Converter manganese ore direct alloying steelmaking method
An alloying steelmaking and alloying technology, applied in the manufacture of converters, etc., can solve the problems of poor dephosphorization effect and difficulty in semi-steel, and achieve the effects of increasing manganese content, high yield, and reducing converter smelting costs
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[0031] Example 1
[0032] The phosphorus content of the molten iron entering the 120t converter of a certain plant is 0.080%.
[0033] The invention is used for smelting, the first batch of slag-making materials is added after the converter iron is added to control the slag basicity to be 1.2, the lower lance blowing, the oxygen supply intensity of the top blowing oxygen lance is 3m 3 / t·min, bottom blowing air supply intensity is 0.1m 3 / t·min, add the second batch of slagging materials to control the slag basicity 2.5 when the blowing reaches 3min, and reduce the gas supply intensity of bottom blowing to 0.05-0.1m 3 / t·min, when the carbon content of the molten iron in the furnace is 1.0%, the furnace is discharged and the slag is discharged. When the slag is discharged, the strength of bottom blowing gas supply is reduced to 0.03m 3 / t·min;
[0034] After slagging, the secondary slagging is carried out. When the secondary slagging is started, 5kg / t steel of high-magnesium lime and ...
Example Embodiment
[0036] Example 2
[0037] The phosphorus content of the molten iron entering the 120t converter of a certain plant is 0.095%.
[0038] The invention is used for smelting, the first batch of slag-making materials is added after the converter iron is added to control the slag basicity to be 1.5, the lower lance blowing, the oxygen supply intensity of the top blowing oxygen lance is 4m 3 / t·min, bottom blowing air supply intensity is 0.2m 3 / t·min, when the blowing reaches 3min; adding the second batch of slagging materials to control the slag basicity 3.0, the bottom blowing gas supply intensity is reduced to 0.1m 3 / t·min. When the carbon content of the molten iron in the furnace is 1.5%, the furnace is poured and the slag is discharged. When the slag is discharged, the strength of bottom blowing gas supply is reduced to 0.05m 3 / t·min;
[0039] After slagging, the secondary slagging is carried out. When the secondary slagging is started, 8kg / t steel of high magnesium lime and 7kg / t s...
Example Embodiment
[0041] Example 3
[0042] The phosphorus content of the molten iron entering the 120t converter of a certain plant is 0.090%.
[0043] The invention is used for smelting, the first batch of slag-making materials is added after the converter iron is added to control the slag basicity to be 1.4, the bottom lance blowing, the oxygen supply intensity of the top blowing oxygen lance is 3.5m 3 / t·min, bottom blowing air supply intensity is 0.15m 3 / t·min, when blowing to 3min; adding the second batch of slagging materials to control the slag basicity 2.8, and the bottom blowing gas supply intensity is reduced to 0.08m 3 / t·min. When the carbon content of the molten iron in the furnace is 1.3%, the furnace is poured and the slag is discharged. When the slag is discharged, the strength of bottom blowing gas supply is reduced to 0.04m 3 / t·min;
[0044] After slagging, the secondary slagging is carried out. When the secondary slagging is started, 6kg / t steel of high magnesium lime and 8kg / t s...
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