Study on production technology of ultra-pure industrial pure iron
03/31/2025 Ultra-pure iron is an important basic material for steel, which is mainly used for smelting various superalloys, heat-resistant alloys, precision alloys, maraging steels and other aerospace, military and civil alloys or steels. In recent years, it has developed extremely rapidly at home and abroad. Developing the preparation technology of high-purity iron can expand its application range.For the current market situation, High purity Iron It has a very advantageous development prospect and an extremely superior ecological environment. https://www.slhpureiron.net
The preparation technology of ultra-pure iron in China is still immature, and the supply of ultra-pure iron can not meet the demand. However, it is studied to smelt ultra-pure iron with sponge iron as iron source in induction furnace. From the raw material point of view, the output of sponge iron is increasing and the price is relatively cheap. In terms of composition, the content of residual elements in sponge iron is low, and the purity of ultra-pure iron products is high.
In this paper, under the laboratory conditions, the experimental study on smelting ultra-pure iron with sponge iron in induction furnace was carried out with 25kg medium frequency induction furnace and 25kg vacuum induction furnace. The main research contents include the thermodynamics and kinetics of deep dephosphorization of sponge iron, the selection of dephosphorization slag system and the factors affecting deep dephosphorization of steel, etc. Pure iron with phosphorus content of about 10ppm is smelted from sponge iron in induction furnace.
On this basis, the thermodynamic conditions of deep desulfurization of steel are analyzed theoretically, and the effects of composition melting point of desulfurization slag system, mechanical mixed slag and premelted refining slag on desulfurization of steel are studied through experiments. Through theoretical analysis and experimental data, the conditions that must be met for deep desulfurization of molten steel are obtained, and finally the sulfur content in molten steel is reduced to about 10ppm in the induction furnace.
It is feasible to smelt ultra-pure iron with sponge iron or direct reduced iron in induction furnace as long as the thermodynamic conditions of dephosphorization and desulfurization are well controlled and the composition of smelting slag system is selected. If it can be applied to large-scale industrial production, it will have a good application prospect.
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