METHOD OF EXTRACTING RHENIUM AND MOLYBDENUM BY LIQUID EXTRACTION WITH SECONDARY AMINES Russian patent published in 1998 - IPC

FIELD: chemical technology. SUBSTANCE: extracting rhenium and molybdenum by liquid extraction with the help of secondary amines of sulfate solutions is followed by ammonium reextraction. Amine extract before reextraction is treated with weak ammonia solutions till pH of aqueous phase at output is 1.5-2.5. 5 % solution of ammonia water is used as said weak ammonia solution, ratio of aqueous and organic phases being 1:20. EFFECT: accumulation of ferrum in organic phase during its recirculation is prevented; organic phase is purified against sulfate ions being accompanied with presence of rhenium and molybdenum. 2 cl, 3 tbl