A preparation method for extracting carbon and preserving manganese from manganese, low-silicon, and high-phosphorus iron water in converter smelting
A technology for converter smelting and molten iron, applied in the manufacture of converters, improvement of process efficiency, etc., can solve problems such as carbon extraction and manganese preservation process, achieve good smelting slag dephosphorization effect, good slag dephosphorization, avoid spraying splash effect
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[0016] The method for preparing manganese, low-silicon and high-phosphorus hot metal in converter smelting according to the present invention to extract carbon and preserve manganese comprises the following process steps:
[0017] A. Smelting and charging process: after the steel tapping and slag splashing of the upper furnace, all the final slag is kept in the converter, according to 3.0-4.0kg / t 钢 The amount, add light burnt dolomite to the converter; according to 110-140kg / t 钢 The scrap steel is loaded into the ratio, and the scrap steel is added to the 50-ton LD converter; after that, it is 930-960kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of medium manganese, low silicon and high phosphorus molten iron are added to a 50-ton LD converter: molten iron temperature ≥ 1320 ° C, molten iron composition C 4.2-4.8wt%, Mn0.70-0.90wt%, Si 0.06-0.15wt%, P 0.130-0.220wt%, S≤0.045wt%, the rest is Fe and unavoidable impurities;
[0018...
Embodiment 1
[0029] A method for preparing manganese, low-silicon, and high-phosphorus iron in converter smelting by extracting carbon and preserving manganese in water, comprising the following process steps:
[0030] A. Smelting and loading process: After the steel tapping and slag splashing of the upper furnace, all the final slag is kept in the converter, according to 3.0kg / t 钢 The amount, add light burnt dolomite to the converter; according to 110kg / t 钢 The proportion of steel scrap is loaded into the 50-ton LD converter with the following mass ratio of steel scrap: C 0.22wt%, Si 0.40wt%, Mn 1.20wt%, P 0.025wt%, S 0.018wt%, the rest is Fe and unavoidable Impurities; then press 960kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of medium manganese, low silicon and high phosphorus molten iron are added to a 50-ton LD converter: molten iron temperature 1320 ° C, molten iron composition C 4.2wt%, Mn0.70wt%, Si 0.06wt%, P0 .130wt%, S 0.025wt%,...
Embodiment 2
[0036] A method for preparing manganese, low-silicon, and high-phosphorus iron in converter smelting by extracting carbon and preserving manganese in water, comprising the following process steps:
[0037] A. Smelting and loading process: after the steel tapping and slag splashing of the upper furnace, all the final slag is kept in the converter, according to 3.5kg / t 钢 The amount of light-burned dolomite is added to the converter; according to 125kg / t 钢 The proportion of scrap steel is loaded into the 50-ton LD converter with the following mass ratio of scrap steel: C 0.24wt%, Si 0.49wt%, Mn 1.35wt%, P 0.032wt%, S 0.025wt%, the rest is Fe and unavoidable Impurities; then press 945kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of medium manganese, low silicon and high phosphorus molten iron are added to a 50-ton LD converter: molten iron temperature 1335 ° C, molten iron composition C 4.5wt%, Mn0.80wt%, Si 0.10wt%, P0 .175wt%, S 0...
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