Open AccessSupercritical solvent extraction of lignite combustion products by water and HNO3 – Rare Earth Elements recovery study
Author(s) -
W. Urbańczyk,
Marcin Lutyński
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/641/1/012007
Subject(s) - supercritical fluid , extraction (chemistry) , coal , rare earth , fly ash , solvent , supercritical fluid extraction , waste management , combustion , solvent extraction , coal combustion products , environmental science , slag (welding) , environmental chemistry , chemistry , materials science , metallurgy , chromatography , organic chemistry , engineering
Coal Combustion Products (CCPs) are anthropogenic materials generated during coal burning in coal-fired power plants and in case of lignite majority of these materials is disposed on land. CCPs contain various metals including Rare Earth Elements (REE). The purpose of this study was to assess if supercritical solvent extraction of CCPs, i.e. fly ash and bottom slag is effective to recover Rare Earth Elements. For that purpose two methods were compared: atmospheric and supercritical solvent extraction with the use of water and 10% HNO 3 . Result show that extraction of REE is unjustified when considering efficiency of solvent extraction process and obtained REE concentrations.