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A top-blown oxygen lance, a vanadium-extracting top-bottom double-blowing method, and a vanadium-extracting smelting method

A smelting method and top-blowing oxygen lance technology are applied in the field of vanadium-extracting top-bottom re-blowing method and vanadium-extracting smelting, top-blowing oxygen lance, and can solve the problem of low oxidation rate of vanadium in molten iron, high residual vanadium content in semi-steel, and metallic iron. The problem of high content, to achieve the effect of improving oxidation efficiency, improving fluidity, and improving oxidation rate

Active Publication Date: 2022-03-29
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the oxidation rate of molten vanadium in the blowing process of vanadium extraction process is not high, and the melting point of vanadium slag formed is high, and its fluidity is not good.
This not only causes the residual vanadium content in the semi-steel to be higher, but fluctuates greatly, and the average residual vanadium is greater than 0.037%; makes the metal iron content in the vanadium slag higher, and fluctuates greatly, and the metal iron in the slag averages 23- 30%

Method used

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  • A top-blown oxygen lance, a vanadium-extracting top-bottom double-blowing method, and a vanadium-extracting smelting method
  • A top-blown oxygen lance, a vanadium-extracting top-bottom double-blowing method, and a vanadium-extracting smelting method
  • A top-blown oxygen lance, a vanadium-extracting top-bottom double-blowing method, and a vanadium-extracting smelting method

Examples

Experimental program
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Effect test

Embodiment 1

[0082] This implementation involves a top-blown oxygen lance, a vanadium-extracting top-bottom double-blowing method, and a vanadium-extracting smelting method:

[0083] The mass percentage of the chemical composition of the vanadium-containing molten iron: C 4.11%, Si 0.23%, Mn 0.19%, P 0.11%, S 0.10%, Ti 0.11%, V 0.31%. A porous oxygen lance is adopted, which has an oxygen lance structure with three main injection holes and three auxiliary holes, and its structural schematic diagram is shown in Figure 2. The main hole of the oxygen lance has 3 holes with a diameter of 40mm and a Mach number of 2.01. Around the main hole are arranged 3 auxiliary holes with a diameter of 8mm and a Mach number of 1.

[0084] Vanadium extraction top and bottom blowing method: 0-120 seconds, the oxygen flow rate is controlled at 2.2Nm 3 / min, the position of the oxygen lance is 0.85m, and the flow rate of the bottom blowing is 0.03Nm 3 / min; 121-260 seconds, the oxygen flow rate is 1.5Nm 3 / mi...

Embodiment 2

[0088] This implementation involves a top-blown oxygen lance, a vanadium-extracting top-bottom double-blowing method, and a vanadium-extracting smelting method:

[0089] The chemical composition of vanadium-containing molten iron is calculated by mass percentage: C 4.15%, Si 0.26%, Mn 0.21%, P 0.12%, S 0.11%, Ti 0.12%, V 0.33%. A porous oxygen lance is adopted, with an oxygen lance structure of three main nozzle holes and six auxiliary holes, and its structural schematic diagram is shown in Fig. 3 . The main hole of the oxygen lance has 3 holes with a diameter of 45mm and a Mach number of 1.99. Around the main hole are arranged 6 auxiliary holes with a diameter of 10mm and a Mach number of 1.

[0090] Vanadium extraction top and bottom blowing method: 0-120 seconds, the oxygen flow rate is controlled at 2.3Nm 3 / min, the position of the oxygen lance is 0.9m, and the flow rate of the bottom blowing is 0.04Nm 3 / min; 121-260 seconds, the oxygen flow rate is 1.9Nm 3 / min, oxyg...

Embodiment 3

[0094] This implementation involves a top-blown oxygen lance, a vanadium-extracting top-bottom double-blowing method, and a vanadium-extracting smelting method:

[0095] The chemical composition of vanadium-containing molten iron is calculated by mass percentage: C 4.14%, Si 0.24%, Mn 0.19%, P 0.10%, S 0.11%, Ti 0.13%, V 0.33%. A porous oxygen lance is adopted, which has an oxygen lance structure with four main nozzle holes and four auxiliary holes, and its structural schematic diagram is shown in Figure 4. The main hole of the oxygen lance has 4 holes with a diameter of 50 mm and a Mach number of 1.99. Around the main hole are arranged 4 auxiliary holes with a diameter of 12 mm and a Mach number of 1.

[0096] Vanadium extraction top and bottom blowing method: 0-120 seconds, the oxygen flow rate is controlled at 2.5Nm 3 / min, the position of the oxygen lance is 0.8m, and the flow rate of the bottom blowing is 0.04Nm 3 / min; 121-260 seconds, the oxygen flow rate is 1.2Nm 3 ...

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Abstract

The invention relates to a top-blown oxygen lance, a top-bottom double blowing method for extracting vanadium and a smelting method for extracting vanadium, belonging to the technical field of vanadium-titanium magnetite smelting, and solving the problem of low vanadium oxidation rate and vanadium in the vanadium extracting converter in the prior art. Poor slag fluidity and high metallic iron content in slag. The top-blown oxygen lance involved in the present invention has n main holes, which are evenly distributed, and m auxiliary holes, which are located on the surface where the main holes are located, and are evenly distributed between adjacent main holes, n=3‑6, m= n or 2n. The high oxidation rate of vanadium in the vanadium extraction converter and the effective control of the metal content in the slag are realized.

Description

technical field [0001] The invention relates to the technical field of vanadium-titanium-magnetite smelting, in particular to a top-blown oxygen lance, a vanadium-extracting top-bottom double-blowing method, and a vanadium-extracting smelting method. Background technique [0002] In the vanadium extraction process of the converter, the vanadium-containing molten iron is mixed into the converter, and the vanadium-containing molten iron is stirred by a high-speed oxygen jet, and silicon, vanadium, manganese, titanium, iron and other elements in the molten iron are oxidized into stable oxides to form vanadium oxides Combined vanadium slag. It is an important method widely used in many vanadium extraction processes from molten iron, including single-slag method, double-slag method and double-combined method. The single slag method and the double slag method extract vanadium and make steel in the same converter. The vanadium extraction slag of the former is mixed with the steel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C5/46C21C7/00C22B34/22
CPCC21C5/35C21C5/4606C21C7/0006C22B34/22
Inventor 吴伟徐瑜肖峰赵进宣冉顶立崔怀周高琦李相臣赵博
Owner CENT IRON & STEEL RES INST
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