Continuous refining process and apparatus for blister copper

Abstract

A kind of crude copper continuous refining device, including furnace body, feeding port, copper outlet, slag outlet, the furnace body is equipped with partition, the partition is into the oxidation zone and reduction zone that are interconnected in furnace body, the oxidation zone is equipped with feeding port in the end far from partition, oxidation zone is equipped with slag outlet on side wall, the reduction zone is equipped with copper outlet in the end far from partition, the side wall of oxidation zone is provided with multiple first lance, the side wall of reduction zone is provided with multiple second lance, the height of second lance is lower than first lance;There is gap between the partition and the top of furnace body, partition is equipped with several through holes, the through hole includes first orifice and second orifice, the first orifice is towards oxidation zone, the second orifice is towards reduction zone, the height of first orifice is lower than second orifice, the height of second orifice is higher than second lance.The crude copper continuous refining device of the application not only realizes crude copper refining continuous operation, but also improves furnace body structure, improves refining efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of non-ferrous metallurgy, and particularly relates to a continuous refining method and device for crude copper. BACKGROUND

[0002] The copper smelting process generally includes four procedures of smelting, blowing, fire refining and electrolytic refining. In recent years, smelting and blowing have been gradually changed from discontinuous operation to continuous operation, but fire refining is still periodic operation. The successive flash blowing and multi-gun top blowing are continuous operation, which gradually replace the PS converter blowing. However, although the crude copper fire refining adopts the rotary anode furnace, it also replaces the reverberatory furnace, but still adopts periodic operation, and each cycle includes four stages of charging and melting period, oxidation period, reduction period and casting period.

[0003] In the whole refining process, each stage needs to be heated by burning natural gas according to the process needs, and the natural gas combustion adopts pure oxygen combustion technology.

[0004] In the charging and heating period, the liquid crude copper produced by the flash blowing furnace and the multi-gun top blowing furnace can flow directly into the rotary anode furnace through the chute, and the crude copper produced by the converter needs to be added into the anode furnace by the bag hoist. Part of the residual anode is added into the anode furnace by the charging machine, and the waste anode plate, chute shell and other materials are added into the anode furnace by the hoist. After charging and heating, it enters the oxidation period, and the main task of the oxidation period is to oxidize and remove sulfur and other impurity elements. During the oxidation process, compressed air is blown into the tuyere of the anode furnace, and sulfur dioxide is generated after sulfur is oxidized and enters the flue gas, and other impurity elements react with oxygen to generate oxides to remove slag. After the oxidation period ends, the slag is removed to enter the reduction period, and the task of the reduction period is to remove excess oxygen in the copper liquid. Solid reducing agent is used. The end of the reduction period is generally controlled at Cu>99.0%, S<0.005% and O<0.2%. After the anode furnace refining operation is completed, the copper water in the furnace flows into the quantitative casting ladle through the chute, and when the copper water in the casting ladle reaches the set weight, the casting ladle is tilted and poured into the anode mold of the disc casting machine for casting.

[0005] In fact, the time for oxidation in a refining cycle is 1.5-2 hours, and the time for reduction is 0.5-1.5 hours, and the actual oxidation and reduction time is only 2.0-3.5 hours, and the rest of the time is used for charging (0.5-1 hour), waiting for material and holding (4.5-16 hours), slagging (0.5 hour) and casting (4-4.5 hours). With the popularization and application of continuous converting technology, the fire refining process of crude copper has also changed, and the main change is the change of charging method, liquid crude copper flows into the anode furnace, and no longer needs to use a crane and a steel ladle for conveying and charging, but the operation mode of periodic operation has not changed. One converter must be equipped with two anode furnaces, and the two anode furnaces are periodically operated alternately, and the operation cycle is generally 12 hours, when one anode furnace is charged, the other anode furnace is oxidized, reduced and cast, and there is still a lot of holding time.

[0006] At present, the fire refining in China is operated alternately by two rotary anode furnaces, and there is often a long holding time for waiting for material and a long holding time for casting. During the holding period, natural gas needs to be burned to supplement heat, thereby increasing energy consumption, and in addition to the part used as a reducing agent, the natural gas consumed for supplementing heat is as high as 12m 3 / t of anode copper, and the equipment operation rate is reduced.

[0007] Chinese invention patent CN108277361B discloses a crude copper fire continuous refining furnace, which comprises a furnace body, a charging port, a smoke outlet, a copper outlet and a slag outlet, and the furnace body has an oxidation zone and a reduction zone which are in communication with each other, the smoke outlet is arranged at the top of the furnace body, the charging port is arranged in the oxidation zone, the copper outlet is arranged in the reduction zone, and the slag outlet is arranged in the oxidation zone and the reduction zone. By arranging the oxidation zone and the reduction zone which are in communication in the furnace, the oxidation and reduction reaction processes are carried out at the same time during operation, the smoke gas amount is small, the operation time can be shortened, the equipment utilization rate is improved, and the serious pollution problem caused by large SO2 smoke gas emission and the problem of crude copper cladding cold material in the traditional process are effectively solved. However, the passage of the partition wall and the movement trajectory of the melt are not scientific, it is difficult for the over-oxidized crude copper melt to be fully reduced, and the high temperature in the operation process can cause the furnace body to expand and even be damaged, thereby reducing the service life. SUMMARY

[0008] In view of the deficiencies of the prior art, the purpose of the present application is to provide a crude copper continuous refining method and device which not only realizes continuous operation of crude copper refining, but also improves the furnace body structure and improves the refining efficiency.

[0009] In order to solve the above technical problems, the technical scheme of the present application is as follows:

[0010] A continuous refining device for crude copper includes a furnace body, a charging port, a copper discharge port, and a slag discharge port. A partition wall is arranged in the furnace body, which divides the furnace body into an oxidation zone and a reduction zone that are in communication with each other. The oxidation zone is provided with the charging port at one end away from the partition wall, and the side wall of the oxidation zone is provided with the slag discharge port. The reduction zone is provided with the copper discharge port at one end away from the partition wall. The side wall of the oxidation zone is provided with a plurality of first lances, and the side wall of the reduction zone is provided with a plurality of second lances. The height of the second lances is lower than that of the first lances. There is a gap between the partition wall and the top of the furnace body. The partition wall is provided with a plurality of through holes, including first holes and second holes. The first holes are directed to the oxidation zone, and the second holes are directed to the reduction zone. The height of the first holes is lower than that of the second holes, and the horizontal height of the second holes is higher than that of the second lances.

[0011] The crude copper enters the oxidation zone of the continuous refining device for crude copper in a liquid state through the charging port and is kept in a molten state in the furnace, having good fluidity and heat conductivity. The addition amount of the crude copper is balanced with the casting speed of the anode plate, and the liquid level of the melt is basically kept constant. In the melt flow process, the first lances of the oxidation zone spray oxygen-enriched air, so that the impurity elements fully contact with oxygen and chemically react, and the generated oxides float into the slag phase and are discharged through the slag discharge port. There is a certain space between the partition wall and the top of the furnace body, allowing flue gas to be discharged from the same flue. The copper liquid enters the reduction zone through the through holes in the partition wall, and the second lances of the reduction zone spray reducing agents. The installation position of the second lances of the reduction zone is lower than that of the first lances of the oxidation zone, so as to ensure that a stable reducing atmosphere is always maintained in the local area near the copper discharge port, so that the copper liquid is fully reduced. The through holes are siphon-type inclined through holes with low inlet and high outlet. The copper liquid is lifted to the upper part of the reduction zone through the through holes, and the copper liquid passing through the siphon through holes can enhance the stirring of the copper liquid in the reduction zone, so as to ensure that the copper liquid is fully mixed with the reducing agent and improve the reduction efficiency. The reduced copper liquid is discharged through the copper discharge port.

[0012] Further, the lower edge of the first hole is the upper surface of the refractory lining at the bottom of the oxidation zone.

[0013] Further, the difference between the height of the partition wall and the height of the slag discharge port is 0.8-1.2 m, and the length of the oxidation zone is 3-4 times the length of the reduction zone. In this way, the copper liquid has sufficient residence time in the furnace, and in the melt flow process, the impurity elements have time to fully contact with oxygen and chemically react, and the generated oxides have sufficient time to float into the slag phase.

[0014] Further, the furnace bottom is provided with a refractory lining. The difference between the thickness of the refractory lining at the bottom of the oxidation zone and the thickness of the refractory lining at the bottom of the reduction zone is in the range of 150-200 mm. The depth of the hearth of the reduction zone is greater than the depth of the hearth of the oxidation zone, and the molten pool of the reduction zone is lower. In this way, it is convenient for the melt to flow from the oxidation zone to the reduction zone.

[0015] Further, the first lance is provided with a third lance, the third lance is provided with inner and outer two layers of sleeve, the difference between the outer diameter of the third lance and the inner diameter of the first lance is 1-2mm, the third lance is inserted into the first lance; the second lance is provided with the same third lance. In this way, it is convenient to measure and maintain. All fuel, reducing agent and flux are sprayed into the furnace by the third lance. When the third lance is not needed, it can be pulled out at any time, the insertion or pulling out operation of the third lance is very simple and convenient, and does not affect normal production.

[0016] Further, the rough copper continuous refining device is a vertical rectangular structure, the top of the furnace is provided with a molten steel jacket; one end of the furnace top near the oxidation zone is provided with a cold charge adding port; the furnace wall is a sandwich structure formed by alternately building the refractory bricks and the copper jackets along the height direction of the furnace body, and a plurality of refractory bricks are arranged between the adjacent copper jackets. In this way, the rectangular structure of the furnace bottom makes the expansion of the refractory lining uniform and directional, which is convenient for controlling and constraining the expansion.

[0017] Further, cooling air ducts are arranged close to the outside of the furnace bottom, the adjacent cooling air ducts are parallel to each other, the middle positions of the adjacent cooling air ducts are communicated with each other, the positions where the cooling air ducts are communicated with each other are provided with air outlets, and the two ends of the cooling air ducts are provided with air inlets. In this way, the working temperature of the refractory lining of the furnace bottom is controlled by adjusting the air volume, the molten metal is prevented from penetrating into the refractory material, the service life of the refractory lining is prolonged, and the refractory lining is prevented from being broken due to high temperature expansion.

[0018] Further, the rough copper continuous refining device comprises a steel framework, and a plurality of spring assemblies are arranged between the steel framework and the furnace body shell. In this way, the steel framework elastically constrains the furnace body as a whole through the spring assemblies, so that the refractory lining of the furnace bottom and the furnace body shell are prevented from being broken due to expansion.

[0019] Further, the spring assembly comprises a spring and a connecting rod, the connecting rod is connected with the spring through the steel framework, nuts are arranged at the two ends of the connecting rod, and a connecting piece is arranged between the connecting rod and the spring. In this way, one end of the spring is connected with the furnace body shell, and the other end of the spring is connected with the steel framework through the connecting piece and the connecting rod. When the furnace body shell expands outward, the spring is compressed towards the steel framework, and when the spring is compressed to a certain length, the distance between the connecting piece and the steel framework is adjusted by rotating the nut, so that the length of the spring is adjusted, and the spring is prevented from being damaged due to excessive compression.

[0020] Optionally, the spring is a butterfly spring, and a sleeve is arranged outside the butterfly spring. In this way, dust and impurities are prevented from falling between the spring leaves, so that the service life and accuracy of the spring are affected.

[0021] Further, a scale mark is arranged on the spring assembly, one end of the scale mark is connected with the steel framework, and a gap is arranged between the other end of the scale mark and the furnace body shell. In this way, the compression condition of the spring can be accurately reflected, and the nut is adjusted according to the compression condition of the spring, so that the compression amount is prevented from being too large to damage the disc spring.

[0022] When the rough copper continuous refining device works, the high temperature in the furnace makes the refractory lining of the furnace bottom expand, so that the furnace body shell expands outward, the disc spring is compressed, and the steel framework does not deform due to its strength, and can elastically constrain the furnace body; when the work is stopped, the temperature decreases, the furnace body cools and shrinks, and the disc spring returns to the original position.

[0023] A rough copper continuous refining method is performed by using the rough copper continuous refining device, and includes the following steps.

[0024] S1, liquid rough copper is added into the oxidation zone from the charging port, and oxygen-enriched air is sprayed into the oxidation zone through the first lance of the oxidation zone to perform oxidation reaction;

[0025] S2, the oxidation refining slag is discharged through the slag discharge port;

[0026] S3, the copper liquid is lifted to the upper part of the reduction zone through the through hole at the bottom of the partition wall;

[0027] S4, the reducing agent is sprayed into the reduction zone through the third lance of the reduction zone to make the copper liquid perform reduction reaction;

[0028] S5, the reduced copper liquid is discharged through the copper discharge port.

[0029] Further, in step S1, the sulfur in the melt is oxidized to generate SO2, which enters the flue gas as the furnace gas rises, and the iron and other non-ferrous metal impurities are oxidized to generate corresponding metal oxides, which will float into the slag phase during the movement of the melt due to their lower density than copper.

[0030] Further, in step S2, the oxidation refining slag is discharged through the slag discharge port according to the amount of slag.

[0031] Further, in step S4, air or oxygen-enriched air is sprayed at the same time, and the spraying amount of the air or oxygen-enriched air is 40%-60% of the theoretical oxygen amount for complete combustion of the reducing agent. In this way, not only the stirring of the gas melt is increased, but also the diffusion and reaction of the reducing agent are accelerated, and the methane in the natural gas is converted into CO and H2, thereby improving the reduction efficiency and reaction speed.

[0032] Optionally, the reducing agent is natural gas or coal powder.

[0033] Further, in step S5, the oxygen content of the copper liquid is less than 0.2%.

[0034] Further, the oxidation zone and the reduction zone are both fueled by natural gas to supplement the heat required by the melt.

[0035] The liquid blister copper produced by blowing is introduced into the oxidation zone, and the oxygen-enriched air is blown into the blister copper by the side-blown lance. The sulfur in the blister copper is oxidized into SO2 and enters the flue gas, and the impurities such as iron, zinc, lead, antimony, nickel, arsenic and tin are oxidized into corresponding oxides and enter the slag phase. Although the affinity of copper for oxygen is low, a small amount of Cu is oxidized into Cu2O in the oxidation process, resulting in the oxygen content in the copper melt exceeding the requirement for electrolysis. Therefore, the excess oxygen must be removed by reduction, and the copper melt is introduced into the reduction zone in a submerged flow. The reducing agent is blown into the copper melt by the lance in the reduction zone to remove the excess oxygen in the copper melt and obtain qualified copper melt. The copper melt is continuously discharged from the copper discharge port for subsequent operation. The oxygen-enriched air blown by the lance forms a gas flow, which is stirred together with the directional flow generated by the continuous addition and continuous discharge of the copper melt, so that the copper melt is always in a moving state in the furnace.

[0036] Compared with the prior art, the beneficial effects of the present application are as follows:

[0037] (1) The furnace body is divided into an oxidation zone and a reduction zone, which not only realizes continuous operation of blister copper refining, but also improves the reduction efficiency.

[0038] (2) The heat dissipation type cooling furnace bottom structure reduces the working temperature of the refractory lining of the furnace bottom, prevents the refractory lining from expanding and cracking, and improves the service life of the equipment.

[0039] (3) The furnace body adopts an elastic restraint structure, which allows the refractory lining and the furnace body shell to freely expand within a certain range, thereby avoiding high-temperature expansion and cracking. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a structural schematic diagram of the present application;

[0041] Figure 2 is a sectional view of A-A of Figure 1 ;

[0042] Figure 3 is an enlarged view of B in Figure 2 ;

[0043] BRIEF DESCRIPTION OF REFERENCE NUMERALS: 1, charging port, 2, cold material addition port, 3, first lance, 4, second lance, 5, furnace wall, 6, steel framework, 7, copper discharge port, 8, slag discharge port, 9, spring assembly, 91, disc spring, 92, sleeve, 93, nut, 94, connecting rod, 95, scale ruler, 10, refractory lining, 11, cooling air duct, 12, steel jacket, 13, partition wall, 131, through hole, 14, third lance, 15, furnace body shell, 16, refining slag, 17, blister copper, 18, over-oxidized anode copper, 19, anode copper. DETAILED DESCRIPTION

[0044] The present invention will be described in detail below with reference to embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0045] like Figures 1-3 As shown, a continuous crude copper refining apparatus includes a furnace body, a feeding port 1, a copper discharge port 7, and a slag discharge port 8. A partition wall 13 is provided inside the furnace body, dividing the furnace body into an interconnected oxidation zone and a reduction zone. The feeding port 1 is located at the end of the oxidation zone away from the partition wall 13, and the slag discharge port 8 is located on the side wall of the oxidation zone. The copper discharge port 7 is located at the end of the reduction zone away from the partition wall 13. The apparatus is characterized in that a plurality of first spray guns 3 are provided on the side wall of the oxidation zone, and a plurality of second spray guns 4 are provided on the side wall of the reduction zone. The height of the second spray guns 4 is lower than that of the first spray guns 3. There is a gap between the partition wall 13 and the top of the furnace body. The partition wall 13 is provided with a plurality of through holes 131, each through hole 131 including a first opening and a second opening. The first opening faces the oxidation zone, and the second opening faces the reduction zone. The height of the first opening is lower than that of the second opening.

[0046] The slag discharge port 8 is located near the partition wall 13, and its height is consistent with the horizontal level of the molten copper. Impurities in the oxidation zone come into full contact with oxygen and undergo a chemical reaction, generating oxides that float to the surface and enter the slag phase. The refined slag 16 is discharged through the slag discharge port.

[0047] The feed port 1 is located on the side wall of the oxidation zone away from the partition wall 13.

[0048] The copper discharge port 7 is located on the side wall of the reduction zone away from the partition wall 13, and is preferably a siphon copper discharge port. The continuously refined anode copper 19 is continuously discharged through the copper discharge port 7 before the casting process.

[0049] The end of the through-hole 131 connected to the oxidation zone is the first orifice, and the end connected to the reduction zone is the second orifice. The diameter of the first orifice is larger than that of the second orifice. The through-hole 131 is a siphon through-hole. The low mounting position of the second spray gun 4 ensures a stable reducing atmosphere in the local area near the copper outlet. The copper liquid passing through the siphon through-hole enhances the agitation of the copper liquid in the reduction zone, ensuring thorough mixing of the copper liquid and the reducing agent, and improving the reduction efficiency.

[0050] The continuous crude copper refining device is a vertical rectangular structure with a steel jacket 12 on the top of the furnace. A cold material inlet 2 is provided at one end of the top of the furnace near the oxidation zone. The furnace wall 5 is a sandwich structure formed by alternating refractory bricks and copper jackets along the height of the furnace body, with several refractory bricks spaced between adjacent copper jackets.

[0051] The height difference between the partition wall 13 and the height of the slag outlet 8 is 1.0 m, and the length of the oxidation zone is 4 times the length of the reduction zone, so that the blister copper 17 can stay in the furnace for a sufficient time, and the impurity elements have sufficient time to contact with oxygen and chemically react during the flow of the melt, and the generated oxides have sufficient time to float into the slag phase, and the blister copper 17 becomes the peroxide anode copper 18 and sinks to the bottom of the oxidation zone. The peroxide anode copper at the bottom of the oxidation zone enters the through hole 131 through the first orifice of the through hole 131 and flows out of the second orifice of the through hole 131 into the reduction zone. The horizontal height of the second orifice is higher than the height of the second lance 4.

[0052] The bottom is provided with a refractory lining 10, and the thickness difference between the refractory lining of the oxidation zone and the refractory lining of the reduction zone is 200 mm. The distance from the bottom to the top of the reduction zone is greater than the distance from the bottom to the top of the oxidation zone. The hearth of the oxidation zone is relatively shallow, and the hearth of the reduction zone is relatively deep. The lance pipes of the first lance 3 and the second lance 4 are made of cast steel and are provided with a water cooling protection assembly. The first lance 3 and the second lance 4 are horizontally installed, and the lance pipes extend into the melt. The first lance 3 is an oxidation lance, and the second lance 4 is a reduction lance. The installation position of the reduction lance is lower than that of the oxidation lance. The first lance is provided with a wind lock ball valve. When the first lance 1 delivers oxygen-enriched air, the steel ball falls down and is pushed against the bushing by the air pressure to prevent air leakage.

[0053] The first lance 3 is provided with a third lance 14, and the third lance 14 is provided with inner and outer double sleeves. The difference between the outer diameter of the third lance 14 and the inner diameter of the first lance 3 is in the range of 1-2 mm, and the third lance 14 is inserted into the first lance. The second lance 3 is also provided with the same third lance 14. The third lance 14 is a plug-in sleeve lance. The third lance 14 is inserted into the first lance 3 and used. After the third lance 14 is inserted into the first lance 3, it is rotated by a certain angle and clamped on the first lance 3, so that it is very convenient to install and remove. The third lance 14 is provided with inner and outer double sleeves. The inner central pipe sprays gas or powdery material, and the outer ring pipe delivers air or oxygen-enriched air. When the reaction in the furnace needs to supplement a certain flux, the sleeve lance is inserted into one or several oxidation lances to spray powdery flux into the furnace. When the sleeve lance is inserted into the oxidation lance, the steel ball is pushed up to cut off the oxygen-enriched air. In order to facilitate metering and maintenance, all fuels, reducing agents and fluxes are sprayed into the furnace by the third lance 14. When the sleeve lance is not needed, it can be pulled out at any time. The insertion and removal of the sleeve lance is very simple and convenient, and does not affect normal production.

[0054] Cooling air ducts 11 are arranged outside the furnace bottom, and are parallel to each other. The middle positions of adjacent cooling air ducts 11 are connected to each other. The positions where the cooling air ducts 11 are connected to each other are provided with air outlets. The two ends of the cooling air ducts 11 are provided with air inlets. A fan is used to forcibly blow or suck air to cool the furnace bottom. The air volume is adjusted to control the temperature of the refractory lining 10 of the furnace bottom. The refractory lining 10 of the furnace bottom is of a heat-dissipating structure and material. The working layer of refractory material that contacts the melt has good high-temperature performance. The heat-dissipating layer of refractory material that contacts the furnace shell has good heat-conducting performance. The temperature between the working layer and the heat-dissipating layer is 500°C. The side of the furnace bottom where the cooling air ducts 11 are arranged is connected to a plurality of arc-shaped saddles. The arc-shaped saddles are made of steel plates and support the furnace body.

[0055] The continuous copper refining device includes a steel framework 6 connected to the arc-shaped saddles. The steel framework 6 includes upper and lower ring beams and a plurality of vertical columns. The vertical columns are perpendicular to the horizontal direction and are provided with intervals between adjacent vertical columns. The ring beams are parallel to the horizontal direction and are provided with intervals between adjacent ring beams. The vertical columns and the ring beams are connected by welding. The upper and lower ring beams have sufficient strength and rigidity, and a gap is left between the steel framework 6 and the furnace shell 15. The steel framework 6 can constrain the deformation caused by the expansion of the furnace top and the furnace bottom, and will not be deformed.

[0056] A plurality of spring assemblies 9 are arranged between the steel framework 6 and the furnace shell 15. The spring assembly 9 includes a spring and a connecting rod 94 connected to the spring. The two ends of the connecting rod 94 are provided with nuts 93. A connecting piece is arranged between the connecting rod 94 and the spring.

[0057] The spring is a disc spring 91, and a sleeve 92 is arranged outside the disc spring 91. A connecting piece is arranged in the sleeve 92. One end of the connecting piece is connected to the connecting rod 94, and the other end of the connecting piece is connected to the spring. A gap is arranged between the sleeve and the steel framework 6. The characteristic curve of the disc spring 91 needs to be tested and marked by a computer. The appropriate size and model are selected according to the expansion amount and the expansion force.

[0058] A scale 95 is arranged on the spring assembly 9. One end of the scale 95 is fixed on the steel framework, and the other end of the scale 95 is left with a gap from the furnace shell 15.

[0059] During the production process, the disc spring 91 will be compressed to a certain amount after the expansion of the furnace bottom, and an alarm will be given. The compression amount of the disc spring 91 is adjusted by rotating the nut 93 to avoid damage to the disc spring 91.

[0060] A continuous copper refining method is provided, which is performed by using the continuous copper refining device described above and includes the following steps.

[0061] S1, liquid crude copper is added into the oxidation zone from the charging port, and oxygen-enriched air is sprayed into the oxidation zone through the first lance of the oxidation zone to perform oxidation reaction;

[0062] S2, the oxidation refining slag is discharged through the slag discharge port;

[0063] S3, the copper liquid flows to the reduction zone through the through hole on the partition wall;

[0064] S4, the reducing agent is sprayed into the reduction zone through the third lance of the reduction zone to make the copper liquid perform reduction reaction;

[0065] S5, the reduced copper liquid is discharged through the copper discharge port.

[0066] In step S4, air or oxygen-enriched air is sprayed at the same time, the spraying amount of air or oxygen-enriched air is 40%-60% of the theoretical oxygen amount for complete combustion of the reducing agent, the amount of reducing agent and the proportion of oxygen-enriched air thereof are accurately controlled, and the balance between the reduction speed and the oxidation speed is maintained. The reducing agent in step S4 is natural gas. In step S5, the oxygen content of the copper liquid is less than 0.2%, and a stable reducing atmosphere is maintained in the local area near the copper discharge port.

[0067] The content illustrated in the above examples should be understood as that the examples are only used to more clearly illustrate the present application, and are not used to limit the scope of the present application. After reading the present application, various equivalent modifications of the present application made by those skilled in the art all fall within the scope defined by the appended claims of the present application.

Claims

1. A continuous refining device for crude copper, comprising a furnace body, a charging port (1), a copper discharging port (7), and a slag discharging port (8), a partition wall (13) is arranged in the furnace body, the partition wall (13) divides the furnace body into an oxidation zone and a reduction zone which are in communication with each other, the oxidation zone is provided with the charging port (1) at one end away from the partition wall (13), the side wall of the oxidation zone is provided with the slag discharging port (8), and the reduction zone is provided with the copper discharging port (7) at one end away from the partition wall (13), characterized in that, The sidewall of the oxidation zone is provided with a plurality of first spray guns (3), and the sidewall of the reduction zone is provided with a plurality of second spray guns (4). The height of the second spray guns (4) is lower than that of the first spray guns (3). There is a gap between the partition wall (13) and the top of the furnace body. The partition wall (13) is provided with a plurality of through holes (131). The through holes (131) include a first opening and a second opening. The first opening faces the oxidation zone, and the second opening faces the reduction zone. The height of the first opening is lower than that of the second opening, and the horizontal height of the second opening is higher than that of the second spray guns (4). The difference between the height of the partition wall (13) and the height of the slag discharge port (8) is 0.8-1.2m. The length of the oxidation zone is 3-4 times that of the reduction zone. The furnace bottom is provided with a refractory lining (10). The difference between the thickness of the refractory lining at the bottom of the oxidation zone and the thickness of the refractory lining at the bottom of the reduction zone is 150-200mm. The bottom of the molten pool in the reduction zone is lower than the bottom of the molten pool in the oxidation zone. The lower edge of the first orifice is the upper surface of the refractory lining at the bottom of the oxidation zone.

2. A continuous copper refining plant according to claim 1, characterized in that, The first spray gun (3) is provided with a third spray gun (14), the third spray gun (14) is provided with inner and outer sleeves, the difference between the outer diameter of the third spray gun (14) and the inner diameter of the first spray gun (3) is 1-2mm, and the third spray gun (14) is inserted into the first spray gun; the second spray gun (3) is provided with the same third spray gun (14).

3. A continuous copper refining plant according to claim 1, characterized in that, Cooling air ducts (11) are provided close to the outside of the furnace bottom. Adjacent cooling air ducts (11) are parallel to each other and are connected in the middle. Air outlets are provided at the locations where the cooling air ducts (11) are connected. Air inlets are provided at both ends of the cooling air ducts (11).

4. The continuous copper refining apparatus according to claim 1, characterized in that, It includes a steel frame (6), and multiple spring assemblies (9) are provided between the steel frame (6) and the furnace shell (15).

5. The continuous copper refining apparatus according to claim 4, characterized in that, The spring assembly (9) includes a spring and a connecting rod (94). The connecting rod (94) passes through the steel frame (6) and is connected to the spring. Nuts (93) are provided at both ends of the connecting rod (94). A connector is provided between the connecting rod (94) and the spring.

6. The continuous copper refining apparatus according to claim 5, characterized in that, The spring is a butterfly spring (91), and a sleeve (92) is provided on the outside of the butterfly spring (91).

7. The continuous copper refining apparatus according to claim 4, characterized in that, The spring assembly (9) is provided with a scale (95), one end of which is connected to the steel frame, and the other end of which is provided with a gap between it and the furnace shell (15).

8. A continuous refining method for crude copper, characterized in that, The process, using the continuous crude copper refining apparatus as described in any one of claims 1-7, includes the following steps: S1. Liquid crude copper is added to the oxidation zone through the feed port, and oxygen-rich air is sprayed in through the first spray gun in the oxidation zone to carry out the oxidation reaction. S2. Discharge the oxidized refining slag through the slag discharge port; S3. The copper peroxide solution rises to the upper part of the reduction zone through the through holes in the partition wall; S4. A reducing agent is sprayed into the copper liquid through the third spray gun in the reduction zone, and the copper liquid undergoes a reduction reaction. S5. The reduced copper liquid is discharged through the copper drain port.

9. The continuous refining method for crude copper according to claim 8, characterized in that, In step S4, air or oxygen-enriched air is injected simultaneously, and the amount of air or oxygen-enriched air injected is 40%-60% of the theoretical oxygen content for the complete combustion of the reducing agent.

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