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Method and system for producing vanadium-rich slag and low-vanadium alloy by low-vanadium alloy and aod dual-combination

A technology of vanadium alloy and vanadium slag, which is applied in the field of metal smelting, can solve the problems of inability to directly use downstream iron and steel users, low content of vanadium in pig iron, high content of carbon and phosphorus, etc., achieve good application prospects and promotion significance, moderate vanadium content, production low cost effect

Active Publication Date: 2021-09-17
BERIS ENG & RES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of vanadium in the pig iron is still very low, and the content of carbon and phosphorus is high, so it cannot be directly used by downstream steel users and needs to be processed

Method used

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  • Method and system for producing vanadium-rich slag and low-vanadium alloy by low-vanadium alloy and aod dual-combination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Pour the vanadium-containing molten iron produced by a submerged arc furnace into the AOD furnace, and after adding 4.5% vanadium sintered ore (sintered from vanadium-containing steel slag, vanadium powder ore, dust, etc.), carry out top-blown oxygen (0.6MPa , ), while blowing nitrogen at the bottom (0.25MPa, ), to enrich vanadium into the slag. After blowing for 8 minutes, lift the oxygen lance to turn off the oxygen, continue blowing nitrogen for 15 seconds, and then adjust the nitrogen to 0.08MPa, Then pour into the ladle, scrape the slag into the slag pan, the vanadium-rich slag includes SiO 2 35.11%, CaO 8.93%, V 2 o 5 13.43%, FeO 30.76%.

[0080] Then pour the molten iron into another AOD furnace, add lime to make slag, and blow oxygen at the top for 12 minutes (0.6MPa, ), at the same time, blow the mixed gas of nitrogen and oxygen on the side for 6.5min (0.6MPa, Wherein, the ratio of nitrogen to oxygen is 1 / 5), and then the side blowing gas is cha...

Embodiment 2

[0082] Pour the vanadium-containing molten iron produced by a submerged arc furnace into the AOD furnace, and after adding 4% vanadium-titanium magnetite ore, carry out top-blown oxygen (0.65MPa, ), while blowing nitrogen at the bottom (0.2MPa, ), to enrich vanadium into the slag. After blowing for 10 minutes, raise the oxygen lance to turn off the oxygen, continue blowing nitrogen for 15 seconds, then adjust the nitrogen to 0.05MPa, Then pour into the ladle, scrape the slag into the slag pan, the vanadium-rich slag includes SiO 2 33.11%, CaO 0.09%, V 2 o 5 14.69%, FeO 39.46%.

[0083] Then pour the molten iron into another AOD furnace, add lime to make slag, and blow oxygen at the top for 12 minutes (0.65MPa, ), at the same time, blow the mixed gas of nitrogen and oxygen on the side for 8 minutes (0.65MPa, Among them, the ratio of nitrogen to oxygen is 1 / 3), and then the side blowing gas is changed to nitrogen (0.05MPa, ), and at the same time start blowing nitro...

Embodiment 3

[0085] Pour the vanadium-containing molten iron produced by a submerged arc furnace into the AOD furnace, and after adding 2.5% vanadium-titanium magnetite lump ore and 2.5% vanadium sintered ore (sintered from vanadium-containing steel slag, vanadium powder ore, dust removal ash, etc. ), carry out top blowing oxygen (0.6MPa, ), while blowing argon at the bottom (0.3MPa, ), to enrich vanadium into the slag. After blowing for 8 minutes, lift the oxygen lance to turn off the oxygen, continue blowing argon for 10 seconds, then adjust the argon to 0.1MPa, Then pour into the ladle, scrape the slag into the slag pan, the vanadium-rich slag includes SiO 2 32.82%, CaO 4.78%, V 2 o 5 13.41%, FeO 37.01%.

[0086] Then pour the molten iron into another AOD furnace, add lime to make slag, and blow oxygen at the top for 14min (0.6MPa, ), at the same time, blowing the mixed gas of argon and oxygen on the side for 9 minutes (0.6MPa, Among them, the ratio of argon to oxygen is 1...

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Abstract

The invention belongs to the field of metal smelting, and relates to a low-vanadium alloy and a method and a system for preparing vanadium-rich slag and low-vanadium alloy by using AOD dual-combination. The AOD duplex method for producing vanadium-rich slag and low-vanadium alloy comprises: (1) mixing molten iron into the first AOD furnace, blowing oxygen at the top, and feeding inert gas at the bottom, and simultaneously adding vanadium-containing ore for blowing; ( 2) After blowing is finished, oxygen blowing is stopped, and vanadium-rich slag is separated; (3) molten iron is poured into the second AOD furnace, slagging material is added, oxygen is blown at the top, and a mixture of inert gas and oxygen is blown into the side; (4) ) Oxygen blowing continues at the top, only inert gas is blown into the side, and inert gas is blown into the bottom at the same time; (5) After blowing is completed, oxygen blowing is stopped and steel is tapped. The invention enriches the vanadium into the slag through two AOD furnace refining, and finally obtains the vanadium-rich slag which can be sold and the low-vanadium alloy with reasonable carbon and phosphorus content, so that the resources are effectively utilized.

Description

technical field [0001] The invention belongs to the field of metal smelting, and relates to a low-vanadium alloy and a method and a system for preparing vanadium-rich slag and low-vanadium alloy by using AOD dual-combination. Background technique [0002] Vanadium can refine the structure and grain of steel, improve the hardness and wear resistance of steel, improve its tensile strength and heat resistance, etc., so it has been widely used in the steel industry. [0003] Vanadium-titanium magnetite is the main mineral resource of vanadium, and most of the vanadium is obtained from it at present. In the steelmaking process of vanadium-titanium magnetite, a large amount of steel slag will be produced, which still contains about 1% to 4% V 2 o 5 has not been effectively utilized. [0004] The vanadium in the steel slag can be reduced to the molten iron through carbon-thermal smelting in a submerged arc furnace to obtain vanadium-containing pig iron. However, the content of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C22C35/00C22C33/06C22C38/12
CPCC21C7/00C21C7/0006C21C7/0087C21C2007/0093C22C33/06C22C35/005C22C38/002C22C38/12
Inventor 吕韬李秦灿于洪翔宁晓宇陈圣鹏陈文国
Owner BERIS ENG & RES CORP