Method for producing high-purity pure iron

Abstract

The invention relates to a method for producing high-purity pure iron. The method includes the following steps: iron oxide is reduced in a layered-control mode through a direct-reduction system to manufacture sponge iron; the sponge iron is added into a medium-frequency or power-frequency induction furnace for smelting, and composite slag forming constituents are added in batches; after smelting and slagging-off are conducted, composite slag forming constituents are added, argon-oxygen mixed gas bottom blowing is carried out on the medium-frequency or power-frequency induction furnace through porous bricks at the bottom, blowing of the mixed gas is stopped when the temperature of molten steel reaches 1620 DEG C to 1650 DEG C, standing is carried out on the molten steel for 25 minutes to 35 minutes, then slagging-off is conducted, a proper amount of aluminum is added into the molten steel for 1 minute to 2 minutes, argon bottom blowing is carried out through the air bricks at the bottom of the induction furnace at the moment, and stopped when the temperature is continuously raised to range from 1640 DEG C to 1680 DEG C, horizontal continuous casting or bottom casting is conducted after standing is conducted on the molten steel for 15 minutes, and the low-impurity pure iron with the iron content larger than 99.9% is obtained, wherein the contents of more than twenty elements are all smaller than 0.01%. Meanwhile, the pure iron with the higher purity can be produced through vacuum refining or electroslag remelting. By means of the method, the flow path is short, devices are simple, and investment is saved.

Description

technical field [0001] The invention relates to a method for producing high-purity pure iron, which mainly adopts direct reduction technology and melting separation technology to pass through modified intermediate frequency / power frequency furnace, horizontal continuous casting, bottom pouring, electroslag gravity under non-vacuum or vacuum conditions. Melting and other production of high-purity pure iron and ultra-high-purity iron belong to the field of metallurgy technology. Background technique [0002] Iron-carbon alloys with a carbon content of less than 0.04% are called low-carbon steel or carbon-free steel, also known as industrial pure iron, which has excellent physical properties such as low coercive force, good thermal conductivity and electromagnetic properties. It mainly includes electromagnetic pure iron and raw material pure iron: electromagnetic pure iron is a functional soft magnetic material, which requires excellent electromagnetic properties, and is mainly...

AI Technical Summary

Problems solved by technology

Through the above schematic diagram of the process flow, we can find that the traditional production process is lengthy, the refining process is numerous, and the production of high-purity pure iron requires complex processes and equipment

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