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Converter ladder bottom blowing co 2 Method for extracting vanadium

A converter and ladder technology is applied in the field of vanadium metallurgy, which can solve the problems of incomplete melting, fast rhythm, and quenching phenomenon in the molten pool, and achieve the effect of inhibiting the heating of the molten pool and reducing the residual vanadium content.

Active Publication Date: 2022-08-05
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Converter ladder bottom blowing co <sub>2</sub> Method for extracting vanadium

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The molten iron with a V content of 0.28-0.34% is mixed into the converter, and the temperature of the molten iron is controlled to be 1260-1320 ° C. The air-permeable bricks are distributed in the bottom zone I, II and III of the converter. The number of permeable bricks matches the furnace capacity, of which zone I The ventilation bricks in zone III are symmetrically distributed, the ventilation bricks in zone II are symmetrically distributed, and the included angle α in zone II is 80°. Blow CO at the bottom of the converter after shaking the furnace 2 , among which, CO is blown from the bottom of a single breathable brick in Zone I 2 Flow is 100Nm 3 / min, CO is blown from the bottom of a single breathable brick in the Ⅱ zone 2 Flow is 140Nm 3 / min, CO is blown from the bottom of a single breathable brick in zone III 2 Flow is 180Nm 3 / min, at the same time, the top of the oxygen lance is used to blow O 2 , the oxygen supply intensity of the oxygen lance is 1.5~...

Embodiment 2

[0026] The molten iron with a V content of 0.28-0.34% is mixed into the converter, and the temperature of the molten iron is controlled to be 1260-1320 ° C. The air-permeable bricks are distributed in the bottom zone I, II and III of the converter. The number of permeable bricks matches the furnace capacity, of which zone I The ventilation bricks in zone III are symmetrically distributed, the ventilation bricks in zone II are symmetrically distributed, and the included angle α of zone II is 90°. Blow CO at the bottom of the converter after shaking the furnace 2 , among which, CO is blown from the bottom of a single breathable brick in Zone I 2 Flow is 120Nm 3 / min, CO is blown from the bottom of a single breathable brick in the Ⅱ zone 2 Flow is 160Nm 3 / min, CO is blown from the bottom of a single breathable brick in zone III 2 Flow is 200Nm 3 / min, at the same time, the top of the oxygen lance is used to blow O 2 , the oxygen supply intensity of the oxygen lance is 1.5~...

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Abstract

The invention belongs to the metallurgical technical field of vanadium, in particular to the step bottom blowing of CO in a converter 2 The method of vanadium extraction. The technical problem to be solved by the present invention is to provide a step bottom blowing CO in a converter 2 The method for extracting vanadium reduces the residual vanadium content. The converter step bottom blowing CO provided by the invention 2 The method for extracting vanadium comprises the following steps: mixing vanadium-containing molten iron into a converter, and after shaking the furnace, the bottom of the converter is blown with CO 2 , while using an oxygen lance to blow O 2 , Add the coolant within 2min of the oxygen lance opening and blowing, and blow to the end point. The present invention recovers the carbon dioxide gas discharged from iron and steel production, and is used for vanadium extraction in the converter, which can achieve the effect of energy saving and emission reduction; at the same time, the present invention adopts CO 2 Substitute part O 2 or N 2 Extracting vanadium in a converter can restrain the temperature rise of the molten pool, which is beneficial to extracting vanadium and protecting carbon, and can also effectively reduce the residual vanadium content.

Description

technical field [0001] The invention belongs to the metallurgical technical field of vanadium, in particular to the step bottom blowing of CO in a converter 2 The method of vanadium extraction. 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%. With global warming and environmental problems becoming more and more serious, reducing CO 2 Emissions are getting more and more attention. Steel industry CO 2 Gas emissions accounted for 6%, ranking fourth, putting the CO generated by steel companies 2 It can be recycled and applied to steelmaking, which 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 lot of heat, causing the temperature of the molten pool to quickly rise to above 1400 °C, exceeding the transition temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C7/072C22B34/22
CPCY02P10/20
Inventor 李龙王建
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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