A method for refining complex copper materials for anode plate production and a refining furnace

Abstract

The application discloses a method for complex copper material mixing refining for anode plate production and a refining furnace, and relates to the technical field of non-ferrous metallurgy, comprising a rotary furnace for producing anode plates, wherein a sealing ring is arranged on the rotary furnace, and a sealing plate is arranged on the sealing ring; after the sealing plate is removed, cold materials are added into the furnace through the gap; the application solves the problem that the smelting of copper matte to anode plates is completed in two furnaces, and solves the problems of feeding and heat balance control in the smelting process of complex copper materials; the relationship between the oxidizing gas and the melt is controlled; the oxygen content and the sulfur content of the melt reach the target of impurity removal of the mixed materials.

Description

Technical Field

[0001] This invention relates to the field of non-ferrous metal metallurgy technology, and in particular to a method and refining furnace for mixing and refining complex copper materials used in anode plate production. Background Technology

[0002] The production of anode plates from matte involves copper smelting, with matte having a purity of 60-73%. After matte production, a blowing process produces blister copper with a purity of 95-99%. This blister copper is then further oxidized in a refining furnace to remove trace elements, and reduced to obtain anode plates that meet physical and chemical requirements, with a purity ≥99%. The commonly used process for producing anode copper from matte involves a Ps converter, flash blowing furnace, or continuous blowing furnace combined with a rotary refining furnace. This process requires two steps: after producing blister copper from matte, it needs to be transferred to the refining furnace for further oxidation and reduction. This process is characterized by discontinuity, high energy consumption, and pollution.

[0003] The production of anode plates from complex copper materials generally requires the dismantling, classification, and cutting of materials, which are then smelted in different processes according to their grade. Currently, the commonly used processes are reverberatory furnaces, NGL furnaces, and Kaldor furnaces. These processes have problems such as high energy consumption, single smelting materials, high smelting costs, and difficulty in solving environmental problems. The key issue is that individual smelting cannot utilize the excess heat in the copper blowing process, resulting in energy waste. Summary of the Invention

[0004] In view of the problems existing in the above-mentioned technologies, the present invention proposes a method and refining furnace for mixing and refining complex copper materials for anode plate production.

[0005] The present invention addresses the aforementioned technical problems by providing the following technical solution: a method for mixing and refining complex copper materials used in anode plate production, comprising the following steps:

[0006] S1. Hot matte material is added into the converter through the matte guide pipe, while complex cold copper material is added into the converter through the flue via the opening and closing mechanism.

[0007] S2. Oxygen, air and combustion-supporting natural gas are introduced into the converter, and the sulfur dioxide and other gases produced enter the flue gas treatment device in gaseous form.

[0008] S3. The waste gas reacts with the added quartz flux to complete the slag-forming process. After the slag-forming is completed, the slag is discharged from the converter through the slag discharge port.

[0009] S4. Enter the deep oxidation reaction impurity removal process, fine-tune the converter, raise the height of the spray gun from the bottom of the melt to ensure that the spray gun is always immersed in the matte area;

[0010] S5. When Cu2S is oxidized, the matte phase disappears, and the remaining Cu2S in the converter dissolves into the crude copper. Subsequently, deep oxidation is carried out, and the S content of the crude copper gradually decreases.

[0011] S6. When the copper content of the melt is close to 98.5% or the oxygen content is 0.55%, stop the oxidation and switch to the reduction stage. At the end of the reduction, keep the oxygen content of the melt below 0.05%. At this time, the quality of the anode plate reaches more than 99%.

[0012] Furthermore, a refining furnace for mixing and refining complex copper materials in anode plate production includes a base, a rotating frame rotatably mounted on the base, a converter rotatably mounted on the rotating frame, a sealing ring mounted on the converter, the converter and the sealing ring being intermittently connected, an opening and closing mechanism mounted on the sealing ring, a feed cylinder mounted on the rotating frame, the feed cylinder being rotatably connected to the slag discharge port, and a flue gas treatment device mounted on the side of the base, the flue gas treatment device being connected to the sealing ring via a flexible hose.

[0013] Furthermore, the feed cylinder is provided with a feed inlet, and when the converter rotates, the height of the melt inside the converter relative to the end of the feed inlet remains unchanged.

[0014] Furthermore, the opening and closing mechanism includes a sealing hydraulic cylinder that is slidably mounted on a sealing ring. A sealing plate is provided at the movable end of the sealing hydraulic cylinder, and a gear is rotatably mounted on the sealing hydraulic cylinder. The gear meshes with teeth and is mounted on the sealing ring.

[0015] Furthermore, the sealing ring has two notches, the inner notch of the sealing ring is connected to the converter intermittently, and the sealing plate intermittently fits the outer notch of the sealing ring.

[0016] Furthermore, the furnace bricks at the location where the converter communicates with the sealing ring are reinforced to prevent physical damage caused by hot material flowing in and cold material being added.

[0017] Furthermore, the converter is equipped with multiple sets of spray guns, and a water jacket is installed at the location where the spray guns are located. The water jacket operates under negative pressure.

[0018] Furthermore, the converter is equipped with a slag discharge port and a copper tapping port.

[0019] Furthermore, the slag discharge port is located in the settling area and is at least one meter away from the converter end and the spray gun.

[0020] Furthermore, the converter is set with an inclination angle of ≥6°.

[0021] The beneficial effects of this invention compared with the prior art are as follows: This invention solves the problem of completing the smelting of matte to anode plates in two furnaces. This invention combines the functions of two furnaces into one furnace, realizing the integration of blowing and refining, and achieving the goal of producing anode plates from matte in one step. This invention optimizes the furnace structure and improves the gas supply mechanism, solving the damage to the furnace body caused by the addition of large pieces of material and the impact on the melt temperature after addition. By controlling the relationship between the introduced oxidizing gas and the melt, the goal of removing impurities from the mixed materials is achieved by controlling the oxygen and sulfur content of the melt. Attached Figure Description

[0022] Figure 1 This is a left view of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 3 This is a schematic diagram showing the installation position of the flue gas treatment device and the sealing ring of the present invention.

[0025] Figure 4 This is a cross-sectional view of the overall structure of the present invention.

[0026] Figure 5 This is a schematic diagram showing the installation positions of the sealing ring and the sealing hydraulic cylinder of the present invention.

[0027] Figure 6 This is a cross-sectional view of the sealing ring structure of the present invention.

[0028] Reference numerals in the attached drawings: 1-base; 2-rotating hydraulic cylinder; 3-rotating frame; 4-feed cylinder; 5-feed inlet; 6-converter; 7-slag discharge port; 8-drive wheel; 9-sealing hydraulic cylinder; 10-flue gas treatment device; 11-copper outlet; 12-sealing ring; 13-spray gun; 14-gear; 15-tooth; 16-sealing plate. Detailed Implementation

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] refer to Figures 1 to 6 The method for mixing and refining complex copper materials for anode plate production and the refining furnace for anode plate production are shown. The furnace includes a converter 6 for producing anode plates, a sealing ring 12 is provided on the converter 6, a sealing plate 16 is provided on the sealing ring 12, and multiple sets of spray guns 13 are provided on the converter 6.

[0031] A refining furnace for mixing and refining complex copper materials in anode plate production includes a base 1. A rotating frame 3 and a rotating hydraulic cylinder 2 are rotatably mounted on the base 1. The movable end of the rotating hydraulic cylinder 2 is rotatably connected to the rotating frame 3. When the rotating hydraulic cylinder 2 is activated, it drives the rotating frame 3 to rotate on the base 1. A feed cylinder 4 and a drive wheel 8 are mounted on the rotating frame 3. A feed inlet 5 and a converter 6 are mounted on the feed cylinder 4. When the converter 6 rotates, the height of the molten material inside and the end of the feed inlet 5 remains constant to prevent material overflow due to the rotation of the converter 6. When the situation occurs, the converter 6 is in contact with the drive wheel 8. When the drive wheel 8 is started, it drives the converter 6 to rotate on the feed cylinder 4 and the rotating frame 3. The end of the converter 6 away from the feed cylinder 4 is provided with a slag discharge port 7 and a copper outlet 11. The slag discharge port 7 is located in the settling area and is more than one meter away from the end of the converter 6 and the spray gun 13. The copper outlet is more than 300 mm away from the end furnace brick. The produced anode copper is discharged through the copper outlet 11 and cast into anode plates. There are multiple sets of spray guns 13 inside the converter 6. The positions of the spray guns 13 in the converter 6 are set as follows: A water jacket is provided, operating under negative pressure to prevent safety issues caused by leakage of circulating cooling water. A sealing ring 12 is also installed on the rotating frame 3, rotatably connected to the converter 6. The sealing ring 12 is connected to the flue gas treatment device 10 via a flexible hose. Two notches are provided inside the sealing ring 12. A vent is provided on the converter 6, intermittently aligned with the notches inside the sealing ring 12. The furnace bricks at the communication points between the converter 6 and the sealing ring 12 are reinforced to prevent physical damage caused by hot material flow and cold material addition. A sealing hydraulic cylinder 9 is slidably mounted on the sealing ring 12. A sealing plate 16 is mounted on the movable end of the sealing hydraulic cylinder 9. The sealing plate 16 intermittently fits with the outer notch of the sealing ring 12. A moving motor is mounted on the sealing hydraulic cylinder 9. A gear 14 is mounted on the output shaft of the moving motor. The gear 14 meshes with teeth 15. Teeth 15 are mounted on the sealing ring 12. When the sealing plate 16 does not fit with the outer notch on the sealing ring 12, material is fed into the converter 6 through the notch on the sealing ring 12. The converter 6 is set with an inclination angle of ≥6°.

[0032] A method for mixing and refining complex copper materials for anode plate production includes the following steps: S1, hot matte material is added into converter 6 through a matte pipe, while cold complex copper material is added into converter 6 through an opening and closing mechanism at the flue.

[0033] S2. Oxygen, air and combustion-supporting natural gas are introduced into converter 6, and the generated sulfur dioxide and other gases enter the flue gas treatment device 10 in gaseous form.

[0034] S3. The waste gas reacts with the added quartz flux to complete the slag-forming process. After the slag-forming is completed, the slag is discharged from the converter 6 through the slag discharge port 7.

[0035] S4. Enter the deep oxidation reaction impurity removal process, fine-tune converter 6, raise the height of spray gun 13 from the bottom of the melt, and ensure that spray gun 13 is always immersed in the matte area.

[0036] S5. When Cu2S is oxidized, the matte phase disappears, and the remaining Cu2S in converter 6 dissolves into the crude copper, which then undergoes deep oxidation, gradually reducing the S content in the crude copper.

[0037] S6. When the copper content of the melt is close to 98.5% or the oxygen content is 0.55%, stop the oxidation and switch to the reduction stage. At the end of the reduction, keep the oxygen content of the melt below 0.05%. At this time, the quality of the anode plate reaches more than 99%.

[0038] Working principle: Hot matte material is added into converter 6 through the matte guide pipe, while complex cold copper material is added into the furnace through the flue through the sealing ring 12. The amount of cold material added and the amount of gas supplied must be matched.

[0039] When complex copper cold material needs to be added into converter 6, the sealing hydraulic cylinder 9 is activated. The sealing hydraulic cylinder 9 drives the sealing plate 16 to disengage from the sealing ring 12. At the same time, the converter 6 is rotated so that the internal notch of the converter 6 and the sealing ring 12 are aligned. Then, the moving motor on the sealing hydraulic cylinder 9 is activated. The moving motor drives the gear 14 to rotate. The gear 14 rotates on the teeth 15. The gear 14 drives the sealing hydraulic cylinder 9 and the sealing plate 16 to slide on the sealing ring 12, opening the external notch on the sealing ring 12. Then, complex copper cold material is added into converter 6 through the sealing ring 12.

[0040] When the angle of converter 6 needs to be adjusted, the rotating hydraulic cylinder 2 is activated. The rotating hydraulic cylinder 2 pushes the rotating frame 3 to rotate on the base 1, so that the rotating frame 3 drives the converter 6 to deflect on the base 1.

[0041] The gas outlet of the spray gun 13 is located 100mm above the surface of the molten copper at the anode. The gas outlet of the spray gun 13 intersects with the surface of the molten metal at an angle of 11.25-16°, which meets the requirement that the gas is fully utilized.

[0042] In the refining process control of the mixed materials, the first step is the melting stage. During this stage, oxygen, air, and combustion-supporting natural gas are introduced. In this stage, there is an excess of oxygen. The excess oxygen reacts with Fe, S, and other sulfides in the complex materials to generate oxides. Sulfur dioxide and other substances enter the flue in gaseous form. Among them, FeS is first oxidized to FeO and reacts with the added quartz flux to complete the slag-forming process. After the slag-forming is completed, the slag is discharged from the furnace through the slag discharge port 7. The slag-forming process ends and the process transitions to the deep oxidation reaction and impurity removal process. During this process, as the oxygen content increases, the Cu2S in the melt continuously decreases and the Cu content continuously increases. As copper production continues, the converter 6 needs to be finely adjusted to raise the spray gun 13 to the height of the bottom of the melt, ensuring that the spray gun 13 is always immersed in the matte zone.

[0043] During the critical copper production period, the copper production temperature is maintained at T=1523K (1250℃). In the early stage of copper production, Cu2S in the matte begins to oxidize to form Cu, but the amount of Cu is small and it all dissolves into the white matte. In the middle stage of copper production, Cu2S is oxidized in large quantities to form Cu, and the matte dissolves Cu to saturation. Cu precipitates out as the crude copper phase. The crude copper has a certain solubility for Cu2S. Since there is sufficient white matte in converter 6, the crude copper dissolves Cu2S to saturation, that is, the crude copper contains about 1% S. As Cu2S oxidizes, the matte phase disappears, and the remaining Cu2S in converter 6 dissolves into the crude copper. With the deep oxidation, the S content of the crude copper gradually decreases until the product is pure copper.

[0044] As pure copper continues to be oxidized, Cu is oxidized to Cu2O. To prevent the formation of Cu2O, the oxidation process must be stopped and the amount of reducing gas increased.

[0045] When the copper content in the melt is close to 98.5% or the oxygen content is 0.55%, oxidation is stopped and the reduction stage begins. The reduction endpoint is maintained with the oxygen content in the melt being less than 0.05%. At this point, the quality of the anode plate reaches over 99%. The produced anode copper is discharged through the copper outlet and cast into anode plates.

[0046] This invention is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort are within the protection scope of this invention.

Claims

1. A method for mixing and refining complex copper materials for anode plate production, characterized in that, Includes the following steps: S1. Hot matte material is added into converter (6) through matte pipe, while complex cold copper material is added into converter (6) through opening and closing mechanism at flue. S2. Oxygen, air and combustion-supporting gas natural gas are introduced into the converter (6), and the generated sulfur dioxide enters the flue gas treatment device (10) in gaseous form. S3. The waste gas reacts with the added quartz flux to complete the slag-making process. After the slag-making is completed, the slag is discharged from the converter (6) through the slag discharge port (7). S4. Enter the deep oxidation reaction impurity removal process, fine-tune the converter (6), raise the height of the spray gun (13) from the bottom of the melt, and ensure that the spray gun (13) is always immersed in the matte area. S5. When Cu2S is oxidized, the matte phase disappears, and the remaining Cu2S in the converter (6) dissolves into the crude copper, which is then subjected to deep oxidation, and the S content of the crude copper gradually decreases. S6. When the copper content of the melt is 98.5% or the oxygen content is 0.55%, stop the oxidation and switch to the reduction stage. At the end of the reduction, keep the oxygen content of the melt less than 0.05%. At this time, the quality of the anode plate reaches more than 99%.

2. A refining furnace for mixing and refining complex copper materials in anode plate production using the method described in claim 1, characterized in that: The system includes a base (1), a rotating frame (3) rotatably mounted on the base (1), a converter (6) rotatably mounted on the rotating frame (3), a sealing ring (12) mounted on the converter (6), the converter (6) and the sealing ring (12) being intermittently connected, an opening and closing mechanism being mounted on the sealing ring (12), a feed cylinder (4) mounted on the rotating frame (3), the feed cylinder (4) being rotatably connected to the slag discharge port (7), and a flue gas treatment device (10) mounted on the side of the base (1), the flue gas treatment device (10) being connected to the sealing ring (12) via a flexible hose.

3. The refining furnace for mixing and refining complex copper materials in anode plate production according to claim 2, characterized in that: The feed cylinder (4) is provided with a feed inlet (5). When the converter (6) rotates, the height of the melt inside the converter (6) and the end of the feed inlet (5) remains unchanged.

4. The refining furnace for mixing and refining complex copper materials in anode plate production according to claim 3, characterized in that: The opening and closing mechanism includes a sealing hydraulic cylinder (9) that is slidably mounted on a sealing ring (12). A sealing plate (16) is provided on the movable end of the sealing hydraulic cylinder (9). A gear (14) is rotatably mounted on the sealing hydraulic cylinder (9). The gear (14) meshes with teeth (15). The gear (14) is mounted on the sealing ring (12).

5. A refining furnace for mixing and refining complex copper materials in anode plate production according to claim 4, characterized in that: The sealing ring (12) has two notches. The inner notch on the sealing ring (12) is intermittently connected to the converter (6), and the sealing plate (16) is intermittently fitted with the outer notch on the sealing ring (12).

6. A refining furnace for mixing and refining complex copper materials in anode plate production according to claim 5, characterized in that: The furnace bricks at the position where the converter (6) communicates with the sealing ring (12) are reinforced to prevent physical damage caused by hot material flowing in and cold material being added.

7. A refining furnace for mixing and refining complex copper materials in anode plate production according to claim 2, characterized in that: The converter (6) is equipped with multiple sets of spray guns (13), and a water jacket is provided at the position where the spray guns (13) are located on the converter (6). The water jacket is operated under negative pressure.

8. A refining furnace for mixing and refining complex copper materials in anode plate production according to claim 7, characterized in that: The converter (6) is provided with a slag discharge port (7) and a copper outlet (11).

9. A refining furnace for mixing and refining complex copper materials in anode plate production according to claim 8, characterized in that: The slag discharge port (7) is located in the settling area and is more than one meter away from the end of the converter (6) and the spray gun (13).

10. A refining furnace for mixing and refining complex copper materials in anode plate production according to claim 9, characterized in that: The converter (6) is set with an inclination angle of ≥6°.

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