Method for improving the direct recovery of copper in an anode furnace

Abstract

The present application relates to copper smelting technical field, especially to a method for improving the direct recovery rate of anode furnace copper, comprising the steps of: pouring the crude copper into the anode furnace to obtain the first copper liquid; obtaining the second copper liquid through oxidation treatment and reduction treatment; and one-time shaking-out copper through the copper liquid control flow device installed on the copper outlet of the anode furnace and the copper tapping channel to realize the improvement of the direct recovery rate of the anode furnace copper; wherein the angle of one-time shaking-out copper is-78° to-82°, and the height difference between the copper outlet and the copper tapping channel is within 500 mm. The present application controls the temperature, oxygen content and chemical composition of the second copper liquid to ensure that the copper liquid has good flow characteristics and chemical quality, and then uses the copper liquid control flow device to cooperate with the copper tapping channel to realize one-time shaking-out copper, which maximally reduces the height difference between the copper outlet of the anode furnace and the copper tapping channel, improves the copper liquid spattering in the copper tapping process and the copper liquid sticking in the copper tapping channel, reduces the metal loss, and improves the direct recovery rate of the anode furnace copper.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of copper smelting, and particularly relates to a method for improving the direct recovery rate of copper in an anode furnace. BACKGROUND

[0002] The direct recovery rate of copper in an anode furnace is one of important indexes for measuring the control level of an anode furnace process and the advanced degree of equipment in the copper pyrometallurgical process. At present, in the process of producing anode plates in a rotary anode furnace, due to the influence of process control fluctuation and the copper tapping mode of cooperating the copper tapping opening of refractory brick masonry with a traditional copper tapping chute, there are problems such as great difference in the chemical properties of copper liquid, which affects the casting quality of anode plates, the height difference between the copper tapping opening and the chute, great spattering of high-temperature melt, serious copper liquid bonding of the copper tapping chute, short service life, serious metal loss and other problems, which seriously affects the control of the direct recovery rate index of the anode furnace and the improvement of the process control level and economic benefits of enterprises.

[0003] Therefore, the prior art still needs to be improved and developed. SUMMARY

[0004] In view of the above problems in the prior art, the purpose of the present application is to provide a method for improving the direct recovery rate of copper in an anode furnace, which aims to solve the problem of low direct recovery rate of the anode furnace caused by serious metal loss in the process of producing anode plates in the existing copper smelting anode furnace.

[0005] The technical scheme of the present application is as follows:

[0006] A method for improving the direct recovery rate of copper in an anode furnace, comprising the steps of:

[0007] pouring the crude copper into the anode furnace to obtain first copper liquid;

[0008] sequentially performing oxidation treatment and reduction treatment on the first copper liquid to obtain second copper liquid, and controlling the chemical composition, predetermined temperature and predetermined oxygen content of the second copper liquid;

[0009] performing one-time tapping of the second copper liquid through a copper liquid flow control device installed on the copper tapping opening of the anode furnace in cooperation with the copper tapping chute to realize the improvement of the direct recovery rate of copper in the anode furnace;

[0010] wherein the angle of the one-time tapping is-78° to-82°, and the height difference between the copper tapping opening and the copper tapping chute is within 500 mm.

[0011] The method for improving the direct recovery rate of copper in the anode furnace, wherein the predetermined temperature is 1220℃ to 1260℃, and the predetermined oxygen content is 1400ppm or less.

[0012] The method for improving the direct copper recovery rate of the anode furnace, wherein the chemical composition of the second copper liquid, by mass percentage, includes: Cu ≥ 99.1%, As ≤ 0.30%, Ni ≤ 0.25%, Bi ≤ 0.05%, Sb ≤ 0.15%, and Pb ≤ 0.20%.

[0013] The method for improving the direct copper recovery rate of the anode furnace, wherein the crude copper is high-grade copper matte, and the copper content of the high-grade copper matte is ≥98.5%.

[0014] The method for improving the direct copper recovery rate of an anode furnace includes a copper liquid flow control device comprising a mounting plate component, a door frame component, a sliding component, a hydraulic cylinder assembly, and a cooling assembly; the mounting plate component and the door frame component are rotatably connected by a pivot pin; the sliding component is disposed between the mounting plate component and the door frame component and is used to control the flow rate of the second copper liquid; the hydraulic cylinder assembly is used to control the sliding component; and the cooling assembly is used to cool the copper liquid flow control device.

[0015] The method for improving the direct copper recovery rate of an anode furnace includes a sliding component comprising two perforated sliding plate bricks; an upper water inlet brick is provided on the mounting plate component and extends through the mounting plate component; a lower water inlet brick is provided on the door frame component and extends through the door frame component; the upper water inlet brick, the two perforated sliding plate bricks, and the lower water inlet brick form a casting channel.

[0016] The method for improving the direct copper recovery rate in the anode furnace, wherein the concentricity of the casting channel is within ±5mm.

[0017] The method for improving the direct copper recovery rate of an anode furnace includes a cylinder assembly comprising a cylinder support, a cylinder, and a connecting seat; the cylinder is fixed to the end of the connecting seat away from the mounting plate component; one end of the cylinder support is connected to the connecting seat, and the other end is connected to the sliding component.

[0018] The method for improving the direct copper recovery rate of an anode furnace, wherein the copper outlet chute is made of a mixture of corundum-spinel and an anti-seepage agent.

[0019] The method for improving the direct copper recovery rate of the anode furnace, wherein the direct copper recovery rate of the anode furnace is above 95.5%.

[0020] Beneficial effects: the present application provides a method for improving the direct recovery rate of anode furnace copper, comprising the steps of: pouring crude copper into an anode furnace to obtain a first copper liquid; sequentially performing oxidation treatment and reduction treatment on the first copper liquid to obtain a second copper liquid; and controlling the chemical composition, predetermined temperature and predetermined oxygen content of the second copper liquid; the second copper liquid is discharged through the copper liquid flow control device installed on the copper discharge port of the anode furnace in cooperation with the copper discharge channel to realize one-time shaking furnace discharge, so as to improve the direct recovery rate of the anode furnace copper; wherein the angle of one-time shaking furnace discharge is-78° to-82°, and the height difference between the copper discharge port and the copper discharge channel is within 500mm. The present application controls the predetermined temperature, predetermined oxygen content and chemical composition of the second copper liquid after oxidation treatment and reduction treatment of the first copper liquid, so as to ensure that the copper liquid has good flow characteristics and chemical quality, realize good separation of copper slag, and avoid chemical quality defects of anode plate; then the copper liquid flow control device is used in cooperation with the copper discharge channel to realize one-time shaking furnace discharge, which can minimize the height difference between the copper discharge port of the anode furnace and the copper discharge channel, maximize the improvement of copper liquid spattering and copper liquid sticking in the copper discharge channel during the copper discharge process, thereby reducing metal loss and improving the direct recovery rate of the anode furnace copper. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a process flow diagram of the method for improving the direct recovery rate of anode furnace copper of the present application;

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of the anode furnace used in the method for improving the direct recovery rate of anode furnace copper of the present application;

[0023] Figure 3 It is a sectional view of Figure 2 ;

[0024] Figure 4 It is a partial enlarged view of Figure 3 ;

[0025] Figure 5 It is a structural diagram of the copper liquid flow control device in the present application;

[0026] Figure 6 It is a top view of the copper liquid flow control device in the present application;

[0027] Figure 7 It is a sectional view of the copper liquid flow control device in the present application;

[0028] BRIEF DESCRIPTION OF DRAWINGS: anode furnace 100, copper liquid flow control device 200, copper discharge channel 300, mounting plate component 10, door frame component 20, door frame support 21, sliding component 30, pouring channel 31, oil cylinder assembly 40, oil cylinder support 41, oil cylinder 42, connecting seat 43, inner rod 44, fastening structure 45, cooling assembly 50, door closing oil cylinder 60. DETAILED DESCRIPTION

[0029] The present application provides a method for improving the direct recovery rate of copper in an anode furnace. To make the purpose, technical solutions and effects of the present application clearer and more explicit, the present application is further described in detail below. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0030] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood in the context of the prior art and should not be interpreted in an idealized or overly formal sense unless specifically defined as such herein.

[0031] The present application provides a method for improving the direct recovery rate of copper in an anode furnace, comprising the steps of:

[0032] Step S100: pouring the crude copper into the anode furnace to obtain a first copper liquid;

[0033] Step S200: sequentially performing oxidation treatment and reduction treatment on the first copper liquid to obtain a second copper liquid; and controlling the chemical composition, predetermined temperature and predetermined oxygen content of the second copper liquid;

[0034] Step S300: pouring the second copper liquid through a copper liquid flow control device installed on a copper outlet of the anode furnace in combination with a copper pouring channel to realize one-time shaking furnace copper pouring, thereby improving the direct recovery rate of copper in the anode furnace;

[0035] The angle of the one-time shaking furnace copper pouring is -78° to -82°, and the height difference between the copper outlet and the copper pouring channel is within 500 mm.

[0036] In the embodiment, the crude copper is melted into a first copper liquid, and then the first copper liquid is subjected to oxidation treatment and reduction treatment in sequence to obtain a second copper liquid, and the second copper liquid has a certain temperature, chemical composition and oxygen content, so that the copper liquid has good flow characteristics and chemical quality, copper slag is well separated, and chemical quality defects of the anode plate are avoided. Then, the second copper liquid is subjected to one-time rocking furnace copper tapping by using a copper liquid flow control device 200 installed on a copper tapping opening of the anode furnace 100 in cooperation with a copper tapping channel 300, and the angle of the one-time rocking furnace copper tapping is controlled to be-78° to-82°, and the height difference between the copper tapping opening and the copper tapping channel is within 500 mm, so that the height difference between the copper tapping opening of the anode furnace and the channel is minimized, copper liquid spattering and copper liquid sticking in the channel during the copper tapping are obviously improved, metal loss is reduced, and the direct recovery rate of the anode copper is greatly improved. Moreover, the method for improving the direct recovery rate of the anode furnace has clear process ideas and simple equipment structure.

[0037] Specifically, the method for improving the direct recovery rate of the anode furnace makes the copper liquid in the anode furnace have a certain temperature, chemical composition and oxygen content through oxidation and reduction operations, so that impurity elements in the copper liquid are effectively removed and copper slag is well separated, the copper liquid has good flowability and chemical quality, and chemical quality defects of the copper anode plate are avoided. Meanwhile, the copper liquid flow control device installed on the copper tapping opening of the copper anode furnace is used in cooperation with the copper tapping channel, one-time rocking furnace copper tapping can be realized, the height difference between the copper tapping opening position of the anode furnace and the channel is minimized, metal loss caused by copper liquid spattering and copper liquid sticking in the channel during the copper tapping is improved, and the copper liquid slag inclusion phenomenon is completely solved, so that the method is an effective process and technical method for improving the direct recovery rate of the anode furnace.

[0038] In some embodiments, the capacity of the anode furnace in the step S100 is 350-380 t.

[0039] In some embodiments, in the step S300, the angle of the one-time rocking furnace copper tapping is controlled to be-78° to-82°, and the height difference between the copper tapping opening and the copper tapping channel is within 500 mm, so that the number of times of copper tapping rocking is changed from the traditional 15 times of gradual rocking to one-time rocking (limit position), the height difference between the copper tapping opening position and the channel during the copper tapping is minimized, the amount of copper liquid spattering during the copper tapping is minimized, and the separation of copper slag is best. Moreover, the height difference between the copper tapping opening and the copper tapping channel is within 500 mm, which is 1500 mm shorter than the original mode.

[0040] In some embodiments, the predetermined temperature is 1220-1260℃; the predetermined oxygen content (mass percentage of oxygen in the copper liquid) is 1400ppm (0.14%) or less; and the temperature of the second copper liquid after the first copper liquid is subjected to oxidation and reduction treatment is controlled to be 1220-1260℃, and the oxygen content is controlled to be 0.14% or less, so that the copper liquid has good flow characteristics, and the impurity elements in the copper liquid can be effectively removed and the copper slag can be well separated.

[0041] In some preferred embodiments, the predetermined temperature is 1240-1260℃; the copper liquid in this temperature range has good flow characteristics.

[0042] In some embodiments, the chemical composition (mass percentage of metal elements in the copper liquid) of the second copper liquid includes, in terms of mass percentage, Cu≥99.1%, As≤0.30%, Ni≤0.25%, Bi≤0.05%, Sb≤0.15%, and Pb≤0.20%; and the chemical composition of the second copper liquid is controlled to be within the above range, so that the chemical quality of the copper liquid is ensured and the chemical quality defects of the copper anode plate are avoided.

[0043] In some embodiments, the blister copper is high-grade copper matte produced by a converter, and the copper content of the high-grade copper matte is ≥98.5%.

[0044] In some embodiments, the copper liquid flow control device includes a mounting plate component 10, a door frame component 20, a sliding component 30, an oil cylinder assembly 40, and a cooling assembly 50; the mounting plate component 10 and the door frame component 20 are rotationally connected through a shaft pin; the sliding component 30 is arranged between the mounting plate component 10 and the door frame component 20 and is used to control the flow of the second copper liquid; the oil cylinder assembly 40 is used to control the sliding component 30; and the cooling assembly 50 is used to cool the copper liquid flow control device.

[0045] Specifically, the door frame component 20 is provided with a door frame support 21 near one end of the shaft pin, two first hinge holes are formed in one end of the door frame component 20 near the door frame support 21, and the door frame support 21 is connected with the two first hinge holes through a shaft pin; at the same time, two second hinge holes are formed in one end of the mounting plate component 10 near the door frame support 21, and the door frame support 21 is connected with the two second hinge holes through a shaft pin, so as to rotationally connect the mounting plate component 10 and the door frame component 20 through a shaft pin. This structure can change the door opening direction of the copper liquid flow control device from the original vertical direction to the horizontal direction, so as to effectively reduce the space occupied by the device when the door is opened.

[0046] In some embodiments, the sliding component 30 comprises two sliding plate bricks with matching openings; the installation plate component is provided with an upper water inlet brick, and the upper water inlet brick is arranged through the installation plate component; the door frame component is provided with a lower water inlet brick, and the lower water inlet brick is arranged through the door frame component; the upper water inlet brick, the two sliding plate bricks with matching openings and the lower water inlet brick form a casting channel 31. The sliding component 30 is driven by the oil cylinder assembly 40 to make reciprocating motion, thereby driving the sliding plate bricks to slide back and forth to adjust the opening size of the casting channel, so as to achieve the purpose of precisely controlling the flow of the copper liquid in the anode furnace.

[0047] In some preferred embodiments, the two sliding plate bricks with matching openings are respectively an upper sliding plate brick and a lower sliding plate brick; the middle part of the door frame component is provided with an upper sliding plate cavity for installing the upper sliding plate brick, and the middle part of the installation plate component 10 is provided with a lower sliding plate cavity for installing the lower sliding plate brick; the sliding component 30 is driven by the oil cylinder assembly 40 to make reciprocating motion, thereby driving the lower sliding plate brick to slide back and forth to adjust the opening size of the casting channel, so as to achieve the purpose of precisely controlling the flow of the copper liquid in the anode furnace (the opening size range is 0-100%).

[0048] In some embodiments, the concentricity of the casting channel is within ±5 mm; by controlling the concentricity of the casting channel within ±5 mm, the flow of the copper liquid in the anode furnace can be accurately controlled.

[0049] In some embodiments, the oil cylinder assembly 40 comprises an oil cylinder support 41, an oil cylinder 42 and a connecting seat 43; the oil cylinder 42 is fixed at one end of the connecting seat 43 away from the installation plate component 10; one end of the oil cylinder support 41 is connected with the connecting seat 43, and the other end is connected with the sliding component 30.

[0050] Specifically, the oil cylinder support 41 is provided with an inner rod 44; one end of the inner rod 44 is connected with the sliding component 30, and the other end is in abutment with the oil cylinder 42; the movement of the inner rod can be controlled by the oil cylinder 42, so as to realize the control of the sliding component, and further precisely control the flow of the copper liquid in the anode furnace. The oil cylinder 42 and the oil cylinder support 41 are indirectly connected through the connecting seat 43; the connection between the oil cylinder support 41 and the oil cylinder 42 is provided with a fastening structure 45 composed of two L-shaped limiting blocks, which further fixes the connection, prevents misplacement during pressurization and ensures the safety of the working process.

[0051] In some embodiments, the copper liquid flow control device further comprises a door closing oil cylinder 60, which is arranged on the door frame component 20 and is pressurized when the copper liquid flow control device is closed.

[0052] In some embodiments, the main component of the copper tapping channel is a mixture of corundum-spinel and a permeation inhibitor; the copper tapping channel made of corundum-spinel and containing a certain amount of permeation inhibitor has good anti-copper slag erosion performance, anti-copper liquid permeation performance and anti-bonding performance, which can effectively reduce the bonding of copper liquid on the channel during the copper tapping process and reduce metal loss.

[0053] In some embodiments, the anode furnace copper direct recovery rate (the ratio of the amount of copper element metal in the anode plate to the amount of copper element metal in the material entering the furnace) is above 95.5%, and the method for improving the anode furnace copper direct recovery rate can greatly improve the anode furnace copper direct recovery rate, which can be above 95.5%.

[0054] In some embodiments, the method for improving the anode furnace copper direct recovery rate comprises the following steps:

[0055] The blister copper produced by the copper smelting and blowing furnace is poured into the anode furnace by a 50-ton crane, natural gas is burned by a natural gas combustion system to heat and warm the copper liquid, compressed air is introduced into the furnace to make the melt fully react to remove impurity elements, and a reducing agent is blown in during the reduction stage to deoxidize, so that the copper liquid has a certain temperature, chemical composition and oxygen content, and the good flow characteristics and chemical quality of the copper liquid are ensured.

[0056] The well-operated copper liquid is realized one-time tapping by a copper liquid control device installed on the copper tapping port of the anode furnace and a copper tapping channel, the height difference between the anode furnace copper tapping port and the channel is minimized during the copper tapping, the copper liquid spattering and the copper liquid bonding in the channel during the copper tapping are improved, the metal loss is reduced, and the anode furnace copper direct recovery rate is improved.

[0057] The following examples are further provided to illustrate the present application. It should be understood that the following examples are only used to further illustrate the present application, and cannot be understood as limiting the protection scope of the present application. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present application are within the protection scope of the present application.

[0058] Example 1

[0059] The present embodiment provides a method for improving the anode furnace copper direct recovery rate, which comprises the following steps:

[0060] S1, the high-grade blister copper produced by the blowing furnace contains 98.86% of copper, which is poured into the 6# rotary anode furnace by a 50-ton crane, and the feeding amount is 360.2 tons.

[0061] S2, the air volume-tilting angle linkage control is started, the oxidation operation is carried out, and the oxidation time is 60 min.

[0062] S3, the air volume-tilting angle linkage control is started, the reduction operation is carried out, and the reduction time is 90 min.

[0063] S4, at the end of reduction, the temperature of the copper water is measured as 1248℃.

[0064] S5, the copper water is sampled for component detection analysis, and the chemical components are detected as containing Cu: 99.24%, As: 0.14%, Ni: 0.15%, Bi: 0.04%, Sb: 0.09%, Pb: 0.12%.

[0065] S6, the anode furnace is shaken to -79° for copper tapping operation. It is measured that the height difference between the anode furnace copper tapping port and the launder is 490mm, and the copper liquid spatter is less.

[0066] S7, the copper liquid is taken for oxygen content detection, and the copper liquid oxygen content is detected as 1214.29ppm.

[0067] S8, there is no obvious copper liquid bonding in the copper tapping launder, the copper liquid flowability is good, the launder structure is complete, the copper tapping time is 320min, and the anode copper yield is 346.5 tons.

[0068] It is calculated that the copper direct recovery rate of the present furnace is 96.56%.

[0069] According to the above, the method for improving the direct recovery rate of the anode furnace copper provided by the present application comprises the following steps: pouring the crude copper into the anode furnace, heating treatment to obtain the first copper liquid; sequentially performing oxidation treatment and reduction treatment on the first copper liquid to obtain the second copper liquid; controlling the second copper liquid at a predetermined temperature and a predetermined oxygen content; and one-time shaking furnace copper tapping of the second copper liquid through the copper liquid flow control device installed on the copper tapping port of the anode furnace and the copper tapping launder, so as to improve the direct recovery rate of the anode furnace copper; wherein the one-time shaking furnace copper tapping angle is -78° to -82°, and the height difference between the copper tapping port and the copper tapping launder is within 500mm. The present application controls the predetermined temperature, the predetermined oxygen content and the chemical components of the second copper liquid by performing oxidation treatment and reduction treatment on the first copper liquid, so as to ensure that the copper liquid has good flow characteristics and chemical quality, realize good separation of copper slag, avoid chemical quality defects of the anode plate, and then realize one-time shaking furnace copper tapping through the copper liquid flow control device and the copper tapping launder, which can minimize the height difference between the copper tapping port of the anode furnace and the copper tapping launder, greatly improve the copper liquid spatter and the copper liquid bonding phenomenon in the copper tapping process, thereby reducing the metal loss and improving the direct recovery rate of the anode furnace copper.

[0070] It should be understood that the application of the present application is not limited to the above examples, and those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

Claims

1. A method of improving the direct copper yield of an anode furnace, characterized in that, The method comprises the steps of: pouring the crude copper into an anode furnace to obtain a first copper liquid; sequentially performing oxidation treatment and reduction treatment on the first copper liquid to obtain a second copper liquid; controlling the chemical composition, predetermined temperature and predetermined oxygen content of the second copper liquid; cooperating with a copper liquid flow control device installed on a copper outlet of the anode furnace to realize one-time shaking-out of the copper through a copper shaking-out channel to improve the direct recovery rate of the anode furnace copper; wherein the angle of the one-time shaking-out of the copper is-78°~-82°, and the height difference between the copper outlet and the copper shaking-out channel is within 500mm; the predetermined temperature is 1220℃~1260℃; the predetermined oxygen content is 1400ppm or less; the chemical composition of the second copper liquid comprises, by mass percentage, Cu≥99.1%, As≤0.30%, Ni≤0.25%, Bi≤0.05%, Sb≤0.15%, Pb≤0.20%; the crude copper is high-grade copper matte, and the copper content of the high-grade copper matte is≥98.5%; the copper liquid flow control device comprises a mounting plate component, a door frame component, a sliding component, an oil cylinder assembly and a cooling assembly; the mounting plate component and the door frame component are rotationally connected through a shaft pin; the sliding component is arranged between the mounting plate component and the door frame component and is used for controlling the flow of the second copper liquid; the oil cylinder assembly is used for controlling the sliding component; and the cooling assembly is used for cooling the copper liquid flow control device; one end of the door frame component close to the shaft pin is provided with a door frame support, two first hinge holes are formed in one end of the door frame component close to the door frame support, and the door frame support and the two first hinge holes are connected through a shaft pin; two second hinge holes are formed in one end of the mounting plate component close to the door frame support, and the door frame support and the two second hinge holes are connected through a shaft pin; the material of the copper shaking-out channel is a mixture of corundum-spinel and a permeation inhibitor; and the direct recovery rate of the anode furnace copper is 95.5% or more.

2. The method of increasing the copper direct recovery of a pregnant anode furnace according to claim 1, wherein, the sliding component comprises two sliding plate bricks with matching openings; an upper water inlet brick is arranged on the mounting plate component and penetrates through the mounting plate component; a lower water inlet brick is arranged on the door frame component and penetrates through the door frame component; and the upper water inlet brick, the two sliding plate bricks with matching openings and the lower water inlet brick form a casting channel.

3. The method of claim 2, wherein the copper recovery is increased by at least 1.5% by weight. the concentricity of the casting channel is within ±5mm.

4. The method of increasing the copper direct recovery of a pregnant anode furnace according to claim 1, wherein, the oil cylinder assembly comprises an oil cylinder support, an oil cylinder and a connecting seat; the oil cylinder is fixed at one end of the connecting seat away from the mounting plate component; one end of the oil cylinder support is connected with the connecting seat, and the other end is connected with the sliding component.

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