METHOD OF PRODUCING ALUMINUM OXIDE AND CARBONATE FROM RICH AL MATERIALS WITH INTEGRATED COOPERATIVE CO DISPOSITION Russian patent published in 2019 - IPC C01F7/22 C22B3/10 C22B3/28 C01F7/56 C01B32/60 C01D7/16 C01D7/26 C01F11/18 C01F5/24 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. Method of producing aluminum oxide from aluminum-rich materials with integrated recycling of CO₂ includes grinding and leaching of rich Al materials in hydrochloric acid. Unreacted solid substance is separated from metal chloride solution. Separating Al³⁺ from said solution by crystallisation of AlCl₃⋅6H₂O. Obtaining Al₂O₃ by firing AlCl₃⋅6H₂O with extraction of HCl. Firing is performed in two stages: first by indirect heating at temperature from 400 to 600 °C for formation of HCl-rich gas, then at temperature higher than 600 °C to produce Al₂O₃. CO₂ utilization is carried out into precipitate of metal carbonates from metal chloride solution, coming from separation stage Al³⁺. HCl and extractive amine are regenerated. Aluminum-poor metal chloride solution is mixed with organic solution containing selected amine, and mixture is brought into contact with CO₂ gas for extraction of HCl by formation of complex of ammonium chloride salt and deposition of metal carbonate. Metal carbonate is separated. Thermally or chemically organic solution is treated in order to regenerate amine for recycling.

EFFECT: invention increases environmental safety when producing aluminum oxide from aluminum-rich silicate rocks.

14 cl, 4 dwg, 3 ex