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Metals 2016, 6(11), 282; doi:10.3390/met6110282

Separation of Rhenium from Lead-Rich Molybdenite Concentrate via Hydrochloric Acid Leaching Followed by Oxidative Roasting

School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China
These authors contributed equally to this work.
Authors to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 12 October 2016 / Revised: 1 November 2016 / Accepted: 13 November 2016 / Published: 16 November 2016
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Lead-rich molybdenite is a typical rhenium-bearing molybdenum resource in China, which has not been efficiently utilized due to its high contents of lead and gangue minerals. In this study, hydrochloric acid was used for preliminarily removing lead and calcite from a lead-rich molybdenite concentrate. Oxidative roasting-ammonia leaching was then carried out for separation of rhenium and extraction of molybdenum. The hydrochloric acid leaching experiments revealed that 93.6% Pb and 97.4% Ca were removed when the leaching was performed at 95 °C for 10 min with HCl concentration of 8 wt. % and liquid-solid ratio of 5 (mL/g). The results of direct oxidative roasting indicated that 89.3% rhenium was volatilized from the raw concentrate after roasting at 600 °C for 120 min in air. In contrast, the rhenium volatilization was enhanced distinctly to 98.0% after the acid-leached concentrate (leaching residue) was roasted at 550 °C for 100 min. By the subsequent ammonia leaching, 91.5% molybdenum was leached out from the calcine produced from oxidative roasting of the acid-leached concentrate, while only 79.3% Mo was leached from the calcine produced by roasting molybdenite concentrate without pretreatment. View Full-Text
Keywords: molybdenite concentrate; rhenium; lead; oxidative roasting; acid leaching molybdenite concentrate; rhenium; lead; oxidative roasting; acid leaching

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Li, G.; You, Z.; Sun, H.; Sun, R.; Peng, Z.; Zhang, Y.; Jiang, T. Separation of Rhenium from Lead-Rich Molybdenite Concentrate via Hydrochloric Acid Leaching Followed by Oxidative Roasting. Metals 2016, 6, 282.

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