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

A technology of stainless steel and high carbon steel, applied in the field of metallurgy, can solve the problems of low metal recovery efficiency, long production process, complex recovery system, etc., achieve good environmental benefits, reduce the use of chromium alloys, and simplify the reduction process.

Active Publication Date: 2021-11-02
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • 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 pr

Method used

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

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0041] Example 1:

[0042] An LF furnace resource-based, producing chromium-containing high-carbon steel method, stainless steel dust removal gray, is 50 × 50 × 30 mm size, its chemical component 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 minimum amounts of other oxides. Using experimental furnace number 20210987, the LF steel baffle refining period is 58min, and the temperature is 27 min.

[0043]Step 1: refining the molten steel prior to entering links, keeping the carbon content of the molten steel of 0.75%, an oxygen content of the molten steel 20ppm.

[0044] Step 2: After the stop of molten steel, adjusting argon bubbling 40m 3 / H, added to the first active lime slag with 5kg / t and refining slag 1kg / t, fluorite 2kg / t.

[0045] Step 3: In the first heating process, argon bubbling adjust 30m 3 / H, stainless steel dust ash briquette press 2kg / t added in 3 ladle furnace, to enhanc...

Example Embodiment

[0051] Example 2:

[0052] One kind of utilization LF furnace dust ash producing stainless chromium-containing high-carbon steel, stainless steel dust ash compact size of 50 × 50 × 30mm, the chemical composition of 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. Experimental use of steel heat No. 20311765, LF ladle refining period of 55min, the heating time 25min.

[0053] Step 1: refining the molten steel prior to entering links, keeping the content of carbon in molten steel 0.78%, an oxygen content of the molten steel 18ppm.

[0054] Step 2: After the stop of molten steel, adjusting argon bubbling 30m 3 / H, the first active lime slag added with 4.4kg / t, refining slag 1.2kg / t and fluorite 2.4kg / t.

[0055] Step 3: In the first heating process, argon bubbling adjust 20m 3 / H, stainless steel dust ash briquette 4kg / t added in 3 ladle furnace, to enhance t...

Example Embodiment

[0061] Example 3:

[0062] One kind of utilization LF furnace dust ash producing stainless chromium-containing high-carbon steel, stainless steel dust ash compact size of 50 × 50 × 30mm, the chemical composition of 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. Experimental use of steel 82B, heat number 20311767, LF ladle refining period of 58min, the heating time 26min.

[0063] Step 1: refining the molten steel prior to entering links, keeping the content of carbon in molten steel 0.78%, an oxygen content of the molten steel 23ppm.

[0064] Step 2: After the stop of molten steel, adjusting argon bubbling 40m 3 / H, added to the first active lime slag with 5kg / t refining slag and 1.4kg / t, fluorite 2kg / t.

[0065] Step 3: In the first heating process, argon bubbling adjust 20m 3 / H, stainless steel dust ash batches compact 2.6kg / t added in 3 ladle furnac...

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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...

Claims

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Application Information

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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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