阅读说明：本技术 一种提高转炉冶炼效率的生产方法 (Production method for improving smelting efficiency of converter ) 是由 翟冬雨 吴俊平 方磊 姜金星 杜海军 员强鹏 殷杰 刘帅 于 2020-04-13 设计创作，主要内容包括：本发明公开了一种提高转炉冶炼效率的生产方法,涉及钢铁冶炼领域,若铁水温度≥1250℃且硅含量在0.10%≤Si≤0.50%,则在铁水预处理后添加锰铁合金,使锰硅含量比达到0.8～1.0；若铁水温度＜1250℃且硅含量在0.40%≤Si≤0.50%,则在铁水预处理后添加锰铁合金,使锰硅含量比达到0.8～1.0；若铁水温度＜1250℃且硅含量在0.10%≤Si＜0.40%,则在铁水预处理后添加锰铁合金,使锰硅含量比达到1.0～1.2；通过调整铁水锰硅比,提高了转炉冶炼前期的熔池温度,提高了炉渣前期去磷的能力,促进了转炉炉渣的流动性,减少了炉渣过程返干,冶炼过程的脱磷能力得到了有效改善。(The invention discloses a production method for improving smelting efficiency of a converter, which relates to the field of steel smelting, wherein if the temperature of molten iron is more than or equal to 1250 ℃ and the silicon content is more than or equal to 0.10% and less than or equal to 0.50% of Si, ferromanganese is added after the molten iron is pretreated, so that the content ratio of manganese to silicon reaches 0.8-1.0; if the temperature of the molten iron is less than 1250 ℃ and the silicon content is more than or equal to 0.40% and less than or equal to 0.50%, adding ferromanganese alloy after the molten iron is pretreated to enable the content ratio of manganese to silicon to reach 0.8-1.0; if the temperature of the molten iron is less than 1250 ℃ and the silicon content is more than or equal to 0.10% and less than 0.40%, adding ferromanganese alloy after the molten iron is pretreated to enable the content ratio of manganese to silicon to reach 1.0-1.2; by adjusting the ratio of manganese to silicon in molten iron, the temperature of a molten pool in the early stage of smelting of the converter is increased, the phosphorus removal capability of the slag in the early stage is improved, the fluidity of the slag of the converter is promoted, the slag return dryness is reduced, and the dephosphorization capability in the smelting process is effectively improved.)

1. A production method for improving smelting efficiency of a converter is characterized by comprising the following steps: the applicable molten iron comprises the following components in percentage by weight: 4.5% -5.5%, Si: 0.10-0.50%, Mn: 0.10% -0.20%, P: 0.120% -0.150%, S: 0.020% to 0.060% with the balance being Fe and unavoidable impurities, comprising the steps of:

if the temperature of the molten iron is more than or equal to 1250 ℃ and the silicon content is more than or equal to 0.10% and less than or equal to 0.50%, adding ferromanganese alloy after the molten iron is pretreated to enable the content ratio of manganese to silicon to reach 0.8-1.0;

if the temperature of the molten iron is less than 1250 ℃ and the silicon content is more than or equal to 0.40% and less than or equal to 0.50%, adding ferromanganese alloy after the molten iron is pretreated to enable the content ratio of manganese to silicon to reach 0.8-1.0;

if the temperature of the molten iron is less than 1250 ℃ and the silicon content is more than or equal to 0.10% and less than 0.40%, adding ferromanganese alloy after the molten iron is pretreated to enable the content ratio of manganese to silicon to reach 1.0-1.2;

the converter adopts a top-bottom combined blowing mode, lime, light-burned dolomite and magnesium balls are added for slagging at one time 2min before blowing, and slagging is carried out by returning ores in the process to adjust the temperature so as to ensure stable slagging in the process;

measuring a sublance when the converter blows to 85 percent, and performing end point control according to a sublance measurement result to ensure that the content of ferric oxide and the content of manganese oxide in the final smelting slag are 15 to 20 percent and 3.0 to 3.5 percent respectively;

adjusting the flow of bottom blowing argon, and performing blowing 80% of front bottom blowing flow of 220m³Per, 80% bottom blow flow to blowing end is performed at 350m³/h；

Controlling a smelting endpoint according to the steel grade requirement, wherein the carbon content meets 0.03-0.12%, the phosphorus content meets the steel grade requirement, the tapping temperature is 1620-1680 ℃, and tapping operation is carried out after the component temperature meets the requirement.

2. The production method for improving the smelting efficiency of the converter according to claim 1, which is characterized in that: the molten iron comprises the following components in percentage by weight: 4.6%, Si: 0.40%, Mn: 0.15%, P: 0.129%, S: 0.030 percent, the balance being Fe and inevitable impurities, the temperature of the molten iron being 1220 ℃, and the method comprises the following measures:

adding ferromanganese after the pretreatment of molten iron to enable the content ratio of manganese to silicon to reach 0.9;

the converter adopts a top-bottom combined blowing mode, lime, light-burned dolomite and magnesium balls are added for slagging at one time 2min before blowing, and slagging is carried out by returning ores in the process to adjust the temperature so as to ensure stable slagging in the process;

measuring a sublance when the converter blows to 85 percent, and performing end point control according to a sublance measurement result to ensure that the content of ferric oxide and the content of manganese oxide in the final smelting slag are 15 to 20 percent and 3.0 to 3.5 percent respectively;

adjusting the flow of bottom blowing argon, and performing blowing 80% of front bottom blowing flow of 220m³Per, 80% bottom blow flow to blowing end is performed at 350m³/h；

Controlling a smelting end point according to the steel grade requirement, wherein the carbon content meets 0.03-0.12%, the phosphorus content meets the steel grade requirement, the tapping temperature is 1652 ℃, and tapping operation is carried out after the component temperature meets the requirement.

3. The production method for improving the smelting efficiency of the converter according to claim 1, which is characterized in that: the molten iron comprises the following components in percentage by weight: 4.8%, Si: 0.22%, Mn: 0.16%, P: 0.139%, S: 0.040 percent, the balance being Fe and inevitable impurities, and the temperature of molten iron is 1290 ℃;

adding a proper amount of manganese-iron alloy after the molten iron is pretreated to enable the content ratio of manganese to silicon to reach 1.0;

the converter adopts a top-bottom combined blowing mode, lime, light-burned dolomite and magnesium balls are added for slagging at one time 2min before blowing, and slagging is carried out by returning ores in the process to adjust the temperature so as to ensure stable slagging in the process;

measuring a sublance when the converter blows to 85 percent, and performing end point control according to a sublance measurement result to ensure that the content of ferric oxide and the content of manganese oxide in the final smelting slag are 15 to 20 percent and 3.0 to 3.5 percent respectively;

adjusting the flow of bottom blowing argon, and performing blowing 80% of front bottom blowing flow of 220m³Per, 80% bottom blow flow to blowing end is performed at 350m³/h；

Controlling a smelting end point according to the steel grade requirement, wherein the carbon content meets 0.03-0.12%, the phosphorus content meets the steel grade requirement, the tapping temperature is 1630 ℃, and tapping operation is carried out after the component temperature meets the requirement.

4. The production method for improving the smelting efficiency of the converter according to claim 1, which is characterized in that: the molten iron comprises the following components in percentage by weight: 4.8%, Si: 0.45%, Mn: 0.12%, P: 0.139%, S: 0.040 percent, and the balance of Fe and inevitable impurities, wherein the temperature of molten iron is 1255 ℃;

adding a proper amount of manganese-iron alloy after the molten iron is pretreated to enable the content ratio of manganese to silicon to reach 0.8;

the converter adopts a top-bottom combined blowing mode, lime, light-burned dolomite and magnesium balls are added for slagging at one time 2min before blowing, and slagging is carried out by returning ores in the process to adjust the temperature so as to ensure stable slagging in the process;

measuring a sublance when the converter blows to 85 percent, and performing end point control according to a sublance measurement result to ensure that the content of ferric oxide and the content of manganese oxide in the final smelting slag are 15 to 20 percent and 3.0 to 3.5 percent respectively;

adjusting the flow of bottom blowing argon, and performing blowing 80% of front bottom blowing flow of 220m³Per, 80% bottom blow flow to blowing end is performed at 350m³/h；

Controlling a smelting end point according to the steel grade requirement, wherein the carbon content meets 0.03-0.12%, the phosphorus content meets the steel grade requirement, the tapping temperature is 1660 ℃, and tapping operation is carried out after the component temperature meets the requirement.

5. The production method for improving the smelting efficiency of the converter according to claim 1, which is characterized in that: the molten iron comprises the following components in percentage by weight: 4.7%, Si: 0.35%, Mn: 0.18%, P: 0.139%, S: 0.055 percent and the balance of Fe and inevitable impurities, wherein the temperature of molten iron is 1310 ℃;

adding a proper amount of manganese-iron alloy after the molten iron is pretreated to enable the content ratio of manganese to silicon to reach 0.8;

the converter adopts a top-bottom combined blowing mode, lime, light-burned dolomite and magnesium balls are added for slagging at one time 2min before blowing, and slagging is carried out by returning ores in the process to adjust the temperature so as to ensure stable slagging in the process;

measuring a sublance when the converter blows to 85 percent, and performing end point control according to a sublance measurement result to ensure that the content of ferric oxide and the content of manganese oxide in the final smelting slag are 15 to 20 percent and 3.0 to 3.5 percent respectively;

adjusting the flow of bottom blowing argon, and performing blowing 80% of front bottom blowing flow of 220m³Per, 80% bottom blow flow to blowing end is performed at 350m³/h；

Controlling a smelting end point according to the steel grade requirement, wherein the carbon content meets 0.03-0.12%, the phosphorus content meets the steel grade requirement, the tapping temperature is 1650 ℃, and the tapping operation is carried out after the component temperature meets the requirement.

6. The production method for improving the smelting efficiency of the converter according to claim 1, which is characterized in that: the molten iron comprises the following components in percentage by weight: 4.9%, Si: 0.32%, Mn: 0.18%, P: 0.139%, S: 0.035%, and the balance of Fe and inevitable impurities, wherein the temperature of molten iron is 1180 ℃;

adding a proper amount of manganese-iron alloy after the molten iron is pretreated to enable the content ratio of manganese to silicon to reach 1.1;

the converter adopts a top-bottom combined blowing mode, lime, light-burned dolomite and magnesium balls are added for slagging at one time 2min before blowing, and slagging is carried out by returning ores in the process to adjust the temperature so as to ensure stable slagging in the process;

measuring a sublance when the converter blows to 85 percent, and performing end point control according to a sublance measurement result to ensure that the content of ferric oxide and the content of manganese oxide in the final smelting slag are 15 to 20 percent and 3.0 to 3.5 percent respectively;

adjusting the flow of bottom blowing argon, and performing blowing 80% of front bottom blowing flow of 220m³Per, 80% bottom blow flow to blowing end is performed at 350m³/h；

Controlling a smelting end point according to the steel grade requirement, wherein the carbon content meets 0.03-0.12%, the phosphorus content meets the steel grade requirement, the tapping temperature is 1660 ℃, and tapping operation is carried out after the component temperature meets the requirement.

7. The production method for improving the smelting efficiency of the converter according to claim 1, which is characterized in that: the molten iron comprises the following components in percentage by weight: 4.6%, Si: 0.43%, Mn: 0.11%, P: 0.129%, S: 0.045%, and the balance of Fe and inevitable impurities, wherein the temperature of molten iron is 1210 ℃;

adding a proper amount of manganese-iron alloy after the molten iron is pretreated to enable the content ratio of manganese to silicon to reach 0.8;

the converter adopts a top-bottom combined blowing mode, lime, light-burned dolomite and magnesium balls are added for slagging at one time 2min before blowing, and slagging is carried out by returning ores in the process to adjust the temperature so as to ensure stable slagging in the process;

measuring a sublance when the converter blows to 85 percent, and performing end point control according to a sublance measurement result to ensure that the content of ferric oxide and the content of manganese oxide in the final smelting slag are 15 to 20 percent and 3.0 to 3.5 percent respectively;

adjusting the flow of bottom blowing argon, and performing blowing 80% of front bottom blowing flow of 220m³Per, 80% bottom blow flow to blowing end is performed at 350m³/h；

Controlling a smelting end point according to the steel grade requirement, wherein the carbon content meets 0.03-0.12%, the phosphorus content meets the steel grade requirement, the tapping temperature is 1640 ℃, and tapping operation is carried out after the component temperature meets the requirement.

8. The production method for improving the smelting efficiency of the converter according to claim 1, which is characterized in that: the molten iron comprises the following components in percentage by weight: 4.7%, Si: 0.16%, Mn: 0.11%, P: 0.129%, S: 0.045%, and the balance of Fe and inevitable impurities, wherein the temperature of molten iron is 1220 ℃;

adding a proper amount of manganese-iron alloy after the molten iron is pretreated to enable the content ratio of manganese to silicon to reach 1.2;

the converter adopts a top-bottom combined blowing mode, lime, light-burned dolomite and magnesium balls are added for slagging at one time 2min before blowing, and slagging is carried out by returning ores in the process to adjust the temperature so as to ensure stable slagging in the process;

measuring a sublance when the converter blows to 85 percent, and performing end point control according to a sublance measurement result to ensure that the content of ferric oxide and the content of manganese oxide in the final smelting slag are 15 to 20 percent and 3.0 to 3.5 percent respectively;

adjusting the flow of bottom blowing argon, and performing blowing 80% of front bottom blowing flow of 220m³Per, 80% bottom blow flow to blowing end is performed at 350m³/h；

Controlling a smelting end point according to the steel grade requirement, wherein the carbon content meets 0.03-0.12%, the phosphorus content meets the steel grade requirement, the tapping temperature is 1620 ℃, and the tapping operation is carried out after the component temperature meets the requirement.