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Recovery of Rhenium.

Bauer-DJ; Fischer-DD; Lindstrom-RE
U S Pat 3 862 292 1975 Jan; :
Rhenium is recovered from dusts and fumes collected in molybdenite roasting by leaching and adsorption with activated carbon. Further recovery from the carbon is accomplished by elution with a water- soluble alcohol or a water-alcohol mixture, if molybdate is first eluted with brine. The c is later regenerated for reuse by washing with water. A suitable brine for removing mo consists of 150-350 g nacl or nacl+na2so4/l. To elute the re the alcohol can contain up to 50 pct water. The eluate can be boiled down to crystallize the perrhenate, or the latter can be extracted with a Tertiary amine, stripped with nh4oh, and the ammonium perrhenate reduced by h2 to re. When re was adsorbed in a column of activated carbon from an aqueous solution at ph 8.5 Containing 1 g re/l and 10 g mo/l, and the mo was washed out completely with 25 pct nacl solution, the c was contacted with 4 bed volumes of methyl alcohol containing 25 pct h2o to recover 97 pct of the re in the solution. The c was washed with water and used for 20 more cycles.
Publication Date
Document Type
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
PAT 3,862,292
NIOSH Division
Source Name
U.S. Pat. 3,862,292; Jan. 21, 1975; Chem. Abstr. 82:127,114P, 81:94,464B