Scholarlink

<p>This study addresses a detailed hydrometallurgical and kinetic investigation of stibnite (Sb<sub>2</sub>S<sub>3</sub>) dissolution in alkaline media composed of sodium sulfide (Na₂S) and sodium hydroxide (NaOH). The effects of leaching parameters—including leachant concentration, temperature, particle size, and solid-to-liquid ratio—were completely evaluated. Kinetic analysis illustrated that the dissolution process complies with shrinking core model with ash layer diffusion as the rate-controlling step. SEM and XRF characterization confirmed the presence of a silica-rich product layer on the particle surface, supporting the main diffusion mechanism. The activation energy of 18.13&#xa0;kJ/mol was calculated, consistent with diffusion-controlled reactions. Also, a Na₂S/NaOH molar ratio of 0.75/0.75 yielded a maximum antimony recovery of 98%, significantly outperforming last reported systems. The validity of the kinetic model was checked out using the Bischoff model under pseudo-steady-state conditions. These results not only clarified the kinetic mechanism of stibnite dissolution in alkaline media but also propose practical understanding for increasing process efficiency in antimony extraction.&#xa0;</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

Kinetic Investigation of Dissolution of Sb2S3 in Na2S and NaOH Alkaline Media

  • 期刊论文

  • 发表日期：

    2025年9月25日

查看全文
  • Milad Rahimian,
  • Eskandar Keshavarz Alamdari,
  • Sadegh Firoozi

摘要

This study addresses a detailed hydrometallurgical and kinetic investigation of stibnite (Sb2S3) dissolution in alkaline media composed of sodium sulfide (Na₂S) and sodium hydroxide (NaOH). The effects of leaching parameters—including leachant concentration, temperature, particle size, and solid-to-liquid ratio—were completely evaluated. Kinetic analysis illustrated that the dissolution process complies with shrinking core model with ash layer diffusion as the rate-controlling step. SEM and XRF characterization confirmed the presence of a silica-rich product layer on the particle surface, supporting the main diffusion mechanism. The activation energy of 18.13 kJ/mol was calculated, consistent with diffusion-controlled reactions. Also, a Na₂S/NaOH molar ratio of 0.75/0.75 yielded a maximum antimony recovery of 98%, significantly outperforming last reported systems. The validity of the kinetic model was checked out using the Bischoff model under pseudo-steady-state conditions. These results not only clarified the kinetic mechanism of stibnite dissolution in alkaline media but also propose practical understanding for increasing process efficiency in antimony extraction.