• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ISIJ international >High Carbon Ferro-chromium Production by Self-reducing Process: Effects of Fe–Si and Fluxing Agent Additions
【24h】

High Carbon Ferro-chromium Production by Self-reducing Process: Effects of Fe–Si and Fluxing Agent Additions

机译：通过自还原工艺生产高碳铬铁：铁硅和助熔剂添加的影响

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The technology of self-reducing pellets for ferro-alloys production is becoming an emerging process due to the lower electric energy consumption and the improvement of metal recovery in comparison with the traditional process. This paper presents the effects of reduction temperature, addition of ferro-silicon and addition of slag forming agents for the production of high carbon ferro-chromium by utilization of self-reducing pellets. These pellets were composed of Brazilian chromium ore (chromite) concentrate, petroleum coke, Portland cement, ferro-silicon and slag forming components (silica and hydrated lime). The pellets were processed at 1773 K, 1823 K and 1873 K using an induction furnace. The products obtained, containing slag and metallic phases, were analyzed by scanning electron microscopy and chemical analyses (XEDS). A large effect on the reduction time was observed by increasing the temperature from 1773 K to 1823 K for pellets without Fe–Si addition: around 4 times faster at 1823 K than at 1773 K for reaction fraction close to one. However, when the temperature was further increased from 1823 K to 1873 K the kinetics improved by double. At 1773 K, the addition of 2% of ferro-silicon in the pellet resulted in an increasing reaction rate of around 6 times, in comparison with agglomerate without it. The addition of fluxing agents (silica and lime), which form initial slag before the reduction is completed, impaired the full reduction. These pellets became less porous after the reduction process.
机译：与传统工艺相比，由于铁耗更低，金属回收率更高，用于铁合金生产的自还原球团技术正在成为一种新兴工艺。本文介绍了利用自还原球团还原温度，添加硅铁和添加成渣剂对高碳铬铁生产的影响。这些球团由巴西铬矿（铬铁矿）精矿，石油焦，波特兰水泥，硅铁和矿渣形成成分（二氧化硅和熟石灰）组成。使用感应炉在1773 K，1823 K和1873 K下对颗粒进行处理。通过扫描电子显微镜和化学分析（XEDS）分析获得的包含炉渣和金属相的产物。对于未添加Fe-Si的球团，将温度从1773 K提高到1823 K，可以观察到对还原时间的巨大影响：在1823 K时，反应分数接近1时，在1773 K处快约4倍。但是，当温度从1823 K进一步提高到1873 K时，动力学提高了两倍。在1773 K下，与没有团块的团块相比，在团粒中添加2％的硅铁导致反应速率提高了约6倍。在还原完成之前形成初始炉渣的助熔剂（二氧化硅和石灰）的加入会损害全部还原。在还原过程之后，这些粒料的孔隙度降低。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号