Method for synchronously dephosphorization and vanadium extraction of vanadium-containing molten iron
A technology for molten iron and pig iron, which is applied in the manufacture of converters, etc., can solve the problems of furnace lining erosion and serious problems, and achieve the effect of reducing steel material consumption, reducing TFe content and avoiding erosion.
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example 1
[0022] After the 200t vanadium extracting converter has mixed iron, the temperature of the vanadium-containing molten iron is 1310°C, and 15t pig iron blocks are added to cool down; after the pig iron blocks are added, the oxygen-reducing lance is blown, and the oxygen flow rate is controlled at 25000Nm throughout the process 3 / h; 1-2 minutes before blowing, the gun position is controlled by 1.8m, and iron oxide scale and lime are added at the same time. The amount of oxide scale is controlled by 20kg / tFe, and the amount of lime added is 10kg / tFe; m control, and at the same time add the second batch of iron oxide scales to control the temperature within 3 minutes of blowing oxygen, and the amount of iron oxide scales is controlled by 18kg / tFe; The height is reduced to 1.7m; semi-steel and vanadium slag are produced after blowing. In this example, the total blowing time for oxygen lance blowing is 5.5 minutes.
[0023] The vanadium content in molten iron is 0.330%, and the ph...
example 2
[0025] After the 120t vanadium-extracting converter has mixed iron, the temperature of the vanadium-containing molten iron is 1280°C, and 2t of pig iron blocks are added to cool down; after the pig iron blocks are added, the oxygen-reducing lance is blown, and the oxygen flow rate is controlled at 17000Nm throughout the process 3 / h; 1-2 minutes before blowing, the gun position is controlled by 1.6m, and iron oxide scale and lime are added at the same time. The amount of iron oxide scale is controlled by 10kg / tFe, and the amount of lime added is 8kg / tFe; m control, and at the same time add the second batch of iron oxide scales to control the temperature within 3 minutes of blowing oxygen, and the amount of iron oxide scales is controlled by 17kg / tFe; The gun position is lowered to 1.7m; semi-steel and vanadium slag are produced after blowing. In this example, the total blowing time for oxygen lance blowing is 6.0 minutes.
[0026]The vanadium content in molten iron is 0.302%,...
example 3
[0028] After the 200t vanadium-extracting converter has mixed iron, the temperature of the vanadium-containing molten iron is measured at 1250°C. After the temperature measurement is completed, the oxygen-reducing lance is used for blowing, and the oxygen flow rate is controlled at 23000Nm throughout the process. 3 / h; 1-2 minutes before blowing, the gun position is controlled by 1.7m, and iron oxide scale and lime are added at the same time. m control, and at the same time add the second batch of iron oxide scales to control the temperature within 3 minutes of blowing oxygen, and the amount of iron oxide scales is controlled by 18kg / tFe; The gun position is lowered to 1.6m; semi-steel and vanadium slag are produced after blowing. In this example, the total blowing time for oxygen lance blowing is 6.5 minutes.
[0029] The vanadium content in molten iron is 0.336%, and the phosphorus content is 0.061%. After blowing, the semi-steel has a vanadium content of 0.046%, a phosphor...
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