Method for inhibiting elemental sulfur in top blowing smelting tail gas of copper smelting Ausmelt furnace

Abstract

The invention discloses a method for inhibiting elemental sulfur in top blowing smelting tail gas of a copper smelting Ausmelt furnace. The method comprises the following steps: (1) ensuring sulfur-oxygen balance in the Ausmelt furnace: strictly controlling the mass fraction of S in copper concentrate fed into the furnace to be stabilized at 25-35%; (2) reduction reaction of a molten pool is reduced, wherein furnace burden moisture is increased to replace SO2 to be reduced, and meanwhile the use amount of lump coal is reduced; (3) strengthening a molten pool sulfur oxidation reaction: increasing the total amount of air and oxygen of a spray gun, optimizing spray gun parameters and a material drop point position, and enhancing molten pool stirring and sulfur reaction efficiency; (4) intensifying secondary oxidation of elemental sulfur in the flue gas: maintaining micro-negative pressure of a hearth of the Australian furnace to delay the flow rate of the flue gas, and increasing blast at the upper part of the hearth to improve the oxidation atmosphere; according to the method, the content of elemental sulfur in the flue gas of the Australian furnace can be remarkably reduced, stable operation of rear-end equipment is guaranteed, equipment does not need to be newly added, low-cost inhibition of elemental sulfur in the top blowing smelting tail gas of the Australian furnace can be achieved through process optimization, and stable operation of a copper smelting system is effectively guaranteed.

Description

Technical Field

[0001] This invention relates to the field of copper pyrometallurgical technology, and in particular to a method for suppressing elemental sulfur in the tail gas of the top-blown smelting furnace in copper smelting. The method of this invention can solve the equipment failure problem caused by elemental sulfur entering the flue gas during the top-blown smelting process of the Ausmelt furnace. Background Technology

[0002] In the top-blown smelting process of the Austronesian furnace, copper concentrate (mainly composed of Cu, S, and Fe) undergoes melting and oxidation reactions under the action of oxygen-enriched gas in the lance. Most of the sulfur is oxidized to SO2, and a small amount enters the next process as matte (Cu2S-FeS). However, a small portion of sulfur is not fully oxidized due to high-temperature decomposition and directly sublimates into elemental sulfur (S) gas, which enters the flue gas in gaseous form. Although elemental sulfur does not affect the Austronesian furnace itself, it will cause the following problems: (1) adhesion of electrostatic precipitator ash, reducing dust removal efficiency; (2) blockage and corrosion of equipment in the acid production process, resulting in frequent failures. Existing technologies lack a low-cost and efficient control scheme for elemental sulfur in the flue gas of the Austronesian furnace, and a systematic process is urgently needed to solve this problem. Summary of the Invention

[0003] The purpose of this invention is to address the problem that in the current top-blown copper smelting process of the Ausmelt furnace, a small amount of sulfur is not fully oxidized during copper concentrate smelting and directly sublimates into elemental sulfur gas, which enters the flue gas, leading to problems such as adhesion of electrostatic precipitator ash, blockage and corrosion of acid production equipment. The invention provides a method to suppress elemental sulfur in the tail gas of the Ausmelt furnace top-blown copper smelting process.

[0004] The present invention provides a method for suppressing elemental sulfur in the top-blown smelting tail gas of an Austronesian copper smelting furnace, comprising the following steps:

[0005] (1) Ensure sulfur and oxygen balance inside the furnace

[0006] Strictly control the S mass fraction in the copper concentrate fed into the furnace to stabilize it at 25-35%. For ore with an S mass fraction >35% or S mass fraction <25%, multiple batching processes are used to stabilize the S mass fraction in the copper concentrate at 25-35% before feeding, ensuring sulfur-oxygen balance in the furnace.

[0007] (2) Reduce the reduction reaction in the molten pool

[0008] ①Increase the moisture content of the furnace charge: Start the top feeder to spray water and increase the water content in the furnace charge to 8-11%, so that water can replace SO2 and be reduced by coal and CO;

[0009] ② Reduce the amount of lump coal used: Reduce the amount of lump coal used from 2-3 t / h to 1-1.5 t / h, effectively reducing the reducing atmosphere on the surface of the molten pool and reducing the generation of elemental sulfur;

[0010] (3) Enhance the sulfur oxidation reaction in the molten pool and reduce the amount of elemental sulfur decomposed in the copper concentrate.

[0011] When elemental sulfur is detected at the flue gas outlet of the Austronesian furnace, reduce the blast oxygen concentration by 3-5% based on the current blast oxygen concentration, increase the copper matte grade, and increase the total oxygen supply to the blast lance to 15,000-17,000 Nm³. 3 / h, to enhance the sulfur reaction in the concentrate; during production, ensure that the air supply pressure of the spray gun is greater than 110kPa, the oxygen pressure is greater than 150kPa, the weight of the spray gun does not exceed 20 tons, the spray gun position is reduced from 2000mm to 1800mm, the spiral angle of the spray gun is modified to be horizontal, and the motor frequency of the furnace top feeder is adjusted so that the distance between the copper concentrate landing point and the spray gun nozzle is 950-1050mm, so as to enhance the stirring of the molten pool, mass and heat transfer, and more air and oxygen cover the copper concentrate, and ensure the reaction rate of sulfur in the concentrate;

[0012] (4) Enhance the secondary oxidation of elemental sulfur in flue gas

[0013] During normal production, maintain a slight negative pressure of -20Pa in the furnace chamber of the AB furnace to slow down the flue gas flow rate and increase the residence time of elemental sulfur in the secondary reaction zone. If the feedback from the downstream AB furnace indicates the presence of elemental sulfur in the tail gas, adjust the following order: ① If flammable materials such as circuit boards or bulk bags are being added, stop adding them immediately to prevent oxygen from preferentially reacting with flammable materials, thus reducing the oxidation of elemental sulfur; ② Increase the airflow of the AB furnace spray gun sleeve to 5000–9000 Nm³. 3 / h; ③ Increase the oxygen supply to 500-1200 Nm³ using the spray gun sleeve of the Australian furnace. 3 / h; ④ Start the Australian furnace insulation burner to blow air into the furnace at 2000-3000 Nm 3 / h, expanding the area affected by secondary ventilation;

[0014] After the above steps, the number of times elemental sulfur was detected in the tail gas of the Ausmet furnace in the sulfuric acid process was reduced to 0-1 times per six months, effectively ensuring the stable operation of the copper smelting system.

[0015] The multiple batching process described in step (1) of this invention includes: three batching processes for low-sulfur ore and two batching processes for high-sulfur ore. Currently, the copper ore sources within the applicant's company are complex. Low-sulfur ore mainly includes domestic ore, recycled materials, and slag concentrate, which have small inventories but significant differences in composition. By using a trolley-based batching method, a copper-containing material with uniform composition and large quantity is formed. The sulfur content of the material after batching is generally 20-25%, commonly known as low-sulfur ore. The three-stage batching of low-sulfur ore refers to: the first batching is the process of grabbing the raw materials required for low-sulfur ore into the first-stage mixing bin; the second batching is the process of randomly grabbing materials from the first-stage mixing bin into the second-stage mixing bin; and the third batching is the process of repeating the second batching operation to transfer the materials to the third-stage mixing bin. This method achieves the homogenization of low-sulfur ore. High-sulfur ore refers to extremely high-sulfur ore with a sulfur content >35%. High-sulfur ore is batched twice with other low-sulfur ore types with lower sulfur content until the sulfur content in the mixed ore is <35% before feeding. This can effectively avoid the generation of elemental sulfur in the tail gas of the furnace.

[0016] In step (2) of this invention, each furnace top feeder is equipped with a sprayer. When the moisture content of the copper concentrate is detected to be too low, the sprayer is activated to adjust the moisture content of the furnace charge to 8-11% according to the detection situation.

[0017] The principle of this invention is as follows: Addressing the problem that some sulfur elements are not fully oxidized during the Austronesian furnace smelting process and enter the flue gas as elemental sulfur (S2), leading to subsequent electrostatic precipitator ash adhesion and acid production equipment malfunctions, this invention suppresses elemental sulfur formation through systematic process control. Specifically, it includes the following measures:

[0018] (1) Prevent sulfur-oxygen imbalance, strengthen the uniformity of material batching and smooth feeding, implement three batching for low sulfur ore and special secondary batching for high sulfur ore with extreme composition, and prevent the insufficient oxidation of sulfur due to excessive material and insufficient oxygen in the furnace, thus forming elemental sulfur.

[0019] (2) Reduce the reduction in the molten pool by spraying water into the furnace charge through the top feeder to increase the moisture content of the furnace charge and use water to replace SO2 in the reduction of coal and CO; at the same time, reduce the amount of lump coal to reduce the CO produced by incomplete combustion, so as to reduce the reduction of SO2.

[0020] (3) Enhance the sulfur oxidation reaction in the molten pool: When elemental sulfur is detected at the flue gas outlet of the Austromette furnace, reduce the blast oxygen concentration by 3-5% based on the current blast oxygen concentration, improve the grade of copper matte, and increase the total oxygen content of the blast lance to 15,000-17,000 Nm. 3To enhance the sulfur reaction in the concentrate, during production, ensure the air pressure of the spray gun is greater than 110 kPa, the oxygen pressure is greater than 150 kPa, the weight of the spray gun does not exceed 20 tons, the spray gun position is reduced from 2000 mm to 1800 mm, the spiral angle of the spray gun is modified to be horizontal, and the frequency of the furnace top feeder motor is adjusted so that the distance between the copper concentrate landing point and the spray gun nozzle is 950-1050 mm. Through the above operations, the total amount of air and oxygen in the spray gun can be increased, the sulfur reaction in the concentrate can be enhanced, the stirring of the molten pool can be enhanced, the mass and heat transfer of the molten pool can be enhanced, and more air and oxygen can cover the material, ensuring the sulfur reaction rate of the concentrate.

[0021] (4) Enhance the secondary oxidation of elemental sulfur in flue gas: During normal production, maintain the furnace pressure of the AB furnace at a slight negative pressure of -20Pa, reduce the flue gas flow rate, and increase the residence time of elemental sulfur in the secondary reaction zone; if the feedback from the downstream AB furnace shows the presence of elemental sulfur in the tail gas, adjust according to the following order: ① If flammable materials such as circuit boards or ton bags are being added, stop adding them immediately to prevent oxygen from preferentially reacting with flammable materials, which would reduce the oxidation of elemental sulfur; ② Increase the air volume of the AB furnace spray gun sleeve to 5000-9000 Nm 3 / h; ③ Increase the oxygen supply to 500-1200 Nm³ using the spray gun sleeve of the Australian furnace. 3 / h; ④ Start the Australian furnace insulation burner to blow air into the furnace at 2000-3000 Nm 3 / h, expand the area affected by secondary blasting; through the above operations, the secondary reaction between elemental sulfur and oxygen in the flue gas can be enhanced. By maintaining a slight negative pressure in the furnace to slow down the flue gas flow rate, and increasing the blasting in the upper part of the furnace (such as sleeve air oxygenation, oxygen distribution and starting the heat-insulating burner), the oxidizing atmosphere in the secondary reaction zone above the furnace is enhanced, the flue gas flow rate is slowed down, and the residence time of elemental sulfur in the secondary reaction zone is increased, thereby minimizing the content of elemental sulfur in the flue gas.

[0022] The method of this invention can significantly reduce the elemental sulfur content in the flue gas of the Austronesian furnace, ensuring the stable operation of downstream equipment. No new equipment is required. Through process optimization, it is possible to suppress elemental sulfur in the top-blown smelting tail gas of the Austronesian furnace at low cost. The number of times elemental sulfur is detected in the Austronesian furnace smelting tail gas in the sulfuric acid process is reduced to 0-1 times / half a year, effectively ensuring the stable operation of the copper smelting system. Detailed Implementation

[0023] To better explain the technical solution of the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments. The following embodiments are merely illustrative of the technical solution of the present invention and do not limit the present invention in any way. The sequence numbers of the following embodiments are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0024] The process method of the present invention has been implemented in the applicant's company since January 2024.

[0025] Example 1

[0026] This example illustrates the process from January to March 2024 using the applicant's No. 1 Australian furnace smelting system.

[0027] A method for suppressing elemental sulfur in the top-blown smelting tail gas of an Ausmet furnace in copper smelting includes the following steps:

[0028] (1) Ensure sulfur and oxygen balance inside the furnace

[0029] Strictly control the S mass fraction in the copper concentrate fed into the furnace to stabilize it at 25-30%. For ore with an S mass fraction >35% or S mass fraction <25%, multiple batching processes are used to stabilize the S mass fraction in the copper concentrate at 25-30% before feeding, ensuring sulfur-oxygen balance in the furnace.

[0030] (2) Reduce the reduction reaction in the molten pool

[0031] ①Increase the moisture content of the furnace charge: Start the top feeder to spray water and increase the water content in the furnace charge to 8-10%, so that water can replace SO2 and be reduced by coal and CO;

[0032] ② Reduce the amount of lump coal used: Reduce the amount of lump coal used from 2-3 t / h to 1.0-1.3 t / h, effectively reducing the reducing atmosphere on the surface of the molten pool and reducing the generation of elemental sulfur;

[0033] (3) Enhance the sulfur oxidation reaction in the molten pool and reduce the amount of elemental sulfur decomposed in the copper concentrate.

[0034] When elemental sulfur is detected at the flue gas outlet of the Austronesian furnace, reduce the blast oxygen concentration by 3-4% based on the current blast oxygen concentration, increase the copper matte grade, and increase the total oxygen supply to the blast lance to 15,000-16,000 Nm³. 3 / h, to enhance the sulfur reaction in the concentrate; during production, ensure that the air supply pressure of the spray gun is greater than 110kPa, the oxygen pressure is greater than 150kPa, the weight of the spray gun does not exceed 20 tons, the spray gun position is reduced from 2000mm to 1800mm, the spiral angle of the spray gun is modified to be horizontal, and the motor frequency of the furnace top feeder is adjusted so that the distance between the copper concentrate landing point and the spray gun nozzle is 1000mm, so as to enhance the stirring of the molten pool, mass and heat transfer, and more air and oxygen cover the copper concentrate, and ensure the reaction rate of sulfur in the concentrate;

[0035] (4) Enhance the secondary oxidation of elemental sulfur in flue gas

[0036] During normal production, maintain a slight negative pressure of -20Pa in the furnace chamber of the AB furnace to slow down the flue gas flow rate and increase the residence time of elemental sulfur in the secondary reaction zone. If the feedback from the downstream AB furnace indicates the presence of elemental sulfur in the tail gas, adjust the process in the following order: ① If flammable materials such as circuit boards or bulk bags are being added, stop adding them immediately to prevent oxygen from preferentially reacting with flammable materials, thus reducing the oxidation of elemental sulfur; ② Increase the airflow of the AB furnace spray gun sleeve to 5000–7000 Nm³. 3 / h; ③ Increase the oxygen supply to 500-800 Nm³ using the spray gun sleeve of the Australian furnace. 3 / h; ④ Start the Australian furnace insulation burner to blow air into the furnace at 2000~2500Nm 3 / h, expanding the area affected by secondary ventilation;

[0037] During operation using the process parameters of this embodiment, the acid production process did not report any elemental sulfur in the tail gas. Since the shutdown time for elemental sulfur in the tail gas was zero, the system operated smoothly and stably.

[0038] Example 2

[0039] This example illustrates the process from April to June 2024 using the applicant's No. 1 Australian furnace smelting system.

[0040] A method for suppressing elemental sulfur in the top-blown smelting tail gas of an Ausmet furnace in copper smelting includes the following steps:

[0041] (1) Ensure sulfur and oxygen balance inside the furnace

[0042] Strictly control the S mass fraction in the copper concentrate fed into the furnace to stabilize it at 28-32%. For ore with an S mass fraction >35% or S mass fraction <25%, multiple batching processes are used to stabilize the S mass fraction in the copper concentrate at 28-32% before feeding, ensuring sulfur-oxygen balance in the furnace.

[0043] (2) Reduce the reduction reaction in the molten pool

[0044] ①Increase the moisture content of the furnace charge: Start the top feeder to spray water and increase the water content in the furnace charge to 9-11%, so that water can replace SO2 and be reduced by coal and CO;

[0045] ② Reduce the amount of lump coal used: Reduce the amount of lump coal used from 2-3 t / h to 1.1-1.4 t / h, effectively reducing the reducing atmosphere on the surface of the molten pool and reducing the generation of elemental sulfur;

[0046] (3) Enhance the sulfur oxidation reaction in the molten pool and reduce the amount of elemental sulfur decomposed in the copper concentrate.

[0047] When elemental sulfur is detected at the flue gas outlet of the Ausmet furnace, reduce the blast oxygen concentration by 4-5% based on the current blast oxygen concentration, increase the copper matte grade, and increase the total oxygen supply to the blast lance to 16000-17000 Nm³. 3 / h, to enhance the sulfur reaction in the concentrate; during production, ensure that the air supply pressure of the spray gun is greater than 110kPa, the oxygen pressure is greater than 150kPa, the weight of the spray gun does not exceed 20 tons, the spray gun position is reduced from 2000mm to 1800mm, the spiral angle of the spray gun is modified to be horizontal, and the motor frequency of the furnace top feeder is adjusted so that the distance between the copper concentrate landing point and the spray gun nozzle is 950mm, so as to achieve the purpose of enhancing the stirring of the molten pool, mass and heat transfer, and more air and oxygen covering the copper concentrate, and ensuring the reaction rate of sulfur in the concentrate;

[0048] (4) Enhance the secondary oxidation of elemental sulfur in flue gas

[0049] During normal production, maintain a slight negative pressure of -20Pa in the furnace chamber of the AB furnace to slow down the flue gas flow rate and increase the residence time of elemental sulfur in the secondary reaction zone. If the feedback from the downstream AB furnace indicates the presence of elemental sulfur in the tail gas, adjust the process in the following order: ① If flammable materials such as circuit boards or bulk bags are being added, stop adding them immediately to prevent oxygen from preferentially reacting with flammable materials, thus reducing the oxidation of elemental sulfur; ② Increase the airflow of the AB furnace spray gun sleeve to 6000–8000 Nm³. 3 / h; ③ Increase the oxygen supply to 800-1200 Nm³ using the spray gun sleeve of the Australian furnace. 3 / h; ④ Start the Australian furnace heat-insulating burner to blow air into the furnace at 2400~3000Nm 3 / h, expanding the area affected by secondary ventilation;

[0050] During operation using the process parameters of this embodiment, the acid production process only reported the presence of elemental sulfur in the tail gas once. After timely treatment, the level of elemental sulfur in the tail gas decreased rapidly, and the furnace was not shut down due to the presence of elemental sulfur in the tail gas. The system operated smoothly and stably.

[0051] Example 3

[0052] This example illustrates the process from July 2024 to December 2024 using the applicant's No. 1 Australian furnace smelting system as an example.

[0053] A method for suppressing elemental sulfur in the top-blown smelting tail gas of an Ausmet furnace in copper smelting includes the following steps:

[0054] (1) Ensure sulfur and oxygen balance inside the furnace

[0055] Strictly control the S mass fraction in the copper concentrate fed into the furnace to stabilize it at 25-35%. For ore with an S mass fraction >35% or S mass fraction <25%, multiple batching processes are used to stabilize the S mass fraction in the copper concentrate at 25-35% before feeding, ensuring sulfur-oxygen balance in the furnace.

[0056] (2) Reduce the reduction reaction in the molten pool

[0057] ①Increase the moisture content of the furnace charge: Start the top feeder to spray water and increase the water content in the furnace charge to 8-11%, so that water can replace SO2 and be reduced by coal and CO;

[0058] ② Reduce the amount of lump coal used: Reduce the amount of lump coal used from 2-3 t / h to 1.1-1.5 t / h, effectively reducing the reducing atmosphere on the surface of the molten pool and reducing the generation of elemental sulfur;

[0059] (3) Enhance the sulfur oxidation reaction in the molten pool and reduce the amount of elemental sulfur decomposed in the copper concentrate.

[0060] When elemental sulfur is detected at the flue gas outlet of the Austronesian furnace, reduce the blast oxygen concentration by 3-5% based on the current blast oxygen concentration, increase the copper matte grade, and increase the total oxygen supply to the blast lance to 15,000-17,000 Nm³. 3 / h, to enhance the sulfur reaction in the concentrate; during production, ensure that the air supply pressure of the spray gun is greater than 110kPa, the oxygen pressure is greater than 150kPa, the weight of the spray gun does not exceed 20 tons, the spray gun position is reduced from 2000mm to 1800mm, the spiral angle of the spray gun is modified to be horizontal, and the motor frequency of the furnace top feeder is adjusted so that the distance between the copper concentrate landing point and the spray gun nozzle is 950-1050mm, so as to enhance the stirring of the molten pool, mass and heat transfer, and more air and oxygen cover the copper concentrate, and ensure the reaction rate of sulfur in the concentrate;

[0061] (4) Enhance the secondary oxidation of elemental sulfur in flue gas

[0062] During normal production, maintain a slight negative pressure of -20Pa in the furnace chamber of the AB furnace to slow down the flue gas flow rate and increase the residence time of elemental sulfur in the secondary reaction zone. If the feedback from the downstream AB furnace indicates the presence of elemental sulfur in the tail gas, adjust the following order: ① If flammable materials such as circuit boards or bulk bags are being added, stop adding them immediately to prevent oxygen from preferentially reacting with flammable materials, thus reducing the oxidation of elemental sulfur; ② Increase the airflow of the AB furnace spray gun sleeve to 5000–9000 Nm³. 3 / h; ③ Increase the oxygen supply to 500-1200 Nm³ using the spray gun sleeve of the Australian furnace. 3 / h; ④ Start the Australian furnace insulation burner to blow air into the furnace at 2000-3000 Nm 3 / h, expanding the area affected by secondary ventilation;

[0063] During operation using the process parameters of this embodiment, the acid production process did not report any elemental sulfur in the tail gas. Since the shutdown time for elemental sulfur in the tail gas was zero, the system operated smoothly and stably.

[0064] The operation of the method of this invention has reduced the number of times the applicant's acid production process feeds back elemental sulfur from more than 10 times per month in the early stage to 0-2 times per year in the later stage. The shutdown time due to elemental sulfur issues in 2024-2025 was zero, effectively ensuring the stable operation of the applicant's copper smelting system.

[0065] The above embodiments are merely specific examples exemplified to explain the present invention and do not limit the present invention in any way. Any non-substantial changes made by any person based on the above content and form that do not depart from the scope of protection of the claims of the present invention should be considered to fall within the scope of protection of the claims of the present invention. The present invention is not limited to the specific embodiments described above.

Claims

1. A method for suppressing elemental sulfur in the top-blown smelting tail gas of an Austronesian copper smelting furnace, characterized in that... Includes the following steps: (1) Ensure sulfur and oxygen balance inside the furnace Strictly control the S mass fraction in the copper concentrate fed into the furnace to stabilize it at 25-35%. For ore with an S mass fraction >35% or S mass fraction <25%, multiple batching processes are used to stabilize the S mass fraction in the copper concentrate at 25-35% before feeding, ensuring sulfur-oxygen balance in the furnace. (2) Reduce the reduction reaction in the molten pool ①Increase the moisture content of the furnace charge: Start the top feeder to spray water and increase the water content in the furnace charge to 8-11%, so that water can replace SO2 and be reduced by coal and CO; ② Reduce the amount of lump coal used: Reduce the amount of lump coal used from 2-3 t / h to 1-1.5 t / h, effectively reducing the reducing atmosphere on the surface of the molten pool and reducing the generation of elemental sulfur; (3) Enhance the sulfur oxidation reaction in the molten pool When elemental sulfur is detected at the flue gas outlet of the Austronesian furnace, reduce the blast oxygen concentration by 3-5% based on the current blast oxygen concentration, and increase the total oxygen output from the spray gun to 15,000-17,000 Nm³. 3 / h, to enhance the sulfur reaction in the concentrate; during production, ensure that the air supply pressure of the spray gun is greater than 110kPa, the oxygen pressure is greater than 150kPa, the weight of the spray gun does not exceed 20 tons, the spray gun position is reduced from 2000mm to 1800mm, the spiral angle of the spray gun is modified to be horizontal, and the motor frequency of the furnace top feeder is adjusted so that the distance between the copper concentrate landing point and the spray gun nozzle is 950-1050mm, so as to enhance the stirring of the molten pool, mass and heat transfer, and more air and oxygen cover the copper concentrate, and ensure the reaction rate of sulfur in the concentrate; (4) Enhance the secondary oxidation of elemental sulfur in flue gas During normal production, the furnace pressure of the Australian furnace is maintained at a slight negative pressure of -20Pa to slow down the flue gas flow rate and increase the residence time of elemental sulfur in the secondary reaction zone. If the backend feedback indicates the presence of elemental sulfur in the AB furnace exhaust gas, adjust the following steps in order: ① If flammable materials such as circuit boards or bulk bags are being added, immediately stop adding them to prevent oxygen from preferentially reacting with flammable materials, thus reducing the oxidation of elemental sulfur; ② Increase the airflow of the AB furnace spray gun sleeve to 5000–9000 Nm³. 3 / h; ③ Increase the oxygen supply to 500-1200 Nm³ using the spray gun sleeve of the Australian furnace. 3 / h; ④ Start the Australian furnace insulation burner to blow air into the furnace at 2000-3000 Nm 3 / h, expanding the area affected by secondary ventilation; After the above steps, the number of times elemental sulfur was detected in the tail gas of the Ausmet furnace in the sulfuric acid process was reduced to 0-1 times per six months.

2. The method for suppressing elemental sulfur in the top-blown smelting tail gas of an Austronesian copper smelting furnace according to claim 1, characterized in that: The multiple batching process mentioned in step (1) includes: three batching processes for low-sulfur ore; and two batching processes for high-sulfur ore.

3. The method for suppressing elemental sulfur in the top-blown smelting tail gas of an Austronesian furnace according to claim 1, characterized in that: Each furnace top feeder described in step (2) is equipped with a sprayer. When the moisture content of the copper concentrate is detected to be too low, the sprayer is activated to adjust the moisture content of the furnace charge to 8-11% according to the detection situation.