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<p>The extraction of indium from secondary resources of indium-containing solid waste has gained significant attention in recent years. This study focuses on the investigation of a typical indium-bearing zinc ferrite derived from indium-containing solid waste. The effects of CaO, reduction time, and reduction temperature on the volatilization of indium and zinc were examined. The volatilization behavior and morphological changes of indium and zinc were characterized using XRF, XRD, and SEM-EDS. The results showed that the addition of CaO inhibits the formation of the intermediate Fe<sub>0.85-x</sub>Zn<sub>x</sub>O and promotes the volatilization of zinc and indium. When indium-bearing zinc ferrite was subjected to reduction in the presence of CaO at 1100°C for 30&#xa0;min, the volatilities of zinc and indium reached 95.75% and 86.08% respectively. It was observed that there existed a strong linear correlation between the volatilities of zinc and indium. The volatilization model for indium from a first-order chemical reaction model (without CaO) to a three-dimensional diffusion model (with CaO), resulting in a significant reduction in the apparent activation energy from 361.87&#xa0;kJ&#xa0;mol<sup>− 1</sup> to 63.37&#xa0;kJ&#xa0;mol<sup>− 1</sup>. The CaO facilitates the enrichment of volatile elements and creates favorable conditions for the volatilization of zinc and indium.</p>

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Effect of Calcium Oxide on the Kinetics and Mechanism of Carbon Reduction of Indium-Containing Zinc Ferrite

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Wei-an Wang,
  • Xin-hua Zhang,
  • Guo-hua Wang,
  • Yong-kun Yang,
  • Guo-xing Qiu,
  • Xiao-ming Li

摘要

The extraction of indium from secondary resources of indium-containing solid waste has gained significant attention in recent years. This study focuses on the investigation of a typical indium-bearing zinc ferrite derived from indium-containing solid waste. The effects of CaO, reduction time, and reduction temperature on the volatilization of indium and zinc were examined. The volatilization behavior and morphological changes of indium and zinc were characterized using XRF, XRD, and SEM-EDS. The results showed that the addition of CaO inhibits the formation of the intermediate Fe0.85-xZnxO and promotes the volatilization of zinc and indium. When indium-bearing zinc ferrite was subjected to reduction in the presence of CaO at 1100°C for 30 min, the volatilities of zinc and indium reached 95.75% and 86.08% respectively. It was observed that there existed a strong linear correlation between the volatilities of zinc and indium. The volatilization model for indium from a first-order chemical reaction model (without CaO) to a three-dimensional diffusion model (with CaO), resulting in a significant reduction in the apparent activation energy from 361.87 kJ mol− 1 to 63.37 kJ mol− 1. The CaO facilitates the enrichment of volatile elements and creates favorable conditions for the volatilization of zinc and indium.