Reduction Dephosphorization of Ferromanganese in High-Manganese Steel Smelting
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Solution Overview
Problem
Conventional methods for smelting high-manganese steel fail to effectively reduce phosphorus content, leading to degraded mechanical properties and increased costs due to high-purity manganese requirements.
Innovation Solution
A method involving reduction dephosphorization of ferromanganese using an electric arc furnace and intermediate-frequency induction furnace, where oxidative dephosphorization slags are utilized to oxidize phosphorus in reductive slags, producing low-phosphorus ferromanganese, which is then added to molten steel, reducing phosphorus content and improving production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ferromanganese is added during the reductive period of electric arc furnace smelting, then manganese content in high-manganese steel is increased, but phosphorus content increases and cannot be removed
Solution Approach 1:
The patent applies preliminary action by pre-treating ferromanganese in a medium-frequency induction furnace to remove phosphorus before adding it to the electric arc furnace. The ferromanganese is melted and subjected to oxidative dephosphorization in advance, converting phosphorus to phosphorus-containing slag that can be removed, thus preventing phosphorus from entering the final steel product
Solution Approach 2:
The patent segments the ferromanganese addition process into two distinct stages: (1) pre-treatment stage in medium-frequency induction furnace where phosphorus is removed, and (2) main smelting stage in electric arc furnace where the pre-treated ferromanganese is added. This segmentation allows phosphorus removal to occur separately from the main smelting process, resolving the contradiction between adding manganese and avoiding phosphorus
2Object-affected harmful factors
If high-purity manganese metal is used as alloy, then phosphorus content in final product is reduced, but production cost increases substantially
Solution Approach 1:
The patent converts the harmful effect of phosphorus in ordinary ferromanganese into a beneficial process by using oxidative dephosphorization. The phosphorus that would normally contaminate the steel is oxidized and transferred to slag phase, which is then removed. This transforms ferromanganese with high phosphorus content into a viable raw material that achieves low-phosphorus steel without requiring expensive high-purity manganese metal
Solution Approach 2:
The patent uses ordinary ferromanganese with relatively high phosphorus content as a disposable intermediate material that is pre-treated to remove phosphorus. Instead of using expensive high-purity manganese metal directly, the process allows phosphorus removal in a separate stage, making the ferromanganese effectively 'disposable' in its original form and replacing it with a purified version that achieves the desired low-phosphorus result at lower cost
3Object-affected harmful factors
If conventional oxidative dephosphorization is performed only in electric arc furnace, then phosphorus removal is limited, but production efficiency is reduced
Solution Approach 1:
The patent segments the dephosphorization process into two phases: oxidative dephosphorization in the medium-frequency induction furnace (pre-treatment stage) and final dephosphorization in the electric arc furnace (main smelting stage). This segmentation allows phosphorus removal to begin before the main smelting process, improving overall efficiency by reducing the phosphorus burden on the electric arc furnace
Solution Approach 2:
The patent performs preliminary dephosphorization action in the medium-frequency induction furnace before the main smelting operation. By removing a portion of phosphorus in advance through oxidative treatment and slag removal, the subsequent electric arc furnace operation requires less dephosphorization effort, thereby improving overall production efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Substantially reduces phosphorus content in high-manganese steel, enhances production efficiency, saves energy, and allows for resourceful utilization of phosphorus-containing slags, thereby lowering production costs and improving steel performance.
Implementation Method 1
A method involving reduction dephosphorization of ferromanganese using an electric arc furnace and intermediate-frequency induction furnace
Implementation Method 2
heating up the medium-carbon ferromanganese to a molten state by using a mediate-frequency induction furnace
Implementation Method 3
oxidative dephosphorization slags are utilized to oxidize phosphorus in reductive slags
Implementation Method 4
reduction dephosphorization of ferromanganese
Implementation Method 5
adding a first slagging agent to the LF ladle refining furnace to prepare reducing slags
Data Source
AI summary
A method for smelting low-phosphorus high-manganese steel based on reduction dephosphorization of ferromanganese is provided in the present application, relating to the technical field of high-manganese steel smelting, where the dephosphorization of ferromanganese is carried out under reducing atmosphere conditions through mediate-frequency induction furnace to obtain molten ferromanganese with lower phosphorus content, which is subsequently mixed with low phosphorus molten steel obtained by smelting in oxidative period of electric arc furnace in LF ladle refining furnace to make the Mn content of steel reach the requirement of high-manganese steel, and smelting is carried out under the condition of reducing atmosphere by adjusting the composition and temperature of the molten steel to meet the requirements of the target composition of the steel grade before tapping the steel.