Method for producing chromium-containing high-carbon steel by using stainless steel dust

Abstract

The invention discloses a method for producing chromium-containing high-carbon steel by using stainless steel dust. The method comprises the following steps of adjusting the carbon content in molten steel and the oxygen content in the molten steel before refining in an LF ladle furnace; adjusting bottom blowing argon, and adding slag charge after the molten steel enters a ladle refining furnace; heating for the first time to adjust bottom blowing argon, and adding stainless steel dust briquettes and silicon iron; and heating for the second time to adjust bottom blowing argon, adding the slag charge, and adjusting the components to the target. Through adjustment and control of the bottom blowing flow in different stages of the refining process, the contact area between the steel slag can be fully increased, and the slag washing effect in the refining process is improved; a good dynamic condition is provided for diffusion of metal chromium reduced from the slag into the molten steel, and reduced Cr in the molten slag is prone to diffuse into the steel; and therefore that the yield in the Cr smelting process is improved.

Description

technical field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing chromium-containing high-carbon steel by utilizing stainless steel dedusting ash. Background technique

[0002] Stainless steel dust is a mixture collected by various dust removal equipment during the stainless steel smelting process. It mainly contains metal oxides such as Cr and Fe, especially Cr 6+ Due to its high toxicity, ions will cause serious damage to the surrounding animals and plants after being immersed in the water body. Metals also cannot be recycled, resulting in a waste of resources. Currently, rotary hearth furnaces, blast furnaces, sintering machines, submerged arc furnaces and other equipment are mainly used to process stainless steel dust. The above-mentioned treatment processes can reduce the biological toxicity of the dedusting ash and restore and recover the valuable metals in the dedusting ash, but there are problems...

Examples

Embodiment 1

[0042] A method for producing chromium-containing high-carbon steel by utilizing stainless steel dust removal dust in LF furnace resources. The stainless steel dust removal dust compact size is 50×50×30mm, and its chemical composition is CaO: 10-15% (wt), SiO 2 : 4-12% (wt), TFe: 30-35% (wt), TCr: 10-15% (wt), TNi: 0.5-1.5% (wt), MnO: 2-5% (wt), MgO : 2-5% (wt) and a very small amount of other oxides. The experimental furnace number 20210987 was adopted, the refining cycle of the LF ladle furnace was 58 minutes, and the heating time was 27 minutes.

[0043]Step 1: Process the molten steel before entering the refining link, keep the carbon content in the molten steel at 0.75%, and the oxygen content in the molten steel at 20ppm.

[0044] Step 2: After the molten steel enters the station, adjust the bottom blowing argon to 40m 3 / h, add 5kg / t of active lime for the first batch of slagging, 1kg / t of refining slag, and 2kg / t of fluorite.

[0045] Step 3: During the first temper...

Embodiment 2

[0052] A method for producing chromium-containing high-carbon steel by utilizing stainless steel dust removal dust in LF furnace resources. The stainless steel dust removal dust compact size is 50×50×30mm, and its chemical composition is CaO: 10-15% (wt), SiO 2 : 4-12% (wt), TFe: 30-35% (wt), TCr: 10-15% (wt), TNi: 0.5-1.5% (wt), MnO: 2-5% (wt), MgO : 2-5% (wt) and a very small amount of other oxides. The experimental steel furnace number 20311765 was used, the refining cycle of the LF ladle furnace was 55 minutes, and the heating time was 25 minutes.

[0053] Step 1: Process the molten steel before entering the refining link, keep the carbon content in the molten steel at 0.78%, and the oxygen content in the molten steel at 18ppm.

[0054] Step 2: After the molten steel enters the station, adjust the bottom blowing argon to 30m 3 / h, add 4.4kg / t of active lime for the first batch of slagging, 1.2kg / t of refining slag and 2.4kg / t of fluorite.

[0055] Step 3: During the fir...

Embodiment 3

[0062] A method for producing chromium-containing high-carbon steel by utilizing stainless steel dust removal dust in LF furnace resources. The stainless steel dust removal dust compact size is 50×50×30mm, and its chemical composition is CaO: 10-15% (wt), SiO 2 : 4-12% (wt), TFe: 30-35% (wt), TCr: 10-15% (wt), TNi: 0.5-1.5% (wt), MnO: 2-5% (wt), MgO : 2-5% (wt) and a very small amount of other oxides. The steel type used in the experiment is 82B, the furnace number is 20311767, the refining cycle of the LF ladle furnace is 58 minutes, and the heating time is 26 minutes.

[0063] Step 1: Process the molten steel before entering the refining link, keep the carbon content in the molten steel at 0.78%, and the oxygen content in the molten steel at 23ppm.

[0064] Step 2: After the molten steel enters the station, adjust the bottom blowing argon to 40m 3 / h, add 5kg / t of active lime for the first batch of slagging, 1.4kg / t of refining slag, and 2kg / t of fluorite.

[0065] Step 3...

technical field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing chromium-containing high-carbon steel by utilizing stainless steel dedusting ash. Background technique

[0002] Stainless steel dust is a mixture collected by various dust removal equipment during the stainless steel smelting process. It mainly contains metal oxides such as Cr and Fe, especially Cr 6+ Due to its high toxicity, ions will cause serious damage to the surrounding animals and plants after being immersed in the water body. Metals also cannot be recycled, resulting in a waste of resources. Currently, rotary hearth furnaces, blast furnaces, sintering machines, submerged arc furnaces and other equipment are mainly used to process stainless steel dust. The above-mentioned treatment processes can reduce the biological toxicity of the dedusting ash and restore and recover the valuable metals in the dedusting ash, but there are problems...

Examples

Embodiment 1

[0042] A method for producing chromium-containing high-carbon steel by utilizing stainless steel dust removal dust in LF furnace resources. The stainless steel dust removal dust compact size is 50×50×30mm, and its chemical composition is CaO: 10-15% (wt), SiO 2 : 4-12% (wt), TFe: 30-35% (wt), TCr: 10-15% (wt), TNi: 0.5-1.5% (wt), MnO: 2-5% (wt), MgO : 2-5% (wt) and a very small amount of other oxides. The experimental furnace number 20210987 was adopted, the refining cycle of the LF ladle furnace was 58 minutes, and the heating time was 27 minutes.

[0043]Step 1: Process the molten steel before entering the refining link, keep the carbon content in the molten steel at 0.75%, and the oxygen content in the molten steel at 20ppm.

[0044] Step 2: After the molten steel enters the station, adjust the bottom blowing argon to 40m 3 / h, add 5kg / t of active lime for the first batch of slagging, 1kg / t of refining slag, and 2kg / t of fluorite.

[0045] Step 3: During the first temper...

Embodiment 2

[0052] A method for producing chromium-containing high-carbon steel by utilizing stainless steel dust removal dust in LF furnace resources. The stainless steel dust removal dust compact size is 50×50×30mm, and its chemical composition is CaO: 10-15% (wt), SiO 2 : 4-12% (wt), TFe: 30-35% (wt), TCr: 10-15% (wt), TNi: 0.5-1.5% (wt), MnO: 2-5% (wt), MgO : 2-5% (wt) and a very small amount of other oxides. The experimental steel furnace number 20311765 was used, the refining cycle of the LF ladle furnace was 55 minutes, and the heating time was 25 minutes.

[0053] Step 1: Process the molten steel before entering the refining link, keep the carbon content in the molten steel at 0.78%, and the oxygen content in the molten steel at 18ppm.

[0054] Step 2: After the molten steel enters the station, adjust the bottom blowing argon to 30m 3 / h, add 4.4kg / t of active lime for the first batch of slagging, 1.2kg / t of refining slag and 2.4kg / t of fluorite.

[0055] Step 3: During the fir...

Embodiment 3

[0062] A method for producing chromium-containing high-carbon steel by utilizing stainless steel dust removal dust in LF furnace resources. The stainless steel dust removal dust compact size is 50×50×30mm, and its chemical composition is CaO: 10-15% (wt), SiO 2 : 4-12% (wt), TFe: 30-35% (wt), TCr: 10-15% (wt), TNi: 0.5-1.5% (wt), MnO: 2-5% (wt), MgO : 2-5% (wt) and a very small amount of other oxides. The steel type used in the experiment is 82B, the furnace number is 20311767, the refining cycle of the LF ladle furnace is 58 minutes, and the heating time is 26 minutes.

[0063] Step 1: Process the molten steel before entering the refining link, keep the carbon content in the molten steel at 0.78%, and the oxygen content in the molten steel at 23ppm.

[0064] Step 2: After the molten steel enters the station, adjust the bottom blowing argon to 40m 3 / h, add 5kg / t of active lime for the first batch of slagging, 1.4kg / t of refining slag, and 2kg / t of fluorite.

[0065] Step 3...

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