Scholarlink

<p>The use of sintering to process chromite ore processing residue dominated by FeCr<sub>2</sub>O<sub>4</sub> significantly impacts the metallurgical properties of the sintered ore. This study investigates the mechanism of which FeCr<sub>2</sub>O<sub>4</sub> effects the formation of calcium ferrite bonding phases and the mechanical properties during sintering, combining micro-sintering experiments with first-principles calculations. The results show that FeCr<sub>2</sub>O<sub>4</sub> decomposes into Fe<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub> at high temperatures in air atmosphere. The resulting Cr<sub>2</sub>O<sub>3</sub> subsequently reacts with Fe<sub>2</sub>O<sub>3</sub> in the sintering specimen to form iron-chromium solid solution ((Fe<sub>1−<i>x</i></sub>Cr<sub><i>x</i></sub>)<sub>2</sub>O<sub>3</sub> (0&#xa0;≤&#xa0;<i>x</i>&#xa0;≤&#xa0;1)), which then reacts with CaO to produce chromium-containing calcium ferrite (CF). With FeCr<sub>2</sub>O<sub>4</sub> content increases from 1 to 5&#xa0;wt&#xa0;pct, the phase of sintered specimen is CF (containing Cr). Furthermore, the phases of sintered specimens are CF (containing Cr), Ca<sub>4</sub>Fe<sub>14</sub>O<sub>25</sub> (containing Cr), and (Fe<sub>1−<i>x</i></sub>Cr<sub><i>x</i></sub>)<sub>2</sub>O<sub>3</sub> (0&#xa0;≤&#xa0;<i>x</i>&#xa0;≤&#xa0;1) when the FeCr<sub>2</sub>O<sub>4</sub> content is 5–10&#xa0;wt&#xa0;pct. Each of the iron-containing phases contains chromium with the addition of FeCr<sub>2</sub>O<sub>4</sub>. The substitution of Cr atom for Fe atom in the CF crystals enhanced both the hardness and toughness of the crystal structure. With FeCr<sub>2</sub>O<sub>4</sub> content increases from 0 to 5&#xa0;wt&#xa0;pct, the CF microhardness increases from 682. 51 HV0.1 to 918.22 HV0.1. When the FeCr<sub>2</sub>O<sub>4</sub> content increases from 5 to 10&#xa0;wt&#xa0;pct, the CF microhardness decreases from 918.22 HV0.1 to 759.09 HV0.1.</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

Effect of FeCr2O4 on the Formation and Mechanical Properties of Calcium Ferrite in Sintering Process

  • 期刊论文

  • 发表日期：

    2025年12月17日

查看全文
  • Ju Xu,
  • Guojun Ma,
  • Robert Cromarty,
  • Xiang Zhang,
  • Dingli Zheng,
  • Mingming Song,
  • Johannes Schenk

摘要

The use of sintering to process chromite ore processing residue dominated by FeCr2O4 significantly impacts the metallurgical properties of the sintered ore. This study investigates the mechanism of which FeCr2O4 effects the formation of calcium ferrite bonding phases and the mechanical properties during sintering, combining micro-sintering experiments with first-principles calculations. The results show that FeCr2O4 decomposes into Fe2O3 and Cr2O3 at high temperatures in air atmosphere. The resulting Cr2O3 subsequently reacts with Fe2O3 in the sintering specimen to form iron-chromium solid solution ((Fe1−xCrx)2O3 (0 ≤ x ≤ 1)), which then reacts with CaO to produce chromium-containing calcium ferrite (CF). With FeCr2O4 content increases from 1 to 5 wt pct, the phase of sintered specimen is CF (containing Cr). Furthermore, the phases of sintered specimens are CF (containing Cr), Ca4Fe14O25 (containing Cr), and (Fe1−xCrx)2O3 (0 ≤ x ≤ 1) when the FeCr2O4 content is 5–10 wt pct. Each of the iron-containing phases contains chromium with the addition of FeCr2O4. The substitution of Cr atom for Fe atom in the CF crystals enhanced both the hardness and toughness of the crystal structure. With FeCr2O4 content increases from 0 to 5 wt pct, the CF microhardness increases from 682. 51 HV0.1 to 918.22 HV0.1. When the FeCr2O4 content increases from 5 to 10 wt pct, the CF microhardness decreases from 918.22 HV0.1 to 759.09 HV0.1.