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

Active Publication Date: 2011-04-06
ZHONGXING ENERGY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too high slag basicity and too low Al 2 o 3 content usually leads to poor fluidity of slag, which is not conducive to the absorption of inclusions

Method used

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  • Rare earth oxide-containing steelmaking refining slag, and preparation method and using method thereof
  • Rare earth oxide-containing steelmaking refining slag, and preparation method and using method thereof
  • Rare earth oxide-containing steelmaking refining slag, and preparation method and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 200Kg induction furnace melting. 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°C, add ferromanganese and ferrosilicon for alloying; (3) Use an oxygen meter to measure the steel Active oxygen in the liquid, 150-200ppm; (4) Then add the refining slag CaO 52-58%, Al 2 o 3 22~30%, MgO 3~8%, SiO 2 4~12%, CaF 2 1 to 3%; (5) After 3 to 5 minutes, after the slag (primary slag) has been melted, add cerium oxide and other slag-forming materials, wait until the slag is completely melted evenly, and control the electric parameters of the induction furnace. The slag is well covered on the liquid steel surface, and the obtained new slag components are 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 aluminum bar...

Embodiment 2

[0036] 200Kg induction furnace melting. 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°C, add ferromanganese and ferrosilicon for alloying; (3) Use an oxygen meter to measure the steel Active oxygen in the liquid, 150-200ppm; (4) remove the surface residue produced in the smelting process; (5) then add 35Kg of the 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 to 4%; (6) After 3 to 5 minutes, the slag has been melted, and the electric parameters of the induction furnace are well controlled so that the added refining slag covers the liquid steel surface; (7) Insert an aluminum rod in the middle so that the acid-soluble aluminum content in the molten steel is controlled at 0.015-0.035%, and the molten steel is sampled after 1-2 minutes...

Embodiment 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 adds 15% scrap steel for blowing, and taps after completing decarburization, dephosphorization and end temperature control tasks; (2) Tapping should strictly control the slag, 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 lime and other slagging materials are added to deoxidize the molten steel with aluminum, and the slag is deoxidized with aluminum particles, silicon carbide, calcium carbide, etc. agent to make the FeO content in the slag less than 1.0%, the slag turns white, and the slag composition 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 0.035%, and the molten steel is sampled ...

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Abstract

The invention belongs to the technical field of steelmaking refining and relates to rare earth oxide-containing steelmaking refining slag, and a preparation method and a using method thereof. The invention is characterized in that: a refining slag system comprises the following chemical components in percentage by mass: 40 to 55 percent of calcium oxide (CaO), 6 to 25 percent of aluminum oxide (Al2O3), 3 to 16 percent of cerium trioxide (Ce2O3), 3 to 10 percent of magnesium oxide (MgO), 3 to 15 percent of silicon oxide (SiO) and 1 to 6 percent of calcium fluoride. The refining slag system hashigh melting property, melting temperature of between 1,300 and 1,370 DEG C, low viscosity value of 0.1 to 0.3 Pa.s at the steelmaking temperature of between 1,550 and 1,600 DEG C and high flowability. Molten steel refining tests in a 200-kg induction furnace, a 100-t combined blown converter and a 60-t arc furnace show that compared with the traditional refining slag system, the refining slag system provided by the invention has deoxidizing rate and impurity level reduction rate of over 15 percent and effectively improving refining efficiency.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and refining, and relates to a steelmaking and refining slag containing rare earth oxides and a preparation and use method. Background technique [0002] Aluminum killed steel, Al 2 o 3 It is the main type of inclusions. This kind of hard and brittle inclusions will not only easily cause the blockage of the continuous casting submerged nozzle and reduce the production efficiency, but also seriously affect the performance of the steel. Therefore, to effectively remove Al from steel 2 o 3 Inclusions have always been a research topic of extensive concern to steelmakers. The way to remove inclusions is usually to use the density difference between inclusions and molten steel (the density of inclusions is 2.5 ~ 3.5g / cm 3 , while the density of molten steel is 7.0g / cm 3 Left and right) to promote the inclusions in the molten steel to float to the steel slag interface, and then be absorbed by t...

Claims

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Application Information

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IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 成国光龙鹄吴彬姜方马小春
Owner ZHONGXING ENERGY EQUIP
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