Rare earth oxide-containing steelmaking refining slag, and preparation method and using method thereof
A rare earth oxide and refining slag technology, applied in the field of steelmaking and refining, can solve the problems of unfavorable inclusion absorption and fluidity deterioration, and achieve the effects of good fluidity, low melting temperature and rich slagging resources
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[0028] Example 1
[0029] Smelting in a 200Kg induction furnace. The operation steps are as follows: (1) Add 160Kg of high-quality low-carbon scrap steel and melt it with electricity; (2) When the melting is completed, the temperature is 1580℃, add ferromanganese and ferrosilicon for alloying; (3) Determine the steel with an oxygen meter Activity oxygen in the liquid, 150~200ppm; (4) Then add 52~58% CaO, Al 2 O 3 22~30%, MgO 3~8%, SiO 2 4~12%, CaF 2 1~3%; (5) After 3~5 minutes, after the slag (initial slag) has been melted, add cerium oxide and other slag-making materials, wait until the slag is all melted uniformly, and control the electric parameters of the induction furnace to melt The slag better covers the molten steel surface, and the obtained new slag system composition is controlled within the scope of the present invention: CaO 50-55%, Al 2 O 3 20-25%, Ce 2 O 3 4~8%, MgO 3~6%, SiO 2 8~10%, CaF 2 1.5-4%, the total slag amount is 35Kg; (6) Insert an aluminum rod int...
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[0035] Example 2
[0036] Smelting in a 200Kg induction furnace. The operation steps are as follows: (1) Add 160Kg of high-quality low-carbon scrap steel and melt it with electricity; (2) When the melting is completed, the temperature is 1580℃, add ferromanganese and ferrosilicon for alloying; (3) Determine the steel with an oxygen meter Active oxygen in the liquid, 150~200ppm; (4) Strip off the surface residue produced during the smelting process; (5) Then add 35Kg of pre-melted refining slag of the present invention, the slag composition is: CaO 45~52%, Al 2 O 3 12~25%, Ce 2 O 3 3~16%, MgO 3~6%, SiO 2 8~10%, CaF 2 1.5~4%; (6) After 3~5 minutes, wait until the slag has been melted, and control the electric parameters of the induction furnace, so that the added refining slag better covers the molten steel surface; (7) To the molten steel Insert an aluminum rod to control the acid-soluble aluminum content in the molten steel at 0.015~0.035%. Take a sample of the molten steel a...
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[0040] Example 3
[0041] The experiment was carried out on a 100-ton top-blown oxygen converter. The test steps are as follows: (1) The converter uses 85% molten iron and 15% of scrap steel is added for blowing, and the steel is tapped after the tasks of decarburization, dephosphorization and end-point temperature control are completed; (2) The tapping must strictly control slag retention. After tapping, the amount of slag in the ladle is less than 80mm; (3) The ladle is transported to the refining station of the LF furnace, and then slagging materials such as lime are added to deoxidize the molten steel. The slag is deoxidized with aluminum particles, silicon carbide, calcium carbide, etc. The content of FeO in the slag is less than 1.0%, the slag becomes white, and the composition of the slag meets the requirements of CaO 52~58%, Al 2 O 3 22~30%, MgO 3~8%, SiO 2 4~12%, CaF 2 1 to 3%, so that the content of acid-soluble aluminum in the molten steel is controlled at 0.015 to 0...
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