Preparation method of super-pure industrial iron

Abstract

The invention relates to a preparation method of super-pure industrial iron. The preparation method includes: melting sponge iron in an induction furnace under a non-vacuum state; adding slagging material for slagging after molten steel has no bubbles; adding carbon powder into the molten steel in batches, vacuumizing at the same time to deoxidize the molten steel, and allowing the vacuum degree to increase gradually; desulfurizing the molten steel, to be more specific, slagging again, controlling the alkalinity of slag to be at 3-5, and adding aluminum powder to the surface of the slag in one step according to a proportion that 5-20g of aluminum powder is added to each kilogram of slag material; tapping and pouring into blanks. The super-pure industrial iron prepared by the method has the advantages that the super-pure industrial iron is high in purity, extremely good in quality and capable of perfectly satisfyting the requirements of high-end users, the C and O contents and Si, Mn and Al contents of the super-pure industrial iron is evidently lowered as compared with those of conventional industrial pure iron, and better economic benefits can be brought to production enterprises.

Description

technical field [0001] The invention relates to a method for smelting iron, in particular to a method for smelting industrial pure iron. Background technique [0002] Ultra-pure iron is an important steel base material. When it is used as a deep-drawing material, it can be stamped into extremely complex shapes; when it is used as an electromagnetic material, it will have high magnetic sensitivity and low magnetic resistance. It is mainly used for smelting various high-temperature alloys, heat-resistant alloys, precision alloys, maraging steels, etc. In the defense industry and electronics industry, it is an indispensable raw material for the manufacture of radar, communications, motors, electron tubes, and artificial satellites. [0003] In recent years, ultra-pure iron has developed extremely rapidly at home and abroad. At present, in the production of ultra-high-purity iron, whether it is electrolytic purification, regional purification, electromagnetic levitation smelt...

AI Technical Summary

Problems solved by technology

On the one hand, it has been confirmed that the smelting of high-purity pure iron must use sponge iron with high TFe and MFe and low gangue content as raw material, but on the other hand, due to the limitation of the process and the controllability of the operation, the disadvantage is that it can be obtained The content of C and O in pure iron is still high, and the content of Si and Mn is also high, which still cannot meet the requirements of deep drawing performance in the defense industry and aerospace field, and the high sensitivity and low diamagnetism in the electronics industry and communication industry. needs