Method for dynamically stabilizing the amount of slag in a converter smelting

Abstract

The application provides a method for dynamically keeping the slag amount of a stable converter smelting. The application ensures the stability of the smelting process by keeping the slag amount in the converter constant. According to the relationship between the measured slag amount of the converter and the splashing time, the initial slag amount of the slag-keeping furnace is determined. The addition amount of the slag amount is confirmed by the molten iron condition. The increment of the slag amount in the smelting process is calculated according to the slag amount consumption. The decrement of the slag amount in the smelting and tapping process is confirmed according to the splashing condition in the smelting process and the slag falling condition of the large furnace mouth in the tapping process. The slag amount in the rocking furnace slag tapping process is confirmed according to the furnace type condition. According to the increment and decrement of the slag amount, the dynamic stable slag keeping operation of the converter smelting process is realized, the slag amount in the smelting process of each furnace is kept in a constant state, the lance position operation adjustment is facilitated, the converter splashing amount is reduced, the converter end point temperature and the composition control precision are improved, the molten steel quality is improved, and the smelting cost is reduced, which is of great significance.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical technology, and in particular relates to a method for dynamically stabilizing the amount of slag retained in converter smelting. Background Technology

[0002] The amount of slag in the converter smelting process affects the operation. Due to significant differences in individual operating habits and judgment standards, in actual production, each shift and operator cannot accurately grasp the amount of slag in the furnace, resulting in poor overall operational stability. They rely solely on the individual abilities and experience of the operators, which is not conducive to improving the overall operation or standardizing the operating model. This leads to significant differences in operation among shifts and makes it difficult to improve the overall operational level.

[0003] Furthermore, due to the large number of variables in the operation, the same production conditions will yield different results depending on the operator, making it impossible to accurately use the secondary calculation for heat balance and material balance. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a method for dynamically stabilizing the slag retention amount in converter smelting. This method determines the initial slag amount for each heat by measuring the relationship between the converter slag amount and the slag splashing time, confirms the amount of slag added based on the hot metal conditions, calculates the increase in slag amount during the smelting process based on slag consumption, confirms the decrease in slag amount during tapping based on the splashing conditions during smelting and the slag discharge at the furnace mouth during tapping, and confirms the amount of slag discharged during the slag dumping process based on the furnace type. By adjusting the slag amount, dynamic and stable slag retention is achieved in the converter smelting process, ensuring that the slag retention amount remains constant for each heat. This facilitates lance position adjustments, improves the accuracy of converter final temperature and composition control, and is of great significance for improving steel quality and reducing smelting costs.

[0005] This invention provides a method for dynamically stabilizing the slag retention amount in converter smelting, comprising the following steps:

[0006] 1) Determine the appropriate amount of slag for a stable converter based on the furnace type and the thickness of the slag inside the furnace;

[0007] 2) Determine the amount of slag remaining in the furnace after the slag splashing time is completed;

[0008] 3) Determine the amount of lime required for smelting and the amount of slag formed based on the molten iron conditions and slag basicity;

[0009] 4) Determine the amount of slag reduction during the smelting process based on the splashing situation;

[0010] 5) Based on the volume of slag discharged from the large furnace mouth to the slag basin during the tapping process, the amount of slag reduction during the tapping process can be estimated visually.

[0011] 6) Based on the dynamic slag quantity adjustment, confirm the amount of slag reduction required in the furnace during the slag discharge process, and then calculate the furnace rocking angle to ensure that the slag quantity in the furnace meets the requirements of the next furnace smelting.

[0012] Preferably, the effective volume of the furnace is 116–118 m³. 3 The amount of metal loaded is 115–130 tons, and the volume of the molten metal is 11–19 m³. 3 ;

[0013] The mass ratio of the slag thickness inside the furnace to the stable and suitable slag amount in the converter is (0.27~0.29)m:(12.27~13.17)tons.

[0014] Preferably, in step 2), the slag splashing time is 1 min ≤ slag splashing time < 2 min, and the amount of slag in the furnace is 3 to 5 tons;

[0015] Or, the slag splashing time is 2 min ≤ 3 min, and the amount of slag in the furnace is 6 to 8 tons.

[0016] Preferably, in step 3), the silicon content in the molten iron is 0.20–0.50%, and the slag basicity is 2.8–3.2;

[0017] The amount of lime added = silicon content of molten iron * metal content * 2.14 * alkalinity;

[0018] The amount of slag formed is calculated based on the CaO content of 45-50 wt% in the slag.

[0019] Preferably, in step 4), the spraying is a large spray, with a slag loss of 2.95 to 3.05 tons per spray.

[0020] The spraying method is medium-sized, and the slag loss per spray is 0.95 to 1.05 tons;

[0021] The splashing is small-scale, with a slag loss of 0.49 to 0.51 tons per spray.

[0022] Preferably, in step 5), the effective volume of the slag basin is 10m³. 3 .

[0023] Preferably, in step 6), when the amount of slag in the furnace is 10 to 15 tons, the amount of slag poured out is 2.45 to 2.55 tons for every 1° downward tilt of the furnace.

[0024] When the slag content in the furnace is 16 to 20 tons, the amount of slag discharged is 2.95 to 3.05 tons for every 1° downward tilt of the furnace.

[0025] This invention provides a method for dynamically stabilizing the slag amount in converter smelting, comprising: 1) determining the appropriate slag amount for the converter based on the furnace type and slag thickness; 2) confirming the slag amount for a normal slag-retaining furnace run based on the slag splashing time; 3) calculating the slag-forming amount during the smelting process based on slag consumption and molten iron conditions; 4) estimating the splashed slag amount based on the splashing conditions during the converter smelting process; 5) estimating the slag amount at the large furnace opening based on the slag basin conditions; 6) confirming the slag-pouring amount based on the furnace tilting angle; and 7) calculating the slag amount inside the furnace based on the slag amount retained in the furnace, the slag-forming amount, the splashed slag amount, the slag-pouring amount at the large furnace opening, and the slag-pouring amount. This invention ensures stable smelting by maintaining a constant slag amount within the converter. Based on the measured relationship between converter slag amount and slag splashing time, the initial slag amount for each heat is determined. The amount of slag added is confirmed by the hot metal condition. The increase in slag amount during smelting is calculated based on slag consumption. The decrease in slag amount during tapping is confirmed based on splashing during smelting and slag discharge at the furnace opening during tapping. The amount of slag removed during the slag removal process is determined based on the furnace type. By adjusting the slag amount, dynamic and stable slag retention is achieved in the converter smelting process, ensuring a constant slag amount for each heat. This facilitates lance position adjustments, reduces converter splashing, and improves the accuracy of converter final temperature and composition control, which is significant for improving steel quality and reducing smelting costs. Attached Figure Description

[0026] Figure 1 A flowchart for stable slag retention control;

[0027] Figure 2 This is a schematic diagram of the slag volume inside the converter, where 1 represents molten steel, 2 represents slag, and 3 represents slag thickness. Detailed Implementation

[0028] This invention provides a method for dynamically stabilizing the slag retention amount in converter smelting, comprising the following steps:

[0029] 1) Determine the appropriate amount of slag for a stable converter based on the furnace type and the thickness of the slag inside the furnace;

[0030] 2) Determine the amount of slag remaining in the furnace after the slag splashing time is completed;

[0031] 3) Determine the amount of lime required for smelting and the amount of slag formed based on the molten iron conditions and slag basicity;

[0032] 4) Determine the amount of slag reduction during the smelting process based on the splashing situation;

[0033] 5) Based on the volume of slag discharged from the large furnace mouth to the slag basin during the tapping process, the amount of slag reduction during the tapping process can be estimated visually.

[0034] 6) Based on the dynamic slag quantity adjustment, confirm the amount of slag reduction required in the furnace during the slag discharge process, and then calculate the furnace rocking angle to ensure that the slag quantity in the furnace meets the requirements of the next furnace smelting.

[0035] In this invention, the slag amount (A) in the furnace is equal to the amount of slag left in the furnace, the amount of slag material used for slag production, the amount of slag splashed, the amount of slag discharged from the large furnace opening, and the amount of slag dumped during furnace tilting.

[0036] In this specific embodiment, the invention employs a 120-ton converter furnace with an effective volume of 116–118 m³. 3 The furnace body has a cross-sectional area of ​​17.5–18.5 m². 2 The metal loading volume is 115–130 tons, and the volume of the molten metal is 11–19 m³. 3 To ensure that the slag expands 20 times its original size to a volume that is as large as possible but not larger than the remaining effective volume in the furnace after removing the volume occupied by the molten metal (98.16–105.33 m³). 3 That is, before expansion, the slag occupied 4.91–5.27 m³ of the furnace volume. 3 The appropriate thickness inside the furnace is 0.27–0.29 m, based on a slag density of 2.0–3.0 t / m³. 3 The optimal slag quantity for a stable converter was determined to be 12.27–13.17 tons.

[0037] In step 1) of this invention, the amount of slag to be retained must be determined: a small amount of slag is not conducive to slag formation during smelting operations. It is required to increase the amount of slag to be retained as much as possible during the smelting process. However, an excessive amount of slag can easily cause abnormal furnace conditions such as splashing, which is not conducive to production. It is necessary to determine the appropriate amount of slag to be retained based on the furnace type and the reasonable thickness of the slag in the furnace. This is conducive to smelting, that is, when the slag expands 20 times during the smelting process, the volume should not be greater than the effective volume outside the molten metal. This will satisfy the requirement that the amount of slag to be retained is large enough, and that there is no or little splashing during the smelting process. At this time, the amount of slag to be retained is the stable and appropriate amount of slag for the converter.

[0038] This invention determines the amount of slag remaining in the furnace after the slag splashing time is completed. In this invention, if 1 min ≤ slag splashing time < 2 min, the amount of slag in the furnace is 3–5 tons; or if 2 min ≤ slag splashing time ≤ 3 min, the amount of slag in the furnace is 6–8 tons. When the final slag viscosity is relatively thin, the upper limit of the slag amount is used; when the final slag viscosity is relatively thick, the lower limit of the slag amount is used.

[0039] In step 2) of this invention, the slag splashing time is required to be 1-3 minutes. The relationship between the converter slag splashing time and the amount of slag in the converter is determined by confirming the initial amount of slag remaining in the furnace after the furnace loading operation. Based on production practice, a certain linear relationship exists between the converter slag splashing time and the amount of slag in the converter; a longer splashing time indicates a larger amount of slag in the converter.

[0040] This invention determines the amount of lime required for smelting and the amount of slag formed based on the conditions of molten iron and the basicity of the slag. Before smelting, the amount of slag is calculated based on the above conditions. In this invention, the silicon content of the molten iron is 0.20–0.50%, and the basicity of the slag is 2.8–3.2; the amount of lime added = silicon content of molten iron * metal content * 2.14 * basicity; the amount of slag formed is calculated based on the CaO content of 45–50 wt% in the slag, thus determining the amount of slag to be added and the amount of slag formed during the smelting process. The mass percentages of each component in the converter slag are shown in Table 1.

[0041] Table 1. Mass percentage of each component in converter slag

[0042] Percentage / % 45～50 14～18 6-12 15-25

[0043] The slag basicity of this invention needs to be determined based on the amount of slag left and the requirements of the steel grade being smelted. Generally, the slag basicity is controlled at 2.8 to 3.2. The slag basicity must first meet the requirements of the steel grade smelting. Then, the basicity is controlled at the lower limit if the amount of slag left is large and at the upper limit if the amount of slag left is small. This determines the amount of slag material to be added during the smelting process and the amount of slag formed by the slag material, i.e., the increase in slag volume during the smelting process.

[0044] This invention determines the slag reduction during the smelting process based on the slag splashing behavior. A splashing duration of 1.5 to 3 minutes is considered a large splash, resulting in a slag loss of 2.95 to 3.05 tons per splash; a splashing duration of 40 to 90 seconds is considered a medium splash, resulting in a slag loss of 0.95 to 1.05 tons per splash; and a splashing duration of 10 to 40 seconds is considered a small splash, resulting in a slag loss of 0.49 to 0.51 tons per splash.

[0045] This invention is based on the volume of slag discharged from the large furnace opening into the slag basin during the steelmaking process, with a slag density of 2.0–3.0 t / m³. 3 The reduction in slag during the steelmaking process was estimated visually. The effective volume of the slag basin used in this invention is 10 m³. 3 .

[0046] This invention adjusts the slag volume dynamically to determine the required reduction in slag volume during the slag removal process, and then calculates the furnace tilting angle to ensure that the slag volume meets the requirements for the next smelting batch. When the slag volume in the furnace is 10-15 tons, each 1° downward tilting of the furnace results in the removal of 2.45-2.55 tons of slag; when the slag volume is 16-20 tons, each 1° downward tilting of the furnace results in the removal of 2.95-3.05 tons of slag.

[0047] The present invention has the following beneficial effects:

[0048] 1) This invention stabilizes the amount of slag in the converter by dynamically retaining slag, thus keeping the amount of slag in the converter smelting process constant.

[0049] 2) Based on the furnace type and actual operation, this invention determines the appropriate thickness of slag in the furnace, reduces the degree of splashing when the slag is severely foamed during the smelting process, optimizes the converter operation, and improves the abnormal furnace conditions caused by unstable slag retention.

[0050] 3) Before implementation, the amount of slag splashing in the converter was controlled at 10-15 kg / t steel. After implementation, the amount of slag splashing in the converter was stabilized at 5-7 kg / t steel, which is a significant effect.

[0051] To further illustrate the present invention, the following detailed description of a method for dynamically stabilizing the slag retention amount in converter smelting, in conjunction with embodiments, is provided by the present invention, but these descriptions should not be construed as limiting the scope of protection of the present invention.

[0052] Example 1: Stabilization and Slag Retention Control of a 120-ton Oxygen Top and Bottom Combined Blowing Converter

[0053] A method for dynamically stabilizing the amount of slag in a converter smelting process, the method comprising the following steps:

[0054] 1) The amount of slag inside the converter is determined based on the thickness of the slag inside the furnace, and the converter volume ratio is designed to be 1.0 m³ / h based on the furnace type. 3 / t steel, effective furnace volume 117m³ 3 The metal loading volume is 117t, and the metal density is 6.9t / m³. 3 The liquid metal occupies a volume of 16.96 m³. 3 The remaining effective space volume is 100.04 m³. 3 The slag can expand to about 20 times its normal volume through foaming in the converter, and the slag volume in the furnace should be controlled to be 5.00 m³. 3 Based on the slag density of 2.5 t / m³ 3 Based on the calculations, the amount of stabilized slag inside the furnace is approximately 12.50 tons, and the cross-sectional area of ​​the furnace body is 18 m². 2 Therefore, the thickness of the slag inside the furnace is 0.28m;

[0055] 2) The amount of slag left in the furnace is determined to be 3t based on the slag splashing time;

[0056] 3) The silicon content of the molten iron in this furnace is 0.20%, and the slag basicity needs to be maintained at 3.2. The amount of lime added is 1.6t. When the CaO content in the converter slag is 50%, the amount of slag added is increased by 3.2t.

[0057] 4) The slag volume in the furnace was 3.2 + 3 = 6.2 t. No splashing occurred from the start to the end of the blowing process, and the tapping process was stable without any slag falling from the furnace mouth.

[0058] 5) Based on the condition of the molten iron in the furnace, it is calculated that adding 3t of lime will increase the slag volume by 6t. Since the slag volume in this furnace does not need to be dumped, it will all be left in the furnace. Therefore, the slag volume in the furnace during the smelting process is 6 + 6.2 = 12.2t, which does not exceed the stable slag volume.

[0059] 6) Repeat steps 2)-5) above to perform the next batch of stable slag retention operation.

[0060] Example 2: Stabilization and Slag Retention Control of a 120-ton Oxygen Top and Bottom Combined Blowing Converter

[0061] A method for dynamically stabilizing the amount of slag in a converter smelting process, the method comprising the following steps:

[0062] 1) The amount of slag inside the converter is determined based on the thickness of the slag inside the furnace, and the converter volume ratio is designed to be 0.95m³ based on the furnace type. 3 / t steel, effective furnace volume 117m³ 3 The metal loading volume is 123t, and the metal density is 6.9t / m³. 3 The liquid metal occupies a volume of 17.83 m³. 3 The remaining effective space volume is 99.17m³. 3 The slag can expand to about 20 times its normal volume through foaming in the converter, and the slag volume in the furnace should be controlled to be 4.96 m³. 3 Based on the slag density of 2.5 t / m³ 3 Based on the calculations, the amount of stabilized slag inside the furnace is approximately 12.4 tons, and the cross-sectional area of ​​the furnace body is 18 m². 2 Therefore, the thickness of the slag inside the furnace is 0.28m;

[0063] 2) The amount of slag left in the furnace is determined to be 8t based on the slag splashing time;

[0064] 3) The silicon content of the molten iron in this furnace is 0.30%, and the slag basicity needs to be maintained at 2.8. The amount of lime added is 2.21t. When the CaO content in the converter slag is 45%, the amount of slag added is 4.91t.

[0065] 4) The slag volume in the furnace was 4.91 + 8 = 12.91t. There was one small spray from the beginning to the end of the blowing process, with a slag volume of 0.5t sprayed out. The tapping process was stable and no slag was discharged from the furnace mouth.

[0066] 5) Based on the condition of the molten iron in the furnace, it is calculated that adding 3t of lime can increase the slag volume by 6t. When the furnace is tilted and the slag is dumped, 6t of slag needs to be dumped. The initial slag discharge angle of the furnace is 106°. For every 1° of downward tilting of the furnace, 3t of slag is dumped. The furnace is tilted to 108° and then lifted.

[0067] 6) Repeat steps 2) to 5) above to perform the next batch of stable slag retention operation.

[0068] Example 3: Stabilization and Slag Retention Control of a 120-ton Oxygen Top and Bottom Combined Blowing Converter

[0069] A method for dynamically stabilizing the amount of slag in a converter smelting process, the method comprising the following steps:

[0070] 1) The amount of slag inside the converter is determined based on the thickness of the slag inside the furnace, and the converter volume ratio is designed to be 0.90m³ based on the furnace type. 3 / t steel, effective furnace volume 117m³ 3 The metal loading volume is 130t, and the metal density is 6.9t / m³. 3 The liquid metal occupies a volume of 18.84 m³. 3 The remaining effective space volume is 98.16 m³. 3 The slag can expand to about 20 times its normal volume through foaming in the converter, and the slag volume in the furnace should be controlled to be 4.91 m³. 3 Based on the slag density of 2.5 t / m³ 3 Based on calculations, the amount of stabilized slag inside the furnace is approximately 12.27 tons, and the furnace cross-sectional area is 18 m². 2 Therefore, the thickness of the slag inside the furnace is 0.27m;

[0071] 2) The amount of slag left in the furnace is determined to be 5t based on the slag splashing time;

[0072] 3) The silicon content of the molten iron in this furnace is 0.40%, and the slag basicity needs to be maintained at 3.2. The amount of lime added is 3.6t. When the CaO content in the converter slag is 48%, the amount of slag added is increased by 7.5t.

[0073] 4) The slag volume in the furnace was 7.5 + 5 = 12.5 t. No splashing occurred from the start to the end of the blowing process, and the tapping process was stable without any slag falling from the furnace mouth.

[0074] 5) Based on the condition of the molten iron in the furnace, it is calculated that adding 3t of lime can increase the slag volume by 6t. When the furnace is tilted and the slag is dumped, 6t of slag needs to be dumped. The initial slag discharge angle of the furnace is 106°. For every 1° of downward tilting of the furnace, 3t of slag is dumped. The furnace is tilted to 108° and then lifted.

[0075] 6) Repeat steps 2) to 5) above to perform the next batch of stable slag retention operation.

[0076] Comparative Example 1: Stabilization and Slag Retention Control of a 120-ton Oxygen Top and Bottom Combined Blowing Converter

[0077] 1) The amount of stabilized slag in the furnace is approximately 12.27 tons, and the cross-sectional area of ​​the furnace body is 18 m². 2 Therefore, the thickness of the slag inside the furnace is 0.27m;

[0078] 2) The amount of slag left in the furnace is determined to be 8t based on the slag splashing time.

[0079] 3) The silicon content of the molten iron in this furnace is 0.50%, requiring a slag basicity of 3.0. This necessitates the addition of 4.6 tons of lime, increasing the slag volume by 9.4 tons.

[0080] 4) The amount of slag in the furnace during the smelting process is 8 + 9.4 = 17.4t. During the process, a large spraying will result in a slag loss of 3t, a medium spraying will result in a slag loss of 1t, and a small spraying will result in a slag loss of 0.5t. During the tapping process, 2t of slag will be discharged from the furnace mouth to the slag basin.

[0081] 5) At this time, the slag in the furnace is 10.9t, the silicon content of the molten iron is 0.40%, the amount of lime added is 3.7t, and the amount of slag added is 7.5t. When the furnace is tilted and the slag is dumped, 10.9 + 7.5 - 12.27 = 6.13t of slag needs to be dumped. When the furnace is tilted and the slag is dumped, the slag is dumped at 103°. For every 1° of tilting the furnace downwards, 3t of slag is dumped. The furnace is tilted to 105° and then lifted.

[0082] The splashing and slag discharge conditions of Examples 1-3 were compared with those of Comparative Example 1, and the results are shown in Table 2:

[0083] Table 2 Comparison of splashing and slag discharge at the furnace mouth

[0084] Example 1 0t 0t Example 2 0.5t 0t Example 3 0t 0t Comparative Example 1 6.5t 2t

[0085] Table 2 shows that the smaller the amount of splashed slag, the fewer abnormal emissions during the smelting process. Splashing can cause environmental pollution, high-temperature damage, and equipment damage, so the less splashing during the smelting process, the better. The slag feeding process at the large furnace opening accompanies the steel tapping process, which affects the operator's judgment of the steel tapping endpoint and may also cause accidents such as burning out the ladle car cables. Therefore, slag feeding at the large furnace opening should be avoided.

[0086] As can be seen from the above embodiments, the present invention provides a method for dynamically stabilizing the slag amount in converter smelting, including: 1) determining the appropriate slag amount for the converter based on the furnace type and slag thickness; 2) confirming the slag amount for a normal slag-retaining furnace run based on the slag splashing time; 3) calculating the slag-forming amount during the smelting process based on slag consumption and molten iron conditions; 4) estimating the splashed slag amount based on the splashing conditions during the converter smelting process; 5) estimating the slag amount at the large furnace opening based on the slag basin conditions; 6) confirming the slag-pouring amount based on the furnace tilting angle; 7) calculating the slag amount inside the furnace based on the slag amount retained in the furnace, the slag-forming amount, the splashed slag amount, the slag-pouring amount at the large furnace opening, and the slag-pouring amount. This invention ensures stable smelting by maintaining a constant slag amount within the converter. Based on the measured relationship between converter slag amount and slag splashing time, the initial slag amount for each heat is determined. The amount of slag added is confirmed by the hot metal condition. The increase in slag amount during smelting is calculated based on slag consumption. The decrease in slag amount during tapping is confirmed based on splashing during smelting and slag discharge at the furnace opening during tapping. The amount of slag removed during the slag removal process is determined based on the furnace type. By adjusting the slag amount, dynamic and stable slag retention is achieved in the converter smelting process, ensuring a constant slag amount for each heat. This facilitates lance position adjustments, reduces converter splashing, and improves the accuracy of converter final temperature and composition control, which is significant for improving steel quality and reducing smelting costs.

[0087] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for dynamically stabilizing the slag retention amount in converter smelting, comprising the following steps: 1) Determine the appropriate amount of slag for a stable converter based on the furnace type and the thickness of the slag inside the furnace; 2) Determine the amount of slag remaining in the furnace after the slag splashing time is completed; if 1 min ≤ slag splashing time < 2 min, the amount of slag in the furnace is 3 to 5 tons; or if 2 min ≤ slag splashing time ≤ 3 min, the amount of slag in the furnace is 6 to 8 tons. 3) Determine the amount of lime required for smelting and the amount of slag formed based on the molten iron conditions and slag basicity; the silicon content in the molten iron is 0.20~0.50%, and the slag basicity is 2.8~3.2; the amount of lime added = silicon content in molten iron * metal content * 2.14 * basicity; the amount of slag formed is calculated based on the CaO content in the slag of 45~50wt%; 4) Determine the amount of slag reduction during the smelting process based on the splashing situation; large splashing results in a slag loss of 2.95~3.05 tons per splash; medium splashing results in a slag loss of 0.95~1.05 tons per splash; small splashing results in a slag loss of 0.49~0.51 tons per splash; 5) Based on the volume of slag discharged from the large furnace opening to the slag basin during the tapping process, the amount of slag reduction during the tapping process can be estimated visually. 6) Based on the dynamic slag quantity adjustment, confirm the amount of slag reduction required in the furnace during the slag discharge process of this furnace, and then calculate the furnace rocking angle to ensure that the amount of slag in the furnace meets the requirements of the next furnace smelting. When the slag in the furnace is 10-15 tons, for every 1° the furnace is tilted downwards, 2.45-2.55 tons of slag are poured out. When the slag content in the furnace is 16 to 20 tons, the amount of slag discharged is 2.95 to 3.05 tons for every 1° downward tilt of the furnace.

2. The method according to claim 1, characterized in that, The effective volume of the furnace is 116~118m³. 3 The amount of metal loaded is 115-130 tons, and the volume of the molten metal is 11-19 m³. 3 ; The mass ratio of the slag thickness inside the furnace to the stable and suitable slag amount in the converter is (0.27~0.29) m:(12.27~13.17) tons.

3. The method according to claim 1, characterized in that, In step 5), the effective volume of the slag pot is 10m³. 3 .

Images