WO2019139078A1

WO2019139078A1 - Raw material supply device, flash furnace, and operation method of flash furnace

Info

Publication number: WO2019139078A1
Application number: PCT/JP2019/000522
Authority: WO
Inventors: 本村竜也; 佐野浩行
Original assignee: パンパシフィック・カッパー株式会社
Priority date: 2018-01-12
Filing date: 2019-01-10
Publication date: 2019-07-18
Also published as: CN111512108A; JPWO2019139078A1; CN111512108B

Abstract

This raw material supply device supplies a raw material into a flash furnace, and at least supplies into the flash furnace a reaction gas that contributes to the reaction of the raw material, and is provided with: a raw material flow path which is provided outside of a lance and which supplies the raw material into the flash furnace; a gas flow path which is provided outside of the raw material flow path and which supplies the reaction gas into the flash furnace; and a movable vane which is arranged protruding into the gas flow path.

Description

Raw material supply apparatus, flash furnace and operation method of flash furnace

The present invention relates to a raw material supply apparatus, a self-smelting furnace, and a method of operating a self-smelting furnace.

The flash smelting furnace is a smelting furnace used for smelting smelting of nonferrous metals such as copper and nickel, and mat processing smelting, and a shaft is provided on the setter of the reflection furnace type, and the raw material and the reaction are reacted It is a furnace that uses the oxidation heat of the raw material by blowing in the gas to be used, and performs oxidation and melting instantaneously. In the flash smelting furnace, an apparatus for supplying raw materials and reaction gases into the furnace plays an important role in determining the performance of the flash smelting furnace. The performance of the raw material supply apparatus influences the reaction efficiency and the reaction progress degree of the raw material in the reaction shaft, and as a result, affects the processing capacity and metal recovery of the flash smelting furnace. It is desirable that the reaction in the reaction shaft in the flash smelting furnace proceed promptly and uniformly with the same degree of progress of the reaction. For this reason, it is desirable that the raw material and the reaction gas be uniformly mixed.

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

Japanese Patent Publication No. 2010-538162 Japanese Patent Application Laid-Open No. 60-248832

By the way, the area immediately below the raw material supply device is a low temperature due to the main air flow, and is an area where the concentrate reaction is difficult to proceed. Patent Document 1 and Patent Document 2 do not actively generate a swirling flow in the region immediately 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 thereof is to actively promote the mixing of the raw material and the reaction gas supplied into the self-melting furnace to make the reaction uniform.

The raw material supply apparatus according to the present invention is a raw material supply apparatus that supplies a raw material into a self-melting furnace and at least a reaction gas that contributes to the reaction of the raw material into the self-melting furnace. A raw material flow path for supplying the raw material into the flash smelting furnace; a gas flow path provided outside the raw material flow path for supplying the reaction gas into the flash smelting furnace; And a movable vane disposed to project into the passage.

In this case, the movable vane may change its posture in accordance with the gas flow rate per unit time passing through the gas flow path. The movable vane may be set to have a larger angle with respect to the direction along the axial direction of the gas flow passage as the gas flow rate per unit time passing through the gas flow passage increases. Furthermore, the movable vane may change its posture in accordance with the state of the raw material supplied into the flash smelting furnace through the raw material flow path.

The gas flow passage may include an outer flow passage and an inner flow passage, and the movable vane may be disposed at least in one of the outer flow passage and the inner flow passage.

Furthermore, another raw material supply apparatus according to the present invention is a raw material supply apparatus that supplies a raw material into the self-melting furnace and at least supplies a reaction gas that contributes to the reaction of the raw material into the self-melting furnace. It is provided on the outer side of the lance, is connected to the raw material flow path for supplying the raw material into the self-smelting furnace, and downstream of the funnel-like air chamber, and is provided on the outer side of the raw material flow path by a cylindrical portion. A gas flow path for supplying a reaction gas into the flash smelting furnace, and a vane disposed so as to protrude into the gas flow path. In this case, the vane may be a movable vane.

The self-melting furnace of the present invention includes the raw material supply device of the present invention.

The method of operating a flash smelting furnace according to the present specification is a method of operating a flash smelting furnace which supplies a raw material into the self-melting furnace and at least supplies a reaction gas contributing to the reaction of the raw material into the self-melting furnace. And supplying the raw material into the flash smelting furnace through a raw material flow path provided outside the lance, and supplying the reaction gas to the self-smelting furnace through a gas flow path provided outside the raw material flow path And supplying the reaction gas to the flash smelting furnace, adjusting the attitude of the movable vanes disposed so as to protrude into the gas flow path.

The raw material supply apparatus and the self-melting furnace according to the present invention are supplied into the self-melting furnace by adjusting the attitude of the movable vanes so as to form an appropriate swirling flow according to the physical properties of the raw material and the flow rate of the reaction gas. By actively promoting the mixing of the raw material and the reaction gas, it is possible to make the reaction uniform.

FIG. 1 is a view schematically showing the configuration of a flash smelting furnace for copper smelting according to the embodiment. FIG. 2: is the figure which expanded a part of raw material supply apparatus of 1st Embodiment. FIG. 3 is a cross-sectional view of the funnel-shaped portion and the tubular portion. FIG. 4 is an explanatory view showing an angle with respect to a direction along the axial direction of the gas passage of the movable vane. FIG. 5 is an explanatory view showing a drive portion of the movable vane. 6 (A-1) and 6 (A-2) are explanatory views schematically showing a state in which the angle with respect to the direction along the axial direction of the gas passage of the movable vane is 0 °, and FIG. 1-1 is a perspective view, and FIG. 6 (A- 2) is a view from above of the raw material supply device. 6 (B-1) and 6 (B-2) are explanatory views schematically showing a state in which the angle with respect to the direction along the axial direction of the gas flow path of the movable vane is 45 °, and FIG. 1-1 is a perspective view, and FIG. 6 (B- 2) is a view from above the raw material supply device. 6 (C-1) and 6 (C-2) are explanatory views schematically showing a state in which the angle with respect to the direction along the axial direction of the gas flow path of the movable vane is 60 °, and FIG. 1-1 is a perspective view, and FIG. 6 (C- 2) is a view from above of the raw material supply device. FIG. 7 (A) is an explanatory view schematically showing the swirling flow and the reaction frame in a state in which the reaction gas is small, and FIG. 7 (B) is a view of the swirling flow and the reaction frame in a state in which the reaction gas is large It is explanatory drawing which shows typically. FIG. 8A is an explanatory view showing a state in which the variable vanes are provided in the inner flow passage in the second embodiment, and FIG. 8B is a state in which the variable vanes are provided in the outer flow passage in the second embodiment. FIG. FIG. 9 is an explanatory view showing a drive portion of a variable vane provided in the inner flow passage.

Hereinafter, the flash smelting furnace according to the embodiment will be described in detail based on FIGS. 1 to 9. FIG. 1: is a figure which shows roughly the structure of the self-melting furnace 100 for copper smelting which concerns on embodiment.

First Embodiment
As shown in FIG. 1, the self-melting furnace 100 includes a raw material supply device 1 and a furnace body 2. The raw material supply apparatus 1 is also called a concentrate burner, and is a raw material concentrate (copper concentrate (such as CuFeS ₂ )), a reaction main blast gas, a reaction auxiliary gas, and a dispersing gas (also contributes to the reaction ) Is supplied into the furnace body 2. The furnace body 2 includes a reaction shaft 3, a setter 4, and an uptake 5 in which concentrate and reaction gas are mixed. The reaction main blowing gas and the reaction auxiliary gas are oxygen-enriched air, and the dispersing gas is air or oxygen-enriched air. The reaction gas and the dispersing gas disperse and concentrate the concentrate at the same time and separate into a mat and a slag at the bottom of the reaction shaft 3. The sulfur concentration in the copper concentrate is 20 mass% to 40 mass%. In the present specification, “high S concentration” is in the range of 34 mass% to 40 mass%, and “low S concentration” is in the range from 20 mass% to 25 mass%.

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

The input unit 10 of the raw material supply apparatus 1 includes a lance 16 in which a first passage 11 through which a dispersing gas passes and a fourth passage 14 through which a reaction auxiliary gas as a part of a reaction gas passes It is formed. The fourth passage 14 is provided at the central portion of the lance 16, and the first passage 11 is provided around the fourth passage 14. Further, the input unit 10 is provided with a second passage 12 as a material flow channel provided on the outside of the lance 16, more specifically, on the outer periphery of the lance 16. The input unit 10 is further provided on the outer side of the second passage 12, more specifically on the outer periphery of the second passage 12, and includes a third passage 13 through which the main reaction gas for reaction as a part of the reaction gas passes. ing. The third passage 13 corresponds to a gas passage. The third passage 13 is provided on the outer side of the second flow passage 12 by a cylindrical portion 17 b continuously provided on the downstream side of the funnel-shaped portion 17 a whose inside is an air chamber 171. The third passage 13 communicates with an air chamber 171 provided thereabove. The second passage 12 and the third passage 13 are separated by the cylindrical partition wall 21.

The first passage 11 supplies the dispersing gas into the reaction shaft 3. The second passage 12 feeds the concentrate into the reaction shaft 3. The third passage 13 supplies the reaction main blowing 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 conical truncated cone-shaped dispersion cone 15 is formed at the tip (lower end) of the lance 16. A plurality of supply holes 152 for discharging the gas for dispersion, which has passed through the first passage 11, into the reaction shaft 3 are formed in the side lower portion 151 of the dispersion cone 15. The supply holes 152 are provided such 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 movable vane 22 disposed so as to protrude into the third passage 13. Referring to FIG. 3, the movable vanes 22 are installed on the inner circumferential wall surface 17 b 1 of the cylindrical portion 17 b. Referring to FIG. 4, the variable vane 22 can change the angle θ with respect to the direction along the direction of the axis AX of the third passage 13, via the shaft member 23 on the inner circumferential wall surface 17 b 1 of the cylindrical portion 17 b. It is attached. Referring to FIG. 5, the shaft member 23 provided with the movable vanes 22 at one end side penetrates the cylindrical portion 17 b, and a gear 24 c is provided at the other end side. The gear 24 c is included in the drive portion 24 of the movable vane 22. The drive unit 24 includes a motor 24 a and a gear 24 b mounted on the motor shaft. The gear 24 b rotates the shaft member 23 by meshing with the gear 24 c to change the attitude of the movable vane 22. The movable vanes 22 of the present embodiment have a curved shape. Therefore, the angle θ is an angle formed by the tangent on the convex side surface 22 a and the line segment parallel to the axis AX and passing through the shaft member 23.

Here, an example of the dimension of the movable vane 22 will be described. The length L of the cylindrical portion 17b in the present embodiment is approximately 650 mm, and the inner diameter is approximately 690 mm. The length of the movable vane 22 is set to about 100 mm or less in consideration of changing the posture so as not to contact the curved inner peripheral wall surface 17b1 of the cylindrical portion 17b having such dimensions. Further, the width W of the movable vane 22 is set to be approximately 50% or more and less than 90% of the distance between the inner circumferential wall surface 17b1 of the cylindrical portion 17b and the partition wall 21. The reason why the distance is approximately 50% or more of the distance between the inner circumferential wall surface 17b1 and the partition wall 21 is to appropriately impart a swirling component to the reaction gas passing through the third passage 13. On the other hand, the reason why the distance between the inner peripheral wall surface 17b1 and the partition wall 21 is less than about 90% is because the movable vane 22 is not in contact with the inner peripheral wall surface 17b1 or the partition wall 21 when changing the posture of the movable vane 22. It is.

A plurality of movable vanes 22 are provided. Although ten are provided in this embodiment, the number is not limited to this and can be changed suitably.

The movable vanes 22 are attached to the inner peripheral wall surface 17b1 of the cylindrical portion 17b, but it is considered that the operation may be affected by the casting attachment during operation if the movable vane 22 is too close to the lower end edge 17b2 of the cylindrical portion 17b. . Therefore, it is installed at a certain distance from the lower end edge 17b2. On the other hand, it is conceivable that the swirling flow of the reaction gas disappears if it is too far from the lower end edge 17b2. Therefore, it is desirable that the movable vane 22 be installed so that the shaft member 23 is positioned at a position of 100 mm or more and less than 300 mm from the lower end edge 17b2 of the cylindrical portion 17b having a length of about 650 mm.

Although the plurality of movable vanes 22 of the present embodiment are provided such that the distances from the lower end edge 17b2 of the cylindrical portion 17b are the same, the plurality of movable vanes 22 are changed by changing the distance from the lower end edge 17b2. May be installed. For example, the movable vanes 22 may be installed in multiple stages so that the distance from the lower end edge 17b2 is different.

Next, the operation of the movable vane 22 will be described with reference to FIGS. 6 and 7. The movable vanes 22 change the posture in accordance with the gas flow rate per unit time passing through the third passage 13. More specifically, the movable vane 22 is set to have a larger angle with respect to the direction along the axis AX of the third passage 13 as the gas flow rate per unit time passing through the third passage 13 increases.

That is, according to the operation method of the self-melting furnace 100 of the present embodiment, the raw material is supplied into the self-melting furnace 100 through the second passage 12 provided outside the lance 16 and provided outside the second passage 12. A step of supplying a reaction gas to the self-smelting furnace 100 through the third passage 13 is included. In addition, when the reaction gas is supplied to the self-melting furnace 100, there is a step of adjusting the attitude of the movable vanes 22 disposed so as to protrude into the third passage 13.

Referring to FIGS. 6A-1 and 6A-2, a state where the angle θ with respect to the direction along the direction of the axis AX of the third passage 13 of the movable vane 22 is adjusted to 0 ° is shown. . This is an operation mode in which the gas flow rate per unit time passing through the third passage 13 is relatively small. For example, low load operation or low S concentration raw material is used. The gas flow rate per unit time passing through the third passage 13 is changed according to the operating conditions, but when the gas flow rate per unit time is small, the raw material and the reaction can be used without swirling the reaction gas. A mixed state of gas can be realized. In such a case, the angle θ with respect to the direction along the axis AX direction of the third passage 13 of the movable vane 22 is set to 0 °. When the swirl component is not applied to the reaction gas, the swirl flow f1 of the reaction gas and the reaction frame f2 do not spread as shown in FIG. 10A.

Referring to FIGS. 6 (B-1) and 6 (B-2), a state in which the angle θ with respect to the direction along the direction of the axis AX of the third passage 13 of the movable vane 22 is adjusted to 45 ° is shown. . This is an operation mode in a state where the gas flow rate per unit time passing through the third passage 13 is larger than the state shown in FIGS. 6 (A-1) and 6 (A-2). For example, high load operation or high S concentration raw material is used. As the angle θ of the movable vane 22 with respect to the direction along the direction of the axis AX of the third passage 13 increases, a swirling component is imparted to the reaction gas passing through the third passage 13. Thereby, the mixing of the raw material and the reaction gas in the reaction shaft 3 is promoted. When the swirl component is added to the reaction gas, the swirl flow f1 of the reaction gas and the reaction frame f2 spread so as to approach the wall portion of the reaction shaft 3 as shown in FIG. 10 (B). As a result, the residence time of the raw material in the reaction shaft 3 becomes long, and a state in which the reaction is easily completed in the reaction shaft 3 is easily formed.

Referring to FIGS. 6C-1 and 6C-2, a state in which the angle θ with respect to the direction along the direction of the axis AX of the third passage 13 of the movable vane 22 is adjusted to 60 ° is shown. . This is an operation mode in a state where the gas flow rate per unit time passing through the third passage 13 is larger than the state shown in FIG. 6 (B-1) and FIG. 6 (B-2). For example, it is a case where it is a further high load operation, or uses a further high S concentration raw material. As the angle θ with respect to the direction along the direction of the axis AX of the third passage 13 of the movable vane 22 increases, a larger swirl component is imparted to the reaction gas passing through the third passage 13. Thereby, the mixing of the raw material and the reaction gas in the reaction shaft 3 is promoted. When the swirl component is applied to the reaction gas, the swirl flow f1 of the reaction gas and the reaction frame f2 further spread so as to approach the wall portion of the reaction shaft 3. As a result, the residence time of the raw material in the reaction shaft 3 is further lengthened, and a state in which the reaction is easily completed in the reaction shaft 3 is easily formed.

The shape of the facing surface 22b of the movable vane 22 with the inner peripheral wall surface 17b1 is the same as the inner peripheral wall surface 17b1 when the angle θ with respect to the direction along the axis AX direction of the third passage 13 of the movable vane 22 is 60 °. It has a curved shape that allows close contact. Thereby, when the angle θ with respect to the direction along the axis AX direction of the third passage 13 of the movable vane 22 is 60 °, the facing surface 22b is in close contact with the inner peripheral wall surface 17b1, and the movable vane 22 and the inner peripheral wall surface 17b1 The gap between and disappears. As a result, it is possible to more effectively impart the swirling component to the reaction gas. When it is desired to increase the angle θ and to efficiently impart a swirl component to the reaction gas, it is effective to bring the opposing surface 22b into close contact with the inner peripheral wall surface 17b1 when setting the angle θ large.

In the present embodiment, as the gas flow rate per unit time passing through the third passage 13 increases, the angle θ is set larger. However, if the angle θ is set too large, the reaction frame f2 may approach the wall of the reaction shaft 3 too much and damage the wall of the reaction shaft 3. Therefore, it is desirable to set a predetermined upper limit value for the angle θ. Also, during operation, if the reaction frame f2 is too wide, it is possible to reduce the angle θ and take measures to weaken the turning component.

According to the raw material supply apparatus 1 of the present embodiment, the mixing of the raw material and the reaction gas supplied into the self-melting furnace 100 can be actively promoted to make the reaction uniform. In addition, excessive heat load on the reaction shaft wall surface can be suppressed.

According to the raw material supply apparatus 1 of the present embodiment, the amount of reaction gas changes with changes in the raw material conditions and the operating conditions, so the angle of the movable vanes 22 is maintained in order to maintain an appropriate reaction state for each condition. Adjust θ. Further, as a response to the difference in reactivity due to the raw material composition and particle size, in the operation with a large ratio of difficultly reactive raw materials, the spread of the swirling flow is made large by adjusting the movable vane 22 to a larger angle side. Do. As a result, the residence time of the raw material in the reaction shaft 3 can be extended, and conditions in which the reaction is easily completed can be formed in the shaft. That is, the movable vanes 22 can be changed in posture according to the state of the raw material supplied to the flash smelting furnace 100 through the second passage 12. In addition, it is possible to adjust to an appropriate turning pattern so that an excessive heat load is not applied to the wall of the reaction shaft 3.

For example, if the heat load on the wall of the reaction shaft 3 is too high, or if there is a high point locally, the angle θ of the movable vane 22 is adjusted to the 0 degree side. The heat load on the wall can be reduced.

In addition, although the shape of the movable vane 22 in this embodiment is a curved shape, it may be a smooth shape. Moreover, although the movable vane 22 is used in this embodiment, it may replace with the movable vane 22 and may employ | adopt the fixed vane which does not change the attitude | position.

Second Embodiment
Next, a second embodiment will be described with reference to FIGS. 8 and 9. In the second embodiment, the cylindrical dividing wall 25 is installed in the third passage 13, and the third passage 13 is divided into the outer flow passage 13a and the inner flow passage 13b. And as shown to FIG. 8 (A), the movable vane 26 is installed in inner peripheral wall surface 25as of the dividing wall 25. As shown in FIG. The movable vanes 26 are common to the movable vanes 22 and thus the detailed description thereof is omitted.

Referring to FIG. 9, the movable vanes 26 are attached to the inner circumferential wall surface 25 a of the dividing wall 25 via the shaft member 27. The shaft member 27 provided with the movable vane 26 on one end side passes through the dividing wall 25 and the cylindrical portion 17b, and a gear 28c is provided on the other end side. The gear 28 c is included in the drive portion 28 of the movable vane 26. The drive unit 28 includes a motor 28 a and a gear 28 b attached to the motor shaft. The gear 28 b rotates with the shaft member 27 by meshing with the gear 28 c to change the attitude of the movable vane 26. A driving method via a chain or the like may be employed other than the driving by the illustrated gear.

In addition, when it is a form provided with the outer side flow path 13a and the inner side flow path 13b, the movable vane should just be installed in at least one of the outer side flow path 13a and the inner side flow path 13b. In the case where the movable vanes 22 are installed in the outer flow passage 13a, the movable vanes 22 may be installed in the inner peripheral wall surface 17b1 of the cylindrical portion 17b as shown in FIG. 9 (B). The installation of the movable vanes 22 is the same as in the first embodiment, and thus the detailed description thereof is omitted.

Even in such a second embodiment, similarly to the first embodiment, the mixing of the raw material and reaction gas supplied into the self-melting furnace 100 is actively promoted to make the reaction uniform. it can.

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

DESCRIPTION OF SYMBOLS 1 Raw material supply apparatus 2 Furnace body 3 Reaction shaft 10 Input part 11 1st passage 12 2nd passage 13 3rd passage 14 4th passage 14a Lower end part 16 Lance 17a Funnel-like part 17b Tubular part 17b1 Inner

peripheral wall surface

22, 26 Movable Vane 25 divided wall 25a inner peripheral wall surface 100 self-melting furnace

Claims

A raw material supply apparatus for supplying a raw material into a self-melting furnace and at least supplying a reaction gas that contributes to the reaction of the raw material into the self-melting furnace,
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, for supplying the reaction gas into the self-melting furnace;
Movable vanes arranged to project into the gas flow path,
Raw material supply device equipped with
The raw material supply device according to claim 1, wherein the movable vane changes an attitude according to a gas flow rate per unit time passing through the gas flow path.
The raw material supply apparatus according to claim 1 or 2, wherein the movable vane is set to have a larger angle with respect to the direction along the axial direction of the gas flow passage as the gas flow rate per unit time passing through the gas flow passage increases. .
The raw material supply apparatus according to any one of claims 1 to 3, wherein the movable vane changes the posture in accordance with the state of the raw material supplied into the flash smelting furnace through the raw material flow path.
The gas flow path includes an outer flow path and an inner flow path, and the movable vane is at least disposed in one of the outer flow path and the inner flow path. The raw material supply apparatus as described in.
A raw material supply apparatus for supplying a raw material into a self-melting furnace and at least supplying a reaction gas that contributes to the reaction of the raw material into the self-melting furnace,
A raw material flow path provided outside the lance and supplying the raw material into the flash smelting furnace;
A gas passage provided continuously on the downstream side of a funnel-shaped air chamber and provided outside the raw material passage by a cylindrical portion, and supplying the reaction gas into the self-melting furnace;
A vane disposed so as to protrude into the gas flow path,
Raw material supply device equipped with
The said vane is a movable vane, The raw material supply apparatus of Claim 6.
A self-melting furnace provided with the raw material supply apparatus according to any one of claims 1 to 7.
A method of operating a flash melting furnace, comprising: supplying a raw material into the flash smelting furnace and supplying at least a reaction gas contributing to the reaction of the raw material into the flash smelting furnace,
The reaction gas is supplied to the self-melting furnace through the gas flow path provided outside the raw material flow path while the raw material is supplied into the self-melting furnace through the raw material flow path provided outside the lance. Have a process,
A method of operating a flash melting furnace, wherein the attitude of a movable vane arranged to be protruded from the gas flow path is adjusted when the reaction gas is supplied to the flash melting furnace.