METHOD OF RHENIUM EXTRACTION FROM ACID LIQUOR Russian patent published in 2008 - IPC C22B61/00 C22B3/26 

FIELD: metallurgy.

SUBSTANCE: invention relates to hydrometallurgy of rare elements and can be used for selective extraction of rhenium from sulfuric, muriatic and composite acid sulphate- chloride solutions from leaching concentrate included rhenium and secondary raw materials. This method includes selective treatment of acid liquor contained rhenium (VII) by second aliphatic alcohols at support of equilibrium concentration in raffinate 4,5-7 mole/l. At the same time the main part of rhenium (VII) turns into extract and main part of acid turns into raffinate. For selective treatment it is used secondary aliphatic alcohols with value of carbon atom C₇-C₁₀, predominately heptanol-4, octanol-2, octanol-3, nonanol-4, decanol-5, technical compound of alcohol based on octanol-2. Second aliphatic alcohol additionally can contain 0.5-1.2 mole of mineral acid. Re-extraction of rhenium (VII) is implemented by ammonia water.

EFFECT: technical result is increasing of rhenium (VII) extraction ratio at an average at 5.8%, increasing of re-extraction purity by 2.9-14.8% because of reducing co-extraction of mineral acid and also reducing of reactant consumption by 5-10% while 2 times reducing of extraction operation duration.

10 cl, 1 tbl, 8 ex