a way to obtain the spherical form of aluminium oxide

摘要

1. method of obtaining aluminum oxide spherical form, including the processing of aluminum hydroxide with humidity 73 - 75 mas.% nitric acid, molding the granules by passage through a column with water solution of ammonia from the top down, the transport of grain drying, drying them and u043fu0440u043eu043au0430u043b u0438u0432u0430u043du0438u0435, a fact that, in order to reduce the reagent consumption and improve the environment process, the molding has a granule diameter of 0.1 to 3.0 mm.the concentration of ammonia in the solution u0444u043eu0440u043cu043eu0432u0430u043du0438u0438 reduced from 18 to 21% at the top of the column to 2% - 5% down column, and transport of granules to u0441u0443u0448u0438u043bu044cu043du043eu043cu0443 aggregate exercise in u0434u043eu0439.2. method for 1, which, upon receipt of the granules with a diameter of 2 - 3 mm concentration solution of ammonia reduced from 18 to 21% up to 3% - 5% down u043au043eu043bu043eu043du043du044b.3. method for p.1, a fact that in obtaining the granule diameter of 1.9 1.3 mm of aluminium hydroxide by acid to acid of 0.06 - 0.07 mol / mol AlO and u043au043eu043du0446u0435u043du0442 the solution of ammonia reduced from 15 - 17%, up to 3% - 5% down u043au043eu043bu043eu043du043du044b.4. method for p.1, a, to obtain granules with a diameter of 0.1 to 1.2 mm u043au0438u0441u043bu043eu0442u043du0443u044e processing aluminium hydroxide have to acid of 0.05 0.06 mol / mol AlO and u043au043eu043du0446u0435u043d u0442u0440u0430u0446u0438u044e solution ammonia reduces from 12 to 14% up to 2% - 4% below the columns.