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A method for dephosphorizing and preserving vanadium in vanadium-containing phosphorus hot metal

A technology of molten iron, vanadium and phosphorus, applied in the field of metallurgy, can solve problems not involved, and achieve the effect of comprehensive utilization and reduction of smelting process

Active Publication Date: 2022-03-22
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above patents involve CO 2 dephosphorization process, but does not involve the use of CO 2 A method for direct smelting of vanadium steel by simultaneously dephosphorizing hot metal containing vanadium and phosphorus while preserving vanadium by means of injection

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] A method for dephosphorizing and preserving vanadium in vanadium-containing phosphorus hot metal, the specific operation steps are as follows:

[0026] (1) Drain the vanadium-containing phosphorus molten iron after desulfurization into the induction furnace, and the temperature of the vanadium-containing molten iron in the induction furnace is maintained at 1400 ° C;

[0027] (2) Put in the dephosphorization slag, and at the same time inject CO in the way of top blowing 2 gas; among them, CO 2 The injection rate is 5.0Nm 3 / t 铁水 min, the injection time is 10min;

[0028] (3) When the phosphorus content in vanadium-containing phosphorus iron water drops below 0.025%, stop injecting CO 2 , 93% of the vanadium in the raw material remains in the metal melt. After blowing, the gold slag separation process is performed, and the metal melt is directly used for vanadium steel smelting. CO 2 The CO gas generated by dephosphorization is returned to the iron and steel smelti...

Embodiment 2

[0030] A method for dephosphorizing and preserving vanadium in vanadium-containing phosphorus hot metal, the specific operation steps are as follows:

[0031] (1) Drain the vanadium-containing phosphorus molten iron after desulfurization into the induction furnace, and the temperature of the vanadium-containing molten iron in the induction furnace is maintained at 1450° C.;

[0032] (2) Put in the dephosphorization slag, and at the same time inject CO in the way of bottom blowing 2 gas; among them, CO 2 The injection rate is 0.50Nm 3 / t 铁水 Min, the injection time is 60min;

[0033] (3) When the phosphorus content in the vanadium-containing phosphorus iron water drops below 0.03%, stop injecting CO 2 , 96% of the vanadium in the raw material remains in the metal melt. After blowing, the gold slag separation process is performed, and the metal melt is directly used for vanadium steel smelting. CO 2 The CO gas generated by dephosphorization is returned to the iron and steel...

Embodiment 3

[0035] A method for dephosphorizing and preserving vanadium in vanadium-containing phosphorus hot metal, the specific operation steps are as follows:

[0036] (1) Drain the vanadium-containing phosphorus molten iron after desulfurization into the induction furnace, and the temperature of the vanadium-containing molten iron in the induction furnace is maintained at 1450° C.;

[0037] (2) Put in the dephosphorization slag, and at the same time inject CO in the way of top and bottom blowing 2 gas; among them, CO 2 The injection rate is 2.0Nm 3 / t 铁水 min, the injection time is 30min;

[0038] (3) When the phosphorus content in vanadium-containing phosphorus iron water drops below 0.01%, stop injecting CO 2 , 91% of the vanadium in the raw material remains in the metal melt. After blowing, the gold slag separation process is performed, and the metal melt is directly used for vanadium steel smelting. CO 2 The CO gas generated by dephosphorization is returned to the iron and st...

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PUM

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Abstract

A method for dephosphorizing and preserving vanadium in vanadium-phosphorus molten iron, mainly comprising the following steps: (1) draining vanadium-containing and phosphorus-containing molten iron produced in a blast furnace or non-blast furnace into an induction furnace; Phosphorus slag and CO injection 2 , top blowing, bottom blowing, side blowing or top-bottom re-blowing can be used; (3) When the phosphorus content in the vanadium-phosphorous iron water drops below 0.03%, the blowing is stopped and the slag is separated from the molten iron. After the molten iron containing vanadium and phosphorus is treated by the method of the invention, when the phosphorus content is reduced to the requirement of vanadium steel, the loss rate of vanadium in the molten iron is less than 10%, achieving the effect of dephosphorization and vanadium preservation. In the present invention, by injecting CO 2 Realized the selective oxidation of molten iron containing vanadium and phosphorus and CO 2 The utilization of resources reduces the smelting process of vanadium steel.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for dephosphorizing and preserving vanadium in molten iron containing vanadium. Background technique [0002] Metal vanadium is widely used in the field of steel, and more than 85% of vanadium products are used in steel production. For the developed vanadium steel smelting process, no matter what alloying method is used, it is within the framework of oxygen extraction of vanadium. It is necessary to oxidize vanadium into slag first, and then use vanadium slag, V 2 o 5 Or adding ferro-vanadium to the vanadium-extracted semi-steel, the whole smelting process is long, the energy consumption is large, and the utilization rate and recovery rate of vanadium are low. [0003] At present, the dephosphorization process follows the principle of "three highs and one low", that is, high alkalinity, high oxidation, high slag content, and low temperature. The traditional conver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
CPCC21C7/064C21C7/0645Y02P10/20
Inventor 张廷安豆志河吕国志杨翰刘燕赵秋月张子木张伟光傅大学
Owner NORTHEASTERN UNIV LIAONING
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