METHOD OF POWDER-LIKE METALLIC RHENIUM PREPARING Russian patent published in 1994 - IPC

FIELD: rare metal production. SUBSTANCE: method involves the reduction of ammonium perrhenate containing 0.35-4.0 wt.-% powder-like metallic rhenium with vapors of organic substance taken from the following group: alcohol of the general formula R₁CH₂OH, alkylamine of the general formula R₁NH₂, dialkylamine of the general formula R₁R₂NH, trialkylamine of the general formula R₁R₂R₃N, aldehyde of the general formula R₁CHO, amide of the general formula R₁CONH₂, hydrocarbon of the general formula C_pH_2p+2, dimethylamide of the general formula R₁CON(CH₃)₂, diamide of the general formula NH₂COR₄CONH₂ or polyvinylbutyral, where R₁, R₂, R₃ = CH_2H+1, R₄=C_nH_2n at n = 1-10, p = 5-14, or with the mixtures of indicated substances for 5-30 min following increase of temperature up to 400-500 C, complete reduction and the following treatment of prepared powder with steam at 200-600 C for 0.5-5 h at the mole ratio initial ammonium perrhenate:water = 1:(0.1-100). Absolute initial charge thickness is 0.2-3 cm. The yield of product is retained at the level 99.2-99.9%, density of ready small bars of rhenium is increased up to 87-88%, caking temperature is decreased by 200 C. EFFECT: enhanced quality of product. 3 tbl