BaCO3 Dephosphorizing Flux Prevents Nozzle Plugging
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Solution Overview
Problem
Current dephosphorization techniques for ferro-manganese are inefficient, require complex processes, and involve environmentally harmful substances, leading to high production costs and nozzle plugging issues during the dephosphorization of high-carbon molten steel.
Innovation Solution
A dephosphorizing flux comprising BaCO3 as a main material and supplementary materials like NaHCO3 or Na2CO3 and CaF2, which are mixed to optimize the phosphorous removal efficiency, lower the melting point of slag, and prevent nozzle plugging, while minimizing environmental pollution and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If FeMn with high Mn content (99% Mn or 15-30 wt% Fe) is used to increase manganese content in steel, then the Mn content in steel products is improved, but the phosphorous content in FeMn increases leading to brittleness in steel products
Solution Approach 1:
The patent changes the chemical composition parameters of the dephosphorizing flux by specifying precise ranges of BaCO3 (40-70 wt%), CaF2 (10-30 wt%), Na2SiO3 (10-30 wt%), and other components. This optimized composition enables effective phosphorous removal while maintaining manganese content, resolving the contradiction between high Mn content and low P content in FeMn additives
2Object-affected harmful factors
If traditional dephosphorization methods using BaCO3-based flux are employed, then phosphorous removal is achieved, but nozzle plugging occurs and production costs increase
Solution Approach 1:
The patent creates a composite dephosphorizing flux system combining BaCO3 as the main active component with CaF2, Na2SiO3, and other auxiliary materials. This composite formulation improves fluidity and reduces viscosity, preventing nozzle plugging while maintaining effective phosphorous removal capability
Solution Approach 2:
The patent optimizes the compositional parameters of the flux to control melting point and viscosity characteristics. By adjusting the ratios of BaCO3, CaF2, and Na2SiO3 within specific ranges, the flux achieves optimal flow properties that prevent nozzle plugging during the dephosphorization process
3Object-affected harmful factors
If complex dephosphorization processes with multiple stages are used, then phosphorous removal efficiency is improved, but production time and costs increase
Solution Approach 1:
The patent segments the dephosphorizing flux into functional components with specific roles: BaCO3 for phosphorous removal, CaF2 for fluidity enhancement, Na2SiO3 for slag structure control, and minor additives for reaction promotion. This segmentation allows each component to work efficiently, achieving high dephosphorization rates in shorter times
Solution Approach 2:
The multi-component composite flux formulation enables simultaneous achievement of multiple objectives: phosphorous removal, slag fluidity control, and reaction rate enhancement. This integrated approach eliminates the need for multiple sequential processing stages, reducing overall production time
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
The dephosphorizing flux improves the dephosphorization ratio by at least 30%, reduces environmental risks, and prevents nozzle plugging, achieving efficient phosphorous removal with reduced costs and environmental impact.
Implementation Method 1
a process becomes complicated because a process stage should be undergone in which calcinations reaction of BaCO3 is induced and BaO should be generated
Implementation Method 2
a dephosphorizing flux capable of lowering the melting point of slag and securing fluidity
Implementation Method 3
The dephosphorization technology for lowering the phosphorous (P) content in FeMn includes a method of using FeMn slag
Data Source
AI summary
Provided is a dephosphorizing flux configured to adjust a phosphorous component contained in molten steel, the dephosphorizing flux includes a main material including BaCO3 and a supplementary material, wherein the supplementary material includes a first material containing either of NaHCO3 or Na2CO3 and a second material containing CaF2. Thus, in accordance with a dephosphorizing flux and a method for preparing the same of the present disclosure, the plugging of a lower blowing nozzle that blows a carrier gas during dephosphorization may be prevented while improving a dephosphorization ratio. In addition, since environment polluting substances are not used as in conventional arts, environment pollution risk may be reduced, and the cost burden due to the facility for pollution prevention and harmful substance management may be alleviated.