Ultrasound-Assisted Leaching of Vanadium and Yttrium from Coal Ash: Optimization, Kinetic and Thermodynamic Study,Chemical Engineering & Technology

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Ultrasound-Assisted Leaching of Vanadium and Yttrium from Coal Ash: Optimization, Kinetic and Thermodynamic Study
Chemical Engineering & Technology ( IF 1.8 ) Pub Date : 2021-09-24 , DOI: 10.1002/ceat.202100297
Hero Ghasemi Masoum ₁ , Seyed Omid Rastegar ₁ , Mehrdad Khamforoush ₁

Affiliation

Vanadium (V) and yttrium (Y) were extracted from coal fly ash by a leaching process utilizing sulfuric acid with assistance of ultrasonic and hydrogen peroxide. Response surface methodology was applied to optimize main factors including solid-to-liquid (S/L) ratio, H₂SO₄ percentage, and H₂O₂ percentage. Under optimal conditions recovery rates for V and Y were 100 % and 97 %, respectively. A modified shrinking core model to study the kinetic leaching showed that the mass diffusion step controlled the reaction rate. The enthalpies for V and Y recovery indicated that the process was endothermic. Gibbs energy for both metals was negative, i.e., the process was spontaneous. Field emission scanning electron microscopy was applied to determine the effects of acid concentration and ultrasound on the surface of coal fly ash. Results demonstrated that the leaching agent could degrade and diffuse to coal ash particles.

中文翻译：

粉煤灰中钒和钇的超声辅助浸出：优化、动力学和热力学研究

钒 (V) 和钇 (Y) 是通过在超声波和过氧化氢的辅助下利用硫酸的浸出工艺从粉煤灰中提取的。应用响应面方法优化主要因素，包括固液 (S/L) 比、H ₂ SO ₄百分比和 H ₂ O ₂百分比。在最佳条件下，V 和 Y 的回收率分别为 100% 和 97%。用于研究动力学浸出的改进的收缩核心模型表明，质量扩散步骤控制了反应速率。V 和 Y 的回收焓表明该过程是吸热的。两种金属的吉布斯能量都是负的，即该过程是自发的。应用场发射扫描电子显微镜来确定酸浓度和超声波对粉煤灰表面的影响。结果表明浸出剂可以降解并扩散为煤灰颗粒。

更新日期：2021-11-18

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