Method for starting new converter by using high-silicon molten iron for 120-ton dry dedusting converter

Abstract

The invention provides a method for opening a new furnace by using high-silicon molten iron in a 120-ton dry dedusting converter, belongs to the technical field of steel smelting, and solves the problem that the difficulty of opening the new furnace by using the high-silicon molten iron in the existing dry dedusting converter is large. The method comprises the following steps: converter loading: loading molten iron and scrap steel into a 120-ton top-bottom combined blown converter; oxygen supply by the converter: igniting and supplying oxygen after the converter is loaded; the auxiliary materials are added for the first time after ignition, the auxiliary materials are added for the second time, the active lime is added in batches, and then the limestone and the active lime are added in batches; and converter end point control. According to the method, the converter quantity, the scrap steel quantity and the molten iron quantity are reasonably controlled, the complexity and uncertainty in the production process can be reduced, the stable molten pool depth of the converter in the smelting process can be ensured by accurately controlling the charging quantity, and therefore the production efficiency and the product quality are improved, the production cost is reduced, energy consumption is optimized, and the economic benefit is increased. Unnecessary energy consumption and waste generation are reduced, and environmental protection and sustainable development are facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of steel smelting, and in particular relates to a method for starting a new furnace using high-silicon molten iron in a 120-ton dry dust removal converter. Background Art

[0002] The steelmaking converter is a steel smelting equipment commonly used in industrial production. It uses high temperature and high pressure to refine raw materials such as pig iron and scrap steel to produce high-strength and high-toughness steel that meets international standards. Opening the furnace means adding appropriate charge and fuel to the molten raw materials in the furnace, starting the furnace body, and starting smelting production.

[0003] The opening of the steelmaking converter is an important part of modern steelmaking technology. It can produce high-strength steels with different strengths, hardness, toughness and corrosion resistance, which are widely used in machinery manufacturing, shipbuilding and aerospace, automobile military industry, construction engineering and other fields. It is of great significance to improve steel production efficiency, reduce production costs, and promote industrial modernization and economic development.

[0004] The quality of opening a new furnace has a great impact on the life of the converter lining. Usually, a steelmaking company is equipped with one blast furnace and two converters. Production practice shows that the erosion rate of the new converter lining is generally much greater than that in the middle and late stages. After the converter is baked, the smelting of the first three furnaces is crucial. In the early stage of blast furnace opening, all high-silicon molten iron is used. If the converter is opened with high-silicon molten iron, although it can reduce the loss of cast iron and turn the molten iron into qualified steel billets as soon as possible, the smelting process of high-silicon molten iron reacts violently, and it is easy to cause large splashes that cause equipment burns or personnel scalds, and the smelting is more difficult; if the furnace is opened after the silicon content of the molten iron is reduced, although the furnace opening smelting process is relatively stable, the cast iron cycle is too long, the steelmaking output loss is large, and the cost reduction is affected. Summary of the invention

[0005] The purpose of the present invention is to provide a method for starting a new furnace with a 120-ton dry dust removal converter using high-silicon molten iron, so as to solve the problem that it is difficult to start a new furnace with high-silicon molten iron in the existing dry dust removal converter.

[0006] The technical solution of the present invention is: a method for starting a new furnace using high-silicon molten iron in a 120-ton dry dust removal converter, comprising the following steps: Step 1: Loading the converter: The 120-ton top and bottom double-blown converter is loaded with molten iron and scrap steel. The total loading capacity of the converter is 138-145 tons, the scrap steel is 10-30 tons, the molten iron is 115-135 tons, and the temperature of the molten iron is 1200-1250℃. The chemical composition percentage of the molten iron is: C ≥ 4.2%, Si: 1.5%-3.0%, Mn ≥ 1.5%, P ≥ 0.15%, S ≤ 0.03%, Fe: 91.24%, other uncontrollable elements Bi, Pb, Sb, As, Sn: 0.385% ± 0.1%; Step 2: Oxygen supply to converter: After the converter is loaded, it is ignited and oxygen is supplied for 5-6 minutes. When the CO content reaches 2.5-3%, the slag is removed by a gun and the carbon-oxygen reaction begins. After smelting and supplying oxygen for 10-12 minutes, the terminal carbon pulling reaction begins. Step 3: Converter slag making: In step 2, after the ignition is normal, the auxiliary materials are added for the first time, and 3-6 tons of active lime, 2-4 tons of limestone, 1 ton of magnesium balls, and 1-2 tons of dust removal ash balls are added for the first time; After the oxygen supply time is greater than 3 minutes, add auxiliary materials for the second time. Add 1-2 tons of active lime and 1±0.2 tons of dust removal ash pellets; When the CO content begins to change, add active lime in batches, with each batch being 0.2-0.5 tons; when the CO content is ≥22%, add 1 ton of limestone and 0.5 tons of dust ash for briquetting, and then add limestone and active lime in batches, with each batch being 0.5-0.8 tons; Step 4: Converter endpoint control: The reaction endpoint controls the C content to be ≥0.08%, and the final tapping temperature is 1640-1750°C.

[0007] As a further improvement of the present invention, in step 2, a stepped oxygen supply mode is adopted during ignition, the gun position height is +700 to +800 mm of the measured liquid level, and the oxygen flow rate is 18000-22000 Nm 3 / h.

[0008] As a further improvement of the present invention, in step 2, after ignition is normal, the oxygen gun position is +100 to +200mm of the measured liquid level, and the oxygen flow rate is 27500-28500Nm 3 / h.

[0009] As a further improvement of the present invention, in step 2, the gun is lifted and the slag is poured. The gun position of the second lowering of the gun is the measuring gun position +100 to +200 mm, and after 15-20 seconds, the oxygen pressure is adjusted to a stepped oxygen supply mode.

[0010] As a further improvement of the present invention, in step 2, from the start of the carbon-oxygen reaction to the end of the carbon pulling reaction, the oxygen gun position is +200 to +300 mm of the measuring liquid level, and the oxygen flow rate is 26500-27500 Nm 3 / h.

[0011] As a further improvement of the present invention, in step 2, during the final carbon pulling reaction, the oxygen gun position and the measuring gun position liquid level are at the same height, and the oxygen flow rate is 28500-30000Nm 3 / h, the gun pressing time during the final carbon pulling reaction is not less than 60 seconds.

[0012] The beneficial effects of the present invention are as follows: The method reasonably controls the converter amount, scrap steel amount and molten iron amount when loading the converter, which can reduce the complexity and uncertainty of the production process. Accurate control of the charging amount can ensure that the converter maintains a stable molten pool depth during the smelting process, thereby improving production efficiency and product quality. Accurate charging amount control can reduce the waste of raw materials and reduce production costs, and also help to optimize energy consumption. By accurately controlling the charging amount, unnecessary energy consumption and waste generation can be reduced, which is beneficial to environmental protection and sustainable development.

[0013] The method reasonably controls the chemical composition of molten iron. The contents of silicon, manganese, phosphorus and other elements in the molten iron directly affect the temperature in the furnace and the slag-forming process. Silicon is an important heat-generating element. A reasonable silicon content can improve the smelting efficiency. The oxidation products of manganese can effectively promote the dissolution of lime, accelerate the slag-forming process, reduce the amount of flux and the erosion of the furnace lining. The phosphorus content directly affects the temperature and chemical reaction rate in the furnace. A reasonable phosphorus content helps to improve the smelting efficiency. The control of the molten iron composition can significantly affect the production cost. Reasonable control of the molten iron composition can optimize the cost and resource utilization while ensuring the smelting effect. The control of the molten iron composition has a direct impact on the quality of molten steel. Phosphorus and sulfur are harmful elements in steel. Too high a phosphorus content will affect the toughness and welding performance of the steel. Too high a sulfur content will cause hot brittleness. By controlling the contents of these harmful elements, the quality and performance of the molten steel can be significantly improved. The oxidation products of manganese can effectively promote the dissolution of lime and reduce the erosion of the furnace lining, thereby extending the furnace life. Reasonable chemical composition control can also reduce the viscosity of the slag and reduce the splashing phenomenon, further protecting the furnace lining.

[0014] When supplying oxygen to the converter, the method can increase the oxygen flow rate, increase the impact depth, and strengthen stirring by controlling the oxygen supply mode, the gun position height, and the oxygen flow rate during ignition and after normal ignition; when lifting the gun to pour slag, the lower gun position and the oxygen supply mode are controlled to reduce the oxygen flow rate, slow down the carbon-oxygen reaction rate, make the molten pool evenly heated, ensure the ferrous oxide content in the slag, and alleviate the dry-out phenomenon; during the terminal carbon pulling reaction, the oxygen gun position, oxygen flow rate, and gun pressing time are controlled to strengthen the stirring of the molten pool, make the composition and temperature uniform, stabilize the flame, facilitate carbon pulling, reduce the ferrous oxide content in the slag, and improve the metal recovery rate.

[0015] The method can effectively adjust the furnace temperature by controlling the addition of auxiliary materials during converter slag making, ensure that the converter reaches thermal equilibrium during the blowing process, avoid excessively high or low temperatures, and thus prevent the occurrence of splashing; the addition of auxiliary materials can adjust the alkalinity and redox environment in the furnace, help control elements such as oxygen and sulfur in molten steel, thereby improving the desulfurization and dephosphorization effects of the molten steel, and ultimately improving the chemical composition and overall quality of the molten steel; by accurately controlling the amount and timing of the addition of auxiliary materials, the consumption of molten iron and additives can be reduced, unnecessary waste can be reduced, the smelting time can be shortened, and the production cost can be further reduced; accurate control of the addition of auxiliary materials can reduce splashing and environmental pollution, protect the environment and the safety of operators, and improve the safety of production.

[0016] The method controls the C content and the tapping temperature at the converter end point. Controlling the C content at the converter reaction end point can improve the metal recovery rate and the alloy absorption rate, while extending the furnace life, reducing the gas and non-metallic inclusions in the molten steel, and improving the purity of the molten steel; saving the amount of alloy: the molten steel at the end point has low oxidation and high residual manganese, which can save the amount of ferromanganese and other deoxidized alloys; reducing oxygen consumption and smelting cycle: small oxygen consumption, short smelting cycle, and high production efficiency; improving the quality of molten steel and extending the life of the furnace lining: reasonable control of the end point carbon content is conducive to improving the quality of molten steel and increasing the life of the converter; controlling the tapping temperature at the converter end point can reduce the erosion of the furnace lining, increase the life of the converter, and thus extend the service life of the converter; reducing iron oxidation loss, shortening the blowing time, and improving productivity; reducing the erosion of refractory materials and improving steel quality. Reasonable temperature control is helpful to reduce the erosion of refractory materials, thereby ensuring the quality of steel; it is conducive to stabilizing the smelting process and facilitating the coordination of the converter and continuous casting.

[0017] This method can avoid metal splashing, reduce the exposed area of ​​molten metal, ensure good slag penetration fluidity, reduce the loss of metal beads in the slag, avoid post-blowing, reduce unnecessary oxidation loss, reduce the slag volume, thereby reducing blowing loss, reduce the loss of residual metal, and further reduce oxidation blowing loss by controlling reasonable gun position, optimizing converter oxygen supply steps, converter slag quality, and adding auxiliary materials.

[0018] The method can organize the start-up of the converter by controlling the silicon content in the molten iron to be less than 3.0%. The smelting process of the first three furnaces is smooth, and the "6.9" reaction of the dry dust removal converter is effectively avoided, that is, during the converter steelmaking process, when the temperature in the furnace reaches a certain condition, MnO in the slag reacts with C to generate Mn and CO, which affects the composition and properties of the slag, and further affects the quality and efficiency of steelmaking; the conditions for the occurrence of the "6.9" reaction include the temperature in the furnace reaching a certain level and the MnO content in the slag being relatively high. By controlling the conditions such as the molten iron temperature entering the furnace and the final steel tapping temperature, the "6.9" reaction can be effectively avoided and the steelmaking process can be optimized. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below with reference to the embodiments.

[0020] Embodiment 1, Step 1: Loading the converter: The 120-ton top and bottom double-blown converter is loaded with molten iron and scrap steel. The total loading capacity of the converter is 138 tons, the scrap steel is 10 tons, and the molten iron is 115 tons. The temperature of the molten iron entering the furnace is 1200℃. The chemical composition percentage of the molten iron is: C is 4.2%, Si is 1.5%, Mn is 1.5%, P is 0.15%, S is 0.03%, Fe is 91.24%, and other uncontrollable elements Bi, Pb, Sb, As, Sn are 0.285%; Step 2: Oxygen supply to converter: After the converter is loaded, ignition and oxygen supply are carried out. The oxygen supply time is 5 minutes. During the ignition, a step-type oxygen supply mode is adopted. The gun position height is +700mm of the measured liquid level, and the oxygen flow rate is 18000Nm 3 / h, after normal ignition, the oxygen gun position is +100mm of the measured liquid level, and the oxygen flow rate is 27500Nm 3 / h; When the CO content reaches 2.5%, the gun is lifted and the slag is discharged to start the carbon-oxygen reaction. The gun position for the second time is the measuring gun position + 100mm. After 15 seconds, the oxygen pressure is adjusted to the step-type oxygen supply mode. After 10 minutes of oxygen supply, the terminal carbon pulling reaction begins. From the start of the carbon-oxygen reaction to the terminal carbon pulling reaction, the oxygen gun position is +200mm of the measuring liquid level, and the oxygen flow rate is 26500Nm 3 / h, during the final carbon pulling reaction, the oxygen gun position and the measuring gun position liquid level are at the same height, and the oxygen flow rate is 28500Nm 3 / h, and the gun pressing time during the final carbon pulling reaction is 60 seconds.

[0021] Step 3: Converter slag making: In step 2, after the ignition is normal, the auxiliary materials are added for the first time. The first auxiliary materials are 45% of the total amount of active lime, that is, 3 tons, 2 tons of limestone, 1 ton of magnesium balls, and the magnesium balls are added once after the ignition is successful, and 1 ton of dust ash is pressed into balls; After 4 minutes of oxygen supply, add auxiliary materials for the second time. Add 1 ton of active lime and 0.8 ton of dust removal ash pellets. When the CO content starts to change, add active lime in batches, 0.2 tons per batch; after the CO content reaches 22%, add 1 ton of limestone and 0.5 tons of dust ash briquette, and then add limestone and active lime in batches according to the oxygen supply time and the flame situation at the furnace mouth, 0.5 tons per batch; The first and second auxiliary materials are added between the time when the fire is ignited and the initial stage of the carbon-oxygen reaction, also known as the first batch of auxiliary materials. The first batch of auxiliary materials is added according to 60% of the total auxiliary materials. It is strictly forbidden to add the first batch of auxiliary materials into the furnace at one time. No auxiliary materials are added from 2 minutes before carbon pulling to the period of carbon pulling. A total of 8 tons of active lime, 8 tons of limestone, 2.5 tons of dust ash briquette, and 1 ton of magnesium balls were added to this furnace. Step 4: Converter endpoint control: The C content at the reaction endpoint is controlled to be 0.08%, and the final tapping temperature is 1640°C.

[0022] Embodiment 2, Step 1: Loading the converter: The 120-ton top and bottom double-blown converter is loaded with molten iron and scrap steel. The total loading capacity of the converter is 142 tons, the scrap steel is 20 tons, and the molten iron is 125 tons. The temperature of the molten iron entering the furnace is 1225℃. The chemical composition percentage of the molten iron is: C is 4.3%, Si is 2.4%, Mn is 1.6%, P is 0.16%, S is 0.029%, Fe is 91.24%, and other uncontrollable elements Bi, Pb, Sb, As, Sn are 0.385%; Step 2: Oxygen supply to converter: After the converter is loaded, ignition and oxygen supply are carried out. The oxygen supply time is 5.5 minutes. During the ignition, a step-type oxygen supply mode is adopted. The gun position height is +750mm of the measured liquid level, and the oxygen flow rate is 20000Nm 3 / h, after normal ignition, the oxygen gun position is +150mm of the measured liquid level, and the oxygen flow rate is 29500Nm 3 / h; When the CO content reaches 2.7%, the gun is lifted and the slag is discharged to start the carbon-oxygen reaction. The gun position for the second time is the measuring gun position + 150mm. After 17 seconds, the oxygen pressure is adjusted to the step-type oxygen supply mode. After 11 minutes of oxygen supply, the final carbon pulling reaction begins. From the start of the carbon-oxygen reaction to the final carbon pulling reaction, the oxygen gun position is +250mm of the measuring liquid level, and the oxygen flow rate is 27000Nm 3 / h, during the final carbon pulling reaction, the oxygen gun position and the measuring gun position liquid level are at the same height, and the oxygen flow rate is 29000Nm 3 / h, and the gun pressing time during the final carbon pulling reaction is 65 seconds.

[0023] Step 3: Converter slag making: In step 2, after the ignition is normal, the auxiliary materials are added for the first time. The first auxiliary materials are 50% of the total amount of active lime, that is, 4 tons, 3 tons of limestone, 1 ton of magnesium balls, and the magnesium balls are added once after the ignition is successful, and 2 tons of dust ash balls are added; After 5 minutes of oxygen supply, add auxiliary materials for the second time. Add 2 tons of active lime and 1 ton of dust removal ash pellets. Active lime is added in batches during the period when CO content begins to change, with each batch being 0.4 tons; after the CO content reaches 23%, 1 ton of limestone and 0.5 tons of dust ash are added for briquetting. Subsequently, limestone and active lime are added in batches according to the oxygen supply time and the flame conditions at the furnace mouth, with each batch being 0.6 tons; The first and second additions of auxiliary materials are made between the ignition of the fire and the initial stage of the carbon-oxygen reaction, also known as the first batch of auxiliary materials. The first batch of auxiliary materials is added according to 65% of the total auxiliary materials. It is strictly forbidden to add the first batch of auxiliary materials into the furnace at one time. No auxiliary materials shall be added from 2 minutes before carbon pulling to the period of carbon pulling. A total of 8 tons of lime, 4 tons of limestone, 2 tons of dust ash balls, and 0.85 tons of magnesium balls were added to this furnace.

[0024] Embodiment 3, Step 1: Loading the converter: The 120-ton top-bottom combined-blowing converter is loaded with molten iron and scrap steel. The total loading capacity of the converter is 145 tons, the scrap steel is 30 tons, and the molten iron is 135 tons. The temperature of the molten iron entering the furnace is 1250℃. The chemical composition percentage of the molten iron is: C is 4.4%, Si is 3.0%, Mn is 1.7%, P is 0.17%, S is 0.028%, Fe is 91.24%, and other uncontrollable elements Bi, Pb, Sb, As, Sn are 0.485%; Step 2: Oxygen supply to converter: After the converter is loaded, ignition and oxygen supply are carried out. The oxygen supply time is 6 minutes. During the ignition, a step-type oxygen supply mode is adopted. The gun position height is +800mm of the measured liquid level, and the oxygen flow rate is 22000Nm 3 / h, after normal ignition, the oxygen gun position is +200mm of the measured liquid level, and the oxygen flow rate is 28500Nm 3 / h; When the CO content reaches 3%, lift the gun and pour the slag to start the carbon-oxygen reaction. Lift the gun and pour the slag for the second time. The gun position is the measuring gun position + 200mm. After 20 seconds, adjust the oxygen pressure to the step-type oxygen supply mode. After 12 minutes of oxygen supply, the terminal carbon pulling reaction begins. From the start of the carbon-oxygen reaction to the terminal carbon pulling reaction, the oxygen gun position is +300mm of the measuring liquid level, and the oxygen flow rate is 27500Nm 3 / h, during the final carbon pulling reaction, the oxygen gun position and the measuring gun position liquid level are at the same height, and the oxygen flow rate is 28500-30000Nm 3 / h, and the gun pressing time during the final carbon pulling reaction is 70 seconds.

[0025] Step 3: Converter slag making: In step 2, after the ignition is normal, the auxiliary materials are added for the first time. The first auxiliary materials are 55% of the total amount of active lime, that is, 6 tons, 4 tons of limestone, 1 ton of magnesium balls, and the magnesium balls are added once after the ignition is successful, and 2 tons of dust ash balls are added; After 6 minutes of oxygen supply, add auxiliary materials for the second time. Add 2 tons of active lime and 1.2 tons of dust ash pellets. When the CO content starts to change, add active lime in batches, 0.5 tons per batch; after the CO content reaches 24%, add 1 ton of limestone and 0.5 tons of dust ash briquette, and then add limestone and active lime in batches according to the oxygen supply time and the flame situation at the furnace mouth, 0.8 tons per batch; The first and second additions of auxiliary materials are made between the ignition of the fire and the initial stage of the carbon-oxygen reaction, also known as the first batch of auxiliary materials. The first batch of auxiliary materials is added according to 70% of the total auxiliary materials. It is strictly forbidden to add the first batch of auxiliary materials into the furnace at one time. No auxiliary materials shall be added from 2 minutes before carbon pulling to the period of carbon pulling. A total of 8 tons of lime, 4 tons of limestone, 2 tons of dust ash balls, and 0.85 tons of magnesium balls were added to this furnace.

[0026] The relevant parameters of the converter opening of a new furnace using the present method in Example 1-3 are shown in Table 1.

[0027] By comparing the data in Table 1, it can be seen that the smelting process of the converter new furnace is stable when the production method is applied. Compared with the original method, the content of C, Mn, P, and S elements in the final molten steel composition of this method is qualified, the final temperature further meets the required range, the steel output is controlled and improved, and the oxidation blowing loss is greatly reduced. This method can quickly smelt high-silicon molten iron into qualified steel billets, effectively reducing the metal loss of converter smelting, and at least 2,000-3,000 tons of cast iron are guaranteed to be reduced in the entire cycle, and the cost of steel billets is reduced by at least 50 yuan / ton, which can increase efficiency by 100,000-150,000 yuan, which is conducive to cost reduction and achieving cost reduction and efficiency improvement in production.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for starting a new furnace using high silicon hot metal in a 120 ton dry dust removal converter, characterized in that: The following steps are involved: Step 1: Loading the converter: The 120-ton top and bottom double-blown converter is loaded with molten iron and scrap steel. The total loading capacity of the converter is 138-145 tons, the scrap steel is 10-30 tons, the molten iron is 115-135 tons, and the temperature of the molten iron is 1200-1250℃. The chemical composition percentage of the molten iron is: C ≥ 4.2%, Si: 1.5%-3.0%, Mn ≥ 1.5%, P ≥ 0.15%, S ≤ 0.03%, Fe: 91.24%, other uncontrollable elements Bi, Pb, Sb, As, Sn: 0.385% ± 0.1%; Step 2: Converter oxygen supply: After the converter is loaded, it is ignited and oxygen is supplied for 5-6 minutes. When the CO content reaches 2.5-3%, the slag is removed by a gun and the carbon-oxygen reaction begins. After smelting and supplying oxygen for 10-12 minutes, the terminal carbon pulling reaction begins. Step 3: Converter slag making: In step 2, after the ignition is normal, the auxiliary materials are added for the first time, and 3-6 tons of active lime, 2-4 tons of limestone, 1 ton of magnesium balls, and 1-2 tons of dust removal ash balls are added for the first time; After the oxygen supply time is greater than 3 minutes, add auxiliary materials for the second time. Add 1-2 tons of active lime and 1±0.2 tons of dust removal ash pellets; When the CO content begins to change, add active lime in batches, with each batch being 0.2-0.5 tons; when the CO content is ≥22%, add 1 ton of limestone and 0.5 tons of dust ash for briquetting, and then add limestone and active lime in batches, with each batch being 0.5-0.8 tons; Step 4: Converter endpoint control: The reaction endpoint controls the C content to be ≥0.08%, and the final tapping temperature is 1640-1750°C.

2. The method for starting a new furnace using high silicon hot metal in a 120 ton dry dust removal converter according to claim 1, characterized in that: In step 2, a stepped oxygen supply mode is used during ignition, the gun height is +700 to +800 mm of the measured liquid level, and the oxygen flow rate is 18000-22000 Nm 3 / h.

3. The method for starting a new furnace using high silicon hot metal in a 120 ton dry dust removal converter according to claim 1, characterized in that: In step 2, after normal ignition, the oxygen gun position is +100 to +200mm of the measured liquid level, and the oxygen flow rate is 27500-28500Nm 3 / h.

4. The method for starting a new furnace using high silicon hot metal in a 120 ton dry dust removal converter according to claim 1, characterized in that: In step 2, the gun is lifted and the slag is poured out for the second time, and the gun position is measured gun position +100 to +200mm. After 15-20 seconds, the oxygen pressure is adjusted to a stepped oxygen supply mode.

5. The method for starting a new furnace using high silicon hot metal in a 120 ton dry dust removal converter according to claim 1, characterized in that: In step 2, from the start of the carbon-oxygen reaction to the end of the carbon pulling reaction, the oxygen gun position is +200 to +300mm of the measuring liquid level, and the oxygen flow rate is 26500-27500Nm 3 / h.

6. The method for starting a new furnace using high silicon hot metal in a 120 ton dry dust removal converter according to claim 1, characterized in that: In step 2, during the final carbon pulling reaction, the oxygen gun position and the measuring gun position liquid level are at the same height, and the oxygen flow rate is 28500-30000Nm 3 / h, the gun pressing time during the final carbon pulling reaction is not less than 60 seconds.

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