Method for directly smelting high-titanium molten iron by using converter

Abstract

The invention discloses a method for directly smelting high-titanium molten iron by using a converter, which comprises the following steps of: (1) adding magnetic separation slag and sludge balls in the earlier stage of converting so as to promote vanadium titanium molten iron to scum more quickly in the earlier stage; (2) converting by a method of low lance position and large flow of oxygen, and weakening the temperature echelon and the concentration gradient of a converter molten pool, so that pig iron, the magnetic separation slag and the sludge balls are quickly melted in the earlier stage; (3) strongly stirring, so that after FeO in the magnetic separation slag and the sludge balls are melted, the magnetic separation slag and the sludge balls as well as slagging raw materials form furnace slag; and (4) reducing the content of iron oxide of the slag, and weakening the foaming tendency of the slag to prevent foam splashing. The method provided by the invention has the following advantages: (1) the vanadium titanium molten iron is directly smelted in the converter without extracting vanadium and titanium from the molten iron; (2) the plashing is favorably reduced, the converter protection effect by slag splashing is improved, the stability of smelting of the converter is improved, and the splashing rate of the converter is reduced; and (3) the resource recycling rate is increased, the consumption of iron and steel materials is reduced and the cost is reduced. The method is suitable for iron and steel smelting enterprises.

Description

technical field [0001] The invention relates to a pig iron smelting process, in particular to a method for directly smelting high-titanium molten iron in a reblowing converter. Background technique [0002] In recent years, the supply of ordinary iron ore has become increasingly tight, and the price of iron ore has continued to rise, resulting in a continuous increase in the cost of pig iron. In order to alleviate the shortage of mineral resources and expand the source of iron-containing raw materials, some enterprises add a certain amount of magnetite ore containing Ti and V to the blast furnace, resulting in the Ti content in molten iron reaching 0.12-0.4% (average 0.25%), V When the content reaches 0.11-0.25% (0.18% on average), it is uneconomical to extract vanadium from this kind of hot metal; while direct smelting of this kind of hot metal by converter is prone to rapid slagging, severe foaming and splashing in the early stage of blowing, high metal loss, Increase the...

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Problems solved by technology

[0003] There are not many applications involving smelting ilmenite-containing ore in the Chinese patent database, only CN102051427A "Mixed Smelting of High Phosphorus Iron Ore Using Oxygen-enriched Top Blowing Smelting Reduction Technology Method for producing low-phosphorus and low-titanium molten iron with ilmenite", CN101906498A "Method for comprehensively smelting vanadium-ilmenite", etc., so far, there is no report on the technical scheme of directly smelting high-titanium molten iron in a converter