JP2017218640A - Mineral concentrate burner of copper smelting furnace and operation method of copper smelting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mineral concentrate burner of a copper smelting furnace and an operation method of the copper smelting furnace, capable of controlling in addition of a solid additive.SOLUTION: There is provided a mineral concentrate burner of a copper smelting furnace which is attached to an upper part of a reaction shaft of the copper smelting furnace and adding a starting material containing a copper concentrate into the copper smelting furnace, and having a raw material addition part for adding the starting material into the copper smelting furnace and an additive addition part arranged separately from the raw material addition part, for adding a solid additive to the starting material.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a concentrate burner for a copper smelting furnace and a method for operating the copper smelting furnace.

In recent years, raw materials to be processed by copper smelting are shifting from a raw material composition mainly composed of copper concentrate to a raw material composition with an increased ratio of highly profitable raw materials. However, it has not been able to cope with the worsening operation (slag loss). Due to the processing of the high margin raw material, the amount of hardly meltable material mainly composed of magnetite (Fe ₃ O ₄ ) is increased in the furnace. However, the mechanism was not specified, and it was only possible to respond after the furnace condition deteriorated. Moreover, in the situation where the raw material composition cannot be changed, there is no other effective solution, which forced the operation to deteriorate for a long time and greatly deteriorated the profit.

As a conventional technique, there is disclosed a method for dealing with the filling in the furnace and the increase in the intermediate layer caused by the peroxide slag (Fe ₃ O ₄ or the like) caused by the deterioration of the solid-gas reaction on the reaction shaft (for example, Patent Document 1). reference). However, in addition to being a reactive technology, this technology is less effective under operating conditions in which high margin raw materials have increased, and is not a sufficient countermeasure.

JP 2005-8965 A

According to the inventors' investigation, when the Al ₂ O ₃ concentration in the slag is increased due to the Al (aluminum) source in the raw material, the hardly fusible substance mainly composed of Al ₂ O ₃ and Fe ₃ O ₄ is It became easy to form, and it turned out that slag loss rises by the separation property of a mat | matte and slag worsening. However, an effective means for increasing Al in this raw material has not been obtained.

  In order to cope with such an increase in Al in the raw material, it is considered that a solid additive is introduced into the copper smelting furnace together with the raw material. When the solid additive is to be put into the copper smelting furnace together with the raw material, the raw material and the solid additive are prepared in advance, and then the prepared raw material and the solid additive are put into the reaction shaft through the concentrate burner. Can be considered.

However, if the raw material and the solid additive are prepared in advance, for example, if the furnace body has a problem and it is desired to stop the solid additive, the solid additive should be immediately stopped. The inconvenience that it is not possible is assumed. That is, since the solid additive is in a state of being mixed with the raw material and waiting before the concentrate burner, it is difficult to control the charging of the solid additive. Also, uneven distribution of the material composition due to slag in the concentration of Al ₂ O ₃ estimated at the time of preparation, to actually generated when like the concentration of Al ₂ O ₃ in the slag was increased, it was actually generated It is difficult to quickly change to an appropriate Fe addition amount according to the analysis value of slag.

  An object of this invention is to provide the operating method of the concentrate burner of a copper smelting furnace and the copper smelting furnace which can control injection | throwing-in of a solid additive in view of said subject.

  A concentrate burner for a copper smelting furnace according to the present invention is a concentrate burner for a copper smelting furnace that is attached to an upper part of a reaction shaft of a copper smelting furnace and that introduces a starting material containing copper concentrate into the copper smelting furnace. A starting material input part for supplying the starting material into the reaction shaft; and an additive input part provided separately from the starting material input part for supplying a solid additive to be added to the starting material. It is characterized by. The addition port of the additive charging part may be formed after the raw material charging part. The addition port of the additive charging part may be formed in a chute provided at the upper part of the raw material charging part. An addition port of the additive charging part is formed in a dispersion cone provided at a lower end of a lance that passes through the raw material charging part and forms a passage for blowing a dispersion gas for dispersing the starting raw material into the copper smelting furnace. May be. The solid additive may be a Fe metal source.

  The method for operating a copper smelting furnace according to the present invention includes a raw material charging unit for charging a starting material into a reaction shaft, and an additive for supplying a solid additive to be added to the starting material, provided separately from the raw material charging unit. A copper smelting furnace having a concentrate burner attached to the upper part of the reaction shaft, the solid additive being added to the raw material input part through the additive input part. It is characterized in that it is charged separately from the starting material at the position. The solid additive may be a Fe metal source.

  According to the concentrate burner of the copper smelting furnace and the method of operating the copper smelting furnace according to the present invention, the charging of the solid additive can be controlled.

It is the schematic of the flash smelting furnace used for one Embodiment of the smelting method of copper. It is explanatory drawing which shows typically the concentrate burner of embodiment. It is explanatory drawing which shows the dispersion | distribution cone seen from the A side in FIG. It is explanatory drawing which shows typically a mode that a starting raw material and a Fe metal source are thrown in by the concentrate burner of embodiment. It is explanatory drawing which shows typically the concentrate burner of other embodiment. It is explanatory drawing which shows typically a mode that a starting material and a Fe metal source are thrown in by the concentrate burner of other embodiment.

  Hereinafter, the best mode for carrying out the present invention will be described.

(Embodiment)
FIG. 1 is a schematic view of a flash smelting furnace (hereinafter referred to as “flash furnace”) 1 used in an embodiment of a copper smelting method. As shown in FIG. 1, the flash smelting furnace 1 includes a furnace body 2. The furnace body 2 has a structure in which a reaction shaft 3, a setter 4 and an uptake 5 are arranged in order. A concentrate burner 10 is provided on the upper part 3 a of the reaction shaft 3. The flash smelting furnace 1 in the present embodiment is a copper smelting furnace.

In copper smelting using the flash smelting furnace 1, a raw material for copper smelting from the concentrate burner 10, a solvent, a recycled material, etc. (hereinafter, these solid materials are referred to as starting materials) and a reaction containing oxygen Gas is introduced into the reaction shaft 3. As a result, the raw material for copper smelting undergoes an oxidation reaction according to the following reaction formula (1) and the like, and is separated into a mat 50 and a slag 60 at the bottom of the reaction shaft 3 as illustrated in FIG. In the following reaction formula (1), Cu ₂ S · FeS corresponds to the main component of the mat, and FeO · SiO ₂ corresponds to the main component of the slag. Silicate ore is used as the solvent.
CuFeS ₂ + SiO ₂ + O ₂ → Cu ₂ S · FeS + 2FeO · SiO ₂ + SO ₂ + reaction heat (1)

  For example, oxygen-enriched air can be used as the reaction gas. Oxygen-enriched air is air that has a higher oxygen concentration than natural air. For example, oxygen enriched air has an oxygen concentration of 60% to 90% by volume. Thereby, sufficient oxidation reaction can be made to the raw material for copper smelting. As will be described in detail later, the reaction gas of this embodiment is introduced into the reaction shaft 3 as a reaction main blowing gas and a reaction auxiliary gas.

Component of copper smelting raw material for, for example, Cu: 26mass% ~32mass%, Fe: 25mass% ~29mass%, S: 29mass% ~35mass%, SiO 2: 5mass% ~10mass%, Al 2 O 3: 1mass% ~ 3 mass%. Al component of the high content of copper concentrate, for example, Cu: 24mass% ~30mass%, Fe: 23mass% ~28mass%, S: 29mass% ~35mass%, SiO 2: 7mass% ~12mass%, Al 2 O ₃ : ₃ mass% to 7 mass%.

Al ₂ O ₃ forms a complex oxide (FeAl ₂ O ₄ ) with FeO and dissolves in magnetite (Fe ₃ O ₄ ). In this case, magnetite spinel is generated due to the presence of Al ₂ O ₃ , and Fe ₃ O ₄ is stabilized. As a result, the amount of solid Fe ₃ O ₄ in the molten metal increases, the slag fluidity deteriorates, and the slag loss tends to increase due to the deterioration of slag and mat separation. When the oxygen potential is lowered by the coexistence of the molten metal and Fe metal, the oxidation of FeO is suppressed and the allowable concentration of Al ₂ O ₃ in the slag 60 is increased. As a result, the formation of complex oxide (FeAl ₂ O ₄ ) and Fe ₃ O ₄ is suppressed.

Based on the above knowledge, in order to reduce slag loss, it is necessary to increase the allowable concentration of Al ₂ O ₃ in the slag 60 when the concentration of Al ₂ O ₃ in the raw material for copper smelting increases. On the other hand, even if Fe metal is added to the slag 60 after the mat 50 and the slag 60 are generated, it is difficult to suppress the generation of the composite oxide (FeAl ₂ O ₄ ). In addition, it is necessary to adjust the loading position and the like. Therefore, in this embodiment, an Fe metal source as a solid additive containing Fe metal is charged as a starting material at the stage of charging to the reaction shaft 3.

  Here, with reference to FIGS. 2 to 4, the concentrate burner 10 capable of introducing the Fe metal source into the starting material at the stage of charging to the reaction shaft 3 will be described. Drawing 2 is an explanatory view showing the concentrate burner of an embodiment typically. FIG. 3 is an explanatory diagram showing the dispersion cone viewed from the A side in FIG. Drawing 4 is an explanatory view showing typically signs that a starting material and a Fe metal source are thrown in by a concentrate burner of an embodiment. As described above, the concentrate burner 10 is provided on the upper portion 3a of the reaction shaft 3, and in addition to the starting material and the Fe metal source, the main blast gas for reaction, the auxiliary gas for reaction, and the gas for dispersion (reaction) Is also supplied into the furnace body 2.

  Referring to FIG. 2, the concentrate burner 10 includes an air introduction unit 11. The air introduction part 11 has the funnel-shaped part 11a in which the air intake port 11a1 was formed. The air piping 12 is connected to the air intake port 11a1, and the main blast gas for reaction is introduced into the funnel-shaped portion 11a as shown by an arrow 32 in FIG. The main blast gas for reaction introduced into the air introduction unit 11 is introduced into the reaction shaft 3 through the outlet 11b as indicated by arrows 33 and 34.

  The concentrate burner 10 includes a raw material charging unit 13. The raw material charging part 13 includes a chute part 13a that forms one or more inclined flow paths in the upper part thereof. The starting material stored in the hopper 7 installed above the concentrate burner 10 is put into the chute 13a. The lower end portion of the raw material charging portion 13 has a cylindrical shape and is disposed so as to pass through the air introduction portion 11. The outer peripheral wall surface at the lower end of the raw material charging unit 13 forms a first passage 14 together with the inner peripheral wall surface of the air introducing unit 11. The first passage 14 is a passage through which the main blast gas for reaction flows. The starting material in the material charging unit 13 is charged into the reaction shaft 3 through a discharge port 13b provided at the lower end.

  The concentrate burner 10 includes a lance 15. A dispersion cone 16 is formed at the tip of the lance 15. The lance 15 is formed of a cylindrical member and is disposed inside the raw material charging unit 13. The outer peripheral wall surface of the lance 15 forms a second passage 17 together with the inner peripheral wall surface of the raw material charging portion 13. The second passage 17 is a passage through which the starting material flows down.

  A cylindrical auxiliary air introduction portion 18 is disposed inside the lance 15. The outer peripheral wall surface of the auxiliary air introduction part 18 and the inner peripheral wall surface of the lance 15 form a third passage 19. Dispersing gas flows through the third passage 19. In addition, the cylindrical auxiliary air introduction part 18 forms the 4th channel | path 20, and the 4th channel | path 20 becomes a channel | path through which the auxiliary gas for reaction distribute | circulates as shown by the arrow 35 in FIG. Yes.

  The dispersion cone 16 has a hollow frustum shape. Referring to FIG. 3, a plurality of supply holes 162 that discharge the dispersion gas that has passed through the third passage 19 into the reaction shaft 3 are formed in the lower side surface 161. Is formed. Referring to FIG. 3, the supply holes 162 are radially provided in the dispersion cone 16, and in FIG. 4, as shown by arrows 36, the dispersion gas is discharged toward the radially outer side of the bottom surface of the dispersion cone 16. It is formed to do. Further, the supply hole 162 is configured to discharge the dispersion gas so as to intersect the normal direction of the bottom surface of the dispersion cone 16. Thus, the reaction between the concentrate and the reaction gas is completed at an early stage, the reaction is made uniform, and the reaction progress rate is made constant.

  The concentrate burner 10 includes an additive charging unit 21. The additive charging unit 21 is provided separately from the raw material charging unit 13 and inputs an Fe metal source which is a solid additive to be added to the starting raw material. The additive charging part 21 is connected to a hopper 8 installed above the additive charging part 21 so that an Fe metal source stored in the hopper 8 is supplied. The addition port 21 a of the additive charging part 21 may be formed after the raw material charging part 13. In the concentrate burner 10 of the present embodiment, the additive inlet 21 a of the additive charging part 21 is formed in a chute part 13 a provided on the upper part of the raw material charging part 13. Thereby, the Fe metal source is in a state of being mixed with the starting material for the first time after the material charging unit 13.

  Referring to FIG. 4, the starting material 30 is present alone on the upstream side of the chute portion 13 a. On the other hand, the Fe metal source 31 is also present alone in the additive charging unit 21. Then, the Fe metal source is mixed and mixed with the flow of the starting material through the addition port 21a formed in the chute 13a included in the raw material charging unit 13, that is, included in the concentrate burner 10.

  Thus, the following effects can be acquired by putting the Fe metal source 31 which is a solid additive into the position after the concentrate burner 10 separately from the starting raw material 30.

For example, when a failure occurs in the furnace body 2 and it is desired to stop charging the Fe metal source into the reaction shaft 3, the charging of the Fe metal source 31 can be stopped immediately. When an Fe metal source is to be introduced into the reaction shaft 3 together with the starting material 30, the starting material 30 and the Fe metal source 31 are prepared in advance, and the prepared starting material and the Fe metal source are concentrated with a conveyor or the like. It is conceivable to transfer to the reaction shaft 3. However, if the starting material 30 and the Fe metal source 31 are prepared in advance, the Fe material source 31 in a mixed state with the starting material 30 is mounted on a conveyor or the like, and is in a standby state before the concentrate burner. ing. For this reason, it is difficult to control the input of the Fe metal source 31. If it is the concentrate burner 10 of this embodiment, the injection | throwing-in of the Fe metal source 31 is controlled, for example, the injection | throwing-in of the Fe metal source 31 is interrupted immediately and only the injection | throwing-in of the starting raw material 30 can be continued. As a result, when an increase in the furnace body heat load or the like occurs, stable operation can be continued while avoiding damage to the furnace body. When the increase in the heat load of the furnace body 2 has settled, the introduction of the Fe metal source 31 can be resumed. In addition, even when the Al ₂ O ₃ concentration in the slag actually generated is higher than the Al ₂ O ₃ concentration in the slag estimated at the time of blending, etc., promptly according to the analytical value of the actually generated slag It is possible to adjust the amount of Fe added appropriately.

Moreover, according to the concentrate burner 10 of this embodiment, the addition amount of the Fe metal source 31 can be adjusted frequently. For example, the addition amount of the Fe metal source 31 can be adjusted in consideration of the Al ₂ O ₃ concentration in the starting material or in the actually generated slag and the operation status of the furnace body 2.

  Moreover, according to the concentrate burner 10 of this embodiment, reduction of slag loss, maintenance of molten metal tap property, and stable continuation of operation can be achieved.

  In addition, the addition port 21a of the additive addition part 21 should just be formed after the raw material injection | throwing-in part 13 provided in the concentrate burner 10, when paying attention to the flow direction of the starting raw material 30. FIG. For this reason, for example, as shown in FIGS. 5 and 6, an addition port 25 a provided at the tip of the dispersion cone 16 can be used.

  Specifically, instead of the additive charging part 21 shown in FIG. 2 and the like, a cylindrical additive charging part 25 may be provided in the auxiliary air introduction part 18 shown in FIGS. When such an additive charging unit 25 is provided, the Fe metal source 31 comes into contact with the hot mat 50 and the slag 60 droplets just generated by the reaction shaft 3 in the process of dropping, and is taken into the molten metal. That is, the Fe metal source 31 introduced from the addition port 25 a provided at the tip of the dispersion cone 16 comes into contact with the generated molten metal immediately below the dispersion cone 16. Even in such an additive charging unit 25, the charging of the Fe metal source 31 can be controlled. In addition, you may make it provide both the addition port 21a and the addition port 25a.

  As the Fe metal source, one containing 40 mass% to 100 mass% of Fe metal is used. As the Fe metal, pig iron or the like can be used. Compared with the case of using a material having a small Fe component such as a recycled material, a high reduction effect by Fe metal is obtained. In addition, you may use the thing containing 50 mass%-60 mass% Fe metal as a Fe metal source.

  If the particle diameter of Fe metal in the Fe metal source is too small, Fe metal may be oxidized and burned by the reaction gas oxygen in the reaction shaft 3 and the reduction effect may be reduced. On the other hand, if the particle diameter of Fe metal is too large, it may settle to the furnace bottom before exhibiting the reduction effect, and a phenomenon specialized for furnace bottom reduction may occur. Therefore, it is preferable to keep the particle diameter of Fe metal in the Fe metal source within a predetermined range. For example, the particle diameter of Fe metal in the Fe metal source is preferably 1 mm to 10 mm, for example.

As the Fe metal in the Fe metal source, those having different particle diameters may be mixed and used. For example, in the case where Al ₂ O ₃ in the slag 60 in the furnace exceeds 4.5 mass% and a starting material that is expected to rise further is processed, Fe metal having a particle size distribution of 5 to 10 mm is 40 mass%, 1 60 mass% of Fe metal having a particle size distribution of ˜5 mm may be mixed, and the addition amount may be 120 kg / h. This is because the oxygen potential of the generated molten metal can be kept low, and high Al ₂ O ₃ slag can be reduced by suspending a relatively large Fe metal with respect to the slag 60 already present in the furnace. In the case where Al ₂ O ₃ in the slag 60 in the furnace is less than 4 mass%, but Al ₂ O _{3 in the} slag to be produced is considered to exceed 4.5 mass%, Fe metal having a particle size distribution of 5 to 10 mm is used. 20 mass%, Fe metal having a particle size distribution of 1 to 5 mm may be mixed by 80 mass%, and the addition amount may be 60 kg / h. The main reason is that the oxygen potential of the molten metal immediately after generation can be kept low.

  Alternatively, particles having a particle diameter other than 1 mm to 10 mm may be mixed. For example, the particle diameter of 1 mm to 10 mm may be 80 mass% with respect to the entire Fe metal source, and the particle diameter of 10 mm to 15 mm may be 20 mass% to mix both.

Here, the use of carbon powder instead of Fe metal will be examined. When carbon powder is used, the reaction shaft 3 burns faster than copper concentrate, and the contribution rate as a heat compensation raw material becomes high, and the effect is low for the purpose of suppressing the formation of Fe ₃ O _{4 in} the slag. Although it is conceivable to obtain a reduction effect using a large amount of carbon powder, in this case, a wasteful heat of reaction is generated, so that the heat load increases. In addition, wasteful consumption of oxygen leads to a reduction in the amount of copper concentrate processing, leading to a reduction in production. In addition, the amount of copper concentrate processing decreases due to restrictions on the amount of gas introduced in the subsequent process, leading to a reduction in production. In addition, the heat load of the furnace body rises due to the combustion heat of the coke that does not contribute to the reduction and burns, causing melting trouble such as a water cooling jacket for cooling the furnace body.

On the other hand, by using granular Fe metal, in the process in which the granular Fe metal falls within the reaction shaft, it contacts with the hot mat 50 and the slag 60 droplets that have just been generated in the reaction shaft 3, and the molten metal And the generation of Fe ₃ O ₄ due to the influence of Al ₂ O ₃ can be suppressed. It is thought that the effect of reduction becomes stronger than the effect of Al ₂ O ₃ by suppressing the formation of Fe ₃ O ₄ by increasing the degree of reduction by coexisting the high-temperature molten metal just formed and Fe metal. .

Moreover, when using granular or lump carbon, the carbon combustion efficiency in the reaction shaft 3 falls by the specific surface area fall, and it is estimated that the hot water arrives in a furnace. However, due to the difference in specific gravity, the granular or massive carbon floats on the surface layer of the molten metal, and only the surface layer of the slag 60 is reduced, and the contribution to the entire slag 60 is low, reducing the influence of Al ₂ O _3. The effect to do becomes low. On the other hand, by using Fe metal with a particle diameter adjusted, oxidation combustion of Fe metal by the reaction gas is suppressed, and sedimentation to the furnace bottom is also suppressed. Thereby, _Fe 3 _{O 4} inhibitory effect of Fe metal is more increased it.

The input amount of the Fe metal source is preferably determined according to the amount of Al ₂ O ₃ produced by the slag 60. The amount of Al ₂ O ₃ produced by the slag 60 can be estimated from the amount of Al ₂ O ₃ in the starting material. Since it contains Al, _Al 2 _{O 3,} or _the to recycle material in the starting material, the amount of _Al 2 _{O 3} (Al content) are also contemplated. Hereinafter, the Al ₂ O ₃ concentration (mass%) in the starting material is a concentration obtained by converting Al contained in the starting material (for example, recycled material) into Al ₂ O ₃ and adding them up.

The Al ₂ O ₃ concentration in the slag varies depending on the mixing ratio of the starting material, but is about 1.7 to 2.0 times the Al ₂ O ₃ concentration of the starting material. For example, when the Al ₂ O ₃ concentration in the starting material is 2.2 mass%, the Al ₂ O ₃ concentration in the slag is about 4.3 mass%. In consideration of this, for example, the starting material (excluding repetitive dust) is supplied in an amount of 130 t / h to 230 t / h (for example, 208 t / h), and oxygen having an oxygen concentration of 70% to 82% by volume as a reaction gas. when the enriched air and 640Nm ³ / min~700Nm ³ / min, that _Al 2 _{O 3} in the slag is _Al 2 _{O 3} in the starting material to produce the following 2.2 mass% becomes less 4.2mass Is predicted, the input amount of the Fe metal source is preferably 0 kg / h or more and 20 kg / h or less, and Al ₂ O ₃ in the starting material is generated at 2.2 mass% or more and 2.4 mass% or less. If it is predicted by calculation from the amount of Al ₂ O ₃ in the starting material that the Al ₂ O ₃ in the slag is 4.2 mass% or more and 4.5 mass% or less, Fe It is preferable that the input amount of the tar source is 20 kg / h or more and 42 kg / h or less, and Al ₂ O ₃ in the starting material is 2.4 mass% or more and 2.5 mass% or less, and Al ₂ O ₃ in the slag to be generated Is expected to be 4.5 mass% or more and 4.7 mass% or less, the input amount of the Fe metal source is preferably 42 kg / h or more and 105 kg / h or less, and Al ₂ O ₃ in the starting material Is 2.5 mass% or more and 2.6 mass% or less, and when Al ₂ O ₃ in the generated slag is expected to be 4.7 mass% or more and 5.0 mass% or less, the input amount of the Fe metal source is 105 kg. is preferably not more than / h or 147 kg / h, in the _Al 2 _{O 3} in the starting material less 2.6Mass% or more 2.7mass%, Al ₂ of the resulting slag ₃ it is preferable that the input amount of Fe metal source if it is expected to be less 5.0 mass% or more 5.2Mass% or less 147 kg / h or more 160 kg / h.

_{Incidentally, Al 2 O 3, Fe 3} O 4, the concentration of _Cu and the like in the slag to be produced, may be confirmed by analyzing the extracted slag from the slag or refining cans furnace withdrawn from the flash smelting furnace 1. For example, the generated slag is sampled every hour, the Al ₂ O ₃ concentration in the slag is confirmed in real time by rapid analysis using XRF or the like, and an appropriate amount of Fe metal added to the generated slag, By feeding back to the setting of the Fe metal addition facility, operation adjustment with higher accuracy becomes possible.

According to this embodiment, the FeO source having an Fe metal content of 40 mass% to 100 mass% is introduced into the copper smelting furnace together with the starting material containing the copper concentrate containing Al and a solvent, thereby oxidizing FeO. Is suppressed, and the allowable concentration of Al ₂ O ₃ in the slag is increased. As a result, slag loss can be suppressed. For example, the Fe metal source may be introduced into the copper smelting furnace together with a starting material that is assumed to have an Al ₂ O ₃ concentration in the slag obtained by feeding into the copper smelting furnace exceeding 4.0 mass%. preferable. Alternatively, when the Al ₂ O ₃ concentration in the slag obtained by adding the starting material from the concentrate burner 10 exceeds 4.0 mass%, the above-mentioned Fe metal source is smelted with the starting material to be added thereafter. You may throw in in a furnace. Further, when _the concentration of _Al 2 _{O 3} in the starting material exceeds 2.0 mass%, it is preferred that together with the starting material to introduce the Fe metal source to a copper smelting furnace.

(Example)
According to the above embodiment, the copper smelting furnace was operated. The operating conditions and results are shown in Table 1. Until the 13th day, the average input amount of the starting material was 200 t / h, and the Fe metal source was not input. From the 14th day, the average input amount of the starting material was 208 t / h, and the average input amount of the Fe metal source was 42 kg / h. Note that the Fe metal source was mixed with the starting material in advance and then charged from the concentrate burner. As the Fe metal source, one containing 55 mass% to 65 mass% Fe metal was used. The blowing of oxygen-enriched ^air, was 650Nm ³ / min~690Nm 3 / min.

In the range of up to 13 days, when the concentration of _Al 2 _{O 3} in the starting material increases, the concentration of _Al 2 _{O 3} in the slag was exceeded 4.5mass%. As a result, the slag loss was 1% or more. This is presumably because a high Al ₂ O ₃ permissible concentration for slag was not obtained, and Fe ₃ O ₄ was stabilized by the presence of Al ₂ O ₃ . On the other hand, after the 14th day, Al ₂ O ₃ in the slag changed at a high value of 4.3 mass% or more (maximum 4.7 mass%), but the slag loss was maintained at a low value of about 0.8. We were able to. This is presumably because the formation of Fe ₃ O ₄ was suppressed by the introduction of the Fe metal source, and the allowable concentration of Al ₂ O _{3 in} the slag was increased. Moreover, after the 14th day, the increase of the flash smelting furnace intermediate layer and the smelting furnace intermediate layer could be suppressed.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

1 Flash smelting furnace (flash furnace)
2 furnace body 3 reaction shaft 10 concentrate burner 13 raw material input part 21, 25 additive supply part 21a, 25a addition port

Claims (7)

A copper smelting furnace concentrate burner attached to the upper part of the reaction shaft of the copper smelting furnace and introducing a starting material containing copper concentrate into the copper smelting furnace,
A raw material charging part for charging the starting raw material into the reaction shaft;
An additive charging unit provided separately from the raw material charging unit, for charging a solid additive to be added to the starting material;
A concentrate burner for a copper smelting furnace.   The concentrate burner for a copper smelting furnace according to claim 1, wherein the addition port of the additive charging part is formed after the raw material charging part.   3. The concentrate burner for a copper smelting furnace according to claim 1, wherein an addition port of the additive charging part is formed in a chute provided at an upper part of the raw material charging part.   An addition port of the additive charging part is formed in a dispersion cone provided at a lower end of a lance that passes through the raw material charging part and forms a passage for blowing a dispersion gas for dispersing the starting raw material into the copper smelting furnace. The concentrate burner for a copper smelting furnace according to any one of claims 1 to 3, wherein the burner is a concentrate burner.   The concentrate burner for a copper smelting furnace according to any one of claims 1 to 4, wherein the solid additive is an Fe metal source. An upper part of the reaction shaft, comprising: a raw material charging part for charging a starting material into the reaction shaft; and an additive charging part provided separately from the raw material charging part and for charging a solid additive to be added to the starting material. A method for operating a copper smelting furnace equipped with a concentrate burner attached to
The method for operating a copper smelting furnace, wherein the solid additive is introduced separately from the starting raw material into the position after the raw material charging unit through the additive charging unit.   The method for operating a copper smelting furnace according to claim 6, wherein the solid additive is an Fe metal source.

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