Colorimetric Determination of Rhenium

Review of rhenium extraction and recycling technologies from primary and secondary resources

“…It includes molybdenum roasting at about 600-650 °C, copper smelting process at ~1200-1300 °C and lead (galena) roasting process at ~900-1000 °C. The early literature is available in a patent by Melaven and Bacon (1947) for the pyrometallurgical processes to extract rhenium, since then the technologies have been developed to increase the efficiency and accommodate the different Re-containing concentrates. A conceptual flowsheet is shown in Fig.…”

Spectrometric Determination of Rhenium and Its Separation from Molybdenum

“…Separations of molybdenum from rhenium by a-benzoinoxime precipitation of the molybdenum (12), the distillation of perrhenic acid (6), the selective reduction of molybdenum and its extraction in the presence of thiocyanate ( 9), acid sulfide concentration of the rhenium (5), chloroform extraction of tetraphenylarsonium perrhenate (15), ether extraction of molybdenum with ethyl xanthate (11), and other methods (2, 18, 14) have been advocated. Each of these techniques has its own particular merits and limitations, but most of these procedures are tedious; some are limited to low ratios of molybdenum to rhenium, and some introduce reagents which would be incompatible with suitable measuring steps.…”

“…THE ever-increasing applicability of zirconium and its compounds has led to the recent development of a number of methods for its determination. Most of the investigations have been concerned with organic precipitants such as mandelic acid and its halo-derivatives (6,11,12). These reagents are decidedly superior to phosphate (7) and cupferron (8) as quantitative precipitants.…”

Review: Rhenium and its smelting and recycling technologies

“…Arthur D. Melaven and John A. Bacon at Tennessee State University succeeded in producing Re from the flue dust generated during the roasting of MoS 2 . 74 In their method, the Re contained in the flue dust of MoS 2 was leached as perrhenic acid (HReO 4 ), which was followed by the addition of KCl to precipitate KPR, after which the KPR was purified by repeated recrystallization (reaction (3)). Re metal was obtained by H 2 reduction of the precipitated KPR (reaction (4)). When Re is produced from KReO 4 , a small amount of K remains in the Re metal obtained after the H 2 reduction.…”