METHOD FOR EXTRACTION OF PRECIOUS COMPONENTS OUT OF COAL ASHES AND SLAGS Russian patent published in 2009 - IPC C22B7/00 C22B1/02 C22B3/04 

FIELD: technological processes.

SUBSTANCE: invention is related to method for extraction of precious components out of coal ashes and slags. Method includes mixing of initial raw materials with reagent, mixture heating, water leaching and extraction of components out of solutions. Reagent used in mixing is ammonium fluoride, ammonium hydrodifluoride or their mixture. Mixture heating is done at temperature from 130°C to 240°C for hydrofluoridation. From heated fluoridated mass fluoride volatile compounds are extracted at temperature of 320-600°C with their further desublimation on surface, temperature of which is 100-270°C, and separation by pyrohydrolysis method by desublimate treatment with water vapors. Residue after hydrofluoridation and sublimation separation is exposed to water leaching. Insoluble residue after water leaching is exposed to sulfuric acid leaching, with further filtration separation of insoluble sulfates. Extraction of components from solutions of sulfuric acid and water leaching is realised by method of ammonium hydrolysis.

EFFECT: possibility to separate ash and slag into individual components.

3 ex, 1 dwg