Efficient and long-service-life blowing method and system of vanadium extraction-decarburization dual converter

A decarburization converter and converter technology, applied in the field of vanadium-containing molten iron steelmaking, can solve the problems of short life of oxygen lance, poor stirring of vanadium extracting converter, low vanadium oxidation rate, etc., and achieve the effect of reducing acquisition cost and low cost

Active Publication Date: 2019-01-18
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the above problems, the present invention combines CO 2 Based on the principles and effects applied in steelmaking, a high-efficiency and long-life injection method and system for vanadium extraction-decarburization dual converters are proposed. Converter gas produced by vanadium extraction converters and decarburization converters is used to obtain a variety of Purity range of CO 2 The gas is used for the injection of the vanadium extraction converter and the decarburization converter respectively, to increase the vanadium oxidation rate of the vanadium extraction converter, improve the dephosphorization effect of the decarburization converter, and at the same time increase the service life of the vanadium extraction converter and the decarburization converter. Solved the problems of poor vanadium extraction converter stirring, low vanadium oxidation rate, poor dephosphorization effect of decarburization converter, and short oxygen lance life in the vanadium extraction-decarburization converter dual process

Method used

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  • Efficient and long-service-life blowing method and system of vanadium extraction-decarburization dual converter
  • Efficient and long-service-life blowing method and system of vanadium extraction-decarburization dual converter
  • Efficient and long-service-life blowing method and system of vanadium extraction-decarburization dual converter

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Embodiment 1

[0060] In this embodiment, the method and system are applied in a 100-ton vanadium extraction-decarburization dual converter process.

[0061] The converter gas produced by the vanadium extraction converter contains 20% CO and 15% CO 2 , and the rest are N 2 , due to the low calorific value of the gas, before adopting the present invention, the vanadium extraction converter gas is directly released; the gas of the decarburization converter contains 60% CO and 20% CO 2 , and the rest are N 2 , are stored in the gas cabinet. Before adopting the present invention, the furnace bottom of the vanadium extracting converter was arranged with 8 bottom blowing air bricks, and the gas supply intensity was 0.04Nm 3 / t / min, two spray guns for injecting iron ore powder are arranged on the side of the furnace, and the gas supply intensity is 0.2Nm 3 / t / min, the powder spraying intensity is 1.0kg / t / min, the carrier gas of bottom blowing and side blowing are both N 2 ; The furnace bottom ...

Embodiment 2

[0072] In this embodiment, the method and system are applied in a 150-ton vanadium extraction-decarburization double converter process.

[0073] The converter gas produced by the vanadium extraction converter contains 30% CO and 20% CO 2 , and the rest are N 2 , due to the low calorific value of the gas, before adopting the present invention, the gas from the vanadium extraction converter is directly released; the gas from the decarburization converter contains 55% CO and 25% CO 2 , and the rest are N 2 , are stored in the gas cabinet. Before adopting the present invention, the furnace bottom of the vanadium extraction converter was arranged with 9 bottom-blowing air bricks, and the gas supply intensity was 0.09Nm 3 / t / min, 4 spray guns for injecting iron ore powder are arranged on the side of the furnace, and the gas supply intensity is 0.33Nm 3 / t / min, the powder spraying intensity is 2.0kg / t / min, the carrier gas of bottom blowing and side blowing are both N 2 ; The fur...

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Abstract

The invention discloses an efficient and long-service-life blowing method and system of a vanadium extraction-decarburization dual converter and belongs to the technical field of vanadium-containing liquid iron steelmaking. The efficient and long-service-life blowing method comprises the following steps: conducting vanadium extraction converter coal gas and decarburization converter coal gas intoan oxygen combustor; obtaining CO2-N2 mixed gas with first purity through the vanadium extraction converter coal gas; obtaining CO2-N2 mixed gas with second purity through the decarburization converter coal gas; btaining O2-CO2-N2 mixed gas through decarburization converter coal gas; obtaining CO2 gas with first purity through CO2-N2 with the second purity; carrying out vanadium extraction converter bottom blowing by utilizing the CO2-N2 mixed gas with the first purity; taking the CO2-N2 mixed gas with the second purity as iron ore powder carrier gas of vanadium extraction converter blowing; O2-CO2-N2 mixed gas and the CO2-N2 mixed gas with the first purity are used as lime powder carrier gas of the vanadium extraction converter bottom blowing and decarburization converter bottom spraying.By adopting the efficient and long-service-life blowing method, the vanadium oxidization rate of a vanadium extraction converter is improved and the dephosphorization effect of a decarburization converter is improved; the service life of the vanadium extraction converter and the decarburization converter is prolonged.

Description

technical field [0001] The invention belongs to the technical field of vanadium-containing molten iron steelmaking, and in particular relates to a method and system for high-efficiency and long-life injection of vanadium extraction-decarburization dual converters. Background technique [0002] In order to recover vanadium in vanadium-containing hot metal, the double-coupling process of vanadium extraction-decarburization converter is usually adopted at home and abroad. Take the vanadium slag, and the vanadium slag obtained from the vanadium extraction converter is used to produce vanadium compounds; and the semi-steel molten steel that has been treated with vanadium extraction is mixed into the decarburization converter for dephosphorization, decarburization and heating treatment to obtain qualified molten steel for use in Normal steelmaking production. The vanadium extraction-decarburization double converter steelmaking process can not only recover vanadium in vanadium-con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/35C21C5/38C21C5/46C01B13/16
CPCC01B13/16C21C5/28C21C5/35C21C5/38C21C5/46B01D53/62B01D53/83B01D2251/404B01D2257/504B01D2258/025B01D2258/0283C21C5/285C21C5/40Y02P10/146Y02P10/25Y02C20/40B01D53/38B01D53/76C01G31/02C21C5/30C21C5/36
Inventor 朱荣胡绍岩董凯马浩冉李伟峰周赟李志辉武文合韩宝臣冯超苏荣芳
Owner UNIV OF SCI & TECH BEIJING
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