Method for producing high-purity pure iron

A high-purity, pure iron technology, applied in the field of metallurgy, can solve the problems of complex process, lengthy process, numerous refining procedures, etc., and achieve the effect of uniform temperature, precise control of composition, and small deviation of composition.

Active Publication Date: 2014-11-12
武汉桂坤科技有限公司
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Problems solved by technology

Through the above schematic diagram of the process flow, we can find that the traditional production process is lengthy

Method used

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  • Method for producing high-purity pure iron
  • Method for producing high-purity pure iron
  • Method for producing high-purity pure iron

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[0041] The present invention will be further described in combination with the embodiments.

[0042] The production equipment used in the present invention is such as image 3 As shown, the bottom blowing argon-oxygen composite gas system is added to the bottom of the traditional intermediate frequency or power frequency induction furnace, that is, the composite bottom blowing ventilating brick 7 is inserted into the composite bottom blowing tube 8. The composite bottom blowing ventilating brick 7 adopts a multi-step structure, which can effectively avoid Breakout occurs when blowing argon-oxygen composite gas at the bottom. Blowing argon-oxygen composite gas from the bottom of the ladle, bottom blowing oxygen can effectively decarburize, silicon, manganese, etc.; at the same time, bottom blowing argon stirring, under the action of high temperature, the argon bubbles expand rapidly (the volume expansion is about 100 times) and float up , To drive the convection of the molten ste...

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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...

Claims

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Application Information

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IPC IPC(8): C21B13/14C21C7/04C21C7/06C21C7/064C21C7/068C22B9/18B22D11/045
CPCY02P10/25
Inventor 李森蓉李雄
Owner 武汉桂坤科技有限公司
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