PROCEDURE FOR HYDRO-METALLURGICAL TREATMENT OF RHENIUM CONTAINING MOLYBDENUM CONCENTRATE Russian patent published in 2010 - IPC C22B34/34 C22B61/00 C22B3/06 C22B3/24 

FIELD: metallurgy.

SUBSTANCE: procedure for hydro-metallurgical treatment of rhenium containing molybdenite concentrate consists in rhenium and molybdenum autoclave leaching with solution of nitric acid and in producing solution containing nitric and sulphuric acids. Further, residue in form of molybdenum acid is filtered and washed; molybdenum acid is dissolved in ammonia water and molybdenum and rhenium are extracted. Upon autoclave leaching rhenium is extracted from solution by sorption in two stages. At each stage duration of phase contact is 22-24 hours. Summary concentration of sulphuric and nitric acids at the first stage is maintained at ≤120 g/l and pH value at the second stage is maintained at 2-4. Molybdenum is extracted from a merged solution produced from the solution after sorption extraction of rhenium and from ammonia solution of dissolved molybdenum acid. Molybdenum is extracted by sorption in two stages at duration of phase contact 22-24 hours and maintaining pH value=1.5-2.0 at the first stage and pH=2.5-4.0 at the second stage.

EFFECT: increased output of molybdenum and rhenium into finish products, their high quality, simplification of process and its raised efficiency.

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