METHOD FOR SEPARATION OF COMPONENTS CONTAINED THEREIN FROM ASH Russian patent published in 2020 - IPC C22B7/00 C01F7/02 C01B33/113 C01G49/08 B09B3/00 

FIELD: technological processes.

SUBSTANCE: invention relates to extraction of organic fuel (coal black or brown, peat, lignite, oil shale, wood, animal wastes, poultry farming, agriculture), components of SiO₂, Al₂O₃ contained therein from ash, Fe₂O₃, and so forth. Method involves mixing ash with ammonium fluoride, heating the mixture and holding it. Obtained mixture is mixed with water to form a suspension which is filtered to obtain a solution of ammonium hexafluorosilicate (NH₄)₂ SiF₆ and an undissolved residue. (NH₄)₂ SiF₆ solution is treated with ammonia water to obtain a precipitate of SiO₂ and ammonium fluoride solution directed for regeneration. Insoluble residue is mixed with water to obtain a suspension which is filtered to obtain a filtrate - ammonium hexafluoroaluminate (NH₄)₃ AlF₆ solution and ammonium hexafluorferrate (NH₄)₃ FeF₆ and an undissolved residue. Obtained filtrate is treated with ammonium water to obtain a precipitate - a mixture of Al(OH)₃ and Fe(OH)₃ hydroxides and ammonium fluoride solution. Mixture of hydroxides is separated from ammonium fluoride solution directed for regeneration. Mixture of hydroxides is treated with an aqueous solution of hydrazine to obtain a suspension consisting of Al(OH)₃, water and precipitate Fe₃O₄, which is separated from Al(OH)₃ by magnetic separation.

EFFECT: method reduces number of technological operations with elimination of formation of a by-product - ammonium sulphate.

1 cl, 1 ex