Method for extracting vanadium by bottom blowing of CO2 at converter

A converter bottom blowing and CO2 technology, which is applied in the field of vanadium metallurgy, can solve the problems of incomplete melting, fast rhythm, block coolant can not continuously control the temperature of the molten pool, etc., and achieve the goal of reducing the content of residual vanadium and suppressing the temperature rise of the molten pool Effect

Active Publication Date: 2021-03-19
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
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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 by bottom blowing of CO2 at converter

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Embodiment 1

[0027] 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 air-permeable bricks in zone III are symmetrically distributed, and the air-permeable bricks in zone II are symmetrically distributed, and the included angle α in zone II is 80°. Blowing CO at the bottom of the converter 2 , blowing CO at the bottom of a single ventilating brick in Zone I 2 The flow rate is 170Nm 3 / min, blowing CO at the bottom of a single ventilating brick in Zone II 2 The flow rate is 100Nm 3 / min, blowing CO at the bottom of a single ventilating brick in Zone III 2 Flow 170Nm 3 / min, after 4 minutes of blowing, use an oxygen lance to blow O 2 +CO 2 Mixed gas, CO 2 The volume content is 12%, and the oxygen supply intensity is 1.5-3.0Nm ...

Embodiment 2

[0029] 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 air-permeable bricks in zone III are symmetrically distributed, and the air-permeable bricks in zone II are symmetrically distributed, and the included angle α in zone II is 100°. Blowing CO at the bottom of the converter2 , blowing CO at the bottom of a single ventilating brick in Zone I 2 The flow rate is 200Nm 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 Flow 200Nm 3 / min, after 4 minutes of blowing, use an oxygen lance to blow O 2 +CO 2 Mixed gas, CO 2 The volume content is 25%, and the oxygen supply intensity is 1.5-3.0Nm ...

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Abstract

The invention belongs to the metallurgical technical field of vanadium, and particularly relates to a method for extracting vanadium by bottom blowing of CO2 at a converter. In order to solve the technical problem, the invention provides the method for extracting vanadium by bottom blowing of CO2 at the converter. The method for extracting vanadium by bottom blowing of CO2 at the converter comprises the following steps: mixing vanadium-containing molten iron into the converter, starting to blow CO2 at the bottom of the converter, adopting an oxygen lance to perform top blowing of a gas mixtureof O2 and CO2, adding a refrigerant 2 minutes within blowing of the oxygen lance, and blowing to the final point. The method can recycle carbon dioxide gas discharged by steel production, is used forextracting vanadium at the converter, and can achieve the effects of saving energy and reducing consumption; CO2 is adopted to replace part of O2 or N2 for extracting vanadium at the converter, so that a molten pool can be prevented from heating up, and thus, the effect of extracting vanadium to hold carbon is facilitated, and content of residual vanadium further can be effectively reduced.

Description

technical field [0001] The invention belongs to the metallurgical technical field of vanadium, in particular to converter bottom blowing CO 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 molten pool...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/35C21C7/072C22B34/22
CPCC21C5/28C21C5/35C21C7/072C22B34/22Y02P10/20
Inventor 李龙吴国荣
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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