Method for removing carbon in vanadium-containing molten iron by injection of CO2 or limestone

Abstract

The invention relates to a method for removing carbon in vanadium-containing molten iron by injection of CO2 or limestone. The method comprises a step (1) of leading the vanadium-containing molten iron into an induction furnace, and guaranteeing that the temperature of the vanadium-containing molten iron is larger than or equal to 1450 DEG C; a step (2) of stirring the vanadium-containing molten iron to form a vortex; a step (3) of blowing CO2 or limestone powder into the vortex, wherein according to the mole ratio, the injection amount of CO2 or limestone powder is 1.2-1.5 times element C in the vanadium-containing molten iron and the injection time is 30-60 min; continuing to perform eccentric stirring, and obtaining the carbon-removed vanadium-containing molten iron and molten slag, and collecting generated CO and unreacted CO2; a step (4) of causing CO to generate CO2 through aftertreatment, and recycling CO2; and separating the vanadium-containing molten iron and the molten slag. According to the method, by injection of CO2 or limestone, carbon removal is performed, the carbon does not react with V in the vanadium-containing molten iron, and the goal of reducing carbon and protecting vanadium is achieved. The carbon-removed vanadium-containing molten iron can be directly used for smelting vandium steel, the vandium steel smelting production cycle is greatly shortened, the vandium utilization rate is improved, and the method has good economic and social benefits.

Description

Technical field: [0001] The invention belongs to the technical field of metallurgy, in particular to a CO injection 2 Or the method of removing carbon from vanadium-containing iron water by limestone. Background technique: [0002] Vanadium is a metal element with a large content in nature but is very dispersed. It often exists in minerals in the form of admixture in a dispersed state. Belongs to rare metal elements. The world is rich in vanadium resources, but there are few rich ores that can be mined alone, usually associated with other ores with low grades, and concentrated in China, South Africa, Russia and other countries. Vanadium-chin magnetite is the main mineral resource of vanadium. There are rich vanadium-chin magnetite in Panzhihua, Sichuan and Chengde, Hebei, which are one of the largest concentration areas of vanadium resources in the world. [0003] About 80% of the world's vanadium is used in the steel industry. In iron and steel production, vanadium is m...

AI Technical Summary

Problems solved by technology

This method still needs to smelt ferrovanadium, and the vanadium slag recovery process is easy to cause the loss of vanadium

[0006] The traditional oxygen blowing decarburization method will cause V in vanadium-containing iron water to be oxidized before C and enter the slag, which makes the smelting process of vanadium steel complicated

In view of the shortcomings of the traditional vanadium steel smelting process, such as long process, complex iron vanadium smelting, high energy consumption, and large environmental pollution

Images