Method for extracting vanadium through asymmetric bottom blowing of CO2 in converter

An asymmetric, converter technology, applied in the field of vanadium metallurgy, can solve the problems of incomplete melting, fast rhythm, ineffective cooling effect, etc., and achieve the effect of reducing residual vanadium content and restraining the temperature of molten pool.

Active Publication Date: 2021-04-16
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, these block coolants cannot continuously control the temperature of the molten pool, and at the same time, the local molten pool is prone to rapid cooling. In addition, the process of vanadium extraction in the converter is fast, and the melting kinetic conditions of the block coolant are not sufficient, and the melting is not complete. Can not be used effectively, not conducive to vanadium extraction

Method used

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  • Method for extracting vanadium through asymmetric bottom blowing of CO2 in converter

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Effect test

Embodiment 1

[0023] Mix molten iron with a V content of 0.28-0.34% into the converter, control the temperature of the molten iron at 1260-1320 °C, and distribute the breathable bricks in the zone I, zone II and zone III of the bottom of the converter. The number of breathable bricks matches the furnace capacity, and zone I , The breathable bricks in zone III are distributed symmetrically, the breathable bricks in zone II are distributed asymmetrically, and the included angle α in zone II is 80°. After shaking the furnace, blow CO at the bottom of the converter 2 , in which, CO 2 The flow rate is 100Nm 3 / min, blowing CO at the bottom of a single ventilating brick in Zone II 2 The flow rate is 130Nm 3 / min, blowing CO at the bottom of a single ventilating brick in Zone III 2 The flow rate is 160Nm 3 / min, while blowing O with an oxygen lance 2 , Oxygen supply strength of oxygen lance 1.5~3.0Nm 3 / min·t iron, lance position control 1.7~2.0m, add 20~27kg / t iron coolant within 2 minutes...

Embodiment 2

[0025] Mix molten iron with a V content of 0.28-0.34% into the converter, control the temperature of the molten iron at 1260-1320 °C, and distribute the breathable bricks in the zone I, zone II and zone III of the bottom of the converter. The number of breathable bricks matches the furnace capacity, and zone I 1. The breathable bricks in zone III are distributed symmetrically, and the breathable bricks in zone II are distributed asymmetrically, and the included angle α in zone II is 100°. After shaking the furnace, blow CO at the bottom of the converter 2 , in which, CO 2 The flow rate is 120Nm 3 / min, blowing CO at the bottom of a single ventilating brick in Zone II 2 The flow rate is 150Nm 3 / min, blowing CO at the bottom of a single ventilating brick in Zone III 2 The flow rate is 180Nm 3 / min, while blowing O with an oxygen lance 2 , Oxygen supply strength of oxygen lance 1.5~3.0Nm 3 / min·t iron, lance position control 1.7~2.0m, add 20~27kg / t iron coolant within 2 m...

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Abstract

The invention belongs to the technical field of vanadium metallurgy, and particularly relates to a method for extracting vanadium through asymmetric bottom blowing of CO2 in a converter. The technical problem to be solved by the invention is to provide the method for extracting the vanadium through asymmetric bottom blowing of the CO2 in the converter, so that the content of residual vanadium is reduced. The method for extracting the vanadium through asymmetric bottom blowing of the CO2 in the converter comprises the following steps that vanadium-containing molten iron is mixed into the converter, the CO2 is blown to the bottom of the converter after the converter is shaken, meanwhile, an oxygen lance is adopted for top blowing of O2, a cooling agent is added within 2 min of blowing of the oxygen lance, and blowing is conducted to the end point; and air bricks are laid at the bottom of the converter according to an area I, an area II and an area III, the air bricks in the area I and the area III are symmetrically distributed, the air bricks in the area II are asymmetrically distributed, and the included angle of the area II is 80-100 degrees. Carbon dioxide discharged in steel production is recycled and used for vanadium extraction of the converter, and the effects of energy conservation and emission reduction are achieved. The method provided by the invention can play a role in inhibiting the temperature rise of a molten pool, is beneficial to vanadium extraction and carbon retention, and can also effectively reduce the content of the residual vanadium.

Description

technical field [0001] The invention belongs to the technical field of vanadium metallurgy, in particular to asymmetric bottom-blown CO in converters 2 The method of extracting vanadium. Background technique [0002] CO 2 Is the main gas of the greenhouse effect, China's CO 2 Gas emissions are the largest, accounting for 25%. As global warming and environmental problems become more and more serious, reducing CO 2 emissions have drawn more and more attention. Steel Industry CO 2 Gas emissions accounted for 6%, ranking fourth, and the CO generated by steel enterprises 2 Recycled, used in steelmaking, can replace part of O 2 and Ar, creating economic benefits. [0003] In converter vanadium extraction process, O 2 Oxidation reaction with silicon, manganese, vanadium, titanium and some carbon elements generates a large amount of heat, causing the temperature of the molten pool to rise quickly above 1400 ° C, exceeding the transition temperature of C-V oxidation of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35C22B34/22
CPCY02P10/20
Inventor 李龙吴国荣
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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