Partitioning of rare earth elements and yttrium (REY) in five coal-fired power plants in Guizhou, Southwest China,Journal of Rare Earths

当前位置： X-MOL 学术 › J. Rare Earths › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Partitioning of rare earth elements and yttrium (REY) in five coal-fired power plants in Guizhou, Southwest China
Journal of Rare Earths ( IF 5.2 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.jre.2019.12.013
Zhonggen Li , Xinyu Li , Leiming Zhang , Shan Li , Ji Chen , Xinbin Feng , Dongbo Zhao , Qingfeng Wang , Zhixi Gao , Bailian Xiong

Abstract As indispensable strategic materials for high-tech industries, rare earth elements and yttrium (REY) have become particularly important in recent years, raising the demand of developing new approaches for reclamation of REY from REY-rich materials such as coal combustion products (CCPs). In this study, five coal-fired power plants (CFPPs) in Guizhou of southwest China were selected for investigating REY concentrations of solid samples, atmospheric emissions, and recovery potentials. REY concentrations of feed fuels are higher in this study (147.2–468.6 mg/kg) than what have been reported previously for coals in China and the world. REY atmospheric emissions are extremely low (38.70–180.11 mg REY/t coal). REY are enriched in bottom ash and fly ash, with average of 658 ± 296 mg/kg and maximum of 1257 mg/kg from the five CFPPs. Relative enrichment factors (REF) of REY in bottom ash and fly ash compared with the feed fuel are 0.86–1.02 and 0.91–1.04, respectively. REY concentrations in desulfurized gypsum are very low (6–17 mg/kg), and that is mostly inherited from limestone. Critical REY (Nd, Eu, Tb, Dy, Y, and Er) in bottom/fly ash account for 34%–39% of the total REY and the outlook coefficients (Coutl) are in the range of 0.89–1.11. This study indicates a promising prospect to reclaim REY from REY-rich CCPs (bottom and fly ash) in CFPPs in Guizhou, especially in the central-north Guizhou, although such practices require further technology advancement.

更新日期：2020-11-01

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11