Fluorine-free efficient dephosphorizing agent for pretreatment of chromium-containing molten iron
The technology of molten iron pretreatment and dephosphorization agent is applied in the field of iron and steel metallurgy, which can solve the problems of low dephosphorization rate, difficulty in slag removal, environmental pollution of dephosphorization agent, etc. The effect of improving slag fluidity
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[0043] Example 1
[0044] In this embodiment, the mass percentage of each component of the dephosphorizing agent containing chromium molten iron is: 6% CaO, 20% BaCO 3 , 50.5% Fe 2 O 3 , 12.5% CAF 2 , 5% Cr 2 O 3 , 6% CeO 2 .
[0045] Such as figure 1 As shown, the powders of the above components are mixed according to the set ratio to prepare a slag. Add pig iron (by mass percentage, [%C]=4.23%, [%P]=0.130%, [%Cr]=0.5%, [%Si]=0.34%) into the alumina crucible, and the graphite crucible is jacketed Put the protection into the muffle furnace and heat up to 1400℃, and pass in the argon protection, until the pig iron is completely melted, add the slag to the molten iron at a mass ratio of 1:5, stir with a steel rod every 5 minutes, keep warm After 25 minutes, take out the crucible and place it in cooling water to quickly cool to room temperature.
[0046] Chemical analysis of the iron sample showed that after dephosphorization, the silicon content in the molten iron was less than 0....
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[0047] Example 2
[0048] The basic content of this embodiment is the same as that of embodiment 1, the difference is: in this embodiment, the mass percentage of each component of the dephosphorization agent containing chromium molten iron is: 6% CaO, 20% BaCO 3 , 50.5% Fe 2 O 3 , 12.5%CaF 2 , 5% Cr 2 O 3 , 6% La 2 O 3 .
[0049] The powders of the above ingredients are mixed according to the set ratio to make a mixed slag. Add pig iron (in terms of mass percentage, [%C] = 3.81%, [% P] = 0.120%, [% Cr] = 0.25%, [% Si] = 0.31%) into the alumina crucible, and coat the graphite crucible Put the protection into the muffle furnace and heat up to 1400℃, and pass in the argon protection, until the pig iron is completely melted, add the slag to the molten iron at a mass ratio of 1:5, stir with a steel rod every 5 minutes, keep warm After 25 minutes, take out the crucible and place it in cooling water to quickly cool to room temperature.
[0050] Chemical analysis of the iron sample showed ...
Example Embodiment
[0051] Example 3
[0052] The basic content of this embodiment is the same as that of embodiment 1, the difference is: in this embodiment, the mass percentage of each component of the dephosphorization agent containing chromium molten iron is: 6% CaO, 20% BaCO 3 , 50.5% Fe 2 O 3 , 12.5%CaF 2 , 5% Cr 2 O 3 , 6% Li 2 CO 3 .
[0053] The powders of the above ingredients are mixed according to the set ratio to make a mixed slag. Add pig iron (in terms of mass percentage, [%C]=4.26%, [%P]=0.16%, [%Cr]=0.25%, [%Si]=0.32%) into the alumina crucible, and coat the graphite crucible Put the protection into the muffle furnace and heat up to 1400℃, and pass in the argon protection, until the pig iron is completely melted, add the slag to the molten iron at a mass ratio of 1:5, stir with a steel rod every 5 minutes, keep warm After 25 minutes, take out the crucible and place it in cooling water to quickly cool to room temperature.
[0054] Chemical analysis of the iron sample showed that after ...
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