Environmentally friendly flux for molten steel desulfurization
View Patent ↗An environmentally friendly flux for molten steel desulfurization includes CaO and Al 2 O 3 so that [CaO]/[Al 2 O 3 ] is within a range of 1.6 to 3.0, and includes one or more alkali metal oxides of Na 2 O, K 2 O, and Li 2 O, and SiO 2 so that [SiO 2 ]/[R 2 O] is within a range of 0.1 to 3, [R 2 O] is within a range of 0.5 mass % to 5 mass %, and [SiO 2 ] is within a range of 0.05 mass % to 15 mass % in a case in which the [CaO], the [Al 2 O 3 ], the [SiO 2 ], and the [R 2 O] represent the mass % of CaO, the mass % of Al 2 O 3 , the mass % of SiO 2 , and the total amount of the mass % of Na 2 O, the mass % of K 2 O, and the mass % of Li 2 O respectively.
1. An environmentally friendly flux for molten steel desulfurization comprising:
CaO and Al 2 O 3 so that [CaO] is 61 to 75 mass % and [CaO]/[Al 2 O 3 ] is within a range of 1.6 to 3.0; and one or more alkali metal oxides of Na 2 O, K 2 O, and Li 2 O, and SiO 2 so that [SiO 2 ]/[R 2 O] is within a range of 0.1 to 3, [R 2 O] is within a range of 0.5 mass % to 5 mass %, and [SiO 2 ] is within a range of 0.05 mass % to 15 mass %, in a case in which the [CaO], the [Al 2 O 3 ], the [SiO 2 ], and the [R 2 O] represent mass % of CaO, mass % of Al 2 O 3 , mass % of SiO 2 , and a total amount of mass % of Na 2 O, mass % of K 2 O, and mass % of Li 2 O respectively.
2. The environmentally friendly flux for molten steel desulfurization according to claim 1 , further comprising 1 mass % to 10 mass % of MgO.
3. The environmentally friendly flux for molten steel desulfurization according to claim 1 or 2 , wherein the [SiO 2 ] is 0.05 mass % to 9.3 mass %.
4. The environmentally friendly flux for molten steel desulfurization according to claim 1 or 2 , wherein the [SiO 2 ] is 0.05 mass % to 8.0 mass %.
5. The environmentally friendly flux for molten steel desulfurization according to claim 1 or 2 , wherein the [SiO 2 ]/[R 2 O] is 0.1 to 2.
6. The environmentally friendly flux for molten steel desulfurization according to claim 1 or 2 , wherein some or all of the alkali metal oxides have a chemical bond with the SiO 2 .
7. The environmentally friendly flux for molten steel desulfurization according to claim 1 or 2 , wherein the alkali metal oxides are Na 2 O.
8. A molten steel desulfurization method comprising supplying the environmentally friendly flux for molten steel desulfurization according to claim 1 or 2 to a molten steel.
9. A molten steel desulfurization method comprising forming a slag on a surface of a molten steel, the slag including one or more of Na 2 O, K 2 O, and Li 2 O, as well as CaO, Al 2 O 3 , and SiO 2 so that [CaO] is 61 to 75 mass %, and [CaO]/[Al 2 O 3 ] is within a range of 1.6 to 3.0, [SiO 2 ]/[R 2 O] is within a range of 0.1 to 3, [R 2 O] is within a range of 0.5 mass % to 5 mass %, and [SiO 2 ] is within a range of 0.05 mass % to 15 mass %, in a case in which the [CaO], the [Al 2 O 3 ], the [SiO 2 ], and the [R 2 O] represent mass % of CaO, mass % of Al 2 O 3 , mass % of SiO 2 , and a total amount of mass % of Na 2 O, mass % of K 2 O, and mass % of Li 2 O respectively.