Method for protecting converter through slag splashing by using carbon dioxide and nitrogen
A technology of carbon dioxide and slag splashing to protect the furnace, which is applied to the improvement of process efficiency and the manufacture of converters, etc., can solve the problems of inability to efficiently splash slag and improve the operation rate of the converter, so as to facilitate maintenance and long-life operation, and improve corrosion resistance , good economic and social benefits
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Embodiment 1
[0019] A method for protecting the furnace by splashing slag with carbon dioxide and nitrogen, smelting steel type CSPSPHC, with an end point carbon content of 0.038%, and an end point temperature of 1693°C. After tapping, pour out 1 / 2 of the slag in the converter, including the following steps:
[0020] a. Shake the furnace to the normal smelting position, add 1.8-2.0kg / t of slag splashing material containing 15-25% carbon and 14-24% magnesium according to the tapping temperature, and fix the gun position at 200mm higher than the blowing gun position , the slag splashing gas is all carbon dioxide, the gas pressure is 1.2MPa, the carbon dioxide blowing gun position is 1m, and the slag splashing can be seen after blowing to the furnace mouth for 45-50s;
[0021] b. Fix the gun position between 200-1000mm higher than the blowing gun position for circular injection, switch the slag splashing gas to a mixed gas of carbon dioxide and nitrogen, and the content of carbon dioxide and n...
Embodiment 2
[0024] A method for protecting the furnace by splashing slag with carbon dioxide and nitrogen, smelting steel type 355B, with an end point carbon content of 0.078%, and an end point temperature of 1710°C. After tapping, pour out 1 / 2 of the slag in the converter, including the following steps:
[0025] a. Shake the furnace to the normal smelting position, add 1.6-1.8kg / t of slag splashing material containing 15-25% carbon and 14-24% magnesium according to the tapping temperature, and fix the gun position at 200mm higher than the blowing gun position , the slag splashing gas is all carbon dioxide, the gas pressure is 1.2MPa, the carbon dioxide blowing gun position is 1m, and the slag splashing can be seen after blowing to the furnace mouth for 35-40s;
[0026] b. Fix the gun position between 200-1000mm higher than the blowing gun position for circular injection, switch the slag splashing gas to a mixed gas of carbon dioxide and nitrogen, and the content of carbon dioxide and nitr...
Embodiment 3
[0029] A method of using carbon dioxide and nitrogen to splash slag to protect the furnace. The smelting steel is 70#, the end point carbon content is 0.65%, and the end point temperature is 1650°C. After the steel tapping is completed, 2 / 3 of the slag in the converter is poured out, including the following steps:
[0030] a. Shake the furnace to the normal smelting position, add 0.8-1.0kg / t of slag splashing material containing 15-25% carbon and 14-24% magnesium according to the tapping temperature, and fix the gun position at 200mm higher than the blowing gun position , the slag splashing gas is all carbon dioxide, the gas pressure is 1.2MPa, the carbon dioxide blowing gun position is 1m, and the slag splashing can be seen after blowing to the furnace mouth for 25-30s;
[0031] b. Fix the gun position between 200-1000mm higher than the blowing gun position for circular injection, switch the slag splashing gas to a mixed gas of carbon dioxide and nitrogen, and the content of c...
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