Method for preparing ferro-titantium, steel and ferrovanadium from vanadium-titantium iron headings

Abstract

This invention provides a method for manufacturing FeTi, steel and FeV with FeVTi mineral concentrate including the following steps: 1, adding alkali metal to recover FeTiV mineral concentrate, 2, smelting and separating recovered Fe, 3, dephosphorizing of iron melt containing V, 4, entering into the steel converter to blow V melting and casting, 5, melting iron melt containing V with steel slag to air-refine V-rich slag with oxygen, 6, melting FeV with the V-rich slag, 7, smelting FeTi by melting slag. The advantages are: 1, avoiding the shortcoming of not recovering Ti in the converter and single-slag return flow and avoiding the shortcoming of low recovery rate of Fe in the Fe first and V second flow, 2, turning slag into the raw material of cement by adjusting composition of the smelted solvent, 3, avoiding complicated V-extraction composition of the technology by immersion.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for preparing ferro-titanium, steel and ferro-vanadium from ferro-vanadium-titanium concentrate. Background technique [0002] The utilization of vanadium-titanium iron ore concentrate, the methods currently adopted mainly include: [0003] 1. Blast furnace-converter process. The process uses an ordinary blast furnace to smelt molten iron containing 0.4% V under the conditions of large air volume, high humidity and acidic slag, and then uses a top-blown converter to oxidize the V in the molten iron to V 2 o 5 The content is 14% vanadium slag, and the obtained semi-steel is made with another converter, and the vanadium slag is extracted by water method to produce V with a content > 99%. 2 o 5 , and then the V 2 o 5 Smelted into ferrovanadium. [0004] 2. Process of vanadium first and then iron. The process uses a rotary kiln to sodiumize and roast the vanadium-titaniu...

AI Technical Summary

Problems solved by technology

[0009] The disadvantages of the first type of blast furnace-converter process mainly include: (1) The vanadium-titanium iron concentrate contains 12% TiO 2 , forming slag in blast furnace smelting, and >20% TiO in blast furnace slag 2 cannot be recycled

(2) The process uses the dual method to extract vanadium and make steel. A batch of molten iron needs to be smelted twice in the converter to complete the process of vanadium extraction and steelmaking, which cannot make full use of the production capacity of the converter.

According to statistics, the loss of molten steel in smelting is 5%, which reduces the iron recovery of vanadium-titanium iron concentrate

(4) The semi-steel after vanadium extraction has insufficient heat during steelmaking, so a large amount of scrap steel cannot be used in the steelmaking process, and the relative cost of steelmaking is relatively high

(5) Vanadium extraction by converter prolongs the smelting process of iron→steel for more than 20 minutes, which brings certain difficulties to the production organization of iron→steel→continuous casting when the continuous casting process is adopted

[0010] The main problems of the second vanadium-first iron flow process are: (1) the same batch of vanadium-titanium-iron concentrate must be roasted at high temperature twice (sodiumization and reduction) to obtain V 2 o 5 Vanadium-containing aqueous solution and iron with a concentration of 10g / L require a large amount of raw material processing, long process and high cost

The amount of residue after the titanium extraction process can be 30%, which is five times that of using titanium concentrate, so that the titanium slag, an intermediate product in the process, encounters high cost and difficulty in pollution control when it is used as a raw material for titanium dioxide

[0011] The main problems of the third iron-first-vanadium process are as follows: (1) Metallized pellets need to be mixed with carbon during the melting process, the molten pool is a reducing atmosphere, and vanadium needs to exist in the slag phase in the form of oxides Oxidizing atmosphere

Due to the high FeO in the slag, the recovery rate of iron is reduced, and the corrosion of the slag to the lining of the electric furnace is increased, so that the utilization factor of the electric furnace is low and the consumption of refractory materials is large.

(2) Titanium slag obtained after leaching vanadium from molten slag, TiO 2 The grade is 48%, and the acid melting property is poor when used to make titanium dioxide. Therefore, using titanium slag as titanium dioxide raw material consumes a lot, costs high, and the pollutants are not easy to handle.

It is economically uneconomical to process vanadium-titanium slag separately to recover vanadium-titanium, and the application scale of this process is limited

[0013] The main disadvantages of the fifth single slag return process flow are: (1) same as the blast furnace converter process, only vanadium and iron are recovered in the process, and titanium is not recovered

The vanadium-titanium iron concentrate mixed with steel slag has 53% total iron, and the total iron in the mixture is less than 40%, so that the slag-iron ratio of vanadium-containing molten iron in the small blast furnace reaches 1.7, and the utilization factor of the small blast furnace is low

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