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A method for promoting the extraction of vanadium and preserving carbon by using CO

A technology of strength and content, applied in the direction of manufacturing converters, etc., can solve the problems of affecting the blowing time, poor kinetic conditions of the molten pool reaction, affecting the recovery rate of vanadium, etc.

Active Publication Date: 2021-11-23
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characteristics of the vanadium extraction process determine that the reaction of the molten pool is not violent, the temperature in the furnace is low, and the carbon-oxygen reaction is suppressed. At the same time, because the content of vanadium in the molten iron is only about 0.3%, the reaction speed and degree of vanadium in the process of vanadium extraction are limited. mass transfer rate limit
The mass transfer of vanadium between the reaction interfaces becomes a limiting link, which not only affects the blowing time, but also affects the recovery rate of vanadium
Poor reaction kinetics conditions in molten pool lead to high TFe content in semi-steel residual vanadium and slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] 50 tons of vanadium extraction converter smelting process

[0065] In the process of vanadium extraction and smelting in the converter, CO is blown into the converter in the form of gas. The total strength of bottom blowing is 0.04-0.1Nm 3 / (min·t), the total strength of side blowing is 0.01-0.05Nm 3 / (min t).

[0066] When CO is blown in from the bottom using a bottom blowing element, it specifically includes the following steps:

[0067] In the early stage of smelting: the oxidation of Si, Ti, and Mn is the main one, the oxidation reaction of C is weak, and the poor stirring ability of the molten pool is not conducive to the reaction. Therefore, high-intensity injection of N 2 , to strengthen the stirring of the molten pool and promote the reaction; N 2 Bottom blow strength is 0.08-0.1Nm 3 / (min·t);

[0068] In the middle stage of smelting: Si, Ti, and Mn have been basically oxidized completely, and the oxidation reaction of V is the main one. In order to preven...

Embodiment 2

[0076] 200 tons of vanadium extraction converter smelting process

[0077] In the process of vanadium extraction and smelting in the converter, CO is blown into the converter in the form of gas. The total strength of bottom blowing is 0.1-0.25Nm 3 / (min·t), the total strength of side blowing is 0.05-0.1Nm 3 / (min t).

[0078] When CO is blown in from the bottom using a bottom blowing element, it specifically includes the following steps:

[0079] In the early stage of smelting: the oxidation of Si, Ti, and Mn is the main one, the oxidation reaction of C is weak, and the poor stirring ability of the molten pool is not conducive to the reaction. Therefore, high-intensity injection of N2 , to strengthen the stirring of the molten pool and promote the reaction; N 2 Bottom blowing strength is 0.15-0.25Nm 3 / (min·t);

[0080] In the middle stage of smelting: Si, Ti, and Mn have been basically oxidized completely, and the oxidation reaction of V is the main one. In order to prev...

Embodiment 3

[0088] 400 tons of vanadium extraction converter smelting process

[0089] In the process of vanadium extraction and smelting in the converter, CO is blown into the converter in the form of gas. The total strength of bottom blowing is 0.25-0.4Nm 3 / (min·t), the total strength of side blowing is 0.1-0.15Nm 3 / (min t).

[0090] When CO is blown in from the bottom using a bottom blowing element, it specifically includes the following steps:

[0091] In the early stage of smelting: the oxidation of Si, Ti, and Mn is the main one, the oxidation reaction of C is weak, and the poor stirring ability of the molten pool is not conducive to the reaction. Therefore, high-intensity injection of N 2 , to strengthen the stirring of the molten pool and promote the reaction; N 2 Bottom blow strength is 0.3-0.4Nm 3 / (min t);

[0092] In the middle stage of smelting: Si, Ti, and Mn have been basically oxidized completely, and the oxidation reaction of V is the main one. In order to prevent...

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Abstract

The invention belongs to the technical field of metallurgy, and relates to a method for promoting vanadium extraction and carbon conservation by utilizing CO. In the smelting stage of a 30-400-ton vanadium extraction converter, a furnace gas analyzer is used to monitor the CO content change in the furnace gas in real time, and according to the CO content change Divide the smelting process into three stages: early smelting, middle smelting and late smelting; according to the change of CO content in different smelting periods, dynamically adjust the CO gas supply, increase the partial pressure of CO gas in the furnace, suppress the oxidation of carbon, and use CO Bubbles stir the molten pool. The invention utilizes CO to increase the oxidation conversion rate of vanadium in a converter to reduce residual vanadium in semi-steel and improve the grade of vanadium slag, thereby realizing the method of extracting vanadium and preserving carbon.

Description

technical field [0001] The invention belongs to the field of metallurgical technology, and in particular relates to a method for promoting vanadium extraction and carbon conservation by utilizing CO. Background technique [0002] Converter vanadium extraction is a selective oxidation reaction process of Fe, Si, Ti, Mn, V, C, and other elements in molten iron. At present, my country mainly adopts the oxygen converter vanadium extraction process, and the oxygen converter vanadium extraction process mainly uses oxygen to form vanadium oxides and enter the slag. [0003] From a thermodynamic point of view, since the oxidation reactions of Si, Ti, and Mn all generate a large amount of heat, the temperature of the molten pool in the process of vanadium extraction in the converter rises quickly to above 1400°C, which leads to premature oxidation of carbon, inhibits the oxidation of vanadium, and leads to residual Vanadium is higher. At present, the temperature control of the vana...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21C5/30
CPCC21C5/30C21C5/36
Inventor 吕明李航薛魁谢堃邢相栋张朝晖
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY