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Breakthrough in slag blocking technology: improving the purity of molten steel and reducing smelting losses
2025-09-28
The breakthrough of slag blocking technology is of great significance for improving the purity of steel water and reducing smelting losses in the steel smelting process. The following is an analysis of the key breakthrough points of this technology and the benefits it brings:
Slag blocking plug
1. The core direction of technological breakthroughs
(1) Material optimization
High performance refractory materials: using composite materials (such as Al ₂ O ∝ - MgO-C series) to enhance high temperature resistance and slag erosion resistance, and extend the service life of slag blocking plugs.
Environmentally friendly biodegradable coating: adding a special coating on the surface of the plug to reduce pollution to the molten steel and achieve more complete separation of the slag layer.
(2) Structural design innovation
Dynamic adjustment structure: Through intelligent design (such as a deformable head) to adapt to different ladle diameters and slag layer thicknesses, accurate slag blocking is achieved.
Multi stage filtration mechanism: Micro porous structures are embedded inside the plug to further adsorb small impurities and improve the cleanliness of the molten steel.
(3) Intelligent control
Sensor integration: Real time monitoring of steel flow rate and slag layer thickness, automatic adjustment of slag blocking timing, reducing manual intervention errors.
AI algorithm prediction: Combining smelting data to optimize slag blocking timing and reduce the probability of slag entrapment in molten steel.
2. Improvement of purity of molten steel
Reduction of inclusions: The slag blocking efficiency is increased by more than 30%, and the content of non-metallic inclusions (such as SiO ₂ and Al ₂ O3) in steel is significantly reduced.
Composition stability: Avoid secondary oxidation in the later stage and ensure accurate control of alloying elements such as Mn and Si.
Low oxygen steel production: Especially suitable for high steel grades such as ultra-low carbon steel, the T.O (total oxygen) content can be controlled below 10ppm.
3. Reduction of smelting losses
Improved yield of molten steel: Reduce the loss of slag coating during slag blocking process, and increase the yield by 0.5% to 1.5%.
The consumption of refractory materials has decreased: the service life of slag blocking plugs has been extended, and the replacement frequency has been reduced by 30% to 50%.
Energy conservation: Shorten the smelting cycle and reduce energy consumption caused by repeated refining.
4. Economic benefits and industry impact
Cost savings: The production cost per ton of steel is reduced by 5-15 yuan (based on an annual output of one million tons of steel mills, the annual benefit reaches 5-15 million yuan).
Quality premium: The qualification rate of higher steel grades has increased, enhancing market competitiveness.
Green production: Reduce waste discharge and comply with environmental policy requirements.
5. Future Development Trends
Multi functional integration: combining slag blocking, temperature measurement, and component detection.
Full process automation: linked with continuous casting and refining processes to achieve intelligent smelting.
Exploration of new materials, such as nano coatings and carbon fiber reinforced composite materials, to further optimize their performance.
Conclusion
The breakthrough of slag blocking technology has significantly improved the purity of molten steel and reduced smelting losses through collaborative innovation of materials, structures, and intelligence, providing key technical support for the high-quality development and green transformation of the steel industry. The next step is to focus on large-scale applications and compatibility optimization with existing production lines.
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