As an important part of the continuous casting process, the tundish's working lining needs to withstand the scouring and erosion of high-temperature molten steel. Traditional siliceous materials are no longer suitable for the current alkaline steelmaking, so alkaline refractory materials are mostly used, mainly magnesium materials. Magnesium dry ramming mass material has the advantages of simple construction, high thermal efficiency, high slag shell removal rate, and long service life, and is favored by the steel smelting industry.
Development process
1. Raw material selection:
Magnesium raw materials: mainly fused magnesia and sintered magnesia, which have high refractoriness and corrosion resistance.
Binder: Traditional phenolic resin binders are prone to environmental pollution and are expensive, so it is necessary to find more environmentally friendly and economical binders during the development process. Studies have shown that sodium metasilicate heptahydrate can be used as the main binder and used in combination with phenolic resin to improve the performance of the material and reduce environmental pollution.
2. Particle grading:
By studying the influence of different particle grading on the bulk density of magnesium dry ramming mass, the better particle grading scheme is determined.
A better particle grading scheme can make the packing density of dry materials higher, thereby improving their anti-scouring and anti-erosion performance.
3. Preparation process:
The magnesium dry material is prepared by vibration molding process. By controlling parameters such as vibration pressure and time, the dry material has better density and strength.
During the preparation process, it is necessary to strictly control parameters such as the mixing ratio, mixing time and temperature of the raw materials to ensure the stable and reliable performance of the dry material.
Performance evaluation and optimization
1. Performance test: The developed magnesium dry ramming mass is tested for performance, including anti-scouring, anti-erosion, thermal shock stability, etc. The performance is evaluated by comparative testing with traditional magnesium dry materials.
2. Optimization and improvement:
According to the performance test results, the raw material ratio, particle grading and preparation process are optimized and improved. Through continuous iteration and optimization, the performance of the developed magnesium dry material is more superior and meets the needs of the steel smelting industry.
Compared with traditional magnesium dry ramming mass materials, environmentally friendly dry materials have better environmental performance and economic benefits. The use of environmentally friendly dry materials can reduce production costs, improve production efficiency, and reduce environmental pollution.
