Leaching of lanthanide and yttrium from a Central Appalachian coal and the ashes obtained at 550-950℃  

作　　者：Ronghong Lin Yee Soong Bret H.Howard Murphy J.Keller Elliot A.Roth Ping Wang Evan J.Granite 

机构地区：[1]U.S.Department of Energy,National Energy Technology Laboratory,626 Cochrans Mill Road,P.O.Box 10940,Pittsburgh,PA,15236,United States [2]Keylogic Systems.Pittsburgh,PA,15236,United States

出　　处：《Journal of Rare Earths》2022年第5期807-814,I0005,共9页稀土学报（英文版）

基　　金：Project supported by the U.S.Department of Energy(DOE)National Energy Technology Laboratory(NETL)Research and Innovation Center(R&IC)Rare Earth FWP;supported in part by appointment(R.H.Lin)to the NETL Research Participation Program;sponsored by the U.S.DOE;administered by the Oak Ridge Institute for Science and Education(ORISE)。

摘　　要：In this work,we investigated leaching of lanthanide and yttrium(REY) from a Central Appalachian coal and its ashes obtained at 550-950℃ with the main purpose of understanding the impact of ashing temperature on REY leachability in water,ammonium sulfate,and hydrochloric acid.It is found that the coal contains a negligible amount of water-soluble REY,less than 1% ion-exchangeable REY,and about 28% of HCl-soluble REY.Ashing leads to dramatic changes in REY leachability in both ammonium sulfate and hydrochloric acid solutions,which is believed to be related to transformation and redistribution of organically-associated REY in coal during the ashing process.Ashing temperature significantly affects REY leaching from coal ashes;higher ashing temperature results in lower REY leachability in both solutions.Clay minerals may play a significant role in changing the leachability of REY after ashing.In addition,the results also suggest that the organic matter in the coal is relatively enriched in heavy REY.

关 键 词：Acid leaching Cation exchange COAL Coal ash Rare earth elements YTTRIUM 

分 类 号：TF845[冶金工程—有色金属冶金]