Add time:07/28/2019         Source:sciencedirect.com

Rhenium, in the form of ammonium perrhenate was recovered from Sarcheshmeh molybdenite concentrates by roasting the concentrates with slaked lime. The effect of the roasting parameters, such as roasting temperature, roasting materials and gas composition was investigated. The roasted materials were leached with water in order to separate the water-soluble calcium perrhenate and the water-insoluble compounds, calcium molybdate and calcium sulfate, that were formed during roasting. Impure rhenium-bearing solution was passed through a column of strong anionic quaternary resin (Dow IRA 410) for selective absorption of rhenium ions from the solution. Stripping of the column was carried out with hypochloric acid. The resultant perrhenic acid solution was exposed to hydrogen sulfide gas in order to precipitate rhenium heptasulfide. To produce ammonium perrhenate, the sulfide was decomposed by ammonia in the presence of hydrogen peroxide. The solution was evaporated and ammonium perrhenate crystals were formed.

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