Method for reducing semisteel steel-making final slag total iron content
A technology of iron content and final slag, applied in the field of metallurgy, can solve the problem of high cost, achieve low cost, reduce steelmaking cost, and reduce obvious effects
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Embodiment 1
[0025] The 120t converter of a factory uses semi-steel steelmaking. The oxygen activity of the molten steel measured by the sub-gun TSO probe at the end of the smelting of the converter is 621ppm. According to the oxygen activity of the molten steel, 240kg of magnesium carbon balls are added to the furnace through the silo (the composition of the magnesium carbon balls is : MgO 40%, CaO 40%, C 10%, the rest is a small amount of impurities; particle size: 20 ~ 40mm), using the top gun to blow nitrogen for 20s, the nitrogen blowing intensity is 3m 3 / t·min, the working pressure is 0.6Mpa, the position of the blowing gun is 2.1m, and the steel is tapped after standing still for 60s after nitrogen blowing, and the TFe content in the steel slag is only 17.2% according to sampling analysis.
Embodiment 2
[0027] A 200t converter in a factory uses semi-steel steelmaking. The oxygen activity of the molten steel measured by the sub-gun TSO probe at the end of the converter smelting is 796ppm. After adding 600kg of magnesium carbon balls into the furnace through the feed bin (the composition of magnesium carbon balls is: MgO 50%, CaO 35%, C 8%, the rest is a small amount of impurities; particle size: 20 ~ 40mm), use the top gun to blow nitrogen for 30s, and the nitrogen blowing intensity is 3.2m 3 / t·min, the working pressure is 0.7Mpa, the position of the blowing gun is 1.9m, and the steel is tapped after standing still for 90s after nitrogen blowing, and the TFe content in the steel slag is only 17.8% according to sampling analysis.
Embodiment 3
[0029] A 120t converter in a factory uses semi-steel steelmaking. The oxygen activity of the molten steel measured by the sub-lance TSO probe at the end of the converter smelting is 869ppm. After adding 360kg of magnesium carbon balls into the furnace through the feed bin (the composition of magnesium carbon balls is: MgO 50%, CaO 30%, C 9%, the rest is a small amount of impurities; particle size: 20 ~ 40mm), using the top gun to blow nitrogen for 35s, the nitrogen blowing intensity is 3.5m 3 / t·min, the working pressure is 0.8Mpa, the blowing gun position is 1.8m, and the steel is tapped after standing still for 100s after nitrogen blowing. The TFe content in the steel slag is only 17.1% according to sampling analysis.
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