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<p>The efficient recovery of iron, nickel and chromium from laterite nickel ore by the pyrometallurgy process is important for the stainless steel industry. In general, the increasing Al<sub>2</sub>O<sub>3</sub> content of the low-grade laterite nickel caused the high melting temperature of slag and affected the recovery rates of valuable elements. The study on the element distribution behavior between slag and iron in the smelting process of high Al<sub>2</sub>O<sub>3</sub>-type low-grade laterite nickel ore has important guiding significance for efficient recovery of Cr and other alloying elements. In this study, the influences of slag composition on the distribution of elements between the high Al<sub>2</sub>O<sub>3</sub> slag and molten iron were studied by thermodynamic calculations and high-temperature equilibrium experiments. The results indicated that for the CaO-SiO<sub>2</sub>-MgO-Al<sub>2</sub>O<sub>3</sub>-Cr<sub>2</sub>O<sub>3</sub> slag system, with the increase of Al<sub>2</sub>O<sub>3</sub> content, the sulfur distribution ratio between slag and iron decreased and the recovery of valuable elements decreased with the higher Al<sub>2</sub>O<sub>3</sub> content. The distribution of Cr between iron and slag increased with the increase of MgO content but decreased with the increase of MnO content. Moreover, the S distribution ratio between slag and iron increased with the increase of MgO and MnO contents.</p>

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Distribution Behaviors of Cr and S Between the High Al2O3 Slag and Stainless Steel Master Alloy

  • 期刊论文

  • 发表日期：

    2025年2月14日

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  • Shuai Wang,
  • Jianfeng Yang,
  • Yufeng Guo,
  • Ying Jiang,
  • Zhuang Yang,
  • Guang Li,
  • Feng Chen,
  • Lingzhi Yang,
  • Tao Jiang

摘要

The efficient recovery of iron, nickel and chromium from laterite nickel ore by the pyrometallurgy process is important for the stainless steel industry. In general, the increasing Al2O3 content of the low-grade laterite nickel caused the high melting temperature of slag and affected the recovery rates of valuable elements. The study on the element distribution behavior between slag and iron in the smelting process of high Al2O3-type low-grade laterite nickel ore has important guiding significance for efficient recovery of Cr and other alloying elements. In this study, the influences of slag composition on the distribution of elements between the high Al2O3 slag and molten iron were studied by thermodynamic calculations and high-temperature equilibrium experiments. The results indicated that for the CaO-SiO2-MgO-Al2O3-Cr2O3 slag system, with the increase of Al2O3 content, the sulfur distribution ratio between slag and iron decreased and the recovery of valuable elements decreased with the higher Al2O3 content. The distribution of Cr between iron and slag increased with the increase of MgO content but decreased with the increase of MnO content. Moreover, the S distribution ratio between slag and iron increased with the increase of MgO and MnO contents.