Assessment of the Possibility to Open Up Coal Waste by Sintering With Sodium Carbonate

Waste from coal processing and coal preparation has great potential because it contains valuable elements such as rare and rare earth elements.The low content and complex composition of waste requires the use of complex processing, which, by extracting several valuable products, will make processing economically viable.The initial stage of enrichment requires the opening of the waste, during which stubborn minerals pass into a soluble form, which, with subsequent leaching, allows the valuable components to be completely transferred into solution.One of the ways to open chemically resistant raw materials is sintering with sodium carbonate, which formed the basis of this study.The article presents the results of the distribution of matrix and some rare elements during leaching with sulfuric acid (various concentrations) of raw materials obtained by sintering coal preparation waste and sodium carbonate.It has been established that during leaching, most of the silicon oxide precipitates (up to 47% wt. in terms of Si).When leaching 10% wt. with sulfuric acid, titanium compounds precipitate in all samples, which gives the prospect of its subsequent extraction from the residue.