Scholarlink

<p>The potential for recycling basic oxygen steelmaking (BOS) slag into a P-rich stream for use as a fertilizer and a Fe-rich stream for on-plant recycling was investigated by studying the segregation of P between dicalcium silicate (C<sub>2</sub>S)-tricalcium phosphate (C<sub>3</sub>P) precipitates and the surrounding liquid. Samples of synthetic and industrial BOS slags were put through a homogenization stage at 1600&#xa0;°C and a separation stage at 1450&#xa0;°C, then fast cooled and characterized. The segregation and morphology of P were found to be strongly affected by the composition of the slag. Dendrites of C<sub>2</sub>S–C<sub>3</sub>P were formed at higher basicities (V-ratio ≥ 2.6) and lower Al<sub>2</sub>O<sub>3</sub> contents (≤ 5%). At lower basicity and higher Al<sub>2</sub>O<sub>3</sub> content, the C<sub>2</sub>S–C<sub>3</sub>P dendrites were not formed. Industrial BOS slag samples, after undergoing the same thermal treatment, had similar morphologies and segregation behavior to the synthetic BOS slags. This indicates that despite the simplified compositions of the synthetic BOS slags, they can be used as an analog for studying the industrial BOS slags. Physical separation of the C<sub>2</sub>S–C<sub>3</sub>P dendrites and the Fe-rich liquid into distinct layers was demonstrated for fast cooling of samples after the separation stage at 1450&#xa0;°C. This demonstrates that there is potential for the physical separation of the BOS slag into P-rich and Fe-rich streams.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effects of Slag Composition on Phosphorus Segregation to Dicalcium Silicate-Tricalcium Phosphate Solid Solution for Recycling of Basic Oxygen Steelmaking Slags

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年5月29日

查看全文
  • Raymond J. Longbottom,
  • Oluwatosin A. Aladejebi,
  • Kyoung-Oh Jang,
  • Thi Bang Tuyen Nguyen,
  • Subhasish Mitra,
  • Tom Honeyands,
  • Paul Zulli,
  • Siyu Cheng,
  • Damien O’Dea,
  • Brian J. Monaghan

摘要

The potential for recycling basic oxygen steelmaking (BOS) slag into a P-rich stream for use as a fertilizer and a Fe-rich stream for on-plant recycling was investigated by studying the segregation of P between dicalcium silicate (C2S)-tricalcium phosphate (C3P) precipitates and the surrounding liquid. Samples of synthetic and industrial BOS slags were put through a homogenization stage at 1600 °C and a separation stage at 1450 °C, then fast cooled and characterized. The segregation and morphology of P were found to be strongly affected by the composition of the slag. Dendrites of C2S–C3P were formed at higher basicities (V-ratio ≥ 2.6) and lower Al2O3 contents (≤ 5%). At lower basicity and higher Al2O3 content, the C2S–C3P dendrites were not formed. Industrial BOS slag samples, after undergoing the same thermal treatment, had similar morphologies and segregation behavior to the synthetic BOS slags. This indicates that despite the simplified compositions of the synthetic BOS slags, they can be used as an analog for studying the industrial BOS slags. Physical separation of the C2S–C3P dendrites and the Fe-rich liquid into distinct layers was demonstrated for fast cooling of samples after the separation stage at 1450 °C. This demonstrates that there is potential for the physical separation of the BOS slag into P-rich and Fe-rich streams.

Graphical Abstract