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Method for inhibiting generation of vanadium extraction semi-steel smoke dust

A soot, tons of steel technology, applied in the field of metallurgy, can solve the problems of molten steel splashing, polluting the environment, affecting the cleanliness of semi-steel, etc., to achieve the effects of avoiding secondary oxidation, fast slag formation, and improving purification effect

Active Publication Date: 2021-02-02
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above process will not only cause molten steel to splash and pollute the environment, but also affect the cleanliness of semi-steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for suppressing the generation of smoke from vanadium-extracting semi-steel, comprising the steps of:

[0026] S1: Send 120 tons of vanadium-containing molten iron into the vanadium extraction converter for vanadium extraction, and control the final temperature of vanadium extraction semi-steel to 1355°C;

[0027] S2: Tap out the steel, inject nitrogen from the spray gun, and adjust the injection pressure of nitrogen to 1.1MPa. First, use the nitrogen spray gun to spray passivated lime powder, lightly burned dolomite powder and aluminum-manganese alloy deoxidizer (50% aluminum, 40% manganese) %, the unavoidable impurity content is not more than 3%, and the balance is iron), and then continue to spray passivated lime powder and lightly burned dolomite powder separately, wherein the injection amount of aluminum-manganese alloy deoxidizer is 0.4kg / ton of steel, The injection time is 2min, the injection amount of passivated lime powder is 2.3kg / ton steel, the injec...

Embodiment 2

[0029] A method for suppressing the generation of smoke from vanadium-extracting semi-steel, comprising the steps of:

[0030] S1: Send 120 tons of vanadium-containing molten iron into the vanadium extraction converter for vanadium extraction, and control the final temperature of vanadium extraction semi-steel to 1395°C;

[0031] S2: Tap out the steel, inject nitrogen from the spray gun, and adjust the injection pressure of nitrogen to 1.3MPa, first use the nitrogen spray gun to spray passivated lime powder, lightly burned dolomite powder and aluminum-manganese alloy deoxidizer (45% aluminum, 30% manganese) %, the unavoidable impurity content is not more than 3%, and the balance is iron), and then continue to spray passivated lime powder and lightly burned dolomite powder separately, wherein the injection amount of aluminum-manganese alloy deoxidizer is 0.7kg / ton of steel, The injection time is 4min, the injection amount of passivated lime powder is 3.3kg / ton steel, the inject...

Embodiment 3

[0033] A method for suppressing the generation of smoke from vanadium-extracting semi-steel, comprising the steps of:

[0034] S1: Send 120 tons of vanadium-containing molten iron into the vanadium extraction converter for vanadium extraction, and control the final temperature of vanadium extraction semi-steel to 1420°C;

[0035] S2: tap the steel, inject nitrogen from the spray gun, and adjust the injection pressure of nitrogen to 1.0MPa, first use the nitrogen spray gun to spray passivated lime powder, lightly burned dolomite powder and aluminum-manganese alloy deoxidizer (40% aluminum, 35% manganese) %, the unavoidable impurity content is not more than 3%, and the balance is iron), and then continue to spray passivated lime powder and light-burned dolomite powder separately, and the injection amount of aluminum-manganese alloy deoxidizer is 1kg / ton of steel The blowing time is 5 minutes, the injection amount of passivated lime powder is 4kg / ton of steel, the injection amoun...

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PUM

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Abstract

The invention relates to the technical field of metallurgy, and particularly discloses a method for inhibiting generation of vanadium extraction semi-steel smoke dust. The method for inhibiting the generation of the vanadium extraction semi-steel smoke dust comprises the following steps of: feeding vanadium-containing molten iron into a vanadium extraction converter for vanadium extraction, and controlling the final temperature of vanadium extraction semi-steel to be 1340-1420 DEG C; and conducting steel tapping, wherein after a slagging agent and an alloy deoxidizing agent are compositely blown by using nitrogen for a first preset time, the slagging agent is independently blown for a second preset time, so that the formed pre-melted slag covers the surface of the semi-steel. According tothe method for inhibiting the generation of the vanadium extraction semi-steel smoke dust, while the deoxidation effect is achieved, the formed pre-molten slag floats upwards and completely covers thesurface of the semi-steel, to isolate contact between the semi-steel and air, so that the effect of inhibiting smoke dust is achieved, secondary oxidation of the semi-steel is avoided, and the cleanliness of the semi-steel is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for suppressing the generation of soot from vanadium-extracted semi-steel. Background technique [0002] The vanadium-containing molten iron needs to extract the vanadium slag through the oxygen supply operation of the vanadium extracting converter, and the semi-steel produced is used for steelmaking to realize the dual process. Since the temperature of semi-steel is 1340-1420°C, which is higher than that of ordinary molten iron, it is easier to contact with air to produce more smoke and dust than ordinary molten iron, and there will also be some free oxygen in semi-steel after vanadium extraction, and these free oxygen and semi-steel The carbon in the steel reacts to produce CO gas, causing the semi-steel to tumble violently and generate a lot of smoke. The above process will not only cause molten steel to splash and pollute the environment, but also affect the clea...

Claims

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Application Information

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IPC IPC(8): C21C5/36C21C7/06C21C7/00
CPCC21C5/36C21C7/06C21C7/0006C21C7/0037C21C7/0087
Inventor 郑力飞李亚厚孙宏光苏克文曹斌魏自明
Owner HEBEI IRON AND STEEL