JP4385788B2 - Rising flue - Google Patents

Description

  The present invention relates to a rising flue provided in a smelting furnace or the like.

  In general, as a copper smelting apparatus, a continuous smelting apparatus using a continuous multiple furnace system using an oxidation reaction as a means is known. This continuous smelter dissolves and oxidizes copper concentrate supplied with oxygen-enriched air, and the main component is a mat composed of a mixture of copper sulfide and iron sulfide, and gangue, solvent, and oxidation in the copper concentrate. A smelting furnace for producing slag composed of iron, etc., a separation furnace for separating the mat and slag produced by the smelting furnace, a copper making furnace for further oxidizing the separated mat to produce crude copper, In order to purify the molten metal produced in this copper making furnace and produce higher quality copper, a plurality of refining furnaces are provided. The smelting furnace and the copper making furnace are provided with a plurality of lances including a plurality of pipes for supplying copper concentrate, oxygen-enriched air, a solvent, a coolant, and the like into the furnace. The separation furnace is an electric furnace equipped with electrodes. These smelting furnaces, separation furnaces, copper making furnaces and refining furnaces are provided with a difference in height in this order, and are connected by a flame that is a flow path of the molten metal, so that the molten metal flows down by gravity. It has become.

  In order to refine copper in the above configuration, oxygen enriched air is blown into the dried copper concentrate and flux. In the smelting furnace, the raw material is melted and the oxidation reaction proceeds, and the main component is a mat composed of a mixture of copper sulfide and iron oxide and slag composed of gangue, solvent, iron oxide, etc. in the copper concentrate. . The mat and the slag are sent to the separation furnace by a reed that connects the smelting furnace and the separation furnace, where they are separated into a lower layer mat and an upper layer slag due to a difference in specific gravity. The slag of the separation path overflows and the liquid level is constant. Here, since the produced slag contains almost no copper, it is discharged out of the system as it is.

  On the other hand, the mats separated in the separation furnace are sent to the copper making furnace by a rod connecting the separation furnace and the copper making furnace. In this copper making furnace, oxygen-enriched air is further blown to oxidize sulfur and iron in the mat to obtain crude copper having a purity of 98.5%. In the copper making furnace, the continuously produced crude copper is injected into the refining furnace. Moreover, in the oxidation process in this copper making furnace, a part of copper is also oxidized and taken into the slag. That is, slag is made into a solid powder by water granulation, dried, inserted into a smelting furnace, and dissolved together with copper concentrate to recover copper. Three refining furnaces are provided, and one refining furnace accepts molten metal (melted metal ore, which means melted crude copper) generated from a copper making furnace. In the meantime, in other refining furnaces, the operation of casting the molten metal received in advance as an anode by oxidizing and reducing the molten metal is performed in parallel.

Here, the rising flue provided in the smelting furnace is provided between the furnace and a device (for example, a boiler or an exhaust gas treatment device) provided in the subsequent stage, and is generated in the furnace. High-temperature exhaust gas is led to a subsequent apparatus.
Conventionally, the wall portion of the rising flue has been constituted by stacked bricks, but there is a problem that the bricks expand due to high-temperature exhaust gas. (For example, refer to Patent Document 1).
In order to solve this problem, as the wall of the improved rising flue, stacked bricks, a shelf board that is divided by partitioning the bricks, and an expansion absorber disposed at the lower part of the shelf board, Is made up of. This rising flue is raised substantially vertically from the ceiling of the furnace body, and its upper end is formed in a substantially rectangular cross section. The expansion absorbing material for the wall is provided with an expansion allowance in advance for the expansion of the brick, and prevents deformation of the entire wall due to the expansion of the brick by high-temperature exhaust gas or the like.
JP 2000-063962 A

  By the way, in the rising flue described in Patent Document 1 described above, the high temperature exhaust gas generated in the furnace is discharged to a subsequent apparatus, but the high temperature exhaust gas contains iron, copper, sulfur and the like. These substances rise and react with the bricks that form the flue to alter the bricks. As a result, the brick expands far beyond the theoretical expansion rate, and the wall 101 deforms beyond the expansion allowance of the expansion absorber as shown in FIG. 9 and protrudes toward the inside of the rising flue. And then collapsed inside the flue. In addition, in order to prevent the rising flue from collapsing, maintenance and repairs must be carried out in detail, and there is a problem that it takes time and effort. In addition, since the furnace must be stopped for this maintenance, there is a problem that continuous operation over a long period of time cannot be performed.

  The present invention has been made in view of such circumstances, and its purpose is to provide a rising flue that prevents collapse of the wall due to the expansion of bricks and enables continuous operation of the furnace over a long period of time. There is to do.

In order to achieve the above object, the present invention proposes the following means.
According to the first aspect of the present invention, a wall portion in which an outer wall portion is disposed outside an inner wall portion is formed in a cylindrical shape, the outer wall portion is a metal wall portion, and the inner wall portion includes a plurality of bricks. Is a rising flue that guides the high-temperature exhaust gas generated from the furnace to a subsequent apparatus, wherein the inner wall is partitioned into one or more regions, and the outer peripheral portion of the partitioned region A cooling jacket for flowing a cooling medium is disposed in the water channel, the cooling jacket is disposed in a vertical direction and a horizontal direction, and the outer wall portion is provided in at least one of the cooling jackets disposed in the horizontal direction. A shelf plate that supports the cooling jacket is provided via a stay fixed to the wall, and an expansion absorber is provided between the shelf plate and the brick, and the shelf plate is fixed to the outer wall portion. Of the expansion absorber The position is freely movable in accordance with the displacement .
According to the rising flue according to the present invention, even when the brick constituting the inner wall portion is expanded by the high-temperature exhaust gas generated from the furnace, the wall portion is partitioned by the cooling jacket, thereby Since the overhang of the inner wall portion can be suppressed only within the compartment, the collapse of the wall portion is prevented. Moreover, since the temperature rise of a wall part can be suppressed with a cooling jacket, expansion | swelling of a brick can be reduced.

Moreover, since the shelf board supported by the stay supports the cooling jacket, the cooling jacket can be firmly fixed. In addition, since the expansion absorber is provided under the shelf board, even if the expansion of the brick occurs, the displacement of the inner wall portion can be suppressed by the expansion absorber, so that the protrusion of the inner wall portion can be more reliably prevented. .

According to a second aspect of the present invention, in the rising flue of the first aspect, the cooling jacket disposed in the lateral direction biases the cooling jacket toward the outer wall portion, and the cooling jacket. And a rising flue characterized by comprising supporting means for moving the frame vertically.
According to the rising flue according to the present invention, the cooling jacket arranged in the lateral direction is urged in the direction of the outer wall by the urging means, and is movable in the vertical direction by the support means. Even if the cooling jacket is bulged from the inner wall due to the expansion of the brick, it can be moved in the vertical direction by the moving means, but is urged in the direction of the outer wall by the urging force of the urging means. Can be prevented from collapsing.

  According to the present invention, even if the brick expands due to high-temperature exhaust gas, the inner wall portion is divided by the cooling jacket, so that a large deformation can be prevented. Moreover, since this rising flue continues cooling the inner wall part with the cooling jacket, it can suppress a temperature rise. Therefore, the rising flue does not collapse, enabling continuous operation over a long period of time, and does not require maintenance work to prevent the collapse.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a continuous smelting apparatus 1 for copper using a multiple furnace system using the present invention. The continuous smelting apparatus 1 includes a smelting furnace 2, a separation furnace 3, a copper making furnace 4, and a refining furnace 5. In addition, the continuous smelting apparatus 1 is provided with a difference in height in the order of the smelting furnace 2, the separation furnace 3, the copper making furnace 4, and the refining furnace 5, and between these furnaces, the slag 6A, 6B , 6C are provided.
The smelting furnace 2 and the copper making furnace 4 are provided with a plurality of lances 7 and 8 having a double-pipe structure suspended from the respective ceiling portions, and the separation furnace 3 is provided with an electrode 9.

  As shown in FIGS. 2 and 3, the smelting furnace 2 has a furnace body 11 formed in a bottomed cylindrical shape, and a ceiling portion 12 provided so as to cover the furnace body 11. And a rising flue 13 formed. The rising flue 13 is formed by being surrounded by four walls, and is connected to a device (not shown) (for example, a heat removal boiler, an exhaust gas treatment device, etc.) disposed in the subsequent stage.

As shown in FIG. 4, the rising flue 13 is formed in a cylindrical shape, and is opposed to wall portions 14 and 15 that are formed substantially in parallel with each other, and a wall portion 16 that is formed in a cross-sectional arch shape. The wall portion 17 is also formed in the same arch shape. The wall portions 14, 15, 16, and 17 are, for example, outer wall portions 14A, 15A, 16A, and 17A made of metal such as iron, and inner wall portions 14B, 15B, 16B, and 17B configured by stacking a plurality of bricks. It is composed of Further, as shown in FIGS. 5 and 6, the walls 14, 15, and 16 are provided with cooling jackets 18 arranged in the vertical direction and the horizontal direction. The cooling jacket 18 is provided with a water channel 19 formed by drilling a solid iron block with a drill or the like. The water channel 19 is provided with an intake port for taking in cooling water from the outside, whereby the cooling water is circulated in the water channel 19.
The cooling jackets 18 are arranged in a straight line in the vertical direction of each of the wall portions 14, 15, 16 and in three rows in a direction perpendicular to the vertical direction in the horizontal direction. The cooling jackets 18a, 18b, and 18c arranged in the vertical direction have a rigid structure fixed to the outer wall portions 14A, 15A, and 16A by welding. Further, a biasing means 41 is provided on the back side of the cooling jacket 18A arranged in the lateral direction, and biasing force is applied toward the outer wall portion 16A side (left side in FIG. 8).

  Specifically, as shown in FIG. 8, the cooling jacket 18 </ b> A arranged in the lateral direction is provided with an intake port 42 on the outer wall portion 16 </ b> A side. A gap 43 is provided between the cooling jacket 18A and the outer wall portion 16A. A shaft portion 44 is provided on the back side of the cooling jacket 18A. A through hole (support means) 45 formed in a rectangular shape in the vertical direction is formed in the outer wall portion 16A, and the shaft portion 44 is inserted through the through hole 45 and protrudes to the outside of the outer wall portion 16A. Yes. The shaft portion 44 is formed with a screw, and a nut 46 is fastened to the end portion. A spring 48 is provided between the nut 46 and the pressing piece 47 in contact with the outer wall portion 16A. The spring 48 applies a biasing force toward the outer wall portion 16A to the cooling jacket 18A. The cooling jacket 18 </ b> A can be moved in the vertical direction by a displacement of a castable 30 described later even if the brick expands. However, since the shaft portion 44 is inserted into the through hole 45, the longitudinal direction of the through hole 45 is Displacement along

The cooling jackets 18B and 18C have the same configuration. The cooling jackets 18A, 18B, and 18C are pulled out by the spring 41 because the springs 41 are pulled toward the outer wall portions 14A, 15A, and 16A by the compression force of the spring 41 even if the force of the cooling jackets 18A, 18B, and 18C is applied to the inside of the rising flue 13. Can be prevented.
As shown in FIG. 4, the cooling jacket 18 divides the wall portions 14, 15, and 16 into a plurality of regions, and the bricks of the inner wall portions 14 </ b> B, 15 </ b> B, and 16 </ b> B are stacked for each division. That is, the inner wall portions 14B, 15B, and 16B are partitioned into a plurality of regions, and the cooling jacket 18 is disposed on the outer peripheral portion of the partitioned regions. Further, the shape of the spring 48 is not limited to that shown in FIG. 8, and may be a leaf spring or a disc spring.

  As shown in FIG. 7, the inner wall portion 16B of the wall portion 16 of the rising flue 13 includes a cooling jacket 18, a shelf plate 21 disposed below the cooling jacket 18, a stay 22 that supports the shelf plate 21, and ceramic wool. It is comprised from the expansion absorption material 23 formed with (alumina) etc., and the brick wall part 24 comprised with a brick. In addition, between the brick 25 and the brick 26 of the inner wall portion 16B, a shelf board 27 is provided with an expansion absorbent material 28 and a stay 29. The shelf board 27 and the expansion absorbent material 28 are provided with a wall. The parts 14, 15, 16 are arranged extending in the lateral direction. The shelf plates 21 and 27 are not fixedly arranged on the wall portions 14, 15 and 16. In addition, a castable (unshaped refractory) 30 is provided inside the rising flue 13 of the cooling jacket 18 to protect the hot exhaust gas from directly contacting the cooling jacket 18. The walls 14 and 15 have the same configuration.

  A smelting method of the continuous smelting apparatus 1 using the rising flue 13 having the above configuration will be described. As described above, the dried copper concentrate and flux are blown into the smelting furnace 2 together with the oxygen-enriched air by the lance 7, and the oxidation reaction in the smelting furnace 2 is advanced, and the main components are copper sulfide and iron sulfide. And a slag composed of gangue, solvent, iron oxide and the like in the copper concentrate.

  Here, when producing molten metal in the smelting furnace 2, high-temperature exhaust gas is generated. As shown in FIGS. 2 and 3, the exhaust gas is processed by a device (not shown) that is guided to the rising flue 13 and disposed in the subsequent stage. As shown in FIG. 2, the rising flue 13 is formed in a substantially cross-sectional rectangular shape when viewed from above, and this is disposed at a position away from the furnace center, This is because the lance 8 is arranged near the center of the furnace, and the rising flue 13 and the lance 8 do not interfere with each other due to the installation and replacement work of the lance 8.

  The high-temperature exhaust gas generated in the furnace contains substances such as iron, copper, and sulfur, and reacts with bricks to promote the expansion of the bricks due to the high temperature of the exhaust gas. This causes the 16B brick wall 24 to protrude. However, as shown in FIGS. 4 to 6, the rising flue 13 includes cooling jackets 18 a, 18 b, 18 c fixed to the outer wall portions 14 A, 15 A, 16 A and urging means 41, and the outer wall portions 14 A, 15 A, By dividing the brick wall portion 24 into a plurality of regions by the cooling jackets 18A, 18B, and 18C urged by 16A, the protrusion of the brick wall portion 24 due to the expansion of the bricks is suppressed only within the divided region. . As shown in FIG. 7, when the brick expands, the expanded increase is absorbed by the expansion absorbents 23 and 28. That is, the expansion absorbers 23 and 28 are provided with an expansion allowance corresponding to the displacement due to the expansion of the brick wall 24 in advance, and the expansion of the brick wall 24 corresponding to the expansion allowance is compensated by this expansion allowance. Thus, deformation of the wall portion 16 is prevented. Further, since the shelf boards 21 and 27 are disposed without being fixed, even if the expansion absorbents 23 and 28 are displaced, the positions can be freely moved in accordance with the displacement. The walls 14 and 15 also prevent collapse by the same action as the wall 16 described above.

  Further, as shown in FIG. 5, since the cooling water circulates in the cooling jacket 18, the inner wall portions 14 </ b> B and 15 </ b> B of the wall portions 14, 15, and 16 are caused by the high temperature exhaust gas that moves in the rising flue 13. Even if the temperature of 16B rises, heat removal is performed to suppress the temperature rise. Further, as shown in FIG. 7, the castable 30 is installed inside the rising flue 13 of the cooling jacket 18, thereby preventing the low temperature corrosion of the surface of the cooling jacket 18 caused by the contact between the cooling jacket 18 and the exhaust gas. can do.

  The mat and slag generated in the smelting furnace 2 described above are sent to the separation furnace 3 by the dredge 6A, where they are separated into a lower-layer mat and an upper-layer slag due to a difference in specific gravity. The slag of the separation furnace 3 overflows and the liquid level is constant. Since the slag produced here has almost no copper content, it is taken out of the system as it is. The mat separated in the separation furnace 3 is sent to the copper making furnace 4 through the basket 6B. In the copper making furnace 4, oxygen-enriched oxygen is further blown to oxidize sulfur and iron in the mat to produce a molten metal made of crude copper having a purity of 98.5%. The molten metal continuously generated in the copper making furnace 4 is discharged to the firewood 6C. Further, in this process, in the oxidation process in the copper making furnace 4, a part of copper is also oxidized and taken into the slag. That is, a considerable amount of copper oxide (14 to 16%) is contained in the slag of the copper making furnace 4 together with iron oxide. For this reason, in a normal process, solid pulverization is performed by slag granulation of the copper making furnace 4, and after drying, it is introduced into the smelting furnace 2 and dissolved again to recover copper.

  The molten metal produced | generated by the copper-making furnace 4 is inject | poured into the refinement | purification furnace 5 through the eaves 6C, as shown in FIG. Here, three refining furnaces 5 are provided. For example, while the first refining furnace 5A receives the molten metal generated from the copper making furnace 4, the other refining furnaces 5B and 5C In addition, the work of casting an anode whose quality is further improved from the molten metal by oxidizing and reducing the previously received molten metal is performed in parallel. Thereby, copper can be refined.

According to the above configuration, the cooling jackets 18a, 18b, 18c fixed to the outer wall portions 14A, 15A, 16A, and the cooling jackets 18A, 18B biased to the outer wall portions 14A, 15A, 16A by the biasing means 41, Since the wall portions 14B, 15B, and 16B are divided by 18C, even when the brick expands, the protrusion can be suppressed only in the divided sections, and collapse can be prevented. Therefore, the smelting furnace 2 can be continuously operated over a long period of time, and it is not necessary to perform maintenance in detail, so that work efficiency can be improved.
Moreover, according to the said structure, since the cooling water circulates in the cooling jacket 18, even if the brick of wall part 14B, 15B, 16B is exposed to high temperature by high temperature waste gas, wall part 14B, 15B, 16B. Can be cooled, so that the expansion of the walls 14B, 15B, 16B can be minimized.
Moreover, according to the said structure, since the expansion | extension absorbers 23 and 28 are provided, since the displacement of wall part 14B, 15B, 16B which arises with a brick is preset as an expansion allowance, the expansion | swelling part of a brick is reduced. Since it absorbs, wall part 14B, 15B, 16B does not deform | transform greatly.

  Moreover, according to the said structure, since the castable 30 is provided inside the flue of the cooling jacket 18, the cooling jacket 18 and the hot exhaust gas which moves in the standing flue 13 do not contact directly. Therefore, the low temperature corrosion of the cooling jacket 18 can be prevented.

  In addition, although the case where this invention was applied to the smelting furnace of a continuous smelting apparatus was demonstrated in the said embodiment, it is not restricted to this, For example, it can apply also to a copper making furnace etc. Also by this, the same effect as the above embodiment can be obtained.

It is a schematic block diagram of the continuous smelting apparatus which concerns on one Embodiment of this invention. It is sectional drawing of the smelting furnace using the standing flue which concerns on one Embodiment of this invention. It is sectional drawing of the smelting furnace in FIG. It is sectional drawing of the standing flue which concerns on one Embodiment of this invention. It is sectional drawing which looked at the standing flue in FIG. 4 from the BB surface. It is sectional drawing which looked at the standing flue in FIG. 4 from CC plane. It is sectional drawing to which the principal part of the standing flue which concerns on one Embodiment of this invention was expanded. It is the figure which showed the spring of the standing flue which concerns on one Embodiment of this invention, Comprising: (a) is sectional drawing, (b) is a side view. It is sectional drawing of the standing flue in the conventional smelting furnace.

Explanation of symbols

13 Standing flue 14 Wall part 14A Outer wall part 14B Inner wall part 15 Wall part 15A Outer wall part 15B Inner wall part 16 Wall part 16A Outer wall part 16B Inner wall part 18 Cooling jacket 19 Waterway 22, 29 Stay 21, 27 Shelf board 28 Expansion absorber

Claims (2)

The outer wall portion is arranged outside the inner wall portion in a cylindrical shape, the outer wall portion is a metal wall portion, and the inner wall portion is configured by stacking a plurality of bricks, A rising flue that guides the high-temperature exhaust gas generated from the furnace to the downstream device,
The inner wall portion is partitioned into one or more regions, and a cooling jacket that causes the cooling medium to flow in the water channel is disposed on the outer peripheral portion of the partitioned region ,
The cooling jacket is arranged in the vertical direction and the horizontal direction, and at least one of the cooling jackets arranged in the horizontal direction is a shelf plate that supports the cooling jacket via a stay fixed to the outer wall portion. Provided, an expansion absorber is provided between the shelf board and the brick,
The rising flue is characterized in that the shelf plate is not fixed to the outer wall portion and can be moved freely in accordance with the displacement of the expansion absorber . In the rising flue of claim 1 ,
The cooling jacket arranged in the lateral direction includes biasing means for biasing the cooling jacket in the direction of the outer wall, and support means for allowing the cooling jacket to move in the vertical direction. The rising flue to be.

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