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
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2022,（5）
• 所属期刊栏目: CHEMISTRY AND HYDROMETALLURGY
• 页码范围: 807-814
• 页数: 8页
• 语种: 英文

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 so-lutions.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.