Dissolution behavior and partitioning of rare earth elements in coal fly ash particles into dilute acids

粉煤灰颗粒中稀土元素在稀酸中的溶解行为和分配

• 批准号: 23760710
• 负责人: KASHIWAKURA Shunsuke
• 金额: $ 1.75万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23760710/
• 关键词: 廃棄物処理; レアアース; フライアッシュ; 資源回収

Recently, the worldwide supply of rare earth element (REE) resources will be severely restricted. On the other hand, coal fly ash particles emitted from coal-fired electric power plants contain relatively high concentrations of REEs. The contents of REEs in coal fly ash are regularly several hundreds of ppmw. In order to extract and recover REEs from coal fly ash particles, as a first step, we have investigated their dissolution behavior in a dilute H2SO4 solvent. The REE content of coal fly ash specimens has been precisely determined, and their presence in the ash component of the original coal and their enrichment in coal fly ash particles during coal combustion have been suggested. REEs in coal fly ash dissolve gradually in H2SO4 over time, and this implies two types of occurrences of the REEs in coal fly ash particles. By applying the unreacted core model to the dissolution behavior of REEs in a H2SO4 solvent, we can explain both types of occurrences.

近年来，全球稀土资源的供应将受到严重限制。另一方面，燃煤发电厂排放的粉煤灰颗粒含有相对高浓度的稀土元素。粉煤灰中稀土元素的含量一般在几百ppmw左右。为了从粉煤灰颗粒中提取和回收稀土元素，作为第一步，我们研究了它们在稀硫酸溶剂中的溶解行为。对煤飞灰样品的稀土元素含量进行了精确测定，并提出了它们在原煤灰分中的存在和在煤燃烧过程中在飞灰颗粒中的富集。粉煤灰中的稀土元素在硫酸溶液中的溶解度随时间的延长而逐渐降低，说明粉煤灰中稀土元素存在两种赋存状态。通过将未反应核模型应用于稀土元素在硫酸溶剂中的溶解行为，我们可以解释这两种类型的发生。

项目成果

Precise determination of rare earth elements (REEs) for evaluation of recoveryrate by an extraction with a dilute acid

精确测定稀土元素 (REE)，以评估稀酸萃取的回收率

• 发表时间: 2012
• 作者: S. Kashiwakura;K. Wagatsuma
• 通讯作者: K. Wagatsuma

Precise determination of rare earth elements (REEs) for evaluation of recovery rate by an extraction with a dilute acid

精确测定稀土元素 (REE)，以评估稀酸萃取回收率

• 发表时间: 2012
• 作者: Shunsuke Kashiwakura;Kazuaki Wagatsuma
• 通讯作者: Kazuaki Wagatsuma

石炭フライアッシュ中のレアアースの希酸への溶出挙動

粉煤灰中稀土对稀酸的洗脱行为

• 发表时间: 2011
• 作者: S.A. Saad;Y. Morisada;R. Ueji;H. Fujii;柏倉俊介
• 通讯作者: 柏倉俊介

Recovery of rare-earth elements from coal fly ash particles generated from coal-fired electric power stations with the aid of Acid Washing Process

酸洗工艺从燃煤电厂飞灰颗粒中回收稀土元素

• 发表时间: 2011
• 作者: S. Kashiwakura;Y. Kumagai;K. Wagatsuma
• 通讯作者: K. Wagatsuma

石炭フライアッシュ中のレアアースの精密定量

煤粉煤灰中稀土的精密测定

• 发表时间: 2012
• 作者: 柏倉俊介;我妻和明
• 通讯作者: 我妻和明