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

A stainless steel and high-carbon steel technology, applied in the field of metallurgy, can solve problems such as long production process, low metal recovery efficiency, complex recovery system, etc., and achieve the effects of reducing the amount of chromium alloy used, good environmental benefits, and simplifying the reduction process

Active Publication Date: 2022-07-08
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned treatment processes can reduce the biological toxicity of dust removal ash and restore and recover valuable metals in dust removal ash, but there are problems such as complex recovery system, long production process, high treatment cost, high energy consumption, and low metal recovery efficiency in the utilization process.

Method used

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  • A method for producing chromium-containing high carbon steel by using stainless steel dust
  • A method for producing chromium-containing high carbon steel by using stainless steel dust
  • A method for producing chromium-containing high carbon steel by using stainless steel dust

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A method for producing chromium-containing high-carbon steel by utilizing stainless steel dust as a resource in LF furnace. 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 used, the refining cycle of the LF ladle furnace was 58 minutes, and the heating time was 27 minutes.

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

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

[0045] Step 3: During the first heating process, adjust the bottom blowing argon for 30m 3 / h, the stainless steel dust briquettes are added to the ladle furnace in three bat...

Embodiment 2

[0052] A method for producing chromium-containing high-carbon steel by utilizing stainless steel dust as a resource in LF furnace. 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: Treat the molten steel before entering the refining process to keep the carbon content in the molten steel at 0.78% and the oxygen content in the molten steel at 18 ppm.

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

[0055] Step 3: During the first heating process, adjust the bottom blowing argon 20m 3 / h, add 4kg / t of stainless steel dust briquettes into the ladle furnace in three batches...

Embodiment 3

[0062] A method for producing chromium-containing high-carbon steel by utilizing stainless steel dust as a resource in LF furnace. 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 grade is 82B, the heat number is 20311767, the refining cycle of the LF ladle furnace is 58 minutes, and the heating time is 26 minutes.

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

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

[0065] Step 3: During the first heating process, adjust the bottom blowing argon 20m 3 / h, add 2.6kg / t stainless steel dust-removing ash briquette into the la...

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Abstract

The invention discloses a method for producing chromium-containing high-carbon steel by using stainless steel dust ash. Add slag; the first time to heat up to adjust the bottom blowing argon, add stainless steel dust removal ash briquette and add ferrosilicon; the second time to heat up to adjust the bottom blowing argon, add slag, and adjust the composition to the target. By adjusting and controlling the bottom blowing flow rate at different stages of the refining process, the contact area between the steel slag can be fully increased, the slag washing effect in the refining process can be increased, and the metal chromium reduced from the slag can be diffused into the molten steel. The reduced Cr in the slag is more likely to diffuse into the steel, thereby improving the yield of Cr in the smelting process.

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 using stainless steel dust. Background technique [0002] Stainless steel dust dust is a mixture collected by various dust removal equipment in the process of stainless steel smelting. It mainly contains metal oxides such as Cr and Fe, especially Cr. 6+ Due to the high toxicity of ions, they will cause serious damage to the surrounding animals and plants after being immersed in water bodies, and are classified as hazardous wastes. Metals are also not recycled, resulting in a waste of resources. At present, rotary hearth furnace, blast furnace, sintering machine, submerged arc furnace and other equipment are mainly used to deal with stainless steel dust. The above-mentioned treatment processes can reduce the biological toxicity of dust removal ash and restore and recover valuable metals in dust remova...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/076C21C7/072C21C7/06
CPCC21C7/0006C21C7/0075C21C7/076C21C7/0087C21C7/072C21C7/06Y02P10/20
Inventor 胡明范伟王立洲翟有有姜军张伟黄文胜杨超杨刚
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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