Method for stabilizing converter smelting slag remaining amount through dynamic slag remaining

Abstract

The invention provides a method for dynamically stabilizing the smelting slag remaining amount of a converter through slag remaining. According to the method, the stability of the smelting process is ensured by keeping the slag amount in the converter constant, the initial slag amount of the slag remaining furnace is determined according to the relation between the actually measured converter slag amount and the slag splashing time, the adding amount of the slag amount is determined according to the molten iron condition, and the increment of the slag amount in the smelting process is calculated according to the slag amount consumption; and according to the splashing condition in the smelting process and the large-furnace-opening slag discharging condition in the tapping process, the reduction of the slag amount in the smelting and tapping process is determined, and the slag amount poured out in the shaking furnace slag pouring process is determined according to the furnace profile condition. According to increase and decrease of the slag amount, dynamic and stable slag remaining operation in the converter smelting process is achieved, it is guaranteed that the slag remaining amount in each converter smelting process is in a constant state, gun position operation adjustment is facilitated, the converter splashing amount is reduced, the converter final temperature and component control precision are improved, and great significance is achieved for improving the molten steel quality and reducing the smelting cost.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for dynamically retaining slag to stabilize the amount of slag retained in converter smelting. Background Art

[0002] The amount of slag in the converter smelting process affects the operation process. Due to the large differences in personal operating habits and judgment standards, in actual production, each team and operator cannot accurately grasp the amount of slag in the furnace, and the overall operation stability is poor. It only relies on the personal ability and experience of the operator. This is not conducive to the improvement of the overall operation, nor to the unification of the operation model, resulting in large differences in the operations of each team and it is difficult to improve the overall operation level.

[0003] In addition, due to the large number of variables in the operation, the same production conditions will produce different results when different operators are used, and the secondary calculation of heat balance and material balance cannot be used accurately. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a method for dynamically retaining slag and stabilizing the amount of slag retained in converter smelting, the method determines the initial slag amount of the slag retention furnace by measuring the relationship between the converter slag amount and the slag splashing time, confirms the amount of slag added by the molten iron situation, calculates the increment of slag amount in the smelting process according to the slag consumption, confirms the reduction of slag amount in the smelting and tapping process according to the splashing situation in the smelting process and the slag situation at the large furnace mouth in the tapping process, and confirms the amount of slag poured out in the slag shaking process according to the furnace type. According to the increase and decrease of the slag amount, the dynamic and stable slag retention operation of the converter smelting process is realized, the slag amount of each furnace smelting process is guaranteed to be in a constant state, the gun position operation adjustment is convenient, and the converter terminal temperature and composition control accuracy are improved, which is of great significance to improving the quality of molten steel and reducing smelting costs.

[0005] The present invention provides a method for dynamically retaining slag to stabilize the amount of slag retained in converter smelting, comprising the following steps:

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

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

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

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

[0010] 5) According to the volume of slag from the furnace mouth to the slag basin during the steel-tapping process, the amount of slag reduction during the steel-tapping process can be visually estimated;

[0011] 6) According to the dynamic slag amount adjustment, confirm the amount of slag reduction in the furnace required for the slag discharge process of this furnace, and calculate the furnace shaking angle to ensure that the slag amount in the furnace meets the requirements of the next furnace smelting.

[0012] Preferably, the effective volume of the furnace is 116-118m 3 ; The metal loading is 115-130 tons, and the volume of the molten metal is 11-19m 3 ;

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

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

[0015] Or the slag splashing time is 2min≤≤3min, 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 by the slag material is calculated based on the CaO content of 45 to 50 wt % in the slag.

[0019] Preferably, in step 4), the splashing is large, and the slag loss is 2.95-3.05 tons per time;

[0020] The splashing is medium spraying, and the amount of slag lost at one time is 0.95 to 1.05 tons;

[0021] The splashing is small, and the amount of slag lost at one time is 0.49 to 0.51 tons.

[0022] Preferably, in step 5), the effective volume of the slag basin is 10m 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 shaking of the furnace;

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

[0025] The present invention provides a method for dynamically retaining slag and stabilizing the amount of slag retained in converter smelting, comprising: 1) determining a suitable amount of slag for the converter according to the furnace type and slag thickness; 2) confirming the amount of slag retained in the furnace for a normal slag retention furnace according to the slag splashing time; 3) calculating the amount of slag made by slag material in the smelting process according to the slag consumption and the molten iron conditions; 4) estimating the amount of splashing slag according to the splashing conditions in the converter smelting process; 5) estimating the amount of slag under the large furnace mouth according to the slag basin conditions; 6) confirming the amount of slag poured according to the furnace pouring angle; 7) calculating the amount of slag in the furnace according to the amount of slag retained in the furnace, the amount of slag made by slag material, the amount of splashing slag, the amount of slag under the large furnace mouth, and the amount of slag poured. The present invention ensures the stability of the smelting process by ensuring that the amount of slag in the converter remains constant. According to the measured relationship between the converter slag amount and the slag splashing time, the initial slag amount of the slag-retaining furnace is determined, the amount of slag added is confirmed by the molten iron situation, the increment of the slag amount in the smelting process is calculated according to the slag consumption, the reduction of the slag amount in the smelting and tapping process is confirmed according to the splashing situation in the smelting process and the slag under the large furnace mouth in the tapping process, and the amount of slag poured out during the slag-dumping process is confirmed according to the furnace type. According to the increase and decrease of the slag amount, the dynamic and stable slag-retaining operation of the converter smelting process is realized, the slag amount of each furnace smelting process is guaranteed to be in a constant state, the gun position operation adjustment is convenient, the converter splashing amount is reduced, and the converter terminal temperature and composition control accuracy are improved, which is of great significance to improving the quality of molten steel and reducing smelting costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 To stabilize the slag control flow chart;

[0027] Figure 2 It is a schematic diagram of the slag amount in the converter, where 1 is molten steel, 2 is slag, and 3 is slag thickness. DETAILED DESCRIPTION

[0028] The present invention provides a method for dynamically retaining slag to stabilize the amount of slag retained in converter smelting, comprising the following steps:

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

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

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

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

[0033] 5) According to the volume of slag from the furnace mouth to the slag basin during the steel-tapping process, the amount of slag reduction during the steel-tapping process can be visually estimated;

[0034] 6) According to the dynamic slag amount adjustment, confirm the amount of slag reduction in the furnace required for the slag discharge process of this furnace, and then calculate the furnace shaking angle to ensure that the slag amount in the furnace meets the requirements of the next furnace smelting.

[0035] In the present invention, the amount of slag in the furnace (A) = the amount of slag left in the upper furnace + the amount of slag made by slag material - the amount of splashing slag - the amount of slag under the large furnace mouth - the amount of slag discharged from the furnace.

[0036] The present invention adopts a 120-ton converter furnace in a specific embodiment, and the effective volume of the furnace is 116-118m 3 ; The cross-sectional area of ​​the furnace is 17.5~18.5m 2 The metal loading is 115-130 tons, and the volume of the molten metal is 11-19m 3 , ensure that the volume of the slag after expansion 20 times is as large as possible and not larger than the remaining effective volume (98.16~105.33m 3 ), that is, the volume of the furnace before expansion is 4.91 to 5.27 m 3 The appropriate thickness in the furnace is 0.27-0.29m, according to the slag density of 2.0-3.0t / m 3 , it is determined that the appropriate slag amount for converter stability is 12.27 to 13.17 tons.

[0037] In step 1) of the present invention, the amount of slag required to be retained is determined: a small amount of slag retained during the smelting operation is not conducive to slagging, and the amount of slag retained is required to be increased as much as possible during the smelting process. However, an excessive amount of slag retained is prone to splashing and other abnormal furnace conditions, which is not conducive to production. It is necessary to have a reasonable thickness of slag in the furnace based on the furnace type and the slag in the furnace, which is conducive to smelting, that is, when the slag volume expands 20 times during the smelting process, the volume is not greater than the effective volume outside the molten metal, which satisfies the requirement that the slag volume is large enough, and the smelting process does not splash or splashes less. At this time, the slag amount is a stable and suitable slag amount for the converter.

[0038] The present invention determines the amount of slag remaining in the furnace after the furnace loading operation is completed according to the slag splashing time. In the present invention, 1min≤slag splashing time<2min, the amount of slag in the furnace is 3-5 tons; or 2min≤slag splashing time≤3min, the amount of slag in the furnace is 6-8 tons. When the viscosity of the final slag is thin, the slag amount takes the upper limit value, and when the viscosity of the key slag is sticky, the slag amount takes the lower limit value.

[0039] In step 2) of the present invention, the slag splashing time is required to be 1 to 3 minutes. The relationship between the converter slag splashing time and the amount of slag in the converter is to confirm the initial amount of slag left in the furnace after the furnace loading operation is completed. According to production practice, there is a certain amount of linear relationship between the converter slag splashing time and the converter slag splashing time. The longer the slag splashing time, the greater the amount of slag in the converter.

[0040] The present invention determines the amount of lime required to be added during smelting and the amount of slag formed according to the conditions of the molten iron and the basicity of the slag. The present invention first calculates the amount of slag according to the above conditions before smelting. In the present 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 the molten iron * metal amount * 2.14 * basicity; the amount of slag formed by the slag is calculated based on the CaO content of 45-50wt% in the slag to determine the amount of slag required to be added during smelting in this furnace and the amount of slag formed by the slag. The mass proportions of each component of the converter slag are shown in Table 1:

[0041] Table 1 The mass proportion of each component of converter slag

[0042] Element CaO <![CDATA[SiO2]]> MgO FeO Proportion / % 45～50 14～18 6-12 15-25

[0043] The slag basicity of the present invention needs to be determined based on the amount of slag left and the requirements for the type of steel to be smelted. Generally, the slag basicity is controlled to be 2.8-3.2. The slag basicity needs to first meet the requirements for steel smelting, and then the basicity is controlled to take a lower limit when the amount of slag left is large, and the basicity is controlled to take an upper limit when the amount of slag left is small. The slag material that needs to be added during smelting of this furnace and the amount of slag formed by the slag material, that is, the increase in slag during the smelting process, is determined.

[0044] The present invention determines the amount of slag reduction in the smelting process according to the slag splashing situation in the smelting process. When the splashing duration reaches 1.5min to 3min, it is a large splashing, and the slag loss is 2.95 to 3.05 tons at one time; when the splashing duration reaches 40s to 90s, it is a medium splashing, and the slag loss is 0.95 to 1.05 tons at one time; when the splashing duration reaches 10s to 40s, it is a small splashing, and the slag loss is 0.49 to 0.51 tons at one time.

[0045] The present invention is based on the volume of slag from the large furnace mouth to the slag basin during the steel tapping process, and the slag density is 2.0-3.0t / m 3 , visually estimate the amount of slag reduction during the steel-making process. The effective volume of the slag basin used in the present invention is 10m 3 .

[0046] The present invention adjusts the amount of slag in the furnace according to the dynamic slag amount, confirms the amount of slag reduction required for the slag discharge process of the furnace, and then calculates the furnace shaking angle to ensure that the slag in the furnace meets the requirements of the next furnace smelting. When the amount of slag in the furnace of the present invention is 10 to 15 tons, the amount of slag discharged is 2.45 to 2.55 tons for each downward shaking of the furnace by 1°; when the amount of slag in the furnace is 16 to 20 tons, the amount of slag discharged is 2.95 to 3.05 tons for each downward shaking of the furnace by 1°.

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

[0048] 1) The present invention stabilizes the slag amount in the converter by dynamically retaining slag, so that the slag amount in the converter smelting process is always kept constant.

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

[0050] 3) Before the implementation of the present invention, the amount of converter slag splashing is controlled at 10-15 kg / t steel. After the implementation, the statistical amount of converter slag splashing is stabilized at 5-7 kg / t steel, with significant effect.

[0051] In order to further illustrate the present invention, a method for dynamically retaining slag to stabilize the amount of slag retained in converter smelting provided by the present invention is described in detail below in conjunction with embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0052] Example 1 Stable slag control of a 120-ton oxygen top and bottom combined blowing converter

[0053] A method for dynamically retaining slag to stabilize the amount of converter smelting slag, the method comprising the following steps:

[0054] 1) The amount of slag in the converter is determined based on the thickness of the slag in the furnace, and the converter capacity ratio is designed according to the furnace type. 3 / t steel, effective volume of furnace 117m 3 , metal loading 117t, metal density 6.9t / m 3 , the liquid metal occupies a volume of 16.96m 3 , the remaining effective space volume is 100.04m 3 The slag foaming volume in the converter can expand to about 20 times the normal volume, and the slag volume in the furnace is controlled to occupy 5.00m 3 , according to the slag density of 2.5t / m 3 Calculation shows that the amount of stable slag in the furnace is about 12.50t, and the cross-sectional area of ​​the furnace is 18m 2 , then the thickness of the slag in the furnace is 0.28m;

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

[0056] 3) The silicon content of the hot metal in this furnace is 0.20%, and the slag basicity needs to be ensured to be 3.2. 1.6 tons of lime are added. When the CaO content in the converter slag is 50%, the slag amount is increased by 3.2 tons;

[0057] 4) The amount of slag in the furnace was 3.2+3=6.2t, no splashing occurred from the beginning to the end of blowing, and the steel tapping process was stable without slag falling from the furnace mouth;

[0058] 5) According to the situation of molten iron in the furnace, it is calculated that adding 3t of lime can increase the slag volume by 6t. The slag in this furnace does not need to be dumped and can all be retained in the furnace. Therefore, the slag volume in the furnace during the smelting process of the furnace is 6+6.2=12.2t, which does not exceed the stable slag volume.

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

[0060] Example 2 Stable slag control of a 120-ton oxygen top and bottom combined blowing converter

[0061] A method for dynamically retaining slag to stabilize the amount of converter smelting slag, the method comprising the following steps:

[0062] 1) The amount of slag in the converter is determined based on the thickness of the slag in the furnace, and the converter capacity ratio is designed to be 0.95m according to the furnace type. 3 / t steel, effective volume of furnace 117m 3 , metal loading 123t, metal density 6.9t / m 3 , the liquid metal occupies a volume of 17.83m 3 , the remaining effective space volume is 99.17m 3 The slag foaming volume in the converter can expand to about 20 times the normal volume, and the slag volume in the furnace is controlled to occupy 4.96m 3 , according to the slag density of 2.5t / m 3 Calculation shows that the amount of stable slag in the furnace is about 12.4t, and the cross-sectional area of ​​the furnace is 18m 2 , then the thickness of the slag in the furnace is 0.28m;

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

[0064] 3) The silicon content of the hot metal in this furnace is 0.30%, so the slag basicity needs to be 2.8, and 2.21 tons of lime need to be added. When the CaO content in the converter slag is 45%, the amount of slag needs to be increased by 4.91 tons;

[0065] 4) The amount of slag in the furnace was 4.91+8=12.91t. A small blowout occurred from the beginning to the end of blowing, with a slag amount of 0.5t. The steel-making process was stable and no slag fell from the furnace mouth.

[0066] 5) According to the situation of molten iron in the furnace, it is calculated that adding 3t of lime can increase the slag volume by 6t. When this furnace is unloaded and slag is discharged, 6t of slag needs to be discharged. The initial slag discharge angle of this furnace is 106°. Every time the furnace is shaken downward by 1°, 3t of slag is discharged. This furnace is lifted when it is shaken to 108°.

[0067] 6) Repeat the above steps 2) to 5) to carry out the stable slag retention operation for the next heat.

[0068] Example 3 Stable slag control of a 120-ton oxygen top and bottom combined blowing converter

[0069] A method for dynamically retaining slag to stabilize the amount of converter smelting slag, the method comprising the following steps:

[0070] 1) The amount of slag in the converter is determined based on the thickness of the slag in the furnace, and the converter capacity ratio is designed to be 0.90m according to the furnace type. 3 / t steel, effective volume of furnace 117m 3 , metal loading 130t, metal density 6.9t / m 3 , the liquid metal occupies a volume of 18.84m 3 , the remaining effective space volume is 98.16m 3 The slag foaming volume in the converter can expand to about 20 times the normal volume, and the slag volume in the furnace is controlled to occupy 4.91m 3 , according to the slag density of 2.5t / m 3 Calculation shows that the amount of stable slag in the furnace is about 12.27t, and the cross-sectional area of ​​the furnace is 18m 2 , then the thickness of the slag in the furnace is 0.27m;

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

[0072] 3) The silicon content of the hot metal in this furnace is 0.40%, so the slag basicity needs to be 3.2, and 3.6 tons of lime should be added. When the CaO content in the converter slag is 48%, the slag volume should be increased by 7.5 tons;

[0073] 4) The amount of slag in the furnace was 7.5+5=12.5t, no splashing occurred from the beginning to the end of blowing, and the steel tapping process was stable without slag falling from the furnace mouth;

[0074] 5) According to the situation of molten iron in the furnace, it is calculated that adding 3t of lime can increase the slag volume by 6t. When this furnace is unloaded and slag is discharged, 6t of slag needs to be discharged. The initial slag discharge angle of this furnace is 106°. Every time the furnace is shaken downward by 1°, 3t of slag is discharged. This furnace is lifted when it is shaken to 108°.

[0075] 6) Repeat the above steps 2) to 5) to carry out the stable slag retention operation for the next heat.

[0076] Comparative Example 1 Stable slag control of 120-ton oxygen top and bottom combined blowing converter

[0077] 1) The amount of stable slag in the furnace is about 12.27t, and the cross-sectional area of ​​the furnace body is 18m 2 , then the thickness of the slag in the furnace is 0.27m;

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

[0079] 3) The furnace has 0.50% silicon in hot metal, so the slag basicity needs to be 3.0, 4.6 tons of lime is added, and the slag volume is increased 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, 3t of slag is lost in one large spray, 1t of slag is lost in one medium spray, and 0.5t of slag is lost in one small spray. During the steel-making process, the amount of slag discharged from the large furnace mouth to the slag basin is 2t.

[0081] 5) At this time, the amount of slag in the furnace is 10.9t, the silicon content of the molten iron in the lower furnace is 0.40%, 3.7t of lime is added, and the amount of slag is increased by 7.5t. When this furnace is unloaded and slag is discharged, 10.9+7.5-12.27=6.13t of slag needs to be discharged. When this furnace is shaken and slag is discharged, the slag is discharged at 103°. Every time the furnace is shaken downward by 1°, 3t of slag is discharged. This furnace is shaken to 105° and the furnace is lifted.

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

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

[0084] Splashing slag amount Large furnace mouth slag amount Example 1 0t 0t Example 2 0.5t 0t Example 3 0t 0t Comparative Example 1 6.5t 2t

[0085] As can be seen from Table 2, the smaller the amount of splashing slag, the less abnormal emissions in the smelting process. Splashing may cause environmental pollution, high temperature damage, equipment damage, etc. The smelting process requires as little splashing as possible. The slag discharge process at the large furnace mouth accompanies the steel tapping process, which affects the operator's judgment of the steel tapping end point and may also cause accidents such as burning the ladle car cable. Therefore, slag discharge at the large furnace mouth should be avoided.

[0086] It can be seen from the above embodiments that the present invention provides a method for dynamically retaining slag and stabilizing the amount of slag retained in converter smelting, comprising: 1) determining the appropriate amount of slag for the converter according to the furnace type and slag thickness; 2) confirming the amount of slag retained in the normal slag retention furnace according to the slag splashing time; 3) calculating the amount of slag made by slag material in the smelting process according to the slag consumption and the molten iron conditions; 4) estimating the amount of splashing slag according to the splashing conditions in the converter smelting process; 5) estimating the amount of slag under the large furnace mouth according to the slag basin conditions; 6) confirming the amount of slag poured according to the furnace pouring angle; 7) calculating the amount of slag in the furnace according to the amount of slag retained in the furnace, the amount of slag made by slag material, the amount of splashing slag, the amount of slag under the large furnace mouth, and the amount of slag poured. The present invention ensures the stability of the smelting process by ensuring that the amount of slag in the converter remains constant. According to the measured relationship between the converter slag amount and the slag splashing time, the initial slag amount of the slag-retaining furnace is determined, the amount of slag added is confirmed by the molten iron situation, the increment of the slag amount in the smelting process is calculated according to the slag consumption, the reduction of the slag amount in the smelting and tapping process is confirmed according to the splashing situation in the smelting process and the slag under the large furnace mouth in the tapping process, and the amount of slag poured out during the slag-dumping process is confirmed according to the furnace type. According to the increase and decrease of the slag amount, the dynamic and stable slag-retaining operation of the converter smelting process is realized, the slag amount of each furnace smelting process is guaranteed to be in a constant state, the gun position operation adjustment is convenient, the converter splashing amount is reduced, and the converter terminal temperature and composition control accuracy are improved, which is of great significance to improving the quality of molten steel and reducing smelting costs.

[0087] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for dynamically stabilizing the amount of slag left in converter smelting, comprising the following steps: 1) Determine the appropriate amount of slag for converter stability based on the furnace type and the thickness of the slag in the furnace; 2) Determine the amount of slag remaining in the furnace after the furnace loading operation is completed based on the slag splashing time; 3) Determine the amount of lime required for smelting and the amount of slag formed according to the conditions of molten iron and slag basicity; 4) Determine the amount of slag reduction during the smelting process based on the splashing conditions during the smelting process; 5) According to the volume of slag from the furnace mouth to the slag basin during the steel-tapping process, the amount of slag reduction during the steel-tapping process can be visually estimated; 6) According to the dynamic slag amount adjustment, confirm the amount of slag reduction in the furnace required for the slag discharge process of this furnace, and calculate the furnace shaking angle to ensure that the slag amount in the furnace meets the requirements of the next furnace smelting.

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

3. The method according to claim 2, characterized in that In step 2), the slag splashing time is 1min≤2min, and the amount of slag in the furnace is 3-5 tons; Or the slag splashing time is 2min≤≤3min, and the amount of slag in the furnace is 6 to 8 tons.

4. The method according to claim 3, characterized in that In step 3), 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 of molten iron * metal content * 2.14 * alkalinity; The amount of slag formed by the slag material is calculated based on the CaO content of 45 to 50 wt % in the slag.

5. The method according to claim 4, characterized in that In step 4), the splashing is large, and the slag loss is 2.95-3.05 tons at a time; The splashing is medium spraying, and the amount of slag lost at one time is 0.95 to 1.05 tons; The splashing is small, and the amount of slag lost at one time is 0.49 to 0.51 tons.

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

7. The method according to claim 1, characterized in that In step 6), when the amount of slag in the furnace is 10-15 tons, the amount of slag poured out is 2.45-2.55 tons for every 1° downward shaking of the furnace; When the amount of slag in the furnace is 16 to 20 tons, the amount of slag poured out is 2.95 to 3.05 tons for every 1° downward shaking of the furnace.

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