. A method for operating a flash smelting furnace that discharges a dispersion gas that disperses the raw materials.

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