Blowing method for carbon-rich wind-loaded semi-coke of Ausmelt furnace

Abstract

The invention belongs to the field of copper smelting of Ausmelt furnaces (Ausmelt furnaces), and particularly relates to a method for blowing carbon-rich wind-loaded semi-coke of an Ausmelt furnace. Aiming at the problems of large temperature gradient of a molten pool, high viscosity of molten slag, slag gushing in the gun and the like caused by large content of fly ash blown by a central coal gun and too high reaction speed in the prior art, semi-coke is used for replacing a part of pulverized coal, and mixed gas of CO and CO2 is used for replacing air to blow the semi-coke and the pulverized coal, so that the temperature difference of the side wall of the center of the molten pool is 70-150 DEG C; the average content of Fe3O4 in the slag is 6.5%-10%, the average viscosity of the slag is 0.5 Pa.s to 1.0 Pa.s, and the production condition is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the field of copper smelting of an Ausmelt furnace, and in particular relates to a method for injecting carbon-rich wind-borne semi-coke in an Ausmelt furnace. Background Art

[0002] The core of Ausmelt technology is the spray gun technology, which consists of four specially designed concentric sleeves: the innermost layer is pulverized coal and air (coal-carrying air); the second layer is oxygen; the third layer is air (spray gun air); the outermost layer is sleeve air (sleeve air) to protect the third sleeve wall, and also to assist the combustion of sulfur and other combustible components (mainly CO) in the combustion flue gas generated by smelting in the furnace. During operation, the spray gun is inserted from the top of the furnace into the melt in the vertically placed cylindrical furnace, and air (or oxygen-enriched air) and fuel (oil, natural gas or pulverized coal) are sprayed into the melt from the end of the spray gun, creating a violently churning molten pool surface in the furnace, and the charge is directly added to the churning molten pool from the top feeding port.

[0003] The large pieces of raw coal piled in the coal storage bin are transported to the hammer crusher through the conveyor belt for crushing. After crushing, the coal with a particle size of 30mm is screened through the vibrating screen, and the coal with a particle size of less than or equal to 10mm is sent to the vertical mill through the conveyor belt and the weighing coal feeder. Under the suction force of the centrifugal fan, the hot air in the combustion chamber is drawn into the rotating vertical mill. At this time, the coal with moisture and the hot air undergo a strong heat exchange to obtain dried and ground pulverized coal. The pulverized coal is sent to the bag dust collector for separation and collection under the action of the centrifugal fan. The pulverized coal in the ash hopper of the bag dust collector is collected into the pulverized coal bin through a screw conveyor, and then transported to the pulverized coal bin on the side of the Australian furnace and the fuming furnace through a bin pump. The other part of the pulverized coal is sent to the combustion chamber through a primary fan.

[0004] The processing of pulverized coal is also relatively complicated, and the water content in the pulverized coal needs to be controlled. Otherwise, when the water content is greater than 7%, it is very easy to cause the spray gun to be blocked, and it will also affect the combustion efficiency. In addition, the pulverized coal itself contains a high ash content, which will increase the amount of slag. The main components of ash are SiO2 (10%~60%), Al2O3 (5%~35%), Fe2O3 (4%~25%) and CaO (5%~40%), which is not conducive to the flow and separation of slag metal in the molten pool. It will also increase the pressure of the spray gun and the risk of slag surge in the molten gun, as well as the difficulty of slag discharge at the weir, which seriously affects production. Therefore, the pulverized coal needs to be fully burned in the furnace to ensure that the furnace has a sufficiently high temperature, but it is necessary to pay attention to cleaning the agglomeration and blockage of the burner outlet, and to prevent the occurrence of serious accidents such as fire or explosion of pulverized coal and pulverized coal bins.

[0005] During the smelting process of copper smelting in the Ausmelt furnace, the wetted and mixed materials are added to the molten pool from the top feed port of the furnace, and the fuel (pulverized coal) and combustion air are sprayed in through the spray gun inserted into the molten pool. Pulverized coal is used as both fuel and reducing agent. The furnace temperature is the fundamental guarantee for the normal operation of smelting, but the pulverized coal is extremely fine in particle size, and it is very easy to get blocked when flowing with the coal injection wind in the coal gun, resulting in poor feeding, which is easy to cause excessive pressure, leading to dust explosion and other serious problems that endanger production and personal safety, while reducing the blast speed cannot meet the needs of production intensity. The fast combustion speed of pulverized coal leads to uneven heat transfer in the molten pool. The temperature of the molten pool near the spray gun is high, and the temperature of the molten pool near the furnace wall is low, thus generating a large temperature gradient. The large temperature gradient leads to untimely and inaccurate feedback on the actual temperature of the furnace body, extremely high requirements for operation, low tolerance for production operation, and frequent production accidents that fail to meet production standards. The operation requirement of Ausmelt furnace is a small temperature gradient, that is, the temperature distribution is uniform. A large temperature gradient can easily deteriorate the slag phase composition, making the slag fluidity worse, thus producing foamy slag, slag surge and other phenomena, damaging the furnace lining and spray gun.

[0006] On the other hand, it is necessary to control the content of Fe3O4 in the slag to less than 15%, and the large temperature gradient is not conducive to the reduction process of Fe3O4 in the molten pool. The grade of matte produced by the Ausmelt smelting furnace is about 60%, and the removal rate of iron and sulfur is large. FeS in the ore will be oxidized to FeO and Fe3O4 under the injection of an oxidizing atmosphere, and the higher the Fe3O4 content, the worse the fluidity of the slag. Under strong oxidizing atmosphere conditions, a part of the iron is oxidized to Fe3O4, which will deteriorate the properties of the slag, affect the clarification and separation of the slag and matte, and form a furnace mass when deposited at the bottom of the furnace. The formation of Fe3O4 is inevitable in the process of Ausmelt smelting to produce high-grade matte. In order to further reduce the Fe3O4 content in the slag, it is necessary to control Fe3O4 at a certain level to prevent the generation of foamy slag. Pulverized coal is used as a fuel and a reducing agent to control the peroxidation of FeO in the slag and reduce Fe3O4 to FeO. Pulverized coal and Fe3O4 react as follows: 2Fe3O4+C=6FeO+CO2. However, the reaction speed of pulverized coal is too fast and the reactivity of pulverized coal is too active. It quickly reduces the Fe3O4 in the molten pool slag near the spray gun and reduces its concentration, so that there is a concentration gradient between it and the Fe3O4 in the molten pool slag near the furnace wall. The viscosity of the slag also deteriorates. This makes it extremely difficult to control the oxygen potential in the molten pool and the degree of deterioration of the slag viscosity, resulting in large production fluctuations and difficult operations. Therefore, reducing the temperature gradient, reasonably controlling the melt temperature, and reducing the harm of sticky slag are key issues in production operations. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a method for spraying semi-coke with carbon-rich air in an Ausmelt furnace, wherein a top-blowing lance is composed of four layers of concentric sleeves, the innermost central coal lance sprays pulverized coal and air, the second layer of oxygen lance sprays oxygen, the third layer sprays air to form lance wind, and the outermost layer sprays air to form sleeve wind, the pulverized coal in the innermost layer of the top-blowing lance is replaced with semi-coke, and the spraying air in the innermost layer of the top-blowing lance is replaced with carbon-rich gas; the carbon-rich gas comprises a mixed gas composed of CO and CO2, and the carbon-rich gas is used as a carrier gas and is sprayed into the furnace together with the semi-coke and pulverized coal through the lance; Preferably, the CO accounts for 40% to 50% of the carbon-rich gas, and the CO2 accounts for 50% to 60% of the carbon-rich gas; at this time, the semi-coke replaces 40% to 60% (mass percentage) of the pulverized coal; and the particle size of the semi-coke is 6 mm to 13 mm.

[0008] Taking the total amount of charge added per unit time as 150t / h~180t / h as a reference, the top-blowing lance parameters for each ton of charge (i.e. ore + auxiliary materials) are set as follows: the carbon-rich gas back pressure of the innermost center coal gun of the top-blowing lance is 20kPa~30kPa, and the carbon-rich gas supply intensity is 400Nm 3 / (t·h)~500Nm 3 / (t·h); oxygen back pressure of the second layer oxygen gun is 78kPa~90kPa, oxygen supply intensity is 25000Nm 3 / (t·h)~27000Nm 3 / (t·h); The third layer of spray gun wind (air) back pressure is 68kPa~78kPa, and the air supply intensity is 13500Nm 3 / (t·h)~15000Nm 3 / (t·h); the outermost sleeve wind (air) back pressure is 47kPa~52kPa, and the air supply intensity is 7000Nm 3 / (t·h)~7400Nm 3 / (t·h).

[0009] The method for injecting carbon-rich wind-borne semi-coke in an Ausmelt furnace of the present invention comprises the following main steps: (1) The semi-coke particles and pulverized coal are mixed through the feeding system and then enter the spray gun through the silo valve; (2) copper ore and auxiliary materials are fed into the molten pool, the spray gun is lowered to the specified production height, and the carbon-rich gas pressure of the innermost center coal gun of the spray gun is adjusted to spray, and the semi-coke particles, pulverized coal and carbon-rich gas are sprayed into the melt; (3) When the copper matte grade reaches 58%~62%, record the center temperature and side wall temperature of the molten pool and take slag samples for analysis.

[0010] The present invention uses a mixture of CO2 and CO as "coal-carrying air" instead of air, which has the following advantages: (1) CO2 has weaker oxidizing property than O2, and can weaken the strong oxidizing effect of O2 on the molten pool to a certain extent, thereby preventing the excessive conversion of FeO in the molten pool into Fe3O4; (2) CO can further reduce Fe3O4 and reduce its content; (3) CO2 and CO have strong molecular diffusion ability and stronger stirring effect than air, which helps to accelerate the reaction speed of the molten pool and make the matte-forming reaction and the redox reaction of Fe3O4 in the molten pool proceed more fully; (4) CO2 helps to control the temperature gradient of the molten pool and prevent overheating, thereby reducing volatile metal dust in the flue gas and reducing copper loss.

[0011] In addition to using the pure CO2 and CO mixture of the present invention as carbon-rich gas, the vented coal gas can also be used as the carrier gas for injection. The vented coal gas comes from the steel-making converter and refers to the by-product gas whose quality does not meet the enterprise's recovery standards. Generally, the vented coal gas has a high CO2 content (25%~45%) and a low CO content (10%~30%). It has physical heat of 400℃~1000℃, which can reduce fuel costs. It is a low-cost, high-quality coal-carrying air alternative.

[0012] The present invention uses granular blue coke to partially replace pulverized coal, which has the following advantages: (1) it will not cause clogging of the spray gun; (2) it has a slow combustion speed, which avoids local excessive temperature and is conducive to uniform temperature distribution in the molten pool; (3) it exists in the molten pool for a longer time, the duration of the reduction reaction is prolonged, and it is more evenly dispersed in the molten pool than lump coal, which helps to uniformly and continuously control the Fe3O4 content in the molten pool at a lower level; (4) it has a low ash content and will not increase the amount of slag; (5) the price of blue coke is half of that of coal, which reduces the cost.

[0013] Raw coal is coal mined from mines, with a larger particle size, generally 50mm~300mm. Powdered coal is coal that has been crushed and processed, with a smaller particle size, generally 0.1mm~6mm. The particle size of granular coal is 6mm~13mm. Coal with a particle size greater than 13mm, which is obtained by falling or crushing raw coal with uneven particle size by a large-scale jaw crusher, is called lump coal. Semi-coke (also known as semi-coke, coke powder) has a block structure and is made from clean coal blocks. The particle size is generally between 10mm~80mm. It has the characteristics of "three highs and four lows", such as high fixed carbon, high specific resistivity, high chemical activity, low ash content, low aluminum, low matte, and low phosphorus, but its strength and crushing resistance are relatively poor. The market price is much lower than that of general coke, and is currently only about half of the price of coking coal. Coke has high strength, low ash content, large particle size, and strong reactivity. However, the price of metallurgical coke is higher than that of raw coal. Therefore, a certain proportion of metallurgical coke can be selected as an alternative raw material for the combination of lignite / raw coal.

[0014] The method of the present invention can control the slow and long-term oxidation process of FeO in the melt by the reducing agent, while retaining a part of Fe3O4 to undergo slag-forming reaction (3Fe3O4+FeS+5SiO2=5(2FeO·SiO2)+SO2), rather than completely and quickly directly removing the presence of Fe3O4; the fluidity of the slag is significantly improved. After adopting the carbon-rich wind-borne blue coke injection method of the present invention, the temperature difference between the center temperature and the side wall temperature of the molten pool is 70°C~150°C, the average content of Fe3O4 in the slag is 6.5%~10%, the center side wall concentration difference is 3%~5%, and the average viscosity of the slag is 0.5Pa·s~1.0Pa·s. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the Ausmelt furnace spray gun in the present invention. DETAILED DESCRIPTION

[0016] The technical scheme of the present invention is clearly and completely described below in conjunction with the embodiments and the accompanying drawings. It should be pointed out that the embodiments described in the present invention are only used to further explain and illustrate, rather than to limit the scope of application. Based on the present invention, all other schemes obtained by those skilled in the art without making creative work belong to the protection scope of the present invention.

[0017] The basic process of copper smelting in the Ausmelt furnace in the embodiment is as follows: (1) The ore used in the embodiment is copper sulfide ore, and the main components and contents of the ore are Cu: 22%~25%, S: 26%~31%, Fe: 25%~30%, SiO2: 5%~7%, and CaO: 1.5%~3%. The ore is fed into the furnace through a conveyor belt through the feeding port on one side of the Ausmelt furnace spray gun, and the feeding speed is 150t / h~180t / h. Lump coal with a particle size of 30mm~200mm (of which 40mm~100mm accounts for 90%) is fed into the furnace through a conveyor belt, and the lump coal consumption is 1t / h~3t / h. River sand with a particle size of 1mm~3mm (as flux, SiO2 content is more than 97%) is fed into the furnace through a conveyor belt, and the flux addition amount is 10t / h~20t / h. Lump coal, flux and ore are fed into the furnace separately without premixing.

[0018] The specific dosage of each material in the embodiments and comparative examples is as follows: 155 t / h of mineral material, 1.5 t / h of lump coal, and 14 t / h of river sand.

[0019] (2) After lowering the top-blowing spray gun to below the slag surface, there is no need to wait for the raw materials to melt. The top-blowing spray gun can be directly immersed in the molten pool, and the tuyere pressure of the top-blowing spray gun can be adjusted to spray the molten pool.

[0020] In order to further highlight the effect of bottom blowing, the conditions of the top blowing gun in each embodiment and comparative example are the same. The entire charging and blowing process is continuous. The top blowing gun parameters corresponding to each ton of furnace charge (ore + auxiliary materials) are as follows: The carbon-rich gas back pressure of the innermost center coal gun is 25kPa, and the carbon-rich gas supply intensity is 450Nm 3 / (t·h); oxygen back pressure of the second layer oxygen gun is 85kPa, oxygen supply intensity is 26000Nm 3 / (t·h); The third layer of spray gun wind (air) back pressure is 75kPa, and the spray gun wind supply intensity is 14000Nm 3 / (t·h); the outermost sleeve wind (air) back pressure is 50kPa, and the sleeve wind supply strength is 7200Nm 3 / (t·h).

[0021] If there is no special explanation, the particle size of the blue charcoal used in the present invention is 6mm~13mm, and the particle size of the pulverized coal is 0.1mm~6mm. When blue charcoal is not used as a substitute and only pulverized coal is sprayed, the amount of pulverized coal in the central coal gun corresponding to each ton of copper concentrate ore powder (i.e., ore material, excluding auxiliary materials) is 15kg~25kg; in the embodiment, when blue charcoal is not used as a substitute and only pulverized coal is sprayed in the central coal gun, the specific amount of pulverized coal is 2.5t / h (16kg pulverized coal per ton of ore material).

[0022] (3) When the copper matte grade reaches 58%, record the center temperature and side wall temperature of the molten pool, release a portion of the copper matte and slag through the weir to enter the subsequent process, so that the molten pool height is maintained at about 2000mm, and take slag samples and copper matte for analysis. The slag viscosity is tested in accordance with the YB / T 185-2017 standard.

[0023] The Ausmelt furnace spray gun structure of the present invention is as follows Figure 1 shown.

[0024] The above basic process is only an example of the copper smelting related process of the carbon-rich wind-borne blue charcoal injection method in the embodiment of the present invention, and does not limit the basic process applicable to the injection method of the present invention. In production practice, various parameters can be adjusted as needed.

[0025] Example 1: 50% of pulverized coal is replaced by semi-coke, and the CO2 content in the carbon-rich air of the central coal gun is 60%, and the CO content is 40%.

[0026] (1) There was no sudden increase in coal gun pressure during the injection process, and the injection was smooth; (2) The center temperature of the molten pool is 1325°C, the side wall temperature is 1177°C, and the temperature difference between the center and the side wall is about 148°C; (3) The average Fe3O4 content of the slag is 9.8%, the concentration difference between the center and the side wall is about 5.0%, and the viscosity of the slag is about 0.95 Pa·s.

[0027] Example 2: Semi-coke replaces 50% of pulverized coal, and the CO2 content in the carbon-rich air of the central coal gun is 55%, and the CO content is 45%.

[0028] (1) The spraying process is smooth without blockage; (2) The center temperature of the molten pool is 1315°C, the side wall temperature is 1192°C, and the temperature difference between the center and the side wall is about 123°C; (3) The average Fe3O4 content of the slag is 8.9%, the concentration difference is about 4.7%, and the viscosity drops to 0.86 Pa·s.

[0029] Example 3: Semi-coke replaces 50% of pulverized coal, and the CO2 content and CO content of the carbon-rich air from the central coal gun are 50% and 50%, respectively.

[0030] (1) The spraying process is smooth without blockage; (2) The center temperature of the molten pool is 1295°C, the side wall temperature is 1212°C, and the temperature difference between the center and the side wall is about 83°C; (3) The average Fe3O4 content of the slag is 7.6%, the concentration difference is about 4.1%, and the viscosity drops to 0.65 Pa·s.

[0031] Example 4 Under the condition that the carbon-rich air of the central coal gun is 50% CO + 50% CO2, the proportion of semi-coke replacing pulverized coal is reduced to 40%.

[0032] (1) The injection process is smooth and there is no abnormality in the coal gun pressure; (2) The center temperature of the molten pool is 1310°C, the side wall temperature is 1203°C, and the temperature difference between the center and the side wall is 107°C; (3) The average Fe3O4 content of the slag is 9.3%, the concentration difference between the center and the side wall is 4.8%, and the viscosity further drops to 0.78 Pa·s.

[0033] Example 5 Under the condition that the carbon-rich air of the central coal gun is 50% CO + 50% CO2, the proportion of semi-coke replacing pulverized coal increases to 60%.

[0034] (1) There was no blockage during the injection process and the coal gun pressure was stable; (2) The center temperature of the molten pool is 1290°C, the side wall temperature is 1219°C, and the temperature difference between the center and the side wall is reduced to 71°C; (3) The average Fe3O4 content of the slag is 6.5%, the concentration difference between the center and the side wall is 3.8%, and the viscosity drops to 0.5 Pa·s.

[0035] Comparative Example 1 The blue coke replaces 50% of the pulverized coal, and the blue coke particle size is 0.1 mm to 6 mm; ordinary air is used as the carrier gas of the central coal gun. The remaining steps are the same as those in Example 1.

[0036] (1) Use semi-coke with a particle size of 0.1 mm to 6 mm for injection. Since the particle size is too small, semi-coke and pulverized coal are easy to aggregate during the injection process, resulting in reduced injection efficiency; (2) The coal gun pressure increased abnormally during the injection process, indicating that blockage occurred, affecting the continuity and uniformity of the injection; (3) The center temperature of the molten pool is 1340°C, the side wall temperature is 1135°C, and the temperature difference between the center and the side wall is 205°C; (4) The average Fe3O4 content of the slag is 17.2%, the concentration difference between the center and the side wall is 8.0%, and the viscosity is 1.28 Pa·s.

[0037] Comparative Example 2 The blue carbon replaces 50% of the pulverized coal, and the blue carbon particle size is 13 mm to 50 mm. Ordinary air is used as the carrier gas. The remaining steps are the same as those in Example 1.

[0038] (1) Using semi-coke with a particle size of 13 mm to 50 mm for spraying, the semi-coke cannot be effectively sprayed into the molten pool due to its large particle size, resulting in poor spraying effect; (2) During the injection process, the coal gun pressure was continuously high, and blockages occurred multiple times during the injection process, which seriously affected the injection efficiency; (3) The center temperature of the molten pool is 1266°C, the side wall temperature is 1105°C, and the temperature difference between the center and the side wall is 161°C; (4) The average Fe3O4 content of the slag is 19.0%, the concentration difference between the center and the side wall is 10.5%, and the viscosity is 1.35 Pa·s.

[0039] Comparative Example 3 The central coal gun only sprays pulverized coal, does not use blue coal as a substitute, and uses ordinary air as a carrier gas. The remaining steps are the same as those in Example 1.

[0040] (1) The pulverized coal has a small particle size, high ash content, and fast reaction speed, which leads to high temperature in the center of the molten pool and uneven heat transfer. Ordinary air is used as the coal-carrying air for injection. The air contains about 21% oxygen, which is not conducive to the reduction reaction. (2) The center temperature of the molten pool is 1360°C, the side wall temperature is 1120°C, and the temperature difference between the center and the side wall is 240°C; (3) The average Fe3O4 content of the slag is 14.7%, the concentration difference between the center and the side wall is 7.7%, and the viscosity is 1.38 Pa·s.

[0041] Comparative Example 4 The central coal gun only sprays pulverized coal, and does not use blue coal as a substitute. The carbon-rich air of the central coal gun has a CO2 content of 60% and a CO content of 40%. The remaining steps are the same as those in Example 1.

[0042] (1) Pulverized coal has a small particle size, high ash content, and fast reaction speed. When carbon-rich air is used as the coal-carrying air for injection, the pulverized coal reacts with CO2 to absorb heat, resulting in a high temperature in the center of the molten pool and uneven heat transfer. (2) The center temperature of the molten pool is 1347°C, the side wall temperature is 1152°C, and the temperature difference between the center and the side wall is 195°C; (3) The average Fe3O4 content of the slag is 13.6%, the concentration difference between the center and the side wall is 6.8%, and the viscosity is 1.19 Pa·s.

[0043] The following conclusions can be drawn from the above embodiments and comparative examples: (1) It can be seen from Examples 1 to 3 that when the amount of blue coke replacing pulverized coal is the same, the higher the CO content in the carbon-rich gas, the lower the temperature difference between the center and side walls of the molten pool, the lower the slag viscosity, the average concentration of Fe3O4, and the concentration difference between the center and side walls.

[0044] (2) It can be seen from Examples 3 to 5 that when the amount of CO in the carbon-rich gas is the same, the higher the proportion of blue coke replacing pulverized coal, the lower the temperature difference between the center and side walls of the molten pool, the lower the slag viscosity, the average concentration of Fe3O4, and the concentration difference between the center and side walls.

[0045] (3) It can be seen from comparative examples 1 to 4 that when air or carbon-rich wind is used as the carrier gas, only pulverized coal is blown, or the particle size of the semi-coke replacing pulverized coal is small or large, the blowing effect is not ideal.

Claims

1. A method for spraying blue carbon with carbon-rich air in an Ausmelt furnace, wherein the top-blowing lance is composed of four layers of concentric sleeves, the innermost central coal lance sprays pulverized coal and air, the second layer oxygen lance sprays oxygen, the third layer sprays air to form lance wind, and the outermost layer sprays air to form sleeve wind, characterized in that: The pulverized coal in the innermost layer of the top-blowing spray gun is replaced with lignite, and the blowing air in the innermost layer of the top-blowing spray gun is replaced with carbon-rich gas; the carbon-rich gas includes a mixture of CO and CO2, and the carbon-rich gas is used as a carrier gas to be sprayed into the furnace through the spray gun together with lignite and pulverized coal.

2. The method for injecting carbon-rich wind-borne semi-coke in an Ausmelt furnace according to claim 1, characterized in that: The CO accounts for 40% to 50% of the carbon-rich gas, and the CO2 accounts for 50% to 60% of the carbon-rich gas.

3. The method for injecting carbon-rich wind-borne semi-coke in an Ausmelt furnace according to claim 1, characterized in that: The blue carbon replaces 40% to 60% of pulverized coal.

4. The method for injecting carbon-rich wind-borne semi-coke in an Ausmelt furnace according to claim 1, characterized in that: The particle size of the blue charcoal is 6 mm to 13 mm.

5. A method for injecting carbon-rich wind-borne semi-coke in an Ausmelt furnace according to any one of claims 1 to 4, characterized in that: The top-blowing lance parameters for each ton of charge are as follows: the carbon-rich gas back pressure of the innermost center coal gun of the top-blowing lance is 20kPa~30kPa, and the carbon-rich gas supply intensity is 400Nm 3 / (t·h)~500Nm 3 / (t·h).

6. A method for injecting carbon-rich wind-borne semi-coke in an Ausmelt furnace according to any one of claims 1 to 4, characterized in that: The oxygen back pressure of the second oxygen lance of the top-blowing spray gun is 78kPa~90kPa, and the oxygen supply intensity is 25000Nm 3 / (t·h)~27000Nm 3 / (t·h).

7. A method for injecting carbon-rich wind-borne semi-coke in an Ausmelt furnace according to any one of claims 1 to 4, characterized in that: The third layer of top-blowing spray gun has a back pressure of 68kPa~78kPa and a gas supply intensity of 13500Nm 3 / (t·h)~15000Nm 3 / (t·h).

8. A method for injecting carbon-rich wind-borne semi-coke in an Ausmelt furnace according to any one of claims 1 to 4, characterized in that: The wind back pressure of the outermost sleeve of the top-blowing spray gun is 47kPa~52kPa, and the air supply intensity is 7000Nm 3 / (t·h)~7400Nm 3 / (t·h).

9. A method for injecting carbon-rich wind-borne semi-coke in an Ausmelt furnace according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) Mix the semi-coke and pulverized coal and send them into the top-blowing lance; (2) copper ore and auxiliary materials are fed into the molten pool, and after the top-blowing lance is lowered to the specified production height, the pressure of the carbon-rich gas in the innermost center coal lance of the lance is adjusted for spraying, and the semi-coke, pulverized coal and carbon-rich gas are sprayed into the molten pool; (3) When the copper matte grade reaches 58%~62%, record the center temperature and side wall temperature of the molten pool and take slag samples for analysis.

10. The method for injecting carbon-rich wind-borne semi-coke in an Ausmelt furnace according to claim 5, characterized in that: The furnace charge includes mineral material, coal and sand; the feeding speed is 150t / h~180t / h for mineral material, 1t / h~3t / h for coal and 10t / h~20t / h for sand.

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