La2O3对含B2O3无氟连铸保护渣物理性能的影响

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La₂O₃对含B₂O₃无氟连铸保护渣物理性能的影响

基金项目:

内蒙古自然科学基金资助项目(项目编号:20080404MS0704)。

1. Department of Metallurgical and Chemical Engineering, Jiyuan Vocational and Technical College, Jiyuan 454650, Henan, China;
2. Materials and Metallurgy School, Inner Mongolia University of Science and Technology, Baotou 014010, lnner mongolia, China

摘要: 针对含B₂O₃无氟保护渣抑制晶体析出的问题,研究了当保护渣碱度(CaO/SiO₂)等于0.9,成分为w_CaO 27%~36.47%、w_SiO₂ 30%~40.5%、w_Al₂O₃ 4%、w_MgO 5%、w_Na₂O 0.8%、w_Li₂O%、w_B₂O₃ 4%时,w_La₂O₃从0增加到20%对无氟结晶器保护渣结晶性能及渣膜传热的影响。试验表明La₂O₃能够提高保护渣的渣膜厚度,提高其结晶率和结晶温度,降低熔渣的熔化温度,从而有效提高控制结晶器传热的能力。
- 连铸 /
- 无氟结晶器保护渣 /
- La₂O₃ /
- 结晶性能 /
- 渣膜传热
Abstract: In order to solve the problem that B₂O₃-containing fluoride-free casting powder tends to refrain the formation of crystals,crystallization properties of the fluoride-free mold casting powder and heat transfer of slag film were investigated with the basicity（CaO/SiO₂） of casting powder at 0.9,compositions of 27% ~36.47% w_CaO,30% ~40.5% w_SiO₂,4% w_Al₂O₃,5% w_MgO,8% w_Na₂O,2% w_Li₂O and 4% w_B₂O₃ and the increase of w_La₂O₃ from 0 to 20%.The research shows that La₂O₃ can increase the thickness,crystallization ratio and crystallization temperature of slag film and reduce the melting temperature of the molten slag,thus effectively improveing heat transfer performance of the mold.
- continuous casting /
- fluoride-free mold casting powder /
- La₂O₃ /
- crystallization property /
- heat transfer of slag film