Top-blown smelting facility transformation method, continuous copper smelting facility and method

Abstract

The invention discloses a modification method of a top-blown smelting facility, a continuous copper smelting facility and a method. The modification method of the top-blown smelting facility comprises: eliminating the converter or converting furnace of the top-blown converting facility; reducing the furnace height of the top-blown smelting furnace of the top-blown smelting facility; eliminating the single submerged top-blown main lance of the top-blown smelting furnace; arranging at least three top-blown smelting lances spaced apart from each other on the top of the top-blown smelting furnace; adding a copper matte discharge port to the top-blown smelting furnace; eliminating the electrodes and electrode matching devices of the settling electric furnace of the top-blown smelting facility, arranging at least three top-blown converting lances spaced apart from each other on the top of the settling electric furnace to transform the settling electric furnace into a top-blown converting furnace; and connecting the copper matte discharge port of the top-blown smelting furnace with the copper matte inlet of the top-blown converting furnace through a flow channel. The method for transforming the top-blown smelting facility of the present invention can not only fully utilize the existing top-blown smelting facility, but also be conducive to the production of high-grade copper matte, create conditions for continuous blowing, and reduce the investment cost of continuous copper smelting.

Description

Technical Field

[0001] The present invention relates to the technical field of nonferrous metallurgy, and in particular to a method for transforming a top-blown copper smelting facility into a continuous copper smelting facility and the continuous copper smelting facility. Background Art

[0002] Top-blown smelting technology is widely used in the smelting of copper, nickel, lead, tin, iron and zinc slag as well as copper and lead. Top-blown smelting technology was developed in the 1870s and was rapidly promoted from the late 19th century to the first decade of the 20th century. More than a dozen top-blown smelters were built in the field of copper smelting. However, with the development of copper smelting technology and the improvement of environmental protection standards, the operating cost advantage of top-blown smelting technology is no longer there, and there is a need for upgrading and transformation. Summary of the invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0004] Top-blowing smelting technology, also known as oxygen-enriched top-blowing submerged lance molten pool smelting technology, mainly includes two top-blowing processes: Ausmelt and ISA. In 1981, Floyd, the main inventor of top-blowing smelting technology, established Ausmelt and applied top-blowing smelting technology to the smelting of copper, nickel, lead, tin, iron and zinc slag, which was called Ausmelt. At the same time, Mount Isa Mining Company of Australia also applied top-blowing smelting technology to the smelting of copper and lead, which was called ISA.

[0005] The inventors of the present invention have discovered and recognized through studying the characteristics of top-blown smelting technology that in existing top-blown smelting technology, whether it is the Ausmelt process or the Issa process, the top-blowing lance is a single lance and the lower end of the lance is immersed in the slag layer of the molten pool (therefore also called oxygen-enriched top-blown submerged single-lance molten pool smelting technology). Therefore, the slag layer in the furnace needs to be very thick, for example, the slag layer usually reaches about 1 meter, the copper matte seriously corrodes the lance, and the air volume of the single lance needs to be very large, so that the slag layer is seriously stirred when it is blown to the slag layer. In addition, since the lance sprays oxygen to the slag layer, the oxygen is transferred to the copper-sulfur layer through the slag layer, the slag layer is overoxidized, so that high-grade copper and sulfur cannot be produced, and the height of the smelting furnace needs to be very high.

[0006] At present, the top-blown copper smelting used in China mainly consists of two facilities and processes. The first process: the specific facilities are: top-blown smelting (Ausmelt furnace or Isa furnace) + sedimentation electric furnace + PS converter blowing, and the specific process is: copper concentrate, flux batching (- granulation) - top-blown smelting - electric furnace sedimentation separation, the output of copper matte and smelting slag, the copper matte is transported to the PS converter by ladle for blowing to produce blister copper; the second process: the specific facilities are top-blown smelting (Ausmelt furnace or Isa furnace) + sedimentation electric furnace + top-blown submerged single-lance top-blown blowing furnace, the specific process is: copper concentrate, flux batching (- granulation) - top-blown smelting - electric furnace sedimentation separation, the output of copper matte and smelting slag, the copper matte is transported to the top-blown blowing to produce blister copper.

[0007] The inventors discovered and realized from the above existing facilities and processes that both processes require a sedimentation electric furnace to sediment the copper sulfur and smelting slag discharged from the top-blown smelting furnace. The reason is that, as mentioned above, the existing top-blown smelting technology has serious stirring in the smelting furnace, and the copper matte and slag cannot be completely separated. It is necessary to use a sedimentation electric furnace for sedimentation, and then the copper matte separated by sedimentation is sent to the blowing furnace for blowing, which leads to large equipment investment, high cost and high energy consumption. In addition, for the first process, due to the use of a converter for blowing, a ladle must be used to transport the smelting melt to the PS converter. On the one hand, low-altitude pollution is serious, and on the other hand, the blowing is an intermittent operation, and continuous copper smelting cannot be achieved. For the second process, the top-blowing blowing is also a single spray gun, and the spray gun is also submerged. Therefore, continuous copper smelting in the true sense is not achieved.

[0008] Through research and analysis, in summary, the inventors found that the top-blowing smelting facilities and processes in the related art have the following problems:

[0009] (1) Low operating rate. Since a single top-blowing submerged spray gun is used to supply air, the life of the spray gun is short, usually 7 to 14 days. The spray gun needs to be frequently taken out of the furnace to be replaced.

[0010] (2) Due to the single top-blowing submerged spray gun, the air volume of the spray gun is large and the stirring is violent.

[0011] (3) The molten pool splashes severely, the furnace is high, the spray gun is too long, easy to deform, and has a short service life.

[0012] (4) The molten pool is stirred violently, and the copper matte and smelting slag cannot be completely separated in the molten pool. They must be separated by a sedimentation furnace, which has high operating costs.

[0013] (5) It is difficult to produce high-grade copper matte. Currently, there is no production practice of copper matte with a copper content of more than 65%, which cannot meet the requirements of continuous smelting.

[0014] (6) The supporting converter has poor environmental protection effect. Most top-blown smelting and smelting are equipped with PS converters to blow copper matte. During the lifting and blowing of copper matte, it is difficult to control the emitted SO2 flue gas.

[0015] (7) The required amount of fuel is large and the operating cost is high. For thermal balance and safe production considerations, top-blown smelting furnaces usually need to add a large amount of fuel and reducing agent, which increases the operating cost.

[0016] To this end, an embodiment of the present invention proposes a method for transforming a top-blown smelting facility into a continuous copper smelting facility. Using this method, the existing top-blown smelting facility can be transformed, thereby not only making full use of the existing top-blown smelting facility, but also reducing the investment cost of continuous copper smelting, and can at least to a certain extent solve one of the technical problems in the related art.

[0017] The embodiments of the present invention also provide a continuous copper smelting facility and method.

[0018] The method for transforming a top-blown smelting facility according to an embodiment of the first aspect of the present invention comprises:

[0019] Converters or converting furnaces without converting process;

[0020] Lowering the hearth height of the top-blown smelting furnace in the top-blown smelting process;

[0021] Eliminating the single submerged top-blowing lance of the top-blowing smelting furnace;

[0022] At least three top-blown smelting lances spaced apart from each other are arranged on the top of the top-blown smelting furnace;

[0023] Adding a copper matte discharge port to the top-blown smelting furnace;

[0024] Eliminating the electrodes and electrode matching devices of the settling furnace of the top-blowing smelting process, and arranging at least three top-blowing converting lances spaced apart from each other on the top of the settling furnace to transform the settling furnace into a top-blowing converting furnace;

[0025] The copper matte discharge port of the top-blown smelting furnace is connected to the copper matte inlet of the top-blown converting furnace through a launder.

[0026] The transformation method of the top-blown smelting facility proposed in the embodiment of the present invention has at least the following beneficial effects:

[0027] 1. The top-blown smelting furnace uses multiple spray guns for spray smelting, which can reduce the furnace height. After the furnace height is reduced, the mixed concentrate falls into the molten pool in the furnace with a small drop and a short time, which reduces the smoke rate, cancels the concentrate granulation process, reduces operating costs, and reduces the water content of the mixed concentrate; after the furnace height of the top-blown smelting furnace is reduced, the length of the spray gun is shortened, which reduces the deformation of the spray gun and increases the service life of the spray gun.

[0028] 2. Use multiple spray guns for spray smelting. The gas volume of a single spray gun is small, the splashing of the molten pool is small, and the required stirring radius is small. On the one hand, the thickness of the operating slag layer can be reduced, the risk of foam slag can be reduced, which is beneficial to increase the oxygen potential in the furnace, produce high-grade copper matte, and create conditions for continuous blowing; on the other hand, the stirring kinetic energy of the spray gun is reduced, which is beneficial to the sedimentation and separation of copper matte and smelting slag, and the sedimentation electric furnace can be eliminated to reduce operating costs.

[0029] 3. Make maximum use of existing top-blowing smelting facilities, reduce investment costs, and realize continuous blowing of high-grade copper matte, with low investment, short construction period, and short shutdown and resumption period.

[0030] 4. The top-blown smelting furnace and the top-blown converting furnace are connected by a flow channel, which avoids the problem of low-altitude SO2 pollution caused by the lifting of the copper matte bag and has a good environmental protection effect.

[0031] In some embodiments, the top-blowing smelting lance is a non-submerged top-blowing smelting lance or a submerged top-blowing smelting lance, and the top-blowing converting lance is a non-submerged top-blowing converting lance or a submerged top-blowing converting lance.

[0032] In some embodiments, the furnace height of the top-blown smelting furnace is reduced to 6 meters to 8 meters, the number of the top-blown smelting lances is 3 to 6, and the number of the top-blowing blowing lances is 4 to 12.

[0033] The continuous copper smelting facility proposed in an embodiment of the second aspect of the present invention includes: a top-blown smelting furnace, the top-blown smelting furnace having a smelting furnace body and at least three top-blown smelting lances, the top-blown smelting lances are arranged at the top of the smelting furnace body and spaced apart from each other, the smelting furnace body has a charging port, a smelting slag discharge port and a copper matte discharge port; a top-blown converting furnace, the top-blown converting furnace having a converting furnace body and at least three top-blown converting lances, the top-blown converting lances are arranged at the top of the converting furnace body and spaced apart from each other, the converting furnace body has a flux inlet, a copper matte inlet, a converting slag discharge port and a blister copper discharge port, the copper matte inlet is connected to the copper matte discharge port of the smelting furnace body through a flow channel.

[0034] The continuous copper smelting facility proposed according to the embodiment of the present invention has at least the following beneficial effects:

[0035] 1. The top-blown smelting furnace uses multiple spray guns for spray smelting, which can reduce the furnace height. After the furnace height is reduced, the mixed concentrate falls into the molten pool in the furnace with a small drop and a short time, which reduces the smoke rate, cancels the concentrate granulation process, reduces operating costs, and reduces the water content of the mixed concentrate; after the furnace height of the top-blown smelting furnace is reduced, the length of the spray gun is shortened, which reduces the deformation of the spray gun and increases the service life of the spray gun.

[0036] 2. Use multiple spray guns for spray smelting. The gas volume of a single spray gun is small, the splashing of the molten pool is small, and the required stirring radius is small. On the one hand, the thickness of the operating slag layer can be reduced, the risk of foam slag can be reduced, which is beneficial to increase the oxygen potential in the furnace, produce high-grade copper matte, and create conditions for continuous blowing; on the other hand, the stirring kinetic energy of the spray gun is reduced, which is beneficial to the sedimentation and separation of copper matte and smelting slag, and the sedimentation electric furnace can be eliminated to reduce operating costs.

[0037] 3. The top-blown smelting furnace and the top-blown converting furnace are connected by a flow channel, which avoids the problem of low-altitude SO2 pollution caused by the lifting of copper matte bags and has a good environmental protection effect.

[0038] In some embodiments, the top-blowing smelting lance is a non-submerged top-blowing smelting lance or a submerged top-blowing smelting lance, and the top-blowing converting lance is a non-submerged top-blowing converting lance or a submerged top-blowing smelting lance.

[0039] In some embodiments, the number of the top-blowing smelting lances is 3-6, and the number of the top-blowing blowing lances is 4-12.

[0040] In some embodiments, one of the top-blowing smelting lances is a spare top-blowing smelting lance, and one of the top-blowing converting lances is a spare top-blowing converting lance.

[0041] In some embodiments, the slag layer thickness in the smelting furnace body is 300 mm-800 mm, the slag layer thickness in the blowing furnace body is 100 mm-500 mm, the oxygen concentration of the oxygen-enriched air sprayed by the top-blowing smelting lance is 50%-90%, and the oxygen concentration of the oxygen-enriched air sprayed by the top-blowing blowing lance is 20%-50%.

[0042] The continuous copper smelting method proposed in an embodiment of the third aspect of the present invention comprises:

[0043] The copper concentrate, quartz, coal and mixed ingredients are mixed to prepare a mixed copper concentrate;

[0044] Adding the mixed copper concentrate into the top-blown smelting furnace from the charging port of the top-blown smelting furnace;

[0045] Spraying oxygen-enriched air of a first concentration into the top-blown smelting furnace through at least three top-blown smelting lances spaced apart from each other to perform smelting;

[0046] discharging smelting slag from a smelting slag discharge port of the top-blown smelting furnace;

[0047] Discharging the copper matte from the copper matte discharge port of the top-blown smelting furnace through a launder into the top-blown converting furnace;

[0048] Adding flux into the top-blowing converting furnace;

[0049] blowing oxygen-enriched air of a second concentration into the top-blowing converting furnace through at least three top-blowing converting lances spaced apart from each other to perform converting;

[0050] discharging the converted slag from a converted slag discharge port of the top-blown converting furnace;

[0051] The blister copper is discharged from the blister copper discharge port of the top-blowing converting furnace.

[0052] The continuous copper smelting method proposed in the embodiment of the present invention realizes the continuous blowing of high-grade copper matte, with low investment, short construction period and short interval between shutdown and resumption of production.

[0053] In some embodiments, the thickness of the slag layer in the smelting furnace body is controlled to be 300 mm-800 mm, the thickness of the slag layer in the blowing furnace body is controlled to be 100 mm-500 mm, the oxygen concentration of the oxygen-enriched air sprayed by the top-blowing smelting lance is 50%-90%, and the oxygen concentration of the oxygen-enriched air sprayed by the top-blowing blowing lance is 20%-50%. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a front view of the continuous copper smelting facility in an embodiment of the present invention.

[0055] Figure 2 4 is a top view of the continuous copper smelting facility in an embodiment of the present invention.

[0056] Reference numerals:

[0057] Top-blown smelting lance 1, copper matte siphon 2, smelting slag siphon pool 3, smelting slag launder 4, launder 5, siphon pool launder 6, top-blown converting lance 7, flux inlet 8, smoke outlet 9, blister copper discharge port 10, converting slag discharge port 11, smelting slag discharge port 12, copper matte discharge port 13, top-blown smelting furnace 14, smelting furnace body 141, top-blown converting furnace 15, converting furnace body 151, copper matte inlet 152. DETAILED DESCRIPTION

[0058] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0059] like Figure 1 As shown, the transformation method of the top-blown smelting facility proposed in an embodiment of the present invention includes:

[0060] The converter or blowing furnace in the original blowing process is cancelled, and only the top-blowing smelting furnace 14 and the settling electric furnace in the original top-blowing blowing process are retained.

[0061] The furnace height of the top-blown smelting furnace 14 in the original top-blown smelting process is reduced. Preferably, the furnace height of the top-blown smelting furnace 14 is reduced to 6 meters to 8 meters. The furnace top structure of the top-blown smelting furnace 14 after the furnace is lowered remains unchanged, and the boiler membrane wall connection is still adopted. The furnace wall includes a copper water jacket and refractory bricks. The bottom of the top-blown smelting furnace 14 is cooled by a vertical water jacket, and the top is cooled by a toothed water jacket.

[0062] The single submerged top-blowing lance of the original top-blowing smelting furnace is eliminated.

[0063] At least three top-blown smelting lances 1 spaced apart from each other are arranged on the top of the top-blown smelting furnace 14. The specifications and number of the top-blown smelting lances 1 are determined according to the furnace body diameter and the production scale. Preferably, the number of the top-blown smelting lances 1 can be 3-6.

[0064] like Figure 2 As shown, multiple top-blown smelting lances 1 are evenly spaced apart along the circumference of the top-blown smelting furnace 14. When the multiple top-blown smelting lances 1 are spaced apart from each other, they form a distribution circle A concentric with the circumference of the top-blown smelting furnace 14. The diameter of the distribution circle is 2-3 m. In some specific embodiments, four top-blown smelting lances 1 are provided, and the four top-blown smelting lances 1 are evenly spaced apart from each other along the circumference of the top-blown smelting furnace 14.

[0065] A copper matte discharge port 13 is additionally provided on the top-blown smelting furnace 14 .

[0066] The electrodes and electrode supporting devices of the original sedimentation furnace in the top-blowing smelting process are removed, the furnace wall is still the original copper water jacket and refractory brick structure, and at least three top-blowing converting lances 7 spaced apart from each other are arranged on the top of the original sedimentation furnace to transform the original sedimentation furnace into a new top-blowing converting furnace 15. The specifications and number of the top-blowing converting lances 7 are determined according to the furnace body diameter and the production scale. Preferably, the number of the top-blowing converting lances 7 can be 6-10.

[0067] like Figure 1 As shown, the matte discharge port 13 of the top-blown smelting furnace 14 is connected to the matte inlet 152 of the top-blown converting furnace 15 through a launder 5 (matte launder).

[0068] The method for transforming the top-blown smelting facility according to an embodiment of the present invention includes the following beneficial effects:

[0069] 1. The top-blown smelting furnace uses multiple spray guns for spray smelting, which can reduce the furnace height. After the furnace height is reduced, the mixed concentrate falls into the molten pool in the furnace with a small drop and a short time, which reduces the smoke rate, cancels the concentrate granulation process, reduces operating costs, and reduces the water content of the mixed concentrate; after the furnace height of the top-blown smelting furnace is reduced, the length of the spray gun is shortened, which reduces the deformation of the spray gun and increases the life of the spray gun.

[0070] 2. Use multiple spray guns for spray smelting. The gas volume of a single spray gun is small, the splashing of the molten pool is small, and the required stirring radius is small. On the one hand, the thickness of the operating slag layer can be reduced, the risk of foam slag can be reduced, which is beneficial to increase the oxygen potential in the furnace, produce high-grade copper matte, and create conditions for continuous blowing; on the other hand, the stirring kinetic energy of the spray gun is reduced, which is beneficial to the sedimentation and separation of copper matte and smelting slag, and the sedimentation electric furnace can be eliminated to reduce operating costs.

[0071] 3. Make maximum use of existing top-blowing smelting facilities, reduce investment costs, and realize continuous blowing of high-grade copper matte, with low investment, short construction period, and short shutdown and resumption period.

[0072] 4. The top-blown smelting furnace and the top-blown converting furnace are connected by a launder, which avoids the problem of SO2 pollution during the lifting of the copper matte bag and has a good environmental protection effect.

[0073] In some embodiments, the top-blowing smelting lance 1 is a non-submerged top-blowing smelting lance or a submerged top-blowing smelting lance 1, and the top-blowing converting lance 7 is a non-submerged top-blowing converting lance or a submerged top-blowing smelting lance 7. The top-blowing smelting lance 1 and the top-blowing converting lance 7 are both non-submerged or submerged, each lance has a small gas volume, and each lance is responsible for one area, and a thin slag layer operation can be used to improve the grade of copper matte, which is beneficial to reduce splashing, and can also reduce the furnace height and shorten the oxygen lance length.

[0074] In some embodiments, the modification method of the top-blowing smelting facility can also eliminate the single submerged top-blowing main lance of the original top-blowing smelting furnace 14, change the furnace body near the slag line to a copper water jacket structure, and install a side-blowing lance on the original top-blowing smelting furnace 14, thereby transforming the original top-blowing smelting furnace 14 into a side-blowing smelting furnace.

[0075] The modification method of the top-blowing refining facility can also add a flux bin, a feeding and metering device, and an air and oxygen supply system to the top of the sedimentation electric furnace of the original top-blowing smelting facility.

[0076] In some embodiments, the plurality of top blowing converting lances 7 are arranged along the width direction ( Figure 2 The top blowing lances 7 in each row are arranged in a plurality of rows at intervals along the length direction (in the left and right direction shown in FIG. 1 ) of the top blowing furnace 15. Figure 2 The front and rear directions as shown) are arranged at intervals.

[0077] Preferably, the plurality of top-blowing converting lances 7 are arranged in two rows spaced apart in the width direction of the top-blowing converting furnace 15. The top-blowing converting furnace has a center line extending in its length direction, and the two rows of top-blowing converting lances 7 are arranged symmetrically with respect to the center line.

[0078] like Figure 2In the specific embodiment shown, there are 12 top-blowing blowing lances 7, and the 12 top-blowing blowing lances 7 are distributed in two rows with 6 lances in each row, and the two rows of top-blowing blowing lances 7 are symmetrically arranged about the center line of the top-blowing blowing furnace 15 extending along its length direction, and the top-blowing blowing lances 7 in each row are evenly spaced from each other along the length direction of the top-blowing blowing furnace 15.

[0079] In some embodiments, the newly added copper matte discharge port 13 is externally connected to the copper matte siphon 2, the original siphon pool is transformed into a smelting slag siphon pool 3 for precipitating smelting slag, and a smelting slag flow channel 4 for discharging smelting slag is added to the transformed smelting slag siphon pool 3, and both ends of the smelting slag flow channel 4 are respectively connected to the smelting slag siphon pool 3 and the slag beneficiation system, and a siphon pool flow channel 6 is added to the transformed smelting slag siphon pool 3, and the siphon pool flow channel 6 is connected to the flow channel 5.

[0080] Please refer to the following Figure 1 and attached Figure 2 A continuous copper smelting facility according to an embodiment of the present invention is described.

[0081] like Figure 1-2 As shown, the continuous copper smelting facility proposed according to an embodiment of the present invention includes a top-blown smelting furnace 14 and a top-blown converting furnace 15 .

[0082] The top-blown smelting furnace 14 has a smelting furnace body 141 and at least three top-blown smelting lances 1, which are arranged on the top of the smelting furnace body 141 and are spaced apart from each other. Preferably, the number of top-blown smelting lances 1 can be 3-6. Figure 1 and Figure 2 As shown, the smelting furnace body 141 is cylindrical, the top-blowing smelting lance 1 is vertically arranged in the up and down direction, and the top of the top-blowing smelting lance 1 extends out of the smelting furnace body 141 and is connected to the air supply and oxygen supply system outside the smelting furnace body 141, and oxygen-rich air is continuously delivered to the top-blowing smelting lance 1 through the air supply and oxygen supply system.

[0083] The smelting furnace body 141 has a charging port (not shown), a smelting slag discharge port 12 and a copper matte discharge port 13. The charging port is also provided with an original mixed concentrate batching device, such as Figure 1 and Figure 2 As shown, the smelting slag discharge port 12 is connected to a smelting slag siphon pool 3, which is connected to the flow channel 5 through the siphon pool flow channel 6. The smelting slag siphon pool 3 discharges smelting slag through the smelting slag flow channel 4. The copper matte discharge port 13 is connected to the copper matte siphon channel 2, and the other end of the copper matte siphon channel 2 is connected to the flow channel 5.

[0084] The top-blowing converting furnace 15 comprises a converting furnace body 151 and at least three top-blowing converting lances 7, which are arranged on the top of the converting furnace body 151 and are spaced apart from each other. Preferably, the number of the top-blowing converting lances 7 may be 4-12. Figure 1 and Figure 2 As shown, the top-blowing blowing lance 7 is vertically arranged in the up-down direction, the lower end of the top-blowing blowing lance 7 is arranged inside the blowing furnace body 151 and the upper end extends out of the blowing furnace body 151, the extended part at the upper end of the top-blowing blowing lance 7 is connected to an external air supply and oxygen supply system, and the air supply and oxygen supply system continuously delivers oxygen-rich air to the top-blowing blowing lance 7.

[0085] The converting furnace body 151 has a flux inlet 8, a copper matte inlet 152, a converting slag discharge port 11 and a blister copper discharge port 10. Limestone, electrolytic residual anode and other copper-containing cold materials are added into the top-blown converting furnace 15 through the flux inlet 8, the copper matte inlet is connected to the copper matte siphon 2 outside the copper matte discharge port 13 of the smelting furnace body 141 through the flow channel 5, the converting slag discharge port 11 is arranged at the rear end of the converting furnace body 151, and the blister copper discharge port 10 is arranged on the left side of the converting furnace body 151. It can be understood that the setting positions of the converting slag discharge port 11 and the blister copper discharge port 10 are not limited to this.

[0086] The continuous copper smelting facility proposed according to the embodiment of the present invention includes the following beneficial effects:

[0087] 1. The top-blown smelting furnace uses multiple spray guns for spray smelting, which can reduce the furnace height. After the furnace height is reduced, the mixed concentrate falls into the molten pool in the furnace with a small drop and a short time, which reduces the smoke rate, cancels the concentrate granulation process, reduces operating costs, and reduces the water content of the mixed concentrate; after the furnace height of the top-blown smelting furnace is reduced, the length of the spray gun is shortened, which reduces the deformation of the spray gun and increases the life of the spray gun.

[0088] 2. Use multiple spray guns for spray smelting. The gas volume of a single spray gun is small, the splashing of the molten pool is small, and the required stirring radius is small. On the one hand, the thickness of the operating slag layer can be reduced, the risk of foam slag can be reduced, which is beneficial to increase the oxygen potential in the furnace, produce high-grade copper matte, and create conditions for continuous blowing; on the other hand, the stirring kinetic energy of the spray gun is reduced, which is beneficial to the sedimentation and separation of copper matte and smelting slag, and the sedimentation electric furnace can be eliminated to reduce operating costs.

[0089] 3. The top-blown smelting furnace and the top-blown converting furnace are connected by a launder, which avoids the problem of SO2 pollution during the lifting of the copper matte bag and has a good environmental protection effect.

[0090] In some embodiments, the top-blowing smelting lance 1 is a non-submerged top-blowing smelting lance 1 or a submerged top-blowing smelting lance 1. The top-blowing smelting lance 1 is a non-submerged or submerged type, each lance has a small gas volume, and each lance is responsible for an area, and a thin slag layer can be used to operate, improve the grade of copper matte, and reduce splashing, and can also reduce the furnace height and shorten the oxygen lance length.

[0091] In some embodiments, the top blowing converting lance 7 is a non-submerged top blowing converting lance 7 or a submerged top blowing smelting lance 7. The top blowing converting lance 7 is a non-submerged or submerged type, each lance has a small gas volume, and each lance is responsible for one area, and a thin slag layer operation can be adopted to improve the grade of copper matte and reduce splashing, and the furnace height can also be reduced and the oxygen lance length can be shortened.

[0092] In some embodiments, one of the top-blowing smelting lances 1 is a spare top-blowing smelting lance 1, and one of the top-blowing converting lances 7 is a spare top-blowing converting lance 7. Providing the spare top-blowing smelting lance 1 and the spare top-blowing converting lance 7 allows for uninterrupted operation when replacing the top-blowing smelting lance 1 and / or the top-blowing converting lance 7, thereby improving production efficiency.

[0093] In some embodiments, the thickness of the slag layer in the smelting furnace body is 300 mm to 800 mm, and the thickness of the slag layer in the blowing furnace body is 100 mm to 500 mm.

[0094] In some embodiments, the oxygen concentration of the oxygen-enriched air sprayed by the top-blowing smelting lance 1 is 50%-90%, and the oxygen concentration of the oxygen-enriched air sprayed by the top-blowing blowing lance 7 is 20%-50%. Increasing the oxygen concentration in the oxygen-enriched air can reduce the water content of the mixed concentrate, improve the grade of the copper matte, improve the heat balance conditions in the furnace, and no fuel such as pulverized coal / fuel oil needs to be mixed into the lance, and facilities such as pulverized coal preparation / oil depot can be eliminated, thereby reducing operating costs and fuel consumption.

[0095] In some embodiments, multiple top-blown smelting lances 1 are evenly spaced apart along the circumference of the top-blown smelting furnace 14. When the multiple top-blown smelting lances 1 are spaced apart from each other, they form a distribution circle A concentric with the circumference of the top-blown smelting furnace 14. The diameter of the distribution circle is 2-3 m. In some specific embodiments, four top-blown smelting lances 1 are provided, and the four top-blown smelting lances 1 are evenly spaced apart from each other along the circumference of the top-blown smelting furnace 14.

[0096] In some embodiments, Figure 1 and Figure 2 As shown, a plurality of top blowing converting lances 7 are arranged along the width direction ( Figure 2 The top blowing lances 7 in each row are arranged in two rows at intervals along the length direction (in the left and right direction shown in FIG. 1 ) of the top blowing furnace 15. Figure 2 The top-blowing converting furnace has a center line extending along its length direction, and the two rows of top-blowing converting lances 7 are symmetrically arranged relative to the center line.

[0097] In some embodiments, a cover plate 16 is further provided on the top of the blowing furnace body 151 of the top-blown blowing furnace 15 proposed in an embodiment of the present invention, and a smoke outlet 9 connecting the inner and outer sides of the blowing furnace body 151 is provided on the cover plate 16. The flux inlet 8 is also provided on the cover plate 16, and the original mixed concentrate batching device is also provided at the flux inlet 8.

[0098] The continuous copper smelting method proposed in an embodiment of the present invention comprises:

[0099] The existing concentrate batching mixing facilities are used to mix copper concentrate, quartz stone, coal and mixed ingredients to prepare mixed copper concentrate.

[0100] The mixed copper concentrate is added into the top-blown smelting furnace 14 from the feeding port of the top-blown smelting furnace 14 using the existing feeding facilities.

[0101] Oxygen-enriched air of a first concentration is injected into a top-blown smelting furnace 14 through at least three top-blowing smelting lances 1 spaced apart from each other to perform smelting.

[0102] The smelting slag is discharged from the smelting slag discharge port of the top-blown smelting furnace 14. Specifically, the smelting slag discharged through the discharge port enters the smelting slag siphon pool 3 for precipitation, and the smelting slag siphon pool 3 is provided with a smelting slag chute 4 for discharging the smelting slag, and the two ends of the smelting slag chute 4 are respectively connected to the smelting slag siphon pool 3 and the slag beneficiation system, and the smelting slag siphon pool 3 is also provided with a siphon pool chute 6, and the siphon pool chute 6 is connected to the chute 5. The smelting slag enters the slag ladle through the smelting slag chute 4, and is sent to the slag beneficiation system after slow cooling and crushing. The copper matte precipitated in the smelting slag siphon pool 3 regularly enters the chute 5 through the siphon pool chute 6 and finally enters the top-blown converting furnace 15.

[0103] The copper matte is discharged from the copper matte discharge port of the top-blown melting furnace 14 into the top-blown converting furnace 15 through the launder 5 .

[0104] The flux is added into the top-blowing refining furnace 15 by utilizing the existing loading facilities. The solvent may be limestone, electrolytic waste anode and other cold materials containing copper.

[0105] Blowing is performed by blowing oxygen-enriched air of a second concentration into the top-blowing blowing furnace 15 through at least three top-blowing blowing lances 7 spaced apart from each other.

[0106] The converted slag is discharged from the converted slag discharge port 11 of the converting furnace.

[0107] The blister copper is discharged from the blister copper discharge port 10 of the top-blowing converting furnace 15 .

[0108] The continuous copper smelting method proposed in the embodiment of the present invention realizes the continuous blowing of high-grade copper matte, with low investment, short construction period and short interval between shutdown and resumption of production.

[0109] In some embodiments, the thickness of the slag layer in the smelting furnace body 141 is controlled to be 300 mm to 800 mm. The thickness of the slag layer in the smelting furnace body 151 is controlled to be 100 mm to 500 mm.

[0110] In some embodiments, the copper matte layer in the smelting furnace body 141 has a thickness of less than 800 mm. The blister copper layer in the smelting furnace body 151 has a thickness of less than 500 mm.

[0111] In some embodiments, the oxygen concentration of the oxygen-enriched air injected by the top-blowing smelting lance 1 is 50%-90%, that is, the first concentration is 50%-90%. The oxygen concentration of the oxygen-enriched air injected by the top-blowing refining lance 7 is 20%-50%, that is, the second concentration is 20%-50%.

[0112] The operating temperature of the smelting slag in the smelting furnace body is 1250℃~1300℃, the operating temperature of the copper matte is 1230℃~1280℃, the iron-silicon ratio of the smelting slag (Fe / SiO2) is 1.3~2.0, the calcium oxide content of the smelting slag is 3%~5%, and the copper content of the smelting slag is 1%~3%. The operating temperature of the blister copper in the blowing furnace body is 1220℃~1260℃, the operating temperature of the blowing slag is 1250℃~1300℃, the Cu content of the blister copper is 97.5%~99%, the S content of the blister copper is 0.05%~0.8%, the calcium-iron ratio of the blowing slag (CaO / Fe) is 0.3~0.4, and the Cu content of the blowing slag is 13%~25%.

[0113] Please refer to the following Figure 1 and Figure 2 Some specific exemplary continuous copper smelting facilities according to the present invention are described.

[0114] The continuous copper smelting facility includes a top-blown smelting furnace 14 and a top-blown converting furnace 15 .

[0115] The top-blown smelting furnace 14 comprises a smelting furnace body 141 and four top-blown smelting lances 1 arranged on the top, the upper ends of the top-blown smelting lances 1 extend out of the top of the top-blown smelting furnace 14, the lower ends of the top-blown smelting lances 1 are vertically arranged inside the top-blown smelting furnace 14 along the up-down direction, the four top-blown smelting lances 1 are evenly spaced from each other along the circumference of the top-blown smelting furnace 14, and the multiple top-blown smelting lances 1 are spaced from each other to form a distribution circle A concentric with the circumference of the top-blown smelting furnace 14, the smelting furnace body comprises a charging port (not shown), a smelting slag discharge port 1 2 and a copper matte discharge port 13, the smelting slag discharge port 12 and the copper matte discharge port 13 are both arranged on the left side of the top-blown smelting furnace 14 and are spaced apart, the smelting slag discharge port 12 is connected to a smelting slag siphon pool 3, the smelting slag siphon pool 3 is provided with a siphon pool launder 6 connected with the launder 5, the smelting slag siphon pool 3 is also provided with a smelting slag launder 4 for discharging smelting slag, the copper matte discharge port 13 is connected to a copper matte siphon channel 2, the other end of the copper matte siphon channel 2 is connected with the launder 5, and the other end of the launder 5 is connected with a copper matte inlet 152 of the top-blown smelting furnace 15.

[0116] The top-blowing converting furnace 15 comprises a converting furnace body 151 and 12 top-blowing converting lances 7. The upper ends of the top-blowing converting lances 7 extend out of the top of the top-blowing converting furnace 15. The lower ends of the top-blowing converting lances 7 are vertically arranged inside the top-blowing converting furnace 15 along the up-down direction. The 12 top-blowing converting lances 7 are arranged in two rows with 6 lances in each row. The top-blowing converting lances 7 in the two rows are symmetrically arranged with respect to the center line extending in the length direction of the top-blowing converting furnace 15. The top-blowing converting lances 7 in each row are arranged along the front-back direction ( Figure 2 ) are evenly spaced from each other, the converting furnace body has a flux inlet 8, a copper matte inlet 152, a converting slag discharge port 11 and a blister copper discharge port 10, limestone, electrolytic residual anode and other copper-containing cold materials are added into the top-blown converting furnace 15 through the flux inlet 8, the copper matte inlet 152 is connected to the copper matte siphon 2 outside the copper matte discharge port 13 of the smelting furnace body through the flow channel 5, the converting slag discharge port 11 is arranged at the rear end of the converting furnace body 151, and the blister copper discharge port 10 is arranged on the left side of the converting furnace body 151. A cover plate 16 is also provided on the top of the converting furnace body 151, and a smoke outlet 9 connecting the inner and outer sides of the converting furnace body is provided on the cover plate 16, and the flux inlet 8 is also provided on the top cover plate 16.

[0117] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0118] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0119] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0120] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0121] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0122] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for transforming a top-blown smelting facility, characterized in that: include: Converters or converting furnaces without converting process; Reducing the hearth height of the top-blown smelting furnace in the top-blown smelting process; Eliminating the single submerged top-blowing lance of the top-blowing smelting furnace; At least three top-blown smelting lances spaced apart from each other are arranged on the top of the top-blown smelting furnace; Adding a copper matte discharge port to the top-blown smelting furnace; Eliminating the electrodes and electrode matching devices of the settling furnace of the top-blowing smelting process, and arranging at least three top-blowing converting lances spaced apart from each other on the top of the settling furnace to transform the settling furnace into a top-blowing converting furnace; Connecting the copper matte discharge port of the top-blown smelting furnace to the copper matte inlet of the top-blown converting furnace through a launder; The newly added copper matte discharge port is externally connected to a copper matte siphon channel, and the original siphon pool is transformed into a smelting slag siphon pool for precipitating smelting slag, and a smelting slag flow channel for discharging smelting slag is added to the transformed smelting slag siphon pool, and both ends of the smelting slag flow channel are respectively connected to the smelting slag siphon pool and the slag dressing system, and a siphon pool flow channel is added to the transformed smelting slag siphon pool, and the siphon pool flow channel is connected to the flow channel.

2. The method for transforming a top-blown smelting facility according to claim 1, characterized in that: The top-blowing smelting lance is a non-submerged top-blowing smelting lance or a submerged top-blowing smelting lance, and the top-blowing converting lance is a non-submerged top-blowing converting lance or a submerged top-blowing converting lance.

3. The method for transforming a top-blown smelting facility according to claim 1 or 2, characterized in that: The furnace height of the top-blown smelting furnace is reduced to 6 meters to 8 meters, the number of the top-blown smelting lances is 3 to 6, and the number of the top-blowing blowing lances is 4 to 12.

4. A top-blowing continuous copper smelting device, characterized in that: The method for transforming the top-blown smelting facility according to any one of claims 1 to 3 comprises: A top-blown smelting furnace, the top-blown smelting furnace comprising a smelting furnace body and at least three top-blown smelting lances, the top-blown smelting lances being arranged on the top of the smelting furnace body and spaced apart from each other, the smelting furnace body comprising a charging port, a smelting slag discharge port and a copper matte discharge port; A top-blown converting furnace, the top-blown converting furnace comprising a converting furnace body and at least three top-blown converting lances, the top-blown converting lances being arranged on the top of the converting furnace body and spaced apart from each other, the converting furnace body comprising a flux inlet, a copper matte inlet, a converting slag discharge port and a blister copper discharge port, the copper matte inlet being connected to the copper matte discharge port of the smelting furnace body through a launder; The newly added copper matte discharge port is externally connected to a copper matte siphon channel, and the original siphon pool is transformed into a smelting slag siphon pool for precipitating smelting slag, and a smelting slag flow channel for discharging smelting slag is added to the transformed smelting slag siphon pool, and both ends of the smelting slag flow channel are respectively connected to the smelting slag siphon pool and the slag dressing system, and a siphon pool flow channel is added to the transformed smelting slag siphon pool, and the siphon pool flow channel is connected to the flow channel.

5. The top-blowing continuous copper smelting device according to claim 4, characterized in that: The top-blowing smelting lance is a non-submerged top-blowing smelting lance, and the top-blowing converting lance is a non-submerged top-blowing converting lance or a submerged top-blowing smelting lance.

6. The top-blowing continuous copper smelting device according to claim 4, characterized in that: The number of the top-blowing smelting lances is 3-6, and the number of the top-blowing blowing lances is 4-12.

7. The top-blowing continuous copper smelting device according to claim 4, characterized in that: One of the top-blowing smelting lances is a spare top-blowing smelting lance, and one of the top-blowing converting lances is a spare top-blowing converting lance.

8. The top-blowing continuous copper smelting device according to any one of claims 4 to 7, characterized in that: The thickness of the slag layer in the smelting furnace body is 300 mm-800 mm, the thickness of the slag layer in the blowing furnace body is 100 mm-500 mm, the oxygen concentration of the oxygen-enriched air sprayed by the top-blowing smelting lance is 50%-90%, and the oxygen concentration of the oxygen-enriched air sprayed by the top-blowing blowing lance is 20%-50%.

9. A continuous copper smelting method, characterized in that: The top-blowing continuous copper smelting device according to any one of claims 4 to 8 comprises: The copper concentrate, quartz, coal and mixed ingredients are mixed to prepare a mixed copper concentrate; Adding the mixed copper concentrate into the top-blown smelting furnace from the charging port of the top-blown smelting furnace; Spraying oxygen-enriched air of a first concentration into the top-blown smelting furnace through at least three top-blown smelting lances spaced apart from each other to perform smelting; discharging smelting slag from a smelting slag discharge port of the top-blown smelting furnace; Discharging the copper matte from the copper matte discharge port of the top-blown smelting furnace through a launder into the top-blown converting furnace; Adding flux into the top-blowing converting furnace; blowing oxygen-enriched air of a second concentration into the top-blowing converting furnace through at least three top-blowing converting lances spaced apart from each other to perform converting; discharging the converted slag from a converted slag discharge port of the top-blown converting furnace; discharging blister copper from a blister copper discharge port of the top-blowing converting furnace; A copper matte siphon is connected to the outside of the copper matte discharge port, and the original siphon pool is transformed into a smelting slag siphon pool for precipitating smelting slag. A smelting slag flow channel for discharging smelting slag is added to the transformed smelting slag siphon pool, and both ends of the smelting slag flow channel are respectively connected to the smelting slag siphon pool and the slag dressing system, and a siphon pool flow channel is added to the transformed smelting slag siphon pool, and the siphon pool flow channel is connected to the flow channel.

10. The continuous copper smelting method according to claim 9, characterized in that: The thickness of the slag layer in the smelting furnace body is controlled to be 300 mm-600 mm, the thickness of the slag layer in the blowing furnace body is controlled to be 100 mm-500 mm, the oxygen concentration of the oxygen-enriched air sprayed by the top-blowing smelting lance is 50%-90%, and the oxygen concentration of the oxygen-enriched air sprayed by the top-blowing blowing lance is 20%-50%.

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