JP2018063109A - Raw material supply device, raw material supply method, and flash furnace - Google Patents

Abstract

[Problem] To provide uniform concentrate (raw material) to be supplied. A raw material supply apparatus (1) is provided outside a lance (16) through which a reaction gas passes, a second passage (12) through which concentrate (raw material) passes, and the second passage (12). It is equipped with a raw material homogenization mechanism 30 that adjusts the distribution of the concentrate by blowing a gas for homogenizing the raw material toward the concentrate, so that the raw material is made uniform toward the concentrate passing through the second passage 12. By spraying the gas for use, the distribution of concentrate can be made uniform. [Selection] Figure 2

Description

  The present invention relates to a raw material supply apparatus, a raw material supply method, and a flash furnace.

  A flash smelting furnace is a smelting furnace used for smelting of non-ferrous metals such as copper and nickel, and mat processing smelting. It is a furnace that uses the heat of oxidation of the raw material to the maximum by blowing gas and instantaneously performs oxidative melting. In the flash smelting furnace, an apparatus for supplying raw materials and reaction gas into the 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 and metal yield of the flash smelting furnace. It is desirable that the reaction in the reaction shaft in the flash smelting furnace proceeds promptly and all the raw materials proceed uniformly with the same degree of reaction progress. For this reason, it is preferable to supply a raw material to a flash smelting furnace in the state as uniform as possible.

  Recently, in order to supply the raw material in a uniform state to the flash furnace, a technique for supplying the raw material from three or more directions (for example, four directions) is known (see, for example, Patent Document 1). In addition, a technique of providing a partition wall or a collision plate in the raw material supply path has also been proposed (see, for example, Patent Document 2).

JP 2003-160822 A Special table 2013-513727 gazette

  However, the raw material supplied to the flash smelting furnace may be agglomerated without particles being dispersed. As in Patent Document 1, it is possible to homogenize the raw material simply by supplying the raw material from three or more directions. It may be insufficient. Further, due to insufficient homogenization of the raw material, the reaction between the raw material and oxygen becomes non-uniform, and the reaction product may be uneven. Further, as in Patent Document 2, when a partition wall or a collision plate is provided in the raw material supply path, a raw material (for example, copper wire scraps) is caught on the partition wall or the collision plate, the flow of the raw material is hindered, and the raw material is uniform. There is also a risk that conversion will be insufficient.

  The present invention has been made in view of the above problems, and a raw material supply apparatus and a raw material supply method capable of making the supplied raw material uniform, and a flash furnace capable of suppressing unevenness of reaction products. The purpose is to provide.

  The raw material supply device of the present invention is a raw material supply device that supplies a raw material into a flash smelting furnace and supplies a first gas that contributes to a reaction of the raw material into the flash smelting furnace, wherein the first gas is A raw material flow path through which the raw material passes, and an adjusting means for adjusting the distribution of the raw material by blowing a second gas toward the raw material passing through the raw material flow path, provided outside the lance passing through the inside And the adjusting means measures the information related to the distribution of the raw material, and based on the measurement result of the measuring unit, the distribution of the raw material is made uniform in the raw material flow path. And a controller for adjusting the blowing of the second gas.

In this case, the adjusting means has a plurality of pipelines for blowing the second gas toward the raw material, and the control unit is configured to control each of the plurality of pipelines based on the measurement result of the measurement unit. The amount of the second gas blown toward the raw material may be controlled. The adjusting means has a plurality of pipe members in which pipes for blowing the second gas toward the raw material are formed, and the plurality of pipe members are partition walls that form the raw material flow paths. May be provided to be exchangeable.
In this case, the pipe member may be provided so as to be replaceable with respect to a slit formed in a partition wall forming the raw material flow path.
In the raw material supply apparatus of this invention, it is good also as providing the supply part which supplies the said raw material from two directions with respect to the said raw material flow path.

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

  The raw material supply method of the present invention is a raw material supply method for supplying a raw material into a flash smelting furnace, the step of blowing gas into a raw material flow path through which the raw material passes, and the dispersion of the raw material dispersed by blowing the gas A step of measuring information related to the distribution, and a step of adjusting the blowing of the gas so that the distribution of the raw material is uniform in the raw material flow path based on the measurement result in the measuring step; Is included.

  In this case, in the step of blowing the gas, the gas is blown into the raw material flow path from a plurality of directions, and in the adjustment step, the amount of gas blown from the plurality of directions and / or the angle of the blown gas is adjusted. It is good as well.

  The raw material supply apparatus and the raw material supply method of the present invention have the effect that the supplied raw materials can be made uniform. Moreover, the flash smelting furnace of the present invention has an effect that unevenness of reaction products can be suppressed.

It is a figure which shows roughly the structure of the self furnace for copper smelting which concerns on one Embodiment. It is the figure which expanded a part of raw material supply apparatus. Fig.3 (a) is a perspective view which shows a rectification | straightening nozzle, FIG.3 (b) is sectional drawing of a part of division | segmentation block and a partition wall. FIG. 4A is a diagram showing a case where the concentrate is in a non-uniform state in the second passage, and FIG. 4B is a case where the concentrate is in a uniform state in the second passage. FIG. It is a figure which shows the state which divided | segmented the inside of the reaction shaft virtually. Fig. 6 (a) is a graph showing an example of the transition of the amount of heat removed from the cooling water (Mcal / h) when the concentrate is supplied non-uniformly, and Fig. 6 (b) is a diagram where the concentrate is supplied uniformly. It is a graph which shows an example of transition of the amount of cooling water heat removal (Mcal / h) in the case of being performed. It is FIG. (1) for demonstrating a modification. It is FIG. (2) for demonstrating a modification.

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

As shown in FIG. 1, the flash smelting furnace 100 includes a raw material supply apparatus 1 and a furnace body 2. The raw material supply device 1 is also called a concentrate burner, and is a concentrate (copper concentrate (CuFeS ₂ or the like)), a main blast gas for reaction, an auxiliary gas for reaction, and a gas for dispersion (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 main blast 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 gas and dispersion gas disperse the concentrate, simultaneously oxidize it, and separate it into mats and slag at the bottom of the reaction shaft 3.

  FIG. 2 is an enlarged view of a part of the raw material supply apparatus 1, and is an explanatory view showing a charging unit 10 for charging the raw material, reaction gas, and dispersion 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 dispersion gas as a first gas passes and a fourth passage 14 through which a reaction auxiliary gas passes are formed. Yes. The charging unit 10 includes a second passage 12 as a raw material flow path provided on the outer periphery of the lance 16 and a third passage 13 as a reaction gas flow path provided on the outer periphery of the second passage 12. ing. Note that the second passage 12 and the third passage 13 are separated by a cylindrical partition wall 21.

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

  A hollow 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 dispersion gas that has passed through the first passage 11 into the reaction shaft 3 are formed in the lower side surface 151 of the dispersion cone 15.

  On the upper side of the partition wall 21 above the air chamber 17, a raw material homogenizing mechanism 30 is provided as an adjusting means. The raw material homogenizing mechanism 30 is a mechanism for homogenizing the distribution of concentrate passing through the second passage 12, and as shown in FIG. 2, the rectifying nozzle 32, a plurality of gas flow rate adjusting valves 34, A gas supply device 36; a non-contact type measuring device 38 (for example, a powder flowmeter or a particle size distribution measuring device using a microwave or a laser) as a measuring unit; and a control device 40 as a control unit. Yes.

  As shown in FIG. 3A, the rectifying nozzle 32 has an annular shape as a whole. The rectifying nozzle 32 has a plurality of divided blocks 42 as pipe members. In each of the divided blocks 42, a pipe line 42a is formed as shown in FIG. A gas pipe 44 is connected to the pipe line 42a. As shown in FIG. 3B, each divided block 42 can be fitted to a cut portion (slit) 21 a formed in the partition wall 21. The divided block 42 is fixed to the flanges 21 b and 21 c provided on the outer peripheral portion of the partition wall 21 by screws (or bolts) 72. That is, it can be said that the divided blocks are provided to be exchangeable with respect to the cut portion 21 a of the partition wall 21.

  The gas flow rate adjustment valve 34 is a valve that adjusts the amount of the raw material homogenizing gas as the second gas supplied from the gas supply device 36 to the gas pipe 44, and is controlled by the control device 40.

  The gas supply device 36 is a device that supplies a material homogenizing gas such as oxygen-enriched air into the second passage 12. The raw material homogenizing gas may be a part of the reaction gas described above. Further, any gas such as compressed air or compressed nitrogen may be used as the material homogenizing gas. The raw material homogenizing gas supplied from the gas supply device 36 passes through the gas pipe 44 and is blown out from the lower end (blow-out opening 42b) of the pipe line 42a. In addition, the blowing angle α of the gas for homogenizing the raw material shown in FIG. 3B is assumed to be in the range of 0 ° to 80 °. Note that the blowing angle α can be changed by exchanging the divided blocks 42. Also, the blowing angle of each divided block can be set individually (set to a different angle).

  In addition, in this embodiment, the structure which does not project the blower outlet 42b (lower end part of the pipe line 42a) to the internal space enclosed by the partition wall 21 is employ | adopted so that FIG.3 (b) may also show. Thereby, it is possible to prevent the blowout port 42b from being worn due to contact between the concentrate and the blowout port 42b. Moreover, it can also suppress that the blower outlet 42b inhibits the flow of concentrate.

  A plurality of non-contact type measuring instruments 38 (for example, powder flowmeters or particle size distribution measuring instruments using microwaves, lasers, etc.) are provided at predetermined intervals along the inner surface of the partition wall 21. The non-contact type measuring instrument 38 continuously measures the flow rate and distribution of the concentrate passing through the second passage 12.

  The control device 40 adjusts the opening degree of the gas flow rate adjustment valve 34 based on the measurement result of the non-contact type measuring instrument 38, and each pipe line 42a so that the distribution of the concentrate in the second passage 12 becomes uniform. The amount of the gas for uniformizing the raw material blown out from is adjusted.

  Here, in this embodiment, as shown to Fig.4 (a), it is assumed that concentrate is supplied from two directions with respect to the inside of the 2nd channel | path 12 from the supply part (supply chute) 50. FIG. In this case, if the raw material homogenizing mechanism 30 is not used, the concentrate distribution may be biased as shown in FIG. On the other hand, as shown in this embodiment, the raw material homogenizing mechanism 30 is used to blow the raw material homogenizing gas onto the concentrate to correct the flow of the concentrate, as shown in FIG. Thus, the distribution of concentrate can be made uniform. In addition, by spraying the gas for homogenizing the raw material on the concentrate, the particles of the concentrate can be dispersed by the aeration function (the lump can be eliminated), so the distribution of the concentrate is made more uniform. be able to. Moreover, in this embodiment, since the rectifying nozzle 32 has a plurality of divided blocks, the amount of blown-out gas for raw material homogenization can be finely adjusted. Accordingly, even when the concentrate distribution changes from moment to moment (for example, when the amount of concentrate input varies), the concentrate distribution in the second passage 12 can be made uniform.

  FIG. 5 is a diagram showing a state in which the inside of the reaction shaft 3 of the furnace body 2 is virtually divided into four parts (states divided into areas A to D). Here, the reaction degree of the concentrate in each region can be confirmed by measuring the heat removal amount (sensible heat of the cooling water) of the water jacket for cooling each region.

  FIG. 6 (a) shows an example of the transition of the amount of heat removed from the cooling water (Mcal / h) when the concentrate is supplied unevenly as shown in FIG. 4 (a). In the case of FIG. 6A, the amount of heat removed from the cooling water is not uniform in each region, and the variation in the region A is large, for example. On the other hand, FIG. 6B shows an example of the transition of the amount of heat removed from the cooling water when the concentrate is supplied uniformly as shown in FIG. 4B. In the case of FIG. 6 (b), the amount of heat removed from the cooling water is almost uniform in each region and the fluctuation is small, so it can be seen that the reaction degree of concentrate is equal and stable in each region. That is, in this embodiment, by using the raw material homogenizing mechanism 30, the reaction degree of concentrate in the reaction shaft 3 can be made equal in each region, and the concentrate can be reacted stably. It can be said.

  As described above in detail, according to the present embodiment, the raw material supply apparatus 1 is provided on the outside of the lance 16 through which the reaction gas passes, and the second passage 12 through which the concentrate (raw material) passes. And a raw material homogenizing mechanism 30 for adjusting the distribution of the concentrate by injecting a gas for homogenizing the raw material toward the concentrate passing through the second passage 12. The distribution of concentrate passing through can be made uniform. In addition, the aeration function of the gas for homogenizing the raw materials disperses the concentrate particles and lowers the particle density (can eliminate lumps). From this point, the concentrate distribution is made uniform. can do. Furthermore, in this embodiment, since a partition and a collision board are not provided in the 2nd channel | path 12 which is a raw material flow path, the flow of a raw material is not inhibited by a partition and a collision board. Also from this point, the raw materials can be made uniform.

  In the present embodiment, the raw material homogenizing mechanism 30 has a plurality of pipelines 42a for blowing the raw material homogenizing gas toward the concentrate, and the control device 40 measures the distribution of the concentrate. Based on the measurement result of the contact-type measuring instrument 38, the amount of the raw material homogenizing gas blown from each of the plurality of pipelines toward the concentrate is controlled. This makes it possible to appropriately adjust the amount of gas for homogenizing the raw material so that the concentrate becomes uniform based on the actual distribution of the concentrate. Can do. In this case, the division block 42 is adopted so that the amount of gas blown out from the plurality of pipes 42a can be finely adjusted individually, so that the concentrate distribution can be made uniform with high accuracy.

  Further, in the present embodiment, the divided block 42 having the pipe line 42a is provided so as to be exchangeable with respect to the cut portion 21a provided in the partition wall 21, so that the gas blowing angle α of the raw material uniformizing gas is set. Adjustment can be easily performed by replacing the divided block 42.

  Moreover, in this embodiment, since the supply part 50 supplies concentrate (raw material) from 2 directions with respect to the 2nd channel | path 12, for example, compared with the case where concentrate is supplied from 3 directions or 4 directions, Maintenance is improved and the degree of freedom in device design is also improved. In addition, even if the raw material is supplied from two directions, in the present embodiment, since the raw material homogenizing mechanism 30 is provided, the distribution of concentrate can be made uniform. However, the supply unit 50 may supply concentrate to the second passage 12 from not only two directions but also three or more directions.

  Moreover, in this embodiment, since the flash smelting furnace 100 is equipped with the raw material supply apparatus 1 which can supply a concentrate with a uniform state, reaction (solid-gas reaction) of a concentrate and oxygen is uniform. And it will be performed rapidly and it can suppress that a nonuniformity arises in a reaction product. Thereby, it can suppress that the partially peroxidized slag produces | generates and the metal loss to slag deteriorates.

  In the above embodiment, as shown in FIG. 7, movable dampers 60 and 80 may be provided in the pipe line 42a. The movable damper 60 includes a wing member 62 and a driving device 61 that can change the angle of the wing member 62 on the basis of the shaft 62a. According to the movable damper 60, the blowing angle α can be changed by changing the angle of the wing member 62. Similarly, the movable damper 80 includes a wing member 82 and a drive device 81 that can change the angle of the wing member 82 with reference to the shaft 82a. According to the movable damper 80, by changing the angle of the wing member 82, it is possible to change the gas blowing angle on the front side and the back side of the paper in FIG. The driving devices 61 and 81 are controlled by the control device 40.

  In the configuration of FIG. 7, the control device 40 adjusts the opening degree of the gas flow rate adjustment valve 34 and the angles of the wing members 62 and 82 of the movable dampers 60 and 80 based on the measurement result of the non-contact type measuring instrument 38. Thus, the concentrate distribution in the second passage 12 can be controlled to be uniform.

  Note that either one of the movable dampers 60 and 80 may be omitted. Alternatively, the number of movable dampers 60 and 80 may be increased.

  In the above embodiment, the non-contact type measuring instrument 38 may be provided in the vicinity of each pipeline 42a corresponding to each pipeline 42a. This makes it possible to accurately control the appropriate amount of gas blown out from each pipe line 42a.

  In the above embodiment, the case where the control device 40 controls the gas flow rate adjustment valve 34 based on the measurement result of the non-contact type measuring instrument 38 has been described, but the present invention is not limited to this. For example, the controller 40 monitors the amount of heat removed from the water jacket of the reaction shaft 3, and when the amount of heat removed from the coolant changes as shown in FIG. 6A, the control device 40 changes as shown in FIG. 6B. The gas flow rate adjustment valve 34 corresponding to each outlet provided in the rectifying nozzle may be controlled.

  In addition, in the said embodiment, the division | segmentation block 42 of the rectifying nozzle 32 has a structure as shown in FIG.3 (b), and it fits with respect to the cutting part (slit) 21a formed in the partition wall 21, Although the case where it fixes with the screw | thread (or bolt) 72 with respect to the flanges 21b and 21c was demonstrated, it is not restricted to this. For example, the divided block 42 may have a structure as shown in FIG. That is, a pipe 242a is formed inside each of the divided blocks 42 as shown in FIG. 8, and the pipe 242a is in communication with a blowing pipe 221a formed on the partition wall 21. Also good. In addition, the division block 42 and the partition wall 21 should just be fixed using a volt | bolt etc. which are not shown in figure.

  Note that the movable damper 60 and / or the movable damper 80 shown in FIG. 7 may be provided for the blowing pipe 221a shown in FIG. This makes it possible to adjust the gas blowing angle from the blowing pipe 221a.

  In addition, although the said embodiment demonstrated the case where the raw material equalization mechanism 30 was provided in the raw material supply apparatus (concentrate burner) in a flash smelting furnace, it is not restricted to this, It is the same as that of the said embodiment also to other reaction furnaces. A raw material homogenizing mechanism may be employed.

  The above-described embodiment is an example of a preferred embodiment of the present 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.

1 Raw material supply device 2 Furnace (self-fluxing furnace)
12 Second passage (raw material flow path)
16 Lance 21 Partition wall 21a Slit (cut)
30 Raw material homogenization mechanism (adjustment means)
38 Non-contact type measuring instrument 38 (measurement part)
40 Control device (control unit)
42 Pipe member 42a Pipe 50 Supply section

Claims (8)

A raw material supply apparatus for supplying a raw material into the flash smelting furnace and supplying a first gas contributing to the reaction of the raw material into the flash smelting furnace,
A raw material flow path through which the raw material passes, provided outside the lance through which the first gas passes;
An adjustment means for adjusting the distribution of the raw material by blowing a second gas toward the raw material passing through the raw material flow path;
The adjusting means includes
A measuring unit for measuring information related to the distribution of the raw material;
A raw material supply apparatus comprising: a control unit configured to adjust the blowing of the second gas so that the distribution of the raw material is uniform in the raw material flow path based on the measurement result of the measurement unit. . The adjusting means has a plurality of pipelines for blowing the second gas toward the raw material,
2. The material supply according to claim 1, wherein the control unit controls the amount of the second gas blown toward the material from each of the plurality of pipelines based on a measurement result of the measurement unit. apparatus. The adjusting means has a plurality of pipe members formed with pipes for blowing the second gas toward the raw material,
The raw material supply apparatus according to claim 2, wherein the plurality of pipe members are provided to be exchangeable with respect to a partition wall forming the raw material flow path.   4. The raw material supply apparatus according to claim 3, wherein the pipe member is provided so as to be replaceable with respect to a slit formed in a partition wall that forms the raw material flow path.   The raw material supply apparatus according to any one of claims 1 to 4, further comprising a supply unit that supplies the raw material from two directions to the raw material flow path.   A flash smelting furnace provided with the raw material supply device according to any one of claims 1 to 5. A raw material supply method for supplying a raw material into a flash furnace,
Blowing a gas into a raw material flow path through which the raw material passes;
Measuring information related to the distribution of the raw material dispersed by blowing the gas;
And a step of adjusting the blowing of the gas so that the distribution of the raw material is uniform in the raw material flow path based on the measurement result in the measuring step. In the step of blowing the gas, the gas is blown from a plurality of directions into the raw material flow path,
The raw material supply method according to claim 7, wherein in the adjusting step, an amount of gas blown from the plurality of directions and / or an angle of the blown gas is adjusted.

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