Scholarlink

<p>The integrated utilization of energy and materials from pyrometallurgical slags (&gt;1 billion tonnes per year globally) remains a universal challenge. This study converted 1600&#xa0;°C molten silicomanganese slag (SMS) into the low-carbon large-volume cast stone (1.50&#xa0;m×0.45&#xa0;m×0.65&#xa0;m) in tonne-scale field experiments by optimizing its heat treatment regime (10&#xa0;h crystallization holding at 900&#xa0;°C, furnace cooling), processable into building slabs. The results show that controlling the internal temperature gradient of molten slag during solidification and crystallization is feasible for preparing cast stone with uniform overall properties. A rapid heating process was adopted in optimized tests, avoiding secondary heating of slag at the mold edge and keeping the global temperature of cast stones stable within the 900–1100&#xa0;°C crystallization range, thus achieving synchronized crystallization and inhibiting segregation. The optimized cast stone exhibited enhanced overall compositional uniformity with reduced mass fraction standard deviations (<i>σ</i><sub>m</sub>) of CaO (from 1.05% to 0.18%, mass fraction) and SiO<sub>2</sub> (from 0.77% to 0.19%), and a more homogeneous size and distribution of crystals. Consequently, stress and crack formation were suppressed, and the standard deviations of flexural and compressive strengths (<i>σ</i><sub>s</sub>) dropped from 23.70 and 116.06 to 6.17 and 22.99&#xa0;MPa, respectively. This novel producing process of slag-based cast stone cut CO<sub>2</sub> emissions by 79.5% vs. traditional processes, promoting industrial molten slag recycling and carbon emission reduction via efficient synergistic utilization of its heat and materials.</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

Segregation inhibition and performance enhancement of low carbon large-volume cast stone from molten silicomanganese slag

  • 期刊论文

  • 发表日期：

    2026年5月21日

查看全文
  • Yi Huang,
  • Zhixiang Xiao,
  • Yu Li,
  • Shenghan Pan,
  • Daqiang Cang

摘要

The integrated utilization of energy and materials from pyrometallurgical slags (>1 billion tonnes per year globally) remains a universal challenge. This study converted 1600 °C molten silicomanganese slag (SMS) into the low-carbon large-volume cast stone (1.50 m×0.45 m×0.65 m) in tonne-scale field experiments by optimizing its heat treatment regime (10 h crystallization holding at 900 °C, furnace cooling), processable into building slabs. The results show that controlling the internal temperature gradient of molten slag during solidification and crystallization is feasible for preparing cast stone with uniform overall properties. A rapid heating process was adopted in optimized tests, avoiding secondary heating of slag at the mold edge and keeping the global temperature of cast stones stable within the 900–1100 °C crystallization range, thus achieving synchronized crystallization and inhibiting segregation. The optimized cast stone exhibited enhanced overall compositional uniformity with reduced mass fraction standard deviations (σm) of CaO (from 1.05% to 0.18%, mass fraction) and SiO2 (from 0.77% to 0.19%), and a more homogeneous size and distribution of crystals. Consequently, stress and crack formation were suppressed, and the standard deviations of flexural and compressive strengths (σs) dropped from 23.70 and 116.06 to 6.17 and 22.99 MPa, respectively. This novel producing process of slag-based cast stone cut CO2 emissions by 79.5% vs. traditional processes, promoting industrial molten slag recycling and carbon emission reduction via efficient synergistic utilization of its heat and materials.

Graphical Abstract