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

作者：Zhonggen Li,Xinyu Li,Leiming Zhang,Shan Li,Ji Chen,Xinbin Feng,Dongbo Zhao,Qingfeng Wang,Zhixi Gao,Bailian Xiong

摘要：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(Cout1)are in the range of 0.89-1.11.This study indicates a promising prospect to reclaim REY from REYrich CCPs(bottom and fly ash)in CFPPs in Guizhou,especially in the central-north Guizhou,although such practices require further technology advancement.

发文机构：College of Resources and Environment State Key Laboratory of Environmental Geochemistry University of Chinese Academy of Sciences Air Quality Research Division College of Chemical Engineering

关键词：REYBottomashFlyashAtmosphericemissionsRECLAMATIONRareearths

分类号： TG1[金属学及工艺—金属学]