METHOD OF OBTAINING HIGH PURITY CORUNDUM Russian patent published in 2014 - IPC C01F7/42 C01F7/44 C01F7/46 

FIELD: chemistry.

SUBSTANCE: method of corundum obtaining includes water preparation and regulated dosing of water and aluminium into mixer, heating of high pressure reactor to temperature 200-400°C, regulated supply of powder-like aluminium suspension in water from mixer by means of regulated high pressure pump into high pressure reactor, spraying suspension in reactor by means of spray nozzles, separation of steam-water mixture from boehmite, accumulation and drying of boehmite, with boehmite being additionally separated, after which it is supplied into heat chamber, where it is dried in the range of temperatures from 50 to 200°C for 1-5 h, after which it is supplied into muffle furnace, where crystallisation water is extracted from it in the range of temperatures from 400 to 1200°C for 3-10 h, and product formed in muffle furnace is then charged into vacuum furnace with further thermal processing in the range of temperatures 900-1900°C for 3-8 h.

EFFECT: obtaining corundum of high chemical purity.

1 dwg, 1 tbl, 2 ex