Scholarlink

Abstract <p>One of the main processing routes to obtain FeNi from lateritic ore is the Rotary-Kiln Electric Arc Furnace (RKEF) process. Recently, the exploitation of Ni has led to the processing of low-grade ores, aggravating CO<sub>2</sub> inherent emissions and energy consumption. In this work, a transition technology consisting of selective reduction assisted by magnetic separation (SR-MS) is presented, which is able to be adapted to the RKEF process. A low-grade lateritic ore was investigated, using a laboratory-scale reactor together with a magnetic separator with increasing magnetic fields from 0 to 0.6 T. Ore and reduced fractions as a function of the magnetic field were characterized by means of DSC/TGA, XRF, XRD, and SEM/EDS, determining Fe–Ni contents and crystallographic species. Thermodynamic calculations were used to predict the melting behavior in further smelting process. The results show that SR-MS is able to concentrate Ni from less than 1% in the ore to almost 4% in the calcine. Carbon-based reduction can be adjusted to improve chemical reduction, diminishing CO<sub>2</sub>e emissions from 138.82 to 34&#xa0;kg CO<sub>2</sub>/kg Ni. Further positive impact on energy consumption in the electric arc furnace is expected due to a lower material charge as a result of the Ni concentration.</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

Combined Selective Reduction-Magnetic Separation as Transition Technologies to Decrease CO/CO2 Emissions and Upgrade Lateritic Ores

  • 期刊论文

  • 发表日期：

    2025年6月10日

查看全文
  • Juan Carlos Garavito-Huertas,
  • Fabio Raul Perez-Villamil,
  • Mauricio Alberto Bermudez-Cella,
  • Martin Emilio Mendoza-Oliveros,
  • Lais Mujica-Roncery

摘要

Abstract

One of the main processing routes to obtain FeNi from lateritic ore is the Rotary-Kiln Electric Arc Furnace (RKEF) process. Recently, the exploitation of Ni has led to the processing of low-grade ores, aggravating CO2 inherent emissions and energy consumption. In this work, a transition technology consisting of selective reduction assisted by magnetic separation (SR-MS) is presented, which is able to be adapted to the RKEF process. A low-grade lateritic ore was investigated, using a laboratory-scale reactor together with a magnetic separator with increasing magnetic fields from 0 to 0.6 T. Ore and reduced fractions as a function of the magnetic field were characterized by means of DSC/TGA, XRF, XRD, and SEM/EDS, determining Fe–Ni contents and crystallographic species. Thermodynamic calculations were used to predict the melting behavior in further smelting process. The results show that SR-MS is able to concentrate Ni from less than 1% in the ore to almost 4% in the calcine. Carbon-based reduction can be adjusted to improve chemical reduction, diminishing CO2e emissions from 138.82 to 34 kg CO2/kg Ni. Further positive impact on energy consumption in the electric arc furnace is expected due to a lower material charge as a result of the Ni concentration.

Graphical abstract