Development of Complex Leaching Technology of Rare-Earth Metals from Coal Ash

Abstract

The experimental data on leaching rare-earth metals from coal ash; which point to the necessity of complex processing of coal ash including the treatment of milled
ash wastes by the solution of mineral acid, for example, sulfuric acid, and additional treatment of these wastes by a cultural liquid, which contains thionic bacteria
and main elements of the nutrient medium for their cultivation; are presented. This method provides a rather complete recovery of rare-earth metals from coal ash.
These experimental data served as a basis for the development of complex recovery technology of rare-earth metals from coal ash including both chemical and
biological treatment.