Method for enhancing oxygen potential of blast furnace hearth for making iron from vanadium titano-magnetite

Abstract

The invention belongs to the field of blast furnace smelting, and particularly relates to a method for enhancing oxygen potential of a blast furnace hearth for making iron from vanadium titano-magnetite. The technical scheme is as follows: an iron concentrate is sprayed into a blast furnace through a blast hole. Since the iron concentrate contains FeO, oxygen is introduced into the furnace hearth so as to maintain high oxygen potential in the high temperature region, thereby inhibiting the generation of Ti(CN) and other high-melting-point substances, further being beneficial to improving the blast furnace smelting process and achieving the goal of blast furnace reinforced smelting. The invention enhances the in-furnace vanadium titano-magnetite ratio, increases the utilization coefficient of the blast furnace, and lowers the iron production cost; and the invention is convenient to operate.

Description

technical field [0001] The invention belongs to the field of blast furnace smelting, and in particular relates to a method for increasing the oxygen potential of a blast furnace hearth for vanadium-titanium-magnetite ironmaking. Background technique [0002] In the process of blast furnace smelting vanadium-titanium magnetite, the sintered ore is in the high-temperature zone below the reflow zone, and the redox property of iron is better. Therefore, the iron oxides entering the melt are quickly reduced to form metallic iron (in the molten The primary slag is mainly low-valent iron oxide FeO and titanium oxide). However, as the charge gradually descends into the high-temperature area of ​​the lower part of the blast furnace, the iron oxides in the sinter are rapidly reduced, and the oxygen potential in the primary slag is quickly reduced, that is, the oxidation property is weakened. Since the oxygen potential below the reflow zone of the blast furnace decreases rapidly, it i...

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Problems solved by technology

However, as the charge gradually descends into the high-temperature area of ​​the lower part of the blast furnace, the iron oxides in the sinter are rapidly reduced, which quickly reduces the oxygen potential in the primary slag, that is, the oxidation property is weakened.

Since the oxygen potential below the reflow zone of the blast furnace decreases rapidly, it is beneficial to the reduction of titanium and the formation of Ti(CN). The formation of Ti(CN) directly affects the performance of the slag, making the slag thicker, which is not conducive to the formation of slag iron. separate