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Development of Low-fluoride Slag for Electroslag Remelting: Role of Li_2O on the Crystallization and Evaporation of the Slag

机译：用于电袋重熔的低氟炉渣的开发：Li_2O对炉渣结晶和蒸发的作用

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摘要

To reduce environmental pollution caused by fluoride from conventional electroslag remelting (ESR)-type slag and meet the requirements of vacuum ESR, it is strongly needed to develop low-fluoride and fluoride-free slag. The crystallization behaviors and evaporation of CaF_2-CaO-Al_2O_3-MgO-Li_2O slag as a candidate for low-fluoride ESR-type slag were studied. The sequence of crystal precipitation in CaF_2-CaO-Al_2O_3-MgO-Li_2O slag during cooling process was 11CaO·7Al_2O_3·CaF_2 to CaO, followed by CaF_2. The dominant crystalline phase in the slag was 11CaO·7Al_2O_3·CaF_2. The liquidus temperature and crystallization temperature of slag decreased significantly with increasing Li_2O content from 1.59 mass% to 4.46 mass%. Increasing Li_2O contents suppressed the crystallization behaviors of ESR-type CaF_2-CaO-Al_2O_3-MgO-Li_2O slag. The weight loss of the slag melts increased with increasing Li_2O content in the slag from 1.59 mass% to 4.46 mass%. The gaseous species evaporated from the slag melts were mainly LiF and contained a few amounts of CaF_2. A proper amount of Li_2O could be considered as an effective component for the design of low-fluoride ESR-type slag. Serious fluoride evaporation of LiF from CaF_2-CaO-Al_2O_3-MgO-Li_2O slag melts takes place when Li_2O content exceeds a critical value.
机译：为了减少氟化物从常规电渣重熔（ESR）型炉渣引起的环境污染并满足真空ESR的要求，强烈需要开发不氟化物和无氟炉渣。研究了CaF_2-CaO-Al_2O_3-MgO-Li_2O渣作为低氟化物ESR型渣的候选的结晶行为和蒸发。冷却过程中CAF_2-CAO-AL_2O_3-MGO-LI_2O渣中的晶体沉淀序列是11caO·7AL_2O_3·CAF_2至CAO，然后是CAF_2。渣中的主要结晶相是11CaO·7Al_2O_3·CAF_2。炉渣的液相高温和结晶温度显着降低，随着1.59质量％至4.46质量％的增加，Li_2O含量增加显着。增加Li_2O内容抑制了ESR型CAF_2-CAO-AL_2O_3-MGO-LI_2O渣的结晶行为。炉渣的重量损失随着炉渣中的增加而增加的1.59质量％至4.46质量％。从炉渣熔化蒸发的气态物种主要是LiF，含有几种CaF_2。适量的LI_2O可以被认为是设计低氟ESR型炉渣的有效组件。当Li_2O含量超过临界值时，发生来自CAF_2-CAO-AL_2O_3-MGO-LI_2O渣熔体的严重氟化物蒸发。

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  • 来源
    《ISIJ international》 |2020年第5期|840-847|共8页
  • 作者

    Dingli ZHENG; Jing LI; Chengbin SHI;

  • 作者单位

    State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing (USTB) 30 Xueyuan Road Haidian District Beijing 100083 PR China;

    State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing (USTB) 30 Xueyuan Road Haidian District Beijing 100083 PR China;

    State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing (USTB) 30 Xueyuan Road Haidian District Beijing 100083 PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    low-fluoride slag; electroslag remelting; crystallization; evaporation; Li_2O;

    机译：低氟炉渣;电渣重熔;结晶;蒸发;li_2o.;

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