METHOD OF PROCESSING ALUMINUM ALUM Russian patent published in 2019 - IPC C01F7/30 C01F7/76 

FIELD: chemistry.

SUBSTANCE: invention relates to the field of chemical technology and can be used to obtain γ-aluminium oxide used in the manufacture of catalysts, sorbents, desiccants, etc. Aluminum potassium or ammonia alum is treated with gaseous ammonia, the ammonization product is leached with water, a hydrated precipitate is separated from the resulting suspension, which is treated with a solution of ammonium carbonate or ammonium bicarbonate containing 2–4 mol/l [NH₄]⁺. Processing hydrated sediment is carried out at W:T=10–20:1 and a temperature of 105–125 °C for 6–30 hours. Resulting aluminum-containing precipitate is separated, washed with water and dried. After drying, the aluminum-containing precipitate is calcined at a temperature of 500–600 °C for 1–4 hours to obtain γ-aluminum oxide.

EFFECT: method allows to get γ-aluminium oxide with a content of impurity alkaline elements reduced to 0,004 % and up to 0,003 % of sulfur trioxide impurity, as well as an increased specific surface area of up to 430 m²/g and increased to 0,81 cm³/g porosity of particles.

5 cl, 5 ex